Folding box for automatic warehouse and folding method thereof

Abstract

The invention belongs to the technical field of folding boxes, and particularly discloses a folding box for an automatic warehouse and a folding method thereof.The folding box comprises a first baffle used for shielding the left side and the right side, a second baffle used for shielding the front side and the rear side, a third baffle used for shielding the upper side and a fourth baffle used for shielding the lower side; the third baffle is slidably hinged to the first guide limiting groove through a first sliding piece which is transversely and elastically telescopic, vertical limiting is formed at the upper end and the lower end of the first guide limiting groove, and the fourth baffle is slidably hinged to the second guide limiting groove through a second sliding piece which is transversely and elastically telescopic. Vertical limiting is formed at the upper end and the lower end of the second guide limiting groove; the first baffle and the second baffle are turned over through vertical movement of the third baffle and the fourth baffle, so that unfolding or folding is achieved, after one-time installation, the whole device is still connected no matter in the unfolding or folding state, loss or disorder of components is avoided, and folding and unfolding efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of folding boxes, and in particular relates to a folding box used in an automated warehouse and a folding method thereof. Background Art

[0002] In the logistics and warehousing sector, foldable storage boxes are key equipment for improving space utilization. Their folding efficiency and volume after storage directly impact storage and transportation costs. Traditional foldable boxes generally utilize a modular, multi-panel assembly structure. The assembly process relies on manual piece-by-piece assembly, which is cumbersome and time-consuming. Furthermore, existing foldable boxes still have structural redundancy after folding, leading to insufficient vertical volume compression and incomplete volume compression after folding. As a result, empty boxes still occupy a significant amount of space during storage and transportation, making it difficult to meet the efficient turnover requirements of automated warehouses. Summary of the Invention

[0003] In view of the problems of the existing technology such as complex folding structure and low installation efficiency, a folding box for automated warehouses and a folding method thereof are proposed. The present invention provides the following technical solutions:

[0004] The folding box for an automated warehouse comprises a first baffle for covering the left and right sides, a second baffle for covering the front and rear sides, a third baffle for covering the upper side, and a fourth baffle for covering the lower side, the first baffle comprises a first hinge, a first upper baffle and a first lower baffle arranged up and down, the lower end of the first upper baffle is hinged to the first hinge, and the upper end is slidably hinged to the upper end of the third baffle; the upper end of the first lower baffle is hinged to the first hinge, and the lower end is slidably hinged to the lower end of the fourth baffle; the second baffle comprises a second hinge, a second upper baffle and a second lower baffle arranged up and down, one end of the second upper baffle and the second lower baffle are jointly hinged to the second hinge; a second hinge is arranged on the left and right sides of each second upper baffle. A guide limit groove, a second guide limit groove is arranged on the left and right sides of each second lower baffle, and the upper and lower ends of the first guide limit groove and the second guide limit groove extend outward to form a limit part; the third baffle is slidably hinged to the first guide limit groove through a first sliding member that is elastically telescopic in the transverse direction, forming a vertical limit at the upper and lower ends of the first guide limit groove, and the fourth baffle is slidably hinged to the second guide limit groove through a second sliding member that is elastically telescopic in the transverse direction, forming a vertical limit at the upper and lower ends of the second guide limit groove; the third baffle moves downward and the fourth baffle moves upward, driving the first upper baffle and the first lower baffle to fold outward. After moving to the end, the second upper baffle and the second lower baffle fold inward to achieve folding and storage.

[0005] Preferably, a side portion of the second hinge is fixedly connected with a slot, and the first hinge can be operably inserted into the slot.

[0006] Preferably, the first hinged member includes a first hinged tube and a second hinged tube which are symmetrically arranged up and down and have openings on the sides. The lower end of the first upper baffle is fixedly connected to a first hinged protrusion, which is inserted into and rotatably connected to the first hinged tube. The upper end of the first lower baffle is fixedly connected to a second hinged protrusion, which is inserted into and rotatably connected to the second hinged tube.

[0007] Preferably, the first lower guide plate and the second upper guide plate are fixedly connected to the second hinged member, the first upper guide plate is fixedly connected to the second upper baffle plate, the first upper baffle plate and the first lower guide plate are spliced ​​to form a first guide limit groove, the second lower guide plate is fixedly connected to the second lower baffle plate, and the second upper guide plate and the second lower guide plate are spliced ​​to form a second guide limit groove.

[0008] Preferably, the side of the third baffle is fixedly connected to a first guide seat, a first telescopic rod is slidably connected to the first guide seat back and forth, the first telescopic rod is fixedly connected to a first fixing member on the outside of the first guide limit groove, a first compression spring is provided between the first fixing member and the first guide seat, and the outer end of the first telescopic rod is fixedly connected to the first sliding member.

[0009] Preferably, a first telescopic cover is fixedly connected to the first fixing member, and the first telescopic cover is inserted into and slidably connected to the front end or the rear end of the third baffle.

[0010] Preferably, a third hinge is rotatably connected to the first telescopic rod, a first sliding hinge hole is provided on the third hinge, a first connecting shaft is slidingly hinged in the first sliding hinge hole, and the first connecting shaft is connected to the first upper baffle.

[0011] Preferably, the limiting portions of the first guide limiting groove and the second guide limiting groove are L-shaped or arc-shaped.

[0012] Preferably, a placement opening is provided on the third baffle, and a handle is connected to the third baffle.

[0013] A folding box folding method is based on a folding box for an automated warehouse, wherein the unfolding step comprises:

[0014] S11, folding and unlocking, moving the first sliding member and the second sliding member so that the third baffle and the fourth baffle can move upward;

[0015] S12, pull the third baffle upwards and pull the fourth baffle downwards;

[0016] S13, unfolding; under the action of step S12, the second upper baffle and the second lower baffle are flipped to a vertical state, the upper end of the first upper baffle moves upward, the lower end of the first upper baffle moves laterally toward the second hinge, the upper end of the first lower baffle moves laterally toward the second hinge, and the lower end of the second upper baffle moves downward;

[0017] S14, unfold and lock; the first limit member and the second limit member move to the limit portions on the upper and lower sides under the action of elasticity to form a vertical limit, and the first hinge member is plugged and connected to the second hinge member;

[0018] The folding steps include:

[0019] S21, unfold and unlock, move the first sliding member and the second sliding member so that the third baffle and the fourth baffle can move vertically, and the first hinge member is separated from the second hinge member;

[0020] S22, pull the third baffle downward, and pull the fourth baffle upward;

[0021] S23, folding; under the action of step S22, the second upper baffle and the second lower baffle remain in a vertical state, the upper end of the first upper baffle moves downward, the lower end of the first upper baffle moves laterally away from the second hinge, the upper end of the first lower baffle moves laterally away from the second hinge, and the lower end of the second upper baffle moves upward;

[0022] S24, folding and locking; the first limiting member and the second limiting member move to the limiting portion at the second hinge under the action of elasticity to form a vertical limit.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. By converting the original front, back, left, and right side panels from a single unit into two hinged, coordinated parts, users can fold or unfold the entire box with a single pull or push. This significantly simplifies the cumbersome multi-step manual process of traditional folding boxes, making it particularly suitable for high-frequency turnover scenarios in automated warehouses.

[0025] 2. Deep vertical compression reduces the height of the box after folding while ensuring that the overall components remain connected. Compared with traditional folding boxes, it takes up less space and is less likely to lose components, thereby increasing the loading capacity of storage and transportation vehicles and reducing the cost of empty box return transportation.

[0026] 3. The first hinge and the second hinge are mechanically locked by interference fit. At the same time, the elastic force of the first compression spring and the second compression spring is used to keep the position of each side baffle stable, avoiding loosening of the structure due to vibration during transportation and enhancing the carrying capacity of the box. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the overall appearance structure of the present invention after expansion;

[0028] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure at A in the middle;

[0029] Figure 3 It is a schematic diagram of a partially disassembled structure;

[0030] Figure 4 yes Figure 3 Schematic diagram of the enlarged structure at B in the middle;

[0031] Figure 5 yes Figure 3 Schematic diagram of the enlarged structure at C in the middle;

[0032] Figure 6 It is a schematic diagram of the overall appearance structure after folding;

[0033] Figure 7 yes Figure 6 Schematic diagram of the enlarged structure at D in the middle;

[0034] Figure 8 yes Figure 6 Schematic diagram of the enlarged structure at E in the middle;

[0035] In the accompanying drawings, 1, first baffle; 11, first hinge; 111, first hinge tube; 112, second hinge tube; 12, first upper baffle; 121, first hinge protrusion; 13, first lower baffle; 131, second hinge protrusion; 2, second baffle; 21, second hinge; 22, second upper baffle; 23, second lower baffle; 24, first guide limit slot; 241, first upper guide plate; 242, first lower guide plate; 25, second guide limit slot; 251, second upper guide plate; 2 52. Second lower guide plate; 26. Limiting part; 3. Third baffle; 31. First sliding member; 32. First guide seat; 33. First telescopic rod; 34. First fixing member; 35. First compression spring; 36. First telescopic cover; 37. Third hinge; 38. First sliding hinge hole; 39. First connecting axis; 4. Fourth baffle; 41. Second sliding member; 42. Second telescopic rod; 43. Fourth hinge; 44. Second sliding hinge hole; 45. Second connecting axis; 5. Slot. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is clearly and completely described below in conjunction with the accompanying drawings of the present invention. The directional words mentioned in the following embodiments, such as "up", "down", "left" and "right", etc., are only referenced to the directions of the accompanying drawings. Therefore, the directional words used are used to illustrate rather than limit the invention.

[0037] like Figure 1-8As shown, a folding box for an automated warehouse includes a first baffle 1 for covering the left and right sides, a second baffle 2 for covering the front and rear sides, a third baffle 3 for covering the upper side and a fourth baffle 4 for covering the lower side. The first baffle 1 includes a first hinge 11, a first upper baffle 12 and a first lower baffle 13 arranged up and down, the lower end of the first upper baffle 12 is hinged to the first hinge 11, and the upper end is slidingly hinged to the upper end of the third baffle 3; the upper end of the first lower baffle 13 is hinged to the first hinge 11, and the lower end is slidingly hinged to the lower end of the fourth baffle 4; the second baffle 2 includes a second hinge 21, a second upper baffle 22 and a second lower baffle 23 arranged up and down, one end of the second upper baffle 22 and the second lower baffle 23 are jointly hinged to the second hinge 21; each second upper baffle 22 is provided with a first guide limit on both sides. Slot 24, second guide limit slots 25 are arranged on the left and right sides of each second lower baffle 23, and the upper and lower ends of the first guide limit slot 24 and the second guide limit slot 25 extend outward to form limit parts 26, except that the limit parts 26 at both ends are vertically arranged; the third baffle 3 is slidably hinged to the first guide limit slot 24 through a transversely elastically telescopic first sliding member 31, forming a vertical limit at the upper and lower ends of the first guide limit slot 24, and the fourth baffle 4 is slidably hinged to the second guide limit slot 25 through a transversely elastically telescopic second sliding member 41, forming a vertical limit at the upper and lower ends of the second guide limit slot 25; the third baffle 3 moves downward and the fourth baffle 4 moves upward, driving the first upper baffle 12 and the first lower baffle 13 to fold outward. After moving to the end, the second upper baffle 22 and the second lower baffle 23 fold inward to achieve folding and storage.

[0038] Furthermore, a slot 5 is fixedly connected to the side of the second hinge 21 , and the first hinge 11 can be inserted into the slot 5 and interference fit with the slot 5 to achieve fixed locking of the first baffle 1 .

[0039] Furthermore, the first hinged member 11 includes a first hinged tube 111 and a second hinged tube 112 which are symmetrically arranged in the upper and lower parts and have openings on the side. The lower end of the first upper baffle 12 is fixedly connected to a first hinged protrusion 121, and the cross-section of the first hinged protrusion 121 is Ω-shaped. The first hinged protrusion 121 is inserted into and rotatably connected to the first hinged tube 111, and is in surface contact with the first hinged tube 111. The upper end of the first lower baffle 13 is fixedly connected to a second hinged protrusion 131, and the second hinged protrusion 131 is inserted into and rotatably connected to the second hinged tube 112, and is in surface contact with the second hinged tube 112. Specifically, the first hinged tube 111 and the second hinged tube 112 are both made of plastic, have certain elasticity and self-lubricating properties, and utilize their elastic deformation to open their openings and insert components, thereby ensuring higher stability and better sealing.

[0040] Furthermore, the cross section of the second hinged member 21 is T-shaped, and the first upper baffle 12 and the first lower baffle 13 are respectively hinged at the two right-angled areas of the T-shape, which can limit the maximum expansion angle to 90 degrees, realize the limit, and improve the stability of the structure and the overall sealing. The left and right side walls are fixedly connected with the first lower guide plate 242 and the second upper guide plate 251, and the second upper baffle 22 is fixedly connected with the first upper guide plate 241. The first upper baffle plate and the first lower guide plate 242 are spliced ​​to form the first guide limit groove 24, and the second lower baffle 23 is fixedly connected. There is a second lower guide plate 252, and the second upper guide plate 251 and the second lower guide plate 252 are spliced ​​to form a second guide limit groove 25. The splicing distance between the sides away from the third baffle 3 or the fourth baffle 4 is zero or a small value, which is smaller than the splicing distance on the side close to the third baffle 3 or the fourth baffle 4. The butt joint surface is an inclined surface, which automatically limits the position after joining. Under the action of elastic force, the first sliding member 31 or the second sliding member 41 will contact the side away from the third baffle 3 or the fourth baffle 4, leaving a gap with the other side, which can ensure the smoothness of up and down sliding. By setting the first guide limit groove 24 and the second guide limit groove 25 in sections, the first upper guide plate 241 can be flipped along with the first upper baffle 12, and the second lower guide plate 252 can be flipped along with the first lower baffle 13. The limit can be released at the two limit parts 26 close to each other, and flipping can be achieved.

[0041] Specifically, the first guide limiting groove 24 and the second guide groove are both T-shaped dovetail grooves, which have higher stability.

[0042] Furthermore, the side of the third baffle 3 is fixedly connected to a first guide seat 32, and a first telescopic rod 33 is slidably connected to the first guide seat 32 back and forth. The first telescopic rod 33 is fixedly connected to a first fixing member 34 on the outside of the first guide limit groove 24. A first compression spring 35 is provided between the first fixing member 34 and the first guide seat 32, and the outer end of the first telescopic rod 33 is fixedly connected to the first sliding member 31.

[0043] Furthermore, a first telescopic cover plate 36 is fixedly connected to the first fixing member 34 , and the first telescopic cover plate 36 is inserted into and slidably connected to the front end or the rear end of the third baffle 3 .

[0044] Furthermore, a third hinge 37 is rotatably connected to the first telescopic rod 33 , a first sliding hinge hole 38 is provided on the third hinge 37 , a first connecting shaft 39 is slidingly hinged in the first sliding hinge hole 38 , and the first connecting shaft 39 is connected to the first upper baffle 12 .

[0045] Furthermore, the limiting portions 26 of the first guide limiting groove 24 and the second guide limiting groove 25 are arranged in an L-shape or an arc shape.

[0046] Furthermore, a placement opening is provided on the third baffle 3, and handles are connected to the third baffle 3 and the fourth baffle 4. Furthermore, a hinged folding structure can be adopted, and the specific arrangement position will not be repeated.

[0047] Similarly, the side of the fourth baffle 4 is fixedly connected to a second guide seat, and a second telescopic rod 42 is slidably connected to the second guide seat. The second telescopic rod 42 is fixedly connected to the outside of the second guide limit groove 25 with a second fixing member. A second compression spring is provided between the second fixing member and the second guide seat, and the outer end of the second telescopic rod 42 is fixedly connected to the second sliding member 41.

[0048] Furthermore, a second telescopic cover is fixedly connected to the second fixing member, and the second telescopic cover is inserted into and slidably connected to the front end or the rear end of the fourth baffle 4 .

[0049] Furthermore, the second telescopic rod 42 is also rotatably connected to a fourth hinge 43 , the fourth hinge 43 is provided with a second sliding hinge hole 44 , a second connecting shaft 45 is slidingly hinged in the second sliding hinge hole 44 , and the second connecting shaft 45 is connected to the second lower baffle 23 .

[0050] Furthermore, the second guide limit groove 25 and the limiting portion 26 of the second guide limit groove 25 are L-shaped or arc-shaped. Even if an L-shaped setting is adopted, a rounded transition is adopted to ensure that after moving to the end of the stroke in the vertical direction, the first sliding member 31 or the second sliding member 41 is horizontally moved to offset the original vertical stroke under the action of the first compression spring 35 or the second compression spring, thereby forming a limit in the vertical direction, and through the elastic force of the spring and the interference fit between the first hinge 11 and the slot 5, the interlocking fixation of the first baffle 1, the second baffle 2, the third baffle 3 and the fourth baffle 4 is realized.

[0051] A folding box folding method is based on a folding box for an automated warehouse, wherein the unfolding step comprises:

[0052] S11, fold and unlock, move the first sliding member 31 and the second sliding member 41 so that the third baffle 3 and the fourth baffle 4 can move upward;

[0053] S12, pull the third baffle 3 upwards and pull the fourth baffle 4 downwards;

[0054] S13, unfolding; under the action of step S12, the second upper baffle 22 and the second lower baffle 23 are flipped to a vertical state, the upper end of the first upper baffle 12 moves upward, the lower end of the first upper baffle 12 moves laterally toward the second hinge 21, the upper end of the first lower baffle 13 moves laterally toward the second hinge 21, and the lower end of the second upper baffle 22 moves downward;

[0055] S14, unfold and lock; the first limit member and the second limit member move to the limit parts 26 on the upper and lower sides under the action of elasticity to form vertical limits, and the first hinge 11 is plugged and connected to the second hinge 21; when the first limit member moves, the first telescopic cover 36 also moves horizontally to the second upper baffle 22 synchronously, and when the second hinge 21 moves, the second telescopic cover also moves horizontally to the lower side of the second lower baffle 23 synchronously, thereby improving the sealing effect.

[0056] The folding steps include:

[0057] S21, unfold and unlock, move the first sliding member 31 and the second sliding member 41 through the first fixing member 34 and the second fixing member to move the third baffle 3 and the fourth baffle 4 laterally and vertically, and the first hinge 11 is disengaged from the second hinge 21;

[0058] S22, pull the third baffle 3 downward and the fourth baffle 4 upward by using the handle;

[0059] S23, folding; under the action of step S22, the second upper baffle 22 and the second lower baffle 23 remain in a vertical state, the upper end of the first upper baffle 12 moves downward, the lower end of the first upper baffle 12 moves laterally away from the second hinge 21, the upper end of the first lower baffle 13 moves laterally away from the second hinge 21, and the lower end of the second upper baffle 22 moves upward;

[0060] S24, folding and locking; the first limiting member and the second limiting member move to the limiting portion 26 at the second hinge 21 under the action of elasticity to form a vertical limit.

[0061] Throughout the entire process, except for the locked state, which requires manual release, the third baffle 3 or the fourth baffle 4 can be directly lifted and pressed, which is highly convenient. To further improve the folding efficiency, the fourth baffle 4 can be placed on a fixed platform with a smaller area than the fourth baffle 4. The third baffle 3 can be pressed down, and the reaction force of the fixed platform can be used to move the fourth baffle 4 upward.

Claims

1. A folding box for an automated warehouse, comprising a first baffle (1) for shielding the left and right sides, a second baffle (2) for shielding the front and rear sides, a third baffle (3) for shielding the upper side, and a fourth baffle (4) for shielding the lower side, characterized in that: The first baffle (1) comprises a first hinge (11), a first upper baffle (12) and a first lower baffle (13) arranged vertically, the lower end of the first upper baffle (12) being hinged to the first hinge (11), and the upper end being slidingly hinged to the upper end of the third baffle (3); the upper end of the first lower baffle (13) being hinged to the first hinge (11), and the lower end being slidingly hinged to the lower end of the fourth baffle (4); the second baffle (2) comprises a second hinge (21), a second upper baffle (22) and a second lower baffle (23) arranged vertically, one end of the second upper baffle (22) and the second lower baffle (23) being hinged to the second hinge (21); the left and right sides of each second upper baffle (22) are both provided with a first guide limit slot (24), and the left and right sides of each second lower baffle (23) are both provided with a second guide limit slot ( 25), the upper and lower ends of the first guide limit groove (24) and the second guide limit groove (25) are extended outward to form a limit portion (26); the third baffle (3) is slidably hinged to the first guide limit groove (24) through a first sliding member (31) that is elastically telescopic in the transverse direction, and a vertical limit is formed at the upper and lower ends of the first guide limit groove (24); the fourth baffle (4) is slidably hinged to the second guide limit groove (25) through a second sliding member (41) that is elastically telescopic in the transverse direction, and a vertical limit is formed at the upper and lower ends of the second guide limit groove (25); the third baffle (3) moves downward and the fourth baffle (4) moves upward, driving the first upper baffle (12) and the first lower baffle (13) to fold outward, and after moving to the end, the second upper baffle (22) and the second lower baffle (23) fold inward to achieve folding and storage.

2. A folding box for an automated warehouse according to claim 1, characterized in that: A side portion of the second hinged member (21) is fixedly connected to a slot (5), and the first hinged member (11) can be operably inserted into the slot (5).

3. A folding box for an automated warehouse according to claim 1, characterized in that: The first hinged member (11) includes a first hinged tube (111) and a second hinged tube (112) which are symmetrically arranged in an upper and lower direction and have openings on the side. The lower end of the first upper baffle (12) is fixedly connected to a first hinged protrusion (121), and the first hinged protrusion (121) is inserted into and rotatably connected to the first hinged tube (111). The upper end of the first lower baffle (13) is fixedly connected to a second hinged protrusion (131), and the second hinged protrusion (131) is inserted into and rotatably connected to the second hinged tube (112).

4. A folding box for an automated warehouse according to claim 1, characterized in that: The second hinged member (21) is fixedly connected to a first lower guide plate (242) and a second upper guide plate (251); the second upper baffle plate (22) is fixedly connected to the first upper guide plate (241); the first upper baffle plate and the first lower guide plate (242) are spliced ​​to form a first guide limiting groove (24); the second lower baffle plate (23) is fixedly connected to the second lower guide plate (252); the second upper guide plate (251) and the second lower guide plate (252) are spliced ​​to form a second guide limiting groove (25).

5. A folding box for an automated warehouse according to claim 4, characterized in that: The side of the third baffle (3) is fixedly connected to a first guide seat (32), a first telescopic rod (33) is slidably connected to the first guide seat (32) in a forward and backward manner, the first telescopic rod (33) is fixedly connected to a first fixing member (34) on the outside of the first guide limit groove (24), a first compression spring (35) sleeved on the outside of the first telescopic rod (33) is provided between the first fixing member (34) and the first guide seat (32), and the outer end of the first telescopic rod (33) is fixedly connected to the first sliding member (31).

6. A folding box for an automated warehouse according to claim 5, characterized in that: A first telescopic cover plate (36) is fixedly connected to the first fixing member (34), and the first telescopic cover plate (36) is inserted into and slidably connected to the front end or the rear end of the third baffle (3).

7. A folding box for an automated warehouse according to claim 5, characterized in that: A third hinge (37) is rotatably connected to the first telescopic rod (33), a first sliding hinge hole (38) is provided on the third hinge (37), a first connecting shaft (39) is slidingly hinged in the first sliding hinge hole (38), and the first connecting shaft (39) is connected to the first upper baffle (12).

8. The folding box for an automated warehouse according to claim 1, characterized in that: The limiting portions (26) of the first guide limiting groove (24) and the second guide limiting groove (25) are arranged in an L-shape or an arc shape.

9. The folding box for an automated warehouse according to claim 1, characterized in that: A placement opening is provided on the third baffle (3), and a handle is connected to the third baffle (3).

10. A folding box folding method, characterized in that: Based on the folding box for an automated warehouse according to claim 1, the unfolding step includes: S11, folding and unlocking, moving the first sliding member (31) and the second sliding member (41) so that the third baffle (3) and the fourth baffle (4) can move upward; S12, pull the third baffle (3) upwards, and pull the fourth baffle (4) downwards; S13, unfolding; under the action of step S12, the second upper baffle (22) and the second lower baffle (23) are flipped to a vertical state, the upper end of the first upper baffle (12) moves upward, the lower end of the first upper baffle (12) moves laterally toward the second hinge (21), the upper end of the first lower baffle (13) moves laterally toward the second hinge (21), and the lower end of the second upper baffle (22) moves downward; S14, unfold and lock; the first limiting member and the second limiting member move to the limiting portions (26) on the upper and lower sides under the action of elasticity to form a vertical limit, and the first hinge (11) is plugged and connected to the second hinge (21); The folding steps include: S21, unfold and unlock, move the first sliding member (31) and the second sliding member (41) so that the third baffle (3) and the fourth baffle (4) can move in the vertical direction, and the first hinge (11) is separated from the second hinge (21); S22, pull the third baffle (3) downward, and pull the fourth baffle (4) upward; S23, folding; under the action of step S22, the second upper baffle (22) and the second lower baffle (23) remain in a vertical state, the upper end of the first upper baffle (12) moves downward, the lower end of the first upper baffle (12) moves laterally in a direction away from the second hinge (21), the upper end of the first lower baffle (13) moves laterally in a direction away from the second hinge (21), and the lower end of the second upper baffle (22) moves upward; S24, folding and locking; the first limiting member and the second limiting member move to the limiting portion (26) at the second hinge (21) under the action of elasticity to form a vertical limit.

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