Adapter bracket and wheeled mobile device

Abstract

Disclosed are an adapter bracket for connecting a portable carrier to a wheeled mobile device, and a wheeled mobile device comprising the adapter bracket. The adapter bracket comprises: a base adapted to be detachably mounted to the wheeled mobile device; and a limiting member movably connected to the base. The limiting member has a first position and a second position relative to the base, enabling the adapter bracket to switch between an extended state and a retracted state. When the limiting member is in the first position, the adapter bracket is in the extended state, and the limiting member is used for limiting movement of the portable carrier relative to the base. FIG. 2

Description

[0001] The present disclosure relates to a wheel mobile device capable of carrying a portable carrier, and in particular, to an adapter for connecting a portable carrier to a wheel mobile device. Background Art There are currently wheel mobile devices, such as trolleys, capable of carrying a portable carrier, particularly a portable pet carrier including a pet box, a pet bag, and the like. The portable carrier is detachably mounted to the wheel mobile device to facilitate the carrying of the carrier using the mobility of the wheel mobile device. In order to stably mount the carrier to the wheel mobile device, the portable carrier is usually designed with a structure capable of engaging with a seat assembly of the wheel mobile device or mounted to the wheel mobile device, so as to mount the portable carrier on a frame of the wheel mobile device. A large number of existing portable carriers still cannot be mounted to such wheel mobile devices due to the lack of corresponding engagement mechanisms. Summary of the Disclosure The present disclosure aims to provide an adapter for connecting a portable carrier to a wheel mobile device, which is capable of stably mounting various types of conventional portable carriers to the wheel mobile device without the need to provide corresponding engagement mechanisms on the portable carrier. One aspect of the present disclosure provides an adapter for connecting a portable carrier to a wheel mobile device. The adapter comprises a base adapted to be detachably mounted to the wheel mobile device, and a limiting member movably connected to the base. The limiting member has a first position and a second position relative to the base, so that the adapter is switchable between an unfolded state and a folded state. When the limiting member is in the first position, the adapter is in the unfolded state, and the limiting member is used to limit the movement of the portable carrier relative to the base. In the above first aspect, the limiting member is used to limit the movement of the portable carrier relative to the base in a direction towards the limiting member. In the above first aspect, the adapter further comprises a fixing device connected to the limiting member and adapted to connect the portable carrier to the adapter. In the above first aspect, the adapter is configured such that, when the adapter is mounted to the wheel mobile device, the wheel mobile device can be folded when the adapter is in the folded state. In the above first aspect, the base is provided with a fixing member provided with a first positioning portion adapted to cooperate with a positioning member provided on the portable carrier, and the fixing member is provided at an edge of the base opposite to an end of the base connected to the limiting member. In the above first aspect, the base comprises a first rod member and a second rod member spaced apart in a first direction, and a connecting rod connected between the first rod member and the second rod member.The first rod member and the second rod member are adapted to be detachably mounted to the wheeled mobile device. When the limiting member is in the first position, the limiting member and the first rod member are located on the same side of the adapter frame along the first direction. In the above first aspect, the first rod member comprises a first clamping rod and a first extension rod connected to the first clamping rod. The second rod member comprises a second clamping rod and a second extension rod connected to the second clamping rod. The first extension rod and the second extension rod are spaced apart along the first direction. The distance between the first extension rod and the second extension rod along the first direction is greater than or equal to the distance between the first clamping rod and the second clamping rod along the first direction. In the above first aspect, the first extension rod is collinear with the first clamping rod, and the first clamping rod is parallel to the second clamping rod. Optionally or additionally, the first clamping rod and the second clamping rod are adapted to be clamped by a clamping seat assembly mounted to the wheeled mobile device. In the above first aspect, the limiting member is pivotally connected to the first rod member. Optionally or additionally, the second extension rod is provided with a fixing member, and the fixing member is provided with a first positioning portion adapted to cooperate with a positioning member provided on the portable carrier. In the above first aspect, the base comprises two connecting rods connected between the first extension rod and the second extension rod, respectively. The first rod member comprises two first clamping rods collinear and connected to two ends of the first extension rod, respectively. The second rod member comprises two second clamping rods collinear and connected to two ends of the second extension rod, respectively. In the above first aspect, the limiting member comprises a limiting rod and a side piece connected to the limiting rod. In the above first aspect, the limiting rod comprises a U-shaped middle section and two connecting sections connected to two ends of the middle section, and the two connecting sections are pivotally connected to two ends of the first rod member, respectively. The middle section is connected with the side piece, and when the limiting member is in the first position, the side piece is located at an upper portion of the middle section. In the above first aspect, the limiting member further comprises a cross rod, two ends of the cross rod are connected to the two connecting sections of the limiting rod, or two ends of the cross rod are connected to the middle section of the limiting rod and are spaced apart from a top portion of the middle section. In the above first aspect, the limiting rod is connected with the side piece, and the side piece covers a limiting surface defined by the middle section and the cross rod. In the above first aspect, the limiting member is pivotally connected to the base, and the adapter frame further comprises a rotary joint, the rotary joint comprises a fixed seat and a rotary seat rotatable relative to the fixed seat, the fixed seat is fixed to the base, and the rotary seat is fixed to the limiting member. In the above first aspect,The rotary joint further comprises: a locking member slidably disposed between the fixed seat and the rotary seat relative to the rotary seat, and configured to be movable between a locked position and an unlocked position, the locking member restricting pivoting of the limiting member from the first position to the second position when the locking member is in the locked position, the locking member allowing pivoting of the limiting member from the first position to the second position when the locking member is in the unlocked position; a resilient member configured to bias the locking member towards the locked position; an unlocking button configured to be operable to drive the locking member to move from the locked position to the unlocked position. In the first aspect, the rotary joint further comprises: a positioning member fixed to the fixed seat, and configured to selectively engage with the rotary seat to position the rotary seat at one of a plurality of rotary angles relative to the fixed seat. In the first aspect, the positioning member is provided with a positioning protrusion, and the rotary seat is provided with a positioning recess, the positioning protrusion and the positioning recess cooperate to selectively engage the positioning member with the rotary seat. Optionally or additionally, the positioning member is provided with a slot, and the rotary seat is provided with a limiting protrusion cooperating with the slot, the slot and the limiting protrusion cooperate to limit the range of angles at which the rotary seat is rotatable relative to the fixed seat. In the first aspect, an outer circumferential surface of the rotary seat is provided with a limiting rib, the limiting rib is configured to abut against the fixed seat when the limiting member pivots from the second position to the first position, to prevent the limiting member from further pivoting beyond the first position. In the first aspect, the limiting member is connected to one of two sides of the base along the first direction, a lower portion of the fixed seat is fixed to the base and located on the same side of the base as the limiting member, an upper portion of the fixed seat is inclined away from the other side of the base along the first direction, and the rotary seat is rotatably connected to the upper portion of the fixed seat. In the first aspect, the fixed seat is provided with a second positioning portion adapted to cooperate with a positioning portion of the portable carrier. In the first aspect, the fixing device comprises a strap, a first fastener, and a second fastener configured to detachably engage with the first fastener. One end of the strap is connected to the base, and the other end of the strap is connected to the first fastener. The second fastener is provided on the limiting member. In the first aspect, the fixing device comprises: a strap; a first fastener connected to a first end of the strap; and a second fastener connected to a second end of the strap and configured to detachably engage with the first fastener. The strap comprises a first section extending to the first end, and a second section extending from the first section to the second end. The second section of the strap and the second fastener are fixed to the limiting member.The first section of the strap is a free section. In the first aspect, the fixing device comprises a fixing hook arranged on the limiting member and adapted to engage a fixing strap arranged on a side of the portable carrier. In the first aspect, the fixing hook is arranged on a side of the limiting member facing away from the portable carrier, located at an upper portion of the limiting member, and has a downwardly bent hook portion adapted to hook an upper edge of the fixing strap. In the first aspect, the base is further provided with at least one support block, which is arranged in a first direction apart from the limiting member when the limiting member is in the first position, and is adapted to abut a bottom of the portable carrier. In the first aspect, the at least one support block comprises two support blocks, which are respectively located on opposite sides of the base in a second direction perpendicular to the first direction. A second aspect of the present disclosure provides a wheeled mobile device comprising a frame; a seat assembly mounted on the frame; and an adapter frame detachably connected to the seat assembly and used to connect a portable carrier to the wheeled mobile device. The adapter frame is switchable between an unfolded state and a folded state. The adapter frame is configured such that when the adapter frame is in the folded state, the adapter frame is generally flat, and the wheeled mobile device can be folded. In the process of folding the wheeled mobile device, folding of the frame drives the adapter frame in the folded state to rotate. In the second aspect, the seat assembly is generally located in a first plane. The adapter frame comprises a base generally located in a second plane, which is generally parallel to the first plane. The adapter frame further comprises a limiting member generally located in a third plane. The limiting member is pivotable relative to the base between a first position and a second position, so that the adapter frame is switchable between the unfolded state and the folded state. When the adapter frame is in the folded state, the third plane is generally parallel to the second plane, and is generally parallel to the first plane. In the process of folding the wheeled mobile device, folding of the frame drives the second plane and the third plane to rotate synchronously with the first plane. BRIEF DESCRIPTION OF DRAWINGS The detailed description of exemplary embodiments utilizing the principles of the present disclosure is described below with reference to the following drawings,The features and advantages of the present disclosure will be better understood by reference to the following drawings: Figure 1 shows a wheeled mobile device to which the adapter frame according to the present disclosure can be applied; Figure 2 shows an adapter frame according to a first embodiment of the present disclosure; Figure 3 is a schematic view of connecting a portable carrier to the wheeled mobile device shown in Figure 1 using the adapter frame shown in Figure 2; Figure 4 is a schematic view of the adapter frame shown in Figure 2 in a fastened state; Figure 5 is a schematic view of the adapter frame shown in Figure 4 from another perspective; Figure 6 is a bottom view of a portable carrier to which the adapter frame according to an embodiment of the present disclosure can be applied; Figure 7 is a schematic view of the adapter frame shown in Figure 4 in a folded state; Figure 8 is an enlarged view of region A in Figure 4; Figure 9 is an exploded view of the rotating mechanism in Figure 8; Figure 10 is an exploded view of the rotating mechanism in Figure 8 from another perspective; Figures 11 and 12 are partial sectional views along the direction U1-U1 in Figure 8, showing the swivel joint in a locked state and an unlocked state, respectively; Figure 13 shows the process of folding the adapter frame mounted on the wheeled mobile device together with the wheeled mobile device; Figure 14 shows an adapter frame according to a second embodiment of the present disclosure; Figure 15 is a schematic view of fixing a portable carrier on a wheeled mobile device using the adapter frame shown in Figure 14; Figure 16 is an exploded view of the rotating mechanism in Figure 14; Figure 17 is an exploded view of the rotating mechanism in Figure 14 from another perspective; Figure 18 is a schematic view of the positioning member of the rotating mechanism in Figure 14 mounted on the fixing base; Figure 19 is a schematic view of the swivel base of the rotating mechanism in Figure 14; Figure 20 is a side view of the adapter frame shown in Figure 14, in which the fixing base is removed; Figure 21 shows an adapter frame according to a third embodiment of the present disclosure; Figure 22 is a schematic view of connecting a portable carrier to a wheeled mobile device using the adapter frame shown in Figure 21; Figure 23 shows an adapter frame according to a fourth embodiment of the present disclosure; Figure 24 is a schematic view of the adapter frame in Figure 23 from another perspective; Figure 25 shows an adapter frame according to a fifth embodiment of the present disclosure; Figure 26 is a schematic view of connecting a portable carrier to a wheeled mobile device using the adapter frame shown in Figure 25; Figure 27 shows an adapter frame according to a sixth embodiment of the present disclosure, in which the side panels are removed; Figure 28 is a schematic view of connecting a portable carrier to a wheeled mobile device using the adapter frame shown in Figure 27; Figure 29 is a schematic view of the adapter frame shown in Figure 27 from another perspective, in whichFigure 30 is a side view of the adapter shown in Figure 27 mounted to the cartridge assembly and with the portable carrier placed therein; Figure 31 is an exploded view of the components of the partial structure within region B in Figure 29; Figure 32 is a schematic view of the support block in Figure 30 from another perspective; Figure 33 is a partial cross-sectional view along direction U2-U2 in Figure 29. Legend:

[0002] 10. The adapter;

[0003] 110. The base; 111. The first rod; 111a, the first clamping rod; 111b, the first extension rod; 112. The second rod; 112a, the second clamping rod; 112b, the second extension rod; 113. The connecting rod; 114. The extension rod; 1141. The bending section; 1142. The mounting section; 1151. The limiting hole; 1152. The fastening hole;

[0004] 120. The limiting member; 121. The limiting rod; 1211. The middle section; 1212. The connecting section; 122. The side piece; 123. The cross rod;

[0005] 130. The strap;

[0006] 140. The fixing hook;

[0007] 150. The fixing member; 151. The mounting portion; 152. The first positioning portion;

[0008] 160. The buckle; 161. The first clamping member; 162. The second clamping member;

[0009] 170. The rotating joint; 171. The fixing seat; 1711. The fixing seat body; 1712. The fixing seat connecting portion; 1713. The button accommodating cavity; 1714. The first accommodating cavity; 1715. The partition plate; 1716. The through hole; 1717. The one-way limiting portion; 1718. The clamping protrusion; 1719. The second positioning portion; 172. The rotating seat; 172k The second accommodating cavity; 1722. The ridge; 1723. The limiting rib; 1724. The positioning member accommodating cavity; 1725. The positioning recess; 1726. The limiting protrusion; 173. The locking member; 173L The sliding groove; 1732. The one-way bevel gear; 174. The elastic member; 175. The release button; 1751. The driving leg; 176. The positioning member; 1761. The positioning protrusion; 1762. The fixing hole; 1763. The slot; 1763a. The first end portion; 1763b. The second end portion;

[0010] 180, support block; 181, limiting column; 182, mounting hole;

[0011] 20, wheeled moving device;

[0012] 210, vehicle frame;

[0013] 220, cartridge assembly; 221, carrier frame; 222, locking member; 223, first support portion; 224, second support portion;

[0014] 30. Portable carrier; 310. Positioning member; 320. Fixing strap. In the following detailed description, various aspects of this disclosure will be described. For purposes of explanation, specific details are set forth in order to provide a thorough understanding of this disclosure. It will be apparent to those skilled in the art that other embodiments of this disclosure differ in detail without affecting its essence. Therefore, this disclosure is not limited to what is shown in the drawings and described in the specification, but only as indicated in the appended claims, and the appropriate scope of this disclosure is determined only by the broadest interpretation of the claims. When a feature or element is referred to herein as “on another feature or element,” it may be directly on the other feature or element, or there may be intermediate features and / or elements present. Conversely, when a feature or element is referred to as “directly” on another feature or element, there are no intermediate features or elements present. It should also be understood that when a feature or element is referred to as “connected,” “attached,” or “joined” to another feature or element, it may be directly connected, attached, or joined to the other feature or element, or there may be intermediate features or elements present. Conversely, when a feature or element is referred to as “directly connected,” “directly attached,” or “directly joined” to another feature or element, there is no intermediate feature or element. Spatially related terms, such as “below,” “under,” “above,” “over,” etc., are used herein for ease of description, particularly to describe the positional relationship between one feature or element and another, as shown in the figures. It should be understood that spatially related terms are intended to include different orientations of the device in use or operation, in addition to those shown in the figures. For example, if the device in the figure is inverted, a feature or element described herein as “below” other features or elements would be oriented “above” other features or elements. Thus, the exemplary term “below” can include both above and below orientations. The device may also be oriented otherwise (rotated 90 degrees or in other directions), and the spatially related descriptions used herein are interpreted accordingly. Similarly, unless otherwise specifically indicated, the terms “up,” “down,” “vertical,” “horizontal,” etc., used herein are for illustrative purposes only. While the terms “first” and “second” may be used herein to describe various features or elements, these features or elements should not be limited by these terms unless otherwise specified. These terms may be used to distinguish one feature or element from another. Thus, the first feature or element discussed below may be referred to as the second feature or element, and similarly, the second feature or element discussed below may be referred to as the first feature or element.In this document, "a number of" means at least two, such as two, three, etc., unless expressly and specifically defined otherwise. It is noted that in this document relative terms of orientation, such as "front", "back", "left", "right", etc., are based on the orientation shown in the drawings. The "left" and "right" directions are schematically shown by arrows L, R in the drawings, and the "front" and "back" directions are schematically shown by arrows F, B. For example, "front" means the direction towards which the wheeled mobile device is facing when moving in a forward direction, "back" means the direction away from which the wheeled mobile device is facing when moving in a forward direction, "left" means the "left" as viewed from the back of the wheeled mobile device towards the front, and "right" means the "right" as viewed from the back of the wheeled mobile device towards the front. The vertical direction referred to in this document is the up-down direction of the wheeled mobile device, i.e. the direction perpendicular to the left-right and front-back directions. Other orientation terms referred to in this document that involve "front", "back", "left", "right" have similar meanings. These orientation terms are used only to make the description of the embodiments of the present disclosure clearer, and are not used to improperly limit the scope of protection of the present disclosure. In this document, "longitudinal direction" means the front-back direction of the wheeled mobile device carrying the portable carrier when moving, and "transverse direction" means the left-right direction perpendicular to the front-back direction. When the adapter is mounted on the wheeled mobile device, the longitudinal direction of the adapter corresponds to the longitudinal direction of the wheeled mobile device, and the transverse direction of the adapter corresponds to the transverse direction of the wheeled mobile device. Fig. 1 schematically shows a wheeled mobile device 20 to which the adapter of the present disclosure can be applied. The wheeled mobile device 20 is in the form of, for example, a trolley. The wheeled mobile device 20 comprises a frame 210, and a seat assembly 220 mounted on the frame 210. The seat assembly 220 is adapted to carry and secure a portable carrier having a clamping mechanism capable of being clamped with the seat assembly 220, and the adapter of the present disclosure. The seat assembly 220 comprises a carrier frame 221 for carrying the portable carrier or the adapter, and a locking member 222 for locking the portable carrier or the adapter, so that the portable carrier or the adapter is connected to the carrier frame 221. The seat assembly 220 further comprises a first support portion 223 and a second support portion 224 located on the front and back sides of the carrier frame 221, respectively. In particular, the first support portion 223 extends forward from the front end of the carrier frame 221, and the second support portion 224 extends backward from the back end of the carrier frame 221. In particular, when the wheeled mobile device 20 is located on a flat ground, the top of the first support portion 223 and the top of the second support portion 224 are substantially at the same height relative to the ground.When the portable carrier is placed on the carrier 221, the first support portion 223 and the second support portion 224 abut the front and rear portions of the bottom surface of the portable carrier, respectively. That is, the front and rear portions of the bottom surface of the portable carrier can be supported by the first support portion 223 and the second support portion 224, respectively, so that the portable carrier can be more stably carried on the seat assembly 220, reducing the shaking of the portable carrier due to tilting. In addition, at least one of the first support portion 223 and the second support portion 224 can be designed to have a handle portion to serve as a handle that can be held by a user. For example, when the wheeled mobility device 20 is entirely folded, the handle portion of the first support portion 223 or the second support portion 224 is close to the top of the folded frame 100, so that the user can conveniently move the wheeled mobility device 20 by grasping the handle portion. It can be understood that the wheeled mobility device 20 shown in FIG. 1 is only an example of a wheeled mobility device to which the adapter rack of the present disclosure can be applied, and the adapter rack of the present disclosure can be applied to other types of wheeled mobility devices as long as the wheeled mobility device has a corresponding seat assembly. The adapter rack of the present disclosure can connect the portable carrier to the wheeled mobility device, so that the portable carrier can be carried and moved by the wheeled mobility device. The adapter rack of the present disclosure has an unfolded state and a folded state. When the adapter rack is in the unfolded state, the adapter rack can connect the portable carrier to the wheeled mobility device. When the adapter rack is in the folded state, it can be folded with the wheeled mobility device without being detached from the wheeled mobility device. That is, when the adapter rack is in the folded state, the wheeled mobility device can be folded even if the adapter rack remains installed on the wheeled mobility device. Some embodiments of the adapter rack of the present disclosure will be described below with different embodiments. FIG. 2 is a schematic view of an adapter rack according to a first embodiment of the present disclosure, and FIG. 3 is a schematic view of fixing a portable carrier on the wheeled mobility device shown in FIG. 1 using the adapter rack shown in FIG. 2. As shown in FIG. 3, a portable carrier 30 can be connected to a wheeled mobility device 20 using an adapter rack 10. In this embodiment, the portable carrier 30 has a box-shaped structure and is adapted to carry a pet, which is also called a portable pet carrier. The portable pet carrier includes a pet box, a pet bag, a pet basket, etc. Since the portable carrier 30 is connected to the wheeled mobility device 20 using the adapter rack 10, the portable carrier 30 does not need to be specially designed to have a clamping mechanism that can be clamped with the seat assembly 210 of the wheeled mobility device 20. Referring to FIG. 2, the adapter rack 10 includes a base 110 and a limiting member 120 movably connected to the base 110.The limiting member 120 is configured to limit the movement of the portable carrier 30 relative to the base 110 at least in the direction towards the limiting member 120 when the portable carrier 30 is placed on the base 110. For example, as shown in FIG. 3, the limiting member 120 is located on the left side of the base 110, and the limiting member 120 is located on the left side of the portable carrier 30, so the limiting member 120 can at least block the movement of the portable carrier 30 relative to the base 110 towards the left side. In the present embodiment, the limiting member 120 is pivotably connected to the base 110, and the limiting member 120 is pivotable relative to the base 110 between a first position and a second position, so that the docking station 10 is switchable between the unfolded state and the folded state. When the limiting member 120 is in the first position, the docking station 10 is in the unfolded state. At this time, the limiting member 120 is used to limit the movement of the portable carrier relative to the base 110 in the direction towards the limiting member 120. When the limiting member 120 is in the second position, the docking station 10 is in the folded state. In the present embodiment, when the limiting member 120 is in the first position, the docking station 10 is generally in an L-shaped structure as viewed from the side. In other embodiments, the movable connection manner of the limiting member 120 with the base 110 can also be other manners. For example, the limiting member 120 can be selectively positioned and connected to different positions of the base 110. For another example, the limiting member 120 is detachably connected with the base 110, and the limiting member 120 can be connected to the base 110 in different postures. Specifically, the limiting member 120 can be first separated from the base 110, then the position relationship of the limiting member 120 relative to the base 110 is changed, the posture of the limiting member 120 is adjusted, and then the limiting member 120 is connected to the base 110, so that the limiting member 120 is switchably connected to the base 110 in different postures. As shown in FIGS. 2 and 3, in the present embodiment, the docking station 10 further comprises a strap 130 connected between the base 110 and the limiting member 120. The base 110 is adapted to be detachably mounted to the wheeled mobile device 20. Specifically, the base 110 can be clamped by the locking member 222 of the card seat assembly 220, so as to stably mount the docking station 10 to the bearing frame 221 of the card seat assembly 220. The base 110 comprises a first rod member 111 and a second rod member 112 which are spaced apart along a first direction F1. When the docking station 10 is mounted to the wheeled mobile device 20 as shown in FIG. 3, the first direction F1 corresponds to the left-right direction, i.e., the transverse direction of the wheeled mobile device 20.The first rod 111 and the second rod 112 are adapted to be detachably mounted to the wheeled mobile device 20, for example, by engaging with the mounting bracket 220 to secure the adapter 10 to the wheeled mobile device 20. The base 110 also includes a connecting rod 113 connecting the first rod 111 and the second rod 112. Referring to Figures 4 and 5, the first rod 111 includes a first locking rod 111a and a first extension rod 111b connected to the first locking rod 111a, and the second rod 112 includes a second locking rod 112a and a second extension rod 112b connected to the second locking rod 112a. The first locking rod 111a and the second locking rod 112a are adapted to be engaged by the mounting bracket 220 mounted on the wheeled mobile device 20, for example, by a locking member 222 of the mounting bracket 220. The first extension rod 111b and the second extension rod 112b are spaced apart along a first direction F1. The first clamping rod 111a can be integrally formed with the first extension rod 111b, and the first clamping rod 111a can also be connected to the first extension rod 111b by welding, or connected to the first extension rod 111b by screw connection, clamping connection or the like. Similarly, the second clamping rod 112a can be integrally formed with the second extension rod 112b, and the second clamping rod 112a can also be connected to the second extension rod 112b by welding, or connected to the second extension rod 112b by screw connection, clamping connection or the like. When the first clamping rod 111a is integrally formed with the first extension rod 111b, or the second clamping rod 112a is integrally formed with the second extension rod 112b, the first rod 111 or the second rod 112 is an integral rod, and the first extension rod 111b or the second extension rod 112b is a widened portion of the integral rod, that is, the radial width of the first extension rod 111b or the second extension rod 112b is greater than the radial width of the first clamping rod 111a or the second clamping rod 112a. The wider first extension rod 111b or the second extension rod 112b can enhance the structural strength of the adapter. It can be understood that when the first clamping rod 111a and the first extension rod 111b are separate components, the radial width of the first extension rod 111b can also be designed to be greater than the radial width of the first clamping rod 111a. Correspondingly, when the second clamping rod 112a and the second extension rod 112b are separate components, the radial width of the second extension rod 112b can also be designed to be greater than the radial width of the second clamping rod 112a. The distance between the first extension rod 111b and the second extension rod 112b along the first direction F1 is greater than or equal to the distance between the first clamping rod 111a and the second clamping rod 112a along the first direction F1. As shown in FIGS. 4 and 5, in the embodiment, the first extension rod 111b is collinear with the first clamping rod 111a, and the second extension rod 112b is collinear with the second clamping rod 112a, so the distance between the first extension rod 111b and the second extension rod 112b along the first direction F1 is substantially equal to the distance between the first clamping rod 111a and the second clamping rod 112a along the first direction F1. In some other embodiments, the second clamping rod 112a is parallel to the first clamping rod 111a, but not collinear with the second extension rod 112b, and the distance between the first clamping rod 111a and the second clamping rod 112a along the first direction F1 is less than the distance between the first extension rod 111b and the second extension rod 112b along the first direction F1.In some other embodiments, the first clamping rod 111a can not be collinear with the first extension rod 111b, for example, the first extension rod 111b is farther away from the second rod body 112 than the first clamping rod 111a, and the distance between the first clamping rod 111a and the second clamping rod 112a along the first direction F1 is less than the distance between the first extension rod 111b and the second extension rod 112b along the first direction F1. As shown in FIG. 4 and FIG. 5, in the present embodiment, the base 110 comprises two connecting rods 113. The two connecting rods 113 are connected between the first extension rod 111b and the second extension rod 112b respectively. The first extension rod 111b and the second extension rod 112b are parallel to each other, and the two connecting rods 113 are substantially perpendicular to the first extension rod 111b and the second extension rod 112b. In this way, a more stable structure is formed. In some other embodiments, three or more connecting rods can be provided. Optionally, reinforcing ribs can be provided between the connecting rods 113 to improve the structural strength and stability of the adapter frame 10. In the present embodiment, the connecting rods 113 are connected to the first extension rod 111b and the second extension rod 112b by welding. In some other embodiments, the connecting rods 113 can also be connected to the first extension rod 111b and the second extension rod 112b by fasteners such as threaded fasteners, pin fasteners, rivet fasteners, etc. In the present embodiment, the first rod member 111 comprises two first clamping rods 111a, and the two first clamping rods 111a are collinear and connected to the two ends of the first extension rod 111b respectively. The second rod member 112 comprises two second clamping rods 112a, and the two second clamping rods 112a are collinear and connected to the two ends of the second extension rod 112b respectively. The two first clamping rods 111a and the two second clamping rods 112a are adapted to be clamped by the clamping seat assembly 220 of the wheeled mobile device 20. In some other embodiments, the first rod member 111 can comprise only one first clamping rod 111a, or the second rod member 112 can comprise only one second clamping rod 112a. As shown in FIG. 2 to FIG. 5, the limiting member 120 comprises a limiting rod 121 and a side piece 122. The limiting rod 121 comprises a middle section 1211 and two connecting sections 1212 connected to the middle section 1211. In the present embodiment, the middle section 1211 is substantially in a U-shaped structure, and the two connecting sections 1212 are connected to the two ends of the middle section 1211. In the present embodiment, the middle section 1211 and the connecting sections 1212 are in an integrated structure, and in some other embodiments, the middle section 1211 and the connecting sections 1212 can be in a split structure and connected by welding, buckling, etc. The limiting member 120 is pivotably connected to the base 110 via the two connecting sections 1212.More specifically, in the present embodiment, the two connecting segments 1212 are pivotally connected to the first rod member 111, for example, to two first clamping rods 111a located at the two ends of the first extension rod Hlb of the first rod member 111. The middle segment 1211 of the limiting rod 121 defines a limiting surface. In the present embodiment, when the limiting member 120 is in the first position, the adapter 10 is in the collapsed state, the limiting surface defined by the middle segment 1211 is substantially perpendicular to the plane on which the base 110 lies, and when the limiting member 120 is in the second position, the adapter 10 is in the collapsed position, the limiting surface defined by the middle segment 1211 is substantially parallel to the plane on which the base 110 lies. In particular, when the limiting member 120 is in the first position, the limiting member 120 is located on the same side of the adapter 10 as the first rod member 111 along a first direction. In the present embodiment, the first direction is the transverse direction, and when the limiting member 120 is in the first position, the limiting member 120 is located on the same side of the adapter 10 as the first rod member 111 along the transverse direction. Specifically, in this case, the limiting member 120 is connected to the left side or the right side of the base 110, and accordingly, when the limiting member 120 is in the first position, the limiting member 120 is located on the left side or the right side of the adapter 10. In other embodiments, the first direction can be the longitudinal direction, and when the limiting member 120 is in the first position, the limiting member 120 is located on the same side of the adapter 10 as the first rod member 111 along the longitudinal direction. Specifically, in this case, the limiting member 120 is connected to the front side or the rear side of the base 110, and accordingly, when the limiting member 120 is in the first position, the limiting member 120 is located on the front side or the rear side of the adapter 10. As shown in FIGS. 2-5, the middle segment 1211 of the limiting rod 121 is connected with a side piece 122, and the side piece 122 covers the upper region of the limiting surface defined by the middle segment 1211. The side piece 122 is fixed to the middle segment 1211 of the limiting member 120 and can be made of fabric material such as cloth, or leather material such as natural leather or artificial leather, or plastic material with higher mechanical strength, rigidity and hardness, or even metal material. The side piece 122 can cover at least a portion of the surface of the limiting rod 121, so that this portion of the limiting rod 121 is hidden by the side piece 122, or the limiting rod 121 can be exposed, so that at least a portion of the outer periphery of the side piece 122 is surrounded by the limiting rod 121. The base 110 is provided with a fixing member 150o The fixing member 150 can be provided at the edge of the base 110 formed by the first rod member 111, the second rod member 112, the connecting rod 113, etc.In the present embodiment, the fixing member 150 is disposed at the edge of the other end of the base 110 opposite to the end connected with the limiting member 120, and specifically, the fixing member 150 is disposed at the second extension rod 112b of the second rod member 112. The strap 130 has opposite first and second ends, the first end of the strap 130 is connected to the base 110, and specifically, to the fixing member 150 disposed at the base 110, and the second end of the strap 130 is detachably connected with the side sheet 122 via the buckle 160. Referring to FIG. 5, the side of the fixing member 150 has a mounting portion 151 for mounting the first end of the strap 130. In the present embodiment, the mounting portion 151 is a ring-like structure having a mounting hole, and the first end of the strap 130 is mounted to the mounting portion 151 by passing through the mounting hole of the mounting portion 151, so that the first end of the strap 130 is fixed to the base 110. It can be understood that any suitable manner known in the art can be used to mount the first end of the strap 130 to the mounting portion 151, which will not be described here again. In some other embodiments, the first end of the strap 130 can be directly mounted to the second rod member 112. In the present embodiment, the combination of the strap 130 and the buckle 160 constitutes a fixing device for fixing the portable carrier 30 to the adapter stand 10. The buckle 160 includes a first buckle member 161 and a second buckle member 162 detachably engaged with each other, the first buckle member 161 is disposed at the second end of the strap 130, and the second buckle member 162 is disposed at the side sheet 122. In the present embodiment, since the side sheet 122 is located at the upper region of the limiting surface defined by the middle section 1211, the second buckle member 162 is close to the top of the middle section 1211. It can be understood that the "top" here means the part of the limiting member 120 away from the first rod member 111, and accordingly, the "bottom" of the limiting member 120 or the limiting surface mentioned below means the part of the limiting member 120 close to the first rod member 111. The second buckle member 162 can be fixed to the side sheet 122 by sewing, welding, bonding, etc., or by fasteners such as threaded fasteners, pin fasteners, key fasteners, etc. The buckle 160 can be a snap type buckle. For example, one of the first buckle member 161 and the second buckle member 162 can be a female buckle, and the other one of the first buckle member 161 and the second buckle member 162 can be a male buckle. In the present embodiment, the first buckle member 161 is set as a female buckle, and the second buckle member 162 is set as a male buckle. Alternatively, the first buckle member 161 can be set as a male buckle, and the second buckle member 162 can be set as a female buckle.In the present embodiment, the buckle 160 can be a magnetic buckle which uses magnetic attraction to achieve the connection and fixation of the male buckle and the female buckle. In other embodiments, the buckle 160 can be a plug-in buckle, a clasp buckle, a locking buckle, etc. In other embodiments, the buckle 160 can only include one buckle which is fixedly arranged on the side panel 122, and the second end of the strap 130 is a free end which can be fixed by the buckle, and the buckle can be a Chinese character buckle, a ladder buckle, etc. Referring to FIGS. 4 and 5, in the present embodiment, when the buckle 160 is in the buckled state, i.e., when the first buckle 161 as the female buckle buckles and locks the second buckle 162 as the male buckle, the strap 130 is fixedly connected between the base 110 and the limiting member 120, thereby being able to buckle and connect the portable carrier 30 (not shown in FIGS. 4 and 5, see FIG. 3) to the adapter 10. Referring back to FIG. 2, in the present embodiment, the fixing member 150 is provided with a first positioning portion 152 which is adapted to cooperate with a positioning member 310 (see FIG. 6) arranged on the bottom of the portable carrier 30 to guide the portable carrier 30 to be in the appropriate position relative to the base 110 during the installation of the portable carrier 30 to the base 110 of the adapter 10, and to prevent the portable carrier 30 from shaking relative to the adapter 10 in the first direction F1. In other embodiments, the adapter 10 can also be used to fix a portable carrier which is not provided with the positioning member 310, in which case the bottom of the portable carrier 30 is placed between the fixing member 150 and the limiting member 120. In other embodiments, the positioning member 310 of the portable carrier 30 can also be arranged on the side of the portable carrier 30. In other embodiments, instead of or in addition to being arranged on the second rod member 112, the fixing member 150 can be arranged on at least one of the first rod member 111 and the connecting rod 113. In other embodiments, the fixing member 150 can also not be provided with the first positioning portion 152. It can be understood that the first positioning portion 152 can be arranged at other positions of the base 110. For example, a positioning block can be arranged on at least one connecting rod 113 of the base 110, and the first positioning portion 152 is arranged on the positioning block, and correspondingly, the positioning member 310 can be arranged at the corresponding position of the bottom of the portable carrier 30 to cooperate with the first positioning portion 152.In the embodiment, the first positioning part 152 is a groove structure, and the first positioning part 152 can also be referred to as a first positioning groove. The first positioning part 152 is located at the upper portion of the fixing member 150, and the positioning member 310 of the portable carrier 30 is a protruding structure matched with the first positioning part 152. In other embodiments, the first positioning part 152 can be a protruding structure, a ring structure, a hook structure, or the like, and the positioning member 310 of the portable carrier 30 is a structure matched with the structure. The limiting member 120 is pivotable relative to the base 110, so that the adapter rack 10 is switchable between the unfolded state and the folded state. FIG. 4 and FIG. 5 show the adapter rack 10 in the unfolded state, and FIG. 7 shows the adapter rack 10o in the folded state. Referring to FIG. 4, when the adapter rack 10 is in the unfolded state, the limiting member 120 is in a first position. The limiting member 120 is pivotable relative to the base 110 to a second position in a first rotation direction D1, so as to switch the adapter rack 10 to the folded state. The first rotation direction D1 corresponds to the direction in which the limiting member 120 rotates towards the second rod member 112. The first position of the limiting member 120 can also be referred to as the unfolded position of the limiting member 120, and the second position of the limiting member 120 can also be referred to as the folded position of the limiting member 120. In the embodiment, when the limiting member 120 is in the first position, the limiting member 120 is generally perpendicular to the base 110, that is, generally in a vertical position. It can be understood that in other embodiments, when the limiting member 120 is in the first position, the limiting member 120 can be inclined at an angle relative to the vertical position, so as to adapt to the portable carrier with larger or smaller size and various shapes. In the embodiment, when the limiting member 120 is in the second position, the limiting member 120 is generally parallel to the base 110, that is, generally in a horizontal position. Referring to FIG. 7, when the adapter rack 10 is in the folded state, the limiting member 120 is in the second position. The limiting member 120 is pivotable relative to the base 110 to the first position in a second rotation direction D2 opposite to the first rotation direction D1, so as to switch the adapter rack 10 to the unfolded state. The second rotation direction D2 corresponds to the direction in which the limiting member 120 rotates away from the second rod member 112. In the embodiment, the limiting member 120 is pivotably connected to the base 110 through the rotary joint 170. Specifically, the two connecting segments 1212 of the limiting member 120 are respectively pivotably connected to the two ends of the first rod member 111 through two rotary joints 170, that is, the two first clamping rods 111a of the first rod member 111 are away from the end portions of the first extending rod 111b.The two rotary joints 170 have the same structure, and are configured such that the limiting piece 120 is free to pivot from the second position to the first position along the second rotary direction D2, and the limiting piece 120 is limited to pivot from the first position to the second position along the first rotary direction D1 in the state of the rotary joint 170. The rotary joint 170 has a locked state and an unlocked state, when the rotary joint 170 is in the locked state, the rotation of the limiting piece 120 along the first rotary direction D1 is limited, and when the rotary joint 170 is in the unlocked state, the rotation of the limiting piece 120 along the first rotary direction D1 is allowed. It can be understood that in the embodiment, as long as one of the two rotary joints 170 is in the locked state, the rotation of the limiting piece 120 along the first rotary direction D1 is limited, and only when both of the two rotary joints 170 are in the unlocked state, the rotation of the limiting piece 120 along the first rotary direction D1 is allowed. In some other embodiments, only one rotary joint 170 can be provided, specifically, one of the two connecting segments 1212 is pivotably connected to one end of the first bar 111 through the rotary joint 170, and the other of the two connecting segments 1212 is free to pivot relative to the other end of the first bar 111 in the first rotary direction D1 and the second rotary direction D2. The specific structure of the rotary joint 170 in the embodiment will be described below taking one of the rotary joints 170 as an example. Referring to FIGS. 8-10, the rotary joint 170 includes a fixed seat 171 fixed to the base 110, and a rotary seat 172 fixed to the limiting piece 120. The rotary seat 172 is connected (for example, abuts, or at least a part of one is sleeved outside the other) with the fixed seat 171, and the rotary seat 172 is rotatable relative to the fixed seat 171 about the rotation axis X. The rotary joint 170 further includes a locking piece 173, a resilient piece 174, and an unlocking button 175. The locking piece 173 is slidably arranged between the fixed seat 171 and the rotary seat 172 relative to the rotary seat 172, and is configured to be movable between a locked position and an unlocked position. When the locking piece 173 is in the locked position, the rotation of the rotary seat 172 along the first rotary direction D1 is limited, and when the locking piece 173 is in the unlocked position, the rotation of the rotary seat 172 along the first rotary direction D1 is allowed. The unlocking button 175 is configured to be operable to drive the locking piece 173 to move from the locked position to the unlocked position. The resilient piece 174 is configured to bias the locking piece 173 towards the locked position. When the unlocking button 175 is not operated, the locking piece 173 remains in the locked position under the elastic force of the resilient piece 174.The fixing base 171 comprises a fixing base body 1711 and a fixing base connecting portion 1712 extending from the fixing base body 1711 along the rotation axis X. Specifically, in the embodiment, the fixing base connecting portion 1712 extends from the lower end of the fixing base body 1711. The fixing base connecting portion 1712 is fixed to one end of the first rod member 111. The upper end of the fixing base body 1711 is provided with a button accommodating cavity 1713, a first accommodating cavity 1714 and a partition plate 1715. The release button 175 can be partially accommodated in the button accommodating cavity 1713, and the locking member 173 can be partially accommodated in the first accommodating cavity 1714. The partition plate 1715 separates the button accommodating cavity 1713 and the first accommodating cavity 1714. The partition plate 1715 is provided with a through hole 1716, which communicates the button accommodating cavity 1713 and the first accommodating cavity 1714. The release button 175 is provided with a driving leg 1751 extending in a direction parallel to the rotation axis X, which penetrates the through hole 1716 of the partition plate 1715 and abuts against the locking member 173. The end of the driving leg 1751 is provided with a hook portion. When the locking member 173 pushes the driving leg 1751 under the elastic force of the elastic member 174, the hook portion of the driving leg 1751 hooks the partition plate 1715 to prevent the driving leg 1751 from being separated from the partition plate 1715. In the embodiment, the release button 175 is provided with three driving legs 1751, and the partition plate 1715 is provided with three through holes 1716 corresponding to the positions of the driving legs 1751. It can be understood that the number of driving legs and the number of through holes are not limited by the embodiments disclosed herein, and any number of driving legs and through holes can be provided according to actual needs. The end of the rotating base 172 facing the fixing base 171 is connected (for example, abuts, or at least a part of one is sleeved outside the other) with the fixing base 171, and the end of the rotating base 172 away from the fixing base 171 is fixed to the end of the connecting section 1212. The end of the rotating base 172 away from the fixing base 171 can be fixed to the end of the connecting section 1212 by welding, bonding or the like, or can be fixed to the end of the connecting section 1212 by fasteners such as threaded fasteners, pin fasteners, rivet fasteners and the like, so that the rotating base 172 rotates synchronously with the limiting member 120 around the rotation axis X.The second accommodating cavity 1721 of the rotating seat 172 is formed at one end facing the fixed seat 171, and the locking member 173 is at least partially accommodated in the second accommodating cavity 1721. The outer peripheral surface of the locking member 173 is provided with a plurality of sliding grooves 173L extending in the direction parallel to the rotation axis X. The inner wall of the second accommodating cavity 1721 is provided with a plurality of ridges 1722 corresponding to the number of the sliding grooves 173L. The ridges 1722 are adapted to slide with the sliding grooves 173L to realize the movability of the locking member 173 relative to the rotating seat 172 in the direction of the rotation axis X. In addition, the ridges 1722 are adapted to engage with the sliding grooves 173L to limit the rotation of the rotating seat 172 and the locking member 173 relative to each other around the rotation axis X, that is, the rotating seat 172 and the locking member 173 can only rotate synchronously. It can be understood that the number of the sliding grooves and the number of the ridges are not limited by the embodiments disclosed herein, and any number of sliding grooves and ridges can be provided according to actual needs. The elastic member 174 abuts between the rotating seat 172 and the locking member 173, and is adapted to bias the locking member 173 towards the fixed seat 171. In this embodiment, the elastic member 174 is a compression spring. It can be understood that the elastic member 174 can also be other types of elastic members as long as it can apply a pushing force to the locking member 173 towards the fixed seat 171. The end surface of the locking member 173 facing the fixed seat 171 is provided with a plurality of one-way inclined teeth 1732, which can be arranged at uniform intervals along the circumference of the end surface. The side wall of the first accommodating cavity 1714 of the fixed seat 171 is provided with a plurality of one-way limiting portions 1717, each of which has a blocking surface and a driving inclined surface. The driving inclined surfaces of these one-way limiting portions 1717 form a spiral shape. When the locking member 173 is in the locked position, the one-way inclined teeth 1732 enter the first accommodating cavity 1714 and abut against the one-way limiting portions 1717. At this time, the rotation of the one-way inclined teeth 1732 in the first rotation direction D1 will be blocked by the one-way limiting portions 1717 (i.e., the blocking surface of the one-way limiting portions 1717), so that the locking member 173 cannot rotate in the first rotation direction D1, and accordingly, the rotating seat 172 cannot rotate in the first rotation direction D1. The rotation of the one-way inclined teeth 1732 in the second rotation direction D2 will cause the inclined tooth surface thereof to contact the driving inclined surface of the one-way limiting portions 1717. Under the driving of the driving inclined surface of the one-way limiting portions 1717, the locking member 173 will compress the elastic member 174 to displace in the direction of the rotation axis X away from the fixed seat 171, so that the tooth surface of the one-way inclined teeth 1732 can slide over the driving inclined surface.Therefore, the locking member 173 can rotate in the second rotation direction D2, and accordingly, the rotating seat 172 can rotate in the second rotation direction D2. FIG. 11 shows the rotating joint 170 in the locked state, and FIG. 12 shows the rotating joint 170 in the unlocked state. As shown in FIG. 11, a portion of the locking member 173 is located in the first accommodating cavity 1714, another portion of the locking member 173 is located in the second accommodating cavity 1721, and the locking member 173 is in the locked position. At this time, the rotating seat 172 cannot rotate in the first rotation direction D1, the rotating joint 170 is in the locked state, and the one-way bevel gear 1732 of the locking member 173 is located in the first accommodating cavity 1714. In the locked state of the rotating joint 170, the limiting member 120 cannot be pivoted relative to the base 110 from the first position to the second position, and therefore, the unfolded adapter 10 cannot be folded. When the unlocking button 175 is pressed in the direction along the rotation axis X towards the fixed seat 171, the driving leg 1751 of the unlocking button 175 will push the locking member 173, so that the locking member 173 moves from the locked position to the unlocked position. As shown in FIG. 12, the locking member 173 is separated from the first accommodating cavity 1714, the locking member 173 completely enters the second accommodating cavity 1721 of the rotating seat 172, and the one-way bevel gear 1732 of the locking member 173 is separated from the one-way limiting portion 1717 of the fixed seat 171. At this time, the rotating seat 172 can rotate in the first rotation direction D1, and the rotating joint 170 is in the unlocked state. In the unlocked state of the rotating joint 170, the limiting member 120 can be pivoted relative to the base 110 from the first position to the second position, and therefore, the unfolded adapter 10 can be folded. It can be understood that in other embodiments, when the locking member 173 moves to the unlocked position, the locking member 173 is separated from the second accommodating cavity 1721 of the rotating seat 172, and the locking member 173 completely enters the first accommodating cavity 1714. For example, the unlocking button 175 can be arranged on the side of the rotating seat 172 away from the fixed seat 171, the elastic member 174 can abut between the fixed seat 171 and the locking member 173, and be adapted to bias the locking member 173 towards the rotating seat 172. In addition, in other embodiments, when the position of the unlocking button 175 or the driving mode between the unlocking button 175 and the locking member 173 changes, the unlocking button 175 can not be pressed in the direction along the rotation axis X towards the fixed seat 171.For example, the release button 175 is arranged above the fixed seat or the rotating seat, a part of the release button 175 is provided with a pushing inclined surface and passes through the through hole of the fixed seat or the rotating seat to enter the first accommodating cavity 1714 or the second accommodating cavity 1721, the pushing inclined surface of the release button 175 matches the corresponding pushing inclined surface of the locking piece 173, when the release button 175 is pressed downward, the pushing inclined surface of the release button 175 pushes the corresponding pushing inclined surface of the locking piece 173, drives the locking piece 173 to move along the direction of the rotation axis X, the locking piece 173 is separated from the first accommodating cavity 1714 or the second accommodating cavity 1721, so that the locking piece 173 moves from the locking position to the release position. Referring back to FIG. 8, the limiting rib 1723 is arranged on the outer peripheral surface of the rotating seat 172, when the limiting piece 120 is pivoted to the first position along with the rotation of the rotating seat 172 in the second rotation direction D2, the limiting rib 1723 abuts against the fixed seat connecting portion 1712, so that the limiting piece 120 cannot be further pivoted in the second rotation direction D2 to pass the first position. Therefore, the over-rotation of the rotating seat 172 in the second rotation direction D2 can be prevented, and correspondingly, the over-pivoting of the limiting piece 120 in the second rotation direction D2 can be prevented. It can be understood that the adapter 10 can also be provided with a belt adjusting piece for adjusting the effective length of the belt 130. The belt adjusting piece can be located at the first end, the second end or the middle section between the first end and the second end of the belt 130. The belt adjusting piece includes an adjusting buckle, a buckling piece, a winder and the like. The belt can be an elastic belt which can be elastically stretched and contracted to improve the applicability to portable carriers of different sizes or different shapes. In addition, when the portable carrier 30 is fixed to the adapter 10 by using the belt 130, the contraction elastic force of the belt 130 can help to tighten the portable carrier 30. As described above, the adapter 10 of the present embodiment can fix the portable carrier 30 of different sizes or different shapes to the wheeled mobile device 20, and the adapter 10 can be switched between the unfolded state and the folded state. The adapter 10 in the folded state is small in size, and is convenient to carry and store. When it is desired to unfold the adapter 10 in the folded state, the user can directly pivot the limiting piece 120 relative to the base 110 from the second position to the first position without pressing the release button 175. When the limiting piece 120 is pivoted to the first position, the limiting piece 120 will not be further rotated in the second rotation direction D2 due to the limiting of the limiting rib 1723. Moreover, the limiting piece 120 cannot be rotated in the first rotation direction D1 due to the locking state of the rotating joint 170.When it is desired to fold the adapter 10 in the unfolded state, the user needs to press the release buttons 175. In this embodiment, the user needs to press the two release buttons 175 located at the two ends of the limiting member 120 simultaneously. The pressed release button 175 will push the locking member 173 from the locking position to the release position, so that the rotary joint 170 is in the release state. At this time, the limiting member 120 can be pivoted relative to the base 110 from the first position to the second position, so as to achieve the folding of the limiting member 120. The adapter 10 can be detached from the wheeled mobile device 20 before being folded, or can be folded together with the wheeled mobile device 20 without being detached from the wheeled mobile device 20. Referring to FIG. 13, which shows the process of folding the adapter 10 mounted on the wheeled mobile device 20 together with the wheeled mobile device 20, wherein subgraph 13(a) of FIG. 13 shows the adapter 10 and the wheeled mobile device 20 both in the unfolded state, subgraph 13(b) shows the adapter 10 in the folded state and the wheeled mobile device 20 in the unfolded state, subgraph 13(c) shows the side view of the adapter 10 and the wheeled mobile device 20 both in the folded state, and subgraph 13(d) shows the rear view of the adapter 10 and the wheeled mobile device 20 both in the folded state. For example, the adapter 10 and the wheeled mobile device 20 both in the unfolded state shown in subgraph 13(a) can be switched to the folded state shown in subgraph 13(d) by the following manner: first, fold the adapter 10, i.e., pivot the limiting member 120 relative to the base 110 from the first position to the second position, so that the adapter 10 is in the folded state shown in subgraph 13(b), then fold the frame 210 as shown in subgraph 13(c) and subgraph 13(d), and finally make the whole adapter 10 and wheeled mobile device 20 in the folded state. In this embodiment, as shown in FIG. 13, when the frame 210 is folded, the adapter 10 and the wheeled mobile device 20 are turned over backward and downward together with the adapter 10 and the wheeled mobile device 20, so that the adapter 10 and the wheeled mobile device 20 are directed toward the rear (as shown in subgraph 13(c) and subgraph 13(d) of FIG. 13) after being folded together. It can be understood that in some other embodiments, the adapter 10 and the wheeled mobile device 20 can be directed toward the front or the top after being folded together. Referring to FIG. 1, FIG. 3 and FIG. 13, the adapter 220 mounted on the frame 210 is located in the first plane. When the wheeled mobile device 20 is in the unfolded state, the first plane in which the adapter 220 is located is substantially perpendicular to the vertical direction.Specifically, the carrier 221 of the adapter assembly 220 is generally located in a first plane, which is generally parallel to a horizontal plane when the wheeled mobility device 20 is in the unfolded state. Referring to FIGS. 4, 5, and 7, the base 110 of the adapter 10 is generally located in a second plane. Specifically, the first bar 111, the second bar 112, and the connecting bar 113 of the base 110 are generally located in the second plane. The stopper 120 of the base 110 is generally located in a third plane. When the adapter 10 is in the folded state (i.e., the stopper 120 is pivoted to the second position), the third plane in which the stopper 120 is located is generally parallel to the second plane. In particular, when the adapter 10 is in the folded state, the entire adapter 10 is generally flat. When the adapter 10 is installed on the wheeled mobility device 20, the second plane and the third plane are generally parallel to the first plane when the adapter 10 is in the folded state. In particular, when the wheeled mobility device 20 is in the unfolded state and the adapter 10 is in the folded state, the first plane, the second plane, and the third plane are all generally parallel to the horizontal plane. During folding of the frame 210 so that the adapter 10 and the wheeled mobility device 20 are collectively folded, folding of the frame 210 will cause the adapter 10 in the folded state to rotate, specifically, the second plane in which the base 110 is located and the third plane in which the stopper 120 is located will rotate. During folding of the frame 210, the second plane in which the base 110 is located and the third plane in which the stopper 120 is located will rotate synchronously with the first plane in which the adapter assembly 220 is located. As shown in FIG. 13, when the frame 210 is folded, the first plane in which the adapter 220 is located, the second plane in which the base 110 is located, and the third plane in which the stopper 120 is located will all be flipped back and down together, so that after folding of the frame 210 is completed, the first plane in which the adapter assembly 220 is located, the second plane in which the base 110 is located, and the third plane in which the stopper 120 is located are generally parallel to the vertical direction. In this embodiment, the stopper 120 is connected to one side of the base 110 in a first direction (i.e., the lateral direction). The rotation direction (including the first rotation direction D1 or the second rotation direction D2) of the stopper 120 between the first position and the second position intersects the rotation direction of the adapter assembly 220 when the wheeled mobility device 20 switches between the unfolded state and the folded state. For example, referring to FIG. 13, the stopper 120 is connected to the left side of the base 110. During folding of the adapter 10, the stopper 120 will be pivoted from the first position to the second position in the first rotation direction D1. During folding of the wheeled mobility device 20, the adapter assembly 220 is flipped back.The rotation direction of the card holder assembly 220 intersects with the rotation direction of the limiting member 120. In some other embodiments, the limiting member 120 can be connected to the right side of the base 110, and during the folding of the adapter 10, the limiting member 120 can be pivoted from the first position to the second position in the second rotation direction D2 opposite to the first rotation direction D1, and during the folding of the wheeled mobile device 20, the card holder assembly 220 can be flipped backward, in these cases, similarly, the rotation direction of the card holder assembly 220 intersects with the rotation direction of the limiting member 120. In some other embodiments, the limiting member 120 can be connected to the front side or the rear side of the base 110, in this case, the rotation direction of the limiting member 120 during the folding of the adapter 10 is the same as or opposite to the rotation direction of the card holder assembly 220 during the folding of the wheeled mobile device 20. For example, in the case where the limiting member 120 is connected to the front side of the base 110, during the folding of the adapter 10, the limiting member 120 will be pivoted backward. If during the folding of the wheeled mobile device 20, the card holder assembly 220 is flipped backward, then the rotation direction of the limiting member 120 during the folding of the adapter 10 is the same as the rotation direction of the card holder assembly 220 during the folding of the wheeled mobile device 20, and if during the folding of the wheeled mobile device 20, the card holder assembly 220 is flipped forward, then the rotation direction of the limiting member 120 during the folding of the adapter 10 is opposite to the rotation direction of the card holder assembly 220 during the folding of the wheeled mobile device 20. Similar situations also exist when the limiting member 120 is connected to the rear side of the base 110, which will not be described here. It can be understood that during the folding of the wheeled mobile device 20, the adapter 10 that has been in the folded state will not interfere with the folding of the wheeled mobile device 20. As shown in FIG. 7, when the adapter 10 is in the folded state, the top of the limiting member 120 does not exceed the side of the second rod member 112 of the base away from the second rod member 111 in the first direction, or the fixing member 150 provided on the base. Specifically, in the case where the fixing member 150 is provided on the second extension rod 112b of the second rod member 112, the top of the limiting member 120 does not exceed the fixing member 150, and accordingly, the top of the limiting member 120 also does not exceed the second extension rod 112b. In the case where the second extension rod 112b is collinear with the second clamping rod 112a, the top of the limiting member 120 also does not exceed the second clamping rod 112a.In the case that the second extension rod 112b is not collinear with the second clamping rod 112a, for example, in the case that the second clamping rod H2a is closer to the first clamping rod Hla in the first direction than the second extension rod 112b is to the first clamping rod Hla in the first direction, the top of the limiting member 120 can exceed the second clamping rod 112a, but not exceed the second extension rod 112b and the fixing member 150 arranged on the second extension rod 112b. In the case that the adapter 10 is connected to the card holder assembly 220, the adapter 10 is carried on the carrying frame 221 of the card holder assembly 220. The carrying frame 221 encloses a carrying surface. At least a major part of the projection of the base 110 on the plane where the carrying surface is located overlaps the carrying surface. Specifically, the projection of the base 110 on the plane where the carrying surface is located is generally located in the carrying surface. For example, in the embodiment, the base 110 is generally a rectangular frame structure. The rectangular frame structure is composed of the first rod member 111, the second rod member 112 and the two connecting rods 113. The projection of the rectangular frame structure on the plane where the carrying surface is located is generally located in the carrying surface. Specifically, the projection of the area enclosed by the first rod member Hk the second rod member 112 and the two connecting rods 113 on the plane where the carrying surface is located can be located in the carrying surface, only the end of the first rod member 111 connected to the rotary joint 170 can be located outside the carrying surface. The card holder assembly 220 has a receiving cavity that receives at least a part of the base 110. When the first clamping rod Hla and the second clamping rod 112a of the base 110 are clamped to the card holder assembly 220, the two connecting rods 113 of the base 110 are located in the receiving cavity, and the middle part of the first clamping rod Hla and the second clamping rod 112a is located in the receiving cavity. When the adapter 10 is in the collapsed state, the projection of the limiting member 120 on the plane where the base 110 is located (i.e., the second plane) does not exceed the rectangular frame structure of the base 110. Accordingly, the projection of the limiting member 120 on the plane where the carrying surface is located is generally located in the carrying surface. Specifically, the projection of the limiting surface defined by the middle segment 1211 of the limiting rod 121 on the plane where the carrying surface is located can be located in the carrying surface, only the end of the connecting segment 1212 of the limiting rod 121 connected to the rotary joint 170 can be located outside the carrying surface. In particular, in the case that the side piece 122 is connected to the middle segment 1211 of the limiting rod 121, the projection of the side piece 122 on the plane where the carrying surface is located can be completely located in the carrying surface; in the case that the limiting member 120 is directly formed by a plate-shaped structure serving as the side piece 122, the projection of the side piece 122 on the plane where the carrying surface is located can be generally located in the carrying surface.As can be understood, when the adapter 10 is in the collapsed state, the adapter 10 is generally flat, and the third plane in which the limiting member 120 is located is generally parallel to the second plane in which the base 110 is located. The collapsed adapter 10 occupies a small space. In addition, during the collapsing of the wheeled mobile device 20, the flat adapter 10 in the collapsed state is flipped over with the folding of the vehicle frame 210, so as to be flipped from a plane generally perpendicular to the vertical direction to a plane generally parallel to the vertical direction. Thus, the collapsed wheeled mobile device 20 occupies a small space. Therefore, even if the adapter 10 is installed, the volume of the collapsed wheeled mobile device 20 will not be significantly increased due to the adapter 10. FIG. 14 shows an adapter according to a second embodiment of the present disclosure, and FIG. 15 is a schematic view of fixing a portable carrier to a wheeled mobile device by using the adapter shown in FIG. 14. In the following, the differences between the present embodiment and the first embodiment will be mainly described, and the same or similar parts as the first embodiment will not be described herein again. As shown in FIG. 14, the limiting member 120 of the adapter 10 further comprises a crossbar 123. In the present embodiment, the two ends of the crossbar 123 are respectively connected to the two connecting segments 1212, and the crossbar 123 and the connecting segments 1212 are arranged in a generally collinear manner. More specifically, the crossbar 123 and the connecting segments 1212 are of an integrated structure, but are not limited thereto. In the present embodiment, the middle segment 1211 of the limiting rod 121 is connected to the connecting segment 1212 by welding. In other embodiments, the middle segment 1211 of the limiting rod 121 can also be connected to the connecting segment 1212 by a fastener such as a threaded fastener, a pin fastener, a dowel fastener, etc. Similarly, the two connecting segments 1212 can be fixed to the corresponding rotary seat 172 by welding, bonding, etc., or can be fixed to the corresponding rotary seat 172 by a fastener such as a threaded fastener, a pin fastener, a dowel fastener, etc., so that the limiting rod 121 can rotate synchronously with the rotary seat 172 about the rotation axis X. In the present embodiment, the middle segment 1211 of the limiting rod 121 and the crossbar 123 define a limiting surface. The side piece 122 completely covers the limiting surface, and the second fastener 162 is arranged at the lower part of the side piece 122, i.e., close to the crossbar 123 (corresponding to the bottom of the limiting rod 121 or the limiting surface) and arranged on the side piece 122.It can be understood that, in other embodiments, the two ends of the cross bar 123 are connected to the middle section (i.e., the cross bar 123 is connected between two sections of the middle section 1211 of the U-shaped structure) and are spaced apart from the top of the middle section 1211, and the cross bar 123 and the connecting section 1212 can be arranged not to be collinear, for example, the cross bar 123 is farther away from the base relative to the connecting section 1212. It can be understood that, in other embodiments, the limiting member 120 can be directly formed by a plate-shaped structure (for example, a plate-shaped structure made of metal or plastic material) that defines the limiting surface, and the plate-shaped structure corresponds to the side piece 122 in the embodiment and does not include the limiting rod 121 in the embodiment. See FIGS. 16-19, the rotary joint 170 includes a fixed seat 171, a rotary seat 172, and a positioning member 176. The rotary seat 172 is connected to the fixed seat 171, and the rotary seat 172 is rotatable relative to the fixed seat 171 at a plurality of rotation angles about the rotation axis X. The positioning member 176 is fixed to the fixed seat 171 and is configured to selectively engage the rotary seat 172 to position the rotary seat 172 at one of the plurality of rotation angles. In the embodiment, the positioning member 176 is generally plate-shaped, and the positioning member 176 has a generally circular shape in the axial cross section of the rotation axis X. The positioning member 176 is provided with a positioning protrusion 1761, and in particular, the outer peripheral surface of the positioning member 176 is formed with two radially symmetrical positioning protrusions 1761. The positioning member 176 is provided with two radially symmetrical fixing holes 1762 and two radially symmetrical slots 1763, and the two fixing holes 1762 and the two slots 1763 are alternately arranged in the circumferential direction of the positioning member 176. The two slots 1763 are both circular arcs, and the two circular arc-shaped slots 1763 have the same radius, i.e., they have the same distance to the center of the positioning member 176. The fixed seat 171 includes a fixed seat body 1711 and a fixed seat connecting portion 1712 extending from the lower end of the fixed seat body 1711 along the rotation axis X. The fixed seat connecting portion 1712 is fixed to one end of the first rod member 111. In the embodiment, the first rod member 111 is a one-piece rod member, and the second rod member 112 is also a one-piece rod member. The end of the fixed seat body 1711 facing the rotary seat 172 is connected to the rotary seat 172 and is provided with two clamping protrusions 1718 adapted to pass through the two fixing holes 1762 of the positioning member 176, respectively. The clamping protrusions 1718 match the shape of the radial cross section of the fixing holes 1762 to tightly fix the positioning member 176 to the fixed seat 171, so that the positioning member 176 cannot rotate relative to the fixed seat 171.In the embodiment, the positioning member 176 is provided with two fixing holes 1762, and the fixing seat 171 is correspondingly provided with two clamping protrusions 1718 corresponding to the positions of the two fixing holes 1762. It can be understood that the number of fixing holes and the number of clamping protrusions are not limited by the embodiments disclosed herein, and any number of fixing holes and clamping protrusions can be provided according to actual needs. In addition, the positioning member 176 can also be fixed to the fixing seat 171 in any other suitable manner, for example, the positioning member 176 can be fixed to the fixing seat 171 by welding, bonding or the like, or the positioning member 176 can be fixed to the fixing seat 171 by fasteners such as threaded fasteners, pin fasteners, rivet fasteners and the like. The end of the rotating seat 172 facing the fixing seat 171 is connected (for example, abuts, or at least a part of one is arranged outside the other) to the fixing seat 171, and the end of the rotating seat 172 away from the fixing seat 171 is fixed to the end of the connecting section 1212. The end of the rotating seat 172 away from the fixing seat 171 can be fixed to the end of the connecting section 1212 by welding, bonding or the like, or can be fixed to the end of the connecting section 1212 by fasteners such as threaded fasteners, pin fasteners, rivet fasteners and the like, so that the rotating seat 172 rotates synchronously with the limiting rod 121 around the rotation axis X. The end of the rotating seat 172 facing the fixing seat 171 is formed with a positioning member accommodating cavity 1724, and at least a part of the positioning member 176 fixed to the fixing seat 171 is accommodated in the positioning member accommodating cavity 1724 when the rotating seat 172 is connected to the fixing seat 171. The rotating seat 172 is provided with positioning recesses 1725 which cooperate with the positioning protrusions 1761 to selectively engage the positioning member 176 with the rotating seat 172. In particular, the side wall of the positioning member accommodating cavity 1724 is formed with two pairs of positioning recesses 1725. See FIG. 20, the shape of the positioning recesses 1725 matches the shape of the positioning protrusions 1761 formed on the outer circumferential surface of the positioning member 176. When the positioning member 176 is placed in the positioning member accommodating cavity 1724, the two positioning protrusions 1761 are respectively located in the two pairs of positioning recesses 1725. The positioning protrusions 1761 are configured to be deformable, and when a torsion is applied to the rotating seat 172 to rotate the rotating seat 172 relative to the fixing seat 171, the positioning protrusions 1761 are adapted to slide from the current positioning recess 1725 into the positioning recess 1725 adjacent thereto. Specifically, when the rotating seat 172 rotates relative to the fixing seat 171, the positioning protrusions 1761 are deformed under compression, and the slots 1763 provide space for the deformation of the positioning protrusions 1761 to allow the positioning protrusions 1761 to shift inwardly in the radial direction of the positioning member 176, thereby avoiding wear of the positioning protrusions 1761.In the present embodiment, within a predetermined angle range, i.e., from the second position of the limiting member 120 to the first position, and from the first position of the limiting member 120 to the second position, the rotation of the rotating seat 172 in the first rotation direction D1 and the second rotation direction D2 is not limited. That is, as long as the torsion applied to the rotating seat 172 is greater than the resistance generated by the deformation of the positioning convex 1761 to the rotation of the positioning concave 1725, the rotating seat 172 can rotate in either of the first rotation direction D1 and the second rotation direction D2. It can be understood that for the two pairs of positioning concaves 1725, the number of each group of positioning concaves 1725 can determine the number of angles at which the rotating seat 172 can be positioned relative to the fixed seat 171, i.e., the number of angles at which the limiting member 120 can be positioned relative to the base 110. The number of each group of positioning concaves 1725 can be set according to actual needs. In addition, it can be understood that the number of positioning convexes 1761 can also be set according to actual needs, for example, only one positioning convex 1761 can be provided, or more than three positioning convexes 1761 can be provided. In the present embodiment, the rotating seat 172 is provided with a limiting convex 1726 matched with the slot 1763 of the positioning member 176, to limit the angle range at which the rotating seat 172 can rotate relative to the fixed seat 171, i.e., the angle range at which the limiting member 120 can pivot relative to the base 110. Referring to FIGS. 16, 19 and 20, the bottom of the positioning member accommodating cavity 1724 of the rotating seat 172 is provided with two limiting convexes 1726 extending toward the fixed seat 171 in a direction parallel to the rotation axis X. When the positioning member 176 is placed in the positioning member accommodating cavity 1724, the two limiting convexes 1726 are adapted to be inserted into the two slots 1763 of the positioning member 176. The slot 1763 has a first end 1763a and a second end 1763b. When the limiting member 120 is in the second position, the limiting convex 1726 abuts against the first end 1763a of the slot 1763, and the first end 1763a of the slot 1763 can prevent the limiting member 120 from further pivoting in the first rotation direction D1. When the limiting member 120 is in the first position (see FIG. 20), the limiting convex 1726 abuts against the second end 1763b of the slot 1763, and the second end 1763b of the slot 1763 can prevent the limiting member 120 from further pivoting in the second rotation direction D2. Under the cooperation of the limiting convex 1726 and the slot 1763, the limiting member 120 can only pivot relative to the base 110 between the second position and the first position.Referring to FIG. 14 and FIG. 20, similar to the first embodiment, in the present embodiment, a limiting rib 1723 is also arranged on the outer circumferential surface of the rotating seat 172 to prevent the limiting member 120 from continuing to pivot in the second rotating direction D2 after being pivoted to the first position. The limiting rib 1723 cooperates with the second end 1763b of the slot 1763 to more effectively prevent the limiting member 120 from over-pivoting in the second rotating direction D2. FIG. 21 shows an adapter according to a third embodiment of the present disclosure, and FIG. 22 is a schematic view of fixing a portable carrier to a wheeled mobility device using the adapter shown in FIG. 21. The differences between the present embodiment and the second embodiment will be mainly described below, and the same or similar parts as the second embodiment will not be described again. As shown in FIG. 21, the first end and the second end of the strap 130 are connected to the first fastener 161 and the second fastener 162 of the buckle 160, respectively. The second fastener 162 is fixed to the limiting member 120, and a portion of the strap 130 extending to the second end is also fixed to the limiting member 120. The first end of the strap 130 connected to the first fastener 161 is a free end. Specifically, similar to the second embodiment, the side piece 122 of the limiting member 120 completely covers the limiting surface defined by the middle section 1211 of the limiting rod 121 and the cross rod 123, and the second fastener 162 is located at the lower part of the side piece 122. The strap 130 includes a first section and a second section connected to each other. The first section of the strap 130 extends from the connection position of the first section and the second section to the first end, and the second section of the strap 130 extends from the connection position of the first section and the second section to the second end. The second section of the strap 130 is fixed to the side piece 122, and the first section of the strap 130 is a free section, which is slightly longer than the second section. The second section of the strap 130 can be integrally or partially fixed to the side piece 122 by sewing, welding, or bonding. Referring to FIG. 22, after the adapter 10 is installed to the wheeled mobility device 20, the portable carrier 30 can be positioned on the adapter 10. The side surface of the portable carrier 30 is provided with a fixing band 320, and a passage is formed between the inner side of the fixing band 320 and the side surface of the portable carrier 30 for at least a portion of the limiting member 120 to pass through. When the portable carrier 30 is positioned on the adapter 10, at least a portion of the limiting member 120 passes through the passage between the inner side of the fixing band 320 and the side surface of the portable carrier 30. The first end of the strap 130 connected to the first fastener 161 is adapted to bypass the fixing band 320, so that when the first fastener 161 and the second fastener 162 are engaged, the fixing band 320 is fixed to the limiting member 120 by being wrapped by the strap 130.Specifically, the first fastener 161 engages with the second fastener 162 arranged on the side panel 122 around the outer side of the fixing band 320, at this time, the second section of the belt 130 is located on the inner side of the fixing band 320, and the first section of the belt 130 is located on the outer side of the fixing band 320, thereby the belt 130 encircles the fixing band 320 and fixes the fixing band 320 to the limiting member 120 to limit the movement of the portable carrier 30 relative to the adapter rack 10, especially, limit the movement of the portable carrier 30 in the vertical direction relative to the adapter rack 10. It can be understood that, similar to the second embodiment, the adapter rack 10 can also be provided with a belt adjusting member for adjusting the effective length of the belt 130, and the belt can also be an elastic band. In the present embodiment, the belt 130 is only arranged on one side of the adapter rack 10, thus simplifying the arrangement of the belt 130 of the adapter rack 10 for fixing the portable carrier 30, and the operation of the belt 130 is also more simple. It can be understood that the base and fixing seat structure proposed in the present embodiment is also applicable to the adapter rack in the first embodiment or other similar embodiments. The fourth embodiment shown in FIGS. 23 and 24 illustrates an adapter rack according to a fourth embodiment of the present disclosure. The differences between the present embodiment and the third embodiment will be mainly described below, and the same or similar parts as the third embodiment will not be described here. As shown in FIGS. 23 and 24, the base 110 includes a first rod member 111 and a second rod member 112. The first rod member 111 is a one-piece rod member including a first clamping rod Hla and a first extension rod 111b in line. The second rod member 112 includes two separate second clamping rods 112a and a second extension rod 112b between the two second clamping rods 112a. In the present embodiment, the distance between the second extension rod 112b and the first rod member 111 in the first direction F1 (corresponding to the distance between the second extension rod 112b and the first extension rod 111b in the first direction F1) is greater than the distance between the second clamping rod 112a and the first rod member 111 in the first direction F1 (corresponding to the distance between the second clamping rod 112a and the first clamping rod 111a in the first direction F1). The second extension rod 112b is generally U-shaped, and the two second clamping rods 112a are respectively connected to the two sides of the second extension rod 112b at the two ends of the U-shaped second extension rod 112b. The base 110 further includes two connecting rods 113 connected between the first rod member 111 and the second rod member 112. The two ends of the second extension rod 112b are respectively connected to the two connecting rods 113. The second extension rod 112b and the two connecting rods 113 can be integrally formed, that is, the second extension rod 112b and the two connecting rods 113 can be composed of a one-piece U-shaped rod.In other embodiments, the second extension rod 112b can be connected to the two connecting rods 113 by welding. In other embodiments, the second extension rod 112b can be connected to the two connecting rods 113 by fasteners such as threaded fasteners, pin fasteners, rivet-like fasteners, etc. The second extension rod 112b includes a generally linear middle section and two connecting sections extending generally perpendicularly from both ends of the middle section. The two connecting sections are connected to the two connecting rods 113, respectively. The transition between the connecting sections and the middle section can have a curvature, and the connecting sections themselves can also have a curvature. The fastener 150 is disposed on the middle section of the second extension rod 112b. The two connecting sections of the second extension rod 112b are connected to one end of the two connecting rods 113, respectively, and the other end of the two connecting rods 113 is connected to the first rod member 111. The middle section of the second extension rod 112b is parallel to the first rod member 111. The two second clamping rods 112a are connected to the two connecting sections of the second extension rod 112b, respectively, on the outside of the second extension rod 112b. The two second clamping rods 112a are collinear with each other and parallel to the first rod member 111, and the two second clamping rods 112a are closer to the first rod member 111 relative to the middle section of the second extension rod 112b. In this embodiment, the two second clamping rods 112a can be connected to the second extension rod 112b by welding. In other embodiments, the two second clamping rods 112a can also be connected to the second extension rod 112b by fasteners such as threaded fasteners, pin fasteners, rivet-like fasteners, etc. The first clamping rod 111a of the first rod member 111 and the second clamping rod 112a of the second rod member 112 are adapted to be clamped by the locking member 222 of the adapter assembly 220 to fix the adapter 10 to the wheeled mobile device 20. Since the distance between the middle section of the second extension rod 112b and the first rod member 111 is greater than the distance between the line connecting the two second clamping rods 112a and the first rod member 111, the fastener 150 disposed on the middle section of the second extension rod 112b in this embodiment can be farther away from the first rod member 111 relative to the fastener 150 disposed on the second extension rod 112b collinear with the second clamping rod 112a in the third embodiment. It can be understood that the second rod member 112 can have other structures, and the first rod member 111 can also have a similar structure to the second rod member 112 to achieve a distance between the second extension rod 112b and the first extension rod 111b in the first direction F1 greater than the distance between the second clamping rod 112a and the first clamping rod 111a in the first direction F1, i.e., the second extension rod 112b and the first extension rod 111b extend outward relative to the second clamping rod 112a and the first clamping rod 111a in the first direction F1.Similar to the first to third embodiments described above, the fixing member 150 is provided with a first positioning portion 152 adapted to cooperate with a positioning member 310 provided on the portable carrier 30 to guide the portable carrier 30 to be in a proper position relative to the base 110 during the process of mounting the portable carrier 30 to the base 110 of the adapter 10, and to prevent the portable carrier 30 from shaking relative to the adapter 10 in the first direction. More specifically, in the present embodiment, the positioning member 310 is provided on the bottom of the portable carrier 30, i.e., the first positioning portion 152 is adapted to cooperate with the positioning member 310 provided on the bottom of the portable carrier 30. In the third embodiment, the first rod member 111 is fixed to the fixing seat 171, and the connecting segment 1212 of the limiting rod 121 is fixed to the rotating seat 172 rotatably connected to the fixing seat 171, and the connecting segment 1212 is generally above the first rod member 111. In the present embodiment, the first rod member 111 and the connecting segment 1212 are fixed to the fixing seat 171 and the rotating seat 172 in a similar manner, respectively, the lower part of the fixing seat 171 is fixed to the base 110, i.e., the end of the first rod member 111, and the rotating seat 172 is rotatably connected to the upper part of the fixing seat 171. The difference between the present embodiment and the third embodiment is that the upper part of the fixing seat 171 is inclined toward the direction away from the base 110 (i.e., the upper part of the fixing seat 171 is inclined toward the direction away from the second rod member 112 along the first direction F1), so that in the first direction F1 as shown in FIG. 24, the connecting segment 1212 is farther away from the fixing member 150 than the first rod member 111, more specifically, the limiting member 120 is located on one of the two sides of the base 110 along the first direction F1, the lower part of the fixing seat 171 is fixed to the base 110 and is on the same side of the limiting member 120 on the base 110, and the upper part of the fixing seat 171 is inclined toward the direction away from the other side of the base 110 along the first direction F1 (i.e., the upper part of the fixing seat 171 is inclined toward the direction away from the second clamping rod 112a). Thus, compared with the third embodiment, in the present embodiment, the distance between the limiting member 120 and the fixing member 150 is larger. In the present embodiment, as shown in FIG. 24, the fixing seat 171 is provided with a second positioning portion 1719 adapted to cooperate with a positioning portion (for example, the positioning portion can be the side edge of the bottom of the portable carrier 30) of the portable carrier 30 to further prevent the portable carrier 30 from shaking relative to the adapter 10 in the first direction F1. In the present embodiment, the second positioning portion 1719 is a groove-shaped structure, and the second positioning portion 1719 can also be referred to as a second positioning groove.In other embodiments, the second positioning portion 1719 can also be a protruding structure, a ring structure, or a hook structure, etc. It can be understood that the second positioning portion 1719 can also be configured to cooperate with other positioning portions provided on the portable carrier 30. According to the adapter 10 of the present embodiment, the distance between the clamping rods that can be clamped by the clamping rod assembly 220 of the wheeled mobile device 20 (i.e., the distance between the first clamping rod 111a and the second clamping rod 112a) remains unchanged, while the distance between the limiting member 120 and the fixing member 150 is increased, thus, the fixing space of the adapter 10 is expanded, and the adapter 10 of the present embodiment can fix a larger size portable carrier 30o. It can be understood that the base and fixing seat structure proposed in the present embodiment is also applicable to the adapters in the first embodiment and the second embodiment or other similar embodiments. FIG. 25 shows an adapter according to a fifth embodiment of the present disclosure, and FIG. 26 is a schematic view of fixing a portable carrier on a wheeled mobile device by using the adapter shown in FIG. 25. In the following, the differences between the present embodiment and the fourth embodiment will be mainly described, and the same or similar parts as the fourth embodiment will not be described herein again. As shown in FIG. 25, in the present embodiment, the combination of the strap 130 and the buckle 160 is replaced by a fixing hook 140 as a fixing device for fixing the portable carrier 30 on the adapter 10. The fixing hook 140 is provided on the side piece 122 and is adapted to engage with a fixing strap 320 provided on the side of the portable carrier 30. Specifically, the fixing hook 140 is provided on the side of the side piece 122 facing away from the portable carrier 30, is located at the upper portion of the side piece 122, and has a hook portion bent downward. As shown in FIG. 26, after at least a portion of the limiting member 120 (i.e., the portion of the limiting member 120 above the fixing hook 140 in general) passes through the passage formed between the inner side of the fixing strap 320 and the side of the portable carrier 30 and extends out, the fixing hook 140 is adapted to hook the upper edge of the fixing strap 320 to limit the movement of the portable carrier 30 relative to the adapter 10, in particular, to limit the movement of the portable carrier 30 in the vertical direction relative to the adapter 10. When it is needed to remove the portable carrier 30 from the adapter 10, the user can first pull the upper edge of the fixing strap 320 downward and outward, so that the upper edge of the fixing strap 320 is disengaged from the fixing hook 140, and then lift the portable carrier 30 upward, so that the portable carrier 30 is separated from the adapter 10. In the present embodiment, the combination of the strap 130 and the buckle 160 is replaced by the fixing hook 140, thus, the structure of the fixing device of the adapter 10 for fixing the portable carrier 30 is simplified, the cost is reduced, and the operation is also simpler.In some other embodiments, the fixing hook 140 can be arranged to hook the lower edge of the fixing band 320, or the fixing band 320 can be provided with a through hole, and the fixing hook 140 can hook the edge of the through hole after passing through the through hole. It can be understood that the fixing hook in this embodiment is also applicable to the adapter frame in the first embodiment to the third embodiment or other similar embodiments, or is used in cooperation with the base, the rotary joint, etc. in these embodiments. Figs. 27 to 33 show an adapter frame according to a sixth embodiment of the present disclosure. In the following, the differences between this embodiment and the fourth embodiment or the fifth embodiment will be mainly described, and the same or similar parts of the fourth embodiment or the fifth embodiment will not be described herein again. On the one hand, as shown in Fig. 32, compared with the fifth embodiment described above, the fixing hook 140 can not be arranged, and the portable carrier 30 can be fixed to the adapter frame 10 only by cooperation (for example, elastic cooperation, interference cooperation, etc.) of the fixing band 320 and the limiting member 120. For example, the fixing band 320 can be made of an elastic material such as elastic fabric, and the elastic stretching of the fixing band 320 allows at least a part of the limiting member 120 to pass between the inner side of the fixing band 320 and the side of the portable carrier 30, and the elastic contraction of the fixing band 320 can clamp the limiting member 120 between the inner side of the fixing band 320 and the side of the portable carrier 30. In particular, compared with the position of the fixing band 320 shown in Fig. 26, the fixing band 320 can be arranged closer to the bottom of the portable carrier 30, so that the limiting member 120 is not easy to be pulled out of the fixing band 320, and therefore, the portable carrier 30 can be more stably connected to the adapter frame 10. On the other hand, as shown in Figs. 27 to 30, the base 110 is further provided with at least one supporting block 180. When the limiting member 120 is in the first position, the at least one supporting block 180 and the limiting member 120 are arranged in the first direction F1. When the portable carrier 30 is placed on the base 110, the at least one supporting block 180 is adapted to abut against the bottom of the portable carrier 30. More specifically, the at least one supporting block 180 is arranged at the other end of the base 110 opposite to the end where the limiting member 120 is pivoted. Specifically, in this embodiment, two supporting blocks 180 are arranged. The two supporting blocks 180 are respectively located on the opposite sides of the base 110 along a second direction F2 perpendicular to the first direction F1, and the further support of the bottom of the portable carrier 30 by the two supporting blocks 180 can further reduce the shaking of the portable carrier 30.As described in the foregoing embodiments, the base 110 includes the first rod member 111 and the second rod member 112 arranged at intervals in the first direction F1, the limiting member 120 is pivotably connected to the first rod member 111, and the fixing member 150 is provided to the second extension rod 112b of the second rod member 112. The two support blocks 180 are arranged on opposite sides of the fixing member 150 in the second direction F2 perpendicular to the first direction F1 and are close to the second extension rod 112b in the first direction F1. When the adapter bracket 10 is installed to the wheeled mobile device 20 as shown in FIG. 28, the first direction F1 corresponds to the left-right direction, i.e., the lateral direction of the wheeled mobile device, and the second direction F2 corresponds to the front-rear direction, i.e., the longitudinal direction of the wheeled mobile device. It can be understood that in some other embodiments, the adapter bracket 10 can also be installed to the wheeled mobile device 20 in a manner that the limiting member 120 is located on the front side or the rear side of the portable carrier 30, in which case, the first direction F1 corresponds to the front-rear direction, i.e., the longitudinal direction of the wheeled mobile device, and the second direction F2 corresponds to the left-right direction, i.e., the lateral direction of the wheeled mobile device. When the portable carrier 30 is placed on the base 110, the two support blocks 180 are adapted to abut against the bottom of the portable carrier 30 at positions close to the right side edge or the left side edge of the bottom of the portable carrier 30. For example, referring to FIG. 28, in the case that the limiting member 120 is connected to the left side of the base 110, the two support blocks 180 are adapted to abut against the bottom of the portable carrier 30 at positions close to the right side edge of the bottom of the portable carrier 30. Also for example, in the case that the limiting member 120 is connected to the right side of the base 110, the two support blocks 180 are adapted to abut against the bottom of the portable carrier 30 at positions close to the left side edge of the bottom of the portable carrier 30. Further, referring to FIG. 28 and FIG. 30, the two support blocks 180 abut against the front portion and the rear portion of the bottom of the portable carrier 30, respectively, that is, one of the support blocks 180 is close to the front side edge of the bottom of the portable carrier 30, and the other support block 180 is close to the rear side edge of the bottom of the portable carrier 30. In some other embodiments, only one support block 180 can be provided, or more than three support blocks 180 can be provided. In the case that only one support block 180 is provided, the support block 180 is located on one of the opposite sides of the fixing member 150 in the second direction F2. In the case that more than three support blocks 180 are provided, a part of the support blocks 180 are located on one of the opposite sides of the fixing member 150 in the second direction F2, and the other part of the support blocks 180 are located on the other of the opposite sides of the fixing member 150 in the second direction F2.By arranging at least one support block 180 on the base 110, the portable carrier 30 can be prevented from shaking relative to the adapter stand 10 in the second direction F2, so that the portable carrier 30 can be more stably connected to the adapter stand 10. Referring to FIG. 29, the support block 180 is arranged on the extension rod 114 of the base 10. In particular, two support blocks 180 are arranged on two extension rods 114, respectively, at least a portion of the two extension rods 114 extending in the second direction F2 on opposite sides of the second extension rod 112b. In an embodiment of the present disclosure, the extension rod 114 is connected to the second clamping rod 112a, as shown in FIGS. 27 and 29. It can be understood that, in other embodiments of the present disclosure, the extension rod 114 can be connected to other components of the base 10, such as the connecting rod 113 or the fixing member 150. In the case where the extension rod 114 is connected to the second clamping rod 112a, the extension rod 114 can be integrally formed with the second clamping rod 112a, that is, the extension rod 114 can be a rod portion extending outward from the second clamping rod 112a in the second direction F2. The extension rod 114 can also be connected to the second clamping rod 112a or other components by welding, or by screwing, clamping, or other connection methods. It can be understood that, in some other embodiments, the support block 180 can be directly connected to the fixing member 150, in particular, the support block 180 can be integrally formed with the fixing member 150, in which case the support block 180 extends from the fixing member 150 in the second direction F2. Referring to FIG. 29, the extension rod 114 includes a bent section 1141 and a mounting section 1142. The support block 180 is mounted on the mounting section 1142. The first end of the bent section 1141 is connected to the mounting section 1142, and the second end of the bent section 1141 is connected to the second clamping rod 112a or other components of the base 110. The first end of the bent section 1141 is bent upward relative to the second end, so that the position of the mounting section 1142 connected to the first end in the vertical direction is raised. In this way, the support block 180 does not need to have a too high height to abut against the bottom of the portable carrier 30. The degree to which the first end of the bent section 1141 is bent upward relative to the second end can be set according to the height of the support block 180. When the height of the support block 180 is higher, the degree to which the first end of the bent section 1141 is bent upward relative to the second end is lower, and when the height of the support block 180 is lower, the degree to which the first end of the bent section 1141 is bent upward relative to the second end is higher.In particular, in the case where the second positioning portion 1719 that cooperates with the side of the bottom of the portable carrier 30 is provided at the rotary joint 170, the contact point of the support block 180 with the bottom of the portable carrier 30 and the contact point of the second positioning portion 1719 with the bottom of the portable carrier 30 are located at the same horizontal plane. The following will describe an example embodiment of mounting the support block 180 to the mounting section 1142 with reference to FIGS. 29 and 31 to 33, and it will be understood that any other suitable embodiment can be employed to mount the support block 180 to the mounting section 1142, which will not be described here. The mounting section 1142 is provided with a limiting hole 1151 and a fastening hole 1152, and the support block 180 is provided with a limiting column 181 and a mounting hole 182. When the support block 180 is mounted to the mounting section 1142, the limiting column 181 is inserted into the limiting hole 1151 to prevent displacement of the support block 180 relative to the mounting section 1142. A fastener (not shown) is adapted to pass through the mounting hole 182 to connect with the fastening hole 1152. The fastener can be connected with the fastening hole 1152 by screwing, buckling or the like. The support block 180 can be fixed to the mounting section 1142 by connecting the fastener with the fastening hole 1152 via the mounting hole 182. In some embodiments, the extension rod 114 is a hollow pipe. In this case, the end of the support block 180 also has a shielding portion extending downward, which shields the end opening of the extension rod 114 when the support block 180 is mounted to the extension rod 114. It will be understood that the structure of the support block 180 proposed in the present embodiment is also applicable to the adapter frame in the first embodiment to the fifth embodiment or other similar embodiments described above. The technical features of the above embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the first embodiment are described, but as long as the combinations of the technical features do not contradict each other, they should be considered as falling within the scope of the present disclosure. The above embodiments only express several embodiments of the present disclosure, which are described in a specific and detailed manner, but should not be construed as limiting the scope of the patent. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present disclosure, which are all within the scope of the present disclosure. Therefore, the scope of protection of the present disclosure should be subject to the appended claims.

Claims

CLAIM 1. An adapter frame for connecting a portable carrier to a wheeled mobility device, the adapter frame comprising: a base adapted to be detachably mounted to the wheeled mobile device; and a limiting member movably connected to the base; wherein the limiting member has a first position and a second position relative to the base, such that the adapter frame is switchable between an unfolded state and a folded state; wherein when the limiting member is in the first position, the adapter frame is in the unfolded state, and the limiting member is used to limit movement of the portable carrier relative to the base.

2. The adapter frame of claim 1, wherein The limiting member is used to limit movement of the portable carrier relative to the base in a direction towards the limiting member.

3. The adapter rack of claim 1, wherein, The adapter frame further comprises a fixing device connected to the limiting member and adapted to connect the portable carrier to the adapter frame.

4. The adapter frame of claim 1, wherein The adapter frame is configured such that when the adapter frame is mounted to the wheeled mobile device, the wheeled mobile device can be folded when the adapter frame is in the folded state.

5. The adapter of claim 1, wherein: The base is provided with a fixing member provided with a first positioning portion adapted to cooperate with a positioning member provided on the portable carrier, the fixing member being arranged at an edge of the base opposite to an end of the base connected to the limiting member. ​ 6. The adapter frame of claim 1, wherein, The base comprises a first rod member and a second rod member arranged in a first direction, and a connecting rod connected between the first rod member and the second rod member, the first rod member and the second rod member being adapted to be detachably mounted to the wheeled mobile device, the limiting member and the first rod member being located on the same side of the adapter frame in the first direction when the limiting member is in the first position.

7. The adapter frame of claim 6, wherein: The first rod member comprises a first clamping rod and a first extension rod connected to the first clamping rod; the second rod member comprises a second clamping rod and a second extension rod connected to the second clamping rod; the first extension rod and the second extension rod are arranged in the first direction; the distance between the first extension rod and the second extension rod in the first direction is greater than or equal to the distance between the first clamping rod and the second clamping rod in the first direction.

8. The adapter of claim 1, wherein The limiting member is pivotally connected to the base, the adapter frame further comprises a rotary joint, the rotary joint comprises a fixed seat and a rotary seat rotatable relative to the fixed seat, the fixed seat is fixed to the base, and the rotary seat is fixed to the limiting member.

9. The adapter of claim 8, wherein, The rotary joint further comprises: a locking member slidably disposed between the fixed seat and the rotary seat relative to the rotary seat, and configured to be movable between a locked position and an unlocked position, wherein when the locking member is in the locked position, the limiting member is restricted from pivoting from the first position to the second position, and when the locking member is in the unlocked position, the limiting member is allowed to pivot from the first position to the second position; a resilient member configured to bias the locking member towards the locked position; and an unlocking button configured to be operable to drive the locking member to move from the locked position to the unlocked position.

10. The adapter frame of claim 8, wherein, The limiting member is connected to one of the two sides of the base along the first direction, the lower part of the fixed seat is fixed to the base and is located on the same side of the base as the limiting member, the upper part of the fixed seat is inclined towards the other side of the base along the first direction away from the base, and the rotary seat is rotatably connected to the upper part of the fixed seat.

11. The adapter of claim 3, wherein: The fixing device comprises a strap, a first fastener, and a second fastener configured to detachably engage with the first fastener; one end of the strap is connected to the base, the other end of the strap is connected to the first fastener; and the second fastener is disposed on the limiting member.

12. The adapter frame of claim 3, wherein, The fixing device comprises: a strap, a first fastener connected to a first end of the strap, and a second fastener connected to a second end of the strap and configured to detachably engage with the first fastener; wherein the strap comprises a first segment extending to the first end, and a second segment extending from the first segment to the second end; wherein the second segment of the strap and the second fastener are fixed to the limiting member, and the first segment of the strap is a free segment.

13. The adapter frame according to claim 3, characterized in that, The fixing device comprises a fixing hook disposed on the limiting member and adapted to engage a fixing strap disposed on the side of the portable carrier.

14. The adapter of claim 1, wherein: The base is further provided with at least one support block, the at least one support block and the limiting member are spaced apart along the first direction when the limiting member is in the first position, and the at least one support block is adapted to abut against the bottom of the portable carrier. ​ 15. A wheeled mobility device comprising: A frame; a socket assembly mounted on the frame; and the adapter according to any one of claims 1 to 14, which is detachably connected to the socket assembly; wherein the adapter is configured such that when the adapter is in the folded state, the adapter is generally flat, and the wheeled mobility device can be folded; and wherein during folding of the wheeled mobility device, folding of the frame drives the adapter in the folded state to rotate.

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