A transfer vehicle that facilitates easy unloading.

Abstract

This utility model relates to the field of transfer vehicle technology, specifically to a transfer vehicle with convenient unloading, comprising: a rolling frame assembly and a transport container. The rolling frame assembly includes two symmetrically arranged U-shaped chutes; it also includes a rolling support frame assembly, on both sides of which are respectively connected two rollers located in corresponding U-shaped chutes, the rollers being rolled to the inner walls of the U-shaped chutes; at least two hinge components are connected at intervals to one end of the rolling support frame assembly, the hinge components being connected to the bottom of the transport container; and it also includes a limiting component to prevent relative movement between the transport container and the rolling frame assembly. This utility model has a reasonable structure, reduces the labor intensity of workers, and improves the convenience of unloading.

Description

Technical Field

[0001] This utility model relates to the field of transfer vehicle technology, and in particular to a transfer vehicle that facilitates unloading. Background Technology

[0002] In agricultural production, agricultural transport vehicles are key equipment for transporting grain and other materials. For medium and large-sized transport vehicles that need to carry more than 300KG of goods, in order to avoid the goods being stacked too high due to the small placement area of ​​the truck bed (too high a stack will raise the vehicle's center of gravity and significantly reduce driving stability), the truck bed is usually designed to be longer. By increasing the flat area, the height of the goods can be kept relatively small, thus ensuring transportation safety.

[0003] However, once the transfer vehicle has transported the goods to its destination, manually unloading them one by one is extremely inefficient. Therefore, in practice, users often choose a faster method: first, open the door at one end of the carriage, then lift the corresponding end of the transfer vehicle, causing the carriage to tilt downwards, allowing gravity to automatically slide the goods to the ground, thus improving unloading efficiency. However, because the goods are laid flat inside the long carriage, their center of gravity is concentrated in the middle area of ​​the transfer vehicle, requiring users to exert tremendous force to lift and tilt the entire vehicle, ensuring the opened door side is in an inclined unloading position. This method not only significantly increases the labor intensity of workers but also reduces the convenience of unloading operations. Utility Model Content

[0004] The main technical problem solved by this utility model is to provide a transfer vehicle that facilitates unloading, thereby reducing the labor intensity of workers and improving the convenience of unloading.

[0005] To solve the above-mentioned technical problems, the present invention adopts a technical solution as follows: providing a transfer vehicle with convenient unloading, comprising: a rolling frame assembly and a transport box, wherein the rolling frame assembly includes two symmetrically arranged U-shaped chutes;

[0006] It also includes a rolling support frame assembly, wherein two rollers located in corresponding U-shaped grooves are connected at intervals on both sides of the rolling support frame assembly, and the rollers are in rolling connection with the inner wall of the U-shaped groove;

[0007] One end of the rolling support frame assembly is connected with at least two hinge components at intervals, and the hinge components are connected to the bottom of the transport box.

[0008] It also includes a limiting component to prevent relative movement between the transport bin and the rolling frame assembly.

[0009] By adopting the above technical solution, the goods are first laid flat in the transport container, and some goods can be stacked as needed. After the user pushes the transfer vehicle to the designated placement area, they first operate the limiting component to release the locking state between the transport container and the rolling frame assembly. Since the transport container is connected to the rolling support frame assembly via a hinge assembly, and the rollers on the rolling support frame assembly can roll flexibly within the U-shaped groove of the rolling frame assembly, the user only needs to apply a small force to push the transport container to one end of the rolling frame assembly. After the transport container is in place, the user opens the door at one end and then applies a suitable amount of force to flip the transport container, so that the door is tilted downwards in an unloading posture. In this state, the goods inside the transport container will quickly slide to the ground under gravity, efficiently completing the unloading operation. The entire process does not require the user to apply a large amount of force to flip the entire transfer vehicle, greatly reducing labor intensity and significantly improving operational convenience.

[0010] In a preferred embodiment, the present invention can be further configured such that: the rolling support frame assembly further includes two support shafts, a U-shaped plate is connected between the two support shafts, and roller bodies are respectively fitted to both ends of the support shafts, with the roller bodies located in corresponding U-shaped grooves.

[0011] By adopting the above technical solution, the two support shafts are indirectly fixed to form an integral structure through a U-shaped plate, and the rollers at both ends of the support shafts can roll flexibly in the U-shaped groove, reducing the resistance encountered by the movement of the rolling support frame assembly.

[0012] In a preferred embodiment, the present invention can be further configured as follows: the rolling frame assembly further includes a frame body, two U-shaped steels are symmetrically connected on the frame body, the U-shaped steels are provided with the U-shaped grooves, two rotary mounting seats are connected at intervals at one end of the frame body, and rollers are respectively connected in the rotary mounting seats; two U-shaped fixing seats are connected at intervals at the other end of the frame body, and rollers are respectively connected in the U-shaped fixing seats.

[0013] A handrail is connected to one end of the vehicle frame near the first roller;

[0014] The rotary mounting base includes a sleeve connected to the vehicle frame and a fixed shaft rotatably connected to its inner hole. The lower end of the fixed shaft is connected to a U-shaped mounting base, and the roller is installed inside the U-shaped mounting base.

[0015] It also includes brake components for braking the rollers.

[0016] By adopting the above technical solution, with the synergistic effect of roller one and roller two, the user only needs to hold the handrail and apply pushing force to easily drive the transfer vehicle forward, meeting the basic movement requirements for cargo transfer. Because the fixed shaft and the inner hole of the sleeve adopt a rotating connection structure, when the user applies a steering force to the side of the handrail, the fixed shaft can rotate flexibly within the sleeve, thereby changing the rolling direction of roller one and enabling convenient adjustment of the transfer vehicle's travel direction to adapt to path changes in different operating scenarios. When encountering emergencies such as pedestrians crossing or obstacles blocking the way, requiring immediate stopping, the user can operate the brake. Through the contact friction between the braking structure and roller two, roller two can be quickly stopped from continuing to roll, thus achieving emergency braking of the transfer vehicle and ensuring the safety of personnel and goods during operation.

[0017] In a preferred embodiment, the present invention can be further configured such that the braking component includes a disc brake mounted on a roller and a brake lever mounted on the armrest, wherein a brake bar is connected between the brake lever and the disc brake.

[0018] By adopting the above technical solution, when emergency braking is required, the user firmly grips the brake lever on the handrail; after the brake lever is subjected to force, the force is transmitted through the brake pads, driving the disc brake to quickly contact the second roller and generate frictional resistance. Utilizing the friction between the disc brake and the second roller, the second roller can be quickly stopped from continuing to roll, thereby achieving emergency braking of the transport vehicle, ensuring that the vehicle can be stopped promptly in case of emergencies, and guaranteeing operational safety.

[0019] In a preferred embodiment, the present invention can be further configured such that the limiting component includes a first quick clamp and a second quick clamp, the first quick clamp being connected between the rolling frame assembly and the transport box to prevent the transport box from shaking, and the second quick clamp being connected between the rolling frame assembly and the transport box to prevent the transport box from sliding horizontally.

[0020] By adopting the above technical solution, the transfer vehicle achieves a detachable connection between the transport box and the rolling frame assembly through a first quick-release clamp and a second quick-release clamp. This dual-locking structure significantly improves vehicle stability: the first quick-release clamp effectively limits significant swaying of the transport box relative to the rolling frame assembly, preventing violent vertical or horizontal swinging of the box on bumpy roads; the second quick-release clamp precisely prevents horizontal sliding of the transport box relative to the rolling frame assembly, preventing the box from shifting along the length of the frame. The two clamps work together to ensure the reliability of the connection between the box and the frame, and by specifically constraining displacement in different directions, further enhance the overall stability of the transfer vehicle during operation, providing dual protection for the safe transport of goods.

[0021] In a preferred embodiment, the present invention can be further configured as follows: rolling guide components are connected to both sides of the U-shaped plate, the rolling guide components include an X-shaped fixing plate, two corners of the X-shaped fixing plate are respectively connected to the U-shaped plate by bolts, and the other two corners are respectively provided with stepped shafts, the upper end of the stepped shaft is fitted with a limiting roller, and the lower end is helically connected with a nut, the outer circle of the limiting roller is rollingly connected to the edge of the U-shaped steel.

[0022] By adopting the above technical solution, the two limiting rollers mounted on the X-shaped fixing plate maintain a rolling connection with the edge of the U-shaped steel. This structural design can limit and correct the movement trajectory of the rolling support frame assembly in real time, effectively reducing the deviation during its movement; at the same time, by limiting the lateral sway of the rolling support frame assembly, the probability of the rollers getting stuck against the inner wall of the U-shaped groove when rolling in it can be greatly reduced, ensuring the smoothness and stability of the movement of the rolling support frame assembly.

[0023] In a preferred embodiment, the present invention can be further configured such that: the hinge assembly includes a hinge seat one, a hinge seat two, and a pin; the hinge seat one is connected to the hinge seat two via the pin; the hinge seat one is connected to the bottom of the transport box; and the hinge seat two is connected to the rolling support frame assembly.

[0024] By adopting the above technical solution, hinge seat one and hinge seat two are rotatably connected by a pin, which gives hinge seat one the freedom to rotate flexibly along the pin axis. Since hinge seat one is connected to the transport box, when the user applies external force to the transport box, the transport box can achieve stable flipping by means of the rotation of hinge seat one around the pin, ultimately achieving the operation requirement of tilting unloading.

[0025] In a preferred embodiment, the present invention can be further configured such that: two support wheel assemblies are connected at intervals at one end of the transport box near the handrail, the support wheel assembly includes a limiting U-shaped seat, a support wheel is rotatably connected inside the limiting U-shaped seat, and the support wheel is rollingly connected to the side of the upper surface of the vehicle frame.

[0026] By adopting the above technical solution, the transport box is fixedly connected to the limiting U-shaped seat, and the support wheel installed inside the limiting U-shaped seat maintains rolling contact with the side of the upper surface of the frame. This structural design transforms the sliding friction of the transport box during horizontal movement into the rolling friction of the support wheel, significantly reducing the resistance encountered by the box during movement. The reduced resistance directly brings operational convenience, meaning that the pushing force required by the user to push the transport box is significantly reduced, further improving the ease of transport box relocation operations.

[0027] In summary, this utility model has at least one of the following beneficial technical effects:

[0028] When using the transfer vehicle, goods can be flexibly placed in the transport bins. To unload, simply operate the limit switch to release the lock, then easily push the transport bins to move. Finally, flipping the transport bins allows for quick unloading using gravity. This eliminates the need to flip the entire transfer vehicle, significantly reducing labor intensity and improving unloading convenience. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0030] Figure 1 This is a schematic diagram of a preferred embodiment of a transfer vehicle for convenient unloading according to the present invention.

[0031] Figure 2 yes Figure 1 A schematic diagram showing the connection between the rolling frame assembly, the rolling support frame assembly, and the rolling guide assembly.

[0032] Figure 3 yes Figure 2 A schematic diagram of the connection between the rotating mounting base and the roller.

[0033] Figure 4 yes Figure 1 A schematic diagram of the connection between the rolling support frame assembly and the rolling guide assembly.

[0034] In the diagram: 1. Transport bin; 20. Rolling frame assembly; 30. Rolling support frame assembly; 40. Articulated assembly; 50. Limiting assembly; 60. Rolling guide assembly; 70. Support wheel assembly;

[0035] 21. U-shaped chute; 22. Chassis body; 23. U-shaped steel; 24. Rotary mounting base; 25. Roller 1;

[0036] 26. U-shaped fixing base; 27. Two rollers; 28. Handrail; 29. ​​Brake component;

[0037] 241. Sleeve; 242. Fixed shaft; 243. U-shaped mounting base;

[0038] 291. Disc brake; 292. Brake lever; 293. Brake bar;

[0039] 31. Roller body; 32. Support shaft; 33. U-shaped plate;

[0040] 41. Hinge seat one; 42. Hinge seat two; 43. Pin;

[0041] 51. First quick-release clamp; 52. Second quick-release clamp;

[0042] 61. X-shaped fixing plate; 62. Stepped shaft; 63. Limiting roller;

[0043] 71. Limiting U-shaped seat; 72. Support wheel. Detailed Implementation

[0044] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0045] It should be noted that these figures are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0046] Reference Figures 1-4 The present invention discloses a transfer vehicle for easy unloading, comprising: a rolling frame assembly 20 and a transport box 1. The rolling frame assembly 20 includes two symmetrically arranged U-shaped chutes 21.

[0047] It also includes a rolling support frame assembly 30, on both sides of which are connected two roller bodies 31 located in corresponding U-shaped slide grooves 21, and the roller bodies 31 are connected to the inner wall of the U-shaped slide grooves 21 in a rolling connection.

[0048] The rolling support frame assembly 30 also includes two support shafts 32, with a U-shaped plate 33 connecting the two support shafts 32. Roller bodies 31 are respectively fitted onto both ends of each support shaft 32, and the roller bodies 31 are located within corresponding U-shaped grooves 21. The two support shafts 32 are indirectly fixed together by the U-shaped plate 33 to form an integral structure, and the roller bodies 31 at both ends of the support shafts 32 can roll flexibly within the U-shaped grooves 21, reducing the resistance encountered during the movement of the rolling support frame assembly 30.

[0049] At least two hinge components 40 are connected at intervals to one end of the rolling support frame assembly 30. The hinge components 40 are connected to the bottom of the transport hopper 1. Each hinge component 40 includes a first hinge seat 41, a second hinge seat 42, and a pin 43. The first hinge seat 41 is connected to the second hinge seat 42 via the pin 43, and the second hinge seat 42 is connected to the bottom of the transport hopper 1. The second hinge seat 42 is connected to the rolling support frame assembly 30. The first hinge seat 41 and the second hinge seat 42 are rotatably connected via the pin 43, giving the first hinge seat 41 the freedom to rotate flexibly along the axis of the pin 43. Since the first hinge seat 41 is connected to the transport hopper 1, when the user applies external force to the transport hopper 1, the transport hopper 1 can achieve stable tilting by means of the rotation of the first hinge seat 41 around the pin 43, ultimately achieving the operational requirement of tilting unloading.

[0050] It also includes a limiting component 50 that prevents the transport bin 1 from moving relative to the rolling frame assembly 20.

[0051] The limiting component 50 includes a first quick clamp 51 and a second quick clamp 52. The first quick clamp 51 is connected between the rolling frame assembly 20 and the transport box 1, and is suitable for preventing the transport box 1 from shaking. The second quick clamp 52 is connected between the rolling frame assembly 20 and the transport box 1, and is suitable for preventing the transport box 1 from sliding horizontally. The transfer vehicle achieves a detachable connection between the transport box 1 and the rolling frame assembly 20 through the first quick clamp 51 and the second quick clamp 52. The dual locking structure greatly improves the vehicle's driving stability: the first quick clamp 51 can effectively limit the transport box 1 from shaking significantly relative to the rolling frame assembly 20, avoiding violent up-and-down or left-and-right swaying of the box under bumpy road conditions; the second quick clamp 52 can precisely prevent the transport box 1 from sliding horizontally relative to the rolling frame assembly 20, preventing the box from shifting along the length of the frame. The two clamps work together to ensure the reliability of the connection between the material box and the frame, and further enhance the overall stability of the transfer vehicle during operation by specifically restraining displacement in different directions, providing double protection for the safe transportation of goods.

[0052] Rolling guide assemblies 60 are connected to both sides of the U-shaped plate 33. Each rolling guide assembly 60 includes an X-shaped fixing plate 61. Two corners of the X-shaped fixing plate 61 are connected to the U-shaped plate 33 by bolts, and two other corners are fitted with stepped shafts 62. Limiting rollers 63 are fitted to the upper end of the stepped shafts 62, and nuts are screwed to the lower end. The outer circumference of the limiting rollers 63 is in rolling contact with the edge of the U-shaped steel 23. Both limiting rollers 63 mounted on the X-shaped fixing plate 61 maintain a rolling connection with the edge of the U-shaped steel 23. This structural design can limit and correct the movement trajectory of the rolling support frame assembly 30 in real time, effectively reducing the deviation during its movement. Simultaneously, by limiting the lateral sway of the rolling support frame assembly 30, the probability of the rollers 31 getting stuck against the inner wall of the U-shaped groove 21 while rolling within it can be significantly reduced, ensuring the smoothness and stability of the rolling support frame assembly 30's movement.

[0053] The rolling frame assembly 20 also includes a frame body 22, on which two U-shaped steels 23 are symmetrically connected. The U-shaped steels 23 are provided with the U-shaped grooves 21. Two rotating mounting seats 24 are connected at intervals at one end of the frame body 22. Rollers 25 are connected to the rotating mounting seats 24 respectively. Two U-shaped fixing seats 26 are connected at intervals at the other end of the frame body 22. Rollers 27 are connected to the U-shaped fixing seats 26 respectively. A handrail 28 is connected to the end of the frame body 22 near the rollers 25. The rotating mounting seat 24 includes a sleeve 241 connected to the frame body 22 and a fixed shaft 242 rotatably connected to its inner hole. The lower end of the fixed shaft 242 is connected to a U-shaped mounting seat 243. The rollers 25 are installed in the U-shaped mounting seat 243. It also includes brake components 29 for braking the rollers 27 respectively. With the coordinated action of roller 25 and roller 27, the user only needs to hold the handle 28 and apply pushing force to easily drive the transfer vehicle forward, meeting the basic movement requirements for cargo transfer. Since the fixed shaft 242 and the inner hole of the sleeve 241 adopt a rotating connection structure, when the user applies a steering force to the side of the handle 28, the fixed shaft 242 can rotate flexibly within the sleeve 241, thereby changing the rolling direction of roller 25 and enabling convenient adjustment of the transfer vehicle's driving direction to adapt to path changes in different operating scenarios. When encountering emergencies such as pedestrians crossing or obstacles blocking the way, requiring immediate stopping, the user can operate the brake 29. Through the contact friction between the braking structure and roller 27, roller 27 can be quickly stopped from continuing to roll, thus achieving emergency braking of the transfer vehicle and ensuring the safety of personnel and goods during operation.

[0054] The braking component 29 includes a disc brake 291 mounted on roller 27 and a brake lever 292 mounted on the handrail 28. A brake strip 293 connects the brake lever 292 and the disc brake 291. When emergency braking is required, the user grips the brake lever 292 on the handrail 28 tightly. After the brake lever 292 is subjected to force, the force is transmitted through the brake strip 293, driving the disc brake 291 to quickly contact roller 27 and generate frictional resistance. With the help of the friction between the disc brake 291 and roller 27, roller 27 can be quickly stopped from rolling, thereby achieving emergency braking of the transport vehicle, ensuring that the vehicle can be stopped in time in case of emergencies and ensuring operational safety.

[0055] Two support wheel assemblies 70 are connected at intervals to one end of the transport bin 1 near the handle 28. Each support wheel assembly 70 includes a limiting U-shaped seat 71, within which a support wheel 72 is rotatably connected. The support wheel 72 is in rolling contact with the side of the upper surface of the frame 22. The transport bin 1 is fixedly connected to the limiting U-shaped seat 71, while the support wheel 72, mounted inside the limiting U-shaped seat 71, maintains rolling contact with the side of the upper surface of the frame 22. This structural design converts the sliding friction of the transport bin 1 during horizontal movement into rolling friction of the support wheel 72, significantly reducing the resistance encountered during the bin's movement. This reduced resistance directly improves operational convenience, as the pushing force required to move the transport bin 1 is significantly reduced, further enhancing the ease of movement of the transport bin 1.

[0056] The implementation principle of this embodiment is as follows: In use, the goods are first laid flat in the transport container 1; some goods can be stacked as needed. After the user pushes the transfer vehicle to the designated placement area, they first operate the limiting component 50 to release the locking state between the transport container 1 and the rolling frame assembly 20. Since the transport container 1 is connected to the rolling support frame assembly 30 via the hinge component 40, and the rollers 31 on the rolling support frame assembly 30 can roll flexibly within the U-shaped groove 21 of the rolling frame assembly 20, the user only needs to apply a small force to push the transport container 1 towards one end of the rolling frame assembly 20. After the transport container 1 is in place, the door at one end is opened, and the user then applies appropriate force to flip the transport container 1, causing the door to tilt downwards in an unloading posture. In this state, the goods inside the transport container 1 will quickly slide to the ground under gravity, efficiently completing the unloading operation. The entire process does not require the user to apply significant force to flip the entire transfer vehicle, greatly reducing labor intensity and significantly improving operational convenience.

[0057] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A transfer car convenient to unload, characterized in that, include: A rolling frame assembly (20) and a transport bin (1), wherein the rolling frame assembly (20) includes two symmetrically arranged U-shaped grooves (21); It also includes a rolling support frame assembly (30), on which two roller bodies (31) located in corresponding U-shaped grooves (21) are connected at intervals on both sides of the rolling support frame assembly (30), and the roller bodies (31) are connected to the inner wall of the U-shaped grooves (21) in a rolling connection. One end of the rolling support frame assembly (30) is connected to at least two hinge assemblies (40) at intervals, and the hinge assembly (40) is connected to the bottom of the transport box (1). It also includes a limiting component (50) to prevent the transport bin (1) from moving relative to the rolling frame assembly (20).

2. The dumper-aided transfer carriage according to claim 1, characterized in that The rolling support frame assembly (30) also includes two support shafts (32), and a U-shaped plate (33) is connected between the two support shafts (32). The two ends of the support shafts (32) are respectively fitted with roller bodies (31), and the roller bodies (31) are located in the corresponding U-shaped grooves (21).

3. The convenient unloading transfer vehicle according to claim 2, characterized in that, The rolling frame assembly (20) also includes a frame body (22), on which two U-shaped steels (23) are symmetrically connected. The U-shaped steels (23) are provided with the U-shaped grooves (21). Two rotating mounting seats (24) are connected at intervals at one end of the frame body (22). Roller 1 (25) is connected in each of the rotating mounting seats (24). Two U-shaped fixing seats (26) are connected at intervals at the other end of the frame body (22). Roller 2 (27) is connected in each of the U-shaped fixing seats (26). A handrail (28) is connected to one end of the vehicle frame (22) near the first roller (25); The rotary mounting base (24) includes a sleeve (241) connected to the frame body (22) and a fixed shaft (242) rotatably connected to its inner hole. The lower end of the fixed shaft (242) is connected to a U-shaped mounting base (243), and the roller (25) is installed in the U-shaped mounting base (243). It also includes brake components (29) for braking roller two (27).

4. The convenient unloading transfer vehicle according to claim 3, characterized in that, The braking component (29) includes a disc brake (291) mounted on roller two (27) and a brake lever (292) mounted on armrest (28), and a brake bar (293) is connected between the brake lever (292) and the disc brake (291).

5. The convenient unloading transfer vehicle according to claim 1, characterized in that, The limiting component (50) includes a first quick clamp (51) and a second quick clamp (52). The first quick clamp (51) is connected between the rolling frame assembly (20) and the transport box (1) and is adapted to prevent the transport box (1) from shaking. The second quick clamp (52) is connected between the rolling frame assembly (20) and the transport box (1) and is adapted to prevent the transport box (1) from sliding horizontally.

6. The convenient unloading transfer vehicle according to claim 3, characterized in that, Rolling guide components (60) are connected to both sides of the U-shaped plate (33). The rolling guide components (60) include an X-shaped fixing plate (61). The two corners of the X-shaped fixing plate (61) are connected to the U-shaped plate (33) by bolts. The other two corners are respectively provided with stepped shafts (62). The upper end of the stepped shaft (62) is fitted with a limiting roller (63), and the lower end is screwed with a nut. The outer circle of the limiting roller (63) is rolledly connected to the edge of the U-shaped steel (23).

7. The convenient unloading transfer vehicle according to claim 1, characterized in that, The hinge assembly (40) includes a hinge seat one (41), a hinge seat two (42) and a pin (43). The hinge seat one (41) is connected to the hinge seat two (42) through the pin (43). The hinge seat one (41) is connected to the bottom of the transport box (1). The hinge seat two (42) is connected to the rolling support frame assembly (30).

8. The convenient unloading transfer vehicle according to claim 3, characterized in that, Two support wheel assemblies (70) are connected at intervals at one end of the transport box (1) near the handrail (28). The support wheel assembly (70) includes a limiting U-shaped seat (71), and a support wheel (72) is rotatably connected inside the limiting U-shaped seat (71). The support wheel (72) is rolled to the side of the upper surface of the frame body (22).

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