Foldable goods shelf

Abstract

The utility model discloses a foldable goods shelf which comprises a bottom frame, a folding device is installed on the bottom frame, a limiting device is arranged above the bottom frame and comprises a clamping rod, a clamping sleeve, a releasing sleeve, a releasing plate, a releasing groove, a clamping groove and a clamping block, the releasing sleeve is installed on the outer side of the clamping sleeve in a rotating mode, and the releasing groove is of a variable-diameter structure and is formed in the releasing sleeve. The clamping groove is formed in the outer side of the clamping rod, the clamping block is clamped into the clamping groove, a locking mechanism is installed on the outer side of the clamping sleeve and comprises a locking sleeve, a movable spring, a fixed block and movable blocks, the locking sleeve is movably installed on the outer side of the clamping sleeve through threads, and the two ends of the movable spring are connected with the two adjacent movable blocks correspondingly; according to the goods shelf capable of being flexibly unfolded and folded, the goods shelf can be flexibly unfolded and folded, the goods shelf can be conveniently limited in the unfolded state, and meanwhile the structural stability is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of foldable shelving technology, and more specifically, to a foldable shelving. Background Technology

[0002] In the current commercial retail and logistics industry, shelving serves as the infrastructure for the transportation and storage of goods. Its design and functionality directly affect space utilization and efficiency. However, the traditional shelving design in the current technology has many functional defects and application limitations.

[0003] First, traditional shelving generally adopts a fixed structural design, lacking the necessary folding and deformation capabilities. This rigid design causes the shelving to occupy a large amount of space even when not in use, making it impossible to achieve flexible allocation and efficient utilization of space. This defect is particularly prominent. Fixed shelving cannot be reduced in size or transformed in form, which necessitates the allocation of additional storage space for idle shelving. This not only increases operating costs but also reduces the overall space utilization efficiency, severely restricting the flexibility of shelving use and the economic benefits generated.

[0004] Secondly, while some foldable shelves on the market have solved the space occupation problem, they have introduced new technical obstacles in actual operation. When these shelves are unfolded into working condition, operators usually need to use professional tools such as wrenches and screwdrivers to lock and fix the folding parts. This tool-dependent design makes the unfolding and folding process of the shelves cumbersome and complicated, which not only prolongs the preparation time, but also puts higher demands on the professional skills of the operators. When tools are scarce, manpower is tight, or there is a need to quickly set up the shelves, this operation method is particularly inconvenient, significantly reducing work efficiency. More importantly, it increases equipment maintenance costs and also increases the risk of equipment failure due to lost parts.

[0005] Furthermore, some improved shelving systems introduced in the industry to address the aforementioned issues attempt to achieve tool-free operation through simple mechanical structures using plug-in mechanisms and snap-fit ​​holes. However, these seemingly progressive designs still suffer from serious structural defects. Due to their overly simplistic fixing mechanisms, in actual commercial environments, shelving frequently faces various external impacts and vibrations, such as bumps caused by uneven ground and unintentional collisions. Under these external forces, the simple plug-in fixing structure is prone to loosening, deformation, or displacement, leading to the gradual failure of the locking mechanism. More seriously, when the fixing device completely detaches, the shelving may suddenly fold under load, causing not only the loss of goods but also potential safety accidents and personal injury to workers. This potential safety hazard seriously affects the practicality and market promotion of foldable shelving, restricting the possibility of commercial facilities developing towards greater efficiency and flexibility. Utility Model Content

[0006] (a) Technical problems to be solved

[0007] In view of the problems existing in the prior art, this utility model provides a foldable shelf to solve the technical problems mentioned in the background art.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, this utility model provides the following technical solution: a foldable shelf, including a base frame, a folding device installed on the base frame, a limiting device provided above the base frame, the limiting device including a locking rod, a locking sleeve, a release sleeve, a release plate, a release groove, a locking groove, and a locking block, the locking rod being detachably inserted into the inner side of the locking sleeve, the release sleeve being rotatably installed on the outer side of the locking sleeve, the release plate being slidably located in the release groove, the release groove being a variable diameter structure opened in the release sleeve, the locking groove being opened on the outer side of the locking rod, the locking block being fixedly connected to one side of the release plate, the locking block being snapped into the locking groove, a locking mechanism being installed on the outer side of the locking sleeve, the locking mechanism including a locking sleeve, a movable spring, a fixed block, and a movable block, the locking sleeve being movably installed on the outer side of the locking sleeve by a thread, the two ends of the movable spring being respectively connected to two adjacent movable blocks, a plurality of fixed blocks being fixedly installed on the outer side of the locking sleeve, and a plurality of movable blocks being movably arranged on one side of the release sleeve.

[0010] The present invention is further configured such that the folding device includes a side frame, a card holder, a front frame, a connecting block, a second connecting plate, a first connecting plate, and a longitudinal frame. The bottom end of the longitudinal frame is rotatably connected to one end of the base frame via the connecting block. One end of the second connecting plate is rotatably connected to the outside of the base frame, and one end of the first connecting plate is rotatably connected to the outside of the longitudinal frame. The other ends of the second connecting plate and the first connecting plate are rotatably connected. The two side frames are rotatably connected via the connecting block, and one side of each side frame is rotatably connected to the connecting block. One side of one side frame is rotatably connected to the longitudinal frame via the connecting block, and the other side frame is rotatably connected to the front frame via the connecting block. The bottom end of the front frame slides into the card holder, and the card holder is fixedly installed on one side of the base frame. This structural design achieves flexible folding and unfolding of the shelf through multi-point hinges, significantly reducing the space occupied in the folded state compared to traditional fixed shelves.

[0011] The present invention is further configured such that a handle is rotatably mounted on the other side of the longitudinal frame, and a collar is rotatably mounted on the handle. The collar is fitted onto the outside of the longitudinal frame, and a movable wheel is detachably mounted under the base frame. This design provides a convenient operation method through the combination of the handle and the collar, allowing users to easily control the folding and unfolding of the shelf. The collar fitted onto the outside of the longitudinal frame forms a stable locking mechanism to prevent the handle from being accidentally folded during use. The movable wheel enhances the mobility of the shelf, facilitating flexible movement and positioning in different situations.

[0012] The present invention is further configured such that a plurality of movable rails are fixedly provided on one side of the release sleeve, and a movable groove is provided on one side of the movable block. The movable groove is adapted to the movable rails, and the precise cooperation between the movable rails and the movable groove forms a guiding system to ensure that the movable block moves smoothly along a preset trajectory.

[0013] The present invention is further configured such that both the first connecting plate and the second connecting plate are provided with snap-fit ​​holes, and the snap-fit ​​rod passes through the snap-fit ​​holes provided on the first connecting plate and the second connecting plate and enters the snap-fit ​​sleeve.

[0014] The present invention is further configured such that a movable wheel is rotatably provided on one side of the movable block, and the movable wheel is engaged between two fixed blocks.

[0015] The present invention is further configured such that both the movable rail and the movable groove are T-shaped structures.

[0016] The present invention is further provided that multiple anti-slip strips are connected to the outer sides of both the release sleeve and the locking sleeve.

[0017] (III) Beneficial Effects

[0018] Compared with the prior art, the present invention provides a foldable shelf, which has the following advantages:

[0019] 1. The folding device achieves rapid folding and unfolding of the shelving through a clever combination and connection of side frames, card holders, front frame, connecting blocks, second connecting plates, first connecting plates, and longitudinal frames. The longitudinal frames are rotatably connected to the base frame via connecting blocks, the two side frames form a flexible movable structure via connecting blocks, the front frame can be precisely slid into the card holders for positioning, and the first and second connecting plates form a cross-support structure. This multi-point hinged design allows the shelving to significantly reduce its volume in the folded state, significantly saving storage and transportation space and making up for the shortcomings of traditional fixed shelving that occupies a lot of space. At the same time, the unfolding and folding of the shelving can be easily completed without any tools, making the operation simple and quick and greatly improving work efficiency.

[0020] 2. The limiting device consists of a locking rod, a locking sleeve, a release sleeve, a release plate, a release groove, a locking groove, and a locking block, forming a precise limiting system. The locking rod can be accurately inserted into the locking sleeve, the release sleeve can rotate flexibly on the outside of the locking sleeve, the release plate slides in the variable-diameter release groove, and the locking block is engaged in the locking groove. This multi-mechanical structure design eliminates the defects of traditional equipment, limiting the first and second connecting plates when the rack is unfolded; at the same time, the locking rod passes through the locking holes on the first and second connecting plates, forming a cross-structure fixation, effectively preventing the rack from accidentally folding and eliminating potential safety hazards.

[0021] 3. The locking mechanism includes a locking sleeve, a movable spring, a fixed block, and a movable block, forming a double-safety system to prevent loosening. This innovative design guides the movement trajectory of the movable block and the movable wheel through the precise fit between the movable rail and the movable groove. The locking design of the movable wheel between the two fixed blocks provides mechanical positioning for the entire mechanism. The limiting fit between the locking sleeve and the movable wheel forms an outer layer of locking protection. This multi-layered locking mechanism significantly improves the stability of the rack in complex environments. Even under conditions of uneven ground causing bumps or collisions, the locking system remains stable, completely solving the defects of traditional fixed structures that are prone to loosening and displacement. At the same time, the threaded locking sleeve can provide continuous and stable pressure, ensuring the positioning capability of the movable components, greatly extending the service life of the equipment, and improving the practicality and market competitiveness of the foldable rack. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a foldable shelf after it has been unfolded according to this utility model;

[0023] Figure 2 This is a schematic diagram of the folded structure of this utility model;

[0024] Figure 3 This is a schematic diagram of the limiting device and locking mechanism in this utility model;

[0025] Figure 4 This is a schematic diagram of the dispersed structure of the limiting device and locking mechanism in this utility model;

[0026] Figure 5 This is a schematic diagram showing the distributed cross-sectional structure of the limiting device and locking mechanism in this utility model.

[0027] In the diagram: 1. Base frame; 2. Snap-fit ​​rod; 3. Snap-fit ​​sleeve; 4. Release sleeve; 5. Release plate; 6. Release groove; 7. Snap-fit ​​groove; 8. Snap-fit ​​block; 9. Locking sleeve; 10. Movable spring; 11. Fixed block; 12. Movable block; 13. Side frame; 14. Snap-fit ​​bracket; 15. Front frame; 16. Connecting block; 17. Second connecting plate; 18. First connecting plate; 19. Longitudinal frame; 20. Handle; 21. Collar; 22. Moving wheel; 23. Movable rail; 24. Movable groove; 25. Snap-fit ​​hole; 26. Movable wheel; 27. Anti-slip strip. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0030] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0031] Please see Figures 1-5 A foldable shelf includes a base frame 1, on which a folding device is installed. A limiting device is provided above the base frame 1. The limiting device includes a locking rod 2, a locking sleeve 3, a release sleeve 4, a release plate 5, a release groove 6, a locking groove 7, and a locking block 8. The locking rod 2 is detachably inserted into the inside of the locking sleeve 3. The release sleeve 4 is rotatably installed on the outside of the locking sleeve 3. The release plate 5 is slidably located in the release groove 6. The release groove 6 has a variable diameter structure and is opened in the release sleeve 4. The locking groove 7 is opened on the outside of the locking rod 2. The locking block 8 is fixedly connected to one side of the release plate 5 and is snapped into the locking groove 7. A locking mechanism is installed on the outside of the locking sleeve 3. The locking mechanism includes a locking sleeve 9, a movable spring 10, a fixed block 11, and a movable block 12. The locking sleeve 9 is movably installed on the outside of the locking sleeve 3 by a thread. The two ends of the movable spring 10 are respectively connected to two adjacent movable blocks 12. Multiple fixed blocks 11 are fixedly installed on the outside of the locking sleeve 3. Multiple movable blocks 12 are movably arranged on one side of the release sleeve 4.

[0032] The folding device includes side frames 13, card holders 14, front frame 15, connecting blocks 16, second connecting plates 17, first connecting plates 18, and longitudinal frames 19. The bottom end of the longitudinal frame 19 is rotatably connected to one end of the base frame 1 via the connecting blocks 16. One end of the second connecting plate 17 is rotatably connected to the outside of the base frame 1, and one end of the first connecting plate 18 is rotatably connected to the outside of the longitudinal frame 19. The other ends of the second connecting plate 17 and the first connecting plate 18 are rotatably connected. The two side frames 13 are rotatably connected via the connecting blocks 16. One side of the two side frames 13 is rotatably connected to the longitudinal frame 19 via the connecting blocks 16, and the other side of the side frame 13 is rotatably connected to the front frame 15 via the connecting blocks 16. The bottom end of the front frame 15 slides into the card holder 14, and the card holder 14 is fixedly installed on one side of the base frame 1.

[0033] A handle 20 is rotatably mounted on the other side of the longitudinal frame 19. A collar 21 is rotatably mounted on the handle 20. The collar 21 is sleeved on the outside of the longitudinal frame 19. A movable wheel 22 is detachably mounted below the base frame 1.

[0034] In this embodiment, when the entire shelf needs to be folded, firstly, the collar 21 is flipped upwards so that it is no longer on the outside of the longitudinal frame 19. Then, the handle 20 is pulled downwards so that it folds onto one side of the longitudinal frame 19. Next, the multiple locking sleeves 3 and locking rods 2 are removed. Then, the left and right side frames 13 are pushed towards the middle, causing the connecting block 16 between the two side frames 13 to move inwards. The two connected side frames 13 will gradually approach each other, and the two sets of side frames 13 will simultaneously retract inwards. At the same time, the bottom of the front frame 15 will disengage from the locking mechanism. The front frame 15 slides out of the frame 14 and gradually moves towards the side of the longitudinal frame 19, so that the front frame 15 is attached to one side of two of the side frames 13, and the other two side frames 13 are attached to one side of the longitudinal frame 19. Then the bottom frame 1 is flipped upward, so that the bottom frame 1 rotates upward, and the bottom frame 1 will drive the second connecting plate 17 and the first connecting plate 18 to fold, so that the bottom frame 1 is attached to the other side of the front frame 15, thereby realizing the folding of the entire shelf. When it is necessary to unfold the entire shelf for use, simply reverse the above steps.

[0035] Please see Figures 3-5 As a further implementation of the overall equipment: a plurality of movable rails 23 are fixedly provided on one side of the release sleeve 4, and a movable groove 24 is provided on one side of the movable block 12, the movable groove 24 being adapted to the movable rails 23.

[0036] Both the first connecting plate 18 and the second connecting plate 17 have snap-fit ​​holes 25, and the snap-fit ​​rod 2 passes through the snap-fit ​​holes 25 on the first connecting plate 18 and the second connecting plate 17 and enters the snap-fit ​​sleeve 3.

[0037] One side of the movable block 12 is equipped with a movable wheel 26 that rotates and engages between two fixed blocks 11.

[0038] Both the movable rail 23 and the movable groove 24 are designed with a T-shaped structure.

[0039] Both the release sleeve 4 and the locking sleeve 9 are provided with multiple anti-slip strips 27 on their outer sides.

[0040] More specifically, when it is necessary to remove the locking sleeve 3 and the locking rod 2, first rotate the locking sleeve 9 in the forward direction, so that the locking sleeve 9 moves along the thread on the outside of the locking sleeve 3. Then, the inner wall of the locking sleeve 9 gradually stops limiting the outer side of the movable wheel 26. Then, rotate the release sleeve 4 in the forward direction. The release sleeve 4 will drive the multiple movable rails 23 set on one side to rotate in the forward direction. Then, the movable rails 23 will drive the multiple movable blocks 12 to rotate in the forward direction through the movable groove 24. This will cause the movable blocks 12 to drive the movable wheel 26 to roll out between the two fixed blocks 11. The movable wheel 26 will then drive the movable blocks 12 to slide outward along the movable rails 23 and the movable groove 24, causing the movable blocks 12 to drive the movable wheel 26 to roll outward. Spring 10 is stretched outwards, and at the same time, release sleeve 4 drives the inner variable-diameter release groove 6 to rotate in the forward direction. Then, release plate 5 moves in release groove 6, and release plate 5 drives the locking block 8 to gradually slide out of locking groove 7. Then, locking sleeve 3 is pulled to one side, so that locking sleeve 3 is no longer fitted to the outside of locking rod 2. Then, locking rod 2 is pulled to the other side, so that locking rod 2 is disengaged from locking hole 25. Then, other locking sleeves 3 and locking rods 2 are removed in accordance with the above steps. When it is necessary to reinstall locking rod 2 and locking sleeve 3, firstly, the first connecting plate 18 and the second connecting plate 1... The locking holes 25 on the first connecting plate 18 and the second connecting plate 17 are concentric. The locking rod 2 passes through the locking holes 25 on the first connecting plate 18 and the second connecting plate 17 from the inside. The locking sleeve 3 is then fitted onto the outside of the locking rod 2 from the outside. The release sleeve 4 is then rotated in the reverse direction, causing the release sleeve 4 to drive the movable block 12 and the movable wheel 26 to rotate in the reverse direction through the movable rail 23 and the movable groove 24. This causes the release sleeve 4 to drive the release groove 6 on the inside to rotate in the reverse direction. Then, the release plate 5 will drive the locking block 8 to re-engage into the locking groove 7. After the locking block 8 re-engages into the locking groove 7, the rotation of the release sleeve 4 stops, and the movable rail 23 and the movable groove 24 cooperate to drive the movable block 12 to rotate in the reverse direction. Block 12 rotates to the original position between the two fixed blocks 11. Then, the movable spring 10 resets and pulls the movable block 12 to slide inward along the movable rail 23 and the movable groove 24. Then, the movable block 12 drives the movable wheel 26 to re-engage between the original two fixed blocks 11. Then, the locking sleeve 9 rotates in the opposite direction, causing the locking sleeve 9 to move and reset. Then, the inner wall of the locking sleeve 9 limits the outer side of the movable wheel 26, preventing the movable wheel 26 and the movable block 12 from moving outward. This achieves rotational limitation on the release sleeve 4, preventing the release sleeve 4 from rotating. This ensures the stability of the fixed structure, ensures stable use after the shelf is unfolded, and ensures stable transportation of goods.

[0041] In summary, when using or operating the entire equipment: First, fold the collar 21 upwards so that it is no longer on the outside of the longitudinal frame 19. Then, pull the handle 20 downwards so that it folds to one side of the longitudinal frame 19. Next, remove the multiple locking sleeves 3 and locking rods 2. Then, push the left and right side frames 13 towards the center, causing the connecting block 16 between the two side frames 13 to move inwards. The two connected side frames 13 will gradually approach each other, and both sets of side frames 13 will simultaneously retract inwards. Simultaneously, the bottom of the front frame 15... The end will slide out from the card holder 14, and the front frame 15 will gradually move towards the side of the longitudinal frame 19, so that the front frame 15 is attached to one side of two of the side frames 13, and the other two side frames 13 are attached to one side of the longitudinal frame 19. Then the bottom frame 1 is flipped upward, so that the bottom frame 1 rotates upward, and the bottom frame 1 will drive the second connecting plate 17 and the first connecting plate 18 to fold, so that the bottom frame 1 is attached to the other side of the front frame 15, thereby realizing the folding of the entire shelf. When it is necessary to unfold the entire shelf for use, the above steps can be reversed.

[0042] When it is necessary to remove the locking sleeve 3 and the locking rod 2, first rotate the locking sleeve 9 clockwise, so that the locking sleeve 9 moves along the thread on the outside of the locking sleeve 3. Then, the inner wall of the locking sleeve 9 gradually stops limiting the outer side of the movable wheel 26. Then, rotate the release sleeve 4 clockwise. The release sleeve 4 will drive the multiple movable rails 23 set on one side to rotate clockwise. Then, the movable rails 23 will drive the multiple movable blocks 12 to rotate clockwise through the movable grooves 24. This will cause the movable blocks 12 to drive the movable wheel 26 to roll out between the two fixed blocks 11. The movable wheel 26 will also drive the movable blocks 12 to slide outward along the movable rails 23 and the movable grooves 24. This will cause the movable blocks 12 to drive the movable spring 10 to move outward. The outer side is stretched, and the release sleeve 4 will drive the inner variable-diameter release groove 6 to rotate in the forward direction. Then the release plate 5 moves in the release groove 6, and the release plate 5 will drive the locking block 8 to gradually slide out of the locking groove 7. Then the locking sleeve 3 is pulled to one side, so that the locking sleeve 3 is no longer fitted to the outside of the locking rod 2. Then the locking rod 2 is pulled to the other side, so that the locking rod 2 is disengaged from the locking hole 25. Then the other locking sleeves 3 and locking rods 2 are removed in accordance with the above steps. When it is necessary to reinstall the locking rod 2 and locking sleeve 3, firstly, the openings on the first connecting plate 18 and the second connecting plate 17 are opened. The locking holes 25 are concentric. The locking rod 2 passes through the locking holes 25 on the first connecting plate 18 and the second connecting plate 17 from the inside. The locking sleeve 3 is then fitted onto the outside of the locking rod 2 from the outside. The release sleeve 4 is then rotated in the reverse direction, causing the release sleeve 4 to drive the movable block 12 and the movable wheel 26 to rotate in the reverse direction via the movable rail 23 and the movable groove 24. This causes the release sleeve 4 to drive the release groove 6 on the inside to rotate in the reverse direction. The release plate 5 then drives the locking block 8 to re-engage in the locking groove 7. Once the locking block 8 is re-engaged in the locking groove 7, the rotation of the release sleeve 4 stops, and the movable rail 23 and the movable groove 24 cooperate to drive the movable block 12... 2. Rotate to the original two fixed blocks 11, then the movable spring 10 resets and pulls the movable block 12 to slide inward along the movable rail 23 and the movable groove 24. Then the movable block 12 will drive the movable wheel 26 to re-engage between the original two fixed blocks 11. Then rotate the locking sleeve 9 in the opposite direction, so that the locking sleeve 9 moves and resets. Then the inner wall of the locking sleeve 9 limits the outer side of the movable wheel 26, so that the movable wheel 26 and the movable block 12 cannot move outward, thereby realizing the rotation limit of the release sleeve 4, so that the release sleeve 4 will not rotate, thus ensuring the stability of the fixed structure, ensuring the stable use of the shelf after it is unfolded, and ensuring the stable transportation of goods.

[0043] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A foldable shelving unit comprising a base frame (1) characterised in that: The chassis (1) is provided with a folding device, and the chassis (1) is provided with a limiting device, the limiting device comprises a clamping rod (2), a clamping sleeve (3), a release sleeve (4), a release plate (5), a release slot (6), a clamping slot (7) and a clamping block (8), the clamping rod (2) is detachably inserted into the inner side of the clamping sleeve (3), the release sleeve (4) is rotatably installed on the outer side of the clamping sleeve (3), the release plate (5) is slidably arranged in the release slot (6), the release slot (6) is formed in the release sleeve (4) in a variable-diameter structure, the clamping slot (7) is formed on the outer side of the clamping rod (2), the clamping block (8) is fixedly connected to one side of the release plate (5), the clamping block (8) is clamped into the clamping slot (7), the clamping sleeve (3) is provided with a locking mechanism on the outer side, the locking mechanism comprises a locking sleeve (9), a movable spring (10), a fixed block (11) and a movable block (12), the locking sleeve (9) is movably installed on the outer side of the clamping sleeve (3) through threads, the movable spring (10) is connected to two adjacent movable blocks (12) at both ends, a plurality of fixed blocks (11) are fixedly installed on the outer side of the clamping sleeve (3), and a plurality of movable blocks (12) are movably arranged on one side of the release sleeve (4).

2. The collapsible rack of claim 1, wherein: The folding device comprises a side frame (13), a clamping frame (14), a front end frame (15), a connecting block (16), a second connecting plate (17), a first connecting plate (18) and a longitudinal frame (19), one end of the longitudinal frame (19) is rotatably connected to one end of the chassis (1) through the connecting block (16), one end of the second connecting plate (17) is rotatably connected to the outer side of the chassis (1), one end of the first connecting plate (18) is rotatably connected to the outer side of the longitudinal frame (19), the other end of the second connecting plate (17) and the first connecting plate (18) is rotatably connected, two side frames (13) are rotatably connected through the connecting block (16), one side of each of the two side frames (13) is rotatably connected to the connecting block (16), one side of one of the side frames (13) is rotatably connected to the longitudinal frame (19) through the connecting block (16), and one side of the other side frame (13) is rotatably connected to the front end frame (15) through the connecting block (16), the bottom end of the front end frame (15) is slid into the clamping frame (14), and the clamping frame (14) is fixedly installed on one side of the chassis (1).

3. A collapsible rack as claimed in claim 2, wherein: A handle (20) is rotatably installed on the other side of the longitudinal frame (19), a sleeve ring (21) is rotatably installed on the handle (20), the sleeve ring (21) is sleeved on the outer side of the longitudinal frame (19), and a movable wheel (22) is detachably arranged below the chassis (1).

4. A foldable rack according to any one of claims 1 to 3, wherein: A plurality of movable rails (23) are fixedly arranged on one side of the release sleeve (4), a movable slot (24) is formed in one side of the movable block (12), and the movable slot (24) is matched with the movable rail (23).

5. The collapsible rack of claim 2 wherein: Clamping holes (25) are formed in the first connecting plate (18) and the second connecting plate (17), and the clamping rod (2) penetrates the clamping holes (25) formed in the first connecting plate (18) and the second connecting plate (17) and enters the clamping sleeve (3).

6. The collapsible rack of claim 4 wherein: The movable block (12) is provided with a movable wheel (26) on one side, and the movable wheel (26) is clamped between two fixed blocks (11).

7. A collapsible rack according to claim 6, wherein: The movable rail (23) and the movable groove (24) are both designed in T-shaped structure.

8. The collapsible rack of claim 1 wherein: The release sleeve (4) and the locking sleeve (9) are both connected with a plurality of anti-skid strips (27) outside.

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