Double-support reversely-folded lamp box

Abstract

The utility model relates to the technical field of exhibition frames, in particular to a double-support reversely-folded lamp box which comprises two supports located between two transverse frames, and one end of each supporting rod is connected with the corresponding support through a foldable structure. The folding position of the supporting rod connected with the left supporting seat is located on one side of the supporting seat, and the folding position of the supporting rod connected with the right supporting seat is located on the other side of the supporting seat. The stability of the lamp box is improved, each supporting rod is always connected with the corresponding support in the assembling and disassembling process, disorder and loss of the disassembled supporting rods are avoided, the supporting rods can be rapidly switched from the folding position to the unfolding position, the assembling and disassembling process is simplified, the two supports can move reversely in the disassembling process, and the assembling and disassembling efficiency is improved. Therefore, the structural compactness of an integral module formed by the folded supporting rod and the support is improved, and the occupied space is reduced.

Description

Technical Field

[0001] This utility model relates to the field of exhibition frame technology, and in particular to a double-supported reverse-folding lightbox. Background Technology

[0002] Foldable light boxes are widely used in various fields such as product display and brand promotion. In the design and actual use of foldable light boxes, their folding performance plays a crucial role. Thanks to the ingenious folding design, the light box can be greatly reduced in size, making it easy to carry and transport. This feature is especially important in occasions where the display location needs to be changed frequently.

[0003] When the span of a lightbox is large, multiple support rods are often designed inside. For example, a detachable lightbox disclosed in Chinese Patent Publication No. CN220509652U uses a design of six support rods and two cross-shaped connectors. The support rods are installed by plugging them in with the connectors. This means that when assembling on site, operators must follow a specific order and steps to assemble these support rods one by one. Such an operation process is not only complicated and cumbersome, but may also cause structural instability due to insufficient tightness of the support rods, affecting the overall stability of the lightbox. More importantly, these support rods are easy to scatter, leading to disarray and loss of support rods. Utility Model Content

[0004] The technical problem to be solved by this utility model is: in order to solve the problem that the support rods inside the existing folding light boxes adopt a plug-in structure, which leads to complicated assembly and disassembly, and the support rods are easy to get confused and lost, a double-support reverse folding light box is provided.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a double-support reverse folding light box, including a pair of vertical frames and a pair of horizontal frames, the two ends of the upper horizontal frame are respectively connected to the upper ends of the two vertical frames, the two ends of the lower horizontal frame are respectively connected to the upper ends of the two vertical frames, and also includes two supports located between the two horizontal frames and spaced apart in the left and right direction, the two supports being the left support and the right support.

[0006] The horizontal frame includes at least three horizontal segments arranged in the left-right direction, and two adjacent horizontal segments are fixedly connected by a middle straight member.

[0007] The vertical frame includes two vertical segments and a vertical connector connecting the two vertical segments;

[0008] The vertical connector on the left and the middle straight member on the left side of at least one horizontal frame are each equipped with a strut in the unfolded position corresponding to the left support. The vertical connector on the right and the middle straight member on the right side of at least one horizontal frame are each equipped with a strut in the unfolded position corresponding to the right support. The left support and the right support are equipped with struts in the unfolded position.

[0009] One end of each strut is connected to the support via a foldable structure, which allows the strut to move between a folded position and an unfolded position, and can lock the strut in the unfolded position.

[0010] The folded position of the strut connected to the left support is located on one side of the support, and the folded position of the strut connected to the right support is located on the other side of the support.

[0011] Furthermore, two adjacent support rods on the same support are perpendicular to each other, and the horizontal frame and the vertical frame are perpendicular to each other.

[0012] Furthermore, the two vertical segments of the same vertical frame are hinged together by a vertical connector;

[0013] The two ends of the upper horizontal frame are hinged to the upper ends of the two vertical frames via upper corner connectors.

[0014] The two ends of the lower horizontal frame are hinged to the upper ends of the two vertical frames via lower corner connectors.

[0015] Furthermore, the foldable structure of the strut connected to the left support is at least configured to allow the strut to rotate in a first direction;

[0016] The foldable structure of the strut connected to the right support is at least configured to allow the strut to rotate in the second direction;

[0017] The first direction and the second direction are opposite.

[0018] Furthermore, the foldable structure of the strut connected to the left support is configured to allow the strut to slide and rotate in the first direction;

[0019] The foldable structure of the strut connected to the right support is configured to allow the strut to slide and rotate in the second direction.

[0020] Furthermore, each of the support rods corresponds one-to-one with a foldable structure;

[0021] The foldable structure includes an inner connector and an outer connector located on one side of the support. The inner connector has a locking protrusion elastically connected to it. The end of the support rod near the inner connector is fixedly connected to the inner connector. The outer connector has a locking hole that matches the locking protrusion.

[0022] The inner and outer connectors are movably connected to allow the cross strut to move between the folded and unfolded positions. When the locking protrusion elastically engages with the locking hole, the strut is locked in the unfolded position.

[0023] Furthermore, the outer connector has a socket that matches the inner connector. The inner connector is slidably installed in the socket along the length of the support rod. A sliding groove is provided on one or both sides of the socket along the sliding direction of the support rod. A sliding post protrudes from the outer wall of the inner connector and matches the sliding groove. The sliding post is slidably and rotatably installed in the sliding groove.

[0024] The outer connector has a notch at the end away from the support. The notch is located on one side of the outer connector and is used to accommodate the inner connector of the strut in the folded position. The slide extends to the outside of the insertion hole, and the outer end of the slide is opposite to the notch. The notch on the left support is located on one side of the strut, and the notch on the right support is located on the other side of the strut.

[0025] When the locking protrusion elastically engages with the lock hole, the sliding pin is located inside the insertion hole.

[0026] Furthermore, the outer connector is fitted with a locking sleeve, which is fixedly connected to the outer connector, and the lock hole is formed on the locking sleeve;

[0027] The portion of the external connector that is directly opposite the lock hole of the lock sleeve has a travel groove that connects to the insertion hole, and the travel groove extends to the notch.

[0028] Furthermore, the inner connector is a hollow structure, and a window extends outward from the inner wall of the inner connector. An elastic cantilever is fixed to one side of the window, and the locking protrusion is formed on the outer side of the free end of the cantilever.

[0029] Furthermore, both the horizontal and vertical sides are hollow structures;

[0030] The vertical connector includes a connecting seat and two movable components respectively hinged to both ends of the connecting seat, with the movable components at both ends of the connecting seat respectively inserted into the corresponding two vertical side segments;

[0031] The two ends of the intermediate straight section are respectively inserted into the two adjacent horizontal side sections;

[0032] A base plate is fixed to the lower surface of the horizontal frame, and the base plate intersects with the horizontal frame.

[0033] The beneficial effects of this utility model are as follows: This utility model connects the horizontal and vertical frames together through two supports and multiple struts, enabling the struts to distribute and resist external wind or pressure on the lightbox, thereby improving the stability of the lightbox. The foldable structure can lock the struts in the unfolded position, further improving the stability of the lightbox during use and preventing the struts from accidentally folding or falling off due to external forces. At the same time, during the assembly and disassembly process, each strut remains connected to its corresponding support, avoiding confusion and loss of the struts after disassembly. It can also quickly switch from the folded position to the unfolded position, simplifying the assembly and disassembly process of the lightbox. Moreover, during disassembly, the two supports can move in opposite directions, and the struts of the two supports can be folded to opposite positions, thereby improving the structural compactness of the overall module formed by the folded struts and supports, making it easy to carry and reducing space occupation.

[0034] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] Figure 1 This is a three-dimensional schematic diagram of the double-support reverse-folding light box of this utility model;

[0037] Figure 2 It is a three-dimensional diagram of the horizontal and vertical borders during the folding process;

[0038] Figure 3 This is a three-dimensional schematic diagram of the strut in the folded position;

[0039] Figure 4 This is a 3D diagram of the horizontal and vertical borders after they have been folded.

[0040] Figure 5 It is a longitudinal section view of the strut in the extended position in conjunction with the support;

[0041] Figure 6 yes Figure 5 Schematic diagram of the sectional view along the central AA direction;

[0042] Figure 7 This is a three-dimensional schematic diagram of the internal connector;

[0043] Figure 8 This is a schematic diagram showing the fixed connection between the inner connector and the inner end of the strut;

[0044] Figure 9 This is a three-dimensional schematic diagram of the support;

[0045] Figure 10 This is a three-dimensional schematic diagram of the fit between the support concealed locking sleeve and the inner connector;

[0046] In the diagram: 1. Vertical border, 11. Vertical side segment, 12. Vertical connector;

[0047] 2. Horizontal border; 21. Horizontal edge segment; 22. Middle straight section;

[0048] 3. Support; 31. External connector; 311. Insertion hole; 312. Slide groove; 313. Notch; 314. Stroke groove; 32. Locking sleeve; 321. Locking hole; 3a. Left support; 3b. Right support.

[0049] 4. Support rod; 41. Inner joint; 411. Sliding column; 412. Cantilever; 413. Locking protrusion;

[0050] 5. Upper corner connector;

[0051] 6. Lower corner connector. Detailed Implementation

[0052] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention. Therefore, they only show the components, orientations, and references (e.g., up, down, left, right, etc.) relevant to the present invention and are intended only to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be restrictive, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0053] like Figure 1-10 As shown, a double-support reverse folding lightbox includes a pair of vertical frames 1 and a pair of horizontal frames 2. The two ends of the upper horizontal frame 2 are connected to the upper ends of the two vertical frames 1 through upper corner connectors 5, and the two ends of the lower horizontal frame 2 are connected to the upper ends of the two vertical frames 1 through lower corner connectors 6.

[0054] The two horizontal frames 2 are of equal length and parallel to each other, and the two vertical frames 1 are of equal length and parallel to each other. The two ends of the upper horizontal frame 2 are connected to the upper ends of the two vertical frames 1 through the upper corner connector 5, and the two ends of the lower horizontal frame 2 are connected to the lower ends of the two vertical frames 1 through the lower corner connector 6. The light source can be arranged on the two horizontal frames 2.

[0055] It also includes two supports 3 located between the two horizontal frames 2 and spaced apart in the left and right direction, namely the left support 3a and the right support 3b;

[0056] The horizontal frame 2 includes at least three horizontal segments 21 arranged in the left and right direction. Adjacent horizontal segments 21 are fixedly connected by a middle straight member 22. In this embodiment, the same horizontal frame 2 includes three horizontal segments 21 and two middle straight members 22. The lengths of the three horizontal segments 21 can be equal.

[0057] The vertical frame 1 includes two vertical side segments 11 and a vertical connector 12 connecting the two vertical side segments 11; specifically, the two vertical side segments 11 connected by the vertical connector 12 are of equal length.

[0058] The upper end of the vertical segment 11 above the left vertical frame 1 and the left end of the leftmost horizontal segment 21 of the upper horizontal frame 2 are connected by the upper corner connector 5. The upper end of the vertical segment 11 above the right vertical frame 1 and the right end of the rightmost horizontal segment 21 of the upper horizontal frame 2 are connected by the upper corner connector 5.

[0059] The lower end of the vertical segment 11 below the left vertical frame 1 and the left end of the leftmost horizontal segment 21 of the lower horizontal frame 2 are connected by a lower corner connector 6. The lower end of the vertical segment 11 below the right vertical frame 1 and the right end of the rightmost horizontal segment 21 of the lower horizontal frame 2 are connected by a lower corner connector 6.

[0060] The left vertical connector 12 and the left middle straight member 22 of the horizontal frame 2 are all equipped with a support rod 4 in the unfolded position between the left support 3a and the left vertical connector 12, the left middle straight member 22 of the upper horizontal frame 2 and the left middle straight member 22 of the lower horizontal frame 2 are all equipped with a support rod 4 in the unfolded position between the left vertical connector 12, the left middle straight member 22 of the upper horizontal frame 2 and the left middle straight member 22 of the lower horizontal frame 2 and the left support 3a.

[0061] The right vertical connector 12 and the right middle straight member 22 of the right side of the horizontal frame 2 are all equipped with a support rod 4 in the unfolded position between them and the right support 3b, or the right vertical connector 12, the right middle straight member 22 of the upper horizontal frame 2 and the right middle straight member 22 of the lower horizontal frame 2 are all equipped with a support rod 4 in the unfolded position between them and the right support 3b.

[0062] A support rod 4 in the unfolded position is installed between the left support 3a and the right support 3b respectively;

[0063] Each vertical connector 12 and the intermediate straight member 22 can be detachably fixedly connected to the corresponding support rod 4 using a structure such as a lock or clamp.

[0064] One end of each of the support rods 4 is connected to the support 3 via a foldable structure. The foldable structure allows the support rod 4 to move between the folded position and the unfolded position, and can lock the support rod 4 in the unfolded position.

[0065] In this embodiment, the folded position of the support rod 4 refers to the state in which the total length between the support rods 4 on both sides of the support 3 becomes shorter. That is, when the support rod 4 is in the unfolded position, the distance between the outer ends of the support rods 4 on both sides of the support 3 is L1, and when the support rod 4 is in the folded position, the distance between the outer ends of the support rods 4 on both sides of the support 3 is L2, where L1 is greater than L2.

[0066] The folded position of the strut 4 connected to the left support 3a is located on one side of the support 3, and the folded position of the strut 4 connected to the right support 3b is located on the other side of the support 3.

[0067] In this embodiment, two supports 3 and multiple struts 4 are used to connect the horizontal frame 2 and the vertical frame 1 together. This allows the struts 4 to distribute and resist external wind or pressure on the lightbox, improving the stability of the lightbox. The foldable structure can lock the struts in the unfolded position, further improving the stability of the lightbox during use and preventing the struts 4 from accidentally folding or falling off due to external forces. At the same time, during the assembly and disassembly process, each strut 4 remains connected to its corresponding support 3, avoiding confusion and loss of the struts 4 after disassembly. It can also be quickly switched from the folded position to the unfolded position, simplifying the assembly and disassembly process of the lightbox. Moreover, during disassembly, the two supports 3 can move in opposite directions, and the struts 4 of the two supports 3 can be folded to opposite positions, thereby improving the structural compactness of the overall module formed by the folded struts 4 and supports 3, making it easy to carry and reducing space occupation.

[0068] In some examples, two adjacent struts 4 on the same support 3 are perpendicular to each other, the horizontal frame 2 and the vertical frame 1 are perpendicular to each other, and the struts 4 around the support 3 can be arranged at 90° intervals to form two cross structures, connecting a pair of horizontal frames 2 and a pair of vertical frames 1 into one unit with two internal cross structures.

[0069] In some examples, the two vertical segments 11 of the same vertical frame 1 are hinged by a vertical connector 12, so that the vertical frame 1 itself can also be folded in half;

[0070] The two ends of the upper horizontal frame 2 are respectively hinged to the upper ends of the two vertical frames 1 through the upper corner connector 5, and the two ends of the lower horizontal frame 2 are respectively hinged to the upper ends of the two vertical frames 1 through the lower corner connector 6; thus, the vertical frames 1 can be rotated and folded relative to the horizontal frame 2.

[0071] In some examples, the foldable structure of the strut 4 connected to the left support 3a is at least configured to allow the strut 4 to rotate in a first direction;

[0072] The foldable structure of the strut 4 connected to the right support 3b is at least configured to allow the strut 4 to rotate in the second direction;

[0073] The first direction and the second direction are opposite;

[0074] By folding the struts 4 of the left support 3a and the right support 3b in a way that they rotate in opposite directions, the space occupied by the struts 4 and the support 3 can be greatly reduced.

[0075] In some examples, the foldable structure of the strut 4 connected to the left support 3a is configured to allow the strut 4 to slide and rotate in a first direction;

[0076] The foldable structure of the strut 4 connected to the right support 3b is configured to allow the strut 4 to slide and rotate in the second direction.

[0077] In some examples, the strut 4 corresponds one-to-one with the foldable structure;

[0078] The foldable structure includes an inner connector 1 and an outer connector 31 located on one side of the support 3. A locking protrusion 413 is elastically connected to the inner connector 41. The end of the support rod 4 near the inner connector 41 is fixedly connected to the inner connector 41. The outer connector 31 has a locking hole 321 that matches the locking protrusion 413.

[0079] The inner connector 41 is movably connected to the outer connector 31 to allow the cross strut 4 to move between the folded position and the unfolded position. When the locking protrusion 413 elastically engages with the locking hole 321, the strut 4 is locked in the unfolded position.

[0080] Since the inner connector 41 is movably connected to the outer connector 31, when the locking protrusion 413 is not engaged in the lock hole 321, the inner connector 41 can move along the set trajectory until the locking protrusion 413 elastically engages in the lock hole 321, at which point the inner connector 41 will be fixed. When folding is required, the operator only needs to manually press the locking protrusion 413 to disengage it from the lock hole 321, and the inner connector 41 will resume moving along the set trajectory. In other words, at this time, the inner connector 41 can move between the folded position and the unfolded position.

[0081] In some examples, the outer connector 31 has a socket 311 that matches the inner connector 41. The inner connector 41 is slidably installed in the socket 311 along the length of the support rod 4. A sliding groove 312 is provided on one or both sides of the socket 311 along the sliding direction of the support rod 4. A sliding post 411 that matches the sliding groove 312 protrudes from the outer wall of the inner connector 41. The sliding post 411 is slidably and rotatably installed in the sliding groove 312.

[0082] The outer connector 31 has a notch 313 at the end away from the support 3. The notch 313 is located on one side of the outer connector 31 and is used to accommodate the inner connector 41 of the support rod 4 in the folded position. The slide groove 312 extends to the outside of the insertion hole 311, and the outer end of the slide groove 312 is opposite to the notch 313. The notch 313 on the left support 3a is located on one side of the support rod 4, and the notch 313 on the right support 3b is located on the other side of the support rod 4.

[0083] When the locking protrusion 413 is elastically engaged in the lock hole 321, the sliding pin 411 is located in the insertion hole 311.

[0084] By utilizing the design that the inner connector 41 is precisely inserted into the insertion hole 311 when the support rod 4 is in the unfolded position, the support rod in the unfolded position can only slide, thus preventing the support rod 4 from deflecting relative to the support 3 in the unfolded position and enhancing the stability of the structure. When the locking protrusion 413 is pressed out of the locking hole 321, the support rod 4 can slide outward until the sliding column 411 moves along the sliding groove 312 to the outside of the insertion hole 311. Then, the support rod 4 is rotated so that the inner connector 41 of the support rod 4 rotates into the notch 313, and finally the support rod 4 reaches the folded position.

[0085] In some examples, the outer connector 31 is fitted with a locking sleeve 32, which is fixedly connected to the outer connector 31, and the locking hole 321 is formed on the locking sleeve 32; the locking sleeve 32 can improve the structural strength of the outer connector 31 and also facilitates the formation of the locking hole 321;

[0086] The portion of the outer connector 31 that is directly opposite the lock hole 321 of the lock sleeve 32 has a travel groove 314 that is connected to the insertion hole 311. The travel groove 314 extends to the notch 313. After the locking protrusion 413 disengages from the lock hole 321, it can reach the notch 313 along the travel groove 314 to improve the sliding flexibility of the inner connector 41 and avoid jamming.

[0087] In some examples, the inner connector 41 is a hollow structure with a window extending outward from the inner wall of the inner connector 41. One side of the window is fixed to an elastic cantilever 412, and the locking protrusion 413 is formed on the outer side of the free end of the cantilever 412, thereby realizing that the locking protrusion 413 is elastically connected to the inner connector 41. The inner connector 41 can also be elastically connected to the locking protrusion 413 by installing elastic elements such as helical springs and metal spring sheets.

[0088] In some examples, both the horizontal segment 21 and the vertical segment 11 are hollow structures;

[0089] The vertical connector 12 includes a connecting seat and two movable components respectively hinged to both ends of the connecting seat. The movable components at both ends of the connecting seat are respectively inserted into the corresponding two vertical side segments 11. The movable components can also be elastically engaged with the vertical side segments 11 to facilitate quick assembly and disassembly between the movable components and the vertical side segments 11, and to ensure a certain degree of connection stability.

[0090] The two ends of the intermediate straight section 22 are respectively inserted into the two adjacent horizontal sections 21 to fix the two adjacent horizontal sections 21 together.

[0091] A base plate 7 is fixed to the lower surface of the lower horizontal frame 2. For example, a base plate 7 is fixed to both ends of the lower surface of the lower horizontal frame 2. The base plate 7 can be, but is not limited to, being fixedly connected to the horizontal frame 2 by means of screws, plugs, snaps, etc. The base plate 7 intersects with the horizontal frame 2. Preferably, the base plate 7 is perpendicular to the horizontal frame 2.

[0092] The working principle of the above-mentioned double-support reverse-folding lightbox is as follows:

[0093] Folding process:

[0094] like Figure 2 As shown, the four middle straight sections 22 are removed from the two adjacent horizontal sections 21 respectively; then each horizontal section 21 and vertical section 11 are rotated and folded together in sequence.

[0095] like Figure 3 As shown, when folding the support rod, first press the locking protrusion 413 until it is disengaged from the locking hole 321, then slide the support rod 4 outward until the sliding column 411 on the support rod 4 moves along the sliding groove 312 to the outside of the insertion hole 311. Then rotate the support rod 4 on the left support 3a in the first direction and rotate the support rod 4 on the right support 3b in the second direction opposite to the first direction. The left support 3a and the right support 3b move in opposite directions so that the inner joint 41 of each support rod 4 is located in the corresponding notch 313, and finally each support rod 4 reaches the folding position.

[0096] Unfolding process:

[0097] Rotate the inner connectors 41 of the left support 3a and the right support 3b in opposite directions respectively, and then insert the inner connector 41 into the insertion hole 311 of the outer connector 31 until the locking protrusion 413 is engaged in the locking hole 321, so that the support rod 4 is locked in the unfolded position. Connect each support rod 4 to the corresponding vertical connecting piece 12 and the middle straight piece 22, and insert the movable components at both ends of the four middle straight pieces 22 into the two adjacent horizontal connecting sections respectively, so that the light box can be unfolded.

[0098] The above description, based on the preferred embodiments of this utility model, provides inspiration. Those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification but must be determined according to the claims.

Claims

1. A double-supported, reverse-folding lightbox, comprising a pair of vertical frames (1) and a pair of horizontal frames (2), wherein the two ends of the upper horizontal frame (2) are respectively connected to the upper ends of the two vertical frames (1), and the two ends of the lower horizontal frame (2) are respectively connected to the upper ends of the two vertical frames (1), characterized in that: It also includes two supports (3) located between the two horizontal frames (2) and spaced apart in the left and right directions, the two supports (3) being the left support (3a) and the right support (3b); The horizontal frame (2) includes at least three horizontal side segments (21) arranged in the left and right direction, and two adjacent horizontal side segments (21) are fixedly connected by a middle straight member (22); The vertical frame (1) includes two vertical side segments (11) and a vertical connector (12) connecting the two vertical side segments (11). The left vertical connector (12) and at least one horizontal frame (2) are each equipped with a strut (4) in the unfolded position between the left support (3a) and the middle straight member (22) on the left side. The right vertical connector (12) and at least one horizontal frame (2) are each equipped with a strut (4) in the unfolded position between the right support (3b). The left support (3a) and the right support (3b) are each equipped with a strut (4) in the unfolded position. One end of each of the support rods (4) is connected to the support (3) through a foldable structure. The foldable structure is used to allow the support rods (4) to move between the folded position and the unfolded position, and to lock the support rods (4) in the unfolded position. The folded position of the strut (4) connected to the left support (3a) is located on one side of the support (3), and the folded position of the strut (4) connected to the right support (3b) is located on the other side of the support (3).

2. The double-support reverse-folding lightbox according to claim 1, characterized in that: Two adjacent struts (4) on the same support (3) are perpendicular to each other, and the horizontal frame (2) and the vertical frame (1) are perpendicular to each other.

3. The double-supported, reverse-folding lightbox according to claim 1, characterized in that: The two vertical segments (11) of the same vertical frame (1) are hinged together by a vertical connector (12); The two ends of the upper horizontal frame (2) are respectively hinged to the upper ends of the two vertical frames (1) through the upper corner connector (5); The two ends of the lower horizontal frame (2) are respectively hinged to the upper ends of the two vertical frames (1) through the lower corner connector (6).

4. The double-support reverse-folding lightbox according to claim 1, characterized in that: The foldable structure of the strut (4) connected to the left support (3a) is at least configured to allow the strut (4) to rotate in a first direction; The foldable structure of the strut (4) connected to the right support (3b) is at least configured to allow the strut (4) to rotate in the second direction; The first direction and the second direction are opposite.

5. The double-support reverse-folding lightbox according to claim 4, characterized in that: The foldable structure of the strut (4) connected to the left support (3a) is configured to allow the strut (4) to slide and rotate in a first direction; The foldable structure of the strut (4) connected to the right support (3b) is configured to allow the strut (4) to slide and rotate in the second direction.

6. The double-supported reverse-folding lightbox according to claim 5, characterized in that: The support rod (4) corresponds one-to-one with the foldable structure; The foldable structure includes an inner connector (41) and an outer connector (31) located on one side of the support (3). The inner connector (41) is elastically connected with a locking protrusion (413). The end of the support rod (4) near the inner connector (41) is fixedly connected to the inner connector (41). The outer connector (31) has a locking hole (321) that matches the locking protrusion (413). The inner connector (41) is movably connected to the outer connector (31) to allow the cross strut (4) to move between the folded position and the unfolded position. When the locking protrusion (413) elastically engages in the locking hole (321), the strut (4) is locked in the unfolded position.

7. The double-supported, reverse-folding lightbox according to claim 6, characterized in that: The outer connector (31) has a socket (311) that matches the inner connector (41). The inner connector (41) is slidably installed in the socket (311) along the length of the support rod (4). A sliding groove (312) is provided on one or both sides of the socket (311) along the sliding direction of the support rod (4). A sliding post (411) that matches the sliding groove (312) protrudes from the outer wall of the inner connector (41). The sliding post (411) is slidably and rotatably installed in the sliding groove (312). The outer connector (31) has a notch (313) at the end away from the support (3). The notch (313) is located on one side of the outer connector (31) and is used to accommodate the inner connector (41) of the support rod (4) in the folded position. The groove (312) extends to the outside of the insertion hole (311) and the outer end of the groove (312) is opposite to the notch (313). The notch (313) on the left support (3a) is located on one side of the support rod (4), and the notch (313) on the right support (3b) is located on the other side of the support rod (4). When the locking protrusion (413) is elastically engaged in the lock hole (321), the slide (411) is located in the insertion hole (311).

8. The double-supported, reverse-folding lightbox according to claim 6, characterized in that: The outer connector (31) is covered with a locking sleeve (32), the locking sleeve (32) is fixedly connected to the outer connector (31), and the locking hole (321) is opened on the locking sleeve (32); The portion of the external connector (31) that is directly opposite the lock hole (321) of the lock sleeve (32) has a travel groove (314) that is connected to the insertion hole (311), and the travel groove (314) extends to the notch (313).

9. The double-supported reverse-folding lightbox according to claim 6, characterized in that: The inner connector (41) is a hollow structure. The inner wall of the inner connector (41) has a window extending outward. One side of the window is fixed to an elastic cantilever (412). The locking protrusion (413) is formed on the outer side of the free end of the cantilever (412).

10. The double-supported, reverse-folding lightbox according to claim 9, characterized in that: Both the horizontal side segment (21) and the vertical side segment (11) are hollow structures; The vertical connector (12) includes a connecting seat and two movable components respectively hinged to both ends of the connecting seat. The movable components at both ends of the connecting seat are respectively inserted into the corresponding two vertical side segments (11). The two ends of the intermediate straight section (22) are respectively inserted into the two adjacent horizontal side sections (21); A base plate (7) is fixed to the lower surface of the horizontal frame (2) located below, and the base plate (7) intersects with the horizontal frame (2).

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