A carton

Abstract

This utility model discloses a paper box, belonging to the field of paper boxes. The paper box includes a box body, a box lid, a box bottom, a partition, and a first insert plate. The box body has a box lid at the top and a box bottom at the bottom. The box body includes a first side panel, a second side panel, a third side panel, a fourth side panel, and an extension plate connected sequentially from left to right. The connections between the first and second side panels, the second and third side panels, the third and fourth side panels, and the fourth side panel and the extension plate all have first fold lines. The first, second, third, and fourth side panels, along with the extension plate, form the box body. The extension plate is located inside the first side panel and is adhered to or engaged with it. A partition is fixed to the inner wall of the second side panel, and the right end of the partition is connected to the first insert plate. The fourth side panel has a first locking hole for the first insert plate to pass through. This utility model can automatically switch between a divided and a stored state.

Description

Technical Field

[0001] This utility model belongs to the field of paper boxes, and in particular relates to a paper box. Background Technology

[0002] Cardboard boxes are widely used for the storage and transportation of various products, including food, daily necessities, and electronic products, due to their advantages such as low cost, ease of processing, and recyclability. Currently, most cardboard boxes on the market are one-piece molded structures, mainly composed of a box body, a lid, and a bottom. Their internal space is usually a single cavity, which can only accommodate the product as a whole and cannot meet the needs of classified storage of products of different sizes or types.

[0003] To address the issue of categorized storage, some existing cardboard boxes are equipped with individual dividers. These dividers are inserted into pre-set slots or grooves within the box to create spatial separation. However, this design has significant drawbacks: firstly, the individual dividers are separate from the box body and are easily lost during production, transportation, and use, preventing users from properly achieving the spatial separation function; secondly, the stability of the divider's fit with the slot is poor. When the box is handled or subjected to external impact, the divider is prone to displacement or detachment, failing to maintain spatial separation and potentially causing products inside the box to be squeezed and collide, affecting product integrity.

[0004] Some cardboard boxes use a fixed partition structure, where partitions are integrally formed during the box body molding process, permanently dividing the internal space into at least two areas. However, this design has extremely low flexibility; once the box is formed, the partitions cannot be removed, and the number of areas the internal space is divided into is fixed during molding, for example, fixed as two areas, front and back, which cannot meet the needs of users who do not require partitions. Utility Model Content

[0005] The purpose of this invention is to provide a paper box that overcomes at least one of the aforementioned defects in the prior art.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This utility model provides a paper box, including a box body, a box lid, a box bottom, a partition, and a first insert plate. The box body has a box lid at the top and a box bottom at the bottom. The box body includes a first side plate, a second side plate, a third side plate, a fourth side plate, and an extension plate connected sequentially from left to right. The connection points between the first and second side plates, the second and third side plates, the third and fourth side plates, and the fourth side plate and the extension plate all have a first fold line. The first, second, third, and fourth side plates and the extension plate form the box body. The extension plate is located inside the first side plate and is glued or snapped onto the first side plate. A partition is fixed to the inner wall of the second side plate, and the right end of the partition is connected to the first insert plate. The fourth side plate has a first locking hole for the first insert plate to pass through.

[0008] Preferably, the box bottom includes a first bottom plate, a second bottom plate, a third bottom plate, and a fourth bottom plate. The bottom of the first side plate is connected to the first bottom plate, the bottom of the second side plate is connected to the second bottom plate, the bottom of the third side plate is connected to the third bottom plate, and the bottom of the fourth side plate is connected to the fourth bottom plate. The connection points between the first side plate and the first bottom plate, the second side plate and the second bottom plate, the third side plate and the third bottom plate, and the fourth side plate and the fourth bottom plate all have second fold lines. The top of the second bottom plate is bonded to the first bottom plate, the third bottom plate, and the fourth bottom plate, the top of the first bottom plate is bonded to the fourth bottom plate, and the top of the fourth bottom plate is bonded to the third bottom plate.

[0009] Preferably, the lid includes a first cover plate, a second cover plate, a third cover plate, and a fourth cover plate. The top of the first side plate is connected to the first cover plate, the top of the second side plate is connected to the second cover plate, the top of the third side plate is connected to the third cover plate, and the top of the fourth side plate is connected to the fourth cover plate. The connection points between the first side plate and the first cover plate, the second side plate and the second cover plate, the third side plate and the third cover plate, and the fourth side plate and the fourth cover plate all have a third fold line. The top of the first cover plate has a first locking part, and the top of the third cover plate has a second locking part that cooperates with the first locking part.

[0010] Preferably, the partition includes a connecting part and a plate body. The plate body is fixed to the second side plate through the connecting part. The connection between the connecting part and the plate body has a fourth fold line. The right end of the plate body is connected to a first insert plate. The connection between the first insert plate and the plate body has a fifth fold line.

[0011] Preferably, the third side plate has a second locking hole through which the first insert plate passes.

[0012] Preferably, the plate has a sixth fold line extending along its height direction, which divides the plate into left and right parts.

[0013] Preferably, the plate also has a seventh fold line extending along its length, which divides the plate into upper and lower parts, and the top of the connecting part and the first insert plate are flush with or below the seventh fold line.

[0014] Preferably, a second insert plate is connected to the top of the plate, and the first side plate has a third slot for the second insert plate to pass through.

[0015] Preferably, the second insert has an eighth fold line extending along its height direction, the eighth fold line connecting with the seventh fold line, and a ninth fold line at the connection between the second insert and the plate body.

[0016] Preferably, the inner wall of the first side plate has a third locking portion that engages with the extension plate.

[0017] Preferably, the box body, box lid, box bottom, partition, first insert plate, and second insert plate are all made of coated kraft paper.

[0018] The beneficial effects of this utility model are as follows:

[0019] 1. Adopting an integrated molding design, it can be laid flat before assembly for easy transportation and to save space. During assembly, it can be completed by folding and bonding. One end of the partition is fixed to prevent loss, while the other end is free, which can realize the conversion between the separation and storage states. Stable separation is achieved by the first insert plate engaging with the first card hole. It can meet the needs of multi-category classification and storage, and is also suitable for single large product storage.

[0020] 2. The bottom of the box is formed by four base plates that are cross-bonded in multiple layers to form a composite structure, which significantly improves the overall thickness and structural strength to withstand greater vertical pressure and avoid deformation and damage caused by heavy objects. In addition, each base plate and side plate is pre-connected, and can be assembled simply by folding and bonding in a preset order, which reduces the complexity of production and use.

[0021] 3. The lid is locked by folding four cover plates along the third fold line and interlocking the locking parts of the first and third cover plates. This simplifies the closing operation and improves ease of use. The four cover plates work together to enhance the sealing and stability of the lid, effectively preventing the lid from opening on its own during transport and ensuring the safety of the contents.

[0022] 4. When no separation is needed, the partition can be folded and attached to the second and third side panels, and can be compactly stored by limiting the first insert plate. When separation is needed, it can be flexibly unfolded and different separation widths can be switched by the sixth fold line and double card holes, and the space ratio can be dynamically adjusted. It does not take up extra space and greatly improves the utilization rate of the internal space of the cardboard box.

[0023] 5. The partition can be folded along the seventh fold line to form a shorter partition and limited by the second insert plate, which meets the needs of separating low-height items and avoids wasting space. At the same time, the sixth fold line combined with the seventh fold line allows the partition to be adjusted vertically and horizontally in two dimensions, which can accurately separate items of different sizes and solve the limitations of the fixed height and width of traditional partitions. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the main structure of Embodiment 1 of this utility model (first separation state).

[0025] Figure 2 This is a top view of the box body, box bottom, partition, and first insert plate of Embodiment 1 of this utility model (first partition state).

[0026] Figure 3 This is a schematic diagram of the unfolded structure of Embodiment 1 of this utility model.

[0027] Figure 4 This is a top view of the structure of Embodiment 1 of this utility model (with the cover closed).

[0028] Figure 5 This is a schematic diagram of the main structure of the partition and the first insert plate in Embodiment 1 of this utility model.

[0029] Figure 6 This is a top view of the box body, box bottom, partition, and first insert plate of Embodiment 1 of this utility model (second partition state).

[0030] Figure 7 This is a schematic diagram of the main structure of Embodiment 1 of this utility model (second separation state).

[0031] Figure 8 This is a schematic diagram of the unfolded structure of Embodiment 2 of this utility model.

[0032] The labels in the attached diagram are as follows: 1-Box body, 2-Box lid, 3-Box bottom, 4-Divider, 5-First insert plate, 11-First side plate, 12-Second side plate, 13-Third side plate, 14-Fourth side plate, 15-Extension plate, 16-First fold line, 17-First card hole, 31-First bottom plate, 32-Second bottom plate, 33-Third bottom plate, 34-Fourth bottom plate, 35-Second fold line, 21-First cover plate, 22-... - Second cover plate, 23- Third cover plate, 24- Fourth cover plate, 25- Third fold line, 26- First locking part, 27- Second locking part, 41- Connecting part, 42- Plate body, 43- Fourth fold line, 44- Fifth fold line, 18- Second locking hole, 45- Sixth fold line, 46- Seventh fold line, 47- Second insert plate, 19- Third locking hole, 48- Eighth fold line, 49- Ninth fold line, 110- Third locking part. Detailed Implementation

[0033] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0034] Contents not described in detail in this specification are existing technologies known to those skilled in the art. In the description of this utility model, it should be understood that terms such as "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this utility model and simplifying the description. They 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 utility model. Furthermore, terms such as "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] Example 1:

[0036] like Figures 1 to 7 As shown, a paper box provided in this embodiment includes a box body 1, a box lid 2, a box bottom 3, a partition 4, and a first insert plate 5. The box body 1 has a box lid on top and a box bottom 3 on the bottom. The box body 1 includes a first side plate 11, a second side plate 12, a third side plate 13, a fourth side plate 14, and an extension plate 15 connected sequentially from left to right. The connection points of the first side plate 11 and the second side plate 12, the second side plate 12 and the third side plate 13, and the third side plate 13 and the fourth side plate 14 are shown in the figure. The connection points of side plate 14 and the connection points of the fourth side plate 14 and the extension plate 15 both have a first fold line 16. The first side plate 11, the second side plate 12, the third side plate 13, the fourth side plate 14, and the extension plate 15 form a box body 1. The extension plate 15 is located inside the first side plate 11 and is glued or snapped to the first side plate 11. The inner side wall of the second side plate 12 is fixed with a partition 4. The right end of the partition 4 is connected to a first insert plate 5. The fourth side plate 14 has a first snap hole 17 for the first insert plate 5 to pass through.

[0037] The box body 1, lid 2, bottom 3, and first insert plate 5 of this utility model adopt an integrated molding design. During the production stage, the partition plate 4 is already glued to the second side plate 12. Subsequent assembly only requires folding along the corresponding fold lines. Before assembly, the entire box is laid flat, facilitating transportation and saving space. During assembly, firstly, the first side plate 11, second side plate 12, third side plate 13, fourth side plate 14, and extension plate 15 of the box body 1 are folded along the first fold line 16, so that the four side plates sequentially enclose to form the frame of the box body 1. Then, the extension plate 15 is attached to the inside of the first side plate 11. In this embodiment, it is fixed by adhesive, ensuring the structural stability of the box body 1 and preventing loosening or deformation after assembly. Finally, the lid 2 and bottom 3 are folded and assembled according to usage requirements to form a complete and usable box.

[0038] When it is necessary to divide the internal space of the cardboard box, since the partition 4 is pre-fixed to the inner wall of the second side panel 12, there is no need to find or install an independent partition 4. The user only needs to manually pull the free end of the partition 4 (the end closest to the fourth side panel 14). At this time, the first insert 5 connected to the right end of the partition 4 will move towards the fourth side panel 14 in sync with the movement of the partition 4 until the first insert 5 is aligned with the first latching hole 17 on the fourth side panel 14. Then, the first insert 5 is passed through the first latching hole 17 and bent forward or backward to form a locking state. At this time, the partition 4 is stably fixed inside the box body 1, dividing the inside of the cardboard box into two independent spaces to achieve the function of classified storage. If the space does not need to be divided later, simply straighten the first insert 5, pull the partition 4 in the opposite direction to disengage the first insert from the first latching hole 17, and then retract the partition 4 to the inside of the second side panel 12 and the third side panel 13. The operation is flexible and convenient.

[0039] Compared to existing designs where the independent partition 4 is separate from the carton body, in this invention, the partition 4 is directly fixed to the inner wall of the second side plate 12, becoming part of the integrated carton structure. During production, transportation, and use, the partition 4 will not separate from the carton, fundamentally avoiding the problem of partition 4 being lost. This ensures that users can easily partition space as needed without requiring additional partition 4 components. Through the engaging structure of the first insert plate 5 and the first latching hole 17, after the partition 4 completes its partitioning operation, the first insert plate 5 passes through the first latching hole 17 to form a secure fixation, effectively limiting the horizontal and vertical displacement of the partition 4. Even if the carton is subjected to external force collisions or tilting during handling, the partition 4 can maintain a stable partitioning state, preventing the products inside the box from being squeezed or collided due to partition 4 displacement, ensuring product storage safety, and solving the problem of poor stability in existing partitioning structures. This adjustable partitioning design breaks the limitations of existing fixed-partition cartons, meeting the classification and storage needs of multiple product categories as well as adapting to the storage scenarios of single large products, significantly broadening its applicability.

[0040] The box bottom 3 includes a first bottom plate 31, a second bottom plate 32, a third bottom plate 33, and a fourth bottom plate 34. The bottom of the first side plate 11 is connected to the first bottom plate 31, the bottom of the second side plate 12 is connected to the second bottom plate 32, the bottom of the third side plate 13 is connected to the third bottom plate 33, and the bottom of the fourth side plate 14 is connected to the fourth bottom plate 34. The connection points between the first side plate 11 and the first bottom plate 31, the second side plate 12 and the second bottom plate 32, the third side plate 13 and the third bottom plate 33, and the fourth side plate 14 and the fourth bottom plate 34 all have a second fold line 35. The top of the second bottom plate 32 is bonded to the first bottom plate 31, the third bottom plate 33, and the fourth bottom plate 34. The top of the first bottom plate 31 is bonded to the fourth bottom plate 34, and the top of the fourth bottom plate 34 is bonded to the third bottom plate 33.

[0041] Along the second fold line 35, the first base plate 31, the second base plate 32, the third base plate 33, and the fourth base plate 34 are folded inwards towards the box body 1, changing each base plate from a state perpendicular to the side plates to a horizontal state, forming the basic frame of the box bottom 3. After folding, each base plate is glued and fixed in a specific order. Through this multi-layer cross-bonding method, the four base plates restrain each other and are tightly connected, ultimately forming a structurally stable box bottom 3. The multi-layer base plates form a composite structure through cross-bonding. Compared with the design of a single base plate or a simply overlapping box bottom 3, its overall thickness and structural strength are significantly improved, and it can withstand greater vertical pressure, effectively avoiding the problem of deformation or damage to the box bottom 3 due to the weight of the items inside the box. Furthermore, each base plate of the box bottom 3 is pre-connected to the corresponding side plate, eliminating the need for additional independent bottom components. Assembly can be completed simply by folding and a preset bonding sequence, reducing the operational complexity during production and use.

[0042] The box cover includes a first cover plate 21, a second cover plate 22, a third cover plate 23, and a fourth cover plate 24. The top of the first side plate 11 is connected to the first cover plate 21, the top of the second side plate 12 is connected to the second cover plate 22, the top of the third side plate 13 is connected to the third cover plate 23, and the top of the fourth side plate 14 is connected to the fourth cover plate 24. The connection between the first side plate 11 and the first cover plate 21, the connection between the second side plate 12 and the second cover plate 22, the connection between the third side plate 13 and the third cover plate 23, and the connection between the fourth side plate 14 and the fourth cover plate 24 all have a third fold line 25. The top of the first cover plate 21 has a first locking part 26, and the top of the third cover plate 23 has a second locking part 27 that cooperates with the first locking part 26.

[0043] When the carton needs to be closed, first fold the first cover plate 21, the second cover plate 22, the third cover plate 23, and the fourth cover plate 24 towards the top center of the carton body 1 along the third fold line 25 until all the cover plates are horizontal, initially covering the top opening of the carton body 1. After completing the horizontal folding of the four cover plates, the key operation is the engagement of the first cover plate 21 and the third cover plate 23: since the first cover plate 21 has a first locking part 26 on its top, and the third cover plate 23 has a second locking part 27 that matches the first locking part 26 on its top, simply push the first cover plate 21 and the third cover plate 23 gently to make the first locking part 26 and the second locking part 27 interlock, thus locking and fixing the lid. At this time, the second cover plate 22 and the fourth cover plate 24 are sandwiched between the first cover plate 21 and the third cover plate 23, further enhancing the overall stability of the lid and preventing the lid from opening on its own during transportation. The lid 2 of this carton simplifies the closing operation, improves the convenience of use, and enhances the sealing and stability of the lid to ensure the safety of the contents.

[0044] The partition 4 includes a connecting part 41 and a plate 42. The plate 42 is fixed to the second side plate 12 via the connecting part 41. The connection between the connecting part 41 and the plate 42 has a fourth fold line 43. A first insert plate 5 is connected to the right end of the plate 42. The connection between the first insert plate 5 and the plate 42 has a fifth fold line 44. The third side plate 13 has a second locking hole 18 for the first insert plate 5 to pass through. The plate 42 has a sixth fold line 45 extending along its height direction, which divides the plate 42 into left and right parts.

[0045] When no separation is needed, the left part of panel 42 is folded along the fourth fold line 43 and attached to the second side panel 12, and the right part of panel 42 is folded and attached to the third side panel 13. Then, the first insert plate 5 is passed through the second latch 18. After passing through the second latch 18, the first insert plate 5 can be bent along the fifth fold line 44 to limit the panel 42, so that panel 42 is tightly attached to the second side panel 12 and the third side panel 13, resulting in a small overall storage space. When separation is needed, first straighten the first insert plate 5, then push panel 42 back so that the first insert plate 5 disengages from the second latch 18. Unfold panel 42 to a horizontal state and insert the first insert plate 5 into the first latch. If it is necessary to further reduce the space on one side, panel 42 can be folded into left and right parts along the sixth fold line 45 of panel 42 itself to shorten the effective separation length. Then, the first insert plate 5 is passed through the second latch 18 of the third side panel 13 to achieve a more precise space division.

[0046] By combining the folding function of the sixth fold line 45 of the board body 42 with the double card holes, different partition widths can be flexibly switched. The folded board body 42 can adapt to smaller partition requirements. With different card hole positions, the proportion of space on both sides can be dynamically adjusted according to the size of the item, thereby improving the utilization rate of the internal space of the cardboard box.

[0047] The plate 42 also has a seventh fold line 46 extending along its length, which divides the plate 42 into upper and lower parts. The tops of the connecting part 41 and the first insert plate 5 are flush with or below the seventh fold line 46. A second insert plate 47 is connected to the top of the plate 42, and the first side plate 11 has a third locking hole 19 for the second insert plate 47 to pass through. The second insert plate 47 has an eighth fold line 48 extending along its height, which connects to the seventh fold line 46. A ninth fold line 49 is present at the connection between the second insert plate 47 and the plate 42.

[0048] As needed, the upper half of the plate 42 can be folded downwards along the seventh fold line 46 (because the seventh fold line 46 divides the plate 42 into upper and lower parts, and the connecting part 41 and the top of the first insert 5 do not exceed the seventh fold line 46, so they will not be obstructed during folding), shortening the overall height of the partition 4 to the position of the seventh fold line 46, forming a shorter partition 4. Then, the second insert 47 is passed through the third latch 19, and the second insert 47 is bent upwards or downwards along the ninth fold line 49 to limit the plate 42, satisfying the need for separating low-height items while avoiding the partition 4 being too high and wasting space. When storing the partition 4, the second insert 47 can be bent downwards along the ninth fold line 49 to avoid being exposed on the box body 1, and the eighth fold line 48 cooperates with the seventh fold line 46 to ensure that the second insert 47 bends along with the plate 42 when it is bent.

[0049] The addition of the seventh fold line 46 upgrades the partition 4 from a structure that can only be adjusted by folding left and right to a dual-dimensional adjustment structure that can be adjusted vertically and horizontally. Whether it is a short, flat item or a tall, three-dimensional item, the height of the partition 4 can be adjusted by folding the seventh fold line 46, and the width can be adjusted by using the fifth fold line 44 and the double locking holes. This allows for precise separation of items of different sizes and specifications, completely solving the limitation of traditional partition 4 that can only fix the height and width.

[0050] The box body 1, box lid 2, box bottom 3, partition 4, first insert 5, and second insert 47 are all made of laminated kraft paper. This retains the high strength and foldability of kraft paper, ensuring the box's load-bearing capacity and structural stability, while the lamination layer enhances its waterproof and moisture-proof performance, better protecting the contents. Furthermore, the material is environmentally friendly and recyclable, aligning with the trend of green packaging.

[0051] Example 2:

[0052] like Figure 8 As shown, the difference between this embodiment and Embodiment 1 is that:

[0053] The inner wall of the first side panel 11 has a third latching part 110 that engages with the extension plate 15. The box body 1 is fixed by the engagement of the extension plate 15 with the third latching part 110. No glue is needed for bonding and curing; during assembly, the box body 1 can be fixed simply by aligning the extension plate 15 with the third latching part 110, which greatly shortens the assembly time.

[0054] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A cardboard box, characterized in that: Includes the box body, box lid, box bottom, partitions, and first insert plate; The top of the box is provided with a lid, and the bottom of the box is provided with a bottom. The box body includes a first side panel, a second side panel, a third side panel, a fourth side panel, and an extension panel connected sequentially from left to right; The first fold line is present at the connection between the first side plate and the second side plate, the connection between the second side plate and the third side plate, the connection between the third side plate and the fourth side plate, and the connection between the fourth side plate and the extension plate. The first side panel, the second side panel, the third side panel, the fourth side panel, and the extension plate form the box body. The extension plate is located inside the first side panel and is bonded or snapped onto the first side panel. The inner wall of the second side plate is fixed with a partition, and the right end of the partition is connected to a first insert plate. The fourth side plate has a first locking hole through which the first insert plate passes.

2. The cardboard box according to claim 1, characterized in that: The bottom of the box includes a first bottom plate, a second bottom plate, a third bottom plate, and a fourth bottom plate; The bottom of the first side plate is connected to the first base plate; The bottom of the second side plate is connected to a second base plate; The bottom of the third side plate is connected to a third base plate; The bottom of the fourth side plate is connected to the fourth base plate; The connection points of the first side plate and the first bottom plate, the second side plate and the second bottom plate, the third side plate and the third bottom plate, and the fourth side plate and the fourth bottom plate all have a second fold line; The top of the second base plate is bonded with the first base plate, the third base plate, and the fourth base plate; A fourth base plate is bonded to the top of the first base plate; The third base plate is bonded to the top of the fourth base plate.

3. The cardboard box according to claim 1, characterized in that: The box cover includes a first cover plate, a second cover plate, a third cover plate, and a fourth cover plate; A first cover plate is connected to the top of the first side plate; A second cover plate is connected to the top of the second side plate; The top of the third side plate is connected to a third cover plate; The top of the fourth side plate is connected to a fourth cover plate; The connection points of the first side plate and the first cover plate, the connection points of the second side plate and the second cover plate, the connection points of the third side plate and the third cover plate, and the connection points of the fourth side plate and the fourth cover plate all have a third fold line; The top of the first cover plate has a first locking portion, and the top of the third cover plate has a second locking portion that cooperates with the first locking portion.

4. The cardboard box according to claim 1, characterized in that: The partition includes a connecting part and a plate body; The plate is fixed to the second side plate by a connecting part; The connection between the connecting part and the plate has a fourth fold line; The right end of the plate is connected to a first insert plate, and the connection between the first insert plate and the plate has a fifth fold line.

5. The cardboard box according to claim 4, characterized in that: The third side plate has a second slot through which the first insert plate passes.

6. The cardboard box according to claim 4, characterized in that: The plate has a sixth fold line extending along its height direction; The sixth fold line divides the plate into left and right parts.

7. The cardboard box according to claim 6, characterized in that: The plate also has a seventh fold line extending along its length; The seventh fold line divides the plate into upper and lower parts; The top of both the connecting part and the first insert plate are flush with or below the seventh fold line.

8. The cardboard box according to claim 7, characterized in that: The top of the plate is connected to a second insert plate, and the first side plate has a third slot for the second insert plate to pass through. The second insert has an eighth fold line extending along its height direction, the eighth fold line being connected to the seventh fold line; The connection between the second insert plate and the plate body has a ninth fold line.

9. The cardboard box according to claim 1, characterized in that: The inner wall of the first side plate has a third locking portion that engages with the extension plate.

10. The cardboard box according to claim 1, characterized in that: The box body, lid, bottom, partition, first insert, and second insert are all made of laminated kraft paper.

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