Positioning assembly

Abstract

This application relates to a positioning assembly for mounting a vehicle body to a car seat, comprising: a first positioning assembly having a first sliding member and a second sliding member; and a second positioning assembly having a first track and a second track. The first track extends along a first direction or a third direction. The second track extends along a second direction or a fourth direction. The first track and the second track intersect and form an intersection center. When the first positioning assembly is oriented relative to the second positioning assembly in the first direction, the first sliding member is located at the intersection center, and the second sliding member is located on one side of the first sliding member along the first direction.

Description

Positioning components This application relates to the field of infant and toddler products technology, and in particular to a positioning component. A child safety seat, also known as a Child Restraint System (CRS), is a seat specifically designed for children and installed inside vehicles such as cars to effectively improve children's safety. Typically, a child safety seat consists of a base and a carrier body mounted on the base. The carrier body can rotate relative to the base to face different directions, and the positioning components can slide relative to the base to move in different directions. However, in currently common car child safety seats, the rotation and sliding of the carrier body relative to the base are achieved through different mechanical structures. This results in a relatively complex structure for the base and the overall child safety seat, making operation inconvenient. Therefore, it is necessary to provide a vehicle and positioning component to address the above problems. The positioning component has a simple structure and can realize the function of rotating and sliding the vehicle body relative to it. This application provides a positioning assembly for mounting a vehicle body to a car seat, comprising: a first positioning assembly for connecting the vehicle body; and a second positioning assembly for connecting the car seat, wherein one of the first positioning assembly and the second positioning assembly is provided with a first track and a second track, and the other is provided with a first slider and a second slider; the first slider slides along one of the first track or the second track, and the second slider slides along the other of the first track or the second track, so that the first positioning assembly can rotate and slide relative to the second positioning assembly. This application provides a positioning component for mounting a vehicle body to a car seat, comprising: a first positioning component having a first sliding member and a second sliding member; and a second positioning component having a first track and a second track; wherein the first track extends along a first direction or a third direction, the second track extends along a second direction or a fourth direction, the first track and the second track are intersected and form an intersection center, and when the first positioning component is oriented relative to the second positioning component in the first direction, the first sliding member is located at the intersection center, and the second sliding member is located on one side of the first sliding member along the first direction. In one embodiment, the second positioning component is provided with the first track and the second track, and the first positioning component is provided with the first slider and the second slider; wherein, the first track extends along a first direction or a third direction, the second track extends along a second direction or a fourth direction, the first track and the second track are intersected and form an intersection center, and when the first positioning component is oriented relative to the second positioning component in the first direction, the first slider is located at the intersection center, and the second slider is located on the side of the first slider along the first direction. In one embodiment, the first slider slides along the second track, and the second slider slides along the first track; when the first positioning component is oriented relative to the second positioning component in the second direction or the fourth direction, the first positioning component retracts inward relative to the second positioning component in the second direction or the fourth direction. In one embodiment, the first track is divided by the intersection center to form a first track segment and a second track segment, and the second track is divided by the intersection center to form a third track segment and a fourth track segment; when the first positioning component is oriented relative to the second positioning component in the first direction, the first slider is located at the intersection center, and the second slider is located at the first track segment. In one embodiment, the first track segment extends from the intersection center toward the first direction, the second track segment extends from the intersection center toward the third direction; the third track segment extends from the intersection center toward the second direction, and the fourth track segment extends from the intersection center toward the fourth direction; the first direction and the third direction are parallel and opposite, the second direction and the fourth direction are parallel and opposite, and the first direction and the second direction intersect. In one embodiment, the first slider slides along the second track, and the second slider slides along the first track; when the first positioning component is oriented relative to the second positioning component in the second direction, the first slider is located in the fourth track segment, and the second slider is located at the intersection center; or when the first positioning component is oriented relative to the second positioning component in the fourth direction, the first slider is located in the third track segment, and the second slider is located at the intersection center. In one embodiment, the second positioning component is provided with the first track and the second track, and the first positioning component is provided with the first slider and the second slider; wherein, the first track extends along a first direction or a third direction, the second track extends along a second direction or a fourth direction, the first track and the second track are intersected and form an intersection center, and when the first positioning component is oriented relative to the second positioning component in the first direction, the first slider is located at the intersection center, and the second slider is located on the side of the first slider along the third direction. In one embodiment, the first slider slides along the second track, and the second slider slides along the first track; when the first positioning component is oriented relative to the second positioning component in the second direction or the fourth direction, the first positioning component is pulled outward relative to the second positioning component in the second direction or the fourth direction. In one embodiment, the first track is divided by the intersection center to form a first track segment and a second track segment, and the second track is divided by the intersection center to form a third track segment and a fourth track segment; when the first positioning component is oriented relative to the second positioning component in the first direction, the first slider is located at the intersection center, and the second slider is located in the second track segment. In one embodiment, the first slider slides along the second track, and the second slider slides along the first track; when the first positioning component is oriented relative to the second positioning component in the second direction, the first slider is located in the third track segment, and the second slider is located at the intersection center; or when the first positioning component is oriented relative to the second positioning component in the fourth direction, the first slider is located in the fourth track segment, and the second slider is located at the intersection center. In one embodiment, the first positioning component has a rotation axis, the first slider is coaxially disposed with the rotation axis, and the second slider is offset from the rotation axis. In one embodiment, the shape of the projection of the first positioning component onto the second positioning component is symmetrical about the rotation axis of the first positioning component; when the first positioning component is oriented relative to the second positioning component in the first direction, the position of the orthographic projection of the first positioning component onto the second positioning component is the same as the position of the orthographic projection of the first positioning component onto the second positioning component when the first positioning component is oriented relative to the second positioning component in the third direction. In one embodiment, the first positioning component has a first track and a second track, the second positioning component has a positioning axis, the second positioning component has a first slider and a second slider, and the first slider is coaxially arranged with the positioning axis, and the second slider is located on one side of the first slider along a second direction; wherein, the first track and the second track are intersected and form an intersection center, and when the first positioning component is oriented in a first direction relative to the second positioning component, the first slider is located at the intersection center, the second slider is located on the second track, and the first direction and the second direction are staggered. In one embodiment, the second track is divided by the intersection center to form a third track segment and a fourth track segment; when the first positioning component is oriented relative to the second positioning component in the first direction, the first slider is located at the intersection center, and the second slider is located in the third track segment. In one embodiment, the third track segment extends from the intersection center toward the second direction, and the fourth track segment extends from the intersection center toward the fourth direction; the second direction and the fourth direction are parallel and opposite. In one embodiment, the first slider slides along the first track, and the second slider slides along the second track; when the first positioning component is oriented in the second direction relative to the second positioning component, the first positioning component is pulled outward in the second direction relative to the second positioning component. In one embodiment, the first track is divided by the intersection center to form a first track segment and a second track segment, and the second track is divided by the intersection center to form a third track segment and a fourth track segment; when the first positioning component is oriented in the second direction relative to the second positioning component, the first slider is located in the second track segment, and the second slider is located at the intersection center. In one embodiment, when the first positioning component is oriented toward the second direction relative to the second positioning component, the first track segment extends from the intersection center toward the second direction, the second track segment extends from the intersection center toward the fourth direction; the third track segment extends from the intersection center toward the third direction, and the fourth track segment extends from the intersection center toward the first direction; the first direction and the third direction are parallel and opposite, and the second direction and the fourth direction are parallel and opposite. In one embodiment, the first slider slides along the first track, and the second slider slides along the second track; when the first positioning component is oriented in a fourth direction relative to the second positioning component, the first positioning component is recessed inward in the fourth direction relative to the second positioning component, the fourth direction being parallel to and opposite to the second direction. In one embodiment, the first track is divided by the intersection center to form a first track segment and a second track segment, and the second track is divided by the intersection center to form a third track segment and a fourth track segment; when the first positioning component is oriented relative to the second positioning component in the fourth direction, the first slider is located in the first track segment, and the second slider is located at the intersection center. In one embodiment, when the first positioning component is oriented toward the fourth direction relative to the second positioning component, the first track segment extends from the intersection center toward the fourth direction, the second track segment extends from the intersection center toward the second direction; the third track segment extends from the intersection center toward the first direction, and the fourth track segment extends from the intersection center toward the third direction; the first direction and the third direction are parallel and opposite. In one embodiment, the first positioning component has a first track and a second track, the second positioning component has a positioning axis, the second positioning component has a first slider and a second slider, and the first slider is coaxially arranged with the positioning axis, and the second slider is located on one side of the first slider along the fourth direction; wherein, the first track and the second track are intersected and form an intersection center, when the first positioning component is oriented relative to the second positioning component in the first direction, the first slider is located at the intersection center, the second slider is located on the second track, and the first direction and the fourth direction are staggered. In one embodiment, the second track is divided by the intersection center to form a third track segment and a fourth track segment; when the first positioning component is oriented relative to the second positioning component in the first direction, the first slider is located at the intersection center, and the second slider is located in the fourth track segment. In one embodiment, the third track segment extends from the intersection center in a second direction, and the fourth track segment extends from the intersection center in a fourth direction; the second direction and the fourth direction are parallel and opposite. In one embodiment, the first slider slides along the first track, and the second slider slides along the second track; when the first positioning component is oriented in a second direction relative to the second positioning component, the first positioning component is recessed inward in the second direction relative to the second positioning component, the second direction being parallel to and opposite to the fourth direction. In one embodiment, the first track is divided by the intersection center to form a first track segment and a second track segment, and the second track is divided by the intersection center to form a third track segment and a fourth track segment; when the first positioning component is oriented in the second direction relative to the second positioning component, the first slider is located in the first track segment, and the second slider is located in the intersection center. In one embodiment, when the first positioning component is oriented toward the second direction relative to the second positioning component, the first track segment extends from the intersection center toward the second direction, the second track segment extends from the intersection center toward the fourth direction; the third track segment extends from the intersection center toward the third direction, and the fourth track segment extends from the intersection center toward the first direction; the first direction and the third direction are parallel and opposite. In one embodiment, the first slider slides along the first track, and the second slider slides along the second track; when the first positioning component is oriented relative to the second positioning component in the fourth direction, the first positioning component is pulled outward relative to the second positioning component in the fourth direction. In one embodiment, the first track is divided by the intersection center to form a first track segment and a second track segment, and the second track is divided by the intersection center to form a third track segment and a fourth track segment; when the first positioning component is oriented in the fourth direction relative to the second positioning component, the first slider is located in the second track segment, and the second slider is located at the intersection center. In one embodiment, when the first positioning component is oriented toward the fourth direction relative to the second positioning component, the first track segment extends from the intersection center toward the fourth direction, the second track segment extends from the intersection center toward the second direction; the third track segment extends from the intersection center toward the first direction, and the fourth track segment extends from the intersection center toward the third direction; the first direction and the third direction are parallel and opposite, and the second direction and the fourth direction are parallel and opposite. In one embodiment, the shape of the projection of the first positioning component onto the second positioning component is symmetrical about the positioning axis; when the first positioning component is oriented relative to the second positioning component in the first direction, the position of the orthogonal projection of the first positioning component onto the second positioning component is the same as the position of the orthogonal projection of the first positioning component onto the second positioning component when the first positioning component is oriented relative to the second positioning component in a third direction, wherein the first direction is parallel to and opposite to the third direction. In one embodiment, the first track and the second track are intersected to form an intersection center, and the distance between the intersection center and the end of the first track or the end of the second track is greater than or equal to the distance between the first slider and the second slider. In one embodiment, the positioning component further includes a first connecting mechanism, which includes at least two sets of engaging hooks. Each set of engaging hooks is pivotally connected to the first positioning component and has a locked position and an unlocked position. When at least two sets of engaging hooks are in the locked position, each set of engaging hooks is used to engage and lock with the vehicle body. In one embodiment, the first connecting mechanism includes three sets of engaging hooks, which are arranged sequentially at intervals along a fifth direction. At least two adjacent sets of engaging hooks are used to engage and lock with the vehicle body, so that the vehicle body has a first use state and a second use state relative to the positioning component. The fifth direction is the front-rear direction of the vehicle body. In one embodiment, when in the first usage state, the vehicle body is locked to the first two sets of engaging hooks located near the front end of the vehicle body, and the front end of the vehicle body protrudes outward relative to the first positioning component along the orientation of the vehicle body; when in the second usage state, the vehicle body is locked to the last two sets of engaging hooks located near the rear end of the vehicle body, and the front end of the vehicle body retracts inward relative to the first positioning component along the orientation of the vehicle body. This application also provides a positioning component for mounting a vehicle body to a car seat, comprising: a first positioning component for connecting the vehicle body; and a second positioning component for connecting the car seat, wherein one of the first positioning component and the second positioning component is provided with a first track and a second track, and the other is provided with a sliding component; wherein the first track intersects the second track, and the sliding component is capable of rotating within the first track and sliding within the second track; the first positioning component rotates relative to the second positioning component by means of the sliding component rotating within the first track, and slides relative to the second positioning component by means of the sliding component sliding within the second track. In one embodiment, the first positioning component is provided with the sliding component, the second positioning component is provided with the first track and the second track, the first track and the second track are connected at the intersection, and the sliding component is capable of continuously sliding between the first track and the second track. In one embodiment, the first track includes a first channel with a circular structure, the second track includes a second channel with a strip-shaped structure, and the first channel and the second channel are connected at the intersection; the second track extends along a second direction or away from the second direction. In one embodiment, the sliding component includes a slider connected to the first positioning component and capable of rotating within the first channel and sliding within the second channel. In one embodiment, the length L1 and width W1 of the slider are both less than or equal to the diameter D of the first channel to allow the slider to rotate within the first channel; and / or the length L1 of the slider is greater than the width W2 of the second channel, and the width W1 of the slider is less than or equal to the width W2 of the second channel to allow the slider to slide within the second channel while restricting rotation within the second channel. In one embodiment, the second channel is divided into a third track segment and a fourth track segment by the first channel, and the third track segment and the fourth track segment are respectively connected to the first channel. The third track segment extends from the first channel in a second direction, and the fourth track segment extends from the first channel away from the second direction. When the first positioning component rotates relative to the second positioning component to face or away from the second direction, the length direction of the slider is parallel to the second direction. In one embodiment, the second channel is divided into a third track segment and a fourth track segment by the first channel, and the third track segment and the fourth track segment are respectively connected to the first channel. The third track segment extends from the first channel in a second direction, and the fourth track segment extends from the first channel away from the second direction. When the first positioning component rotates relative to the second positioning component to face or away from the second direction, the first positioning component can extend or retract outward relative to the second positioning component. In one embodiment, the second positioning component includes a second housing having a second mounting cavity; the first track further includes a first groove; the second track further includes a second groove; both the first channel and the second channel are disposed on the second housing facing the second mounting cavity; the first groove is disposed on the second housing and located inside the first channel; the second groove is disposed on the second housing and located inside the second channel; the second groove communicates with the first groove and extends along the extension direction of the second channel; the sliding component further includes a sliding rod connected to the first positioning component and passing through the first groove or the second groove to connect with the slider. In one embodiment, the first track includes a first channel in a ring-shaped structure, the second track includes a second channel in a strip-shaped structure, the second channel passes through the first channel and is connected at the intersection; the sliding component includes two sliders, the two sliders are capable of sliding synchronously in the first channel to rotate the first positioning component relative to the second positioning component, and the two sliders are capable of sliding synchronously in the second channel to slide the first positioning component relative to the second positioning component. In one embodiment, the distance H1 between the sidewalls of the two sliders facing the center of the first channel is greater than or equal to the inner diameter D1 of the first channel, so as to allow the two sliders to move synchronously within the first channel; and / or the distance H1 between the sidewalls of the two sliders facing the center of the first channel is greater than the width W2 of the second channel, so as to allow the sliders to slide within the second channel while restricting their rotation within the second channel. In one embodiment, the second channel is divided by the first channel to form a third track segment, a fifth track segment, and a fourth track segment arranged in sequence; the first channel is divided by the second channel to form a first arc segment and a second arc segment; the first end of the first arc segment and the first end of the second arc segment are both connected to the first end of the fifth track segment and the third track segment, and the second end of the first arc segment and the second end of the second arc segment are both connected to the second end of the fifth track segment and the fourth track segment. In one embodiment, the second positioning component includes a second housing having a second mounting cavity; the first track further includes a first groove; the second track further includes a second groove; both the first channel and the second channel are disposed on the second housing facing the second mounting cavity; the first groove is disposed on the second housing and located within the first channel; the second groove is disposed on the second housing and located within the second channel; the second groove communicates with the first groove and extends along the extension direction of the second channel; the sliding component further includes two sliding rods, both of which are connected to the first positioning component and pass through the first groove or the second groove to be connected to the two sliders respectively. In one embodiment, the first track includes a first groove with an annular structure, and the second track includes a second groove with a strip-shaped structure. The first groove and the second groove are connected at their intersection. The sliding assembly includes two sliders and two sliding rods. Both sliding rods are connected to the first positioning assembly and are arranged opposite to each other. The two sliding rods pass through the first groove or the second groove and are respectively connected to the two sliders. The two sliding rods can slide simultaneously in the first groove to allow the first positioning assembly to rotate relative to the second positioning assembly, and the two sliders can slide synchronously in the second groove to allow the first positioning assembly to slide relative to the second positioning assembly. This application also provides another positioning component for mounting a vehicle body to a car seat, comprising: a first positioning component for connecting the vehicle body; a second positioning component for connecting the car seat, wherein one of the first positioning component and the second positioning component is provided with a first track and a second track, and the other is provided with a sliding component, the sliding component sliding along the first track and the second track to simultaneously displace the first positioning component relative to the second positioning component; and an anti-misuse mechanism movably disposed on the first positioning component or the second positioning component for selectively allowing or restricting the movement of the sliding component, thereby selectively restricting the angle of rotation of the first positioning component relative to the second positioning component. In one embodiment, the sliding assembly includes a first slider and a second slider, the first slider sliding along one of the first track or the second track, and the second slider sliding along the other of the first track or the second track. This application also provides another positioning component for mounting a vehicle body to a car seat. The positioning component includes: a first positioning component for connecting the vehicle body; a second positioning component for connecting the car seat; one of the first and second positioning components having a first track and a second track, and the other having a first slider and a second slider; the first slider sliding along one of the first track or the second track, and the second slider sliding along the other of the first track or the second track, so that the first positioning component is displaced simultaneously with rotation relative to the second positioning component; and an anti-misuse mechanism movably disposed on the first or second positioning component for selectively allowing or restricting movement of the first slider or the second slider, thereby selectively restricting the angle of rotation of the first positioning component relative to the second positioning component. In one embodiment, the anti-misuse mechanism includes a blocking member movably disposed on the first positioning component or the second positioning component to extend into or out of the first track or the second track, thereby selectively allowing or restricting the movement of the first slider or the second slider. In one embodiment, the first track and the second track form an intersection center at their intersection; the first slider slides along the second track, and the second slider slides along the first track. In one embodiment, the distance between the intersection center and the end of the first track or the end of the second track is greater than or equal to the distance between the first slider and the second slider. In one embodiment, the first track extends along a first direction or a third direction, and the second track extends along a second direction or a fourth direction; wherein the first direction is parallel to and opposite to the third direction, the second direction is parallel to and opposite to the fourth direction, and the first direction and the second direction intersect. In one embodiment, when the first slider is located at the intersection center and the second slider is located on the first track, the first positioning component rotates relative to the second positioning component to an extension direction toward the first track; and / or when the second slider is located at the intersection center and the first slider is located on the second track, the first positioning component rotates relative to the second positioning component to an extension direction toward the second track. In one embodiment, the blocking member is movably disposed on the movement path of the first slider within the second track to restrict the first positioning component from rotating relative to the second positioning component toward the second direction or the fourth direction. In one embodiment, the blocking member is movably disposed on the movement path of the second slider within the first track to restrict the first positioning component from rotating relative to the second positioning component toward the first direction or the third direction. In one embodiment, the blocking member has a first position and a second position; when the blocking member is in the first position, the blocking member extends at least partially into the first track to block the second slider from moving within the first track, thereby restricting the first positioning component from rotating relative to the second positioning component to face the first direction or a third direction; when the blocking member is in the second position, the blocking member retracts from the first track. In one embodiment, the first track is divided by the intersection center to form a first track segment and a second track segment, the first track segment extending from the intersection center toward the first direction, and the second track segment extending from the intersection center toward the third direction; when the first positioning component is oriented toward the first direction relative to the second positioning component, the first slider is located at the intersection center, and the second slider is located in the second track segment; the blocking member is movably disposed on the movement path of the second slider within the second track segment. In one embodiment, when the second slider moves from the intersection center toward the second track segment and the blocking member is in the first position, the blocking member extends at least partially into the second track segment to restrict the movement of the second slider within the second track segment, thereby restricting the first positioning component from rotating relative to the second positioning component toward the first direction. In one embodiment, the first positioning component is provided with the first slider and the second slider, and the second positioning component is provided with the first track and the second track. In one embodiment, the anti-misuse mechanism further includes a release assembly disposed on the first positioning assembly or the second positioning assembly and drivenly connected to the blocking member, for driving the blocking member out of the first track or the second track, thereby allowing the movement of the first slider or the second slider. In one embodiment, the anti-misuse mechanism further includes a release component disposed on the first positioning component or the second positioning component and drivenly connected to the blocking member, for driving the blocking member out of the first track or the second track, thereby allowing the movement of the sliding component. In one embodiment, the release assembly includes an operating member and a traction member. The operating member is movably disposed on the first positioning component or the second positioning component and has a locked position and a release position. The traction member is connected between the operating member and the blocking member. When the operating member switches from the locked position to the release position, the operating member drives the blocking member to exit the first track or the second track through the traction member. In one embodiment, the anti-misuse mechanism further includes a first reset member, which provides an elastic restoring force to the blocking member so that the blocking member extends into the first track or the second track to restrict the movement of the first slider or the second slider. In one embodiment, the anti-misuse mechanism further includes a fixing seat disposed on the first positioning component or the second positioning component, and the fixing seat has a cavity and a first opening communicating with the cavity, the first opening facing the first track or the second track, the blocking member being movably disposed in the cavity, and the blocking member being at least partially able to pass through the first opening and extend into the first track or the second track. In one embodiment, the fixing base is further provided with an operating hole communicating with the cavity. The operating hole is disposed opposite to the first opening, and the traction member passes through the operating hole and is connected to the blocking member. In one embodiment, the anti-misuse mechanism further includes a status locking component disposed on the second positioning component and used to lock the operating element in the locked position or the released position. In one embodiment, the operating member is provided with a limiting portion; the state locking component includes a locking member, which is movably disposed on the first positioning component or the second positioning component and has a third position and a fourth position; when the locking member is in the third position, the locking member abuts against the limiting portion to restrict the operating member from switching between the locked position and the unlocked position; when the locking member is in the fourth position, the locking member separates from the limiting portion. In one embodiment, the state locking component further includes a second reset member for providing an elastic restoring force to the locking member so that the locking member remains in the third position. In one embodiment, the positioning component further includes an engagement indicator mechanism disposed on the first positioning component or the second positioning component, and used to indicate whether the first positioning component is rotated relative to the second positioning component to an extension direction toward the first track or the second track. This application also provides another positioning component for mounting a vehicle body to a car seat. The positioning component includes: a first positioning component for connecting the vehicle body; a second positioning component for connecting the car seat, wherein one of the first and second positioning components is provided with a first track and a second track, and the other is provided with a first slider and a second slider, wherein the first slider slides along one of the first track or the second track, and the second slider slides along the other of the first track or the second track, so that the first positioning component is simultaneously displaced relative to the rotation of the second positioning component; and an engagement indicator mechanism disposed on the first or second positioning component, for indicating whether the first positioning component has rotated relative to the second positioning component to an extension direction toward the first track or the second track. In one embodiment, the engagement indicator mechanism includes: a movable member having an indicator area, the movable member being movably disposed on the first positioning component or the second positioning component to give the indicator area a first indicator position and a second indicator position; and a driving member being rotatably disposed on the first positioning component or the second positioning component and drivenly connected to the movable member, the driving member being used to drively cooperate with the first sliding member or the second sliding member to drive the movable member to move, thereby changing the position of the indicator area. In one embodiment, the drive member has a first pushing portion and a pushing portion, the pushing portion being pivotally connected to the movable member, and the first pushing portion being used to drive the first sliding member or the second sliding member to pivot the drive member to drive the movable member to move. In one embodiment, the first slider and / or the second slider are provided with a second abutting portion, the second abutting portion being formed with a pushing slope, the pushing slope being adapted to drive the driving member to rotate in a driving cooperation with the first abutting portion. In one embodiment, the first slider slides along the second track, and the second slider slides along the first track; the intersection of the first track and the second track forms an intersection center. In one embodiment, when the first slider is located at the intersection center and the second slider is located within the first track, the first positioning component rotates relative to the second positioning component to face the extension direction of the first track, the first track extending along a first direction or a third direction; when the second slider is located at the intersection center and the first slider is located within the second track, the first positioning component rotates relative to the second positioning component to face the extension direction of the second track, the second track extending along a second direction or a fourth direction; wherein the first direction is parallel to and opposite to the third direction, and the second direction is parallel to and opposite to the fourth direction. In one embodiment, the first positioning component is provided with a first sliding member and a second sliding member, and the second positioning component is provided with a first track and a second track; the second positioning member is provided with a second mounting cavity, the second mounting cavity is connected to the first track and the second track, the driving member is rotatably disposed in the second mounting cavity, and the first sliding member or the second sliding member is provided with a second pushing part, the second pushing part at least partially passing through the second track or the first track and extending into the second mounting cavity so as to be able to drive and cooperate with the driving member. In one embodiment, the movable member is movably disposed within the second mounting cavity, the driving member is located below and opposite to the intersection center, the first sliding member is provided with a second abutting portion, and when the first positioning component rotates relative to the second positioning component to face the first direction or the third direction, the second abutting portion of the first sliding member abuts the driving member to cause the driving member to rotate; or the second sliding member is provided with a second abutting portion, and when the first positioning component rotates relative to the second positioning component to face the second direction or the fourth direction, the second abutting portion of the second sliding member abuts the driving member to cause the driving member to rotate. In one embodiment, the first positioning component is provided with a first sliding member and a second sliding member, the second positioning component is provided with a first track and a second track, and the intersection of the first track and the second track forms a cross center. The movable member is movably disposed in the second mounting cavity of the second positioning component. The driving member is located below the cross center and is disposed opposite to the cross center. The first sliding member is provided with a second pushing part. When the first sliding member is located at the cross center, the second pushing part pushes against the driving member to make the driving member rotate; or the second sliding member is provided with a second pushing part. When the second sliding member is located at the cross center, the second pushing part pushes against the driving member to make the driving member rotate. In one embodiment, the indicator area is provided with an indicator color block; the first positioning component or the second positioning component is provided with an indicator window, and the indicator area switches between the first indicator position and the second indicator position so that the indicator color block can selectively face the indicator window. In one embodiment, the engagement indication mechanism further includes a third reset member, which abuts against one of the movable member or the driving member and is used to drive the movable member to reset. This application also provides a vehicle, including: a vehicle body and a positioning component as described above, wherein the first positioning component is connected to the vehicle body and the second positioning component is used to connect to a car seat. This application also provides a vehicle, comprising: a vehicle body having at least two engaging members, wherein the at least two engaging members are spaced apart along the front-rear direction of the vehicle body; a positioning assembly including a first positioning assembly and a second positioning assembly, wherein the first positioning assembly is used to connect to the vehicle body and the second positioning assembly is used to connect to a car seat, and the first positioning assembly is rotatable relative to the second positioning assembly; and a first connecting mechanism including at least three sets of engaging hooks, wherein each set of engaging hooks is pivotally connected to the first positioning assembly in sequence along the front-rear direction of the vehicle body, so that each set of engaging hooks has a locked position and an unlocking position. Position: When at least two sets of the engagement hooks are in the locked position, each set of engagement hooks is used to engage and lock with the vehicle body; wherein, at least two engagement members can be selectively locked to any adjacent at least two sets of engagement hooks, so that the vehicle body has a first use state and a second use state relative to the positioning component. When in the first use state, the vehicle body protrudes outward relative to the first positioning component along the orientation of the vehicle body. When in the second use state, the vehicle body retracts inward relative to the first positioning component along the orientation of the vehicle body. In one embodiment, the vehicle body has two engaging members, and the first connecting mechanism includes three sets of engaging hooks. When in the first usage state, the two engaging members are respectively locked to the first two sets of engaging hooks located near the front end of the first positioning component, and the front end of the vehicle body protrudes outward relative to the first positioning component along the orientation of the vehicle body. When in the second usage state, the two engaging members are respectively locked to the latter two sets of engaging hooks located near the rear end of the first positioning component, and the front end of the vehicle body retracts inward relative to the first positioning component along the orientation of the vehicle body. In one embodiment, the vehicle body has three engaging members, and the first connecting mechanism includes three sets of engaging hooks. When in the first usage state, the two adjacent first engaging members or the two adjacent last engaging members are respectively locked to the two sets of engaging hooks located near the front end of the first positioning component, and the front end of the vehicle body protrudes outward relative to the first positioning component along the orientation of the vehicle body. When in the second usage state, the two adjacent first engaging members are respectively locked to the two sets of engaging hooks located near the rear end of the first positioning component, and the front end of the vehicle body retracts inward relative to the first positioning component along the orientation of the vehicle body. To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below. A first aspect of the present invention provides a vehicle A1000, which includes a vehicle body A200 and a positioning component A100 provided in some embodiments of the present invention. The vehicle body A200 can be fixedly mounted on the positioning component A100; alternatively, the vehicle body A200 can be detachably mounted on the positioning component A100. The vehicle body A200 can be mounted to a car seat (not shown in the figure) via the positioning component A100. The vehicle body A200 and the positioning component A100 will be described concurrently with the following description of the vehicle A1000. In one embodiment, the type of vehicle body A200 can be, for example, a child safety seat (see Figure 14), an infant safety carrier (see Figure 41), or a sleeping box, etc., and the user can choose the type of vehicle body A200 according to the child's age, height, or weight. Specifically, the bottom of the vehicle body A200 is provided with a locking member A210 (see Figure 48). As shown in Figures 1 and 2, the positioning component A100 may include a first positioning component A110 and a second positioning component A120. The first positioning component A110 is used to connect the vehicle body A200, and the second positioning component A120 is used to connect the car seat. Specifically, the first positioning component A110 is provided with a first connecting mechanism A150, which is used to detachably connect to the locking member A210 of the vehicle body A200. Specifically, the first connecting mechanism A150 includes a locking hook A151, which is pivotally connected to the first positioning component A110 and has a locked position and an unlocked position. When the engaging hook A151 is in the locked position, it engages with the engaging member A210 for locking; when the engaging hook A151 is in the unlocked position, the engaging member A210 can disengage from the engaging hook A151, allowing the vehicle body A200 to disengage from the first positioning assembly A110. More specifically, the detailed structure of the first connecting mechanism A150 is described later. The second positioning assembly A120 is equipped with a seat connecting mechanism A161 (e.g., an ISOFIX connector) and a support leg A162. The seat connecting mechanism A161 is mainly used to fix the second positioning assembly A120 to the vehicle seat, and the support leg A162 is used to abut against the vehicle's interior floor to improve the reliability and stability of the positioning assembly A100 installation. In the positioning component A100 provided by the aforementioned vehicle A1000, one of the first positioning component A110 and the second positioning component A120 is provided with a first track A131 and a second track A132, and the other is provided with a first slider A141 and a second slider A142. Specifically, the first track A131 and the second track A132 are intersected to form an intersection center A133. The first track A131 is divided by the intersection center A133 to form a first track segment A1311 and a second track segment A1312, and the second track A132 is divided by the intersection center A133 to form a third track segment A1321 and a fourth track segment A1322. When the first slider A141 is located at the intersection center A133, the second slider A142 can be located at any one of the first track segment A1311, the second track segment A1312, the third track segment A1321, and the fourth track segment A1322. The first positioning component A110 rotates and slides relative to the second positioning component A120 by means of the first slider A141 sliding along one of the first track A131 or the second track A132 and the second slider A142 sliding along the other of the first track A131 or the second track A132. To facilitate the following explanation of the working principle and process of the rotation and sliding of the first positioning component A110 relative to the second positioning component A120, the intersection center A133 is regarded as point M or point N', the end of the first track segment A1311 away from the intersection center A133 is regarded as point N'', the end of the second track segment A1312 away from the intersection center A133 is regarded as point N, the end of the third track segment A1321 away from the intersection center A133 is regarded as point M', and the end of the fourth track segment A1322 away from the intersection center A133 is regarded as point M''. Referring to Figures 3 and 4, in the positioning component A100 provided in the first embodiment, the second positioning component A120 is provided with a first track A131 and a second track A132 that are intersected (see Figure 4). Specifically, the first track A131 extends along a first direction F1 or a third direction F3, and the second track A132 extends along a second direction F2 or a fourth direction F4. More specifically, the first track segment A1311 extends from the intersection center A133 to the first direction F1, the second track segment A1312 extends from the intersection center A133 to the third direction F3; the third track segment A1321 extends from the intersection center A133 to the second direction F2, and the fourth track segment A1322 extends from the intersection center A133 to the fourth direction F4. The first direction F1 and the third direction F3 are parallel and opposite, the second direction F2 and the fourth direction F4 are parallel and opposite, and the first direction F1 and the second direction F2 intersect. More specifically, the first direction F1 and the second direction F2 are perpendicular. The first positioning component A110 is provided with a first sliding member A141 and a second sliding member A142 (see Figure 3). The first positioning component A110 has a rotation axis, the first sliding member A141 is coaxially arranged with the rotation axis, and the second sliding member A142 is offset from the rotation axis (see Figures 3, 15, 20, and 23). Specifically, in this embodiment, when the first positioning component A110 is generally in the shape of a disk, the aforementioned rotation axis can be regarded as the center of the first positioning component A110. Of course, in other embodiments, the first positioning component A110 can be other symmetrical shapes (e.g., ellipse, rectangle, etc.), and the rotation axis can be the geometric center of the first positioning component A110 or a position offset from the geometric center; or, the first positioning component A110 can also be an asymmetrical shape, and the rotation axis can be set according to actual needs. It should be noted that, taking the normal driving state of the car as a reference, the first direction F1 refers to the front of the car when the positioning component A100 is installed on the car seat, which is equivalent to the direction towards the front of the car. The third direction F3 can be regarded as the rear of the car when it is normally driving, which is the direction towards the rear of the car. The second direction F2 can be regarded as the left side of the car when it is normally driving, which is the direction towards the left side door of the car. The fourth direction F4 can be regarded as the right side of the car when it is normally driving, which is the direction towards the right side door of the car. In this embodiment, the first positioning component A110 has a front end, a rear end, a left end, and a right end. To clearly understand the various ends of the first positioning component A110, taking the vehicle body A200 installed on the first positioning component A110 as an example, the front-rear direction of the vehicle body A200 is parallel to the front-rear direction of the first positioning component A110, and the left-right direction of the vehicle body A200 is parallel to the left-right direction of the first positioning component A110. Specifically, when an infant or child is seated inside the vehicle body A200, the front end of the first positioning component A110 is closer to the infant's or child's feet than its rear end; conversely, the rear end of the first positioning component A110 is closer to the infant's or child's head than its front end; the left end of the first positioning component A110 is closer to the infant's or child's left hand than its right end; and the right end of the first positioning component A110 is closer to the infant's or child's right hand than its left end. When the first positioning component A110 faces a certain direction, it means that the vehicle body A200 is also facing that same direction; at the same time, the child seated inside the vehicle body A200 is also facing that same direction. To visually understand the front-back and left-right directions of the vehicle body A200 and the first positioning component A110, arrows Q1 and Q3 are used to schematically indicate the "front" and "rear" directions, and arrows Q2 and Q4 are used to schematically indicate the "left" and "right" directions, respectively. In this context, direction Q1 is parallel to and opposite to direction Q3, direction Q2 is parallel to and opposite to direction Q4, and direction Q1 and direction Q2 intersect. Specifically, direction Q1 is perpendicular to direction Q2. These directional terms are used only to make the description of the embodiments of the present invention clearer and are not intended to unduly limit the scope of protection of the present invention. The following phrase, "the first positioning component A110 is oriented towards the first direction F1 relative to the second positioning component A120," means that the front end of the first positioning component A110 is oriented towards the first direction F1; "the first positioning component A110 is oriented towards the second direction F2 relative to the second positioning component A120," means that the front end of the first positioning component A110 is oriented towards the second direction F2; "the first positioning component A110 is oriented towards the third direction F3 relative to the second positioning component A120," means that the front end of the first positioning component A110 is oriented towards the third direction F3; "the first positioning component A110 is oriented towards the fourth direction F4 relative to the second positioning component A120," means that the front end of the first positioning component A110 is oriented towards the fourth direction F4.To clearly understand the setting position of the second slider A142 relative to the first slider A141 in the first embodiment, the setting position of the second slider A142 will be described below with reference to the first positioning component A110 being oriented toward the first direction F1 relative to the second positioning component A120, and the first positioning component A110 being approximately in a disk-shaped structure. In the first embodiment, with respect to the first positioning component A110, when the first slider A141 is located at the rotation axis, the second slider A142 can be located behind the first slider A141 (see Figures 3 and 8). This means that when the first positioning component A110 is oriented towards the first direction F1 relative to the second positioning component A120, the first slider A141 is located at the intersection center A133, and the second slider A142 is located on the side of the first slider A141 along the third direction F3, i.e., the second slider A142 is located on the second track segment A1312. Thus, the first positioning component A110 can rotate and slide relative to the second positioning component A120 by means of the sliding of the first slider A141 along the second track A132 and the sliding of the second slider A142 along the first track A131. The following, with reference to relevant diagrams, briefly explains the principle and process by which the first positioning component A110 in the positioning component A100 rotates and slides relative to the second positioning component A120 under the action of the first sliding component A141 sliding along the second track A132 and the second sliding component A142 sliding along the first track A131. Figure 1 shows a perspective view of positioning component A100 when the first positioning component A110 is oriented towards the first direction F1 relative to the second positioning component A120. Figure 2 shows a perspective view of positioning component A100 when the first positioning component A110 is oriented towards the third direction F3 relative to the second positioning component A120. Figure 5 can be considered a top view of positioning component A100 when the first positioning component A110 is oriented towards the first direction F1 or the third direction F3 relative to the second positioning component A120 (the specific principle can be found later), in which the first positioning component A110 is rendered in perspective and replaced by a virtual circular structure. Similarly, the first positioning component A110 in Figures 6, 7, 21, and 22 can also be rendered in perspective. As shown in Figures 3 to 5, when the first slider A141 is located at the rotation axis and the second slider A142 is located behind the first slider A141 along the front-back direction of the first positioning component A110, when the first positioning component A110 is positioned relative to the second positioning component A120 and facing the first direction F1, the first slider A141 is located at the intersection center A133, i.e., point M or point N', and the second slider A142 is located at the end of the second track segment A1312 away from the intersection center A133, i.e., point N. When the user needs to switch the orientation of the first positioning component A110 relative to the second positioning component A120 from facing the first direction F1 to facing the second direction F2, it is equivalent to changing the orientation of the vehicle body A200 from facing forward to facing left. As shown in Figures 3 and 4, the user can directly pull the vehicle body A200, causing the vehicle body A200 to move the first positioning component A110, so that the first positioning component A110 tends to rotate counterclockwise. In this way, the first slider A141 can move from point M to point M' within the third track segment A1321, and at the same time, the second slider A142 can move synchronously from point N to point N' within the second track segment A1312 (switching from Figure 5 to Figure 6, and from Figure 8 to Figure 9). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and simultaneously moves from the intersection center A133 to the side relative to the second positioning component A120 (specifically, it moves along the left side, in the second direction F2), so as to protrude beyond the left edge of the second positioning component A120 (switching from Figure 1 to Figure 12). When the first slider A141 moves to point M', the second slider A142 is located at point N', i.e., at the intersection center A133. At this time, the first positioning component A110 is oriented relative to the second positioning component A120 in the second direction F2, and the first positioning component A110 is pulled outward relative to the second positioning component A120 along the second direction F2. It should be noted that the switching process of the first positioning component A110 relative to the second positioning component A120 in the direction of the first direction F1 and the second direction F2 is reversible. That is, the orientation of the first positioning component A110 relative to the second positioning component A120 can be switched from the direction of the first direction F1 to the direction of the second direction F2, or it can be switched from the direction of the second direction F2 to the direction of the first direction F1. When the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the second direction F2 to facing the third direction F3, it is equivalent to changing the vehicle body A200 from facing the left to facing the rear, as shown in Figures 3 and 4. The user can pull the vehicle body A200, causing the vehicle body A200 to move the first positioning component A110, so that the first positioning component A110 has a counterclockwise rotation tendency. In this way, the second sliding member A142 can move from point N' to point N'' in the first track segment A1311, and at the same time, the first sliding member A141 moves synchronously from point M' to point M in the third track segment A1321 (switching from Figure 6 to Figure 5, and from Figure 9 to Figure 10). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120. Simultaneously, the first positioning component A110 moves relative to the second positioning component A120 from a lateral direction (specifically, the left side, i.e., the second direction F2) towards the intersection center A133 (switching from Figure 12 to Figure 2). When the second slider A142 moves to point N'', the first slider A141 is located at point M, i.e., the intersection center A133. At this time, the first positioning component A110 is oriented relative to the second positioning component A120 towards the third direction F3. Similarly, the switching process of the first positioning component A110 relative to the second positioning component A120 towards the second direction F2 and the third direction F3 is reversible. Furthermore, when the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the third direction F3 to facing the fourth direction F4, it is equivalent to changing the vehicle body A200 from facing rearward to facing rightward, as shown in Figures 3 and 4. Pulling the vehicle body A200 causes the vehicle body A200 to move the first positioning component A110, so that the first positioning component A110 has a counterclockwise rotation tendency. In this way, the first sliding member A141 can move from point M to point M'' within the fourth track segment A1322, and the second sliding member A142 can move synchronously from point N'' to point N' within the first track segment A1311 (switching from Figure 5 to Figure 7, and from Figure 10 to Figure 11). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and simultaneously moves laterally relative to the second positioning component A120 from the intersection center A133 (specifically, it moves along the right side, i.e., the fourth direction F4), to protrude beyond the right edge of the second positioning component A120 (switching from Figure 2 to Figure 13). When the first slider A141 moves to point M'', the second slider A142 is located at point N', i.e., at the intersection center A133. At this time, the first positioning component A110 faces the fourth direction F4 relative to the second positioning component A120, and the first positioning component A110 is pulled outward relative to the second positioning component A120 along the fourth direction F4. Similarly, when the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the fourth direction F4 to facing the first direction F1, it is equivalent to changing the vehicle body A200 from facing the right to facing forward. By directly pulling the vehicle body A200, the vehicle body A200 moves the first positioning component A110, causing the first positioning component A110 to have a counterclockwise rotation tendency. In this way, the second sliding member A142 can move from point N' to point N in the second track segment A1312, and the first sliding member A141 moves synchronously from point M'' to point M in the fourth track segment A1322 (switching from Figure 7 to Figure 5, and from Figure 11 to Figure 8). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, while simultaneously moving relative to the second positioning component A120 from a lateral direction (specifically, the right-side direction, i.e., the fourth direction F4) towards the intersection center A133 (switching from Figure 13 to Figure 1). Similarly, the switching process of the first positioning component A110 relative to the second positioning component A120 towards the third direction F3 and the fourth direction F4 is reversible. The switching process of the first positioning component A110 relative to the second positioning component A120 towards the fourth direction F4 and the first direction F1 is also reversible. It should be noted that the above description uses the example of the first positioning component A110 rotating one full circle counterclockwise relative to the second positioning component A120 to illustrate the principle of sliding while rotating. Of course, the principle of sliding while rotating can also be illustrated using the example of the first positioning component A110 rotating one full circle clockwise relative to the second positioning component A120, which will not be elaborated upon here. In this embodiment, the distance R1 between the intersection center A133 and the end of the first track A131 is equal to the distance R3 between the first slider A141 and the second slider A142, i.e., R1 = R3. The distance R2 between the intersection center A133 and the end of the second track A132 is equal to the distance R3 between the first slider A141 and the second slider A142, i.e., R2 = R3. In other words, the length of each of the first track segment A1311, the second track segment A1312, the third track segment A1321, and the fourth track segment A1322 is equal to the distance R3 between the first slider A141 and the second slider A142. Of course, in other embodiments not shown, the distance R3 between the first slider A141 and the second slider A142 can be less than the distance R1 between the intersection center A133 and the end of the first track A131 and the distance R2 between the intersection center A133 and the end of the second track A132. In this way, when the first positioning component A110 rotates relative to the second positioning component A120 to face each direction, it can continue to slide in each direction. For example, when the first positioning component A110 rotates relative to the second positioning component A120 from the first direction F1 to the second direction F2, the second slider A142 is located at the intersection center A133, i.e., point M, and the first slider A141 is located between the two ends of the third track segment A1321, i.e., between point M' and point M. At this time, the user can continue to pull the first positioning component A110 along the second direction F2 so that the first slider A141 and the second slider A142 move on the third track segment A1321 until the first slider A141 is located at the end of the third track segment A1321 away from the intersection center A133, i.e., point M'. Alternatively, when the first positioning component A110 rotates relative to the second positioning component A120 from the first direction F1 to the second direction F2, the second slider A142 is located at the intersection center A133, i.e., point M, and the first slider A141 is located between the two ends of the third track segment A1321, i.e., between point M' and point M. At this time, the user can push the first positioning component A110 along the fourth direction F4 to move the first slider A141 and the second slider A142 from the third track segment A1321 to the fourth track segment A1322. It should be noted that the first positioning component A110 can be in the form of a disk, and the axis of rotation is the center of the disk. This makes the shape of the orthographic projection of the first positioning component A110 onto the second positioning component A120 symmetrical about the axis of rotation of the first positioning component A110. Furthermore, when the lengths of each track segment are the same, the overlapping area and range between the first positioning component A110 and the second positioning component A120 when the first positioning component A110 rotates relative to the second positioning component A120 and faces the first direction F1 are the same as the overlapping area and range between the first positioning component A110 and the second positioning component A120 when the first positioning component A110 faces away from the first direction F1. In other words, when the first positioning component A110 faces the second positioning component A120 relative to the second positioning component A120, the position of the orthographic projection of the first positioning component A110 on the second positioning component A120 is the same as the position of the orthographic projection of the first positioning component A110 on the second positioning component A120 when the first positioning component A110 faces the second positioning component A120 relative to the second positioning component A120. Therefore, the vehicle body A200 shown in Figure 5 can be regarded as either the first positioning component A110 rotating relative to the second positioning component A120 to face the first direction F1, or rotating to face the third direction F3. Based on the principle and process of the rotation and sliding of the first positioning component A110 relative to the second positioning component A120 described above, it can be seen that when the first positioning component A110 rotates relative to the second positioning component A120 from the first direction F1 or the third direction F3 to the second direction F2 or the fourth direction F4, the first positioning component A110 can rotate relative to the second positioning component A120 to change its orientation, and at the same time, it can also be pulled outward relative to the second positioning component A120 to get closer to the door (see Figures 12 and 13 for the state). In this way, the vehicle body A200 connected to the first positioning component A110 can get closer to the door when it rotates with the first positioning component A110 to the second direction F2 or the fourth direction F4 (see Figure 14 for the state). In other words, when the first positioning component A110 is oriented relative to the second positioning component A120 in the second direction F2 or the fourth direction F4, the first positioning component A110 can simultaneously be pulled outward relative to the second positioning component A120 to get closer to the vehicle door (e.g., closer to the left or right door), thus facilitating the user to take a child out of or place a child into the vehicle body A200. That is, rotation (steering) and sliding (e.g., lateral pulling out) can be performed simultaneously. Furthermore, since there is no need to perform a steering operation followed by a lateral pulling out as in the traditional method, the ease of operation is improved. In the positioning component A100 provided in the first embodiment, as shown in FIG4, the second positioning component A120 may include a second top cover A121 and a second bottom cover A122. The second top cover A121 and the second bottom cover A122 are connected vertically to form a second mounting cavity A123 (see FIG8). Referring to FIG3, FIG4 and FIG8, specifically, the first sliding member A141 may include a first sliding rod A1411 and a first slider A1412, and the second sliding member A142 may further include a second sliding rod A1421 and a second slider A1422. As shown in Figures 8 to 10, the first track A131 may include a first channel A1313 and a first groove A1314, and the second track A132 may include a second channel A1323 and a second groove A1324. Both the first channel A1313 and the second channel A1323 are located on the lower surface of the second top cover A121, facing the second mounting cavity A123. They intersect and communicate with each other, and both the first channel A1313 and the second channel A1323 are connected to the second mounting cavity A123. The first groove A1314 is located inside the first channel A1313, and the second groove A1324 is located inside the second channel A1323. Both the first groove A1314 and the second groove A1324 are through-slot structures. The first slider A141 is connected to the rotation axis of the first positioning assembly A110 via the first sliding rod A1411. The second slider A142 is connected to the first positioning assembly A110 via the second sliding rod A1421 and is offset from the rotation axis. The first sliding rod A1411 extends into the second slide groove A1324 and is connected to the first slider A1412. The second sliding rod A142 extends into the first slide groove A1314 and is connected to the second slider A1422. The first slider A141 slides along the second track A132 via the first slider A1412, and the second slider A142 slides along the first track A131 via the second slider A1422. Of course, in other embodiments, the first track A131 and the second track A132 can be groove structures provided on the upper surface of the second top cover A121. The first slider A141 can slide along the second track A132 via the first slider A1412, and the second slider A142 can slide along the first track A131 via the second slider A1422. It should be noted that the first slider A141 and the second slider A142 can both be integrally formed structures, that is, the first slider A1412 and the first sliding rod A1411 are integrally formed, and the second slider A1422 and the second sliding rod A1421 are integrally formed, and the second slider A1422 and the second sliding rod A1421 are integrally formed, and the second slider A1422 is integrally formed, and the second slider A1422 is integrally formed.Of course, in other embodiments, the first slider A1412 and the first sliding rod A1411 can be different components. The first slider A141 can be formed by connecting the first slider A1412 and the first sliding rod A1411 through welding, riveting, or other methods. The second slider A1422 and the second sliding rod A1421 can also be different components. The second slider A142 can be formed by connecting the second slider A1422 and the second sliding rod A1421 through welding, riveting, or other methods. It should be noted that the above-mentioned "through groove structure" refers to a groove that is connected to the second mounting cavity A123, while the "groove structure" refers to a groove that is not connected to the second mounting cavity A123. Referring to Figures 4 and 15, the second embodiment of the present invention provides a positioning component A100, which can be considered a variation of the positioning component A100 in the first embodiment, the main difference being the position of the second sliding member A142. Unless otherwise specified, the following mainly describes the differences between this embodiment and the first embodiment described above. Specifically, in the second embodiment, regarding the first positioning component A110, when the first slider A141 is located at the rotation axis, the second slider A142 can also be located in front of the first slider A141 along the front-back direction of the first positioning component A110 (see Figures 10 and 15). When the first positioning component A110 faces the first direction F1 relative to the second positioning component A120, the first slider A141 is located at the intersection center A133, and the second slider A142 is located in front of the first slider A141, that is, on one side of the first slider A141 along the first direction F1. At this time, the second slider A142 is located on the first track segment A1311. In this way, the first positioning component A110 can also rotate and slide relative to the second positioning component A120 by means of the sliding of the first slider A141 along the second track A132 and the sliding of the second slider A142 along the first track A131. The following, with reference to relevant diagrams, briefly explains the principle and process by which the first positioning component A110 in the positioning component A100 rotates and slides relative to the second positioning component A120 under the action of the first sliding component A141 sliding along the second track A132 and the second sliding component A142 sliding along the first track A131. It should be noted that when the illustrations related to the second slider A142 being located behind the first slider A141 are the same as those related to the second slider A142 being located in front of the first slider A141, the explanation of the relevant illustrations in the first embodiment can be referred to. Furthermore, the relationship between the distance between the first slider A141 and the second slider A142 and the length of each track segment can be referred to the description in the first embodiment. Specifically, when the first slider A141 is located at the rotation axis and the second slider A142 is located in front of the first slider A141, referring to Figure 5, when the first positioning component A110 is positioned relative to the second positioning component A120 facing the first direction F1, the first slider A141 is located at the intersection center A133, i.e., point M or point N', and the second slider A142 is located at the end of the first track segment A1311 away from the intersection center A133, i.e., point N''. When the user needs to switch the orientation of the first positioning component A110 relative to the second positioning component A120 from facing the first direction F1 to facing the second direction F2, it is equivalent to changing the orientation of the vehicle body A200 from facing forward to facing left. As shown in Figures 4 and 15, the user can directly pull the vehicle body A200, causing the vehicle body A200 to move the first positioning component A110, so that the first positioning component A110 tends to rotate counterclockwise. In this way, the first slider A141 can move from point M to point M'' within the fourth track segment A1322, while the second slider A142 moves synchronously from point N'' to point N' within the first track segment A1311 (switching from Figure 5 to Figure 7, and from Figure 10 to Figure 11). It should be noted that the positioning component A100 shown in Figures 7, 10, and 11 in this embodiment is slightly different from the positioning component A100 shown in the first embodiment when referring to the same Figures 7, 10, and 11. The difference is that in this embodiment, when referring to Figures 7 and 11, the first positioning component A110 is oriented towards the second direction F2; while in the first embodiment, when referring to Figures 7 and 11, the first positioning component A110 is oriented towards the fourth direction F4. In addition, in this embodiment, when referring to Figure 10, the first positioning component A110 is oriented towards the first direction F1; while in the first embodiment, when referring to Figure 7, the first positioning component A110 is oriented towards the third direction F3. During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and simultaneously moves to the right relative to the second positioning component A120 from the intersection center A133, thus retracting relative to the left edge of the second positioning component A120 and protruding from the right edge (switching from Figure 1 to Figure 16). That is, while the first positioning component A110 rotates in the second direction F2, it also moves in the fourth direction F4. When the first slider A141 moves to point M'', the second slider A142 is located at point N', i.e., at the intersection center A133. At this time, the first positioning component A110 is oriented towards the second direction F2 relative to the second positioning component A120, and the first positioning component A110 retracts inward along the second direction F2 relative to the second positioning component A120. When the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the second direction F2 to facing the third direction F3, it is equivalent to changing the orientation of the vehicle body A200 from facing left to facing rear. As shown in Figures 4 and 15, the user can pull the vehicle body A200, causing the vehicle body A200 to move the first positioning component A110, so that the first positioning component A110 has a counterclockwise rotation tendency. In this way, the second slider A142 can move from point N' to point N within the second track segment A1312, and at the same time, the first slider A141 can move synchronously from point M'' to point M within the fourth track segment A1322 (switching from Figure 7 to Figure 5, and from Figure 11 to Figure 8). Similarly, the positioning component A100 shown in FIG8 in this embodiment is slightly different from the positioning component A100 shown in FIG8 in the first embodiment. The difference is that in this embodiment, when referring to FIG8, the first positioning component A110 faces the third direction F3; while in the first embodiment, when referring to FIG8, the first positioning component A110 faces the first direction F1. During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and at the same time, the first positioning component A110 moves relative to the second positioning component A120 from the right edge towards the intersection center A133 (switching from FIG16 to FIG2). When the second slider A142 moves to N, the first slider A141 is located at point M, that is, at the intersection center A133. At this time, the first positioning component A110 faces the third direction F3 relative to the second positioning component A120. Furthermore, when the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the third direction F3 to facing the fourth direction F4, it is equivalent to changing the vehicle body A200 from facing rearward to facing rightward. As shown in Figures 4 and 15, pulling the vehicle body A200 causes the vehicle body A200 to move the first positioning component A110, so that the first positioning component A110 has a counterclockwise rotation tendency. In this way, the first sliding member A141 can move from point M to point M' within the third track segment A1321, and the second sliding member A142 can move synchronously from point N to point N' within the second track segment A1312 (switching from Figure 5 to Figure 6, and from Figure 8 to Figure 9). Similarly, the positioning component A100 shown in Figures 6 and 9 in this embodiment is slightly different from the positioning component A100 shown in the first embodiment when referring to the same Figures 6 and 9. The difference is that in this embodiment, when referring to Figures 6 and 9, the first positioning component A110 is oriented towards the fourth direction F4; while in the first embodiment, when referring to Figures 6 and 9, the first positioning component A110 is oriented towards the second direction F2. During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and at the same time, it can move to the left relative to the second positioning component A120 from the intersection center A133, so as to be recessed relative to the right edge of the second positioning component A120 and protrude from the left edge (switching from Figure 2 to Figure 18), that is, turning towards the fourth direction F4 and moving towards the second direction F2. When the first slider A141 moves to point M', the second slider A142 is located at point N', that is, at the intersection center A133. At this time, the first positioning component A110 is oriented in the fourth direction F4 relative to the second positioning component A120, and the first positioning component A110 is retracted inward along the fourth direction F4 relative to the second positioning component A120. Similarly, when the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the fourth direction F4 to facing the first direction F1, it is equivalent to changing the vehicle body A200 from facing to the right to facing forward. Directly pulling the vehicle body A200 causes it to move the first positioning component A110, giving it a counter-clockwise rotation tendency. This allows the second sliding member A142 to move from point N' to point N'' within the first track segment A1311, and the first sliding member A141 to move synchronously from point M' to point M within the second track segment A1312 (switching from Figure 6 to Figure 5, and from Figure 9 to Figure 10). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, while simultaneously moving from the left edge towards the intersection center A133 relative to the second positioning component A120 (switching from Figure 18 to Figure 1). It should be noted that when the first slider A141 is located at the rotation axis and the second slider A142 is located in front of the first slider A141 along the front-back direction of the first positioning component A110, the switching process of the first positioning component A110 relative to the second positioning component A120 towards the first direction F1 and the second direction F2 is reversible, as is the switching process towards the second direction F2 and the third direction F3. At the same time, the switching process towards the third direction F3 and the fourth direction F4 is reversible, and the switching process towards the fourth direction F4 and the first direction F1 is also reversible. Based on the principle and process of the rotation and sliding of the first positioning component A110 relative to the second positioning component A120 described above, it can be known that when the first positioning component A110 rotates relative to the second positioning component A120 from the first direction F1 or the third direction F3 to the second direction F2 or the fourth direction F4, the first positioning component A110 can rotate relative to the second positioning component A120 to change its orientation, and at the same time, it can also retract inward relative to the second positioning component A120 to move away from the side door (see Figures 16 and 18). In this way, the vehicle body A200 connected to the first positioning component A110 can move away from the side door when facing the second direction F2 or the fourth direction F4 (see Figures 17 and 19). In other words, when the first positioning component A110 is oriented relative to the second positioning component A120 in either the second direction F2 or the fourth direction F4, the first positioning component A110 can retract inward relative to the second positioning component A120 to move away from the door, preventing the vehicle body A200 from hitting the door or interfering with it when rotating to a side position. Furthermore, the distance between the front end of the vehicle body A200 and the door is increased, providing more space for children to place their feet when riding in the side-positioned vehicle body A200. In addition, since there is no need to first turn and then retract laterally as in the traditional method, the ease of operation is improved. It should be noted that in the above embodiment, the intersection center A133 can be the geometric center of the second positioning component A120. The second positioning component A120 is symmetrically arranged with respect to the axis of the first track A131. In this way, when the first positioning component A110 is oriented towards the second direction F2 or the fourth direction F4, the first positioning component A110 can protrude or retract relative to the second positioning component A120 to one side (e.g., the left or right side). Referring to Figures 4 and 20, the third embodiment of the present invention provides a positioning component A100, which can also be regarded as a variation of the positioning component A100 in the first embodiment, the main difference being the different position of the second sliding member A142. Similarly, unless otherwise specified, the following mainly describes the differences between this embodiment and the first embodiment described above. Specifically, in the third embodiment, regarding the first positioning component A110, when the first slider A141 is located at the rotation axis, the second slider A142 can also be located to the left of the first slider A141 along the front-back direction of the first positioning component A110 (see Figures 9 and 20). This can be considered as the first positioning component A110 facing the first direction F1 relative to the second positioning component A120, and the first slider A141 located at the intersection center A133, with the second slider A142 located on one side of the first slider A141 along the second direction F2, i.e., the second slider A142 located on the third track segment A1321. Thus, the first positioning component A110 can rotate and slide relative to the second positioning component A120 by means of the sliding action of the first slider A141 along the first track A131 and the sliding action of the second slider A142 along the second track A132. The following, with reference to relevant diagrams, briefly explains the principle and process by which the first positioning component A110 in the positioning component A100 rotates and slides relative to the second positioning component A120 under the action of the sliding of the first sliding component A141 along the first track A131 and the sliding of the second sliding component A142 along the second track A132. Similarly, it should be noted that the relationship between the distance between the first slider A141 and the second slider A142 and the length of each track segment can be found in the first embodiment. Specifically, when the first slider A141 is located at the rotation axis and the second slider A142 is located to the left of the first slider A141, referring to Figure 5, when the first positioning component A110 is positioned relative to the second positioning component A120 facing the first direction F1, the first slider A141 is located at the intersection center A133, i.e., point M or point N', and the second slider A142 is located at the end of the third track segment A1321 away from the intersection center A133, i.e., point M'. When the user needs to switch the orientation of the first positioning component A110 relative to the second positioning component A120 from the first direction F1 to the second direction F2, as shown in Figures 4 and 20, the user can directly pull the vehicle body A200, causing the vehicle body A200 to move the first positioning component A110, so that the first positioning component A110 tends to rotate counterclockwise. In this way, the first sliding member A141 can move from point M (i.e., point N') to point N'' within the first track segment A1311, and at the same time, the second sliding member A142 can move synchronously from point M' to point M (i.e., point N') within the third track segment A1321 (switching from Figure 5 to Figure 21). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and simultaneously moves relative to the second positioning component A120 from the intersection center A133 along the front-rear direction of the vehicle (specifically, forward, in the first direction F1), so that the first positioning component A110 can protrude from the front edge of the second positioning component A120 along the first direction F1 (see Figure 21). When the first slider A141 moves to point N'', the second slider A142 is located at point M (i.e., point N'), which is the intersection center A133. At this time, the first positioning component A110 is facing the second direction F2 relative to the second positioning component A120, and the first positioning component A110 is pulled outward relative to the second positioning component A120 along the first direction F1. When the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the second direction F2 to facing the third direction F3, as shown in Figures 4 and 20, the user can pull the vehicle body A200, causing the vehicle body A200 to move the first positioning component A110, so that the first positioning component A110 has a counterclockwise rotation tendency. In this way, the second sliding member A142 can move from point M (i.e., point N') to point M'' within the fourth track segment A1322, and at the same time, the first sliding member A141 can move synchronously from point N'' to point M (i.e., point N') within the first track segment A1311 (switching from Figure 21 to Figure 5). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and at the same time, the first positioning component A110 moves relative to the second positioning component A120 from the front edge to the intersection center A133. When the second slider A142 moves to point M'', the first slider A141 is located at point M (i.e. point N'), which is the intersection center A133. At this time, the first positioning component A110 is oriented towards the third direction F3 relative to the second positioning component A120. Furthermore, when the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the third direction F3 to facing the fourth direction F4, as shown in Figures 4 and 20, the user pulls the vehicle body A200, causing the vehicle body A200 to move the first positioning component A110, so that the first positioning component A110 has a tendency to rotate counterclockwise. In this way, the first sliding member A141 can move from point M (i.e., point N') to point N within the second track segment A1312, and the second sliding member A142 can move synchronously from point M'' to point M (i.e., point N') within the fourth track segment A1322 (switching from Figure 5 to Figure 22). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and simultaneously moves relative to the second positioning component A120 from the intersection center A133 along the front-rear direction of the vehicle (specifically, it moves backward, in the third direction F3), so as to protrude beyond the rear end edge of the second positioning component A120 (see Figure 22). When the first slider A141 moves to point N, the second slider A142 is located at point M (i.e., N'), that is, at the intersection center A133. At this time, the first positioning component A110 is oriented relative to the second positioning component A120 in the fourth direction F4, and the first positioning component A110 is pulled outward relative to the second positioning component A120 along the third direction F3. Similarly, when the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the fourth direction F4 to facing the first direction F1, the user directly pulls the vehicle body A200, causing the vehicle body A200 to move the first positioning component A110, so that the first positioning component A110 has a counterclockwise rotation tendency. In this way, the second sliding member A142 can move from point M (i.e., point N') to point M' within the third track segment A1321, and the first sliding member A141 can move synchronously from point N to point M (i.e., point N') within the second track segment A1312 (switching from Figure 22 to Figure 5). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and at the same time, the first positioning component A110 moves relative to the second positioning component A120 from the rear edge to the intersection center A133. It should also be noted that when the first slider A141 is located at the rotation axis and the second slider A142 is located to the left of the first slider A141, the switching process of the first positioning component A110 relative to the second positioning component A120 towards the first direction F1 and the second direction F2 is reversible, as is the switching process towards the second direction F2 and the third direction F3. At the same time, the switching process towards the third direction F3 and the fourth direction F4 is reversible, and the switching process towards the fourth direction F4 and the first direction F1 is also reversible. Based on the principle and process of the rotation and sliding of the first positioning component A110 relative to the second positioning component A120 described above, when the first positioning component A110 rotates relative to the second positioning component A120 from the first direction F1 or the third direction F3 to the fourth direction F4, the first positioning component A110 can rotate relative to the second positioning component A120 to change its orientation, and at the same time, it can also move backward relative to the second positioning component A120 along the front-rear direction of the vehicle. Specifically, when the first positioning component A110 rotates relative to the second positioning component A120 from the first direction F1 or the third direction F3 to the second direction F2, the first positioning component A110 can rotate relative to the second positioning component A120 to change its orientation, and at the same time, it can also move forward relative to the second positioning component A120 along the driving direction of the vehicle (compare Figure 5 and Figure 21). Taking a seven-seater vehicle as an example, the rear door of the car is usually installed on the second row of seats. Thus, when the vehicle body A200 is installed on the third row of seats via the positioning component A100, the distance between the vehicle body A200 and the rear left door can be reduced when the vehicle body A200 is rotated with the first positioning component A110 to face the left, i.e., the second direction F2. This makes it convenient for the user to put the child into the vehicle body A200 or take the child out of the vehicle body A200 through the rear left door. Referring to Figures 4 and 23, the fourth embodiment of the present invention provides a positioning component A100, which can be considered a variation of the positioning component A100 in the third embodiment, the main difference being the position of the second sliding member A142. Similarly, unless otherwise specified, the following mainly describes the differences between this embodiment and the third embodiment described above. Specifically, in the fourth embodiment, regarding the first positioning component A110, when the first slider A141 is located at the rotation axis, the second slider A142 can also be located to the right of the first slider A141 along the front-back direction of the first positioning component A110 (see Figures 11 and 23). This can be considered as the first positioning component A110 facing the first direction F1 relative to the second positioning component A120, and the first slider A141 located at the intersection center A133, with the second slider A142 located on one side of the first slider A141 along the fourth direction F4, i.e., the second slider A142 located on the fourth track segment A1322. Thus, the first positioning component A110 can also rotate and slide relative to the second positioning component A120 by means of the sliding action of the first slider A141 along the first track A131 and the sliding action of the second slider A142 along the second track A132. The following, with reference to relevant diagrams, briefly explains the principle and process by which the first positioning component A110 in the positioning component A100 rotates and slides relative to the second positioning component A120 under the action of the sliding of the first sliding component A141 along the first track A131 and the sliding of the second sliding component A142 along the second track A132. Similarly, it should be noted that the relationship between the distance between the first slider A141 and the second slider A142 and the length of each track segment can be found in the first embodiment. Specifically, when the first slider A141 is located at the rotation axis and the second slider A142 is located to the right of the first slider A141, when the first positioning component A110 is positioned relative to the second positioning component A120 facing the first direction F1, the first slider A141 is located at the intersection center A133, i.e., point M or point N', and the second slider A142 is located at the end of the fourth track segment A1322 away from the intersection center A133, i.e., point M''. When the user needs to switch the orientation of the first positioning component A110 relative to the second positioning component A120 from the first direction F1 to the second direction F2, as shown in Figures 4 and 23, the user can pull the vehicle body A200, causing the vehicle body A200 to move the first positioning component A110, so that the first positioning component A110 tends to rotate counterclockwise. In this way, the first sliding member A141 can move from point M (i.e., point N') to point N within the second track segment A1312, and at the same time, the second sliding member A142 can move synchronously from point M'' to point M (i.e., point N') within the fourth track segment A1322 (switching from Figure 5 to Figure 22). It should be noted that the positioning component A100 shown in Figure 22 in this embodiment is slightly different from the positioning component A100 shown in Figure 22 in the third embodiment. The difference is that in this embodiment, when referring to Figure 22, the first positioning component A110 faces the second direction F2; while in the third embodiment, when referring to Figure 22, the first positioning component A110 faces the fourth direction F4. During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and can move relative to the second positioning component A120 from the intersection center A133 along the front-rear direction of the vehicle (specifically, it moves backward, in the third direction F3) to protrude from the rear end edge of the second positioning component A120 (see Figure 22). When the first slider A141 moves to point N, the second slider A142 is located at point M (i.e. point N'), which is the intersection center A133. At this time, the first positioning component A110 is oriented towards the second direction F2 relative to the second positioning component A120, and the first positioning component A110 is pulled outward along the third direction F3 relative to the second positioning component A120. When the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the second direction F2 to facing the third direction F3, as shown in Figures 4 and 23, the user can pull the vehicle body A200, causing the vehicle body A200 to move the first positioning component A110, so that the first positioning component A110 has a counterclockwise rotation tendency. In this way, the second sliding member A142 can move from point M (i.e., point N') to point M' within the third track segment A1321, and at the same time, the first sliding member A141 can move synchronously from point N to point M (i.e., point N') within the second track segment A1312 (switching from Figure 22 to Figure 5). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and at the same time, the first positioning component A110 moves relative to the second positioning component A120 from the rear edge to the intersection center A133. When the second slider A142 moves to point M', the first slider A141 is located at point M (i.e. point N'), which is the intersection center A133. At this time, the first positioning component A110 is oriented towards the third direction F3 relative to the second positioning component A120. Furthermore, when the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the third direction F3 to facing the fourth direction F4, as shown in Figures 4 and 23, the user pulls the vehicle body A200, causing the vehicle body A200 to move the first positioning component A110, so that the first positioning component A110 has a tendency to rotate counterclockwise. In this way, the first sliding member A141 can move from point M (i.e., point N') to point N'' within the first track segment A1311, and the second sliding member A142 can move synchronously from point M' to point M (i.e., point N') within the fourth track segment A1322 (switching from Figure 5 to Figure 21). Similarly, the positioning component A100 shown in FIG21 in this embodiment is slightly different from the positioning component A100 shown in FIG21 in the third embodiment. The difference is that in this embodiment, when referring to FIG21, the first positioning component A110 faces the fourth direction F4; while in the third embodiment, when referring to FIG21, the first positioning component A110 faces the second direction F2. During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and at the same time, it can move in the front-rear direction of the vehicle (specifically, forward, in the first direction F1) relative to the second positioning component A120 from the intersection center A133, so that the first positioning component A110 can protrude from the front edge of the second positioning component A120 in the first direction F1 (see FIG21). When the first slider A141 moves to point N'', the second slider A142 is located at point M (i.e. point N'), which is the intersection center A133. At this time, the first positioning component A110 is oriented in the fourth direction F4 relative to the second positioning component A120, and the first positioning component A110 is pulled outward along the first direction F1 relative to the second positioning component A120. Similarly, when the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the fourth direction F4 to facing the first direction F1, the user directly pulls the vehicle body A200, causing the vehicle body A200 to move the first positioning component A110, so that the first positioning component A110 has a counterclockwise rotation tendency. In this way, the second sliding member A142 can move from point M (i.e., point N') to point M'' within the fourth track segment A1322, so that the first sliding member A141 moves synchronously from point N'' to point M (i.e., point N') within the first track segment A1311 (switching from Figure 21 to Figure 5). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and at the same time, the first positioning component A110 moves relative to the second positioning component A120 from the front edge to the intersection center A133. It should also be noted that when the first slider A141 is located at the rotation axis and the second slider A142 is located to the right of the first slider A141, the switching process of the first positioning component A110 relative to the second positioning component A120 towards the first direction F1 and the second direction F2 is reversible, as is the switching process towards the second direction F2 and the third direction F3. At the same time, the switching process towards the third direction F3 and the fourth direction F4 is reversible, and the switching process towards the fourth direction F4 and the first direction F1 is also reversible. Based on the principle and process of the rotation and sliding of the first positioning component A110 relative to the second positioning component A120 described above, when the first positioning component A110 rotates relative to the second positioning component A120 from the first direction F1 or the third direction F3 to the second direction F2, the first positioning component A110 can rotate relative to the second positioning component A120 to change its orientation, and at the same time, it can also move backward relative to the second positioning component A120 along the front-rear direction of the vehicle. Specifically, when the first positioning component A110 rotates relative to the second positioning component A120 from the first direction F1 or the third direction F3 to the fourth direction F4, the first positioning component A110 can rotate relative to the second positioning component A120 to change its orientation, and at the same time, it can also move forward relative to the second positioning component A120 along the driving direction of the vehicle (compare Figure 5 and Figure 21). Similarly, taking a seven-seater vehicle as an example, when the vehicle body A200 is installed on the third row of seats through the positioning component A100, when the vehicle body A200 rotates with the first positioning component A110 to face the right, i.e., the fourth direction F4, the distance between the vehicle body A200 and the rear right door can be reduced. This makes it convenient for users to put children into the vehicle body A200 or take children out of the vehicle body A200 at the rear right door. As described above, in the first to fourth embodiments, when the first slider A141 is positioned at the rotation axis, the second slider A142 can be positioned in front of, behind, to the left of, and to the right of the first positioning component A110 along the front-back direction. In each embodiment, the first positioning component A110 can slide while rotating relative to the second positioning component A120. This improves the convenience of user operation. Referring to Figures 24 and 25, the fifth embodiment of the present invention provides a positioning component A100, which can be considered a variation of the positioning component A100 of the first embodiment described above. The positioning component A100 in this embodiment also includes a first positioning component A110 and a second positioning component A120. The main difference from the positioning component A100 in the first embodiment is that, in this embodiment, the first positioning component A110 is provided with a first track A131 and a second track A132, and the second positioning component A120 is provided with a first sliding member A141 and a second sliding member A142. The first positioning component A110 also rotates and slides relative to the second positioning component A120 by means of the first sliding member A141 sliding along one of the first track A131 or the second track A132 and the second sliding member A142 sliding along the other of the first track A131 or the second track A132. Therefore, without conflict, the structure and connection relationship of the first positioning component A110 and the second positioning component A120 in this embodiment can be referred to the description in the first embodiment above. The following mainly describes the differences between this embodiment and the first embodiment above. It should be noted that in the positioning component A100 in this embodiment, the extension directions of the first track A131 and the second track A132 will change relative to each other during the rotation and sliding process with the first positioning component A110 (see the description below). In addition, it should be noted that in this embodiment, the first positioning component A110 can also be oriented relative to the second positioning component A120 in the first direction F1, the second direction F2, the third direction F3, and the fourth direction F4. The first direction F1, the second direction F2, the third direction F3, and the fourth direction F4 are the same as the first direction F1, the second direction F2, the third direction F3, and the fourth direction F4 referred to in the first embodiment above, that is, they can be regarded as the front of the car, the rear of the car, the left side of the car, and the right side of the car, respectively. Specifically, in the positioning component A100 provided in the fifth embodiment, as shown in FIG24, the first positioning component A110 is provided with a first track A131 and a second track A132. The first track segment A1311 extends forward from the intersection center A133 along the front-back direction of the first positioning component A110, that is, along the Q1 direction; the second track segment A1312 extends backward from the intersection center A133 along the front-back direction of the first positioning component A110, that is, along the Q3 direction; the third track segment A1321 extends to the left from the intersection center A133 along the left-right direction of the first positioning component A110, that is, along the Q2 direction; and the fourth track segment A1322 extends to the right from the intersection center A133 along the left-right direction of the first positioning component A110, that is, along the Q4 direction. As shown in FIG25, the second positioning component A120 is provided with a first sliding member A141 and a second sliding member A142. The second positioning component A120 has a positioning axis, the first slider A141 is coaxially arranged with the positioning axis, and the second slider A142 is offset from the positioning axis. For example, the second slider A142 is located on the side of the first slider A141 along the third direction F3. Specifically, the positioning axis can be the geometric center of the second positioning component A120. To better understand the setting position of the second slider A142 relative to the first slider A141 in the fifth embodiment, similarly to the first embodiment, the setting position of the second slider A142 will be described below with reference to the first positioning component A110 relative to the second positioning component A120 facing the first direction F1. Specifically, in the fifth embodiment, regarding the second positioning component A120, when the first slider A141 is located at the positioning axis, the second slider A142 can be located behind the first slider A141 (see Figure 25), that is, the second slider A142 is located on the side of the first slider A141 along the third direction F3. When the first positioning component A110 is oriented towards the first direction F1 relative to the second positioning component A120, as shown in Figure 26, the first track segment A1311 can be considered to extend from the intersection center A133 towards the first direction F1, the second track segment A1312 can be considered to extend from the intersection center A133 towards the third direction F3, the third track segment A1321 can be considered to extend from the intersection center A133 towards the second direction F2, and the fourth track segment A1322 can be considered to extend from the intersection center A133 towards the fourth direction F4. At this time, the first slider A141 is located at the intersection center A133, and the second slider A142 is located at the second track segment A1312. In this way, the first positioning component A110 rotates and slides relative to the second positioning component A120 by means of the sliding of the first slider A141 along the second track A132 and the sliding of the second slider A142 along the first track A131. The following, with reference to relevant diagrams, briefly explains the principle and process by which the first positioning component A110 in the positioning component A100 rotates and slides relative to the second positioning component A120 when the first sliding member A141 is located at the positioning axis of the second positioning component A120 and the second sliding member A142 is located behind the first sliding member A141, with the help of the sliding of the first sliding member A141 along the second track A132 and the sliding of the second sliding member A142 along the first track A131. In the positioning component A100 provided in the fifth embodiment, as shown in FIG24, the first positioning component A110 may include a first top cover A111 and a first bottom cover A112. The first top cover A111 and the first bottom cover A112 are connected vertically to form a first mounting cavity (not shown in the figure). FIG26 to FIG29 show top views of the positioning component A100 when the first positioning component A110 is oriented in different directions relative to the second positioning component A120. In order to clearly understand the principle of the first positioning component A110 rotating and sliding relative to the second positioning component A120, the first positioning component A110 shown in FIG26 to FIG29 only retains the first bottom cover A112. As shown in Figures 25 and 26, when the first slider A141 is positioned at the positioning axis of the second positioning component A120, and the second slider A142 is positioned behind the first slider A141 along the first direction F1, when the first positioning component A110 is positioned relative to the second positioning component A120 and facing the first direction F1, the first slider A141 is located at the intersection center A133, i.e., point M or point N', and the second slider A142 is located at the end of the second track segment A1312 away from the intersection center A133, i.e., point N. When the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the first direction F1 to facing the second direction F2, it is equivalent to changing the vehicle body A200 from facing forward to facing left. As shown in Figures 24 and 25, the user can directly pull the vehicle body A200, causing the vehicle body A200 to move the first positioning component A110, so that the first positioning component A110 has a counterclockwise rotation tendency. In this way, the first track A131 and the second track A132 will rotate simultaneously with the first positioning component A110, so that the position of the first slider A141 relative to the first positioning component A110 in the fourth track segment A1322 can be switched from point M to point M'', and at the same time, the position of the second slider A142 relative to the first positioning component A110 in the second track segment A1312 can be switched from point N to point N' (from Figure 26 to Figure 27). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and can simultaneously move back and forth relative to the second positioning component A120 along the front-rear direction of the vehicle (specifically, it moves backward, along the third direction F3), so as to protrude beyond the rear end edge of the second positioning component A120 (see Figure 27). When the first slider A141 moves relative to point M'', the second slider A142 is located at point N', i.e., at the intersection center A133. At this time, the first positioning component A110 is oriented towards the second direction F2 relative to the second positioning component A120, and the first positioning component A110 is pulled outward relative to the second positioning component A120 along the third direction F3. It should be noted that when the first positioning component A110 rotates to face the second direction F2, as shown in Figure 27, the first track segment A1311 can be regarded as extending from the intersection center A133 to the second direction F2, the second track segment A1312 can be regarded as extending from the intersection center A133 to the fourth direction F4, the third track segment A1321 can be regarded as extending from the intersection center A133 to the third direction F3, and the fourth track segment A1322 can be regarded as extending from the intersection center A133 to the first direction F1. When the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the second direction F2 to facing the third direction F3, it is equivalent to changing the vehicle body A200 from facing left to facing rear, as shown in Figures 24 and 25. The user can directly pull the vehicle body A200, causing the vehicle body A200 to move the first positioning component A110, so that the first positioning component A110 has a counterclockwise rotation tendency. In this way, the first track A131 and the second track A132 will rotate simultaneously with the first positioning component A110, so that the position of the second slider A142 relative to the first positioning component A110 in the first track segment A1311 can be switched from point N' to point N''. At the same time, the position of the first slider A141 relative to the first positioning component A110 in the fourth track segment A1322 is switched synchronously from point M'' to point M (from Figure 27 to Figure 28). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and simultaneously moves back and forth relative to the second positioning component A120 along the front-rear direction of the vehicle (specifically, it moves from the rear edge of the second positioning component A120 towards the position of the first sliding member A141, i.e., along the first direction F1). Thus, when the first positioning component A110 rotates relative to the second positioning component A120 to the third direction F3, its orthographic projection position on the second positioning component A120 is the same as the orthographic projection position on the second positioning component A120 when the first positioning component A110 rotates relative to the second positioning component A120 to the first direction F1 (see Figures 26 and 28). When the second sliding member A142 moves relative to point N'', the first sliding member A141 is located at point M, i.e., the intersection center A133. At this time, the first positioning component A110 is facing the third direction F3 relative to the second positioning component A120. It should be noted that when the first positioning component A110 rotates to face the third direction F3, as shown in Figure 28, the first track segment A1311 can be regarded as extending from the intersection center A133 to the third direction F3, the second track segment A1312 can be regarded as extending from the intersection center A133 to the first direction F1, the third track segment A1321 can be regarded as extending from the intersection center A133 to the fourth direction F4, and the fourth track segment A1322 can be regarded as extending from the intersection center A133 to the second direction F2. Furthermore, when the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the third direction F3 to facing the fourth direction F4, it is equivalent to changing the vehicle body A200 from facing rearward to facing rightward, as shown in Figures 24 and 25. Pulling the vehicle body A200 causes the vehicle body A200 to move the first positioning component A110, so that the first positioning component A110 has a tendency to rotate counterclockwise. In this way, the first track A131 and the second track A132 will rotate simultaneously with the first positioning component A110, so that the position of the first slider A141 relative to the first positioning component A110 in the third track segment A1321 can be switched from point M to point M', and the position of the second slider A142 relative to the first positioning component A110 in the first track segment A1311 can be switched from point N'' to point N' (from Figure 28 to Figure 29). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and can simultaneously move back and forth relative to the second positioning component A120 along the front-rear direction of the vehicle (specifically, it moves backward, i.e., along the third direction F3), to protrude beyond the rear end edge of the second positioning component A120 (see Figure 29). When the first slider A141 moves relative to point M', the second slider A142 is located at point N', i.e., at the intersection center A133. At this time, the first positioning component A110 is oriented relative to the second positioning component A120 in the fourth direction F4, and the first positioning component A110 is pulled outward relative to the second positioning component A120 along the third direction F3. It should be noted that when the first positioning component A110 rotates to face the fourth direction F4, as shown in Figure 29, the first track segment A1311 can be regarded as extending from the intersection center A133 to the fourth direction F4, the second track segment A1312 can be regarded as extending from the intersection center A133 to the second direction F2, the third track segment A1321 can be regarded as extending from the intersection center A133 to the first direction F1, and the fourth track segment A1322 can be regarded as extending from the intersection center A133 to the third direction F3. Similarly, when the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the fourth direction F4 to facing the first direction F1, it is equivalent to changing the vehicle body A200 from facing the right to facing forward. By directly pulling the vehicle body A200, the vehicle body A200 moves the first positioning component A110, causing the first positioning component A110 to rotate counterclockwise. In this way, the first track A131 and the second track A132 will rotate simultaneously with the first positioning component A110, allowing the second slider A142 to switch its position relative to the first positioning component A110 in the second track segment A1312 from point N' to point N. Simultaneously, the first slider A141 can switch its position relative to the first positioning component A110 in the first track segment A1311 from point M' to point M (from Figure 29 to Figure 26). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and at the same time, it can move back and forth relative to the second positioning component A120 along the front-rear direction of the car (specifically, it moves from the rear edge of the second positioning component A120 to the position of the first sliding member A141, that is, it moves along the first direction F1) to reset. Similarly, it should be noted that when the first slider A141 is located at the positioning axis of the second positioning component A120 and the second slider A142 is located behind the first slider A141, the switching process of the first positioning component A110 relative to the second positioning component A120 towards the first direction F1 and the second direction F2 is reversible, as is the switching process towards the second direction F2 and the third direction F3, the switching process towards the third direction F3 and the fourth direction F4, and the switching process towards the fourth direction F4 and the first direction F1 is also reversible. Similarly, it should be noted that the above description uses the example of the first positioning component A110 rotating one full circle counterclockwise relative to the second positioning component A120 to illustrate the principle of sliding while rotating. Of course, the principle of sliding while rotating can also be illustrated using the example of the first positioning component A110 rotating one full circle clockwise relative to the second positioning component A120, which will not be elaborated here. Referring to Figures 24 and 30, the sixth embodiment of the present invention provides a positioning component A100, which can be considered a variation of the positioning component A100 in the fifth embodiment, the main difference being the position of the second sliding member A142. Therefore, unless otherwise specified, the following mainly describes the differences between this embodiment and the fifth embodiment described above. Specifically, in the sixth embodiment, regarding the second positioning component A120, when the first slider A141 is located at the positioning axis, the second slider A142 can also be located in front of the first slider A141 (see Figure 30), that is, the second slider A142 is located on one side of the first slider A141 along the first direction F1. When the first positioning component A110 faces the first direction F1 relative to the second positioning component A120, the first slider A141 is located at the intersection center A133, and the second slider A142 is located at the first track segment A1311. In this way, the first positioning component A110 can also rotate and slide relative to the second positioning component A120 by means of the sliding of the first slider A141 along the second track A132 and the sliding of the second slider A142 along the first track A131. The following, with reference to relevant diagrams, briefly explains the principle and process by which the first positioning component A110 in the positioning component A100 rotates and slides relative to the second positioning component A120 when the first sliding member A141 is located at the positioning axis of the second positioning component A120 and the second sliding member A142 is located in front of the first sliding member A141, with the help of the sliding of the first sliding member A141 along the second track A132 and the sliding of the second sliding member A142 along the first track A131. Specifically, when the first slider A141 is located at the positioning axis of the second positioning component A120 and the second slider A142 is located in front of the first slider A141, when the first positioning component A110 is positioned relative to the second positioning component A120 and facing the first direction F1, the first slider A141 is located at the intersection center A133, i.e., point M or point N', and the second slider A142 is located at the end of the first track segment A1311 away from the intersection center A133, i.e., point N'' (see Figure 26). When the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the first direction F1 to facing the second direction F2, it is equivalent to changing the orientation of the vehicle body A200 from facing forward to facing left. As shown in Figures 24 and 30, the user can pull the vehicle body A200, causing it to move the first positioning component A110, resulting in a counter-clockwise rotation of the first positioning component A110. This causes the first track A131 and the second track A132 to rotate simultaneously with the first positioning component A110, allowing the first slider A141 to switch its position relative to the first positioning component A110 within the second track segment A1312 from point M to point M'. Simultaneously, the second slider A142 can switch its position relative to the first positioning component A110 within the first track segment A1311 from point N'' to point N' (from Figure 26 to Figure 31). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and simultaneously moves relative to the second positioning component A120 in the front-rear direction of the vehicle (specifically, forward, in the first direction F1), so that the first positioning component A110 protrudes from the front edge of the second positioning component A120 along the first direction F1 (see Figure 31). When the first slider A141 moves to point M', the second slider A142 is located at point N', i.e., the intersection center A133. At this time, the first positioning component A110 faces the second direction F2 relative to the second positioning component A120, and the first positioning component A110 is pulled outward relative to the second positioning component A120 along the first direction F1. When the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the second direction F2 to facing the third direction F3, it is equivalent to changing the vehicle body A200 from facing left to facing rear, as shown in Figures 24 and 30. The user can directly pull the vehicle body A200, causing the vehicle body A200 to move the first positioning component A110, so that the first positioning component A110 has a counterclockwise rotation tendency. In this way, the first track A131 and the second track A132 will rotate simultaneously with the first positioning component A110, so that the position of the second slider A142 in the second track segment A1312 changes from point N' to point N. At the same time, the position of the first slider A141 in the third track segment A1321 changes synchronously from point M' to point M (from Figure 31 to Figure 28). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and simultaneously moves relative to the second positioning component A120 along the front-rear direction of the vehicle (specifically, it moves from the front edge of the second positioning component A120 towards the position of the first sliding member A141, in the third direction F3). Thus, when the first positioning component A110 rotates relative to the second positioning component A120 to the third direction F3, its orthographic projection position on the second positioning component A120 is the same as its orthographic projection position on the second positioning component A120 when it rotates relative to the second positioning component A120 to the first direction F1 (see Figures 26 and 28). When the second sliding member A142 moves to point N, the first sliding member A141 is located at point M, i.e., the intersection center A133. At this time, the first positioning component A110 is facing the third direction F3 relative to the second positioning component A120. Furthermore, when the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the third direction F3 to facing the fourth direction F4, it is equivalent to changing the vehicle body A200 from facing rearward to facing rightward, as shown in Figures 24 and 30. Pulling the vehicle body A200 causes the vehicle body A200 to move the first positioning component A110, so that the first positioning component A110 has a counterclockwise rotation tendency. In this way, the first track A131 and the second track A132 will rotate simultaneously with the first positioning component A110, so that the position of the first slider A141 in the fourth track segment A1322 changes from point M to point M'', and the position of the second slider A142 in the second track segment A1312 changes simultaneously from point N to point N' (from Figure 28 to Figure 32). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and simultaneously moves back and forth relative to the second positioning component A120 along the longitudinal direction of the vehicle (specifically, forward, in the first direction F1), so that the first positioning component A110 protrudes from the front edge of the second positioning component A120 along the first direction F1 (see Figure 32). When the first slider A141 moves relative to M'', the second slider A142 is located at point N', i.e., the intersection center A133. At this time, the first positioning component A110 faces the fourth direction F4 relative to the second positioning component A120, and the first positioning component A110 is pulled outward relative to the second positioning component A120 along the first direction F1. Similarly, when the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the fourth direction F4 to facing the first direction F1, it is equivalent to changing the vehicle body A200 from facing the right to facing forward. By directly pulling the vehicle body A200, the vehicle body A200 moves the first positioning component A110, causing the first positioning component A110 to rotate counterclockwise. In this way, the first track A131 and the second track A132 will rotate simultaneously with the first positioning component A110, causing the position of the second slider A142 in the first track segment A1311 to switch from point N' to point N'', and causing the position of the first slider A141 in the second track segment A1312 to switch from point M'' to point M (from 32 to Figure 26). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and at the same time, it can move back and forth relative to the second positioning component A120 in the front-rear direction of the car (specifically, it moves from the front edge of the second positioning component A120 towards the position of the first sliding member A141, and then in the third direction F3) to reset. Similarly, when the first slider A141 is located at the positioning axis of the second positioning component A120 and the second slider A142 is located in front of the first slider A141, the switching process of the first positioning component A110 relative to the second positioning component A120 towards the first direction F1 and the second direction F2 is reversible, the switching process towards the second direction F2 and the third direction F3 is reversible, the switching process towards the third direction F3 and the fourth direction F4 is reversible, and the switching process towards the fourth direction F4 and the first direction F1 is also reversible. Based on the principle and process of the rotation and sliding of the first positioning component A110 relative to the second positioning component A120 described above, it can be known that when the first positioning component A110 rotates relative to the second positioning component A120 to face the second direction F2, the first positioning component A110 can move forward relative to the second positioning component A120 along the driving direction of the vehicle (see Figures 31 and 32). Taking a seven-seater vehicle as an example, the rear door of the vehicle is usually installed on the second row of seats. Thus, for example, when the vehicle body A200 is installed on the third row of seats through the positioning component A100, when the vehicle body A200 rotates with the first positioning component A110 to face the left or right, i.e., the second direction F2 or the fourth direction F4, the distance between the vehicle body A200 and the rear door can be reduced. This makes it convenient for the user to put a child into the vehicle body A200 or take a child out of the vehicle body A200 at the rear door. Referring to Figures 24 and 33, the seventh embodiment of the present invention provides a positioning component A100, which can be considered a variation of the positioning component A100 in the fifth embodiment, the main difference being the position of the second sliding member A142. Therefore, unless otherwise specified, the following mainly describes the differences between this embodiment and the fifth embodiment described above. Specifically, in the seventh embodiment, regarding the second positioning component A120, when the first slider A141 is positioned at the positioning axis, the second slider A142 can be positioned to the left of the first slider A141 (see Figure 33), that is, the second slider A142 is located on the side of the first slider A141 along the second direction F2. When the first positioning component A110 is oriented towards the first direction F1 relative to the second positioning component A120, the first slider A141 is located at the intersection center A133, and at this time, the second slider A142 is located at the third track segment A1321. In this way, the first positioning component A110 can rotate and slide relative to the second positioning component A120 by means of the sliding of the first slider A141 along the first track A131 and the sliding of the second slider A142 along the second track A132. The following, with reference to relevant diagrams, briefly explains the principle and process by which the first positioning component A110 in the positioning component A100 rotates and slides relative to the second positioning component A120 when the first sliding member A141 is located at the positioning axis of the second positioning component A120 and the second sliding member A142 is located to the left of the first sliding member A141 (i.e., the second sliding member A142 is located on the side of the first sliding member A141 along the second direction F2). Specifically, when the first slider A141 is located at the positioning axis of the second positioning component A120, and the second slider A142 is located to the left of the first slider A141 along the first direction F1, when the first positioning component A110 is positioned relative to the second positioning component A120 and facing the first direction F1, the first slider A141 is located at the intersection center A133, i.e., point M or point N', and the second slider A142 is located at the end of the third track segment A1321 away from the intersection center A133, i.e., point M'. When the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the first direction F1 to facing the second direction F2, it is equivalent to changing the orientation of the vehicle body A200 from facing forward to facing left. As shown in Figures 24 and 33, the user can directly pull the vehicle body A200, causing it to move the first positioning component A110, resulting in a counter-clockwise rotation of the first positioning component A110. This causes the first track A131 and the second track A132 to rotate simultaneously with the first positioning component A110, switching the position of the first slider A141 within the third track segment A1321 from point M (i.e., point N') to point N. Simultaneously, the position of the second slider A142 within the third track segment A1321 also switches synchronously from point M' to point M (i.e., point N') (from Figure 26 to Figure 34). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and simultaneously moves laterally relative to the second positioning component A120 along the longitudinal direction of the vehicle (specifically, along the left side, the second direction F2), protruding beyond the left edge of the second positioning component A120 (see Figure 34), i.e., pulling out to the left. When the first slider A141 moves to point N, the second slider A142 is located at point M (i.e., point N'), i.e., at the intersection center A133. At this time, the first positioning component A110 is oriented relative to the second positioning component A120 in the second direction F2, and the first positioning component A110 is pulled outward relative to the second positioning component A120 along the second direction F2. When the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the second direction F2 to facing the third direction F3, it is equivalent to changing the vehicle body A200 from facing the left to facing the rear, as shown in Figures 24 and 33. The user can pull the vehicle body A200, causing the vehicle body A200 to move the first positioning component A110, so that the first positioning component A110 has a counterclockwise rotation tendency. In this way, the first track A131 and the second track A132 will rotate simultaneously with the first positioning component A110, so that the position of the second slider A142 in the fourth track segment A1322 changes from point M (i.e., point N') to point M''. At the same time, the position of the first slider A141 in the second track segment A1312 changes synchronously from point N to point M (i.e., point N') (from Figure 34 to 28). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120. Simultaneously, the first positioning component A110 moves from a lateral direction (specifically, to the left) relative to the second positioning component A120 towards the position of the first sliding member A141 (i.e., towards the positioning axis). When the second sliding member A142 moves to point M'', the first sliding member A141 is located at point M (i.e., point N'), which is the intersection center A133. At this time, the first positioning component A110 is oriented towards a third direction F3 relative to the second positioning component A120. Furthermore, when the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the third direction F3 to facing the fourth direction F4, it is equivalent to changing the vehicle body A200 from facing rearward to facing rightward, as shown in Figures 24 and 33. Pulling the vehicle body A200 causes the vehicle body A200 to move the first positioning component A110, so that the first positioning component A110 has a counterclockwise rotation tendency. In this way, the first track A131 and the second track A132 will rotate simultaneously with the first positioning component A110, so that the first slider A141 switches from point M (i.e., point N') to point N'' within the first track segment A1311, and the second slider A142 synchronously switches from point M'' to point M (i.e., point N') within the fourth track segment A1322 (switching from Figure 28 to Figure 35). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and simultaneously moves laterally relative to the second positioning component A120 along the front-rear direction of the vehicle (specifically, along the left side, the second direction F2), so as to retract relative to the right edge of the second positioning component A120 and protrude beyond the left edge (see Figure 35), that is, retracting inward along the right side. When the first slider A141 moves to point N'', the second slider A142 is located at point M (i.e., point N'), that is, at the intersection center A133. At this time, the first positioning component A110 is oriented relative to the second positioning component A120 in the fourth direction F4, and the first positioning component A110 retracts inward relative to the second positioning component A120 along the fourth direction F4. Similarly, when the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the fourth direction F4 to facing the first direction F1, it is equivalent to changing the vehicle body A200 from facing the right to facing forward. Directly pulling the vehicle body A200 will cause the vehicle body A200 to move the first positioning component A110, so that the first positioning component A110 has a counterclockwise rotation tendency. In this way, the first track A131 and the second track A132 will rotate simultaneously with the first positioning component A110, so that the position of the second slider A142 in the third track segment A1321 will switch from point M (i.e., point N') to point M', and the position of the first slider A141 in the first track segment A1311 will switch from point N'' to point M (i.e., point N') simultaneously (from Figure 35 to 26). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and at the same time, the first positioning component A110 moves from the lateral direction (specifically the left side direction) relative to the second positioning component A120 towards the position of the first sliding member A141 (which can be regarded as the positioning axis). Similarly, when the first slider A141 is located at the rotation axis of the second positioning component A120 and the second slider A142 is located to the left of the first slider A141, the switching process of the first positioning component A110 relative to the second positioning component A120 towards the first direction F1 and the second direction F2 is reversible, the switching process towards the second direction F2 and the third direction F3 is reversible, the switching process towards the third direction F3 and the fourth direction F4 is reversible, and the switching process towards the fourth direction F4 and the first direction F1 is also reversible. Based on the principle and process of the first positioning component A110 rotating and sliding relative to the second positioning component A120 as described above, it can be known that when the first positioning component A110 rotates relative to the second positioning component A120 from the first direction F1 or the third direction F3 to the direction of the second direction F2 or the fourth direction F4, the first positioning component A110 can rotate relative to the second positioning component A120 to change its orientation, and at the same time, it can also be pulled outward along the second direction F2 or retracted inward along the fourth direction F4 relative to the second positioning component A120. In some embodiments, the first track segment A1311 can be selectively cancelled, that is, the first track A131 only includes the second track segment A1312. In this case, when the first positioning component A110 rotates relative to the second positioning component A120 from the first direction F1 or the third direction F3 to the direction F2, the first positioning component A110 can be pulled outward relative to the second positioning component A120 along the second direction F2. In this way, the vehicle body A200 connected to the first positioning component A110 can be closer to the door when it rotates with the first positioning component A110 to the second direction F2, thereby making it convenient for the user to take the child out of the vehicle body A200 or put the child into the vehicle body A200. Similarly, in some other embodiments, the second track segment A1312 can be selectively omitted, that is, the first track A131 only includes the first track segment A1311. In this case, when the first positioning component A110 rotates relative to the second positioning component A120 from the first direction F1 or the third direction F3 to the fourth direction F4, the first positioning component A110 can rotate relative to the second positioning component A120 to change its orientation, and at the same time, it can also retract inward relative to the second positioning component A120 along the fourth direction F4 to move away from the door. When a child is riding in the vehicle body A200 which is set to the side (specifically, facing the right door), this can prevent the child from hitting the door when turning to the side-facing use state, and also provide more space for placing feet in the side-facing use state. In addition, since it is not necessary to turn first and then perform the operation of pulling outward or pushing inward laterally as in the traditional way, the convenience of operation is improved. Referring to Figures 24 and 36, the eighth embodiment of the present invention provides a positioning component A100, which can be considered a variation of the positioning component A100 in the fifth embodiment, the main difference being the position of the second sliding member A142. Therefore, unless otherwise specified, the following mainly describes the differences between this embodiment and the fifth embodiment described above. Specifically, in the eighth embodiment, regarding the second positioning component A120, when the first slider A141 is located at the positioning axis, the second slider A142 can also be located to the right of the first slider A141 (see Figure 36), that is, the second slider A142 is located on the side of the first slider A141 along the fourth direction F4. When the first positioning component A110 is oriented towards the first direction F1 relative to the second positioning component A120, the first slider A141 is located at the intersection center A133, and the second slider A142 is located at the fourth track segment A1322. In this way, the first positioning component A110 can also rotate and slide relative to the second positioning component A120 by means of the sliding action of the first slider A141 along the first track A131 and the sliding action of the second slider A142 along the second track A132. The following, with reference to relevant diagrams, briefly explains the principle and process by which the first positioning component A110 in the positioning component A100 rotates and slides relative to the second positioning component A120 when the first sliding member A141 is located at the positioning axis of the second positioning component A120 and the second sliding member A142 is located to the right of the first sliding member A141 (i.e., the second sliding member A142 is located on the side of the first sliding member A141 along the fourth direction F4). Specifically, when the first slider A141 is located at the positioning axis of the second positioning component A120, and the second slider A142 is located to the right of the first slider A141, when the first positioning component A110 is positioned relative to the second positioning component A120 and facing the first direction F1, the first slider A141 is located at the intersection center A133, i.e., point M or point N', and the second slider A142 is located at the end of the fourth track segment A1322 away from the intersection center A133, i.e., point M'' (see Figure 26). When the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the first direction F1 to facing the second direction F2, it is equivalent to changing the orientation of the vehicle body A200 from facing forward to facing left. As shown in Figures 24 and 36, the user can directly pull the vehicle body A200, causing it to move the first positioning component A110, resulting in a counter-clockwise rotation of the first positioning component A110. This causes the first track A131 and the second track A132 to rotate simultaneously with the first positioning component A110, switching the position of the first slider A141 within the first track segment A1311 from point M or N' to point N''. Simultaneously, the position of the second slider A142 within the fourth track segment A1322 changes synchronously from point M'' to point M or N' (from Figure 26 to Figure 37). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and simultaneously moves laterally relative to the second positioning component A120 along the front-rear direction of the vehicle (specifically, along the right side, the fourth direction F4), so as to retract relative to the left edge of the second positioning component A120 and protrude beyond the right edge (see Figure 37), that is, retracting inward along the left side. When the first slider A141 moves to point N'', the second slider A142 is located at point M or point N', that is, at the intersection center A133. At this time, the first positioning component A110 is oriented relative to the second positioning component A120 in the second direction F2, and the first positioning component A110 retracts inward relative to the second positioning component A120 along the second direction F2. When the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the second direction F2 to facing the third direction F3, it is equivalent to changing the vehicle body A200 from facing left to facing rear, as shown in Figures 24 and 36. The user can pull the vehicle body A200, causing the vehicle body A200 to move the first positioning component A110, so that the first positioning component A110 has a counterclockwise rotation tendency. In this way, the first track A131 and the second track A132 will rotate simultaneously with the first positioning component A110, so that the position of the second slider A142 in the third track segment A1321 changes from point M or N' to point M'. At the same time, the position of the first slider A141 in the first track segment A1311 changes synchronously from point N'' to point M or N' (from Figure 37 to Figure 28). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120. Simultaneously, the first positioning component A110 moves relative to the second positioning component A120 from a lateral direction (specifically, the right side) towards the position of the first sliding member A141 (i.e., towards the positioning axis). Thus, when the first positioning component A110 rotates relative to the second positioning component A120 to a third direction F3, its orthographic projection onto the second positioning component A120 is at the same position as its orthographic projection relative to the second positioning component A120 rotating to a first direction F1. When the second sliding member A142 moves relative to point M', the first sliding member A141 is located at point M or point N', i.e., the intersection center A133. At this time, the first positioning component A110 is oriented relative to the second positioning component A120 towards the third direction F3. Furthermore, when the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing a third direction F3 to facing a fourth direction F4, it is equivalent to changing the vehicle body A200 from facing rearward to facing rightward, as shown in Figures 24 and 36. Pulling the vehicle body A200 causes the vehicle body A200 to move the first positioning component A110, so that the first positioning component A110 has a counterclockwise rotation tendency. In this way, the first track A131 and the second track A132 will rotate simultaneously with the first positioning component A110, so that the position of the first slider A141 in the second track segment A1312 changes from point M or N' to point N, and the position of the second slider A142 in the third track segment A1321 changes from point M' to point M or N' (from Figure 28 to Figure 38). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120, and simultaneously moves laterally relative to the second positioning component A120 along the front-rear direction of the vehicle (specifically, along the right side, i.e., the fourth direction F4), so as to protrude relative to the right edge of the second positioning component A120 (see Figure 38), i.e., pull out to the right. When the first slider A141 moves to point N, the second slider A142 is located at point M or point N', i.e., at the intersection center A133. At this time, the first positioning component A110 is oriented relative to the second positioning component A120 in the fourth direction F4, and the first positioning component A110 is pulled outward relative to the second positioning component A120 along the fourth direction F4. Similarly, when the user needs to switch the first positioning component A110 relative to the second positioning component A120 from facing the fourth direction F4 to facing the first direction F1, it is equivalent to changing the vehicle body A200 from facing to the right to facing forward. Directly pulling the vehicle body A200 will cause the vehicle body A200 to move the first positioning component A110, so that the first positioning component A110 has a counterclockwise rotation tendency. In this way, the first track A131 and the second track A132 will rotate simultaneously with the first positioning component A110, so that the position of the second slider A142 in the fourth track segment A1322 will switch from point M or N' to point M'', and the position of the first slider A141 in the second track segment A1312 will switch from point N to point M or N' (from Figure 38 to Figure 26). During this process, the first positioning component A110 gradually begins to rotate relative to the second positioning component A120. At the same time, the first positioning component A110 moves from the lateral direction (specifically the right side direction) relative to the second positioning component A120 towards the position of the first sliding member A141 (which can be regarded as the positioning axis) to reset. It should be noted that when the first slider A141 is located at the rotation axis of the second positioning component A120 and the second slider A142 is located to the right of the first slider A141, the first positioning component A110 is reversible in the switching process relative to the second positioning component A120 towards the first direction F1 and the second direction F2, and is also reversible in the switching process towards the second direction F2 and the third direction F3, as well as in the switching process towards the third direction F3 and the fourth direction F4, and is also reversible in the switching process towards the fourth direction F4 and the first direction F1. Based on the principle and process of the first positioning component A110 rotating and sliding relative to the second positioning component A120 as described above, it can be known that when the first positioning component A110 rotates relative to the second positioning component A120 from the first direction F1 or the third direction F3 to the direction of the second direction F2 or the fourth direction F4, the first positioning component A110 can rotate relative to the second positioning component A120 to change its orientation, and at the same time, it can also be pulled outward along the fourth direction F4 or retracted inward along the second direction F2 relative to the second positioning component A120. In some embodiments, the second track segment A1312 can be selectively omitted, that is, the first track A131 only includes the first track segment A1311. In this case, when the first positioning component A110 rotates relative to the second positioning component A120 from the first direction F1 or the third direction F3 to the direction F2, the first positioning component A110 can retract inward relative to the second positioning component A120 towards the second direction F2 to move away from the door. When a child sits on the vehicle body A200 which is set to the side (specifically facing the left door), this can prevent the child from hitting the door when turning to the side use state, and also provide a large space for placing feet in the side use state. Similarly, in some other embodiments, the first track segment A1311 can be selectively omitted, that is, the first track A131 only includes the second track segment A1312. In this case, when the first positioning component A110 rotates relative to the second positioning component A120 from the first direction F1 or the third direction F3 to the fourth direction F4, the first positioning component A110 can rotate relative to the second positioning component A120 to change its orientation, and at the same time, it can also be pulled outward relative to the second positioning component A120 along the fourth direction F4 to get closer to the door. In this way, the vehicle body A200 connected to the first positioning component A110 can be closer to the door, thereby making it easier for the user to take the child out of the vehicle body A200 or put the child into the vehicle body A200. In addition, since it is not necessary to turn first and then perform the operation of pulling outward or pushing inward laterally as in the traditional way, the convenience of operation is improved. Of course, in some other embodiments not shown, the first track segment A1311 and the second track segment A1312 may be retained, and the positioning component A100 also includes a blocking mechanism (see below). This blocking mechanism may be provided on the movement path of the first slider A141 along the first track segment A1311 to restrict the first positioning component A110 from rotating relative to the second positioning component A120 from the first direction F1 or the third direction F3 to the direction F2. In this way, the vehicle body A200 can only rotate with the first positioning component A110 to the direction F4 to be pulled outward to the right, thereby improving the convenience of picking up and placing children laterally (specifically to the right).Alternatively, the blocking mechanism can be set on the movement path of the first slider A141 along the second track segment A1312 to restrict the first positioning component A110 from rotating relative to the second positioning component A120 from the first direction F1 or the third direction F3 to the fourth direction F4. In this way, the vehicle body A200 can only rotate with the first positioning component A110 to the second direction F2 to retract inward to the left, so as to avoid hitting the left door when using the vehicle body A200 laterally (specifically to the left), while increasing the foot placement space when using it laterally. As described above, in the fifth to eighth embodiments, when the first slider A141 is positioned at the positioning axis of the second positioning component A120, the second slider A142 can be positioned in front of, behind, to the left of, and to the right of the first slider A141. In each embodiment, the first positioning component A110 can slide while rotating relative to the second positioning component A120. This improves the convenience of user operation. It should be noted that the "first sliding member A141" and "second sliding member A142" in the embodiments of the first aspect can be collectively referred to as sliding components. Furthermore, it should be noted that in the embodiments of this aspect, when the first positioning component A110 protrudes relative to the second positioning component A120 towards one side (such as the left or right side), it means that the geometric center of the first positioning component A110 relative to the second positioning component A120 is displaced to one side. The vehicle body A200 can also be considered to have undergone lateral displacement relative to the second positioning component A120, so that the front end of the vehicle body A200 (the position where the child's feet are placed) is closer to that side door. When the first positioning component A110 retracts relative to the second positioning component A120 toward one side (such as the left or right side) of the second positioning component A120, the geometric center of the first positioning component A110 relative to the second positioning component A120 is displaced to the opposite side. The vehicle body A200 will also retract laterally relative to the second positioning component A120 so that the front end of the vehicle body A200 (the position where the child's feet are placed) moves away from the door on that side. A second aspect of the present invention provides a carrier A1000, which includes a carrier body A200 and a positioning component A100 provided in some embodiments of the present invention. The carrier body A200 can be fixedly mounted on the positioning component A100; alternatively, the carrier body A200 can be detachably mounted on the positioning component A100. In the carrier A1000 provided in this embodiment, the carrier body A200 is the same as the carrier body A200 in the carrier A1000 provided in the preceding embodiments. The positioning component A100 is similar to the positioning component A100 in the preceding embodiments, including components such as a first positioning component A110 and a second positioning component A120. Specifically, the positioning component A100 in this embodiment can be considered a variation of the positioning component A100 described above. Therefore, unless otherwise specified, the structure of the first positioning component A110, the second positioning component A120, and the connection relationships between the components in this embodiment can be referred to the description in the above embodiments. The following mainly describes the differences between this embodiment and the above embodiments. Specifically, in some embodiments, the positioning component A100 also includes a first positioning component A110 and a second positioning component A120. The first positioning component A110 is used to connect to the vehicle body A200; the second positioning component A120 is used to connect to the vehicle seat. One of the first positioning component A110 and the second positioning component A120 is provided with a first track A131 and a second track A132, and the other is provided with a sliding component A143. For example, the first positioning component A110 is provided with a first track A131 and a second track A132, and the second positioning component A120 is provided with a sliding component A143. Specifically, the first track A131 and the second track A132 intersect, and the sliding component A143 is capable of rotating within the first track A131 and sliding within the second track A132. The first positioning component A110 rotates within the first track A131 relative to the second positioning component A120 via the sliding component A143, and slides within the second track A132 relative to the second positioning component A120 via the sliding component A143. More specifically, in this embodiment, the first positioning component A110 is provided with the sliding component A143, and the second positioning component A120 is provided with the first track A131 and the second track A132. The first track A131 and the second track A132 are connected at their intersection, and the sliding component A143 can slide continuously between the first track A131 and the second track A132. It should be noted that "continuous sliding" means that the sliding component A143 moves continuously along the direction of the track between the first track A131 and the second track A132. This movement can be a back-and-forth movement between the two tracks, or a continuous unidirectional or reciprocating movement between the two tracks along a certain direction. Referring to Figures 39 and 40, in the positioning component A100 provided in the first embodiment of the second aspect, the first positioning component A110 is provided with a sliding component A143, and the second positioning component A120 is provided with a first track A131 and a second track A132. The first track A131 includes a first channel A1313, which has a circular structure, and the center of the first channel A1313 may coincide with or be offset from the geometric center of the second positioning component A120. Specifically, the center of the first channel A1313 coincides with the geometric center of the second positioning component A120, and when the first positioning component A110 is mounted on the second positioning component A120, and the sliding component A143 is located within the first channel A1313, the center of the first channel A1313 is coaxially arranged with the center of the first positioning component A110. The second track A132 extends along a second direction F2 or a fourth direction F4 (i.e., away from the second direction F2). Specifically, the second track A132 includes a second channel A1323, which has a strip-shaped structure, and the first channel A1313 and the second channel A1323 are connected at their intersection. Specifically, the sliding component A143 includes a slider A1432, which is connected to the first positioning component A110 and is capable of rotating within the first channel A1313 and sliding within the second channel A1323. More specifically, in this embodiment, the first channel A1313 and the second channel A1323 can be considered as groove structures provided on the upper surface of the second top cover A121. Referring again to Figures 39 and 40, in one embodiment, the length L1 and width W1 of slider A1432 are both less than or equal to the diameter D of the first channel A1313, allowing slider A1432 to rotate within the first channel A1313. The length L1 of slider A1432 is greater than the width W2 of the second channel A1323, and the width W1 of slider A1432 is less than or equal to the width W2 of the second channel A1323, allowing slider A1432 to slide within the second channel A1323 while restricting rotation within the second channel A1323. Thus, the orientation of the first positioning component A110 relative to the second positioning component A120 can be changed by the rotation of slider A1432 within the first channel A1313. When the first positioning component A110 is oriented toward the extension direction of the second channel A1323, the slider A1432 can be driven to move from the first channel A1313 into the second channel A1323, thereby changing the setting position of the first positioning component A110 relative to the second positioning component A120. Specifically, in this embodiment, the second channel A1323 is divided into a third track segment A1321 and a fourth track segment A1322 by the first channel A1313, and the third track segment A1321 and the fourth track segment A1322 are respectively connected to the first channel A1313. The third track segment A1321 extends from the first channel A1313 towards the second direction F2, and the fourth track segment A1322 extends from the first channel A1313 towards the fourth direction F4. When the first positioning component A110 rotates relative to the second positioning component A120 to face the second direction F2 or the fourth direction F4, the length direction of the slider A1432 is parallel to the second direction F2. Referring to Figures 39 and 40, when slider A1432 is located within the first channel A1313, slider A1432 can rotate within the first channel A1313. This allows the first positioning component A110 to rotate freely relative to the second positioning component A120. For example, the first positioning component A110 can rotate relative to the second positioning component A120 to any one of the first direction F1, the second direction F2, the third direction F3, and the fourth direction F4. In this embodiment, since the third track segment A1321 extends from the first channel A1313 toward the second direction F2 and the fourth track segment A1322 extends from the first channel A1313 toward the fourth direction F4, when the first positioning component A110 rotates relative to the second positioning component A120 toward the second direction F2 or the fourth direction F4, the slider A1432 can be driven to move from the first channel A1313 toward the third track segment A1321 or the fourth track segment A1322 by pushing or pulling the first positioning component A110. Specifically, for example, when the first positioning component A110 rotates relative to the second positioning component A120 to face the second direction F2, the first positioning component A110 can be moved inward away from the second direction F2 by directly pushing the vehicle body A200, so that the slider A1432 enters the fourth track segment A1322. This increases the distance between the front end of the vehicle body A200 and the left door when the vehicle body A200 is connected to the first positioning component A110 (compare Figures 41 and 42). When the vehicle body A200 rotates with the first positioning component A110 relative to the second positioning component A120 to face the second direction F2, it prevents the front end of the vehicle body A200 from hitting the left door. Furthermore, when a child sits in the side-mounted vehicle body A200, there is ample space for their feet. Alternatively, when the first positioning component A110 rotates relative to the second positioning component A120 to face the second direction F2, the vehicle body A200 can be moved along the second direction F2 and protrude to the left by directly pulling it. In this way, when the vehicle body A200 is connected to the first positioning component A110, the distance between the front end of the vehicle body A200 and the left door can be reduced, making it easier for the user to take the child out of the vehicle body A200 or put the child into the vehicle body A200. Referring to Figures 39, 43, and 44, a second embodiment of the second aspect of the present invention provides a positioning component A100, which can be considered a variation of the positioning component A100 in the first embodiment of the second aspect, the main difference being that the structures of the first track A131 and the second track A132 are slightly different. Similarly, unless otherwise specified, the following mainly describes the differences between this embodiment and the first embodiment of the second aspect described above. In this embodiment, as shown in FIG43, the first track A131 includes a first channel A1313 and a first groove A1314, and the second track A132 includes a second channel A1323 and a second groove A1324. The structures of the first channel A1313 and the second channel A1323 are similar to those in the ninth embodiment, except that both the first channel A1313 and the second channel A1323 are located on the lower surface of the second top cover A121, i.e., on the side of the second top cover A121 facing the second mounting cavity A123. The first groove A1314 is located on the second top cover A121 and inside the first channel A1313, and the second groove A1324 is located on the second top cover A121 and inside the second channel A1323. The second groove A1324 communicates with the first groove A1314 and extends along the extension direction of the second channel A1323, i.e., along the second direction F2 or the fourth direction F4. It should be noted that both the first slide groove A1314 and the second slide groove A1324 are through-slot structures. Specifically, the sliding assembly A143 includes a slider A1432 and a sliding rod A1431. The sliding assembly A143 is connected to the first positioning assembly A110 via the sliding rod A1431. The sliding rod A1431 passes through the first slide groove A1314 or the second slide groove A1324 to connect with the slider A1432, so that the sliding assembly A143 can rotate within the first track A131 and move within the second track A132 via the slider A1432. It should be noted that the width of the slider A1432 is greater than the width of the first slide groove A1314 and the diameter of the second slide groove A1324 (see Figures 43 and 44). In this way, the slider A1432 can be confined within the second mounting cavity A123, preventing the first positioning assembly A110 from disengaging from the second positioning assembly A120 when rotating or sliding relative to the second positioning assembly A120. Referring to Figures 39 and 45, a third embodiment of the second aspect of the present invention provides a positioning component A100, which can be considered a variation of the positioning component A100 in the ninth embodiment, the main difference being that the structures of the first track A131 and the second track A132 are slightly different. Similarly, unless otherwise specified, the following mainly describes the differences between this embodiment and the first embodiment of the second aspect described above. In this embodiment, as shown in FIG45, the first track A131 includes a first channel A1313, and the second track A132 includes a second channel A1323, wherein the second channel A1323 has a strip-shaped structure. Both the first channel A1313 and the second channel A1323 are disposed on the upper surface of the second top cover A121. The difference is that the first channel A1313 has a ring-shaped structure, and the second channel A1323 passes through the first channel A1313 and is connected at the intersection. The sliding component A143 includes two sliders A14. 32. Both sliders A1432 are connected to and positioned opposite to the first positioning component A110. The two sliders A1432 can slide synchronously in the first channel A1313, that is, the two sliders A1432 can rotate synchronously along the first channel A1313 so that the first positioning component A110 rotates relative to the second positioning component A120. The two sliders A1432 can also slide synchronously in the second channel A1323 so that the first positioning component A110 slides relative to the second positioning component A120. Specifically, in this embodiment, the distance H1 between the sidewalls of the two sliders A1432 toward the center of the first channel A1313 is greater than or equal to the inner diameter D1 of the first channel A1313, so as to allow the two sliders A1432 to move synchronously within the first channel A1313, thereby allowing the first positioning component A110 to rotate relative to the second positioning component A120. More specifically, the distance H1 (i.e., the inner spacing) between the sidewalls of the two sliders A1432 toward the center of the first channel A1313 is greater than the width W2 of the second channel A1323, so as to allow the sliders A1432 to slide within the second channel A1323 while restricting their rotation within the second channel A1323. Referring again to Figure 45, specifically, in this embodiment, the second channel A1323 is divided by the first channel A1313 to form a third track segment A1321, a fifth track segment A1325, and a fourth track segment A1322 arranged sequentially. The first channel A1313 is divided by the second channel A1323 to form a first arc segment A1315 and a second arc segment A1316. The first end of the first arc segment A1315 and the first end of the second arc segment A1316 are both connected to the first end of the fifth track segment A1325 and the third track segment A1321, and the second end of the first arc segment A1315 and the second end of the second arc segment A1316 are both connected to the second end of the fifth track segment A1325 and the fourth track segment A1322. In this way, the two sliders A1432 can rotate simultaneously within the first channel A1313 to change the orientation of the first positioning component A110 relative to the second positioning component A120, and can also move simultaneously from the first channel A1313 into the second channel A1323 to change the position of the first positioning component A110 relative to the second positioning component A120. Referring to Figures 39 and 46, a fourth embodiment of the second aspect of the present invention provides a positioning component A100, which can be considered a variation of the positioning component A100 in the third embodiment of the second aspect, the main difference being that the structures of the first track A131 and the second track A132 are slightly different. Similarly, unless otherwise specified, the following mainly describes the differences between this embodiment and the third embodiment of the second aspect described above. In this embodiment, as shown in FIG46, the first track A131 includes a first channel A1313 and a first groove A1314, and the second track A132 includes a second channel A1323 and a second groove A1324. The structures of the first channel A1313 and the second channel A1323 are similar to those in the eleventh embodiment, except that both the first channel A1313 and the second channel A1323 are located on the lower surface of the second top cover A121. Specifically, the first groove A1314 is located on the second top cover A121 and inside the first channel A1313, thus the first groove A1314 can be considered an annular structure. The second groove A1324 is located on the second top cover A121 and inside the second channel A1323. The second groove A1324 communicates with the first groove A1314 and extends along the extension direction of the second channel A1323, i.e., along the second direction F2 or the fourth direction F4. It should be noted that both the first slide groove A1314 and the second slide groove A1324 are through-slot structures. More specifically, the sliding assembly A143 also includes two sliding rods A1431 (see Figure 39). Both sliding rods A1431 are connected to the first positioning assembly A110 and pass through the first slide groove A1314 or the second slide groove A1324 before connecting to two sliders A1432 respectively. It should be noted that the width of the sliders A1432 is greater than the width of the first slide groove A1314 and the second slide groove A1324 (see Figure 46). In this way, the sliders A1432 can be confined within the second mounting cavity A123, preventing the first positioning assembly A110 from disengaging from the second positioning assembly A120 when it rotates or slides relative to the second positioning assembly A120. Referring to Figures 39 and 47, a fifth embodiment of the second aspect of the present invention provides a positioning component A100, which can be considered a variation of the positioning component A100 in the fourth embodiment of the second aspect, the main difference being that the structures of the first track A131 and the second track A132 are slightly different. Similarly, unless otherwise specified, the following mainly describes the differences between this embodiment and the fourth embodiment of the second aspect described above. In this embodiment, as shown in FIG47, the first track A131 includes only the first groove A1314, which has a ring structure, and the second track A132 includes only the second groove A1324, which has a strip structure. The first groove A1314 and the second groove A1324 are connected at their intersection. Specifically, the second groove A1324 is divided by the first groove A1314 to form a third track segment A1321, a fifth track segment A1325, and a fourth track segment A1322 arranged in sequence. The first groove A1314 is divided by the second groove A1324 to form a first arc segment A1315 and a second arc segment A1316. The first end of the first arc segment A1315 and the first end of the second arc segment A1316 are both connected to the first end of the fifth track segment A1325 and the third track segment A1321. The second end of the first arc segment A1315 and the second end of the second arc segment A1316 are both connected to the second end of the fifth track segment A1325 and the fourth track segment A1322. More specifically, as shown in Figures 39 and 47, the sliding assembly A143 includes two sliders A1432 and two sliding rods A1431. The two sliding rods A1431 are both connected to the first positioning assembly A110 and are arranged opposite to each other. The two sliding rods A1431 pass through the first slide groove A1314 or the second slide groove A1324 and are respectively connected to the two sliders A1432. The two sliding rods A1431 can slide simultaneously in the first slide groove A1314 so that the first positioning component A110 rotates relative to the second positioning component A120, and the two sliders A1432 can slide synchronously in the second slide groove A1324 so that the first positioning component A110 slides relative to the second positioning component A120 along the second direction F2 or the fourth direction F4. As described above, in the first to fifth embodiments of the second aspect, the first positioning component A110 shown in each embodiment is capable of rotating and sliding relative to the second positioning component A120. It should be noted that in each embodiment of this aspect, when the first positioning component A110 protrudes to one side (such as the left or right side) of the second positioning component A120 relative to it, the first positioning component A110 is displaced to one side relative to the geometric center of the second positioning component A120. The vehicle body A200 can also be considered to have undergone lateral displacement relative to the second positioning component A120, so that the front end of the vehicle body A200 (the position where the child's feet are placed) is closer to that side door. When the first positioning component A110 retracts relative to the second positioning component A120 toward one side (such as the left or right side) of the second positioning component A120, the geometric center of the first positioning component A110 relative to the second positioning component A120 is displaced to the opposite side. The vehicle body A200 will also retract laterally relative to the second positioning component A120 so that the front end of the vehicle body A200 (the position where the child's feet are placed) moves away from the door on that side. An embodiment of a third aspect of the present invention provides a carrier A1000, which includes a carrier body A200 and a positioning component A100 provided in some embodiments of the present invention. The carrier body A200 can be fixedly mounted on the positioning component A100; alternatively, the carrier body A200 can be detachably mounted on the positioning component A100. In the carrier A1000 provided in this embodiment, the carrier body A200 is the same as the carrier body A200 provided in the preceding embodiments. The positioning component A100 is similar to the positioning component A100 in the preceding embodiments, including components such as a first positioning component A110 and a second positioning component A120. The first positioning component A110 is rotatable relative to the second positioning component A120, allowing the first positioning component A110 to rotate in various directions relative to the second positioning component A120, for example, a first direction F1, a second direction F2, a third direction F3, or a fourth direction F4. Specifically, the principle of rotation of the first positioning component A110 relative to the second positioning component A120 can be referred to any of the above embodiments. It should be noted that, in this embodiment, the first positioning component A110 can rotate and slide relative to the second positioning component A120; or, in this embodiment, the first positioning component A110 can only rotate relative to the second positioning component A120, and is limited to sliding relative to the second positioning component A120. Referring to Figures 1 and 48, in this embodiment, the first top cover A111 of the first positioning component A110 is provided with a slot A114. When the carrier body A200 is connected to the first positioning component A110, the slot A114 is used to accommodate the engaging member A210 on the positioning component A100. More specifically, the slot A114 has a through hole inside, which connects to the first mounting cavity (the cavity inside the first positioning component A110, i.e., the chamber formed by the first top cover A111 and the first bottom cover A112 being connected vertically). The engaging hook A151 is rotatably disposed in the first mounting cavity and can extend into the slot A114 through the through hole. When the engaging hook A151 is in the locked position, the engaging hook A151 extends at least partially into the slot A114 to block the opening of the slot A114, thus confining the engaging member A210 within the slot A114. When the locking hook A151 is in the unlocked position, the locking hook A151 retracts from the locking groove A114, so that the opening of the groove A114 is opened, and the locking piece A210 can be disengaged from the groove A114. In one embodiment, the first connecting mechanism A150 may include two sets of engaging hooks A151, and the carrier body A200 is provided with two engaging members A210 (see Figures 1 and 48). The two engaging members A210 are spaced apart along the Q1 or Q3 direction of the carrier body A200. Correspondingly, the two sets of engaging hooks A151 are spaced apart along the Q1 (or Q3) direction on the first positioning component A110. Thus, the two sets of engaging hooks A151 can be used to lock or unlock the corresponding engaging member A210. When the first positioning component A110 rotates relative to the second positioning component A120 to face the first direction F1 or the third direction F3, both the Q1 and Q3 directions are parallel to the first direction F1 or the third direction F3. When the first positioning component A110 rotates relative to the second positioning component A120 to face the second direction F2 or the fourth direction F4, both the Q1 and Q3 directions are parallel to the second direction F2 or the fourth direction F4. Specifically, when both locking components A210 are simultaneously locked by two sets of locking hooks A151, the stability and reliability of the vehicle body A200 mounted on the first positioning component A110 can be improved, preventing the vehicle body A200 from moving or rotating arbitrarily relative to the first positioning component A110. Of course, in other embodiments, the first connecting mechanism A150 may also include a set of locking hooks A151, and the vehicle body A200 may have one locking component A210. It should be noted that in this embodiment, a set of locking hooks A151 may include one, two, or more locking hooks A151. When a set of locking hooks A151 includes multiple locking hooks A151, the multiple locking hooks A151 are spaced apart along the Q2 direction (or Q4 direction). It should be noted that when the first positioning component A110 is oriented relative to the second positioning component A120 in the first direction F1 or the third direction F3, directions Q2 and Q4 are both parallel to the second direction F2 or the fourth direction F4 (see Figures 1 and 2); when the first positioning component A110 is oriented relative to the second positioning component A120 in the second direction F2 or the fourth direction F4, directions Q2 and Q4 are both parallel to the first direction F1 or the third direction F3 (see Figure 49). It should be noted that direction Q1 refers to the forward direction along the front-rear direction of the first positioning component A110 or the vehicle body A200; direction Q2 refers to the rearward direction along the front-rear direction of the first positioning component A110 or the vehicle body A200; direction Q3 refers to the leftward direction along the left-right direction of the first positioning component A110 or the vehicle body A200; and direction Q4 refers to the rightward direction along the left-right direction of the first positioning component A110 or the vehicle body A200. Specifically, the Q1 direction is parallel to and opposite to the Q3 direction, the Q2 direction is parallel to and opposite to the Q4 direction, and the Q1 direction and Q2 direction intersect. In particular, the Q1 direction is perpendicular to the Q2 direction. In other embodiments of the third aspect, the vehicle body A200 may be provided with at least two engaging members A210, which are spaced apart along the Q1 or Q3 direction of the vehicle body A200. The first connecting mechanism A150 may include at least three sets of engaging hooks A151, which are spaced apart along the Q1 or Q3 direction on the first positioning component A110 (see Figure 49). When all sets of engaging hooks A151 are in the locked position, each set of engaging hooks A151 is used to engage and lock with each engaging member A210 on the vehicle body A200. Specifically, at least two engaging members A210 can be selectively locked to any two adjacent sets of engaging hooks A151, so that the vehicle body A200 has a first use state and a second use state relative to the positioning component A100. Referring to Figures 48 and 49, specifically, in this embodiment, the principle that the two locking pieces A210 can be selectively locked to any two adjacent sets of locking hooks A151 can be simply explained by taking the example that the vehicle body A200 is provided with two locking pieces A210 and the first connecting mechanism A150 includes three sets of locking hooks A151, so that the vehicle body A200 has a first use state and a second use state relative to the positioning component A100. To facilitate understanding of the engagement relationship between the two engaging parts A210 and the three sets of engaging hooks A151, the engaging part A210 closer to the front end of the vehicle body A200 is defined as the first engaging part A2101, and the engaging part A210 closer to the rear end of the vehicle body A200 is defined as the second engaging part A2102. Taking the first positioning component A110 rotated relative to the second positioning component A120 to face the first direction F1 as a reference, the three sets of engaging hooks A151 on the first positioning component A110 are sequentially referred to as the first set of engaging hooks A1511, the second set of engaging hooks A1512, and the third set of engaging hooks A1513 along the Q3 direction of the first positioning component A110 (see Figure 49). In other words, when the first positioning component A110 faces the first direction F1, the first set of engaging hooks A1511 is located at the foremost position along the first direction F1 (or Q1 direction), that is, closer to the support leg A162, and the third set of engaging hooks A1513 is located at the rearmost position along the first direction F1 (or Q1 direction). When the first positioning component A110 rotates relative to the second positioning component A120 to face the second direction F2, the first set of engaging hooks A1511 can be considered as being closest to the left door, and the third set of engaging hooks A1513 can be considered as being closest to the right door. Referring to Figures 48 to 50, in one embodiment, when the vehicle body A200 is connected to the first positioning component A110 via the first connecting mechanism A150, the vehicle body A200 and the first positioning component A110 can engage in the same direction, meaning that the orientation of the vehicle body A200 relative to the positioning component A100 is the same as the orientation of the first positioning component A110 relative to the second positioning component A120. For example, the first positioning component A110 and the vehicle body A200 are oriented in the same direction as a first direction F1, a second direction F2, a third direction F3, or a fourth direction F4. Therefore, when the vehicle body A200 and the first positioning component A110 engage in the same direction, the first set of engaging hooks A1511 can be considered as being closer to the front end of the vehicle body A200, and the third set of engaging hooks A1513 can be considered as being closer to the rear end of the vehicle body A200. Specifically, when the vehicle body A200 is in the first use state relative to the positioning component A100, the two locking pieces A210 (i.e., the first locking piece A2101 and the second locking piece A2102) are respectively locked to the first two sets of locking hooks A151 (i.e., the first set of locking hooks A1511 and the second set of locking hooks A1512) located near the front end of the first positioning component A110. For example, when the first positioning component A110 rotates relative to the second positioning component A120 to face the second direction F2 (see Figure 49), and the vehicle body A200 faces the second direction F2 (see Figure 50), the first locking piece A2101 is locked to the first set of locking hooks A1511, and the second locking piece A2102 is locked to the second set of locking hooks A1512. At this time, the front end of the vehicle body A200 protrudes outward relative to the first positioning component A110 along the orientation of the vehicle body A200 (i.e., the second direction F2) (not shown in the figure). For example, when the first positioning component A110 rotates relative to the second positioning component A120 to face the fourth direction F4 (not shown), and the vehicle body A200 faces the fourth direction F4, the first engaging component A2101 is locked to the first set of engaging hooks A1511, and the second engaging component A2102 is locked to the second set of engaging hooks A1512. At this time, the front end of the vehicle body A200 protrudes outward relative to the first positioning component A110 along the orientation of the vehicle body A200 (i.e., the fourth direction F4) (not shown in the figure). In this way, when the vehicle body A200 rotates with the first positioning component A110 relative to the second positioning component A120 to the second direction F2 or the fourth direction F4, the distance between the front end of the vehicle body A200 and the left or right door can be reduced, thereby making it easier for the user to take the child out of the vehicle body A200 or put the child into the vehicle body A200. When the vehicle body A200 is in the second use state relative to the positioning component A100, the two locking parts A210 (i.e., the first locking part A2101 and the second locking part A2102) are respectively locked to the last two sets of locking hooks A151 (i.e., the second set of locking hooks A1512 and the third set of locking hooks A1513) located near the rear end of the first positioning component A110. For example, when the first positioning component A110 rotates relative to the second positioning component A120 to face the second direction F2 (see Figure 49), and the front end of the vehicle body A200 faces the second direction F2 (see Figure 50), the first locking component A2101 is locked to the second set of locking hooks A1512, and the second locking component A2102 is locked to the third set of locking hooks A1513 (see Figures 49 and 51). At this time, the front end of the vehicle body A200 is retracted inward relative to the first positioning component A110 along the orientation of the front end of the vehicle body A200 (i.e., the second direction F2) (see Figures 50 and 51). For example, when the first positioning component A110 rotates relative to the second positioning component A120 to face the fourth direction F4 (not shown), and the vehicle body A200 faces the fourth direction F4, the first engaging component A2101 is locked to the second set of engaging hooks A1512, and the second engaging component A2102 is locked to the third set of engaging hooks A1513. At this time, the front end of the vehicle body A200 retracts inward relative to the first positioning component A110 along the orientation of the vehicle body A200 (i.e., the fourth direction F4). For example, when the first positioning component A110 rotates relative to the second positioning component A120 to face a third direction F3, and the vehicle body A200 faces a third direction F3, the first engaging component A2101 is locked to the second set of engaging hooks A1512, and the second engaging component A2102 is locked to the third set of engaging hooks A1513. At this time, the front end of the vehicle body A200 retracts inward relative to the first positioning component A110 along the orientation of the vehicle body A200 (i.e., the third direction F3) (see Figures 52 and 53). In this way, when the vehicle body A200 rotates with the first positioning component A110 relative to the second positioning component A120 to the second direction F2 (see Figures 50 and 51) or the fourth direction F4, the distance between the front end of the vehicle body A200 and the left or right door can be increased, preventing collision with the left or right door; in addition, it provides more space for children to place their feet when sitting sideways. Similarly, when the vehicle body A200 rotates to a third direction F3 relative to the second positioning component A120 with the first positioning component A110 (see Figure 52), the distance between the front end of the vehicle body A200 and the back of the car seat can be increased, so that the child has more space to place his feet when sitting in the rear. Optionally, in other embodiments, when the vehicle body A200 is connected to the first positioning component A110 via the first connecting mechanism A150, the vehicle body A200 and the first positioning component A110 can also engage in reverse, that is, the orientation of the vehicle body A200 relative to the positioning component A100 is opposite to the orientation of the first positioning component A110 relative to the second positioning component A120. For example, when the first positioning component A110 is oriented in the first direction F1, the vehicle body A200 is oriented in the third direction F3; or, when the first positioning component A110 is oriented in the second direction F2, the vehicle body A200 is oriented in the fourth direction F4. It should be noted that in this embodiment, when the vehicle body A200 is connected to the first positioning component A110, the vehicle body A200 also has a first usage state and a second usage state. The difference from the above embodiment is that when the vehicle body A200 and the first positioning component A110 are engaged in reverse, the first set of engaging hooks A1511 is closer to the rear end of the vehicle body A200, and the third set of engaging hooks A1513 is closer to the front end of the vehicle body A200. When the vehicle body A200 is in the first use state relative to the first positioning component A110, the two engaging pieces A210 are respectively locked to the first two sets of engaging hooks A151 (i.e., the second set of engaging hooks A1512 and the third set of engaging hooks A1513) located near the rear end of the first positioning component A110; when the vehicle body A200 is in the second use state relative to the positioning component A100, the two engaging pieces A210 are respectively locked to the latter two sets of engaging hooks A151 (i.e., the first set of engaging hooks A1511 and the second set of engaging hooks A1512) located near the front end of the first positioning component A110. Other aspects are similar to the above embodiment and will not be described again. Optionally, in another embodiment, the principle that two of the locking members A210 can be selectively locked to any two adjacent sets of locking hooks A151 can be simply explained by taking the vehicle body A200 having three locking members A210 and the first connecting mechanism A150 including three sets of locking hooks A151 as an example, so that the vehicle body A200 has a first use state and a second use state relative to the positioning component A100. To facilitate understanding of the engagement relationship between the three engaging components A210 and the three sets of engaging hooks A151, refer to Figures 53 and 54. Among the three engaging components A210, the engaging component A210 closest to the front end of the vehicle body A200 is the first engaging component A2101, the engaging component A210 closest to the rear end of the vehicle body A200 is the second engaging component A2102, and the engaging component A210 located between the two engaging components A210 is the third engaging component A2103. Similarly, taking the case where the first positioning component A110 rotates relative to the second positioning component A120 to face the first direction F1 as a reference, the three sets of engaging hooks A151 on the first positioning component A110 are sequentially referred to as the first set of engaging hooks A1511, the second set of engaging hooks A1512, and the third set of engaging hooks A1513 along the Q3 direction; in other words, when the first positioning component A110 faces the first direction F1, the first set of engaging hooks A1511 is located at the foremost end along the first direction F1 (or Q1 direction), that is, closer to the support leg A162, and the third set of engaging hooks A1513 is located at the rearmost end along the first direction F1 (or Q1 direction). In this embodiment, the vehicle body A200 engages with the first positioning component A110 in the same direction. It should be noted that when the vehicle body A200 and the first positioning component A110 engage in the same direction, the first set of engaging hooks A1511 can be regarded as being closer to the front end of the vehicle body A200, and the third set of engaging hooks A1513 can be regarded as being closer to the rear end of the vehicle body A200. When the vehicle body A200 is in the first use state relative to the positioning component A100, the two adjacent first locking parts A210 (i.e., the first locking part A2101 and the third locking part A2103) or the two adjacent last locking parts A210 (i.e., the second locking part A2102 and the third locking part A2103) are respectively locked to the two sets of locking hooks A151 (i.e., the first set of locking hooks A1511 and the second set of locking hooks A1512) provided near the front end of the first positioning component A110. For example, when the first positioning component A110 is oriented towards a third direction F3 relative to the second positioning component A120, and the front end of the vehicle body A200 is oriented towards a third direction F3, the first locking component A2101 is locked to the first set of locking hooks A1511, and the third locking component A2103 is locked to the second set of locking hooks A151. The second locking component A2102 can be locked to the third set of locking hooks A1513 or is in a free state (i.e., not locked by any set of locking hooks A151). At this time, the front end of the vehicle body A200 protrudes outward relative to the first positioning component A110 along the orientation of the vehicle body A200 (i.e., the third direction F3) (see Figure 54). For example, when the first positioning component A110 is oriented relative to the second positioning component A120 towards a third direction F3, and the front end of the vehicle body A200 is also oriented towards a third direction F3, the third locking component A2103 is locked to the first set of locking hooks A1511, and the second locking component A2102 is locked to the second set of locking hooks A1512. At this time, the front end of the vehicle body A200 also protrudes outward relative to the first positioning component A110 along the orientation of the vehicle body A200 (i.e., the third direction F3). For example, when the first positioning component A110 is oriented towards the second direction F2 or the fourth direction F4 relative to the second positioning component A120, and the vehicle body A200 is installed in the same direction as the first positioning component A110, the two adjacent locking parts A210 (i.e., the first locking part A2101 and the third locking part A2103, or the third locking part A2103 and the second locking part A2102) are respectively locked to the first two sets of locking hooks A151 (i.e., the first set of locking hooks A1511 and the second set of locking hooks A1512) provided near the front end of the first positioning component A110, and the front end of the vehicle body A200 protrudes outward relative to the first positioning component A110 along the orientation of the vehicle body A200 (i.e., the second direction F2 or the fourth direction F4) (not shown in the figure). When the vehicle body A200 is in the second usage state relative to the positioning component A100, the two adjacent first engaging parts A210 (i.e., the first engaging part A2101 and the third engaging part A2103) are respectively locked to the two sets of engaging hooks A151 (i.e., the second set of engaging hooks A1512 and the third set of engaging hooks A1513) located near the rear end of the first positioning component A110. For example, when the first positioning component A110 is facing a third direction F3 relative to the second positioning component A120, and the vehicle body A200 is facing a third direction F3, the first engaging part A2101 is locked to the second set of engaging hooks A151, and the third engaging part A2103 is locked to the third set of engaging hooks A1513. The second engaging part A2102 is in a free state, that is, it is not locked by any set of engaging hooks A151, and the first set of engaging hooks A1511 is not engaged with any engaging part A210. At this time, the front end of the vehicle body A200 retracts inward relative to the first positioning component A110 along the orientation of the vehicle body A200 (i.e., the third direction F3) (see Figure 53). For example, when the first positioning component A110 is oriented relative to the second positioning component A120 in the second direction F2 or the fourth direction F4, and the front end of the vehicle body A200 is oriented in the second direction F2 or the fourth direction F4, the first engaging member A2101 is locked to the second set of engaging hooks A1512, and the third engaging member A2103 is locked to the third set of engaging hooks A1513. The second engaging member A2102 is in a free state, i.e., not locked by any set of engaging hooks A151. At this time, the front end of the vehicle body A200 retracts inward relative to the first positioning component A110 along the orientation of the vehicle body A200 (i.e., the second direction F2 or the fourth direction F4) (see Figures 50 and 51). In this way, the user can adjust the distance between the front end of the vehicle body A200 and the interior wall of the car (such as the door, the back of the seat, etc.) by changing the corresponding engagement relationship between each engagement piece A210 in the vehicle body A200 and each set of engagement hooks A151 on the first positioning component A110. It should be noted that the first connecting mechanism A150 described above can be applied to any of the preceding embodiments. Please refer to Figures 55 to 57, which schematically show perspective views of a carrier B1000 provided according to a fourth aspect of the present invention. The carrier B1000 includes a carrier body B300 and a positioning component B100 provided according to another embodiment of the present invention. The carrier body B300 and the positioning component B100 will be described concurrently with the following description of the carrier B1000. Figures 58 to 60 generally illustrate the structure of a positioning component B100 in one embodiment of the present invention. This positioning component B100 is used to mount a vehicle body B300 (see Figures 55 to 57) onto a car seat (not shown). In one embodiment, the positioning component B100 may include a first positioning component B110 and a second positioning component B120. Figures 61 and 62 show the structure of the second positioning component B120 in one embodiment of the present invention, while Figure 63 shows the structure of the first positioning component B110 in one embodiment of the present invention. One of the first positioning component B110 and the second positioning component B120 is provided with a first track B131 and a second track B132 that are intersected. The other of the first positioning component B110 and the second positioning component B120 is provided with a sliding component that slides along the first track B131 and the second track B132. Specifically, the sliding component includes a first sliding member B141 and a second sliding member B142. For example, as shown in Figures 61 to 63, the first positioning component B110 is provided with a first slider B141 and a second slider B142, and the second positioning component B120 is provided with a first track B131 and a second track B132. Alternatively, in other embodiments not shown, the first positioning component B110 is provided with a first track B131 and a second track B132, and the second positioning component B120 is provided with a first slider B141 and a second slider B142. The first slider B141 slides along either the first track B131 or the second track B132, and the second slider B142 slides along the other of the first track B131 or the second track B132. For example, as shown in Figures 62 and 63, the first slider B141 slides along the second track B132, and the second slider B142 slides along the first track B131. Alternatively, in other embodiments not shown, the first slider B141 slides along the first track B131, and the second slider B142 slides along the second track B132. In this way, by sliding the first slider B141 along either the first track B131 or the second track B132, and the second slider B142 along the other of the first track B131 or the second track B132, the first positioning component B110 can be displaced simultaneously with the rotation of the second positioning component B120. In one embodiment, as shown in Figures 55 and 58, the first positioning component B110 is used to connect the vehicle body B300, and the second positioning component B120 is used to connect the vehicle seat. Specifically, as shown in Figures 57 to 59, the first positioning component B110 is provided with a first connecting mechanism B170 (e.g., a latching hook), which is mainly used to connect with a latching member (not shown) at the bottom of the vehicle body B300. The second positioning component B120 is provided with a seat connecting mechanism B180 (e.g., an ISOFIX connector) and a support leg B190. The seat connecting mechanism B180 is mainly used to fix the second positioning component B120 to the vehicle seat, and the support leg B190 is mainly used to abut against the floor inside the vehicle. Thus, when the positioning component B100 is installed on the vehicle seat and the vehicle body B300 is installed on the positioning component B100, the orientation of the vehicle body B300 can be changed by rotating the first positioning component B110, allowing the vehicle body B300 to have different usage modes. In some embodiments, the orientation of the vehicle body B300 depends on the extension directions of the first track B131 and the second track B132. For example, when the first track B131 extends along a first direction F1 or a third direction F3, and the second track B132 extends along a second direction F2 or a fourth direction F4, the vehicle body B300 has a usage mode oriented towards the first direction F1 or the third direction F3, and a usage mode oriented towards the second direction F2 or the fourth direction F4. Referring to Figures 61 and 62, in one embodiment, the intersection point of the first track B131 and the second track B132 is defined as the intersection center B133. Both the first track B131 and the second track B132 are divided by the intersection center B133 to form two track segments. For example, the first track B131 is divided by the intersection center B133 to form a first track segment B1311 and a second track segment B1312, and the second track B132 is divided by the intersection center B133 to form a third track segment B1321 and a fourth track segment B1322. Specifically, the first track segment B1311 extends from the intersection center B133 in a first direction F1, the second track segment B1312 extends from the intersection center B133 in a third direction F3, the third track segment B1321 extends from the intersection center B133 in a second direction F2, and the fourth track segment B1322 extends from the intersection center B133 in a fourth direction F4. In this configuration, the third direction F3 is parallel to the first direction F1 but faces the opposite direction, and the fourth direction F4 is parallel to the second direction F2 but faces the opposite direction. Both the first direction F1 and the third direction F3 intersect the second direction F2 and the fourth direction F4. Specifically, both the first direction F1 and the third direction F3 are perpendicular to the second direction F2 and the fourth direction F4. When the positioning component B100 is fixed to the car seat, the first direction F1 is the front of the car during normal driving, i.e., the direction of the front of the car; the second direction F2 is the left side of the car during normal driving, i.e., the direction of the left door; the third direction F3 is the rear of the car during normal driving, i.e., the direction facing the rear of the car; and the fourth direction F4 can be considered the right side of the car during normal driving, i.e., the direction of the right door. In this way, the vehicle body B300 can rotate with the first positioning component B110 relative to the second positioning component B120 to face the front, rear, left, or right of the car, giving the vehicle body B300 a forward mode, a rearward mode, and a side mode. In this embodiment, the first positioning component B110 has a front end, a rear end, a left end, and a right end. To clearly understand the various ends of the first positioning component B110, taking the vehicle body B300 mounted on the first positioning component B110 as an example, the front-back direction of the vehicle body B300 is parallel to the front-back direction of the first positioning component B110, and the left-right direction of the vehicle body B300 is parallel to the left-right direction of the first positioning component B110. Specifically, when an infant or child is sitting inside the vehicle body B300, the front end of the first positioning component B110 is closer to the infant's or child's feet than the rear end; conversely, the rear end of the first positioning component B110 is closer to the infant's or child's head than the front end; the left end of the first positioning component B110 is closer to the infant's or child's left hand than the right end; and the right end of the first positioning component B110 is closer to the infant's or child's right hand than the left end. When the first positioning component A110 faces a certain direction, it means that the vehicle body A200 also faces the same direction; simultaneously, the child riding inside the vehicle body A200 also faces the same direction. To visually understand the front-back and left-right directions of the vehicle body B300 and the first positioning component B110, arrows Q1 and Q3 schematically indicate the "front" and "back" directions, respectively, and arrows Q2 and Q4 schematically indicate the "left" and "right" directions, respectively. Specifically, direction Q1 is parallel to and opposite to direction Q3, direction Q2 is parallel to and opposite to direction Q4, and direction Q1 and direction Q2 intersect. In particular, direction Q1 is perpendicular to direction Q2. These directional terms are used only to make the description of the embodiments of the present invention clearer and are not intended to unduly limit the scope of protection of the present invention. Therefore, the statement mentioned above that "the vehicle body B300 can rotate with the first positioning component B110 relative to the second positioning component B120 to face the front, rear, left or right of the vehicle" means that the front ends of the vehicle body B300 and the first positioning component B110 can face the front, rear, left or right of the vehicle. Referring to Figures 61 to 63, in one embodiment, the distance R1 between the intersection center B133 and the two ends of the first track B131 is greater than or equal to the distance R3 between the first slider B141 and the second slider B142, i.e., R1 ≥ R3; the distance R2 between the intersection center B133 and the two ends of the second track B132 is greater than or equal to the distance R3 between the first slider B141 and the second slider B142, i.e., R2 ≥ R3. Specifically, in this embodiment, R1 = R2 = R3; in other words, the lengths of the first track segment B1311, the second track segment B1312, the third track segment B1321, and the fourth track segment B1322 are all equal, and the length of each track segment is equal to the distance between the first slider B141 and the second slider B142. Of course, in some other embodiments not shown, some track segments may have equal lengths, while the remaining track segments may have unequal lengths. Alternatively, the lengths of all track segments may be unequal. Please refer to Figures 61 to 63. In this embodiment, taking the second positioning component B120 as having a first track B131 and a second track B132 arranged in a cross configuration, and the first positioning component B110 having a first sliding member B141 and a second sliding member B142 spaced apart, with the first sliding member B141 sliding along the second track B132 and the second sliding member B142 sliding along the first track B131 as an example, the structure and position of the first track B131, the second track B132, the first sliding member B141, and the second sliding member B142 are briefly explained. The principle of the first positioning component B110 rotating and moving relative to the second positioning component B120 is also briefly explained. In one embodiment, the first positioning component B110 is generally disk-shaped, the first slider B141 is located at the center of the first positioning component B110, and the second slider B142 is located off-center. Of course, in other embodiments, the first positioning component B110 can be other symmetrical shapes (e.g., ellipse, rectangle, etc.), and the first slider B141 can be located at or off-center from the geometric center of the first positioning component B110; alternatively, the first positioning component B110 can also be asymmetrical, and the position of the first slider B141 can be determined according to the shape of the first positioning component B110. Referring to Figures 55, 62, and 63, in some embodiments, when the vehicle body B300 on the first positioning component B110 faces the first direction F1, the second slider B142 is positioned on the first positioning component B110 behind the first slider B141 along the first direction F1. Specifically, during the process of the first positioning component B110 turning and moving relative to the second positioning component B120, when the first slider B141 is located at the intersection center B133 and the second slider B142 is located at the second track segment B1312, the first positioning component B110 faces the first direction F1 relative to the second positioning component B120. At this time, the vehicle body B300 mounted on the first positioning component B110 can be considered to be facing the front of the vehicle. When the first slider B141 is located at the intersection center B133 and the second slider B142 is located at the first track segment B1311, the first positioning component B110 faces a third direction F3 (i.e., away from the first direction F1) relative to the second positioning component B120. In this case, the vehicle body B300 mounted on the first positioning component B110 can be considered to face the rear of the vehicle. When the second slider B142 is located at the intersection center B133 and the first slider B141 is located at the third track segment B1321, the first positioning component B110 faces a second direction F2 relative to the second positioning component B120. In this case, the vehicle body B300 mounted on the first positioning component B110 can be considered to face the left side of the vehicle. When the second slider B142 is located at the intersection center B133 and the first slider B141 is located at the fourth track segment B1322, the first positioning component B110 faces the fourth direction F4 relative to the second positioning component B120. At this time, the vehicle body B300 mounted on the first positioning component B110 can be considered to face the right side of the vehicle (i.e., away from the second direction F2). It can be seen that by changing the position of the first slider B141 within the second track B132 and the position of the second slider B142 within the first track B131, the orientation of the vehicle body B300 on the first positioning component B110 can be changed, allowing the vehicle body B300 to have forward, backward, and sideways modes. In other words, "forward mode" refers to the state in which the front end of the first positioning component B110 or the front end of the vehicle body B300 faces the front of the car, "rearward mode" refers to the state in which the front end of the first positioning component B110 or the front end of the vehicle body B300 faces the rear of the car, and "side mode" refers to the state in which the front end of the first positioning component B110 or the front end of the vehicle body B300 faces the side of the car (i.e., the door). The principle and process of the first positioning component B110 rotating relative to the second positioning component B120 and simultaneously displacing are briefly explained below with reference to Figures 55, 56, 60 to 63. Similarly, for the sake of clarity in the following explanation, the intersection center B133 is regarded as point M or point N', the end of the first track segment B1311 away from the intersection center B133 is regarded as point N'', the end of the second track segment B1312 away from the intersection center B133 is regarded as point N, the end of the third track segment B1321 away from the intersection center B133 is regarded as point M', and the end of the fourth track segment B1322 away from the intersection center B133 is regarded as point M''. When the first positioning component B110 is positioned relative to the second positioning component B120 in the first direction F1, the first sliding member B141 is located at the intersection center B133, i.e., point M, and the second sliding member B142 is located at the end of the second track segment B1312 away from the intersection center B133, i.e., point N. When the user needs to switch the orientation of the first positioning component B110 relative to the second positioning component B120 from facing the first direction F1 to facing the second direction F2, it is equivalent to changing the orientation of the first positioning component B110 relative to the second positioning component B120 from facing forward to facing left. The user can pull the first positioning component B110 or the vehicle body B300 to the left, and at the same time, the first positioning component B110 tends to rotate counterclockwise. In this way, the first slider B141 can move from point M to point M' within the second track B132, and at the same time, the second slider B142 can move synchronously from point N to point N' within the first track B131. During this process, the first positioning component B110 gradually begins to rotate relative to the second positioning component B120, and can also move laterally (specifically along the left direction) relative to the second positioning component B120. When the first slider B141 moves to M', the second slider B142 is located at point N', i.e., at the intersection center B133. At this time, the first positioning component B110 is oriented towards the second direction F2 relative to the second positioning component B120. It should be noted that the switching process of the first positioning component B110 relative to the second positioning component B120 towards the first direction F1 and the second direction F2 is reversible. That is, the orientation of the first positioning component B110 relative to the second positioning component B120 can switch from towards the first direction F1 to the second direction F2, or from towards the second direction F2 to the first direction F1. When the user needs to switch the orientation of the first positioning component B110 relative to the second positioning component B120 from facing the first direction F1 to facing the fourth direction F4, the user can pull the first positioning component B110 or the vehicle body B300 to the right, causing the first positioning component B110 to rotate clockwise. This allows the first slider B141 to move from point M to point M'' within the second track B132, while simultaneously causing the second slider B142 to move from point N to point N' within the first track B131. During this process, the first positioning component B110 gradually begins to rotate relative to the second positioning component B120, and can also move laterally (specifically along the right side) relative to the second positioning component B120. When the first slider B141 moves to point M'', the second slider B142 is located at point N', i.e., the intersection center B133, at which point the first positioning component B110 faces the fourth direction F4 relative to the second positioning component B120. Similarly, the switching process of the first positioning component B110 relative to the second positioning component B120 in the direction of the first direction F1 and the fourth direction F4 is reversible. Furthermore, the user can switch the first positioning component B110 relative to the second positioning component B120 from facing the second direction F2 or the fourth direction F4 to facing the third direction F3. The following explanation will use the example of switching the first positioning component B110 relative to the second positioning component B120 from facing the second direction F2 to facing the third direction F3. Specifically, the user can pull the first positioning component B110 or the vehicle body B300, and while pulling, the first positioning component B110 will tend to rotate counterclockwise. This will cause the second sliding member B142 to move from point N' to point N'' within the first track B131, and simultaneously cause the first sliding member B142 to move from point M' to point M within the second track B132. During this process, the first positioning component B110 gradually begins to rotate relative to the second positioning component B120, and the rear end of the first positioning component B110 can move relative to the second positioning component B120 in the first direction F1. When the second slider B142 moves to point N'', the first slider B141 is located at point M, i.e., the intersection center B133. At this time, the first positioning component B110 is oriented towards the third direction F3 relative to the second positioning component B120. Similarly, the switching process of the first positioning component B110 relative to the second positioning component B120 towards the second direction F2 and the third direction F3 is reversible. Furthermore, when the user needs to switch the first positioning component B110 relative to the second positioning component B120 from facing the third direction F3 to facing the fourth direction F4, the user can directly pull the first positioning component B110 or the vehicle body B300, causing the first positioning component B110 to rotate counterclockwise. This allows the first sliding member B141 to move from point M to point M'' within the second track B132, and the second sliding member B142 to move synchronously from point N'' to point N' within the first track B131. Similarly, when the user needs to switch the first positioning component B110 relative to the second positioning component B120 from being oriented towards the fourth direction F4 to being oriented towards the first direction F1, the user can directly pull the first positioning component B110 or the carrier body B300, causing the first positioning component B110 to rotate counterclockwise. This allows the second sliding member B142 to move from point N' to point N within the first track B131, and the first sliding member B141 to move synchronously from point M'' to point M within the second track B132. In some other embodiments, when the carrier body B300 on the first positioning component B110 faces the first direction F1, the position of the second slider B142 on the first positioning component B110 can also be located in front of, to the left of, or to the right of the first slider B141 along the first direction F1. Specifically, when the second slider B142 is located in front of the first slider B141 along the first direction F1, the first positioning component B110 can still rotate and slide relative to the second positioning component B120 simultaneously by the sliding of the first slider B141 within the second track B132. When the second slider B142 is located to the left or right of the first slider B141 along the first direction F1, the first slider B141 will slide within the first slide rail B131, and the second slider B142 will slide within the second slide rail B132. In this way, the first positioning component B110 can rotate relative to the second positioning component B120 while sliding. Referring to Figures 61 to 64, in one embodiment, the second positioning component B120 includes a second housing with a second mounting cavity B121 (or may also be referred to as a mounting cavity). Specifically, the second housing includes a second top cover B122 (or may also be referred to as a top cover) and a second bottom cover B123 (or may also be referred to as a bottom cover), the second top cover B122 and the second bottom cover B123 being vertically connected and enclosing to form a second mounting cavity B121. The first sliding member B141 may include a first sliding rod B1411 and a first slider B1412 connected to each other, and the second sliding member B142 may include a second sliding rod B1421 and a second slider B1422 connected to each other. In one embodiment, referring to Figures 63 and 64, the first track B131 may include a first channel B1313 and a first groove B1314, and the second track B132 may include a second channel B1323 and a second groove B1324. Both the first channel B1313 and the second channel B1323 are located on the lower surface of the second top cover B122, facing the second mounting cavity B121. They intersect and communicate with each other, and both the first channel B1313 and the second channel B1323 are connected to the second mounting cavity B121. The first groove B1314 is located inside the first channel B1313, and the second groove B1324 is located inside the second channel B1323. Both the first groove B1314 and the second groove B1324 are through-slot structures. Specifically, when the first slider B141 slides along the second track B132, it can be considered that the first sliding rod B1411 slides in the second groove B1324, while the first slider B1412 slides in the second channel B1323; when the second slider B142 slides along the first track B131, it can be considered that the second sliding rod B1412 slides in the first groove B1314, while the second slider B1413 slides in the first channel B1313. More specifically, as shown in Figure 64, the width of the first slider B1412 along the first direction F1 or the third direction F3 is greater than the width L2 of the second groove B1324, and the width of the second slider B1422 along the second direction F2 or the fourth direction F4 is greater than the width L3 of the first groove B1314. This prevents the first slider B141 from disengaging from the second track B132 during sliding, and the second slider B142 from disengaging from the first track B131 during sliding, thereby preventing the first positioning component B110 from disengaging from the second positioning component B120 during turning and displacement. Furthermore, the length of the first slider B1412 along the extension direction of the second track B132 is greater than the width W3 of the first channel B1313, and the length of the second slider B1422 along the extension direction of the first track B131 is greater than the width W2 of the second channel B1323.In this way, the first slider B141 is confined to slide within the second track B132, and the second slider B142 is confined to slide within the first track B131, preventing the first slider B141 from entering the first track B131 and the second slider B142 from entering the second track B132. Of course, in other embodiments, the first track B131 and the second track B132 can be groove structures provided on the upper surface of the second top cover B122. The first slider B141 can slide within one of the first track B131 and the second track B132 via the first slider B1412, and the second slider B142 can slide within the other of the first track B131 and the second track B132 via the second slider B1422. In one embodiment, both the first slider B141 and the second slider B142 are integrally formed structures, that is, the first slider B1412 and the first sliding rod B1411 are integrally formed, and the second slider B1422 and the second sliding rod B1412 are integrally formed, and the second slider B1422 and the second sliding rod B1412 are integrally formed. Of course, in other embodiments, the first slider B1412 and the first sliding rod B1411 are different components. The first slider B141 can be formed by connecting the first slider B1412 and the first sliding rod B1411 through welding, riveting, or other methods; similarly, the second slider B1422 and the second sliding rod B1421 are also different components, and the second slider B1422 can be formed by connecting the second slider B1422 and the second sliding rod B1412 through welding, riveting, or other methods. It should be noted that the above-mentioned "through groove structure" refers to a groove that is connected to the second mounting cavity B121, while the "groove structure" refers to a groove that is not connected to the second mounting cavity B121. Referring to Figures 55 to 57, the vehicle body B300 can be, for example, a seat, a carrier, or a sleeping box. As described above, when the vehicle body B1000 is installed inside a vehicle, the vehicle body B300 can rotate to any one of the following directions under the action of the first positioning component B110: a first direction F1, a second direction F2, a third direction F3, or a fourth direction F4. This gives the vehicle body B300 four modes: forward mode, left-facing mode, rear-facing mode, and right-facing mode. Specifically, when it is necessary to place a child in or remove a child from the vehicle body B300, the vehicle body B300 can be in the left-facing or right-facing mode for easy retrieval. When the vehicle needs to move, the vehicle body B300 can be in the forward-facing or rear-facing mode, thus improving the safety of children during travel. Specifically, to further consider the safety of children traveling, especially for younger children (e.g., under 15 months old), shorter children, or lighter children, the vehicle body B300 should not be in forward mode, that is, the vehicle body B300 should not face the front of the car (i.e., the first direction F1). However, in actual use, users may mistakenly adjust the orientation of the first positioning component B110 relative to the second positioning component B120, thereby misusing the forward or rearward mode of the vehicle body B300, posing a safety hazard to children traveling in the vehicle. To prevent users from misusing different usage modes of the vehicle body B300, the positioning component B100 in one embodiment of the fourth aspect of the present invention may further include an anti-misuse mechanism B150. This anti-misuse mechanism B150 may be movably disposed on the first positioning component B110 or the second positioning component B120, and is used to selectively allow or restrict the movement of the sliding components (first slider B141 or second slider B142), thereby selectively restricting the angle of rotation of the first positioning component B110 relative to the second positioning component B120. For example, the anti-misuse mechanism B150 may restrict the movement of the first slider B141, thus restricting the first positioning component B110 from rotating relative to the second positioning component B120 to the second direction F2 or the fourth direction F4. Alternatively, the anti-misuse mechanism B150 may restrict the movement of the second slider B142, thus restricting the first positioning component B110 from rotating relative to the second positioning component B120 to the first direction F1 or the third direction F3. Referring to Figures 65 to 67, in one embodiment, the anti-misuse mechanism B150 includes a blocking member B151. The blocking member B151 is movably disposed on the first positioning component B110 or the second positioning component B120 to extend into or retract from the first track B131 or the second track B132, thereby selectively allowing or restricting the movement of the first slider B141 or the second slider B142. Specifically, the blocking member B151 is movably disposed and has a first position and a second position. In this embodiment, the specific structure and working principle of the anti-misuse mechanism B150 are illustrated by taking the example of the anti-misuse mechanism B150 being movably disposed on the second positioning component B120 and used to restrict the movement of the second slider B142. Specifically, in one embodiment, the blocking member B151 is movably disposed in the second mounting cavity B121 of the second positioning assembly B120. When the blocking member B151 is in the first position (see FIG. 66), the blocking member B151 extends at least partially into the first track B131 to block the movement of the second sliding member B142 within the first track B131, thereby restricting the first positioning assembly B110 from rotating relative to the second positioning assembly B120 in the forward or rearward direction of the vehicle. Specifically, viewed from the intersection center B133, the first track B131 has a first track segment B1311 extending along a first direction F1 and a second track segment B1312 extending along a third direction F3. Therefore, when the blocking member B151 is in the first position, it can be considered to be able to restrict the first positioning assembly B110 from rotating relative to the second positioning assembly B120 in the first direction F1 or the third direction F3. When the blocking member B151 is in the second position (see FIG. 65), the blocking member B151 exits the first track B131. In this way, the first positioning component B110 can rotate freely relative to the second positioning component B120. Referring to Figures 62, 63, 65, and 66, in one embodiment, the blocking member B151 is movably disposed on the movement path of the second sliding member B142 within the second track segment B1312, that is, the blocking member B151 is movably disposed within the area in the second mounting cavity B121 corresponding to the area where the second track segment B1312 is located. Specifically, when the second sliding member B142 moves from the intersection center B133 to the second track segment B1312, and the blocking member B151 is in the first position, the blocking member B151 at least partially extends into the second track segment B1312 to restrict the movement of the second sliding member B142 within the second track segment B1312, thereby restricting the first positioning component B110 from rotating relative to the second positioning component B120 toward the first direction F1. In other words, when the first positioning component B110 switches from the second direction F2 or the fourth direction F4 to the first direction F1 relative to the second positioning component B120, if the blocking member B151 is in the first position, the blocking member B151 will prevent the second sliding member B142 from moving away from the intersection center B133 within the second track section B1312, thereby restricting the first positioning component B110 from rotating to the first direction F1. Consequently, the vehicle body B300 cannot be used facing the first direction F1. This can remind the user and avoid misusing the forward mode of the vehicle body B300. Referring to Figure 66, in one embodiment, the anti-misuse mechanism B150 further includes a first reset member B153. The first reset member B153 abuts against the blocking member B151 to provide an elastic restoring force to the blocking member B151, thereby driving the blocking member B151 to remain constant in a first position. In this embodiment, the blocking member B151 is disposed at the end of the second track segment B1312 away from the intersection center B133. Specifically, referring to Figures 62, 63, 65, and 66, when the first positioning component B110 is oriented towards the first direction F1 relative to the second positioning component B120, the first sliding member B141 is located at the intersection center B133, and the second sliding member B142 is located at the end of the second track segment B1312 away from the intersection center B133. At this time, the blocking member B151 is located directly below the second sliding member B142. More specifically, the blocking member B151 is located directly below the second slider B1422, and is held in the second position by being pressed against by the second slider B1422 (see Figure 65). At this time, the first positioning component B110 can freely switch relative to the second positioning component B120 from the first direction F1 to other directions (such as the second direction F2). More specifically, when the first positioning component B110 switches relative to the second positioning component B120 from the first direction F1 to other directions, the second slider B1422 will move with the second sliding rod B1421 and become misaligned with the blocking member B151. Specifically, when the second slider B1422 is misaligned with the blocking member B151, the blocking member B151 is no longer pressed by the second slider B1422. At this time, under the restoring force of the first reset member B153, the blocking member B151 switches to the first position to extend into the second track segment B1322, thereby preventing the second slider B1422 from moving to the end of the second track segment B1322 away from the intersection center B133, thus restricting the first positioning component B110 from rotating from other directions to facing the first direction F1. It can be seen that the aforementioned blocking member B151 can allow the first positioning component B110 to switch from facing the first direction F1 to other directions, while restricting the first positioning component B110 from switching from other directions to the first direction F1. In some other embodiments, when the first positioning component B110 rotates relative to the second positioning component B120 to face the first direction F1, the first slider B141 is located at the intersection center B133, and the second slider B142 is located at the end of the second track segment B1312 away from the intersection center B133. The blocking component B151 can be offset from the second slider B1422. Specifically, the blocking component B151 is located in front of the second slider B1422 along the first direction F1. At this time, the blocking component B151 does not abut against the second slider B1422. The blocking component B151 is held in the first position by the reset force of the first reset component B153. In this way, the blocking component B151 will prevent the second slider B142 from moving in the second track segment B1312 towards the intersection center B133, thereby restricting the rotation of the first positioning component B110 relative to the second positioning component B120, which in turn prevents the first positioning component B110 from directly switching to the second direction F2 or the fourth direction F4. Of course, in some other embodiments, the blocking member B151 has a guide ramp (not shown) on the side facing away from the intersection center B133. Thus, when the first positioning component B110 is facing the first direction F1, even if the blocking member B151 is in the first position, under the action of the guide ramp, the second slider B1422 can push the blocking member B151 as it slides towards the intersection center B133, causing the blocking member B151 to exit the second track segment B1312. This ultimately allows the first positioning component B110 to rotate relative to the second positioning component B120 from facing the first direction F1 to the second direction F2 or the fourth direction F4, etc. Because the guide ramp is located on the side of the blocking member B151 facing away from the intersection center B133, the first positioning component B110 can switch from facing the first direction F1 to other directions while also restricting the first positioning component B110 from switching from facing other directions (such as the second direction F2 or the fourth direction F4) back to facing the first direction F1, thus preventing the misuse of the forward mode of the vehicle body B300. Of course, in other embodiments, when the first positioning component B110 is oriented relative to the second positioning component B120 in the first direction F1, the second slider B1422 may also have a guide slope on the side near the intersection center B133. This also achieves the aforementioned effect. Referring to Figures 66 to 69, in one embodiment, the anti-misuse mechanism B150 further includes a release component B152. This release component B152 is disposed on the first positioning component B110 or the second positioning component B120 and is drivenly connected to the blocking member B151, for driving the blocking member B151 out of the first track B131 or the second track B132, thereby allowing the movement of the first sliding member B141 or the second sliding member B142. Specifically, in this embodiment, the release mechanism B152 is disposed on the second positioning component B120 and is drivenly connected to the blocking member B151, for driving the blocking member B151 to switch from a first position to a second position. Thus, the first positioning component B110 can freely switch between various directions relative to the second positioning component B120. Referring again to Figures 66 to 69, in one embodiment, the release assembly B152 may include an operating member B1521 and a traction member B1522. The operating member B1521 is movably disposed on the second positioning assembly B120 and has a locked position and an released position. The traction member B1522 is connected between the operating member B1521 and the blocking member B151. Specifically, as shown in Figure 68, the second top cover B122 has a through hole B1222. The operating member B1521 is movably disposed within the second mounting cavity B121. The operating part of the operating member B1521 extends out of the second mounting cavity B121 through the through hole B1222 and protrudes from the surface of the second top cover B122, thus facilitating user operation. As shown in Figures 67, 69, and 70, the traction member B1522 is, for example, a traction rope, which is disposed within the second mounting cavity B121 and connected to the operating member B1521 and the blocking member B151. When the operating member B1521 moves and switches from the locked position to the unlocked position, the operating member B1521 drives the blocking member B151 to exit the first track B131 through the traction member B1522, which is equivalent to driving the blocking member B151 to switch from the first position to the second position (from Figure 66 to Figure 65). Optionally, in some embodiments, the operating component B1521 is provided with a prompt mark, which can be used to directly remind the user whether the first positioning component B110 should be facing the first direction F1. The prompt mark can remind the user through a prompt, pattern, symbol, signal, or alarm. For example, the prompt mark can be ">15 months" and "<15 months". When the operating component B1521 is in the unlocked state, the prompt mark "">15 months" is displayed to remind the user that the first positioning component B110 can be set to face the first direction F1, allowing children older than 15 months to ride in the vehicle body B300 in forward mode; when the operating component B1521 is in the locked state, the prompt mark "<15 months" is displayed to remind the user that the first positioning component B110 cannot be set to face the first direction F1, and the vehicle body B300 cannot use forward mode. Referring to Figures 65 to 67 and Figure 70, in one embodiment, the anti-misuse mechanism B150 further includes a fixing base B154. The fixing base B154 is disposed within the second mounting cavity B121, and has a cavity B1541, a first opening B1542 communicating with the cavity B1541, and an operating hole B1543. The first opening B1542 and the operating hole B1543 are opposite each other and face the first track B131. A first reset member B153 is disposed within the cavity B1541 and abuts against the blocking member B151; that is, the blocking member B151 is movably disposed within the cavity B1541, and the first reset member B153 is disposed within the cavity B1541 and abuts against the blocking member B151 and the fixing base B154. A traction member B1522 passes through the operating hole B1543 and is connected to the blocking member B151. When the blocking member B151 is in the first position, it at least partially passes through the first opening B1542 and extends into the first track B131. Specifically, as shown in Figures 67 and 70, the side wall of the fixing base B154 is provided with a strip-shaped guide groove B1544, and the extending direction of the guide groove B1544 is the same as the moving direction of the blocking member B151. A connecting shaft B156 is inserted through the blocking member B151, which extends into the guide groove B1544 and slides in cooperation with it, so that the blocking member B151 can slide along the guide groove B1544 of the fixing base B154 into or out of the first track B131, thereby restricting or allowing the first positioning assembly B110 to face the first direction F1. Referring to Figures 65 and 66, in one embodiment, "the blocking member B151 at least partially passes through the first opening B1542 and extends into the first track B131" specifically means that the blocking member B151 extends into the first channel B1313 of the second track segment B1312, so that at least a portion of the blocking member B151 is located on the movement path of the second slider B1422, thereby preventing the first positioning assembly B110 from rotating toward the first direction F1. To ensure that the blocking member B151 is stably held in the second position, in one embodiment, as shown in Figures 67 to 69, the anti-misuse mechanism B150 further includes a state locking component B155. This state locking component B155 is disposed on the second positioning component B120 and is used to lock the operating member B1521 in a locked or unlocked position. By locking the operating member B1521 in the unlocked position, the traction member B1522 is kept in a taut state, ultimately holding the blocking member B151 in the second position. Referring to Figures 68 to 72, in one embodiment, the state locking component B155 may include a locking member B1551. The locking member B1551 is movably disposed on the second positioning component B120, specifically, it is movably disposed within the second mounting cavity B121 and has a third position and a fourth position. Specifically, the operating member B1521 is provided with a limiting portion B15211. When the locking member B1551 is in the third position, the locking member B1551 abuts against the limiting portion B15211, thereby restricting the operating member B1521 from switching between the unlocking and locking positions. That is, the locking member B1551 can lock the operating member B1521 in the unlocking or locking position, thus allowing the blocking member B151 to remain in the second or first position. When the locking member B1551 is in the fourth position, the locking member B1551 separates from the limiting portion B15211. In this way, the operating member B1521 can freely switch between the locking and unlocking positions. It should be noted that the moving direction of the operating member B1521 intersects with the moving direction of the locking member B1551. Specifically, in this embodiment, the wall surface in contact with the limiting part B15211 is an arc-shaped structure, and the wall surface in contact with the limiting part B15211 and the locking member B1551 is also an arc-shaped structure. This allows the operating member B1521 to switch between the locked position and the unlocked position, and improves the smoothness of the switching. Specifically, in this embodiment, as shown in Figures 68 to 72, the state locking component B155 may further include a second reset member B1552, which abuts between the second positioning component B120 and the locking member B1551 to provide an elastic restoring force to the locking member B1551, thereby driving the locking member B1551 to be constantly held in the third position. When it is necessary to switch the blocking member B151 from the first position to the second position, the user can operate (e.g., push or pull) the operating member B1521 to move it from the locked position to the unlocked position. During this process, the operating member B1521 can overcome the elastic force of the second reset member B1552 to push the locking member B1551, so that the locking member B1551 can switch from the third position to the fourth position. In addition, during the pushing process, since the wall surface in contact with the locking member B1551 and the limiting part B15211 is an arc-shaped structure, and the wall surface in contact with the limiting part B15211 and the locking member B1551 is also an arc-shaped structure, the limiting part B15211 can overcome the obstruction of the locking member B1551, so that the operating member B1521 can switch to the unlocking position. When the limiting part B15211 passes the locking member B1551, the locking member B1551 automatically switches from the fourth position to the third position under the elastic recoil force of the second reset member B1552. That is, the locking member B1551 switches from one side of the limiting part B15211 to the other side of the limiting part B15211, so that it can again abut against the operating member B1521 (i.e., the other side of the limiting part B15211), locking the operating member B1521 in the unlocked position. Similarly, when it is necessary to switch the blocking member B151 from the second position to the first position, the user can operate the operating member B1521 again to move it from the unlocked position to the locked position. During this process, the operating member B1521 can also overcome the elastic force of the second reset member B1552 to push against the locking member B1551, so that the locking member B1551 switches from the third position to the fourth position again. Similarly, since both the wall surfaces where the locking member B1551 contacts the limiting member B15211 and the wall surfaces where the limiting member B15211 contacts the locking member B1551 are arc-shaped, the limiting member B15211 can overcome the obstruction of the locking member B1551, allowing the operating member B1521 to switch to the locked position. After the limiting member B15211 passes the locking member B1551, the locking member B1551 automatically switches from the fourth position to the third position under the elastic recoil force of the second reset member B1552, so that it can again abut against the operating member B1521 and lock the operating member B1521 in the locked position. The following diagram illustrates the working principle and process of the anti-misuse mechanism B150 in preventing the movement of the second sliding member B142. Referring to Figures 65 to 69, when the operating member B1521 is in the unlocked position, the traction member B1522 is tightened, thereby pulling the blocking member B151 away from the second track segment B1312 of the first track B131. Under the action of the second reset member B1552, the locking member B1551 can be held in the third position, so that the locking member B1551 can abut against the limiting part B15211 of the operating member B1521, so that the operating member B1521 is held in the unlocked position. In this way, the vehicle body B300 can rotate with the first positioning component B110 relative to the second positioning component B120 to face the first direction F1 (refer to Figures 55 and 63). When it is necessary to prevent the user from accidentally switching the first positioning component B110 from any of the directions facing the second direction F2, the third direction F3, or the fourth direction F4 to the first direction F1, as shown in Figures 67 to 69, the operating member B1521 can be operated (e.g., pushed) to switch the operating member B1521 from the unlocked position to the locked position (switching from Figure 59 to Figure 58). During the process of switching the operating member B1521 from the unlocked position to the locked position, it will push the locking member B1551 to move from the third position to the fourth position. After the operating member B1521 is in the locked position, under the action of the second reset member B1552, the locking member B1551 is reset to the third position and abuts against the limiting part B15211 of the operating member B1521, thus keeping the operating member B1521 in the locked position. As the operating member B1521 gradually switches from the unlocked position to the locked position, the traction member B1522 gradually loosens, as shown in Figures 65 and 66. Under the action of the first reset member B153, the blocking member B151 can be driven to switch from the second position to the first position, thereby extending into the second track segment 1312 of the first track 131 to block the second sliding member B142 from moving away from the intersection center B133. This restricts the first positioning component B110 from rotating relative to the second positioning component B120 to face the first direction F1, making it impossible for the vehicle body 300 to switch to the forward mode (see Figures 55 and 56). Similarly, when the user needs to use the forward mode of the vehicle body B300, as shown in Figures 67 to 69, the operating member B1521 can be operated (e.g., pushed) to switch the operating member B1521 from the locked position to the unlocked position (switching from Figure 58 to Figure 59). During the switching process from the locked position to the unlocked position, the operating member B1521 pushes the locking member B1551 to move from the third position to the fourth position. After the operating member B1521 is in the unlocked position, under the action of the second reset member B1552, the locking member B1551 is reset to the third position and abuts against the limiting part B15211 of the operating member B1521, thus keeping the operating member B1521 in the unlocked position. As the operating component B1521 gradually switches from the locked position to the unlocked position, the traction component B1522 is gradually tightened, thereby pulling the blocking component B151 out of the second track segment B1312 of the first track B131, that is, switching from the first position to the second position (see Figures 66 and 65). In this way, the first positioning component B110 rotates relative to the second positioning component B120 to face the first direction F1, so that the vehicle body B300 can switch to the forward mode (see Figures 55 and 56). As described above, when the anti-misuse mechanism B150 is disposed on the movement path of the second slider B142 on the first track B131, it can block the movement of the second slider B142, thereby restricting the first positioning component B110 from rotating relative to the second positioning component B120 in the direction of extension toward the first track B131. Of course, in other embodiments, the anti-misuse mechanism B150 can also be disposed on the movement path of the first slider B141 on the second track B132, thus blocking the movement of the first slider B141 and restricting the first positioning component B110 from rotating relative to the second positioning component B120 in the direction of extension toward the second track B132. Specifically, the working principle of the anti-misuse mechanism B150 in blocking the movement of the first slider B141 can be referred to the working principle of the anti-misuse mechanism B150 in blocking the movement of the second slider B142 described above, and will not be repeated here. In this embodiment, as described above, when the vehicle body B300 on the first positioning component B110 is oriented towards the first direction F1 relative to the second positioning component B120, the position of the second slider B142 on the first positioning component B110 is located behind the first slider B141 along the first direction F1. Of course, in some other embodiments not shown, when the vehicle body B300 on the first positioning component B110 is oriented towards the first direction F1 relative to the second positioning component B120, the position of the second slider B142 on the first positioning component B110 can also be located in front of the first slider B141. In this case, when the first slider B141 is located at the intersection center B133 (i.e., point M), the second slider B142 is located at the first track segment B1311 and at point N'' (see Figure 62). When the first positioning component B110 needs to switch relative to the second positioning component B120 from the first direction F1 to the second direction F2, the user can similarly pull the first positioning component B110 or the vehicle body B300, and while pulling, the first positioning component B110 will tend to rotate counterclockwise. This allows the first sliding member B141 to move from point M to point M'' within the second track B132, and simultaneously allows the second sliding member B142 to move synchronously from point N'' to point N' within the first track B131. During this process, the first positioning component B110 gradually begins to rotate relative to the second positioning component B120, and can also move laterally (specifically along the right side) relative to the second positioning component B120. When the first slider B141 moves to M'', the second slider B142 is located at point N', i.e., the intersection center B133. At this time, the first positioning component 110 faces the second direction F2 relative to the second positioning component B120, and is recessed relative to the left edge of the second positioning component B120, while protruding from the right edge. Therefore, regardless of whether the second slider B142 is positioned in front of or behind the first slider B141 along the first direction F1, the first positioning component B110 can rotate relative to the second positioning component B120 to change its orientation. Specifically, when the carrier body B300 on the first positioning component B110 is oriented towards the first direction F1 relative to the second positioning component B120, and the second slider B142 is located in front of the first slider B141 along the first direction F1, the blocking member B151 is movably disposed on the movement path of the second slider B142 on the first track B131. More specifically, the blocking member B151 is movably disposed within the first track segment B1311. This also restricts the first positioning component B110 from rotating relative to the second positioning component B120 towards the extension direction of the first track B131 (e.g., towards the first direction F1). Specifically, the working principle of the blocking member B151 in preventing the second slider B142 from moving in the first track segment B1311 can be referred to the previous description of the working principle of the blocking member B151 in preventing the second slider B142 from moving in the second track segment B1312, and will not be repeated here. As described above, when the vehicle is in motion, the vehicle body B300 must be oriented towards either the first direction F1 or the third direction F3. Specifically, as shown in Figures 61 and 63, when the first positioning component B110 is oriented towards either the first direction F1 or the third direction F3, the user can lock the first positioning component B100 in this orientation using the locking mechanism B210. This prevents the vehicle body B300 from rotating freely relative to the second positioning component B120 while the vehicle is in motion, thus ensuring the child's safety, especially when the child is in a forward or backward position within the vehicle body B300. More specifically, the locking mechanism B210 can only be used to lock the vehicle body B110 when it is directly oriented towards either the first direction F1 or the third direction F3 relative to the second positioning component B120. To determine whether the first positioning component B110 is facing the first direction F1 or the third direction F3, in one embodiment, the positioning component B100 further includes an engagement indicator mechanism B160 (see Figures 73 and 74). This engagement indicator mechanism B160 can be disposed on the first positioning component B110 or the second positioning component B120 and is used to indicate whether the first positioning component B110 has rotated relative to the second positioning component B120 to an extension direction facing the first track B131; in other words, it can be used to indicate whether the first positioning component B110 is facing the first direction F1 or the third direction F3. Specifically, in this embodiment, the engagement indicator mechanism B160 is located on the second positioning component B120 and is used to indicate whether the first positioning component B110 is facing the first direction F1 or the third direction F3. More specifically, as can be seen from the foregoing, when the first positioning component B110 rotates relative to the second positioning component B120 to face the first direction F1 or the third direction F3, the first sliding member B141 is located at the intersection center B133. Therefore, the engagement indicator mechanism B160 can also be regarded as being used to directly indicate whether the first sliding member B141 is at the intersection center B133, thereby indicating whether the first positioning component B110 is facing the first direction F1 or the third direction F3. Referring to Figures 71, 73 to 75, in one embodiment, the engagement indicator mechanism B160 may include, for example, a movable member B161 and a driving member B162. The movable member B161 has an indicator area B163 and is movably disposed on the second positioning component B120. Specifically, it is movably disposed within the second mounting cavity B121 of the second positioning component B120, so that the indicator area B163 has a first indicator position and a second indicator position. The driving member B162 is rotatably disposed on the second positioning component B120. Specifically, it is rotatably disposed within the second mounting cavity B121 of the second positioning component B120 and is drivenly connected to the movable member B161. More specifically, the driving member B162 is located below and opposite to the cross center B133; in other words, the driving member B162 is located within the second mounting cavity B121 and directly below the cross center B133. The drive element 162 can drive the first slider B141 and drive the movable element B161 to move, thereby changing the position of the indicator area B163. Specifically, during the switching process of the first positioning component B110 from facing the second direction F2 or the fourth direction F4 to facing the first direction F1 or the third direction F3, the first sliding member B141 deviates from the intersection center B133 and does not abut against the driving member B162. The driving member B162 is in a free state (see Figure 71). Both the driving member B162 and the movable member B161 remain stationary, and the indicator area B163 of the movable member B161 is in the first indicator position. When the first positioning component B110 rotates to face the first direction F1 or the third direction F3, which is equivalent to the first sliding member B141 being located at the intersection center B133 (see Figures 65 and 73), the first sliding member B141 pushes the driving member B162 to rotate, thereby driving the movable member B161 to move (for example, move in the direction shown by the first direction F1), thereby changing the position of the indicator area B163, so that the indicator area B163 is in the second indicator position. In other words, when the indicator area B163 is in the first indicator position, it indicates that the first positioning component B110 is not facing the first direction F1 or the third direction F3; when the indicator area B163 is in the second indicator position, it indicates that the first positioning component B110 is facing the first direction F1 or the third direction F3. Thus, the user can directly observe the position of the indicator area B163 to determine whether the first sliding member B141 is pushing against the driving member B162, thereby inferring whether the first positioning component B110 is facing the first direction F1 or the third direction F3. Specifically, in one embodiment, the second positioning component B120 is provided with an indicator window B1221 communicating with the second mounting cavity B121 (see Figures 62 and 70). The indicator area B163 is provided with indicator color blocks (such as green and / or red). When the movable member B161 moves, the indicator area B163 can switch between a first indicator position and a second indicator position, so that the indicator color blocks can selectively face the indicator window B1221. In this way, the indicator color blocks can be viewed through the indicator window B1221 to determine whether the first sliding member B141 is located at the intersection center B133 (i.e., whether the first positioning component B110 is facing the first direction F1 or the third direction F3). For example, when the first slider B141 is deviated from the intersection center B133, which is equivalent to not abutting against the drive member B162, the movable member B161 remains stationary. At this time, the indicator area B163 is in the first indicator position, and the indicator window B1221 is opposite to the indicator color block. The user can view the indicator color block through the indicator window B1221. However, when the first slider B141 is in the intersection center B133, which is equivalent to abutting against the drive member B162, the drive member B162 pivots to drive the movable member B161 to move. At this time, the indicator area B163 is in the second indicator position, and the indicator window B1221 is misaligned with the indicator color block. The user cannot view the indicator color block through the indicator window B1221. In other words, when the indicator window B1221 displays the indicator color block, it indicates that the indicator area B163 is in the first indicator position, and the first positioning component B110 is not facing the first direction F1 or the third direction F3; when the indicator window B1221 does not display the indicator color block, it indicates that the indicator area B163 is in the second indicator position, and the first positioning component B110 is facing the first direction F1 or the third direction F3. At this time, the first positioning component B110 can be locked by the locking mechanism B210. Alternatively, when the first slider B141 deviates from the intersection center B133, which is equivalent to not abutting against the drive member B162, the movable member B161 remains stationary. At this time, the indicator area B163 is in the first indicator position, and the indicator window B1221 is misaligned with the indicator color block, so the user cannot see the indicator color block through the indicator window B1221. However, when the first slider B141 is in the intersection center B133, which is equivalent to abutting against the drive member B162, the drive member B162 pivots to drive the movable member B161 to move. At this time, the indicator area B163 is in the second indicator position, and the indicator window B1221 is opposite to the indicator color block, so the user can see the indicator color block through the indicator window B1221.In other words, when the indicator window B1221 displays an indicator color block, it indicates that the indicator area B163 is in the second indicator position, and the first positioning component B110 is facing the first direction F1 or the third direction F3. At this time, the first positioning component B110 can be locked by the locking mechanism B210. When the indicator window B1221 does not display an indicator color block, it indicates that the indicator area B163 is in the first indicator position, and the first positioning component B110 is not facing the first direction F1 or the third direction F3. Of course, in other embodiments, the indicator area B163 may have two different colored indicator color blocks, namely a first indicator color block (e.g., green) and a second indicator color block (e.g., red). The first indicator color block corresponds to the first slider B141 being located at the intersection center B133, and the second indicator color block corresponds to the first slider B141 being off-center from the intersection center B133. In this way, the user can observe the color change of the indicator color block through the indicator window B1221 to determine whether the first slider B141 is at the intersection center B133. Specifically, when the indicator block displayed in indicator window B1221 is green, it indicates that the first positioning component B110 is facing the first direction F1 or the third direction F3; when the indicator block displayed in indicator window B1221 is red, it indicates that the first positioning component B110 is not facing the first direction F1 or the third direction F3. In summary, the user can determine whether the first positioning component B110 is facing the first direction F1 or the third direction F3 by using the information displayed in indicator window B1221 (such as whether an indicator block is displayed or the color of the indicator block). Referring to Figures 73 to 75, in one embodiment, the driving member B162 has a first pushing portion B1621 and a pushing portion B1622. The pushing portion B1622 is pivotally connected to the movable member B161. The first pushing portion B1621 is used to drive the first sliding member B141, causing the driving member B162 to pivot and drive the movable member B161 to move, thereby changing the position of the indicating area B163. Specifically, when the first sliding member B141 is located at the intersection center B133, the first sliding member B141 pushes against the driving member B162 to cause the driving member B162 to rotate. It should be noted that, in this embodiment, the driving cooperation between the first sliding member B141 and the driving member B162 specifically means that when the first sliding member B141 is located at the intersection center B133, the first slider B1412 in the first sliding member B141 abuts against the first pushing portion B1621 of the driving member B162. More specifically, as shown in Figures 67, 73, and 74, the first sliding member B141 is provided with a second abutting portion B1413. Specifically, the first slider B1412 has a second abutting portion B1413. This second abutting portion B1413 has a pushing inclined surface B1414, which is adapted to abut against the first abutting portion 1621 to drive the driving member B162 to rotate. More specifically, the second abutting portion B1413 at least partially extends through the second track B132 into the second mounting cavity B121 for driving engagement with the first abutting portion B1621 of the driving member B162. It should be noted that the driving engagement between the first sliding member B141 and the driving member B162 is not limited to this. Referring to Figures 71, 74, and 75, in one embodiment, the drive member B162 is pivotally connected within the second mounting cavity B121 and has a pivot axis S1 extending generally along the second direction F2 or the fourth direction F4. The first abutment portion B1621 is generally perpendicular to the pivot axis S1. The first slider B1412 has two abutment ramps B1414 (one on the right is referred to as the first abutment ramp, and the other on the left as the second abutment ramp) facing the drive member B162, and the two abutment ramps B1414 are arranged opposite to each other along the second direction F2 or the fourth direction F4. When the first positioning component B110 switches from facing the second direction F2 to facing the first direction F1 or the third direction F3, the first abutment ramp can abut against the drive member B162 to drive the drive member B162 to rotate. When the first positioning component B110 switches from facing the fourth direction F4 to facing the first direction F1 or the third direction F3, the second pushing slope can push against the driving component B162 to drive the driving component B162 to rotate. Referring to Figures 71 and 75, in one embodiment, the engagement indicator mechanism B160 further includes a third reset member B164. The third reset member B164 abuts between the second positioning component B120 and the movable member B161. When the first sliding member B141 deviates from the cross center B133, the third reset member B164 drives the movable member B161 to reset. When the movable member B161 resets, it can also drive the driving member B162 to reset. Of course, in other embodiments, the third reset member B164 can abut between the second positioning component B120 and the driving member B162. When the first sliding member B141 deviates from the cross center B133, the third reset member B164 drives the driving member B162 to reset, which in turn can also drive the movable member B161 to reset. The following will use relevant diagrams and take the example of indicator area B163 having two indicator blocks (first indicator block and second indicator block) to briefly explain the working process and principle of the locking indicator mechanism B160. Referring to Figures 62, 63, and 71, when the first positioning component B110 is oriented towards the second direction F2 or the fourth direction F4, the first sliding member B141 is respectively located at the end of the third track segment B1321 away from the intersection center B133 or the end of the fourth track segment B1322 away from the intersection center B133, and the second sliding member B142 is located at the intersection center B133. At this time, the driving member B162 is in a free state, the indicator area B163 is in the first indicator position, the first indicator color block is aligned with the display window B1221, and the indicator color block displayed in the display window B1221 is red. Referring to Figures 62, 63, 74, and 75, when the first positioning component B110 switches from the second direction F2 or the fourth direction F4 to the first direction F1 or the third direction F3, the second sliding member B142 gradually moves from the intersection center B133 to the end of the first track B131 away from the intersection center B133. Simultaneously, the first sliding member B141 gradually moves within the second track B132 towards the intersection center B133. During this process, the pushing inclined surface B1414 gradually contacts the first pushing part B1621 of the driving member B162, pushing the driving member B162 to pivot around the pivot axis S1. This causes the pushing part B1622 to push the movable member B161 approximately along the first direction F1, thereby moving the indicating area B163 towards the second indicating position. When the first positioning component B110 faces or is away from the first direction F1, the indicator area B163 is in the second indicator position. At this time, the first indicator color block is aligned with the display window B1221, and the indicator color block displayed in the display window B1221 is green. It should be noted that during the movement of the movable component B163 along the first direction F1, the third reset component B164 will be compressed and in a compressed state. When the first positioning component B110 switches from the first direction F1 or the third direction F3 to the second direction F2 or the fourth direction F4, the first sliding member B141 gradually moves from the intersection center B133 to the end of the second track B132 away from the intersection center B133. At the same time, the second sliding member B142 gradually moves within the first track B131 towards the intersection center B133. During this process, the pushing slope B1414 gradually separates from the first pushing part B1621 of the driving member B162, and the pushing force on the first pushing part B1621 gradually decreases. During this process, the third reset member B164 resets, pushing the movable member B161 to move approximately along the third direction F3, so that the indicating area B163 gradually moves from the second indicating position to the first indicating position. When the pushing slope B1414 separates from the first pushing part B1621, the indicator area B163 is in the first indicator position. At this time, the first indicator color block is aligned with the display window B1221, and the indicator color block displayed in the display window B1221 is red. In other embodiments, when the aforementioned second slider B142 is positioned in front of the first slider B141 along the first direction F1, as described above, after the first positioning component B110 rotates relative to the second positioning component B120 to face the second direction F2, the first positioning component B110 retracts relative to the left edge of the second positioning component B120 and protrudes from the right edge. This increases the distance between the front end of the vehicle body B300 mounted on the first positioning component B110 and the left door, providing more space for the child's feet when sitting sideways. To improve the stability of the child when sitting sideways, the locking mechanism B210 on the positioning component B100 can, for example, be used to lock the first positioning component B110 facing or away from the second direction F2, so that the first positioning component B110 remains facing or away from the second direction F2. Similarly, in order to determine whether the first positioning component B110 is facing or away from the second direction F2, in one embodiment, the engagement indicator mechanism B160 can also be used to indicate whether the first positioning component B110 has rotated relative to the second positioning component B120 to the extension direction of the second track B132; in other words, it can be used to indicate whether the first positioning component B110 is facing the second direction F2 or the fourth direction F4. Specifically, the structure and position of the engagement indicator mechanism B160 in this embodiment can refer to the structure and position of the engagement indicator mechanism B160 in the previous embodiment. The difference is that in this embodiment, the driving member B162 in the engagement indicator mechanism B160 is used to abut against the second sliding member B142, and the pivot axis S1 of the driving member B162 extends approximately along the first direction F1 or the third direction F3. When the second slider B142 moves to the intersection center B133, the second slider B142 can abut against the driving member B162, causing the driving member B162 to pivot, thereby driving the movable member B161 to move to change the position of the indicator area B163. More specifically, the second sliding member B142 is provided with the aforementioned second abutment portion B1413. The second abutment portion B1413 extends at least partially through the first track B131 into the second mounting cavity B121 for driving engagement with the first abutment portion B1621 of the driving member B162. Specifically, the second abutment portion B1413 forms two abutment ramps B1414 (one of which, the front abutment ramp B1414, is referred to as the third abutment ramp, and the other, the rear abutment ramp B1414, is referred to as the fourth abutment ramp). The two abutment ramps B1414 are arranged opposite to each other along the first direction F1 or the third direction F3. When the first positioning component B110 switches from the first direction F1 to the second direction F2 or the fourth direction F4, the fourth abutment ramp can abut against the driving member B162 to drive the driving member B162 to rotate. When the first positioning component B110 switches from the third direction F3 to the second direction F2 or the fourth direction F4, the third abutting inclined surface can abut against the driving component B162 ...

Claims

1. A positioning assembly for mounting a vehicle body to a car seat, comprising: The first positioning component includes a first slider and a second slider; The system includes a second positioning component, comprising a first track and a second track; wherein the first track extends along a first direction or a third direction, and the second track extends along a second direction or a fourth direction, the first track and the second track intersecting to form an intersection center; when the first positioning component is oriented relative to the second positioning component in the first direction, the first slider is located at the intersection center, and the second slider is located on one side of the first slider along the first direction; the first positioning component has a rotation axis, the first slider is coaxially arranged with the rotation axis, and the second slider is offset from the rotation axis; the first slider slides along the second track, and the second slider slides along the first track; when the first positioning component is oriented relative to the second positioning component in the second direction or the fourth direction, the first positioning component retracts inward relative to the second positioning component along the second direction or the fourth direction.

2. The positioning component as described in claim 1, wherein, The first track is divided by the intersection center to form a first track segment and a second track segment, and the second track is divided by the intersection center to form a third track segment and a fourth track segment; when the first positioning component is oriented in the first direction relative to the second positioning component, the first slider is located at the intersection center, and the second slider is located in the first track segment.

3. The positioning component as described in claim 2, wherein, The first track segment extends from the intersection center toward the first direction, and the second track segment extends from the intersection center toward the third direction; the third track segment extends from the intersection center toward the second direction, and the fourth track segment extends from the intersection center toward the fourth direction; the first direction and the third direction are parallel and opposite, the second direction and the fourth direction are parallel and opposite, and the first direction and the second direction intersect.

4. The positioning component as described in claim 2, wherein, The first slider slides along the second track, and the second slider slides along the first track; When the first positioning component is oriented in the second direction relative to the second positioning component, the first slider is located in the fourth track segment and the second slider is located at the intersection center; or when the first positioning component is oriented in the fourth direction relative to the second positioning component, the first slider is located in the third track segment and the second slider is located at the intersection center.

5. A positioning assembly for mounting a vehicle body to a car seat, comprising: A first positioning component is used to connect to the vehicle body; A second positioning component is used to connect the car seat. One of the first and second positioning components has a first track and a second track, and the other has a sliding component. The sliding component slides along the first and second tracks to simultaneously displace the first positioning component relative to the second positioning component. An anti-misuse mechanism is movably disposed on either the first or second positioning component to selectively allow or restrict the movement of the sliding component, thereby selectively restricting the angle of rotation of the first positioning component relative to the second positioning component. The anti-misuse mechanism includes a blocking member movably disposed on one of the first and second positioning components to extend into or retract from one of the first and second tracks. When the blocking member extends into one of the first and second tracks, it prevents the sliding component from sliding along the first and second tracks.

6. The positioning component as described in claim 5, wherein, The sliding assembly includes a first slider and a second slider, wherein the first slider slides along either the first track or the second track, and the second slider slides along the other of either the first track or the second track.

7. The positioning component as described in claim 6, wherein, The first positioning component is provided with a first slider and a second slider, and the second positioning component is provided with a first track and a second track, wherein the first track and the second track form an intersection center at the intersection; The first track extends along a first direction or a third direction, and the second track extends along a second direction or a fourth direction, wherein the first direction is parallel to and opposite to the third direction, the second direction is parallel to and opposite to the fourth direction, and the first direction and the second direction intersect; the first slider slides along the second track, and the second slider slides along the first track.

8. The positioning component as described in claim 7, wherein, When the first slider is located at the intersection center and the second slider is located on the first track, the first positioning component rotates relative to the second positioning component to the extension direction of the first track; and / or when the second slider is located at the intersection center and the first slider is located on the second track, the first positioning component rotates relative to the second positioning component to the extension direction of the second track.

9. The positioning component as described in claim 8, wherein, The blocking member is movably disposed on the movement path of the first slider within the second track to restrict the first positioning component from rotating relative to the second positioning component toward the second direction or the fourth direction.

10. The positioning component as described in claim 8, wherein, The blocking member is movably disposed on the movement path of the second slider within the first track to restrict the first positioning component from rotating relative to the second positioning component toward the first direction or the third direction.

11. The positioning component as described in claim 10, wherein, The blocking member has a first position and a second position; when the blocking member is in the first position, the blocking member extends at least partially into the first track to block the second sliding member from moving within the first track, thereby restricting the first positioning component from rotating relative to the second positioning component to face the first direction or the third direction; when the blocking member is in the second position, the blocking member retracts from the first track.

12. The positioning component as described in claim 11, wherein, The first track is divided by the intersection center to form a first track segment and a second track segment. The first track segment extends from the intersection center toward the first direction, and the second track segment extends from the intersection center toward the third direction. When the first positioning component is oriented toward the first direction relative to the second positioning component, the first slider is located at the intersection center, and the second slider is located in the second track segment. The blocking component is movably disposed on the movement path of the second slider within the second track segment.

13. The positioning component as described in claim 12, wherein, When the second slider moves from the intersection center toward the second track segment and the blocking member is in the first position, the blocking member extends at least partially into the second track segment to restrict the movement of the second slider within the second track segment, thereby restricting the first positioning component from rotating relative to the second positioning component toward the first direction.

14. The positioning component as described in any one of claims 6 to 13, wherein, The anti-misuse mechanism further includes a release component, which is disposed on the first positioning component or the second positioning component and drivenly connected to the blocking member, for driving the blocking member out of the first track or the second track, thereby allowing the movement of the first slider or the second slider.

15. The positioning component as described in claim 14, wherein, The release assembly includes an operating member and a traction member. The operating member is movably disposed on the first positioning component or the second positioning component and has a locked position and a release position. The traction member is connected between the operating member and the blocking member. When the operating member switches from the locked position to the release position, the operating member drives the blocking member to exit the first track or the second track through the traction member. And / or the anti-misuse mechanism further includes a first reset member, which provides an elastic restoring force to the blocking member so that the blocking member extends into the first track or the second track to restrict the movement of the first slider or the second slider.

16. The positioning component as described in claim 15, wherein, The anti-misuse mechanism further includes a status locking component, which is disposed on the second positioning component and used to lock the operating element in the locked position or the unlocked position.

17. The positioning component as described in claim 16, wherein, The operating member is provided with a limiting part; the state locking component includes a locking member and a second reset member, the locking member is movably disposed on the first positioning component or the second positioning component and has a third position and a fourth position; when the locking member is in the third position, the locking member abuts against the limiting part to restrict the operating member from switching between the locked position and the unlocked position; when the locking member is in the fourth position, the locking member is separated from the limiting part; the second reset member is used to provide an elastic restoring force to the locking member so that the locking member is held in the third position.

18. The positioning component as described in any one of claims 5 to 13, wherein, The positioning component further includes an engagement indicator mechanism, which is disposed on the first positioning component or the second positioning component and is used to indicate whether the first positioning component rotates relative to the second positioning component to an extension direction toward the first track or the second track.

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