Rotary structure for trolley and multidirectional conveying system
By designing a rotary structure for trolleys, including the corner mechanism and roller assembly, the problem of roller disengagement during the steering of trolleys is solved, and a more stable clamping effect and more reliable steering performance are achieved.
Patent Information
- Application Number
- CN202421586815.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-05
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-05
AI Technical Summary
In the existing trolley steering structure, the rollers are prone to disengage from the rotary wheel, resulting in the trolley steering failure.
A rotating structure for trolleys is designed, including a corner mechanism and a roller assembly. The angle mechanism matches the snap-in space of the roller assembly through the rotating guide rail, and an angle is formed between the main roller wheel and the auxiliary wheel unit of the roller assembly, increasing the contact area with the rotating guide rail.
By increasing the contact area between the roller assembly and the rotating guide rail, the clamping stability is improved, the risk of the roller assembly leaving the rotating guide rail is reduced, and a more reliable trolley steering is achieved.
Smart Images
Figure CN222906826U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of automated production technology, and in particular to a rotating structure for a trolley and a multi-directional conveying system. Background Art
[0002] In the field of body-in-white welding, a trolley runs on a track in a reciprocating or looping manner to transport work to a designated location or connect workpieces. In the related art, when the trolley needs to turn on the track, the rollers of the trolley are usually clamped into the grooves on the turntable, and the turntable rotates to drive the rollers to rotate, thereby realizing the steering of the trolley. However, in the existing structure where the rollers and the turntable are clamped, the rollers are easily detached from the turntable, resulting in the failure of the trolley to turn. Utility Model Content
[0003] Based on this, it is necessary to provide a rotating structure and a multi-directional conveying system for the trolley to solve the problem of trolley steering.
[0004] A rotating structure for a trolley, the rotating structure for the trolley comprising:
[0005] A corner mechanism, including a rotating guide rail;
[0006] The roller assembly comprises a main roller and an auxiliary wheel unit connected to each other, wherein the main roller is used to be arranged below the body of the trolley, the rotation axis of the main roller and the rotation axis of the auxiliary wheel unit form an angle, and a clamping space for clamping with the rotating guide rail is formed between the main roller and the auxiliary wheel unit;
[0007] When the rotating guide rail is inserted into the engaging space, the rolling surface of the main rolling wheel is in contact with the top wall of the rotating guide rail, and the rolling surface of the auxiliary wheel unit is in contact with the side wall of the rotating guide rail.
[0008] The above-mentioned rotating structure for the trolley forms a snap-in space between the main rolling wheel and the auxiliary wheel unit, and the rotating guide rail of the corner mechanism can be snapped into the snap-in space, thereby realizing the snap-in of the rotating guide rail and the roller assembly. Moreover, when the snap-in space of the rotating guide rail and the roller assembly is snapped, the rotation axis of the main rolling wheel and the rotation axis of the auxiliary wheel unit are set at an angle, so that the rolling surface of the main rolling wheel can fit on the top wall of the rotating guide rail, and the rolling surface of the auxiliary wheel unit fits on the side wall of the rotating guide rail, so that the rolling surface of the roller assembly fits on different areas of the rotating guide rail, thereby increasing the contact area between the roller assembly and the rotating guide rail, improving the snap-in stability, and reducing the risk of the roller assembly detaching from the rotating guide rail. Compared with the existing snap-in structure, the contact area between the roller assembly and the rotating guide rail of the present application is larger, and the snap-in effect is more stable.
[0009] In one embodiment, the auxiliary wheel unit comprises a first auxiliary wheel and a second auxiliary wheel both rotatably connected to the main scroll wheel, the rotation axes of the first auxiliary wheel and the second auxiliary wheel are parallel and perpendicular to the rotation axis of the main scroll wheel, and the clamping space is formed between the main scroll wheel, the first auxiliary wheel and the second auxiliary wheel;
[0010] When the rotating guide rail is inserted into the engaging space, a rolling surface of at least one of the first auxiliary wheel and the second auxiliary wheel is in contact with a side wall of the rotating guide rail.
[0011] In one embodiment, the roller assembly also includes a sleeve plate, which is sleeved on the main rolling wheel, and the main rolling wheel rotates in cooperation with the sleeve plate, the rotation axis of the first auxiliary wheel and the rotation axis of the second auxiliary wheel are both rotationally connected to the sleeve plate, and the rotation axes of the first auxiliary wheel and the second auxiliary wheel are parallel to the extension line of the thickness direction of the sleeve plate, and the rotation axis of the main rolling wheel is perpendicular to the extension line of the thickness direction of the sleeve plate.
[0012] In one embodiment, two first auxiliary wheels are provided, and one second auxiliary wheel is provided. The two first auxiliary wheels can be located on one side of the rotating guide rail, and the second auxiliary wheel can be located on the other side of the rotating guide rail.
[0013] In one embodiment, the corner mechanism also includes a driving member, and a fixed seat and a rotating seat that are rotatably connected. The rotating guide rail is arranged on the side of the rotating seat away from the fixed seat and is fixedly connected to the rotating seat. The output end of the driving member is connected to the rotating seat, and the driving member can drive the rotating seat to rotate to drive the rotating guide rail to rotate.
[0014] In one embodiment, the corner mechanism also includes a limit assembly, which includes an abutment member, a first limit assembly and a second limit assembly, wherein the abutment member is connected to the rotating seat, the first limit assembly and the second limit assembly are both connected to the fixed seat and are arranged at intervals along the circumference of the fixed seat, and the abutment member can abut against the first limit assembly or the second limit assembly to limit the relative rotation position between the rotating seat and the fixed seat.
[0015] In one embodiment, the fixing seat is cylindrical, and the arc length between the first limiting member and the second limiting member accounts for 1 / 4 of the circumference of the fixing seat.
[0016] In one embodiment, the corner mechanism also includes a connected corner frame and a linear guide rail, a plurality of the rotating guide rails are arranged at intervals around the circumference of the corner frame, and the linear guide rail is arranged between two adjacent rotating guide rails. When the vehicle body completes the turning, the vehicle body can slide along the length direction of the linear guide rail.
[0017] In one of the embodiments, one of the end faces of the linear guide rail and the end faces of the rotary guide rail is recessed inwards and the other is protruded outwards, and when the rotary guide rail is configured to rotate at a preset angle, the protrusion is disposed in the recess.
[0018] The present application also provides a multi-directional conveying system, comprising the rotating structure for a trolley as described in any one of the above items.
[0019] The above-mentioned multi-directional conveying system installs the trolley with a rotating structure on the multi-directional conveying system. On the basis of realizing the steering of the trolley, the contact area between the roller assembly and the rotating guide rail is increased, the clamping stability is improved, and the risk of the roller assembly detaching from the rotating guide rail is reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 A schematic structural diagram of a roller assembly installed on the body of a trolley provided in an embodiment of the present application.
[0021] Figure 2 A schematic diagram of the structure of the roller assembly provided in an embodiment of the present application.
[0022] Figure 3 A schematic diagram of the structure of the corner mechanism provided in an embodiment of the present application.
[0023] Figure 4 A schematic diagram of the structure in which the output end of the driving member provided in an embodiment of the present application is connected to the rotating seat.
[0024] Figure 5 A structural schematic diagram of a first perspective showing a roller assembly provided in an embodiment of the present application being clamped on a rotating guide rail.
[0025] Figure 6 A structural schematic diagram from a second perspective of the roller assembly provided in an embodiment of the present application being clamped on a rotating guide rail.
[0026] In the figure:
[0027] 100, trolley; 110, trolley body; 120, roller assembly; 121, main rolling wheel; 122, first auxiliary wheel; 123, second auxiliary wheel; 124, sleeve plate;
[0028] 400, corner mechanism; 410, corner frame; 420, rotating guide rail; 430, driving member; 440, linear guide rail; 450, corner driving motor; 460, fixed seat; 470, rotating seat; 480, limiting assembly; 481, abutting member; 482, first limiting member; 483, second limiting member. DETAILED DESCRIPTION
[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.
[0030] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.
[0031] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0032] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.
[0033] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0034] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.
[0035] The present application provides a rotating structure for a trolley, such as Figures 1 to 6 As shown, the rotating structure for the trolley includes a turning mechanism 400 and a roller assembly 120, and the turning mechanism 400 includes a rotating guide rail 420; the roller assembly 120 includes a main rolling wheel 121 and an auxiliary unit. The main rolling wheel 121 is used to be arranged below the body 110 of the trolley 100, and the rotation axis of the main rolling wheel 121 and the rotation axis of the auxiliary wheel unit are at an angle, and a clamping space for clamping with the rotating guide rail 420 is formed between the main rolling wheel 121 and the auxiliary wheel unit; when the rotating guide rail 420 is clamped into the clamping space, the rolling surface of the main rolling wheel 121 is in contact with the top wall of the rotating guide rail 420, and the rolling surface of the auxiliary wheel unit is in contact with the side wall of the rotating guide rail 420.
[0036] The above-mentioned rotating structure for the trolley forms a clamping space between the main rolling wheel 121 and the auxiliary wheel unit, and the rotating guide rail 420 of the corner mechanism 400 is clamped into the clamping space, thereby realizing the clamping of the rotating guide rail 420 and the roller assembly 120. Moreover, when the clamping space of the rotating guide rail 420 and the roller assembly 120 is clamped, the rotation axis of the main rolling wheel 121 and the rotation axis of the auxiliary wheel unit are set at an angle, so that the rolling surface of the main rolling wheel 121 can be attached to the top wall of the rotating guide rail 420, and the rolling surface of the auxiliary wheel unit is attached to the side wall of the rotating guide rail 420, so that the rolling surface of the roller assembly 120 is attached to different areas of the rotating guide rail 420, thereby increasing the contact area between the roller assembly 120 and the rotating guide rail 420, improving the clamping stability, and reducing the risk of the roller assembly 120 detaching from the rotating guide rail 420. Compared with the existing clamping structure, the contact area between the roller assembly 120 and the rotating guide rail 420 of the present application is larger, and the clamping effect is more stable.
[0037] It should be noted that the rolling surface of the roller refers to the circumferential surface of the roller that contacts and rotates with the road surface or track surface. In the art, the rolling surface of the roller is also referred to as the tread.
[0038] Specifically, the auxiliary wheel unit includes a first auxiliary wheel 122 and a second auxiliary wheel 123, both of which are rotatably connected to the main scroll wheel 121. The rotation axes of the first auxiliary wheel 122 and the second auxiliary wheel 123 are parallel and perpendicular to the rotation axis of the main scroll wheel 121. A clamping space is formed between the main scroll wheel 121, the first auxiliary wheel 122 and the second auxiliary wheel 123. When the rotating guide rail 420 is clamped into the clamping space, the rolling surface of at least one of the first auxiliary wheel 122 and the second auxiliary wheel 123 is attached to the side wall of the rotating guide rail 420. By providing the first auxiliary wheel 122 and the second auxiliary wheel 123, the rotation axes of the first auxiliary wheel 122 and the second auxiliary wheel 123 are parallel, and the rotation axes of the first auxiliary wheel 122 and the second auxiliary wheel 123 are perpendicular to the axis of the main scroll wheel 121. In other words, the main scroll wheel 121, the first auxiliary wheel 122 and the second auxiliary wheel 123 can be attached to different areas of the rotating guide rail 420 respectively, thereby increasing the contact area.
[0039] Specifically, two first auxiliary wheels 122 are provided, and one second auxiliary wheel 123 is provided. The two first auxiliary wheels 122 are located on one side of the rotating guide rail 420, and the second auxiliary wheel 123 is located on the other side of the rotating guide rail 420. Two first auxiliary wheels 122 are provided, and the two first auxiliary wheels 122 are located on one side of the rotating guide rail 420, and their rolling surfaces can be attached to one side wall of the rotating guide rail 420, while the second auxiliary wheel 123 is provided on the other side of the rotating guide rail 420, and its rolling surface can be attached to the other side wall of the rotating guide rail 420. The two first auxiliary wheels 122 and the second auxiliary wheel 123 cooperate with each other, thereby clamping the rotating guide rail 420.
[0040] More specifically, the main scroll wheel 121 is disposed above the auxiliary wheel unit, that is, the main scroll wheel 121 is disposed above the two first auxiliary wheels 122 and the one second auxiliary wheel 123 .
[0041] In this embodiment, when the trolley 100 is disposed on the corner mechanism 400 , the two first auxiliary wheels 122 of the roller assembly 120 are both attached to the side wall of the rotating guide rail 420 , and there is a gap between the second auxiliary wheel 123 and the side wall of the rotating guide rail 420 .
[0042] In other embodiments, when the trolley 100 is disposed on the corner mechanism 400 , the roller assemblies 120 are all in contact with the side walls of the rotating guide rail 420 .
[0043] Furthermore, the roller assembly 120 further includes a sleeve plate 124, which is sleeved on the main scroll wheel 121, and the main scroll wheel 121 is rotationally matched with the sleeve plate 124, the rotation axis of the first auxiliary wheel 122 and the rotation axis of the second auxiliary wheel 123 are both rotationally connected to the sleeve plate 124, and the rotation axes of the first auxiliary wheel 122 and the second auxiliary wheel 123 are parallel to the extension line of the thickness direction of the sleeve plate 124, and the rotation axis of the main scroll wheel 121 is perpendicular to the extension line of the thickness direction of the sleeve plate 124. The sleeve plate 124 is rotationally matched with the main scroll wheel 121, so that the main scroll wheel 121 can rotate relative to the sleeve plate 124. The rotation axes of the first auxiliary wheel 122 and the second auxiliary wheel 123 are both rotated and connected to the sleeve plate 124, so that the first auxiliary wheel 122 and the second auxiliary wheel 123 can rotate relative to the sleeve plate 124. By setting the sleeve plate 124, the connection between the main scroll wheel 121, the first auxiliary wheel 122 and the second auxiliary wheel 123 is realized. The rotation axes of the first auxiliary wheel 122 and the second auxiliary wheel 123 are parallel to the extension line of the thickness direction of the sleeve plate 124, and the rotation axis of the main scroll wheel 121 is perpendicular to the extension line of the thickness direction of the sleeve plate 124, so that the rotation axis of the main scroll wheel 121 is perpendicular to the rotation axis of the first auxiliary wheel 122 and the rotation axis of the second auxiliary wheel 123.
[0044] Further, the corner mechanism 400 also includes a driving member 430, and a fixed seat 460 and a rotating seat 470 that are rotatably connected. The rotating guide rail 420 is arranged on the side of the rotating seat 470 away from the fixed seat 460 and is fixedly connected to the rotating seat 470. The output end of the driving member 430 is connected to the rotating seat 470. The driving member 430 can drive the rotating seat 470 to rotate to drive the rotating guide rail 420 to rotate. The rotating seat 470 is rotatably connected to the fixed seat 460, and the rotating guide rail 420 is connected to one end of the rotating seat 470 away from the fixed seat 460. The output end of the driving member 430 is connected to the rotating seat 470. The driving member 430 can drive the rotating seat 470 to rotate to drive the rotating guide rail 420 to rotate, thereby driving the roller assembly 120 to turn.
[0045] Specifically, the rotating guide rail 420 is clamped on the rotating seat 470 .
[0046] Specifically, the corner mechanism 400 further includes a limit assembly 480, which includes an abutment member 481, a first limit assembly 482, and a second limit assembly 483. The abutment member 481 is connected to the rotating seat 470, and the first limit assembly 482 and the second limit assembly 483 are both connected to the fixed seat 460 and are arranged at intervals along the circumference of the fixed seat 460. The abutment member 481 can abut against the first limit assembly 482 or the second limit assembly 483 to limit the relative rotation position between the rotating seat 470 and the fixed seat 460. By setting the limit assembly 480, the abutment member 481 abuts against the first limit assembly 482 or the second limit assembly 483, thereby limiting the continuous rotation of the rotating seat 470, and also limiting the relative rotation position between the rotating seat 470 and the fixed seat 460.
[0047] More specifically, the fixed seat 460 is cylindrical, and the arc length between the first stopper 482 and the second stopper 483 accounts for 1 / 4 of the circumference of the fixed seat 460. The arc length between the first stopper 482 and the second stopper 483 accounts for 1 / 4 of the circumference of the fixed seat 460, that is, the rotation path of the rotating seat 470 is 1 / 4 of the circumference of the fixed seat 460, that is, the central angle between the first stopper 482 and the second stopper 483 is 90°, that is, the rotation angle of the rotating seat 470 is 90°.
[0048] More specifically, there are multiple rotating guide rails 420, and there are multiple roller assemblies 120, and the multiple roller assemblies 120 correspond to the multiple rotating guide rails 420 one by one, and each rotating guide rail 420 is equipped with a driving member 430, a fixed seat 460, a rotating seat 470, and a limiting assembly 480. The multiple roller assemblies 120 correspond to the multiple rotating guide rails 420 one by one, so that each roller assembly 120 can achieve steering. And each rotating guide rail 420 is equipped with a driving member 430, a fixed seat 460, a rotating seat 470, and a limiting assembly 480, so as to achieve steering and limiting of each rotating guide rail.
[0049] Furthermore, the corner mechanism 400 further includes a corner frame 410 and a linear guide 440 connected to each other, wherein the rotating guides 420 are arranged at intervals around the circumference of the corner frame 410, and a linear guide 440 is provided between two adjacent rotating guides 420, and when the vehicle body 110 completes the turning, the roller assembly 120 can slide along the length direction of the linear guide 440. The two adjacent rotating guides 420 are connected by the linear guide 440, and when the vehicle body 110 and the roller assembly 120 complete the turning, the roller assembly 120 can continue to slide along the length direction of the linear guide 440, thereby driving out of the corner mechanism 400.
[0050] Specifically, the corner mechanism 400 further includes a corner drive motor 450 installed on the corner frame 410 , and the corner drive motor 450 can drive the vehicle body 110 of the trolley 100 to slide on the linear guide rail 440 .
[0051] More specifically, four rotating guide rails 420 and four linear guide rails 440 are provided, and the four rotating guide rails 420 and four linear guide rails 440 are arranged to form a U-shaped installation space. Multiple corner drive motors 450 are provided, and at least part of the multiple corner drive motors 450 are arranged in the installation space.
[0052] Further, specifically, Figures 3 to 5 As shown, one of the end faces of the linear guide 440 and the end face of the rotating guide 420 is concave inwards and the other is convex outwards. When the rotating guide 420 is configured to rotate at a preset angle, the convexity is arranged in the concave. The end face of the linear guide 440 and the end face of the rotating guide 420 are arranged as a concave surface and a convex surface to prevent the rotating guide 420 from colliding with the linear guide 440 when turning.
[0053] Specifically, when the rotating guide rail 420 is configured to rotate 90°, the end surface of the rotating guide rail 420 and the end surface of the linear guide rail 440 cooperate with each other.
[0054] The present application also provides a multi-directional conveying system, including any of the above-mentioned trolley rotating structures. The above-mentioned trolley rotating structure is installed on the multi-directional conveying system, and on the basis of realizing the steering of the trolley 100, the contact area between the roller assembly 120 and the rotating guide rail 420 is increased, the clamping stability is improved, and the risk of the roller assembly 120 being separated from the rotating guide rail 420 is reduced.
[0055] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0056] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.
Claims
1. A rotating structure for a trolley, characterized in that: The rotating structure for the trolley includes: A corner mechanism (400) comprising a rotating guide rail (420); The roller assembly (120) comprises a main roller (121) and an auxiliary wheel unit connected to each other, wherein the main roller (121) is arranged below the body (110) of the trolley (100), the rotation axis of the main roller (121) and the rotation axis of the auxiliary wheel unit form an angle, and a clamping space for clamping with the rotating guide rail (420) is formed between the main roller (121) and the auxiliary wheel unit; When the rotating guide rail (420) is inserted into the engaging space, the rolling surface of the main rolling wheel (121) is in contact with the top wall of the rotating guide rail (420), and the rolling surface of the auxiliary wheel unit is in contact with the side wall of the rotating guide rail (420).
2. The rotating structure for a trolley according to claim 1, characterized in that: The auxiliary wheel unit comprises a first auxiliary wheel (122) and a second auxiliary wheel (123) both of which are rotatably connected to the main scroll wheel (121); the rotation axes of the first auxiliary wheel (122) and the second auxiliary wheel (123) are parallel and perpendicular to the rotation axis of the main scroll wheel (121); and the clamping space is formed between the main scroll wheel (121), the first auxiliary wheel (122) and the second auxiliary wheel (123); When the rotating guide rail (420) is inserted into the engaging space, the rolling surface of at least one of the first auxiliary wheel (122) and the second auxiliary wheel (123) is in contact with the side wall of the rotating guide rail (420).
3. The rotating structure for a trolley according to claim 2, characterized in that: The roller assembly (120) further comprises a sleeve plate (124), wherein the sleeve plate (124) is sleeved on the main rolling wheel (121), and the main rolling wheel (121) and the sleeve plate (124) are rotationally matched, the rotation axis of the first auxiliary wheel (122) and the rotation axis of the second auxiliary wheel (123) are both rotationally connected to the sleeve plate (124), and the rotation axes of the first auxiliary wheel (122) and the second auxiliary wheel (123) are parallel to the extension line of the thickness direction of the sleeve plate (124), and the rotation axis of the main rolling wheel (121) is perpendicular to the extension line of the thickness direction of the sleeve plate (124).
4. The rotating structure for a trolley according to claim 2, characterized in that: Two first auxiliary wheels (122) are provided, and one second auxiliary wheel (123) is provided. The two first auxiliary wheels can be located on one side of the rotating guide rail (420), and the second auxiliary wheel (123) can be located on the other side of the rotating guide rail (420).
5. The rotating structure for a trolley according to claim 1, characterized in that: The corner mechanism (400) further comprises a driving member (430), and a fixed seat (460) and a rotating seat (470) which are rotatably connected. The rotating guide rail (420) is arranged on a side of the rotating seat (470) away from the fixed seat (460) and is fixedly connected to the rotating seat (470). The output end of the driving member (430) is connected to the rotating seat (470). The driving member (430) can drive the rotating seat (470) to rotate so as to drive the rotating guide rail (420) to rotate.
6. The rotating structure for a trolley according to claim 5, characterized in that: The corner mechanism (400) further includes a limit assembly (480), wherein the limit assembly (480) includes an abutment member (481), a first limit assembly (482) and a second limit assembly (483), wherein the abutment member (481) is connected to the rotating seat (470), the first limit assembly (482) and the second limit assembly (483) are both connected to the fixed seat (460) and are arranged at intervals along the circumference of the fixed seat (460), and the abutment member (481) can abut against the first limit assembly (482) or the second limit assembly (483) to limit the relative rotation position between the rotating seat (470) and the fixed seat (460).
7. The rotating structure for a trolley according to claim 6, characterized in that: The fixing seat (460) is cylindrical, and the arc length between the first limiting member (482) and the second limiting member (483) accounts for 1 / 4 of the circumference of the fixing seat (460).
8. The rotating structure for a trolley according to claim 1, characterized in that: The corner mechanism (400) further comprises a corner frame (410) and a linear guide rail (440) connected to each other; a plurality of the rotating guide rails (420) are arranged at intervals in the circumferential direction of the corner frame (410); a linear guide rail (440) is arranged between two adjacent rotating guide rails (420); and when the vehicle body (110) completes the turning, the vehicle body (110) can slide along the length direction of the linear guide rail (440).
9. The rotating structure for a trolley according to claim 8, characterized in that: One of the end faces of the linear guide rail (440) and the end face of the rotary guide rail (420) is recessed inwards and the other is protruded outwards; when the rotary guide rail (420) is configured to rotate at a preset angle, the protrusion is disposed in the recess.
10. A multi-directional conveying system, characterized in that: It comprises the rotating structure for the trolley as described in any one of claims 1-9.