Detachable exhibition stand and folding and unfolding method

Abstract

The invention discloses a detachable exhibition stand and a folding and unfolding method, and belongs to the technical field of vehicle-mounted structures. The device comprises a frame main body, a folding plate component and a panel, the folding plate assemblies symmetrical to each other on the two sides are firstly split from original five folding plate assemblies on one side into seven folding plate assemblies on one side, the problem that only a slope top can be formed on the top face after the folding plate assemblies are unfolded is solved, a flat top can be formed after the folding plate assemblies are unfolded at present, and the space is more regular; and secondly, the movable display board track additionally arranged on the top surface can be used as a fixing point for mounting the display board, and an original single large space can be separated to form a plurality of small spaces after the partition boards are mounted.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-mounted structures, and in particular to a detachable exhibition stand and a folding and unfolding method thereof. Background Art

[0002] In order to better develop culture and tourism, vehicle-mounted detachable exhibition stands have appeared on the market.

[0003] In actual use, the existing vehicle-mounted detachable exhibition stand has a complicated folding bottom plate structure, which makes the folding mechanism prone to unsmoothness and jamming during operation. In addition, when the structure is in use, the top surface is a sloped top with limited space (such as Figure 8 As shown in the figure, and after unfolding, the internal space pattern is relatively simple and cannot be divided, which cannot meet the needs of other scenes. Summary of the invention

[0004] The purpose of the present invention is to provide an efficient vehicle-mounted detachable exhibition stand.

[0005] In order to solve the above technical problems, the present invention provides a detachable exhibition stand, comprising a frame body, a folding plate assembly and a panel;

[0006] The frame body includes a telescopic first frame and a second frame;

[0007] The folding plate assembly includes a top plate, a side plate and a bottom plate;

[0008] The top plate comprises a first top plate and a second top plate hinged to each other;

[0009] The side panels include a first side panel, a second side panel and a third side panel which are hinged to each other;

[0010] The bottom plate comprises a first bottom plate and a second bottom plate which are hinged to each other;

[0011] The panel comprises a first panel and a second panel hinged to each other;

[0012] The top of the first frame is connected to the bottom of the second frame through the first top plate, the second top plate, the first side plate, the second side plate, the third side plate, the first bottom plate and the second bottom plate in sequence;

[0013] The first top plate is hinged to the top of the first frame, and the second bottom plate is hinged to the bottom of the second frame;

[0014] One side of the first panel is hinged to one side of the second frame, and the top of the first panel is hinged to the second panel.

[0015] Preferably, the total length of the second top plate and the first side plate, the length of the second side plate, and the total length of the third side plate and the first bottom plate are all the same and smaller than the length of the first top plate, and larger than the length of the second bottom plate;

[0016] The total length of the first top plate and the second top plate is the same as the total length of the first bottom plate and the second bottom plate;

[0017] The first panel and the second panel have the same length.

[0018] Preferably, the number of the folding plate components is two;

[0019] Two folding plate components are symmetrically arranged on the left and right sides of the frame body;

[0020] The first top plates of the two folding plate components are respectively hinged to the top of the left and right sides of the first frame, and the second bottom plates of the two folding plate components are respectively hinged to the bottom of the left and right sides of the second frame.

[0021] Preferably, the number of the panels is four;

[0022] The first panels of the four panels are hinged to the front and rear sides of the second frame respectively.

[0023] Preferably, the first frame is slidably arranged on the second frame;

[0024] A lifting mechanism is provided in the second frame;

[0025] The lifting mechanism is connected to the second frame;

[0026] The lifting mechanism is used to drive the first frame to move on the second frame.

[0027] Preferably, it also includes a fastener;

[0028] The fasteners are used to fix adjacent folding panel assemblies after unfolding.

[0029] Preferably, a staircase board is hingedly connected to the bottom of the front side of the second frame.

[0030] Preferably, movable display panel tracks are provided on the inner sides of the first top plate and the second top plate.

[0031] The present invention also provides a method for folding and unfolding a detachable exhibition stand, including an unfolding method and a folding method, wherein the unfolding method includes the following steps:

[0032] The stair tread rotates toward the front side until it touches the ground;

[0033] The first frame moves upward until it reaches a limit position;

[0034] The first top plate, the flat plate composed of the second top plate and the first side plate, the second side plate, the flat plate composed of the third side plate and the first bottom plate, and the second bottom plate are all rotated outward to expand until the first top plate and the second bottom plate are nearly horizontal;

[0035] The second top plate and the first side plate rotate relative to each other, the second top plate rotates to a horizontal setting, and the first side plate rotates to a vertical setting; the third side plate and the first bottom plate rotate relative to each other, the third side plate rotates to a vertical setting, and the first bottom plate rotates to a horizontal setting; at the same time, the first top plate and the second bottom plate rotate to a horizontal setting, and the second side plate rotates to a vertical setting;

[0036] The first top plate and the second top plate are fixed by fasteners to form the top surface of the booth, the first side plate, the second side plate and the third side plate are fixed by fasteners to form the side surface of the booth, and the first bottom plate and the second bottom plate are fixed by fasteners to form the bottom surface of the booth;

[0037] The first panel rotates outward until it contacts the side of the booth; the second panel flips upward until it contacts the top of the booth; the first panel and the second panel form the front and back of the booth;

[0038] The booth is formed by the booth top, booth sides, booth bottom, booth front and booth back.

[0039] Preferably, the folding method is opposite to the unfolding method, and comprises the following steps:

[0040] The second panel flips downward until it overlaps with the first panel; the first panel rotates inward until it fits with the side of the second frame;

[0041] Remove fasteners;

[0042] Rotate the second top plate and the first side plate to the same plane, and rotate the third side plate and the first bottom plate to the same plane;

[0043] The first frame moves downward until it reaches the initial position; at the same time, the first top plate, the flat plate composed of the second top plate and the first side plate, the second side plate, the flat plate composed of the third side plate and the first bottom plate, and the second bottom plate are all rotated inward to be folded in sequence and fit the side surface of the second frame;

[0044] The stair tread is rotated upward until it fits flush with the front side of the frame body.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] The present invention firstly splits the folding panel components that are symmetrical on both sides from five pieces on one side to seven pieces on one side, thereby solving the problem that the top surface can only form a sloping roof after unfolding. Now, it can form a flat roof after unfolding, and the space is more regular; secondly, the movable display panel track added on the top surface can be used as a fixed point for installing the display panel. After installing the partition, the original single large bay can be separated to form several small spaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings.

[0048] Figure 1 It is a structural diagram of a detachable exhibition stand in state 1;

[0049] Figure 2 It is a structural diagram of a detachable exhibition stand state 2;

[0050] Figure 3 is a structural schematic diagram of a detachable exhibition stand state 4;

[0051] Figure 4 is a structural schematic diagram of a detachable exhibition stand state 4;

[0052] Figure 5 is a schematic diagram of the structure of the detachable exhibition stand in state 5;

[0053] Figure 6 is a schematic diagram of the structure of a detachable exhibition stand in state 6;

[0054] Figure 7 is a schematic diagram of the structure of a detachable exhibition stand in state 7;

[0055] Figure 8 It is a schematic diagram of the structure of the existing exhibition stand with a sloped roof;

[0056] In the figure:

[0057] 1-frame body; 11-first frame; 12-second frame; 2-folding panel assembly; 3-top panel; 31-first top panel; 32-second top panel; 4-side panel; 41-first side panel; 42-second side panel; 43-third side panel; 5-bottom panel; 51-first bottom panel; 52-second bottom panel; 6-panel; 61-first panel; 62-second panel; 7-stair panel; 8-fastener; 9-movable display panel track. DETAILED DESCRIPTION

[0058] Many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention, so the present invention is not limited to the specific implementation disclosed below.

[0059] The terms used in one or more embodiments of this specification are only for the purpose of describing specific embodiments, and are not intended to limit one or more embodiments of this specification. The singular forms of "a", "said" and "the" used in one or more embodiments of this specification and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in one or more embodiments of this specification refers to and includes any or all possible combinations of one or more associated listed items.

[0060] It should be understood that although the terms first, second, etc. may be used to describe various information in one or more embodiments of this specification, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of this specification, the first may also be referred to as the second, and similarly, the second may also be referred to as the first. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0061] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0062] The present invention provides a detachable exhibition stand, comprising a frame body 1, a folding plate assembly 2 and a panel 6;

[0063] The frame body 1 includes a telescopic first frame 11 and a second frame 12;

[0064] The folding plate assembly 2 includes a top plate 3, a side plate 4 and a bottom plate 5;

[0065] The top plate 3 includes a first top plate 31 and a second top plate 32 which are hinged to each other;

[0066] The side panel 4 includes a first side panel 41, a second side panel 42 and a third side panel 43 which are hinged to each other;

[0067] The bottom plate 5 includes a first bottom plate 51 and a second bottom plate 52 which are hinged to each other;

[0068] The panel 6 includes a first panel 61 and a second panel 62 hinged to each other;

[0069] The top of the first frame 11 is connected to the bottom of the second frame 12 through the first top plate 31, the second top plate 32, the first side plate 41, the second side plate 42, the third side plate 43, the first bottom plate 51 and the second bottom plate 52 in sequence;

[0070] The first top plate 31 is hinged to the top of the first frame 11, and the second bottom plate 52 is hinged to the bottom of the second frame 12;

[0071] One side of the first panel 61 is hinged to one side of the second frame 12 , and the top of the first panel 61 is hinged to the second panel 62 .

[0072] Preferably, the total length of the second top plate 32 and the first side plate 41, the length of the second side plate 42, and the total length of the third side plate 43 and the first bottom plate 51 are all the same and less than the length of the first top plate 31, and greater than the length of the second bottom plate 52;

[0073] The total length of the first top plate 31 and the second top plate 32 is the same as the total length of the first bottom plate 51 and the second bottom plate 52 .

[0074] The first panel 61 and the second panel 62 have the same length.

[0075] Preferably, the number of the folding plate components 2 is two;

[0076] Two folding plate components 2 are symmetrically arranged on the left and right sides of the frame body 1;

[0077] The first top plates 31 of the two folding panel assemblies 2 are respectively hinged to the top of the left and right sides of the first frame 11 , and the second bottom plates 52 of the two folding panel assemblies 2 are respectively hinged to the bottom of the left and right sides of the second frame 12 .

[0078] Preferably, the number of the panels 6 is four;

[0079] The first panels 61 of the four panels 6 are hinged to the front and rear sides of the second frame 12 respectively.

[0080] Preferably, the first frame 11 is slidably disposed on the second frame 12;

[0081] A lifting mechanism is provided in the second frame 12;

[0082] The lifting mechanism is connected to the second frame 12;

[0083] The lifting mechanism is used to drive the first frame 11 to move on the second frame 12 .

[0084] Preferably, it also includes a fastener 8;

[0085] The fasteners 8 are used to fix adjacent foldable panel assemblies 2 after they are unfolded.

[0086] Preferably, a staircase board 7 is hingedly connected to the front bottom of the second frame 12 .

[0087] Preferably, movable display panel tracks 9 are provided on the inner sides of the first top plate 31 and the second top plate 32 .

[0088] The present invention also provides a method for folding and unfolding a detachable exhibition stand, including an unfolding method and a folding method, wherein the unfolding method includes the following steps:

[0089] The staircase tread 7 rotates forward until it contacts the ground;

[0090] The first frame 11 moves upward until it reaches a limit position;

[0091] The flat plate composed of the first top plate 31, the second top plate 32 and the first side plate 41, the flat plate composed of the second side plate 42, the third side plate 43 and the first bottom plate 51, and the second bottom plate 52 are all rotated outward to expand until the first top plate 31 and the second bottom plate 52 are both nearly horizontal;

[0092] The second top plate 32 and the first side plate 41 rotate relative to each other, the second top plate 32 rotates to a horizontal setting, and the first side plate 41 rotates to a vertical setting; the third side plate 43 and the first bottom plate 51 rotate relative to each other, the third side plate 43 rotates to a vertical setting, and the first bottom plate 51 rotates to a horizontal setting; at the same time, the first top plate 31 and the second bottom plate 52 rotate to a horizontal setting, and the second side plate 42 rotates to a vertical setting;

[0093] The first top plate 31 and the second top plate 32 are fixed by fasteners 8 to form the top surface of the booth, the first side plate 41, the second side plate 42 and the third side plate 43 are fixed by fasteners 8 to form the side surface of the booth, and the first bottom plate 51 and the second bottom plate 52 are fixed by fasteners 8 to form the bottom surface of the booth;

[0094] The first panel 61 rotates outward until it contacts the side of the booth; the second panel 62 flips upward until it contacts the top surface of the booth; the first panel 61 and the second panel 62 form the front and back of the booth;

[0095] The booth is formed by the booth top, booth sides, booth bottom, booth front and booth back.

[0096] Preferably, the folding method is opposite to the unfolding method, and comprises the following steps:

[0097] The second panel 62 flips downward until it overlaps with the first panel 61; the first panel 61 rotates inward until it fits with the side surface of the second frame 12;

[0098] Removing fastener 8;

[0099] Rotate the second top plate 32 and the first side plate 41 to the same plane, and rotate the third side plate 43 and the first bottom plate 51 to the same plane;

[0100] The first frame 11 moves downward until it reaches the initial position; at the same time, the flat plate composed of the first top plate 31, the second top plate 32 and the first side plate 41, the flat plate composed of the second side plate 42, the third side plate 43 and the first bottom plate 51, and the second bottom plate 52 are all rotated inwards to be folded in sequence and fit the side surface of the second frame 12;

[0101] The staircase board 7 rotates upward until it fits with the front side of the frame body 1 .

[0102] In order to better illustrate the technical effect of the present invention, the present invention provides the following specific embodiments to illustrate the above technical process:

[0103] Embodiment 1: A vehicle-mounted detachable exhibition stand, which is a detachable digital intelligent semi-automatic building structure, is placed on the frame of a transport vehicle;

[0104] A vehicle-mounted unloadable exhibition stand includes a frame body 1, which is a rectangular structure. Two mutually symmetrical folding plate assemblies 2 are arranged inside the frame body 1 (each side is composed of 7 folding plates, and the folding plates are respectively a first top plate 31, a second top plate 32, a first side plate 41, a second side plate 42, a third side plate 43, a first bottom plate 51 and a second bottom plate 52). A driving mechanism is arranged inside the frame body 1, and the driving mechanism is connected to the mutually symmetrical folding plates. After unfolding, a movable exhibition plate track 9 is arranged on the top surface of the exhibition stand to fix the movable exhibition plate, so as to adapt to space division in various scenes;

[0105] The total length of the second top panel 32 and the first side panel 41, the length of the second side panel 42, and the total length of the third side panel 43 and the first bottom panel 51 are all the same and can be folded in sequence, and are all smaller than the length of the first top panel 31 and larger than the length of the second bottom panel 52; the total length of the first top panel 31 and the second top panel 32 is the same as the total length of the first bottom panel 51 and the second bottom panel 52.

[0106] In this embodiment, the length of the first top plate 31 is 2.9 m, the length of the second top plate 32 is 1.2 m, the length of the first side plate 41 is 1.2 m, the length of the second side plate 42 is 2.4 m, the length of the third side plate 43 is 0.6 m, the length of the first bottom plate 51 is 1.8 m, and the length of the second bottom plate 52 is 2.3 m.

[0107] Two base shells corresponding to each other are fixedly arranged on the lower surface of the frame body 1, and a double-axis motor is fixedly arranged inside the base shell. The two output shafts of the double-axis motor are fixedly connected to drive rods, and the ends of the two drive rods away from each other are fixedly connected to drive gears. The inner bottom wall of the frame body is rotatably connected to four lifting screws, and the lifting screws are symmetrically distributed on the surface of the frame body in groups of two, and the surface of each group of lifting screws is threadedly connected to a drive block, and the folding plate is fixedly connected between each group of two drive blocks. The bottom end of the lifting screw extends to the inside of the base shell and is fixed with a driven gear, and the drive gear is meshed with the driven gear.

[0108] The present invention provides a method for folding and unfolding a detachable exhibition stand, including an unfolding method and a folding method;

[0109] 1. The expansion method comprises the following steps:

[0110] Initially, the detachable booth is in the initial state, such as Figure 1 As shown;

[0111] The staircase tread 7 rotates forward until it contacts the ground; Figure 2 As shown;

[0112] The first frame 11 moves upward until it reaches the limit position; Figure 3 As shown;

[0113] The flat plate composed of the first top plate 31, the second top plate 32 and the first side plate 41, the flat plate composed of the second side plate 42, the third side plate 43 and the first bottom plate 51, and the second bottom plate 52 are all rotated outward to expand until the first top plate 31 and the second bottom plate 52 are close to horizontal (at this time, the first top plate 31 and the second bottom plate 52 are slightly higher than the horizontal plane); Figure 4 As shown;

[0114] The second top plate 32 and the first side plate 41 rotate relative to each other, the second top plate 32 rotates to a horizontal setting, and the first side plate 41 rotates to a vertical setting; the third side plate 43 and the first bottom plate 51 rotate relative to each other, the third side plate 43 rotates to a vertical setting, and the first bottom plate 51 rotates to a horizontal setting; at the same time, the first top plate 31 and the second bottom plate 52 rotate to a horizontal setting, and the second side plate 42 rotates to a vertical setting; at the same time, the first top plate 31 and the second bottom plate 52 are both rotated to a horizontal setting; Figure 5 As shown;

[0115] The first top plate 31 and the second top plate 32 are fixed by fasteners 8 to form the top surface of the booth, the first side plate 41, the second side plate 42 and the third side plate 43 are fixed by fasteners 8 to form the side surface of the booth, and the first bottom plate 51 and the second bottom plate 52 are fixed by fasteners 8 to form the bottom surface of the booth;

[0116] The first panel 61 rotates outward until it contacts the side of the booth; the second panel 62 flips upward until it contacts the top of the booth; the first panel 61 and the second panel 62 form the front and back of the booth; Figure 6 As shown;

[0117] The booth is formed by the booth top, booth side, booth bottom, booth front and booth back. Figure 7 shown.

[0118] 2. The folding method is opposite to the unfolding method and includes the following steps:

[0119] The second panel 62 flips downward until it overlaps with the first panel 61; the first panel 61 rotates inward until it fits with the side surface of the second frame 12;

[0120] Removing fastener 8;

[0121] Rotate the second top plate 32 and the first side plate 41 to the same plane, and rotate the third side plate 43 and the first bottom plate 51 to the same plane;

[0122] The first frame 11 moves downward until it reaches the initial position; at the same time, the flat plate composed of the first top plate 31, the second top plate 32 and the first side plate 41, the flat plate composed of the second side plate 42, the third side plate 43 and the first bottom plate 51, and the second bottom plate 52 are all rotated inwards to be folded in sequence and fit the side surface of the second frame 12;

[0123] The staircase board 7 is rotated upward until it fits with the front side of the frame body 1;

[0124] The device shrinks and folds into a rectangular structure.

[0125] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A detachable exhibition stand, characterized in that: It comprises a frame body (1), a foldable panel assembly (2) and a panel (6); The frame body (1) comprises a telescopic first frame (11) and a second frame (12); The foldable panel assembly (2) comprises a top panel (3), a side panel (4) and a bottom panel (5); The top plate (3) comprises a first top plate (31) and a second top plate (32) which are hinged to each other; The side panel (4) comprises a first side panel (41), a second side panel (42) and a third side panel (43) which are hinged to each other; The bottom plate (5) comprises a first bottom plate (51) and a second bottom plate (52) which are hinged to each other; The panel (6) comprises a first panel (61) and a second panel (62) which are hinged to each other; The top of the first frame (11) is connected to the bottom of the second frame (12) through a first top plate (31), a second top plate (32), a first side plate (41), a second side plate (42), a third side plate (43), a first bottom plate (51) and a second bottom plate (52) in sequence; The first top plate (31) is hinged to the top of the first frame (11), and the second bottom plate (52) is hinged to the bottom of the second frame (12); One side of the first panel (61) is hinged to one side of the second frame (12), and the top of the first panel (61) is hinged to the second panel (62).

2. The detachable exhibition stand according to claim 1, characterized in that: The total length of the second top plate (32) and the first side plate (41), the length of the second side plate (42), and the total length of the third side plate (43) and the first bottom plate (51) are all the same and are less than the length of the first top plate (31), and are greater than the length of the second bottom plate (52); The total length of the first top plate (31) and the second top plate (32) is the same as the total length of the first bottom plate (51) and the second bottom plate (52); The first panel (61) and the second panel (62) have the same length.

3. The detachable exhibition stand according to claim 2, characterized in that: The number of the folding plate components (2) is two; Two folding plate components (2) are symmetrically arranged on the left and right sides of the frame body (1); The first top plates (31) of the two folding plate assemblies (2) are respectively hinged to the tops on the left and right sides of the first frame (11), and the second bottom plates (52) of the two folding plate assemblies (2) are respectively hinged to the bottoms on the left and right sides of the second frame (12).

4. The detachable exhibition stand according to claim 3, characterized in that: The number of the panels (6) is four; The first panels (61) of the four panels (6) are respectively hinged to the front and rear sides of the second frame (12).

5. The detachable exhibition stand according to claim 4, characterized in that: The first frame (11) is slidably arranged on the second frame (12); A lifting mechanism is arranged in the second frame (12); The lifting mechanism is connected to the second frame (12); The lifting mechanism is used to drive the first frame (11) to move on the second frame (12).

6. The detachable exhibition stand according to claim 5, characterized in that: Also includes a fastener (8); The fasteners (8) are used to fix adjacent foldable panel assemblies (2) after they are unfolded.

7. The detachable exhibition stand according to claim 6, characterized in that: A staircase board (7) is hingedly connected to the front bottom of the second frame (12).

8. The detachable exhibition stand according to claim 7, characterized in that: Movable display panel tracks (9) are provided on the inner sides of the first top plate (31) and the second top plate (32).

9. A method for folding and unfolding a detachable exhibition stand, wherein the exhibition stand is a detachable exhibition stand as claimed in any one of claims 1 to 8, characterized in that: It includes an unfolding method and a folding method, and the unfolding method specifically includes the following steps: The staircase board (7) rotates forward until it contacts the ground; The first frame (11) moves upward until it reaches a limit position; The flat plate composed of the first top plate (31), the second top plate (32) and the first side plate (41), the flat plate composed of the second side plate (42), the third side plate (43) and the first bottom plate (51), and the second bottom plate (52) are all rotated outward to expand until the first top plate (31) and the second bottom plate (52) are nearly horizontal; The second top plate (32) and the first side plate (41) rotate relative to each other, the second top plate (32) rotates to a horizontal setting, and the first side plate (41) rotates to a vertical setting; the third side plate (43) and the first bottom plate (51) rotate relative to each other, the third side plate (43) rotates to a vertical setting, and the first bottom plate (51) rotates to a horizontal setting; at the same time, the first top plate (31) and the second bottom plate (52) rotate to a horizontal setting, and the second side plate (42) rotates to a vertical setting; The first top plate (31) and the second top plate (32) are fixed by fasteners (8) to form the top surface of the booth, the first side plate (41), the second side plate (42) and the third side plate (43) are fixed by fasteners (8) to form the side surface of the booth, and the first bottom plate (51) and the second bottom plate (52) are fixed by fasteners (8) to form the bottom surface of the booth; The first panel (61) rotates outward until it contacts the side of the booth; the second panel (62) flips upward until it contacts the top surface of the booth; the first panel (61) and the second panel (62) form the front and back of the booth; The booth is formed by the booth top, booth sides, booth bottom, booth front and booth back.

10. The method for folding and unfolding a detachable exhibition stand according to claim 9, characterized in that: The folding method is opposite to the unfolding method and includes the following steps: The second panel (62) flips downward until it overlaps with the first panel (61); the first panel (61) rotates inward until it fits with the side surface of the second frame (12); Removing the fastener (8); The second top plate (32) and the first side plate (41) are rotated to the same plane, and the third side plate (43) and the first bottom plate (51) are rotated to the same plane; The first frame (11) moves downward until it reaches the initial position; at the same time, the flat plate composed of the first top plate (31), the second top plate (32) and the first side plate (41), the flat plate composed of the second side plate (42), the third side plate (43) and the first bottom plate (51), and the second bottom plate (52) are all rotated inwards to be folded in sequence and fit with the side surface of the second frame (12); The staircase board (7) rotates upward until it fits with the front side of the frame body (1).

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