Tablet computer full-paper card transportation packaging box
Through the folding design of the whole paper card and the fixed connection mechanism, the problem of difficult degradation and high cost of EPS and EPE materials is solved, and an environmentally friendly and economical tablet transportation and packaging solution is achieved.
Patent Information
- Application Number
- CN202421640626.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-11
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-07-11
AI Technical Summary
The EPS and EPE buffer materials used in existing tablet shipping packaging are difficult to degrade, costly, and are prone to damage products.
The full paper card folding design is adopted, including the bottom cover liner, the first body liner and the second body liner. The whole paper card material is used to form a buffer structure through folding, and a fixed connection mechanism is used to ensure the integrity and stability of the liner.
The degradability of buffer materials is achieved, cost reduction, and at the same time it provides effective product protection, meets environmental protection requirements and improves market acceptance.
Smart Images
Figure CN223149012U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to packaging technology, in particular to a transportation packaging box for flat-panel products. Background Art
[0002] The transportation packaging of tablet computers generally adopts the combination of an inner buffer liner and a paper box. The inner buffer liner is usually made of materials such as EPS and EPE. When using EPS as the buffer liner, such foam cannot be recycled and is listed as a prohibited product in European and American countries, and a tax for recycling and treatment is additionally charged. Moreover, polystyrene foam is brittle and easily breaks after being impacted, reducing or losing its protective effect. In addition, the forming cost of the buffer material is relatively high. Summary of the Invention
[0003] The utility model adopts a full-paper card folding solution, which can solve the technical problems in the prior art that EPS and EPE are not easily degraded and the forming cost of EPS and EPE materials is high.
[0004] The transportation packaging box for tablet computers designed by the utility model includes an outer box, a bottom cover inner liner, a first main body inner liner and a second main body inner liner which are arranged in the outer box and stacked in sequence. The bottom cover inner liner is a disk body with baffles folded around its periphery. The first main body inner liner is a frame with tubular buffer structures around its periphery. The second main body inner liner is a disk-shaped structure with tubular buffer structures around its periphery and a receiving space in the middle.
[0005] The bottom cover inner liner of the utility model includes a bottom cover bottom plate, a first longitudinal folding vertical plate and a second longitudinal folding vertical plate which are respectively extended and arranged along the two opposite longitudinal sides of the bottom cover bottom plate, a first transverse folding vertical plate and a second transverse folding vertical plate which are respectively extended and arranged along the two opposite transverse sides of the bottom cover bottom plate. First plug-in plates are respectively extended and arranged along the two transverse sides of the first longitudinal folding vertical plate. There are creases pressed between the plates. A first hand hole connecting the two plates is opened at the crease between the first longitudinal folding vertical plate and the second longitudinal folding vertical plate. A first jack is opened at the crease between the bottom cover bottom plate and the first transverse folding vertical plate. A first card is extended and arranged at the position corresponding to the first jack on the second transverse folding vertical plate. A second jack is opened at the crease between the bottom cover bottom plate and the first longitudinal folding vertical plate. A second card is extended and arranged at the position corresponding to the second jack on the second longitudinal folding vertical plate.
[0006] A further improvement of the present utility model lies in that: the first main body lining includes a first bottom plate, a connecting vertical plate, a first main lining cover plate and a second plugging plate which are sequentially extended along one side of the first bottom plate. The middle of the first bottom plate is cut into four pairwise symmetrical parts. Among them, the two transversely opposite parts are the third longitudinal folding vertical plate, the first longitudinal folding horizontal plate, the fourth longitudinal folding vertical plate and the second longitudinal folding horizontal plate which are sequentially extended inward along the longitudinal side. The two longitudinally symmetrical parts are the third transverse folding vertical plate, the first transverse folding horizontal plate, the fourth transverse folding vertical plate and the second transverse folding horizontal plate which are sequentially extended inward along the transverse side. There are creases pressed between the plates. A first card hole is opened at the crease between the fourth longitudinal folding vertical plate and the second longitudinal folding horizontal plate. A first card board is extended and arranged at the position of the longitudinal outer frame edge of the first bottom plate corresponding to the first card hole. A second card hole is opened at the crease between the fourth transverse folding vertical plate and the second transverse folding horizontal plate. A second card board is extended and arranged at the position of the transverse outer frame edge of the first bottom plate corresponding to the second card hole. A second hand hole is opened at the crease between the first main lining cover plate and the second plugging plate. A third hand hole is opened at one side edge of the first main lining cover plate.
[0007] A further improvement of the present utility model lies in that: the second main body lining includes a second bottom plate, which is divided into four pairwise symmetrical parts along the four sides of the second bottom plate. Among them, the two longitudinally symmetrical sides of the second bottom plate are sequentially extended with a fifth transverse folding vertical plate, a third transverse folding horizontal plate, a sixth transverse folding vertical plate and a fourth transverse folding horizontal plate. The two transversely symmetrical sides of the second bottom plate are sequentially extended with a fifth longitudinal folding vertical plate, a third longitudinal folding horizontal plate, a sixth longitudinal folding vertical plate and a fourth longitudinal folding horizontal plate. There are creases pressed between the plates. The outer edges of the fourth transverse folding horizontal plate and the fourth longitudinal folding horizontal plate are respectively provided with a first multi-fold support plate and a second multi-fold support plate. Some of the outer edges are provided with an "L" shape. The first multi-fold support plate and the second multi-fold support plate are both divided into two "L" shaped parts by a middle incision. Each part is divided into multiple folded plates by multiple creases. A perspective hole is opened in the middle of the second bottom plate. A key avoidance hole is opened on the sixth longitudinal folding vertical plate. A fourth hand hole is opened at the crease between the third longitudinal folding horizontal plate and the sixth longitudinal folding vertical plate.
[0008] A further improvement of the present utility model lies in that: a fixed connection mechanism is provided between the first main body lining and the second main body lining. The fixed connection mechanism includes a third card hole provided at the indentation of the second bottom plate and the fifth horizontal folding vertical plate, and third cards provided at two sides of the first bottom plate corresponding to the position of the third card hole. The fixed connection mechanism further includes a fourth card hole opened at the indentation between the second bottom plate and the fifth vertical folding vertical plate, and a fourth card provided at the position corresponding to the fourth card hole at the indentation between the fourth vertical folding vertical plate and the second vertical folding horizontal plate. The fixed connection mechanism further includes a first plug-in fixing plate extending from the indentation between the sixth vertical folding vertical plate and the fourth vertical folding horizontal plate, and a first plug-in fixing hole provided at the positions of the second bottom plate, the first bottom plate and the second vertical folding horizontal plate corresponding to the first plug-in fixing plate. The fixed connection mechanism further includes a second plug-in fixing plate extending from the indentation between the sixth horizontal folding vertical plate and the fourth horizontal folding horizontal plate, a second plug-in fixing hole provided at the position of the second bottom plate corresponding to the second plug-in fixing plate, and an avoidance space provided at the position of the first bottom plate corresponding to the second plug-in fixing plate. The waists of the first plug-in fixing plate and the second plug-in fixing plate are both provided with inwardly retracted card slots.
[0009] The present utility model adopts a design scheme of all-paper cards, which can solve the problem of difficult degradation affecting the environment. At the same time, by adopting the folding method of all-paper cards, the cost is further reduced. Moreover, by adopting a lining fixed connection structure, the integrity of the lining is maintained, and the packaged product is better protected. Description of the Drawings
[0010] Figure 1 is a three-dimensional schematic diagram of the packaging box of the present utility model.
[0011] Figure 2 is a schematic diagram of the unfolding and folding of the outer box of the present utility model.
[0012] Figure 3 is an unfolded schematic diagram of the bottom cover lining 20 of the present utility model.
[0013] Figure 4 is a folding schematic diagram of the bottom cover lining 20 of the present utility model.
[0014] Figure 5 is an unfolded schematic diagram of the first main body lining 30 of the present utility model.
[0015] Figure 6 is a folding schematic diagram of the first main body lining 30 of the present utility model.
[0016] Figure 7 is an unfolded schematic diagram of the second main body lining 40 of the present utility model.
[0017] Figure 8 It is one of the folding schematic diagrams of the second main body lining 40 of the present utility model.
[0018] Figure 9 It is the second of the folding schematic diagrams of the second main body lining 40 of the present utility model. Detailed implementation manners
[0019] The specific embodiments of the present utility model will be described with reference to the above-mentioned specification drawings.
[0020] As can be seen from Figures 1 to 9 the full-paper-card transport packaging box for a tablet computer designed by the present utility model includes an outer box 10, a bottom cover lining 20, a first main body lining 30, and a second main body lining 40 that are sequentially stacked inside the outer box 10. The bottom cover lining 20 is a disk body with baffles folded around its perimeter. The first main body lining 30 is a frame with tubular buffer structures around its perimeter. The second main body lining 40 is a disk-shaped structure with tubular buffer structures around its perimeter and a receiving space in the middle. The present utility model uses a full-paper-card folding method to package the tablet computer, which can completely avoid using cushioning materials such as EPS and EPE. On the one hand, it is convenient for degradation. On the other hand, it also reduces the cost of forming cushioning materials. Moreover, by using buffer and compression-resistant structures in all directions, it can fully meet the technical requirements of packaging and also meet the requirements for packaging materials abroad, thereby improving the market acceptance.
[0021] As can be seen from Figure 1 , Figure 3 and Figure 4As can be seen, the inner lining 20 of the bottom cover of the present utility model includes a bottom cover bottom plate 21, a first longitudinal folding vertical plate 22 and a second longitudinal folding vertical plate 23 respectively extending along the two opposite longitudinal sides of the bottom cover bottom plate 21, a first transverse folding vertical plate 24 and a second transverse folding vertical plate 25 respectively extending along the two opposite transverse sides of the bottom cover bottom plate 21. First plug-in plates 26 are respectively extended along the two transverse sides of the first longitudinal folding vertical plate 22. Indentations are pressed between the plates. A first hand hole 27 bridging the two plates is opened at the indentation between the first longitudinal folding vertical plate 22 and the second longitudinal folding vertical plate 23. A first jack 211 is opened at the indentation between the bottom cover bottom plate 21 and the first transverse folding vertical plate 24. A first card 251 is extended on the second transverse folding vertical plate 25 corresponding to the position of the first jack 11. A second jack 212 is opened at the indentation between the bottom cover bottom plate 21 and the first longitudinal folding vertical plate 22. A second card 231 is extended on the second longitudinal folding vertical plate 23 corresponding to the position of the second jack 12. In this solution, the first longitudinal folding vertical plate 22 and the second longitudinal folding vertical plate 23, as well as the first transverse folding vertical plate 24 and the second transverse folding vertical plate 25 are folded relatively to form a double-layer side wall structure. The first plug-in plates 26 are inserted between the first transverse folding vertical plate 24 and the second transverse folding vertical plate 25 and clamped by the two plates to maintain the stable structure among the four side walls. The designed hand hole is for customers to conveniently take the inner items after opening the outer package.
[0022] From Figure 1 , Figure 5 and Figure 6As can be seen, the first main body lining 30 of the present utility model includes a first bottom plate 31, a connecting vertical plate 311, a first main lining cover plate 312, and a second plug-in plate 313 that are sequentially extended along one side of the first bottom plate 31. The middle of the first bottom plate 31 is cut out into four symmetrically arranged parts in pairs. Among them, the two horizontally opposite parts are the third longitudinal folding vertical plate 32, the first longitudinal folding horizontal plate 33, the fourth longitudinal folding vertical plate 34, and the second longitudinal folding horizontal plate 35 that are sequentially extended inward along the longitudinal side. The two longitudinally symmetric parts are the third transverse folding vertical plate 36, the first transverse folding horizontal plate 37, the fourth transverse folding vertical plate 38, and the second transverse folding horizontal plate 39 that are sequentially extended inward along the transverse side. There are indentation marks pressed between each plate. A first card hole 341 is opened at the indentation mark between the fourth longitudinal folding vertical plate 34 and the second longitudinal folding horizontal plate 35. A first card plate 314 is extended at the position of the longitudinal outer frame edge of the first bottom plate 31 corresponding to the first card hole 341. A second card hole 381 is opened at the indentation mark between the fourth transverse folding vertical plate 38 and the second transverse folding horizontal plate 39. A second card plate 315 is extended at the position of the transverse outer frame edge of the first bottom plate 31 corresponding to the second card hole 381. A second hand hole 316 is opened at the indentation mark between the first main lining cover plate 312 and the second plug-in plate 313. A third hand hole 317 is opened at one side edge of the first main lining cover plate 312. In the first lining structure of this solution, the third longitudinal folding vertical plate 32, the first longitudinal folding horizontal plate 33, the fourth longitudinal folding vertical plate 34, and the second longitudinal folding horizontal plate 35 are folded downward to form a longitudinal square tube support structure B. After folding, the second longitudinal folding horizontal plate 35 fits with the first bottom plate 31. The third transverse folding vertical plate 36, the first transverse folding horizontal plate 37, the fourth transverse folding vertical plate 38, and the second transverse folding horizontal plate 39 are also folded downward to form a transverse square tube structure A. After folding, the second transverse folding horizontal plate 39 fits with the first bottom plate 31. The first card plate 314 is inserted into the first card hole 341 and the second card plate 315 is inserted into the second card hole 381 to ensure the structural stability of the square tube structures A and B. The designed second hand hole 316 and third hand hole 317 are also for the convenience of taking and placing the packaged items.
[0023] From Figure 1 , Figures 7 to 9As can be seen, the second main body lining 40 includes a second bottom plate 41, which is symmetrically divided into four parts in pairs along the four sides of the second bottom plate 41. Among them, two longitudinally symmetrical sides of the second bottom plate 41 are successively extended with a fifth transverse folding vertical plate 42, a third transverse folding horizontal plate 43, a sixth transverse folding vertical plate 44, and a fourth transverse folding horizontal plate 45. Two laterally symmetrical sides of the second bottom plate 41 are successively extended with a fifth longitudinal folding vertical plate 46, a third longitudinal folding horizontal plate 47, a sixth longitudinal folding vertical plate 48, and a fourth longitudinal folding horizontal plate 49. Indentations are pressed between the plates. The outer edges of the fourth transverse folding horizontal plate 45 and the fourth longitudinal folding horizontal plate 49 are respectively provided with a first multi-fold support plate 451 and a second multi-fold support plate 491. Some of the outer edges are provided with an "L" shape. Both the first multi-fold support plate 451 and the second multi-fold support plate 491 are divided into two "L" shaped parts by a middle incision, and each part is divided into multiple folded plate segments by multiple indentations. A perspective hole 411 is opened in the middle of the second bottom plate 41. A key avoidance hole 481 is opened on the sixth longitudinal folding vertical plate 48. A fourth hand hole 482 is opened at the indentation between the third longitudinal folding horizontal plate 47 and the sixth longitudinal folding vertical plate 48. In this solution, the fifth transverse folding vertical plate 42, the third transverse folding horizontal plate 43, the sixth transverse folding vertical plate 44, and the fourth transverse folding horizontal plate 45 are folded and rolled into a transverse square tube structure C. The fifth longitudinal folding vertical plate 46, the third longitudinal folding horizontal plate 47, the sixth longitudinal folding vertical plate 48, and the fourth longitudinal folding horizontal plate 49 are folded and rolled into a longitudinal square tube structure D. The first multi-fold support plate 451 is repeatedly folded to form a solid support structure E, which is wrapped in the middle by the square tube C to form a support. The second multi-fold support plate 491 is also repeatedly folded into a solid support structure F, which is also wrapped by the square tube structure D to form a support structure. In the present utility model, the first multi-fold support plate 451 and the second multi-fold support plate 491 are cut from the middle to form two parts, thus avoiding the defect of inconvenient folding due to too long square tubes. The perspective hole 411 mainly provides conditions for customers to see the items below the lining plate, such as the charging cable, plug, and instruction manual in the accessories, etc. The design of the key avoidance hole 481 is used to avoid the protruding keys on the tablet, so as not to press the keys and affect the product life. The hand hole is also for the convenience of taking and placing the product, etc.
[0024] From Figure 1 , Figures 5 to 9As can be seen, a fixed connection mechanism 50 is provided between the first main body lining 30 and the second main body lining 40 of the present utility model. The fixed connection mechanism 50 includes a third card hole 51 provided at the indentation of the second bottom plate 41 and the fifth transverse folding vertical plate 42, and third cards 52 provided at two sides of the first bottom plate 31 corresponding to the position of the third card hole 51. The fixed connection mechanism 50 further includes a fourth card hole 53 opened at the indentation between the second bottom plate 41 and the fifth longitudinal folding vertical plate 46, and fourth cards 54 provided at the position corresponding to the fourth card hole 53 at the indentation of the fourth longitudinal folding vertical plate 34 and the second longitudinal folding horizontal plate 35. The fixed connection mechanism 50 further includes a first plug-in fixing plate 55 extending from the indentation between the sixth longitudinal folding vertical plate 48 and the fourth longitudinal folding horizontal plate 49, and first plug-in fixing holes 56 provided on the second bottom plate 41, the first bottom plate 31 and the second longitudinal folding horizontal plate 35 corresponding to the position of the first plug-in fixing plate 55. The fixed connection mechanism 50 further includes a second plug-in fixing plate 57 extending from the indentation between the sixth transverse folding vertical plate 44 and the fourth transverse folding horizontal plate 45, a second plug-in fixing hole 58 provided on the second bottom plate 41 corresponding to the position of the second plug-in fixing plate 57, and an avoidance space provided on the first bottom plate 31 corresponding to the position of the second plug-in fixing plate 57. The waists of the first plug-in fixing plate 55 and the second plug-in fixing plate 57 are both provided with inwardly retracted card slots 551. The fixed connection mechanism 50 in the present utility model is mainly used for the fixed connection between the first main body lining 30 and the second main body lining 40. When the second main body lining 40 is stacked on the first main body lining 30, the third cards 52 are inserted into the third card holes 51 and the fourth cards 54 are inserted into the fourth card holes 53, then the second main body lining 40 and the first main body lining 30 are buckled into one body. Further, the first plug-in fixing plate 55 is inserted into the first plug-in fixing hole 56 and the second plug-in fixing plate 57 is inserted into the second plug-in fixing hole 58 to form a fixed structure. Since the waists of the first plug-in fixing plate 55 and the second plug-in fixing plate 57 are both provided with inwardly retracted card slots 551, the problems of stable plug-in and non-loosening are achieved.
[0025] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, which should all be regarded as belonging to the protection scope of the present invention.
Claims
1. A full-paper-card transportation packaging box for a tablet computer, characterized in that: The transport packaging box includes an outer box (10), a bottom cover lining (20), a first main body lining (30), and a second main body lining (40) that are arranged inside the outer box (10) and stacked in sequence. The bottom cover lining (20) is a tray with baffles folded around its perimeter. The first main body lining (30) is a frame with tubular buffer structures around its perimeter. The second main body lining (40) is a tray-shaped structure with tubular buffer structures around its perimeter and a receiving space in the middle.
2. The full-paper-card transport packaging box for a tablet computer according to claim 1, wherein: The bottom cover lining (20) includes a bottom cover bottom plate (21), a first longitudinal folding vertical plate (22) and a second longitudinal folding vertical plate (23) that are respectively extended and arranged along the two opposite longitudinal sides of the bottom cover bottom plate (21), a first transverse folding vertical plate (24) and a second transverse folding vertical plate (25) that are respectively extended and arranged along the two opposite transverse sides of the bottom cover bottom plate (21), and first plug-in plates (26) that are respectively extended and arranged along the two transverse sides of the first longitudinal folding vertical plate (22). There are creases pressed between the plates.
3. The full-paper-card transportation packaging box for a tablet computer according to claim 2, characterized in that: A first hand hole (27) that spans the two plates is opened at the crease between the first longitudinal folding vertical plate (22) and the second longitudinal folding vertical plate (23).
4. The full paper card transport packaging box for a tablet computer according to claim 2, wherein: A first jack (211) is opened at the crease between the bottom cover bottom plate (21) and the first transverse folding vertical plate (24). A first card (251) is extended and arranged at the position corresponding to the first jack (211) on the second transverse folding vertical plate (25). A second jack (212) is opened at the crease between the bottom cover bottom plate (21) and the first longitudinal folding vertical plate (22). A second card (231) is extended and arranged at the position corresponding to the second jack (212) on the second longitudinal folding vertical plate (23).
5. The full-paper card transport packaging box for a tablet computer according to any one of claims 1 to 4, characterized in that: The first main body lining (30) includes a first bottom plate (31), a connecting vertical plate (311), a first main lining cover plate (312), and a second plug-in plate (313) that are sequentially extended and arranged along one side of the first bottom plate (31). The middle of the first bottom plate (31) is cut into four pairwise symmetric parts. Among them, the two horizontally opposite parts are a third longitudinal folding vertical plate (32), a first longitudinal folding horizontal plate (33), a fourth longitudinal folding vertical plate (34), and a second longitudinal folding horizontal plate (35) that are sequentially extended and arranged along the longitudinal sides inward. The two vertically symmetric parts are a third transverse folding vertical plate (36), a first transverse folding horizontal plate (37), a fourth transverse folding vertical plate (38), and a second transverse folding horizontal plate (39) that are sequentially extended and arranged along the transverse sides inward. There are creases pressed between the plates.
6. The full-paper-card transportation packaging box for a tablet computer according to claim 5, wherein: A first card hole (341) is opened at the crease between the fourth longitudinal folding vertical plate (34) and the second longitudinal folding horizontal plate (35). A first card plate (314) is extended and arranged at the position corresponding to the first card hole (341) on the longitudinal outer frame edge of the first bottom plate (31). A second card hole (381) is opened at the crease between the fourth transverse folding vertical plate (38) and the second transverse folding horizontal plate (39). A second card plate (315) is extended and arranged at the position corresponding to the second card hole (381) on the transverse outer frame edge of the first bottom plate (31).
7. The full-paper card transport packaging box for a tablet computer according to claim 5, wherein: A second hand hole (316) is formed at the indentation between the first main lining cover plate (312) and the second plug-in board (313), and a third hand hole (317) is formed at one side edge of the first main lining cover plate (312).
8. The full-paper-card transportation packaging box for a tablet computer according to claim 5, wherein: The second main body inner lining (40) includes a second bottom plate (41), which is symmetrically divided into four parts in pairs along the four sides of the second bottom plate (41). Among them, two longitudinally symmetric sides of the second bottom plate (41) are sequentially extended with a fifth transverse folding vertical plate (42), a third transverse folding horizontal plate (43), a sixth transverse folding vertical plate (44), and a fourth transverse folding horizontal plate (45). Two transversely symmetric sides of the second bottom plate (41) are sequentially extended with a fifth longitudinal folding vertical plate (46), a third longitudinal folding horizontal plate (47), a sixth longitudinal folding vertical plate (48), and a fourth longitudinal folding horizontal plate (49). Indentations are pressed between the plates. The outer edges of the fourth transverse folding horizontal plate (45) and the fourth longitudinal folding horizontal plate (49) are respectively provided with a first multi-fold support plate (451) and a second multi-fold support plate (491). Some of the outer edges are provided with an "L" shape. Both the first multi-fold support plate (451) and the second multi-fold support plate (491) are divided into two "L"-shaped parts by a middle incision, and each part is divided into multiple folded plates by multiple indentations.
9. The full-paper-card transport packaging box for a tablet computer according to claim 8, wherein: A perspective hole (411) is formed in the middle of the second bottom plate (41), a key avoidance hole (481) is formed on the sixth longitudinal folding vertical plate (48), and a fourth hand hole (482) is formed at the indentation between the third longitudinal folding horizontal plate (47) and the sixth longitudinal folding vertical plate (48).
10. The full paper card transport packaging box for a tablet computer according to claim 8, characterized in that: A fixed connection mechanism (50) is provided between the first main body lining (30) and the second main body lining (40). The fixed connection mechanism (50) includes a third card hole (51) provided at the indentation between the second bottom plate (41) and the fifth transverse folding vertical plate (42), and third cards (52) provided at two sides of the first bottom plate (31) corresponding to the position of the third card hole (51). The fixed connection mechanism (50) further includes a fourth card hole (53) opened at the indentation between the second bottom plate (41) and the fifth longitudinal folding vertical plate (46), and fourth cards (54) provided at the position corresponding to the fourth card hole (53) at the indentation between the fourth longitudinal folding vertical plate (34) and the second longitudinal folding horizontal plate (35). The fixed connection mechanism (50) further includes a first plugging and fixing plate (55) extending from the indentation between the sixth longitudinal folding vertical plate (48) and the fourth longitudinal folding horizontal plate (49), and first plugging and fixing holes (56) provided on the second bottom plate (41), the first bottom plate (31), and the second longitudinal folding horizontal plate (35) corresponding to the position of the first plugging and fixing plate (55). The fixed connection mechanism (50) further includes a second plugging and fixing plate (57) extending from the indentation between the sixth transverse folding vertical plate (44) and the fourth transverse folding horizontal plate (45), a second plugging and fixing hole (58) provided on the second bottom plate (41) corresponding to the position of the second plugging and fixing plate (57), and an avoidance space provided on the first bottom plate (31) corresponding to the position of the second plugging and fixing plate (57). The waists of the first plugging and fixing plate (55) and the second plugging and fixing plate (57) are both provided with inwardly retracted card slots (551).