Folding box

Abstract

The utility model provides a folding box. The folding box comprises two side plates, a first side plate split body is provided with a locking structure, the locking structure comprises a lock body and an elastic structure, the side, facing the first side plate split body, of a second side plate split body is provided with a lateral extending part, and in the process that the side plates are converted from a folded state to an unfolded state, the locking structure is locked by the lock body and the elastic structure; when the side plate is in the unfolded state, the lateral extending part pushes the lock body to move in the direction away from the lateral extending part in the second direction, the elastic structure is compressed, and when the side plate is converted to the unfolded state, the lock body moves in the direction close to the lateral extending part in the second direction under the action of elastic restoring force of the elastic structure and is in stopping fit with the lateral extending part. The box body unit comprises two box bodies arranged in the second direction in a spaced mode. According to the technical scheme, the problems that when an existing folding box is switched to the unfolding state, manual locking is needed, the use difficulty is increased, the box body is possibly folded accidentally due to the fact that locking is forgotten, and the use experience is poor can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of folding boxes, and more specifically, to a folding box. Background Art

[0002] In modern life, with the accelerating pace of people's lives and the limited living space, storage boxes have become an important tool for daily household and personal storage. They can not only help people organize and classify various items, but also save space when not in use, improving the cleanliness and comfort of the living environment. The design and functions of storage boxes are also constantly innovating and improving to meet the needs of different users. To further optimize the space utilization rate of storage boxes, the foldable design has emerged. This design allows the storage box to be folded up when not in use, reducing the occupied space and facilitating storage.

[0003] The foldable storage box usually consists of a front box panel, a rear box panel, two side box panels, and a movable bottom plate. The side box panels are composed of two side plates connected by hinges, enabling the box body to be switched between the folded state and the unfolded state. Although the foldable storage box has obvious advantages in space utilization, there are still some inconveniences in actual use in the existing design. For example, when a user needs to unfold the storage box, although the two side plates can be unfolded, they often need to be manually locked to fix the box body. This step not only increases the difficulty of use but also may cause the box body to fold accidentally due to forgetting to lock, resulting in a poor use experience. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a folding box, which can solve the problem that when the existing folding box is switched to the unfolded state, it needs to be manually locked, which not only increases the difficulty of use but also may cause the box body to fold accidentally due to forgetting to lock, resulting in a poor use experience.

[0005] To achieve the above object, the present utility model provides a folding box, comprising: two side plates, which are arranged at intervals in a first direction. The side plates have a deployed state and a folded state. The side plates include a first side plate sub - body and a second side plate sub - body that are connected. A locking structure is provided on the first side plate sub - body. The locking structure has a locked state for keeping the side plate in the deployed state and an unlocked state for enabling the side plate to switch from the deployed state to the folded state. The locking structure includes a lock body and an elastic structure. A lateral extension portion is provided on the side of the second side plate sub - body facing the first side plate sub - body. During the process of the side plate being converted from the folded state to the deployed state, the lateral extension portion pushes the lock body to move in a second direction away from the lateral extension portion, and the elastic structure is compressed. When the side plate is converted to the deployed state, the lock body moves in the second direction towards the lateral extension portion under the elastic restoring force of the elastic structure and forms a stop fit with the lateral extension portion, and the locking structure is in the locked state; a box body unit, including two boxes arranged at intervals in the second direction. One of the two side plates is connected to the first side of the box body unit, and the other of the two side plates is connected to the second side of the box body unit, and they enclose the folding box body.

[0006] Further, a guiding inclined surface is provided at one end of the lock body close to the lateral extension portion. The height of the guiding inclined surface gradually decreases in the direction close to the lateral extension portion. During the process of the side plate being converted from the folded state to the deployed state, the lateral extension portion abuts against the guiding inclined surface and slides along the guiding inclined surface.

[0007] Further, the folding box body has a receiving cavity. A locking structure mounting position is provided on the side of the first side plate sub - body facing the receiving cavity. The locking structure is mounted on the locking structure mounting position. The locking structure mounting position includes a first convex structure. A second convex structure is provided on the side of the first convex structure close to the lock body. The second convex structure and the first convex structure jointly enclose an elastic structure mounting position. One end of the elastic structure passes through the elastic structure mounting position, and the other end of the elastic structure extends towards the end of the lock body away from the lateral extension portion.

[0008] Further, the locking structure mounting position further includes a mounting frame and a connecting structure. The mounting frame is connected to the connecting structure. The lock body is movably arranged in the second direction between the mounting frame and the side plate.

[0009] Further, the connecting structure includes two third convex structures arranged at intervals in a third direction. Along the second direction, two fourth convex structures are arranged at intervals on the sides of the two third convex structures away from each other. Both of the two fourth convex structures form a clamping space with the side of the side plate facing the receiving cavity. Along the third direction, two clamping protrusions are provided on both sides of the mounting frame, and each clamping protrusion is clamped in the corresponding clamping space.

[0010] Further, a limiting projection is also provided on the third convex structure. Along the third direction, hooks capable of forming a limiting fit with the limiting projection in the second direction are correspondingly provided on both sides of the mounting bracket.

[0011] Further, the locking structure mounting position further includes a stop structure. The stop structure is arranged on the side of the limiting projection away from the lateral extension part. Along the second direction, one end of the mounting bracket away from the lateral extension part forms a limiting fit with the stop structure.

[0012] Further, the mounting bracket has a sliding groove, and the lock body includes a fifth convex structure. The fifth convex structure is slidably arranged in the sliding groove along the second direction, and the fifth convex structure protrudes from the sliding groove.

[0013] Further, a sixth convex structure is arranged on the side of the lock body close to the side plate. The sixth convex structure extends along the second direction. The sixth convex structure is in sliding fit with the side of the first side plate facing the accommodation cavity separately, and the height of the sixth convex structure is the same as the thickness of the lateral extension part.

[0014] Further, a handle position is also provided on the second side plate separately. One end of the handle position facing the locking structure forms a lateral extension part.

[0015] Applying the technical solution of the present utility model, when the folding box needs to be in the unfolded state for storage, the lateral extension part pushes the lock body to move along the second direction away from the lateral extension part. The elastic structure is compressed during the movement of the lock body. When the side plate is switched to the unfolded state, the lateral extension part is separated from the lock body, and the lateral extension part moves to the side of the lock body away from the side plate opposite to the side plate (the side plate on the side where the lock body is located). At this time, the lock body moves along the second direction towards the lateral extension part under the elastic restoring force of the elastic structure, and the lock body forms a stop for the lateral extension part, thereby keeping the side plate in the unfolded state, that is, the locking structure is in the locked state. Compared with the prior art of manually locking, in the present utility model, through the above settings, when the user unfolds the side plate, through the cooperation of the lateral extension part, the lock body and the elastic structure, the automatic locking after the folding box is unfolded can be realized. The user does not need to lock manually, thereby reducing the use difficulty and avoiding the phenomenon that the box body is accidentally folded due to forgetting to lock, thus improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The specification drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0017] Figure 1 A perspective view of the folding box according to the embodiment of the present utility model is shown (the side plate is in the unfolded state);

[0018] Figure 2 shows a partial structural schematic diagram of a folding box according to an embodiment of the present utility model;

[0019] Figure 3 shows Figure 2 an enlarged view of part A in

[0020] Figure 4 shows a partial structural schematic diagram of a folding box according to an embodiment of the present utility model;

[0021] Figure 5 shows Figure 4 an enlarged view of part B in

[0022] Figure 6 shows a partial structural schematic diagram of a folding box according to an embodiment of the present utility model;

[0023] Figure 7 shows a structural schematic diagram of a lock body of a folding box according to an embodiment of the present utility model from one angle;

[0024] Figure 8 shows a structural schematic diagram of a lock body of a folding box according to an embodiment of the present utility model from another angle;

[0025] Figure 9 shows a structural schematic diagram of a mounting bracket according to an embodiment of the present utility model;

[0026] Figure 10 shows a perspective view of a folding box according to an embodiment of the present utility model from another angle;

[0027] Figure 11 shows a perspective view of a folding box according to an embodiment of the present utility model (with side plates in a folded state).

[0028] Among them, the above-mentioned drawings include the following reference numerals:

[0029] 10, side plate; 11, first side plate split body; 12, second side plate split body; 13, handle position; 131, through hole; 20, box body; 30, locking structure; 31, lock body; 311, guiding inclined surface; 312, fifth protrusion structure; 313, sixth protrusion structure; 314, groove; 32, elastic structure; 40, lateral extension part; 50, locking structure mounting position; 51, first protrusion structure; 511, second protrusion structure; 512, elastic structure mounting position; 52, mounting bracket; 521, clamping protrusion; 522, hook; 523, chute; 53, connecting structure; 531, third protrusion structure; 532, fourth protrusion structure; 533, limiting protrusion; 54, stop structure; 60, cover plate; 70, bottom plate; 80, roller. Detailed implementation manners

[0030] It should be noted that, without conflict, the embodiments and features in the embodiments of the present utility model can be combined with each other. The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0031] Referring to Figures 1 to 11 As shown, the present utility model provides a folding box, which includes: two side plates 10, the two side plates 10 are arranged at intervals in the first direction, the side plates 10 have an unfolded state and a folded state, the side plates 10 include a connected first side plate part 11 and a second side plate part 12, a locking structure 30 is arranged on the first side plate part 11, the locking structure 30 has a locked state for keeping the side plate 10 in the unfolded state and an unlocked state for enabling the side plate 10 to switch from the unfolded state to the folded state, the locking structure 30 includes a lock body 31 and an elastic structure 32, a lateral extension part 40 is arranged on the side of the second side plate part 12 facing the first side plate part 11, during the process of the side plate 10 being converted from the folded state to the unfolded state, the lateral extension part 40 pushes the lock body 31 to move in the second direction away from the lateral extension part 40, and the elastic structure 32 is compressed, when the side plate 10 is converted to the unfolded state, the lock body 31 moves in the second direction towards the lateral extension part 40 under the elastic restoring force of the elastic structure 32 and forms a stop fit with the lateral extension part 40, and the locking structure 30 is in the locked state; a box body unit, including two box bodies 20 arranged at intervals in the second direction, one of the two side plates 10 is connected to the first side of the box body unit, and the other of the two side plates 10 is connected to the second side of the box body unit, and encloses the folding box main body.

[0032] In this embodiment, when the first side plate part 11 and the second side plate part 12 are in the same plane, the side plate 10 is in the unfolded state, and at this time, the folding box is in the unfolded state (as shown in Figure 1 ), and has a storage function. When the first side plate part 11 and the second side plate part 12 form an included angle (wherein, the included angle is greater than or equal to 0° and less than 30°), at this time, the side plate 10 is in the folded state, and the folding box is in the folded state (as shown in Figure 11 ), in the folded state, the volume of the folding box is small, which is convenient for storage and at the same time convenient for handling. The second direction is the unlocking direction of the locking structure 30. One of the two side plates 10 is connected to the first side of the box body unit, and the other of the two side plates 10 is connected to the second side of the box body unit, and encloses the folding box main body. A bottom plate 70 is arranged at the bottom of the folding box main body, the folding box main body has a receiving cavity, and the bottom plate 70 forms the bottom of the receiving cavity. When the side plate 10 is in the unfolded state, the folding box main body is in the state shown in Figure 1 and can be used for storage. When the side plate 10 is in the folded state, the folding box main body is in the state shown in Figure 11In the state shown in the figure, the two boxes 20 are buckled together, and the two side plates 10 are received into the accommodation space formed by the buckling of the two boxes 20.

[0033] When the folding box needs to be in the unfolded state for storage, the lateral extension part 40 pushes the lock body 31 to move in the second direction away from the lateral extension part 40. The elastic structure 32 is compressed during the movement of the lock body 31. When the side plate 10 is converted to the unfolded state, the lateral extension part 40 is disengaged from the lock body 31, and the lateral extension part 40 moves to the side away from the side plate 10 that is oppositely arranged to the side plate 10 (the side plate 10 on the side where the lock body 31 is located). At this time, the lock body 31 moves in the second direction towards the lateral extension part 40 under the elastic restoring force of the elastic structure 32. The lock body 31 forms a stop for the lateral extension part 40, thereby keeping the side plate 10 in the unfolded state, that is, the locking structure 30 is in the locked state. When the folding box needs to be in the folded state, the lock body 31 is manually toggled to move the lock body 31 in the second direction away from the lateral extension part 40, so that the lock body 31 is in the unlocked state. Compared with the prior art of manually locking, in the present utility model, through the above arrangement, when the user unfolds the side plate 10, through the cooperation of the lateral extension part 40, the lock body 31 and the elastic structure 32, automatic locking after the folding box is unfolded can be achieved. The user does not need to manually lock, thereby reducing the use difficulty and avoiding the accidental folding of the box 20 caused by forgetting to lock, thus improving the user experience.

[0034] In one embodiment, the elastic structure 32 is a spring.

[0035] Combined with the reference to Figures 1 to 11 As shown in the figure, in one embodiment of the present utility model, a guiding inclined surface 311 is provided at one end of the lock body 31 close to the lateral extension part 40. The height of the guiding inclined surface 311 gradually decreases along the direction close to the lateral extension part 40. During the process of the side plate 10 being converted from the folded state to the unfolded state, the lateral extension part 40 abuts against the guiding inclined surface 311 and slides along the guiding inclined surface 311.

[0036] In this embodiment, the height of the guiding inclined surface 311 refers to the height of the guiding inclined surface 311 in Figure 5 the direction perpendicular to the paper surface. During the process of the side plate 10 being converted from the folded state to the unfolded state, the lateral extension part 40 abuts against the guiding inclined surface 311 and slides along the guiding inclined surface 311 from the position with a higher height of the guiding inclined surface 311 to the position with a lower height of the guiding inclined surface 311. During the sliding process, the lock body 31 is pushed to move in the second direction away from the lateral extension part 40.

[0037] In one embodiment, the first side plate split body 11 is hinged to the second side plate split body 12 so that the side plate 10 can be switched between an unfolded state and a folded state.

[0038] Specifically, the first side plate split body 11 and the second side plate split body 12 are hinged by a cylindrical pin. The box body 20 and the side plate 10 connected thereto are hinged by a cylindrical pin.

[0039] Referring to Figures 1 to 11 As shown, in one embodiment of the present utility model, the folding box body has a receiving cavity. A locking structure installation position 50 is provided on one side of the first side plate split body 11 facing the receiving cavity. The locking structure 30 is installed in the locking structure installation position 50. The locking structure installation position 50 includes a first protrusion structure 51. A second protrusion structure 511 is provided on one side of the first protrusion structure 51 close to the lock body 31. The second protrusion structure 511 and the first protrusion structure 51 together enclose an elastic structure installation position 512. One end of the elastic structure 32 passes through the elastic structure installation position 512, and the other end of the elastic structure 32 extends out towards the end of the lock body 31 away from the lateral extension portion 40.

[0040] In this embodiment, the locking structure installation position 50 can realize the installation of the locking structure 30, and the elastic structure installation position 512 can realize the installation of the elastic structure 32. One end of the elastic structure 32 is inserted into the elastic structure installation position 512, and the other end of the elastic structure 32 extends out towards the end of the lock body 31 away from the lateral extension portion 40. When the folding box needs to be in the unfolded state for storage, the lateral extension portion 40 pushes the lock body 31 to move in the second direction away from the lateral extension portion 40. During the movement of the lock body 31, the end of the elastic structure 32 away from the lateral extension portion 40 contacts and compresses the elastic structure 32. As can be seen from the above, the setting of the elastic structure 32 can provide an elastic force for the lock body 31 to move towards the lateral extension portion 40 without manual operation by the user.

[0041] Referring to Figures 1 to 11 As shown, in one embodiment of the present utility model, a groove 314 is provided at the end of the lock body 31 away from the lateral extension portion 40. The bottom of the groove 314 is a plane. The other end of the elastic structure 32 extends out towards the end of the lock body 31 away from the lateral extension portion 40 and extends into the groove 314. The side wall of the groove 314 can form a circumferential limit for the elastic structure 32 to ensure the structural stability of the elastic structure 32.

[0042] Referring to Figures 1 to 11 As shown, in one embodiment of the present utility model, there are two second protrusion structures 511. The two second protrusion structures 511 are arranged at intervals in the third direction on one side of the first protrusion structure 51 close to the lock body 31, and the three together enclose the elastic structure installation position 512.

[0043] With reference to Figures 1 to 11 As shown, in one embodiment of the present utility model, the installation position 50 of the locking structure further includes an installation frame 52 and a connection structure 53. The installation frame 52 is connected to the connection structure 53, and the lock body 31 is movably disposed between the installation frame 52 and the side plate 10 along the second direction.

[0044] Through the above settings, the installation of the installation frame 52 can be realized, and at the same time, the installation of the lock body 31 can also be realized.

[0045] With reference to Figures 1 to 11 As shown, in one embodiment of the present utility model, the connection structure 53 includes two third protrusion structures 531 spaced apart along the third direction. Along the second direction, two fourth protrusion structures 532 are spaced apart on the sides of the two third protrusion structures 531 away from each other. Both of the two fourth protrusion structures 532 form a clamping space with the side of the side plate 10 facing the accommodation cavity. Along the third direction, two clamping protrusions 521 are provided on both sides of the installation frame 52, and each clamping protrusion 521 is clamped in the corresponding clamping space.

[0046] In this embodiment, the clamping protrusion 521 is inserted into the corresponding clamping space, realizing the clamping between the installation frame 52 and the connection structure 53, and further realizing the installation of the installation frame 52.

[0047] With reference to Figures 1 to 11 As shown, in one embodiment of the present utility model, a limiting protrusion 533 is further provided on the third protrusion structure 531. Along the third direction, clamping hooks 522 capable of forming a limiting fit with the limiting protrusion 533 in the second direction are correspondingly provided on both sides of the installation frame 52.

[0048] In this embodiment, the clamping hook 522 forms a limiting fit with the side of the limiting protrusion 533 away from the lateral extension part 40. Through the above settings, the problem that the installation frame 52 slides off the connection structure 53 due to the movement of the installation frame 52 along the second direction towards the direction close to the lateral extension part 40 can be prevented.

[0049] With reference to Figures 1 to 11 As shown, in one embodiment of the present utility model, the installation position 50 of the locking structure further includes a stop structure 54. The stop structure 54 is provided on the side of the limiting protrusion 533 away from the lateral extension part 40. Along the second direction, one end of the installation frame 52 away from the lateral extension part 40 forms a limiting fit with the stop structure 54.

[0050] In this embodiment, the stop structure 54 can stop one end of the installation frame 52 away from the lateral extension part 40, preventing the problem that the installation frame 52 slides off the connection structure 53 due to the movement of the installation frame 52 along the second direction away from the lateral extension part 40.

[0051] Referring to Figures 1 to 11 As shown, in an embodiment of the present utility model, the mounting bracket 52 has a sliding groove 523, and the lock body 31 includes a fifth protrusion structure 312. The fifth protrusion structure 312 is slidably disposed in the sliding groove 523 along the second direction, and the fifth protrusion structure 312 protrudes from the sliding groove 523.

[0052] In this embodiment, the fifth protrusion structure 312 protrudes from the sliding groove 523, which facilitates the user to toggle the fifth protrusion structure 312, so that the lock body 31 moves along the second direction away from the lateral extension portion 40, thereby converting the locking structure 30 to the unlocked state.

[0053] Referring to Figures 1 to 11 As shown, in an embodiment of the present utility model, a sixth protrusion structure 313 is provided on one side of the lock body 31 close to the side plate 10. The sixth protrusion structure 313 extends along the second direction. The sixth protrusion structure 313 is slidably engaged with the side of the first side plate split 11 facing the receiving cavity, and the height of the sixth protrusion structure 313 is the same as the thickness of the lateral extension portion 40.

[0054] In this embodiment, the sixth protrusion structure 313 is provided on the side of the lock body 31 away from the side plate 10 (the side plate 10 opposite to the side plate 10 where the lock body 31 is located). The setting of the sixth protrusion structure 313 makes a gap that can accommodate the lateral extension portion 40 formed between one end of the lock body 31 close to the lateral extension portion 40 and the first side plate split 11 on the side where the lock body 31 is located. In this way, when the side plate 10 is in the unfolded state, the lateral extension portion 40 can extend into this gap. At this time, one end of the lock body 31 close to the lateral extension portion 40 can form a stop against the lateral extension portion 40, and further enable the side plate 10 to be kept in the unfolded state.

[0055] It should be noted that taking Figure 3 as an example, the thickness of the lateral extension portion 40 refers to the thickness of the lateral extension portion 40 in the direction perpendicular to the paper surface.

[0056] Referring to Figures 1 to 11 As shown, in an embodiment of the present utility model, a handle position 13 is further provided on the second side plate split 12, and a lateral extension portion 40 is formed at one end of the handle position 13 facing the locking structure 30.

[0057] In this embodiment, the setting of the handle position 13 facilitates the user to carry the folding box. The lateral extension portion 40 is formed at one end of the handle position 13 facing the locking structure 30, and can cooperate with the lock body 31 and the elastic structure 32 to realize automatic locking when the side plate 10 is in the unfolded state.

[0058] Referring to Figures 1 to 11As shown, in one embodiment of the present utility model, the handle position 13 includes a through hole 131 communicating with the accommodation cavity. When carrying the folding box, the user can insert the hand into the through hole 131 and lift the folding box to achieve the carrying operation.

[0059] Referring to Figures 1 to 11 As shown, in one embodiment of the present utility model, the folding box further includes a cover plate 60. When the folding box is in the unfolded state, the cover plate 60 covers the top of the folding box to prevent dust from falling into the folding box; when the folding box is in the folded state, the cover plate 60 is hung on one of the boxes 20. Two rollers 80 are provided at the bottom of each of the two boxes 20, and the two rollers 80 are spaced apart in the first direction to facilitate the movement of the folding box.

[0060] From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects: when the folding box needs to be in the unfolded state for storage, the lateral extension portion pushes the lock body to move in the second direction away from the lateral extension portion, and the elastic structure is compressed during the movement of the lock body. When the side plate is switched to the unfolded state, the lateral extension portion is disengaged from the lock body, and the lateral extension portion moves to one side of the lock body away from the side plate opposite to the side plate (the side plate on the side where the lock body is located). At this time, the lock body moves in the second direction towards the lateral extension portion under the elastic restoring force of the elastic structure, and the lock body forms a stop against the lateral extension portion, thereby keeping the side plate in the unfolded state, that is, the locking structure is in the locked state. Compared with the prior art of manually locking, in the present utility model, through the above settings, when the user unfolds the side plate, through the cooperation of the lateral extension portion, the lock body and the elastic structure, the folding box can be automatically locked after being unfolded. The user does not need to manually lock, thereby reducing the use difficulty and avoiding the phenomenon that the box is accidentally folded due to forgetting to lock, thus improving the user experience.

[0061] Obviously, the above-described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0062] It should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0063] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A folding box, characterized in that, Comprising: Two side plates (10), the two side plates (10) are arranged at intervals in the first direction. The side plates (10) have an unfolded state and a folded state. The side plates (10) include a first side plate part (11) and a second side plate part (12) that are connected. A locking structure (30) is provided on the first side plate part (11). The locking structure (30) has a locked state for keeping the side plate (10) in the unfolded state and an unlocked state for enabling the side plate (10) to switch from the unfolded state to the folded state. The locking structure (30) includes a lock body (31) and an elastic structure (32). A lateral extension part (40) is provided on one side of the second side plate part (12) facing the first side plate part (11). During the process of the side plate (10) being converted from the folded state to the unfolded state, the lateral extension part (40) pushes the lock body (31) to move in a second direction away from the lateral extension part (40), and the elastic structure (32) is compressed. When the side plate (10) is converted to the unfolded state, the lock body (31) moves in the second direction towards the lateral extension part (40) under the elastic restoring force of the elastic structure (32) and forms a stop fit with the lateral extension part (40), and the locking structure (30) is in the locked state. A box body unit, including two boxes (20) arranged at intervals in the second direction. One of the two side plates (10) is connected to the first side of the box body unit, and the other of the two side plates (10) is connected to the second side of the box body unit, and encloses a folded box body.

2. The folding box according to claim 1, characterized in that, One end of the lock body (31) close to the lateral extension part (40) is provided with a guiding inclined surface (311). The height of the guiding inclined surface (311) gradually decreases in the direction close to the lateral extension part (40). During the process of the side plate (10) being converted from the folded state to the unfolded state, the lateral extension part (40) abuts against the guiding inclined surface (311) and slides along the guiding inclined surface (311).

3. The folding box according to claim 1, wherein, The folded box body has a receiving cavity. A locking structure installation position (50) is provided on one side of the first side plate part (11) facing the receiving cavity. The locking structure (30) is installed in the locking structure installation position (50). The locking structure installation position (50) includes a first convex structure (51). A second convex structure (511) is provided on one side of the first convex structure (51) close to the lock body (31). The second convex structure (511) and the first convex structure (51) jointly enclose an elastic structure installation position (512). One end of the elastic structure (32) passes through the elastic structure installation position (512), and the other end of the elastic structure (32) extends towards the end of the lock body (31) away from the lateral extension part (40).

4. The folding box according to claim 3, characterized in that, The installation position (50) of the locking structure further includes a mounting bracket (52) and a connecting structure (53). The mounting bracket (52) is connected to the connecting structure (53), and the lock body (31) is movably arranged between the mounting bracket (52) and the side plate (10) along the second direction.

5. The folding box according to claim 4, characterized in that, The connecting structure (53) includes two third protrusion structures (531) spaced apart along the third direction. Along the second direction, two fourth protrusion structures (532) are spaced apart on the side of the two third protrusion structures (531) away from each other. Both of the two fourth protrusion structures (532) form a clamping space with the side of the side plate (10) facing the accommodation cavity. Along the third direction, both sides of the mounting bracket (52).

6. The folding box according to claim 5, characterized in that, A limiting protrusion (533) is further arranged on the third protrusion structure (531). Along the third direction, hooks (522) capable of forming a limiting fit with the limiting protrusion (533) in the second direction are correspondingly arranged on both sides of the mounting bracket (52).

7. The folding box according to claim 6, wherein The installation position (50) of the locking structure further includes a stop structure (54). The stop structure (54) is arranged on the side of the limiting protrusion (533) away from the lateral extension part (40). Along the second direction, one end of the mounting bracket (52) away from the lateral extension part (40) forms a limiting fit with the stop structure (54).

8. The folding box according to claim 4, characterized in that, The mounting bracket (52) has a sliding groove (523). The lock body (31) includes a fifth protrusion structure (312). The fifth protrusion structure (312) is slidably arranged in the sliding groove (523) along the second direction, and the fifth protrusion structure (312) protrudes from the sliding groove (523).

9. The folding box according to any one of claims 3 to 8, characterized in that, A sixth protrusion structure (313) is arranged on the side of the lock body (31) close to the side plate (10). The sixth protrusion structure (313) extends along the second direction. The sixth protrusion structure (313) is slidably matched with the side of the first side plate split body (11) facing the accommodation cavity, and the height of the sixth protrusion structure (313) is the same as the thickness of the lateral extension part (40).

10. The folding box according to any one of claims 1 to 8, characterized in that, A handle position (13) is further arranged on the second side plate split body (12). One end of the handle position (13) facing the locking structure (30) forms the lateral extension part (40).

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