Integrated automatic bottom box for hand-held safety buckle

Abstract

The utility model discloses an integrated portable safety buckle automatic buckle bottom box, including box body, first portable part and second portable part, and the box body is from left to right in proper order including first side plate, second side plate, third side plate and fourth side plate, and the first side plate upper end and lower end are equipped with first cover plate, first bottom respectively, and the middle part of first cover plate and first side plate junction is equipped with first safety buckle, and the first portable part, second bottom are equipped with respectively in the upper end and lower end of second side plate, and the second portable part, fourth bottom are equipped with respectively in the upper end and lower end of third side plate, and the fourth bottom and second bottom are equipped with the lock slot of shape and lock tongue matching on, and the upper end of second cover plate is equipped with the second safety buckle of matching with first safety buckle, and the upper end right side of first portable part and second portable part is equipped with portable ring.

Description

Technical Field

[0001] This utility model relates to the field of packaging box technology, and in particular to an integrated hand-held safety buckle automatic bottom box. Background Technology

[0002] With the increasing demands for convenience, stability, and environmental friendliness in the product packaging industry, portable packaging boxes have been widely used in food, gifts, and daily necessities. However, existing portable packaging boxes still have many shortcomings in structural design and practical use that urgently need to be addressed: 1. Technical bottlenecks of the bottom locking structure Traditional automatic snap-on boxes typically employ a right-angle latch design, which presents two major problems: First, insufficient locking tightness, making the box bottom prone to loosening and detachment under heavy loads or during transport vibrations, failing to meet load-bearing requirements; second, the locking process is prone to jamming, as the latch and locking groove lack a guiding structure during folding, requiring significant external force to complete the latching, impacting assembly efficiency. While some improved products have optimized the latch shape, they lack auxiliary positioning structures, resulting in a risk of lateral displacement after the bottom is formed, leading to insufficient structural stability. Furthermore, existing snap-on boxes often require folding in a specific sequence, relying on manual alignment, which cannot meet the high-efficiency requirements of automated production lines. 2. Design flaws in the box lid safety latch Existing packaging box lid locking structures generally suffer from problems such as loose fastening and accidental opening: single-buckle designs lack sufficient elasticity, resulting in high resistance during fastening and potential imbalances in tightness due to variations in sheet thickness; either the fastener is too loose and easily falls off, or too tight and is difficult to open. Some products use tongue-and-groove closures, lacking an anti-detachment mechanism, making them prone to popping open during transportation and compromising the safety of the contents. Furthermore, traditional safety buckles are mostly single-use structures, resulting in decreased sealing after opening and making reuse difficult, thus limiting the recycling value of the packaging boxes. 3. The stability and practicality of the portable design are insufficient. Existing designs for the handles of portable packaging boxes have significant shortcomings: First, the handles are often separately connected to the box body (e.g., glued or riveted), resulting in weak joints that are prone to breakage when carrying heavy items, and the protruding connection also affects the aesthetics. Second, the handles and lid lack coordinated design, making the lid susceptible to deformation under stress during lifting, leading to seal failure. Third, some integrated handle structures lack reinforced protection, making the handle rings prone to fatigue damage after prolonged use, and limiting their load-bearing capacity. Furthermore, the handles of traditional portable boxes cannot fit tightly against the box body when folded, increasing space occupancy during transportation and storage. 4. Limitations in overall molding and assembly efficiency Most existing packaging boxes are modular, requiring adhesive bonding or multi-step assembly. This not only increases production processes and material waste but also fails to meet environmental protection requirements due to the use of chemical adhesives. While some one-piece products reduce assembly steps, their rigid structural design and inconsistent fit between the lid and handle result in inconvenient opening and poor versatility. For example, some products require the handle to be removed before the lid can be opened after sealing, which is cumbersome and can easily damage the packaging. Furthermore, the lack of standardized size design in existing products makes it difficult to meet the loading needs of different scenarios. 5. Shortcomings in environmental protection and recycling Traditional packaging boxes, due to their unreasonable structural design, are easily damaged after disassembly and are difficult to reuse. Some products rely on adhesives or metal connectors, requiring additional separation and processing during recycling, which increases environmental costs. Furthermore, the non-one-piece molded structure requires more space during transportation, indirectly increasing logistics energy consumption, which is inconsistent with the development trend of green packaging. Utility Model Content

[0003] The technical problem to be solved by this utility model is to address the shortcomings of the prior art by providing a simple structural design that combines a wedge-shaped locking tongue-lock groove with a guide slope and a trapezoidal buckle bottom groove for double stabilization, a double-set "buckle-slot" interference fit anti-loosening sealing safety buckle box cover, and a load-bearing handle with a reinforcing plate that works in conjunction with the handle hole. This design achieves efficient assembly, stable load-bearing capacity, reliable sealing, convenient carrying, and environmental recyclability of an integrated hand-held safety buckle automatic buckle bottom box.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: an integrated hand-held safety buckle automatic bottom box, including a box body, a first handle and a second handle. The box body includes a first side plate, a second side plate, a third side plate and a fourth side plate connected sequentially from left to right. The first side plate and the third side plate are matched in shape, and the second side plate and the fourth side plate are matched in shape. The first side plate has a first cover plate at its upper end and a first bottom plate at its lower end. A first safety buckle is provided in the middle of the connection between the first cover plate and the first side plate. The second side plate has the first handle at its upper end and a second bottom plate at its lower end. The third side plate has a second cover plate at its upper end and a third bottom plate at its lower end. The fourth side plate has the second handle at its upper end and a fourth bottom plate at its lower end. The right ends of the third bottom plate and the first bottom plate are provided with locking tongues. The fourth bottom plate and the second bottom plate are provided with locking grooves whose shapes match the locking tongues. When the first bottom plate, the second bottom plate, and the third bottom plate are connected... When the fourth base plate is folded inward, the locking tongue can elastically deform under external force and slide into the corresponding locking groove. Automatic locking is achieved through elastic recovery, forming a closed and secure box bottom. The upper end of the second cover plate is provided with a second safety buckle that matches the first safety buckle. The second cover plate matches the third side plate and can be bent forward to cover the box bottom, so that the first safety buckle and the second safety buckle are engaged. The second cover plate is connected to the first side plate to form a closed and secure box lid. The upper right side of the first and second handles are provided with matching carrying rings. The two carrying rings can be bent relative to each other and connected to each other. The middle of the second cover plate is provided with a carrying hole that fits the carrying ring and passes through the second cover plate. After the first and second handles are bent inward relative to the box bottom and the carrying rings are raised relative to the box bottom, the second cover plate bends forward, and the carrying hole passes through the carrying ring. After the second cover plate is connected to the first side plate, the box body can be lifted by the carrying ring.

[0005] As a further explanation of this utility model: Preferably, the third base plate has the same shape as the first base plate, the fourth base plate has the same shape as the second base plate, the latch is wedge-shaped with a guide slope at its front end, and the lock groove is a wedge-shaped opening that matches the shape of the latch. When the first base plate, the second base plate, the third base plate, and the fourth base plate are folded inward, the latch, under the action of external force, is guided by the guide slope to undergo elastic deformation and slide into the lock groove, achieving automatic locking through elastic recovery.

[0006] Preferably, both the third base plate and the first base plate have an inwardly recessed bottom groove on the right side of the middle. The bottom groove is trapezoidal in shape, and a limiting block is provided at the left end of the bottom of the bottom groove. When the box is formed, the two bottom grooves on the first base plate and the third base plate are engaged with each other, the limiting blocks abut against each other and limit the movement, and at the same time, the locking tongue slides into the locking groove and elastically recovers, so as to achieve a stable fastening of the bottom of the box.

[0007] Preferably, the first safety buckle includes a first buckle and a first slot. The first slot is horizontally arranged through the connection between the first cover plate and the first side plate. The first buckle is located in the middle of the first slot, with one end separated from the first cover plate by die-cutting and the other end connected to the first side plate. The second safety buckle includes a second buckle and a second slot. The second buckle is interference-fitted with the inner wall of the first slot. The second slot is horizontally arranged through the middle of the connection between the second buckle and the second cover plate. When the first cover plate bends backward and the second cover plate bends forward, the second buckle is inserted into the first slot, and the first buckle is inserted into the second slot, thus achieving the engagement of the first safety buckle and the second safety buckle.

[0008] Preferably, both the first and second safety buckles comprise two sets.

[0009] Preferably, the lower ends of the first handle and the second handle are provided with reinforcing plates. The first handle is connected to the second side plate through the reinforcing plate, and the second handle is connected to the fourth side plate through the reinforcing plate.

[0010] Preferably, the left end of the first side plate is provided with an adhesive portion, which is trapezoidal and is adhered to the inner right side of the fourth side plate, so that the first side plate and the fourth side plate are connected together.

[0011] Preferably, the first side plate has a left-right length of 195.0mm to 205.0mm and a top-bottom width of 195.0mm to 205.0mm, the second side plate has a left-right length of 95.0mm to 105.0mm, the second bottom plate has a top-bottom width of 48.0mm to 55.0mm, the second cover plate has a top-bottom width of 95.0mm to 105.0mm, and the adhesive part has a left-right length of 22.0mm to 28.0mm.

[0012] Preferably, the first side plate, the second side plate, the third side plate, the fourth side plate, the first handle, the second handle, the first cover plate, the second cover plate, the first bottom plate, the second bottom plate, the third bottom plate, and the fourth bottom plate are an integral structure.

[0013] The beneficial effects of this utility model are: Firstly, the bottom locking structure of this utility model achieves efficient, stable, and anti-detachment automatic locking. It adopts a wedge-shaped locking tongue and a locking groove with a guide slope. During folding, the locking tongue is guided by the guide slope to generate elastic deformation, allowing it to slide smoothly into the locking groove without precise alignment, completely solving the jamming problem of traditional structures and greatly improving assembly efficiency. Through the dual structure of "locking tongue-lock groove" elastic locking + "trapezoidal bottom groove-limiting block" positioning, there is no lateral displacement or longitudinal loosening after the box bottom is formed, and the load-bearing capacity is greatly improved compared with the traditional method. The bottom folding does not require a specific sequence or manual adjustment of the direction, reducing the labor cost in the production process. Secondly, this utility model achieves a reliable seal that is tight and prevents accidental opening. The first and second safety buckles adopt a bidirectional interference fit design of "buckle-slot," with no gaps at the contact surfaces after locking. This not only effectively prevents accidental opening during transportation but also blocks dust and moisture from entering, improving the storage safety of the contents. The two sets of safety buckles are symmetrically arranged to distribute the force on the lid, preventing the seal from loosening due to fatigue failure of a single buckle and meeting the needs of repeated use. The die-cut separation design of the buckle and slot means that no additional tools are needed when opening; simply pressing the buckle is enough to unlock it without damaging the lid structure, solving the problem of "difficult to open and easy to break" in traditional sealing structures. Thirdly, this utility model fulfills the practical needs of strong load-bearing capacity, stable lifting, and economical storage. The reinforcing plate enhances load-bearing strength: the reinforcing plate at the lower end of the handle increases the connection strength between the handle ring and the side panel, preventing tearing at the connection point during lifting; the handle ring precisely matches the handle hole on the second cover, allowing the handle to fit snugly against the box body after folding, without occupying extra space during transport; when upright, it is fixed by the handle hole, forming a closed-loop force distribution between the lid and the box body during lifting, preventing lid deformation and improving grip comfort; the handle, box body, and lid are an integrated structure with no additional protruding connecting parts, resulting in a clean and elegant appearance, while also avoiding the risk of detachment of separate carrying straps and extending the lifespan of the packaging box. Fourth, the entire box of this utility model is die-cut from a single sheet, requiring no adhesives or additional parts. It can be mass-produced through automated production lines, significantly improving production efficiency. When not fully formed, it can be completely unfolded and laid flat, occupying little space when stacked for storage. It can be stacked in batches during transportation, significantly reducing logistics costs. It contains no chemical adhesives or metal connectors, can be completely recycled after disassembly, and can be reassembled and reused, which is in line with the industry development trend of green packaging. At the same time, the integrated structure is not easily damaged after disassembly, making recycling and disposal simpler. Fifth, the trapezoidal adhesive design of this utility model not only ensures the firmness of the side panel connection, but also makes the box structure more regular after molding, compatible with the standardized operations of automated packaging lines, and improving the market applicability of the product. This utility model has a simple overall structure and integrates the entire process of production, transportation, use, and recycling, reducing overall costs and improving user experience, thus solving the industry pain point of existing products where "convenience and stability cannot be simultaneously achieved." Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 for Figure 1 A magnified structural diagram of part A in the middle.

[0016] Figure 3 for Figure 1A magnified structural diagram of part B.

[0017] In the diagram: 1. First side plate; 2. Second side plate; 3. Third side plate; 4. Fourth side plate; 5. First cover plate; 6. First bottom plate; 7. First handle; 8. Second bottom plate; 9. Second cover plate; 10. Third bottom plate; 11. Second handle; 12. Fourth bottom plate; 13. Locking tongue; 14. Handle ring; 15. Handle hole; 16. Bottom groove; 17. Limiting block; 18. First buckle; 19. First slot; 20. Second buckle; 21. Second slot; 22. Reinforcing piece; 23. Adhesive part. Detailed Implementation

[0018] The structural and working principles of this utility model will be further described in detail below with reference to the accompanying drawings.

[0019] like Figure 1 , Figure 2 , Figure 3As shown, this utility model is an integrated portable automatic safety buckle bottom box, including a box body, a first carrying part 7, and a second carrying part 11. The box body includes a first side plate 1, a second side plate 2, a third side plate 3, and a fourth side plate 4 connected sequentially from left to right. The first side plate 1 and the third side plate 3 are matched in shape, and the second side plate 2 and the fourth side plate 4 are matched in shape. The upper end of the first side plate 1 is provided with a first cover plate 5, and the lower end is provided with a first bottom plate 6. A first safety buckle is provided in the middle of the connection between the first cover plate 5 and the first side plate 1. The second side plate 2 has a first carrying handle 7 at its upper end and a second base plate 8 at its lower end. The third side plate 3 has a second cover plate 9 at its upper end and a third base plate 10 at its lower end. The fourth side plate 4 has a second carrying handle 11 at its upper end and a fourth base plate 12 at its lower end. Both the third base plate 10 and the first base plate 6 have a locking tongue 13 at their right ends. The fourth base plate 12 and the second base plate 8 have locking grooves (not shown in the figure) whose shapes match the locking tongue 13. When the first base plate 6, the second base plate 8, and the third base plate 10... When the fourth base plate 12 is folded inward, the locking tongue 13 can elastically deform under external force and slide into the corresponding locking groove. Automatic locking is achieved through elastic recovery, forming a closed and secure box bottom. The upper end of the second cover plate 9 is provided with a second safety buckle that matches the first safety buckle. The second cover plate 9 matches the third side plate 3 and can be bent forward to cover the box bottom, so that the first and second safety buckles are engaged. The second cover plate 9 is connected to the first side plate 1 to form a closed and secure box lid. The first handle 7 and the second... The upper right side of the handle 11 is provided with matching carrying rings 14. The two carrying rings 14 can be bent relative to each other and connected to each other. The middle of the second cover plate 9 is provided with a carrying hole 15 that is adapted to the carrying ring 14 and passes through the second cover plate 9. After the first handle 7 and the second handle 11 are bent inward relative to the bottom of the box and the carrying ring 14 is raised relative to the bottom of the box, the second cover plate 9 is bent forward and the carrying hole 15 passes through the carrying ring 14. After the second cover plate 9 is connected to the first side plate 1, the box can be lifted by the carrying ring 14.

[0020] like Figure 1 , Figure 2 As shown, the shape of the third base plate 10 is the same as that of the first base plate 6, and the shape of the fourth base plate 12 is the same as that of the second base plate 8. The locking tongue 13 is wedge-shaped with a guide slope at its front end. The locking groove is a wedge-shaped opening that matches the shape of the locking tongue 13. When the first base plate 6, the second base plate 8, the third base plate 10 and the fourth base plate 12 are folded inward, the locking tongue 13 is guided by the guide slope to undergo elastic deformation and slide into the locking groove under the action of external force, and achieves automatic locking through elastic recovery.

[0021] like Figure 1 , Figure 2As shown, both the third base plate 10 and the first base plate 6 have inwardly recessed bottom grooves 16 on the right side of their middle sections. The bottom grooves 16 are trapezoidal in shape, and a limiting stop 17 is provided at the left end of the bottom of the bottom groove 16. When the box bottom is formed, the two bottom grooves 16 on the first base plate 6 and the third base plate 10 are engaged with each other, and the limiting stop 17 abuts against each other to limit the engagement. At the same time, the locking tongue 13 slides into the locking groove and elastically recovers, thus achieving a stable engagement of the bottom of the box.

[0022] like Figure 1 , Figure 3 As shown, the first safety buckle includes a first buckle 18 and a first slot 19. The first slot 19 is horizontally positioned through the connection between the first cover plate 5 and the first side plate 1. The first buckle 18 is located in the middle of the first slot 19, with one end separated from the first cover plate 5 by die-cutting, and the other end connected to the first side plate 1. The second safety buckle includes a second buckle 20 and a second slot 21. The second buckle 20 is press-fitted with the inner wall of the first slot 19. The second slot 21 is horizontally positioned through the middle of the connection between the second buckle 20 and the second cover plate 9. The first buckle 18 is press-fitted with the inner wall of the second slot 21. When the first cover plate 5 bends backward and the second cover plate 9 bends forward, the second buckle 20 is inserted into the first slot 19, and the first buckle 18 is inserted into the second slot 21, thus achieving the engagement of the first and second safety buckles. In this embodiment, both the first and second safety buckles include two sets.

[0023] like Figure 1 , Figure 3 As shown, the lower ends of the first handle 7 and the second handle 11 are both provided with reinforcing plates 22. The first handle 7 is connected to the second side plate 2 through the reinforcing plate 22, and the second handle 11 is connected to the fourth side plate 4 through the reinforcing plate 22.

[0024] like Figure 1 As shown, the left end of the first side plate 1 is provided with an adhesive part 23, which is trapezoidal and is adhered to the inner right side of the fourth side plate 4, so that the first side plate 1 and the fourth side plate 4 are connected together.

[0025] Further, the first side plate 1 has a left-right length of 195.0mm to 205.0mm and a top-bottom width of 195.0mm to 205.0mm; the second side plate 2 has a left-right length of 95.0mm to 105.0mm; the second bottom plate 8 has a top-bottom width of 48.0mm to 55.0mm; the second cover plate 9 has a top-bottom width of 95.0mm to 105.0mm; and the adhesive portion 23 has a left-right length of 22.0mm to 28.0mm. In this embodiment, the first side plate 1 has a left-right length of 201.0mm and a top-bottom width of 200.0mm; the second side plate 2 has a left-right length of 102.0mm; the second bottom plate 8 has a top-bottom width of 51.0mm; the second cover plate 9 has a top-bottom width of 102.0mm; and the adhesive portion 23 has a left-right length of 25.0mm.

[0026] Furthermore, the first side plate 1, the second side plate 2, the third side plate 3, the fourth side plate 4, the first handle 7, the second handle 11, the first cover plate 5, the second cover plate 9, the first bottom plate 6, the second bottom plate 8, the third bottom plate 10, and the fourth bottom plate 12 are an integral structure.

[0027] The embodiments described with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. In the description of this application, it should be understood that the terms "front," "rear," "left," "right," "upper," "lower," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application.

[0028] The above description is merely a preferred embodiment of this utility model. Any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical solution of this utility model shall fall within the scope of the technical solution of this utility model.

Claims

1. An integrated hand-held safety buckle automatic bottom box, characterized in that: The device includes a box body, a first handle, and a second handle. The box body comprises a first side plate, a second side plate, a third side plate, and a fourth side plate connected sequentially from left to right. The first and third side plates are shaped to match each other, and the second and fourth side plates are shaped to match each other. The first side plate has a first cover plate at its upper end and a first bottom plate at its lower end. A first safety buckle is located at the center of the connection between the first cover plate and the first side plate. The second side plate has the first handle at its upper end and a second bottom plate at its lower end. The third side plate has a second cover plate at its upper end and a third bottom plate at its lower end. The fourth side plate has the second handle at its upper end and a fourth bottom plate at its lower end. The right ends of the third and first bottom plates are each equipped with a locking tongue. The fourth and second bottom plates have locking grooves whose shapes match the locking tongues. When the first, second, third, and fourth bottom plates are folded inward, the locking tongue can be engaged by external force. The bottom of the box undergoes elastic deformation and slides into the corresponding locking groove. It automatically locks through elastic recovery, forming a closed and secure box bottom. The upper end of the second cover plate is provided with a second safety buckle that matches the first safety buckle. The second cover plate matches the third side plate and can be bent forward to cover the box bottom, so that the first safety buckle and the second safety buckle are engaged. The second cover plate is connected to the first side plate to form a closed and secure box lid. The upper right side of the first and second handles are provided with matching carrying rings. The two carrying rings can be bent relative to each other and connected to each other. The middle of the second cover plate is provided with a carrying hole that fits the carrying ring and passes through the second cover plate. After the first and second handles are bent inward relative to the box bottom and the carrying rings are raised relative to the box bottom, the second cover plate bends forward, and the carrying hole passes through the carrying ring. After the second cover plate is connected to the first side plate, the box can be lifted by the carrying rings.

2. The integrated hand-held safety buckle automatic bottom box according to claim 1, characterized in that: The third base plate has the same shape as the first base plate, and the fourth base plate has the same shape as the second base plate. The latch is wedge-shaped with a guide slope at its front end. The lock groove is a wedge-shaped opening that matches the shape of the latch. When the first, second, third, and fourth base plates are folded inward, the latch, under the action of external force, is guided by the guide slope to undergo elastic deformation and slide into the lock groove, achieving automatic locking through elastic recovery.

3. The integrated hand-held safety buckle automatic bottom box according to claim 2, characterized in that: Both the third base plate and the first base plate have inwardly recessed bottom grooves on the right side of their middle sections. The bottom grooves are trapezoidal in shape, and a limiting stop is provided at the left end of the bottom of the bottom groove. When the box is formed, the two bottom grooves on the first base plate and the third base plate interlock with each other, and the limiting stops abut against each other to limit the movement. At the same time, the locking tongue slides into the locking groove and elastically returns to its original position, thus achieving a stable locking of the bottom of the box.

4. The integrated hand-held safety buckle automatic bottom box according to claim 3, characterized in that: The first safety buckle includes a first buckle and a first slot. The first slot is horizontally positioned through the connection between the first cover plate and the first side plate. The first buckle is located in the middle of the first slot, with one end separated from the first cover plate by die-cutting and the other end connected to the first side plate. The second safety buckle includes a second buckle and a second slot. The second buckle is press-fitted with the inner wall of the first slot. The second slot is horizontally positioned through the middle of the connection between the second buckle and the second cover plate. When the first cover plate bends backward and the second cover plate bends forward, the second buckle inserts into the first slot, and the first buckle inserts into the second slot, thus achieving the engagement of the first and second safety buckles.

5. The integrated hand-held safety buckle automatic bottom box according to claim 4, characterized in that: The first and second safety buckles each consist of two sets.

6. The integrated hand-held safety buckle automatic bottom box according to claim 5, characterized in that: The lower ends of the first and second handles are provided with reinforcing plates. The first handle is connected to the second side plate through the reinforcing plate, and the second handle is connected to the fourth side plate through the reinforcing plate.

7. The integrated hand-held safety buckle automatic bottom box according to claim 6, characterized in that: The left end of the first side plate is provided with an adhesive part, which is trapezoidal and is adhered to the inner right side of the fourth side plate, so that the first side plate and the fourth side plate are connected together.

8. The integrated hand-held safety buckle automatic bottom box according to claim 7, characterized in that: The first side plate has a left-right length of 195.0mm to 205.0mm and a top-bottom width of 195.0mm to 205.0mm. The second side plate has a left-right length of 95.0mm to 105.0mm. The second bottom plate has a top-bottom width of 48.0mm to 55.0mm. The second cover plate has a top-bottom width of 95.0mm to 105.0mm. The adhesive part has a left-right length of 22.0mm to 28.0mm.

9. The integrated hand-held safety buckle automatic buckle bottom box according to any one of claims 2 to 8, characterized in that: The first side plate, the second side plate, the third side plate, the fourth side plate, the first handle, the second handle, the first cover plate, the second cover plate, the first bottom plate, the second bottom plate, the third bottom plate, and the fourth bottom plate are an integral structure.

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