Carrier

Abstract

The utility model discloses a carrier which comprises a bearing body and two sets of wheel assemblies arranged at the bottom of the bearing body, the two sets of wheel assemblies are arranged at intervals in the front-back direction, and the position of at least one set of wheel assembly on the bearing body is adjustably arranged in the front-back direction. The state of the carrier can be changed through the adjusting wheel assembly, so that the carrier can be suitable for different scenes, the function of the carrier is fully played, and convenience is brought to a user.

Description

Technical Field

[0001] The utility model relates to a carrier. Background Art

[0002] Most existing vehicles, such as carts and trailers, have a fixed structure and only have one working state. This allows the vehicle to fully exert its functions in specific usage scenarios and bring convenience to users. However, when the usage scenario changes, the vehicle cannot adapt well to the changed scenario, making the vehicle inconvenient to use and causing inconvenience to users. Utility Model Content

[0003] The purpose of the utility model is to provide a carrier.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a carrier, which includes a carrying body and two sets of wheel assemblies arranged at the bottom of the carrying body, the two sets of wheel assemblies are arranged at intervals along the front-to-back direction, and the position of at least one set of wheel assemblies on the carrying body can be adjusted along the front-to-back direction.

[0005] In some embodiments, the carrier also includes an adapter, which has an adapter portion and a mounting portion arranged at intervals, and the adapter portion can be rotatably connected to the carrying body around a rotation center line, and the wheel assembly is connected to the mounting portion. When the adapter swings around the rotation center line, the mounting portion changes position in the front-to-back direction, wherein the wheel assembly has a wheel axle, and the axis of the wheel axle is parallel to the rotation center line. When the angle between the adapter and the horizontal plane changes, the distance between the rotation center line and the axis of the wheel axle in the front-to-back direction changes.

[0006] In some embodiments, the wheel assembly has a first position and a second position. When the wheel assembly is in the first position and in the second position, the centerline of the wheel axle is at the same height, and when the adapter swings back and forth around the rotation centerline, it drives the wheel assembly to switch between the first position and the second position.

[0007] In some embodiments, the adapter is detachably connected to the supporting body via a locking member, the locking member is a bolt, and the axis of the bolt extends colinearly with the rotation centerline.

[0008] In some embodiments, the adapter has two adapter rods spaced apart in the left-right direction, one end of each of the two adapter rods is detachably connected to the supporting body through a locking member, and the axle is rotatably connected to the other end of the two adapter rods around its own axis, the locking member is a bolt, and the axis of the bolt extends colinearly with the rotation center line.

[0009] In some embodiments, the carrier further includes a mounting seat, which is fixedly disposed on the carrying body, and the wheel assembly is slidably connected to the mounting seat along the front-rear direction.

[0010] In some embodiments, the mounting seat includes two sliding rods spaced apart in the left-right direction, the sliding rods extending in the front-to-back direction, the wheel assembly includes an axle, and the axle can be slidably connected to the sliding rod along the length extension direction of the sliding rod, wherein the sliding rod on each side is provided with a sliding groove extending in the front-to-back direction, and the axle is slidably inserted in the sliding grooves on both sides.

[0011] In some embodiments, the sliding rod on each side is fixed with a front link and a rear link, and the front link and the rear link extend in the up and down directions and are fixed to the supporting body, wherein the distance between the first connection position where the front link is fixed on the supporting body and the second connection position where the rear link is fixed on the supporting body is less than the length of the sliding rod.

[0012] In some embodiments, a plurality of engaging structures are provided on the carrying body, and the plurality of engaging structures are distributed at intervals along the front-to-back direction, and the wheel assembly is detachably connected to the engaging structures.

[0013] In some embodiments, the carrying body has a base frame extending horizontally in the front-to-back direction, all the wheel assemblies are mounted on the base frame, and when the front-to-back position of the wheel assembly on the carrying body changes, the size of the carrying body in the front-to-back direction remains constant, and / or, the wheel assembly includes a wheel axle and a wheel body arranged on the wheel axle, the wheel axle is rotatably connected to the carrying body around its own axis, and the wheel axle is located below the carrying body in the vertical direction.

[0014] In some embodiments, the two groups of wheel assemblies are respectively a front wheel assembly and a rear wheel assembly, the front wheel assembly is located in front of the rear wheel assembly, the front wheel assembly is detachably connected to the carrying body or can be folded relative to the carrying body, and the position of the rear wheel assembly on the carrying body is adjustable along the front and rear directions.

[0015] Due to the application of the above-mentioned technical solution, the present invention has the following advantages compared with the prior art: the wheel assembly of the vehicle of the present invention can adjust the position. In different usage scenarios, the state of the vehicle can be adjusted by adjusting the wheel assembly, so that the vehicle can achieve a balance between load stability and turning flexibility, so that the vehicle can adapt to different scenarios and give full play to the role of the vehicle, bringing convenience to users. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attachment Figure 1 A schematic diagram of the three-dimensional structure of the carrier according to Example 1 of the present utility model;

[0017] Attachment Figure 2 For attachment Figure 1 A three-dimensional diagram after removing the tow bar;

[0018] Attachment Figure 3 For attachment Figure 2 Side view of

[0019] Attachment Figure 4 For attachment Figure 1 Schematic diagram after the rear wheel assembly is adjusted and the front wheel assembly is removed;

[0020] Attachment Figure 5 For attachment Figure 4 Side view of

[0021] Attachment Figure 6 For attachment Figure 5 Schematic diagram when the front wheel assembly is not removed;

[0022] Attachment Figure 7 is a schematic diagram of a carrier according to Example 2;

[0023] Attachment Figure 8 For attachment Figure 7 Schematic diagram after the rear wheel assembly is adjusted and the front wheel assembly is removed;

[0024] Attachment Figure 9 is a schematic diagram of the carrier of Example 3;

[0025] Attachment Figure 10 For attachment Figure 9 Schematic diagram after the rear wheel assembly is adjusted and the front wheel assembly is removed;

[0026] Attachment Figure 11 Schematic diagram of the three-dimensional structure of the carrier of Example 4;

[0027] Attachment Figure 12 For attachment Figure 11 Side view of

[0028] Attachment Figure 13 For attachment Figure 12 Schematic diagram after the front wheel assembly position is adjusted;

[0029] Among them: 1. load-bearing body; 11. chassis; 12. side frame; 121. front fence; 122. rear upper fence; 123. rear lower fence; 124. bottom support rod; 13. cross link; 2. push handle frame; 21. grip rod; 22. connecting rod; 30. axle; 31. front wheel assembly; 311. wheel frame; 32. rear wheel assembly; 4. traction rod; 5. adapter; 51. adapter rod; 511. adapter part; 512. mounting part; 6. locking part; 7. mounting seat; 71. slide rod; 72. slide groove; 73. front connecting rod; 74. rear connecting rod; 8. joint structure; 81. mounting hole; 82. mounting seat. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments to make the advantages and features of the present invention easier for those skilled in the art to understand. Obviously, the embodiments described in this application are only part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0031] Example 1

[0032] See also Figure 1 、 Figure 2 The illustrated vehicle comprises a carrier body 1 and two sets of wheel assemblies disposed at the bottom of the carrier body 1. The two sets of wheel assemblies are spaced apart in the fore-aft direction, and the position of at least one wheel assembly on the carrier body 1 is adjustable in the fore-aft direction. By adjusting the position of the wheel assembly on the carrier body 1, the state of the vehicle can be changed, and the distance between the two wheel assemblies can also be varied, thereby changing the characteristics and functions of the vehicle, making it suitable for different usage scenarios.

[0033] Specifically, the wheel assembly includes an axle 30 and a wheel body mounted on the axle 30. The axle 30 is rotatably connected to the load-bearing body 1 about its own axis. The position of the wheel assembly can be adjusted by adjusting the connection position of the axle 30 on the load-bearing body 1. In this embodiment, the axle 30 is vertically located below the load-bearing body 1. Specifically, the load-bearing body 1 includes a base frame 11, which extends horizontally in the front-to-back direction. All wheel assemblies are mounted on the base frame 11, and the axle 30 is disposed below the base frame 11. In this embodiment, when the wheel assembly changes its front-to-back position on the load-bearing body 1, the dimensions of the load-bearing body 1 in the front-to-back direction remain constant.

[0034] In this embodiment, the two wheel assemblies are a front wheel assembly 31 and a rear wheel assembly 32, and the front wheel assembly 31 is located in front of the rear wheel assembly 32. Figure 2As shown, the front wheel assembly 31 and the rear wheel assembly 32 are arranged at intervals along the front-to-back direction at the bottom of the chassis 11. By adjusting the position of the wheel assembly, the wheelbase between the front wheel assembly 31 and the rear wheel assembly 32 can be adjusted. When the wheelbase between the front wheel assembly 31 and the rear wheel assembly 32 is larger, the stability of the vehicle is better. At this time, if the vehicle is used as a cart for transporting goods, it can carry items of large mass or large volume; if the vehicle is used as a child stroller, it can carry two children. By adjusting the wheel assembly, the wheelbase between the front wheel assembly 31 and the rear wheel assembly 32 can be reduced. At this time, the vehicle has higher flexibility and is more flexible when turning. The above-mentioned wheelbase is the distance between the axle 30 of the front wheel assembly 31 and the axle 30 of the rear wheel assembly 32.

[0035] In this embodiment, the wheel assembly is detachably connected to the carrier body 1. Specifically, the carrier body 1 is provided with a plurality of engaging structures 8 that are detachably connected to the wheel assembly. The engaging structures 8 are spaced apart along the front-to-back direction, and the wheel assembly is detachably connected to the engaging structures 8. By connecting the wheel assembly to different engaging structures 8, the front-to-back position of the wheel assembly can be adjusted.

[0036] In this embodiment, the wheel assembly is detachably connected to the coupling structure 8 via the wheel axle 30. Specifically, the coupling structure 8 is provided with a mounting hole 81 for connecting to the wheel axle 30. The mounting hole 81 extends in the left-right direction. When the wheel axle 30 is inserted into the mounting hole 81, the wheel assembly is connected to the coupling structure 8. When the wheel axle 30 is removed from the mounting hole 81, the wheel assembly is removed from the coupling structure 8.

[0037] In this embodiment, the position of the rear wheel assembly 32 on the load-bearing body 1 is adjustable, and the rear wheel assembly 32 is detachably connected to the coupling structure 8. Specifically, the rear wheel assembly 32 comprises two sets of rear wheel assemblies spaced apart in the left-right direction. The coupling structure 8 is fixed to the base frame 11, and each coupling structure 8 includes two mounting seats 82, one on the left and one on the right side of the base frame 11. Mounting holes 81 are provided in the mounting seats 82, and the two mounting holes 81 of each coupling structure 8 extend in the same direction. When the rear wheel assembly 32 is mated with the coupling structure 8, the two wheel axles 30 of the two rear wheel assemblies 32 are respectively inserted into the two mounting holes 81 on the left and right sides of the same coupling structure 8.

[0038] In this embodiment, two engagement structures 8 are spaced apart at the bottom of the chassis 11 in the front-to-back direction, allowing the rear wheel assembly 32 to have two adjustable positions on the support body 1. In other embodiments, more than two engagement structures 8 may be provided on the support body 1, allowing the rear wheel assembly 32 to have a greater number of adjustable positions. In this embodiment, two mounting seats 82 of each engagement structure 8 extend outward from the left and right sides of the chassis 11. In the left-to-right direction, the chassis 11 is positioned between the two wheel bodies of the two sets of rear wheel assemblies 32.

[0039] In some embodiments, the front wheel assembly 31 is detachably connected to the load-bearing body 1 or can be folded relative to the load-bearing body 1. When the front wheel assembly 31 is removed from the load-bearing body 1, or when the front wheel assembly 31 and the load-bearing body 1 are folded relative to each other, only the rear wheel assembly 32 is supported on the ground. The vehicle in this state can be fixed on a bicycle or other movable vehicle and used as a trailer.

[0040] See also Figure 1 、 Figure 4 and Figure 5 As shown, in this embodiment, the carrier is provided with a tow bar 4, which is detachably or movably connected to the carrier body 1. The tow bar 4 allows the carrier to be fixed to other movable vehicles and moved by a bicycle or other movable vehicle. When the carrier is used alone, the tow bar 4 can be detached from the carrier body 1 or folded relative to the carrier body 1.

[0041] When the vehicle is fixed to other vehicles through the tow bar 4, see Figure 1 、 Figure 6 As shown, the front wheel assembly 31 and the rear wheel assembly 32 can be supported on the ground together to improve stability. Figure 4 As shown, the front wheel assembly 31 can also be removed from the load-bearing body 1 or the front wheel assembly 31 can be driven to be folded relative to the load-bearing body 1 to further improve the flexibility of the vehicle.

[0042] In some preferred embodiments, when the vehicle is used as a trailer, the rear wheel assembly 32 can be driven to move forward to reduce the wheelbase between the rear wheel assembly 32 and the wheels of the front vehicle, thereby improving the maneuverability of the vehicle.

[0043] In this embodiment, the chassis 11 has a horizontal load-bearing surface, and the wheel body of the rear wheel assembly 32 is at least partially higher than the load-bearing surface. The wheel body of the rear wheel assembly 32 is larger in size, thereby having better grip, especially when the vehicle is used as a trailer, it can better maintain the stability of the vehicle. At the same time, the larger wheel body has a longer service life and is more durable.

[0044] In this embodiment, the carrier body 1 further includes side frames 12 disposed on the base frame 11. The side frames 12 cooperate with the base frame 11 to form a storage space within which items can be placed or people can sit. Specifically, the side frames 12 include two sets, one on the left and one on the right side of the base frame 11. Each set of side frames 12 includes a front bar 121, a rear bar, and a bottom support bar 124. The front bar 121, rear bar, and bottom support bar 124 are connected end to end to form a closed frame. As shown in the figure, the bottom support bar 124 extends in a front-to-back direction. The front bar 121 extends upward and rearward from the front portion of the bottom support bar 124, forming an upwardly arched arc. The rear bar extends in a vertical direction and is connected between the upper portion of the front bar 121 and the rear portion of the bottom support bar 124. In this embodiment, the front portion of the bottom support bar 124 is bent upward to increase the height of the front side of the storage space, thereby increasing the volume of the storage space.

[0045] In this embodiment, the rear fence includes an interconnected upper fence 122 and a lower fence 123. The upper portion of the upper fence 122 is rotationally connected to the rear portion of the front fence 121, the lower portion of the upper fence 122 is rotationally connected to the upper portion of the lower fence 123, and the lower portion of the lower fence 123 is rotationally connected to the rear portion of the bottom support rod 124. The front fence 121, the upper fence 122, the lower fence 123, and the bottom support rod 124 form a four-bar linkage. By folding the upper fence 122 and the lower fence 123 relative to each other, the front fence 121 is driven to fold downward relative to the bottom support rod 124, thereby folding the side frames 12 together in the vertical direction. When the vehicle is not in use, folding the side frames 12 can reduce the size of the vehicle, making it easier to store the vehicle.

[0046] In this embodiment, the carrier body 1 further includes a horizontal connecting rod 13 extending in the left-right direction and connected between the two sets of side frames 12, which is used to maintain the stability between the two sets of side frames 12 and make the two side frames 12 become a whole. Specifically, there are multiple horizontal connecting rods 13, see Figure 1 As shown, one of the cross-links 13 connects the two bottom support bars 124 on both sides of the seat, and a locking mechanism is provided between the chassis 11 and the cross-link 13 to achieve a fixed connection between the side frame 12 and the chassis 11. When the locking mechanism is in the unlocked state, the side frame 12 can be removed from the chassis 11. A cross-link 13 is also connected between the upper parts of the two front fence bars 121 or between the upper parts of the two rear upper fence bars 122. In this embodiment, the vehicle also has a push handle frame 2, see Figure 1As shown, the handle frame 2 is rotatably connected to the horizontal connecting rod 13 about the axis of the horizontal connecting rod 13. The handle frame 2 is rotatably arranged so that the user can rotate the handle frame 2 to adjust the vehicle to a comfortable position. Therefore, when the vehicle is not in use, or in the second usage position when the vehicle is used as a trailer, the handle frame 2 can be rotated to fold relative to the side frame 12, thereby reducing the vehicle's volume.

[0047] Specifically, the push handle frame 2 is U-shaped and includes a gripping rod 21 extending in the left-right direction and two connecting rods 22 extending in the front-back direction. The two connecting rods 22 are spaced apart and arranged in parallel in the left-right direction. The gripping rod 21 is connected between the rear ends of the two connecting rods 22, and the front ends of the two connecting rods 22 are rotatably connected to the above-mentioned transverse connecting rod 13. In some preferred embodiments, the push handle frame 2 and the transverse connecting rod 13 are provided with a locking structure. After the push handle frame 2 is adjusted by rotation, the locking structure can be used to lock the push handle frame 2. When the push handle frame 2 needs to be adjusted again or needs to be folded, the locking structure needs to be released. In some preferred embodiments, the vehicle is provided with a brake device, and the push handle frame 2 is provided with a brake handle. The brake handle can be used to control the brake device to brake the vehicle.

[0048] Example 2

[0049] See also Figure 7 、 Figure 8 As shown, the main difference between this embodiment and Example 1 is that in this embodiment, the wheel assembly can swing forward and backward about a rotational centerline relative to the carrier body 1, thereby adjusting the position of the assembly on the carrier body 1. Specifically, the carrier further includes an adapter 5, which is rotatably connected to the carrier body 1 about the rotational centerline. The wheel assembly is also rotatably connected to the adapter 5. When the adapter 5 swings about the rotational centerline, the wheel assembly moves forward and backward relative to the carrier body 1.

[0050] In this embodiment, the adapter 5 includes a spaced-apart adapter portion 511 and a mounting portion 512. The adapter portion 511 is rotatably connected to the carrier body 1 about a rotational centerline. The wheel assembly is connected to the mounting portion 512. The adapter 5 swings about the rotational centerline, causing the mounting portion 512 to change its position in the fore-aft direction, thereby changing the position of the wheel assembly in the fore-aft direction. Specifically, the adapter 5 includes two adapter rods 51 spaced-apart in the left-right direction. One end of each adapter rod 51 is connected to the carrier body 1. The wheel axle 30 is rotatably connected to the other end of each adapter rod 51 about its own axis. The two ends of the adapter rods 51 constitute the aforementioned adapter portion 511 and mounting portion 512. In this embodiment, the rear wheel assembly 32 is connected to the mounting portion 512.

[0051] In this embodiment, the axis line of the axle 30 and the rotation center line are parallel to each other. Specifically, the axis line of the axle 30 and the rotation center line both extend in the left and right directions. When the angle between the adapter 5 and the horizontal plane changes, the distance between the rotation center line and the axis line of the axle 30 in the front-to-back direction changes.

[0052] In this embodiment, the wheel assembly has a first position and a second position, located in front of and behind the rotational centerline. The adapter 5 swings back and forth about the rotational centerline, driving the wheel assembly to transition between the first and second positions. In this embodiment, the centerline of the wheel axle 30 is at the same height when the wheel assembly is in the first and second positions. This arrangement ensures that the height of the wheel assembly remains unchanged before and after adjustment, thereby maintaining the height of the support body 1. In other embodiments, the centerline height of the wheel axle 30 may change between the first and second positions, thereby changing the height of the support body 1.

[0053] In this embodiment, the adapter 511 is removably connected to the carrier body 1 via a locking member 6. When the locking member 6 is locked, the adapter 5 is locked, and the position of the wheel assembly is also locked. Specifically, one end of each of the two adapter rods 51 is removably connected to the carrier body 1 via a locking member 6. In this embodiment, the locking member 6 is a bolt, and the axis of the bolt extends colinearly with the rotation centerline.

[0054] Example 3

[0055] See also Figure 9 、 Figure 10 As shown, the main difference between this embodiment and Example 1 is that in this embodiment, the carrier further includes a mounting base 7, which is fixedly disposed on the carrier body 1. The wheel assembly is slidably connected to the mounting base 7 in the front-to-back direction. By driving the wheel assembly to slide back and forth, the position of the wheel assembly on the carrier body 1 can be adjusted. Specifically, the mounting base 7 includes two sliding rods 71 ​​spaced apart in the left-right direction. The sliding rods 71 ​​extend in the front-to-back direction. The wheel axle 30 of the wheel assembly is slidably connected to the sliding rods 71 ​​along the length of the sliding rods 71.

[0056] In this embodiment, a slide groove 72 extending in the front-to-back direction is provided on each side of the slide bar 71, and the wheel axle 30 is slidably inserted into the slide groove 72 on both sides. Figure 9 As shown, the axle 30 of the rear wheel assembly 32 is slidably inserted into the slide groove 72 , and the rear wheel assembly 32 can slide back and forth along the slide groove 72 .

[0057] In this embodiment, a front link 73 and a rear link 74 are fixedly mounted on each side of the slide bar 71. The front link 73 and the rear link 74 both extend in the vertical direction. The front link 73 and the rear link 74 are respectively fixedly connected to the front and rear portions of the slide bar 71. The front link 73 and the rear link 74 are also fixedly connected to the carrier body 1. In some preferred embodiments, the distance between the first connection point where the front link 73 is fixed to the carrier body 1 and the second connection point where the rear link 74 is fixed to the carrier body 1 is less than the length of the slide bar 71, thereby increasing the distance that the wheel assembly can move in the front-to-back direction.

[0058] Example 4

[0059] See also Figures 11 to 13 As shown, the main difference between this embodiment and embodiment 1 is that in this embodiment, the position of the front wheel assembly 31 on the carrier body 1 is adjustable along the front-to-back direction. In this embodiment, the front wheel assembly 31 is a universal wheel having a wheel frame 311 rotatably mounted on the carrier body 1 about a rotation centerline extending in the vertical direction. The wheel body of the front wheel assembly 31 is rotatably connected to the wheel frame 311 about a wheel axle 30.

[0060] In this embodiment, the wheel frame 311 is detachably connected to the base frame 11. The base frame 11 is provided with multiple mounting structures for the wheel frame 311 to connect to. The multiple mounting structures are spaced apart in the front-to-back direction. By connecting the wheel frame 311 to different mounting structures, the position of the front wheel assembly 31 can be adjusted. Alternatively, the wheel frame can be slidably mounted relative to the base frame 11 in the front-to-back direction, and the position of the front wheel assembly 31 can be adjusted by sliding back and forth. Alternatively, the wheel frame can be mounted on the base frame 11 so that it can swing back and forth.

[0061] Example 5

[0062] Although not shown in the figure, in this embodiment, the position of the front wheel assembly 31 on the carrier body 1 is adjustable along the front-to-back direction, and the position of the front wheel assembly 31 can be adjusted between the front wheel assembly 31 and the carrier body 1 by using the arrangement methods of Embodiments 1, 2 and 3.

[0063] In summary, the vehicles of all the above embodiments can adjust the positions of the wheel assemblies, including the front wheel assembly 31 and the rear wheel assembly 32, thereby adjusting the stability, flexibility and other characteristics of the vehicles, so that the vehicles can strike a balance between load-bearing stability and conversion flexibility, thereby being suitable for different scenarios and being able to convert between cart mode and trailer mode. The vehicles can give full play to their role and bring convenience to users.

[0064] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention are intended to be included in the scope of protection of the present invention.

Claims

1. A vehicle, characterized in that: The carrier includes a carrying body and two sets of wheel assemblies arranged at the bottom of the carrying body. The two sets of wheel assemblies are arranged at intervals along the front-to-back direction, and the position of at least one set of wheel assemblies on the carrying body is adjustable along the front-to-back direction.

2. The carrier according to claim 1, characterized in that: The carrier further includes an adapter, the adapter having an adapter portion and a mounting portion that are spaced apart. The adapter portion is rotatably connected to the carrier body around a rotation centerline. The wheel assembly is connected to the mounting portion. When the adapter swings around the rotation centerline, the mounting portion changes position in a front-to-rear direction. In which, the wheel assembly has a wheel axle, the axis line of the wheel axle is parallel to the rotation center line, and when the angle between the adapter and the horizontal plane changes, the distance between the rotation center line and the axis line of the wheel axle in the front-to-back direction changes.

3. The carrier according to claim 2, characterized in that: The wheel assembly has a first position and a second position. When the wheel assembly is in the first position and in the second position, the center line of the wheel axle is at the same height. When the adapter swings back and forth around the rotation center line, it drives the wheel assembly to switch between the first position and the second position.

4. The carrier according to claim 2, characterized in that: The adapter is detachably connected to the carrier body via a locking member, wherein the locking member is a bolt, and the axis of the bolt extends colinearly with the rotation centerline; Alternatively, the adapter has two adapter rods arranged at intervals in the left-right direction, one end of each of the two adapter rods is detachably connected to the supporting body through a locking member, and the wheel axle is rotatably connected to the other end of the two adapter rods around its own axis, and the locking member is a bolt, and the axis of the bolt extends colinearly with the rotation centerline.

5. The carrier according to claim 1, characterized in that: The carrier further includes a mounting seat, which is fixedly arranged on the carrying body, and the wheel assembly is slidably connected to the mounting seat along the front-rear direction.

6. The carrier according to claim 5, characterized in that: The mounting seat includes two sliding rods spaced apart in the left-right direction, the sliding rods extending in the front-back direction, and the wheel assembly includes a wheel axle, which can be slidably connected to the sliding rods along the length extension direction of the sliding rods. Wherein, the sliding rod on each side is provided with a sliding groove extending in the front-to-back direction, and the wheel axle is slidably inserted into the sliding groove on both sides.

7. The carrier according to claim 6, characterized in that: The sliding rod on each side is fixed with a front link and a rear link, and the front link and the rear link extend in the up-down direction and are fixed to the carrying body, wherein the distance between the first connection position where the front link is fixed on the carrying body and the second connection position where the rear link is fixed on the carrying body is less than the length of the sliding rod.

8. The carrier according to claim 1, characterized in that: The carrying body is provided with a plurality of coupling structures, which are distributed at intervals along the front-to-back direction, and the wheel assembly is detachably connected to the coupling structures.

9. The carrier according to claim 1, characterized in that: The load-bearing body has a chassis extending horizontally in the front-to-back direction, all the wheel assemblies are mounted on the chassis, and when the front-to-back position of the wheel assemblies on the load-bearing body changes, the size of the load-bearing body in the front-to-back direction remains constant, and / or, The wheel assembly includes a wheel axle and a wheel body arranged on the wheel axle. The wheel axle is rotatably connected to the bearing body around its own axis, and the wheel axle is located below the bearing body in the vertical direction.

10. The carrier according to any one of claims 1 to 9, characterized in that: The two groups of wheel assemblies are respectively a front wheel assembly and a rear wheel assembly. The front wheel assembly is located in front of the rear wheel assembly. The front wheel assembly is detachably connected to the carrying body or can be folded relative to the carrying body. The position of the rear wheel assembly on the carrying body is adjustable along the front and rear directions.

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