A collapsible box

Abstract

This utility model discloses a foldable box, including a rectangular top plate, two short side plates, two long side plates, two cylinder groups, and four locking mechanisms. The lower surface of the top plate along its long side has parallel guide rail grooves, with both ends forming storage openings at the short sides of the top plate. The short side plates are movably mounted on the guide rail grooves. The long side plates are respectively hinged to the two long sides of the top plate. Each cylinder group consists of at least one cylinder, with two cylinder groups connected to the two short side plates respectively, to drive the two short side plates to perform translational and rotational movements. The locking mechanisms include mutually cooperating limiting parts and locking parts. When the cylinder groups drive the inner surfaces of the short side plates to the storage openings, the locking parts engage with the limiting parts to form a rotating pair. At this time, the cylinder groups retract, driving the short side plates to generate torque and rotate, causing the top plate to rise and form a stable three-dimensional box structure. This foldable box saves manpower and has a simple structure.

Description

Technical Field

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

[0002] With the increasing popularity of outdoor recreational activities, motorhomes and outdoor folding space structures are widely favored for their flexibility and convenience. However, existing motorhomes are limited by their fixed body structure, which restricts their space expansion methods: they usually adopt a compact layout to improve space utilization, but this results in a small living area; or they rely on external trailers to increase the usable area, but this reduces vehicle mobility and affects driving and parking convenience.

[0003] Furthermore, existing outdoor foldable space structures (such as foldable houses and extendable cabins) generally suffer from complex structures, numerous components, and cumbersome operation. Their unfolding and folding processes largely rely on manual operation, such as manually folding side panels, adjusting support rods, and fixing connectors. This is not only time-consuming and labor-intensive but also demands a high level of physical strength and operational proficiency from the user. At the same time, the stability and efficiency of manual operation are difficult to guarantee, especially in inclement weather or emergency use scenarios, further reducing the user experience. Utility Model Content

[0004] Based on this, this utility model provides a foldable box to overcome the limitations of existing RV space and the shortcomings of existing foldable space structures, such as cumbersome construction, complex structure, and reliance on manual operation.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A foldable box includes a rectangular top plate, two short side plates, two long side plates, two cylinder assemblies, and four locking mechanisms. The lower surface of the top plate along its long side has parallel guide grooves on both sides, with each guide groove forming a storage opening at both ends of the short side of the top plate. The two short side plates are slidably mounted on the lower surface of the top plate via the parallel guide grooves. The two long side plates are hinged to the two long sides of the top plate, and each long side plate is formed by hinged two pieces of sheet metal. Each cylinder assembly consists of at least one cylinder, with two cylinders... The cylinder assembly is connected to the two short side plates respectively to drive the two short side plates to perform translation and rotation. Each locking mechanism includes a limiting part at the guide rail groove receiving opening and a locking part on the short side plate. When the cylinder assembly drives the inner side of the short side plate to move to the guide rail groove receiving opening, the locking part engages with the limiting part to form a rotating pair, restricting the translational movement of the two short side plates and causing them to only rotate around the rotating pair. At this time, the cylinder retracts and drives the short side plate to generate torque and rotate around the rotating pair as the fulcrum, and drives the top plate to rise to form a stable three-dimensional box structure.

[0007] The foldable box described in this utility model does not require manual assembly. The assembly process from the folded state to the box space can be completed through the extension and retraction of the cylinder group and the cooperation of the locking mechanism. Based on the simplification of the structure, it effectively improves the convenience and efficiency of use and has strong practicality.

[0008] In one embodiment, the locking part includes a pin and corresponding mating holes. The mating holes are located on both sides of the inner surface of the short side plate. The limiting part is a positioning hole located at the guide rail groove receiving opening. When the inner surface of the short side plate moves to the guide rail groove receiving opening, the pin is inserted into the positioning hole and the mating hole to form a rotating pair. At this time, the pin restricts the displacement of the short side plate along the extension direction of the guide rail groove, allowing it to only rotate around the pin.

[0009] In one embodiment, the limiting part is a positioning hole located at the guide rail groove receiving opening, and the engaging part is an elastic element located on both sides of the inner surface of the short side plate. When the inner surface of the short side plate moves to the guide rail groove receiving opening, the elastic element pops out and engages with the positioning hole to form a rotating pair. At this time, the elastic element restricts the displacement of the short side plate along the extension direction of the guide rail groove, allowing it to only rotate around the elastic element.

[0010] In one embodiment, the limiting part is a slot located at the guide rail groove receiving opening, and the engaging part is a pair of rolling wheels located on both sides of the bottom surface of the short side plate. The rolling wheels are coaxially rotatable and are located at one end near the inner surface of the short side plate. When the inner surface of the short side plate moves to the guide rail groove receiving opening, the rolling wheels fall into the slot to form a rotating pair. At this time, the rolling wheels restrict the displacement of the short side plate along the extension direction of the guide rail groove, allowing it to only rotate around the rolling wheels.

[0011] Furthermore, at least one connecting piece is provided on the outer surface of the two short side plates. This facilitates the connection of the cylinder to the short side plates and drives the short side plates to perform translational and rotational movements.

[0012] Furthermore, each of the cylinder assemblies includes a base and a cylinder, the cylinder including a cylinder body and a piston rod, the cylinder body being hinged to the base, one end of the piston rod being movably engaged with the cylinder body, and the other end being fixedly connected to the connecting piece.

[0013] Furthermore, the cylinder assembly consists of two cylinders, and two connecting plates are spaced apart on the outer surface of the short side plate; the piston rod of each cylinder is connected to the two connecting plates of the same side short side plate, and each cylinder assembly operates synchronously to drive the two short side plates to move synchronously along the guide rail groove, ensuring that the two short side plates are subjected to balanced force and avoiding jamming caused by single-point drive.

[0014] Furthermore, the connecting piece is a hinge structure, including a first connecting piece and a second connecting piece, which are rotatably connected by a hinge shaft. The first connecting piece is fixedly connected to the upper surface perpendicular to the outer side surface of the short side plate, and the second connecting piece is connected to the piston push rod of the cylinder.

[0015] Furthermore, it also includes a base plate, which is arranged parallel to the top plate and located below the guide rail groove. The two ends of the long side plate are respectively hinged between the top plate and the base plate. The base of the cylinder assembly is located on the side of the base plate facing the top plate. By adding a base plate, the foldable box can be used independently without relying on the vehicle roof, thereby expanding into more diverse application scenarios.

[0016] Furthermore, the top plate is provided with a top protrusion plate perpendicularly along its two long sides, the top protrusion plate is located below the guide rail groove and protrudes in a direction away from the top plate; the bottom plate is provided with a bottom protrusion plate perpendicularly along its two long sides, the bottom protrusion plate protrudes towards the side where the top plate is located, and the two ends of the long side plate are respectively hinged to the top protrusion plate and the bottom protrusion plate.

[0017] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the foldable box of this utility model;

[0019] Figure 2 This is a schematic diagram of the unfolded structure of the foldable box of this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the foldable box body of this utility model when the inner side of the short side plate moves to the guide rail groove storage opening;

[0021] Figure 4 This is a schematic diagram of the cylinder assembly for the foldable housing of this utility model;

[0022] Figure 5 This is a right view (including the bottom plate) of the foldable box of this utility model;

[0023] Figure 6 This is a right view (including the bottom plate) of the foldable box of this utility model in its folded state;

[0024] Figure 7 This is a right view of Embodiment 1 of the foldable box of this utility model;

[0025] Figure 8 This is a front view of embodiment 3 of the foldable box of this utility model;

[0026] Figure 9 This is a right view of Embodiment 3 of the foldable box of this utility model;

[0027] Reference numerals: 1. Top plate; 11. Guide rail groove; 12. Storage opening; 13. Top protrusion; 2. Short side plate; 21. Inner side; 22. Outer side; 23. Connecting piece; 23a. First connecting piece; 23b. Second connecting piece; 3. Long side plate; 3a. First long side plate; 3b. Second long side plate; 4. Cylinder assembly; 40. Cylinder; 41. Base; 42. Cylinder body; 43. Piston rod; 5. Locking mechanism; 511. Positioning hole; 512. Slot; 521. Pin; 524. Roller; 6. Base plate; 61. Bottom protrusion. Detailed Implementation

[0028] Example 1

[0029] This utility model addresses the limitations of existing RV space and the problems of cumbersome assembly, complex structure, and reliance on manual operation in existing foldable space structures. It provides a new type of foldable box that can complete the assembly process from the folded state to the box space simply by the extension and retraction of the cylinder assembly and the cooperation of the locking mechanism, saving manpower and simplifying the structure.

[0030] To enable those skilled in the art to better understand this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0031] Please see Figure 1 This is a schematic diagram of the overall structure of the foldable box of this application. The foldable box includes a rectangular top plate 1, two short side plates 2, two long side plates 3, two cylinder groups 4, and four locking mechanisms 5. The two short side plates 2 are slidably disposed on the lower surface of the top plate 1. The two long side plates 3 are respectively hinged to the two long sides of the top plate 1 and folded. When the cylinder groups 4 drive the short side plates 2 to translate to the edge of the top plate 1, the locking mechanisms 5 restrict the movement of the short side plates 2 and make them only rotate. At this time, the cylinder groups 4 retract and drive the short side plates 2 to generate torque and rotate around the locking mechanisms 5, thereby lifting the top plate 1 to form a stable three-dimensional box structure.

[0032] Specifically, the top plate 1 has a parallel guide groove 11 on each side of its lower surface along its long side. The two ends of each guide groove 11 together with the short edge of the top plate 1 form a storage opening 12. The two short side plates 2 are respectively arranged on the lower surface of the top plate 1 in a translatable manner through the parallel guide groove 11. When in a folded state, the short side plates 2 can be completely slid into the guide groove 11. The side of the short side plate 2 facing away from the storage opening 12 is the inner side 21, and the side closer to the storage opening 12 is the outer side 22. Preferably, at least one connecting piece 23 is fixedly connected to the outer side 22 of the short side plate 2. When in a folded state, the connecting piece 23 is at least partially exposed outside the storage opening 12. In this embodiment, the connecting piece 23 is a hinge structure, including a first connecting piece 23a and a second connecting piece 23b, which are rotatably connected by a hinge shaft. The first connecting piece 23a is fixedly connected to the upper surface perpendicular to the outer side surface of the short side plate. The hinge shaft is located at the junction of the outer side surface 22 and the upper surface. The second connecting piece 23b is connected to the cylinder assembly 4. To enable the short side plate 2 to rotate around the locking mechanism 5, the bottom panel that the guide rail groove 11 contacts with the short side plate 2 should be shorter than the length of the long side of the top plate 1, ensuring that the short side plate 2 has no mechanical interference during rotation.

[0033] The long side panels 3 are respectively hinged to the two long sides of the top plate 1, and each long side panel 3 is composed of two plates hinged together, namely a first long side panel 3a and a second long side panel 3b. The first long side panel 3a is hinged to the long side of the top plate 1, and the second long side panel 3b is hinged to the first long side panel 3a. When folded, the second long side panel 3b can be folded relative to the first long side panel 3a, and then the first long side panel 3a drives the whole to flip and be stored on the lower surface of the guide rail groove 11. When in the fully unfolded state, the first long side panel 3a and the second long side panel 3b are laid flat at 180°, together forming the two long side planes of the box. To avoid interference between the two long side plates 3 and the guide rail groove 11 when they rotate, the top plate 1 is provided with a top protrusion 13 perpendicular to its two long sides. The top protrusion 13 is located below the guide rail groove 11 and protrudes in a direction away from the top plate 1. The first long side plate 3a of the two long side plates 3 is connected to the corresponding top protrusion 13 through a hinge shaft.

[0034] Each cylinder assembly 4 consists of at least one cylinder 40. Two cylinder assemblies 4 are respectively connected to two short side plates 2 to drive the two short side plates 2 to perform translational and rotational movements. Specifically, each cylinder assembly 4 includes a cylinder 40 and a base 41. The base 41 is located below the top plate 1. The cylinder 40 includes a cylinder body 42 and a piston rod 43. The cylinder body 42 is hinged to the base 41. One end of the piston rod 43 is movably engaged with the cylinder body 40, and the other end is fixedly connected to the connecting piece 23 of the corresponding short side plate 2. To ensure smooth movement, preferably, the installation direction of the cylinder 40 is parallel to the guide rail groove 11, and the extension and retraction direction of the piston rod 43 is consistent with the extension direction of the guide rail groove 11. The piston push rod 43 and the connecting piece 23 are hinged together by a universal joint (not shown). This universal joint (not shown) can be a cross-type universal joint, a ball joint, or a flexible coupling to compensate for installation errors and adapt to changes in the motion trajectory of the short side plate 2 when switching from translation to rotation, ensuring that the axial driving force of the piston push rod 43 is effectively transmitted to the short side plate 2. Preferably, the cylinder assembly 4 consists of two cylinders 40, and two connecting pieces 23 are spaced apart on the outer surface 22 of the short side plate 2. The piston push rod 43 of each cylinder 40 is connected to the two connecting pieces 23 of the short side plate 2 on the same side. Each cylinder assembly 4 operates synchronously to drive the two short side plates 2 to translate synchronously along the guide rail groove 11. When used attached to the roof, the base 41 of the cylinder assembly 4 is mounted on the roof.

[0035] The locking mechanism 5 includes a limiting part and a locking part that cooperate with each other. The limiting part is a positioning hole 511 provided at the receiving opening 12 of the guide rail groove 11. The locking part includes a pin 521 and a corresponding mating hole (not shown in the figure). The mating hole is provided on both sides of the inner side surface 21 of the short side plate 2. When the inner side surface 21 of the short side plate 2 moves along the guide rail groove 11 to the receiving opening 12, the axis of the mating hole coincides with the axis of the positioning hole 511. At this time, the pin 521 is inserted into the positioning hole 511 and the mating hole to form a rotating pair, which restricts the displacement of the short side plate 2 along the extension direction of the guide rail groove 11, so that it can only rotate around the pin 521.

[0036] When the foldable box is used not only attached to the roof of the vehicle, it also includes a base plate 6, which is arranged parallel to the top plate 1 and located below the guide rail groove 11. The two ends of the long side plate 3 are respectively hinged between the top plate 1 and the base plate 6. The base 41 of the cylinder assembly 4 is located on the side of the base plate 6 facing the top plate 1. Preferably, the two sides of the base plate 6 are provided with bottom protrusions 61 perpendicular to the long side direction. The bottom protrusions 61 extend along the long side direction of the base plate and protrude towards the side where the top plate 1 is located. The first long side plate 3a is hinged to the top protrusion 13, and the second long side plate 3b is hinged to the bottom protrusion.

[0037] After the foldable box is unfolded, in order to facilitate entry and exit from the box space, preferably, the short side panel 2 is provided with an openable door. The door is positioned to avoid the installation area of ​​the connecting piece 23 of the short side panel 2, so as to ensure that the translation and rotation of the short side panel 2 are not disturbed.

[0038] In practice, the two cylinder groups 4 are activated, and the piston push rods 43 extend linearly under the power of the cylinder body 42. Through the connecting piece 23, they push the two short side plates 2 to slide out towards each other along the guide rail groove 11 from the receiving opening 12. When the piston push rods 43 drive the inner side surface 21 of the short side plate 2 to move to the receiving opening 12 of the guide rail groove 11, the axis of the mating holes on both sides of the inner side surface 21 coincides with the axis of the positioning hole 511 at the receiving opening 12 of the guide rail groove 11. At this time, the pin 52 is inserted. 1. This allows the two holes to form a rotating pair, restricting the displacement of the short side plate 2 along the extension direction of the guide rail groove 11. This ensures that the short side plate 2 can only rotate around the pin 521. At this time, the cylinder group 4 controls the piston push rod 43 to retract, and applies torque through the connecting piece 23, thereby forcing the short side plate 2 to rotate and lift around the axis of the pin 521, and driving the top plate 1 to rise synchronously. The two long side plates 3 automatically unfold as the top plate 1 rises, ultimately forming a stable box structure with orthogonal panels.

[0039] When it needs to be folded up, the cylinder assembly 4 is activated in the same way, so that the piston push rod 43 extends again under the power of the cylinder body 42. Since the short side plate 2 has been rotatably connected to the guide rail groove 11 through the pin 521, the piston push rod 43 pushes the short side plate 2 to rotate around the pin 521 through the connecting piece 23, so that the outer side surface 22 of the short side plate 2 moves away from the guide rail groove 11. At this time, the top plate 1 drops due to the loss of the support of the short side plate 2, and the two long side plates 3 fold inward around their respective hinge axes to below the guide rail groove 11. When the short side plate 2 rotates around the pin 521 to be roughly flush with the plane where the top plate 1 is located, the piston push rod 43 stops extending, the pin 521 is pulled out to release the positioning, the cylinder assembly 4 controls the piston push rod 43 to retract, and pulls the two short side plates 2 to move relatively horizontally along the guide rail groove 11 until they are completely retracted to below the top plate 1, and the box is completely folded.

[0040] Example 2

[0041] The foldable case in this embodiment 2 has a structure that is basically the same as that in embodiment 1. The only difference is that the locking mechanism 5 has a latching part that is an elastic element (not shown in the figure) located on both sides of the inner side surface 21 of the short side plate 2.

[0042] The limiting part is a positioning hole 511 located at the receiving opening 12 of the guide rail groove 11. When the inner surface 21 of the short side plate 2 moves to the receiving opening 12 of the guide rail groove 11, the elastic element is compressed inward by the inner wall of the guide rail groove 11 and elastically deforms. When the elastic element moves to the position of the positioning hole 511, the compression from the inner wall of the guide rail groove 11 is released, and it pops out and gets stuck in the positioning hole 511 to form a rotating pair. At this time, the displacement of the short side plate 2 along the extension direction of the guide rail groove 11 is restricted, and it can only rotate around the elastic element.

[0043] When it is necessary to release the locking mechanism 5, a force perpendicular to the elastic element is applied to press it, causing it to deform and retract into the positioning hole 511 until it completely separates from the contact surface of the positioning hole 511. While maintaining the pressed state, the cylinder group 4 drives the piston push rod 43 to retract the short side plate 2 along the guide rail groove 11. After the elastic element completely separates from the positioning hole 511, the pressing force is released, and the elastic element is pressed by the inner wall of the guide rail groove 11 and returns to the state of inward elastic deformation.

[0044] In this embodiment, the elastic element automatically engages with the positioning hole 511 by deformation, eliminating the need for manual pin insertion and improving operational efficiency.

[0045] Example 3

[0046] The foldable box in Embodiment 3 has a structure that is basically the same as that in Embodiment 1. Please refer to [link / reference]. Figure 8-9 The only difference is that the limiting part of the locking mechanism 5 is a slot 512 located at the opening of the guide rail groove 11. The slot 512 is an arc-shaped recessed slot, and the engaging part is a pair of rolling wheels 524 located on both sides of the bottom surface of the short side plate 2. The rolling wheels 524 are coaxially rotatable and are located at one end near the inner side surface 21 of the short side plate 2. Their outer diameter is adapted to the radius of curvature of the slot 512.

[0047] When the cylinder assembly 4 pushes the inner side surface 21 of the short side plate 2 to the receiving opening 12 of the guide rail groove 11, the rolling wheel 524 rolls along the bottom surface of the guide rail groove 11 and falls into the slot 512. At this time, the wheel surface of the rolling wheel 524 is in contact with the arc surface of the slot 512 to form a rotating pair, which restricts the displacement of the side plate 2 along the extension direction of the guide rail groove 11, so that it can only rotate around the rolling wheel 524.

[0048] When it is necessary to release the locking mechanism 5, a vertically upward force is applied to one end of the inner surface 21 of the short side plate 2 to lift the rolling wheel 524 and disengage it from the limit of the slot 512. The wheel surface of the rolling wheel 524 is controlled to be flush with or slightly higher than the bottom surface of the guide rail groove 11 to avoid re-locking. The cylinder group 4 is activated to drive the piston push rod 43 to retract the short side plate 2 along the guide rail groove 11. After the rolling wheel 524 has completely passed the slot 512, the external lifting force is removed, and the rolling wheel 524 resumes rolling contact with the bottom surface of the guide rail groove 11.

[0049] In this embodiment, by setting a pair of coaxially rotating rolling wheels 524, the sliding friction between the side plate 2 and the bottom surface of the guide rail groove 11 is converted into rolling friction, which reduces driving resistance and improves the wear resistance of the device, thus extending its service life.

[0050] Compared to existing technologies, this invention achieves the assembly process from a folded state to a box space through the coordinated action of the cylinder assembly's telescopic movement and the locking mechanism. This high degree of automation eliminates the need for manual assembly, significantly reducing assembly time and saving manpower. The integrated design of the hinged connecting piece and guide rail simplifies the structure and reduces the number of parts, effectively improving ease of use and efficiency. Furthermore, this foldable box is suitable for diverse applications. It can be attached to the roof of a vehicle as an extension space for outdoor travel in RVs or regular vehicles, or used independently as a temporary facility, such as a quickly assembled temporary command post, medical station, or camping kitchen, demonstrating strong practicality.

[0051] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments and claims of this application are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that, unless otherwise stated, “a plurality” means two or more; the terms “first,” “second,” “third,” etc., are used only to distinguish and not to describe a particular order or sequence, nor should they be construed as indicating or implying relative importance. The term “and / or” as used herein refers to and includes any or all possible combinations of one or more associated listed items. When the above description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0052] This utility model is not limited to the above-described embodiments. If any modifications or variations to this utility model do not depart from the spirit and scope of this utility model, and if such modifications and variations fall within the scope of the claims and equivalent technologies of this utility model, then this utility model also intends to include such modifications and variations.

Claims

1. A collapsible box, characterized by include: A rectangular top plate, wherein a parallel guide groove is provided on both sides of the lower surface of the top plate along the long side, and each guide groove forms a storage opening at both ends of the short side of the top plate; Two short side plates are respectively mounted on the lower surface of the top plate in a translatably slidable manner via the parallel guide rail grooves; Two long side panels are respectively hinged to the two long sides of the top plate, and each long side panel is made of two pieces of board hinged together. Two cylinder groups, each consisting of at least one cylinder; the two cylinder groups are respectively connected to the two short side plates to drive the two short side plates to perform translational and rotational movements; Four locking mechanisms are provided. Each locking mechanism includes a limiting part located at the guide rail groove receiving opening and a snap-fit ​​part located on the short side plate. When the cylinder group drives the inner side of the short side plate to move to the guide rail groove receiving opening, the snap-fit ​​part snaps into the limiting part and forms a rotating pair.

2. The foldable box of claim 1, wherein: The snap-fit ​​part includes a pin and corresponding mating holes. The mating holes are located on both sides of the inner side of the short side plate. The limiting part is a positioning hole located at the guide rail groove receiving opening. When the inner side of the short side plate moves to the guide rail groove receiving opening, the pin is inserted into the positioning hole and the mating hole to form a rotating pair.

3. The collapsible box of claim 1, wherein: The limiting part is a positioning hole provided at the guide rail groove receiving opening, and the snap-fit ​​part is an elastic element provided on both sides of the inner side of the short side plate. When the inner side of the short side plate moves to the guide rail groove receiving opening, the elastic element pops out and snaps into the positioning hole to form a rotating pair.

4. The foldable case according to claim 1, characterized in that: The limiting part is a slot provided at the guide rail groove receiving opening, and the locking part is a pair of rolling wheels provided on both sides of the bottom surface of the short side plate. The rolling wheels are coaxially rotatable and are located at one end close to the inner side surface of the short side plate. When the inner side surface of the short side plate moves to the guide rail groove receiving opening, the rolling wheels fall into the slot to form a rotating pair.

5. The foldable case according to any one of claims 1-4, characterized in that: At least one connecting piece is provided on the outer surface of the two short side plates.

6. The foldable case according to claim 5, characterized in that: Each cylinder assembly includes a base and a cylinder. The cylinder includes a cylinder body and a piston rod. The cylinder body is hinged to the base. One end of the piston rod is movably engaged with the cylinder body, and the other end is fixedly connected to the connecting piece.

7. The foldable case according to claim 6, characterized in that: The cylinder assembly consists of two cylinders, and two connecting plates are spaced apart on the outer surface of the short side plate; the piston rod of each cylinder is connected to the two connecting plates of the same side short side plate, and the cylinder assemblies move synchronously to drive the two short side plates to move synchronously along the guide rail groove.

8. The foldable case according to claim 7, characterized in that: The connecting piece is a hinge structure, including a first connecting piece and a second connecting piece, which are rotatably connected by a hinge shaft. The first connecting piece is fixedly connected to the upper surface perpendicular to the outer side surface of the short side plate, and the second connecting piece is connected to the piston rod of the cylinder.

9. The foldable case according to claim 8, characterized in that: It also includes a base plate, which is arranged parallel to the top plate and located below the guide rail groove. The two ends of the long side plate are respectively hinged between the top plate and the base plate. The base of the cylinder assembly is located on the side of the base plate facing the top plate.

10. The foldable case according to claim 9, characterized in that: The top plate is provided with a top protrusion plate perpendicularly along its two long sides. The top protrusion plate is located below the guide rail groove and protrudes in a direction away from the top plate. The bottom plate is provided with a bottom protrusion plate perpendicularly along its two long sides. The bottom protrusion plate protrudes towards the side where the top plate is located. The two ends of the long side plate are respectively hinged to the top protrusion plate and the bottom protrusion plate.

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