A type of rear projection lightbox advertising cloth

Abstract

This invention provides a rear-projection lightbox advertising cloth, belonging to the technical field of advertising equipment. It includes a backlight panel, with a slot fixedly connected to one inner surface of the backlight panel. An internal light source is fixedly connected to one outer surface of the slot. A protective cover is provided outside the internal light source, and a placement cavity is movably connected to one inner surface of the protective cover. During installation, the back-projection lightbox advertising cloth is secured in a first movable slot. The first telescopic ends at both ends of the slot, in conjunction with connecting blocks, push a limiting block into the limiting slot, causing the protective cover to engage with the placement cavity. When internal maintenance is required, the first pressing ends at both ends are driven, pushing the second telescopic ends inward. This inward movement of the second telescopic ends moves the empty tube and buffer tube, causing the push block to push the limiting block inward. This structure allows for faster disassembly during maintenance, ensuring greater convenience.

Description

Technical Field

[0001] This invention relates to the field of advertising equipment technology, specifically to a rear-projection lightbox advertising cloth. Background Technology

[0002] Rear projection advertising light boxes are a common type of advertising display equipment. Their characteristic is that they project advertising images onto a fabric light box via rear projection, making the advertising images more visually impactful and effectively attracting people's attention. This type of advertising is typically used in high-traffic areas such as shopping malls, supermarkets, and cinemas to increase product exposure and sales. Compared to traditional light box advertising, rear projection advertising light boxes use LED light sources, which are energy-saving, low-consumption, and environmentally friendly, reducing the operating costs for businesses.

[0003] However, the maintenance of existing rear-projection advertising light boxes is relatively difficult. Due to their complex internal structure, maintenance personnel need to spend a long time troubleshooting and repairing them once a problem occurs. The internal structure of a rear-projection advertising light box contains multiple components, and if one component malfunctions, it may affect the normal use of the entire device. During maintenance, maintenance personnel need to inspect each component. Due to the complexity of the internal structure, maintenance personnel may need to spend a lot of time when maintaining a rear-projection advertising light box. To address the above problems, a rear-projection light box advertising cloth is proposed. Summary of the Invention

[0004] This invention provides a rear projection lightbox advertising cloth, which aims to solve the problem that the maintenance of existing rear projection advertising cloth lightboxes is relatively difficult. Due to their complex internal structure, maintenance personnel need to spend a long time to troubleshoot and repair problems once they occur. The internal structure of the rear projection advertising cloth lightbox contains multiple components, and if one component malfunctions, it may affect the normal use of the entire device.

[0005] The present invention is implemented as follows: It includes a backlight panel, a slot fixedly connected to one inner surface of the backlight panel, an internal light source fixedly connected to one outer surface of the slot, a protective cover outside the internal light source, a placement cavity movably connected to one inner surface of the protective cover, and locking blocks movably connected to the inner surfaces of both sides of the placement cavity. A first movable groove is formed on the outside of the locking blocks, and first telescopic ends are fixedly connected to the upper and lower ends of the locking blocks. A connecting block is movably connected to one side of the first telescopic end, a limiting block is fixedly connected to one side of the connecting block, a limiting groove is movably connected to the outer surface of the limiting block, a push block is movably connected to the inner surface of the other side of the limiting groove, a buffer tube is fixedly connected to one outer surface of the push block, an empty tube is fixedly connected to one outer surface of one end of the buffer tube, a second telescopic end is movably connected to one outer surface of the empty tube, a fixing ring is fixedly connected to one outer surface of one side of the second telescopic end, and a first pressing end is movably connected to one outer surface of the fixing ring.

[0006] Preferably, a movable plate is movably connected to one outer surface of the card block, an adjusting rod is movably connected to one outer surface of the movable plate, a second movable groove is provided on the outside of the adjusting rod, and a second pressing end is fixedly connected to the inner surface of the other side of the second movable groove.

[0007] Preferably, a fixing plate is fixedly connected to the bottom outer surface of the placement cavity, an extension plate is movably connected to one side of the outer surface of the fixing plate, and a connecting rod is fixedly connected to one side of the extension plate.

[0008] Preferably, a drive end is fixedly connected to the top of the protective cover, a heat dissipation mechanism is movably connected to the inner surface of the drive end, a slot is provided at the bottom of the heat dissipation mechanism, filter plates are fixedly connected to both ends of the slot, and a cleaning mechanism is movably connected to the inner surface of the filter plates.

[0009] Preferably, the first movable slot is formed through the upper and lower ends of the backlight panel, and the first movable slot is symmetrically distributed on both sides of the backlight panel. The protective cover and the placement cavity are connected by a snap-fit ​​connection. The placement cavity is fixed to the outer surface of the backlight panel, the locking block is fixed to the inner surface of the protective cover, the first movable slot is formed on the inner surface of the backlight panel, the first telescopic ends are symmetrically distributed on the upper and lower ends of the locking block, the limiting slot is fixed to the inner surface of the first movable slot, the limiting block is snap-fitted to the inner surface of the limiting slot, the first movable slot is formed on one side of the placement cavity, and the outer ends of the locking block are tightly fitted to the interior of the placement cavity.

[0010] Preferably, the limiting block forms a lifting structure along the first movable groove through the cooperation between the connecting block and the first telescopic end; the locking block forms an engaging connection with the first movable groove through the cooperation between the limiting block and the limiting groove; the inner surface of the limiting groove is tightly fitted with the outer surface of the push block; the push block is movably connected inside the limiting groove; the outer surface of the fixing ring is fixedly connected to the inner surface of the first movable groove; the second telescopic end passes through the fixing ring and is fixedly connected to the first pressing end; and the push block forms a telescopic structure with the first pressing end through the cooperation between the buffer tube, the empty tube, and the second telescopic end.

[0011] Preferably, the outer surface of the movable plate is in close contact with the outer surface of the card block, the adjusting rods are symmetrically distributed at the upper and lower ends of the movable plate, the adjusting rods are movably connected to the inside of the second movable groove, the second movable groove passes through the placement cavity and the outside of the backlight plate, and the adjusting rods pass through the second movable groove and are movably connected to the second pressing end.

[0012] Preferably, the fixed plate and the extension plate are slidably connected, the extension plate forms a telescopic structure with the placement cavity through the fixed plate, three connecting rods are provided, the connecting rods are L-shaped, and the inner surface of the connecting rods and the extension plate is tightly fitted with the outer surface of the protective cover.

[0013] Preferably, the drive ends are symmetrically distributed on the top of the protective cover, the drive ends are rotatably connected to the heat dissipation mechanism, the slots are opened at the bottom of the protective cover, the filter plate is arranged in an "I" shape, the cleaning mechanism is rotatably connected to the slots, the cleaning mechanism is symmetrically distributed on the inner surface of the slots, and the cleaning mechanism is placed at the inner end of the filter plate.

[0014] The rear-projection lightbox advertising cloth provided by this invention, when in use, uses a locking block to engage the protective cover inside the placement cavity. The backlight panel, protective cover, and internal light source work together to enable the device to operate normally. The outside of the protective cover is used to place the advertising cloth. During installation, the locking block is secured inside the first movable groove. The first telescopic ends at both ends of the locking block, in conjunction with the connecting block, push the limiting block into the limiting groove, thereby engaging the locking block inside the limiting groove and engaging the protective cover with the placement cavity. When maintenance is required inside the device, the first pressing ends at both ends are driven to push the second telescopic end inward. When the second telescopic end pushes inward, it moves the empty tube and buffer tube, causing the push block to push the limiting block inward. This structure allows for faster disassembly during maintenance, thus ensuring greater convenience during maintenance.

[0015] The rear projection lightbox advertising cloth provided by this invention, when the card block is placed inside the placement cavity, controls the second pressing end to move inward, and the second pressing end drives the adjusting rod and the movable plate to move inward, thereby pushing the card block, so that the card block and the inner wall of the first movable groove fit more closely. The movable plate, together with the card block, makes the protective cover more stable when locked. At the same time, the fixed plate and the extension plate outside the placement cavity cooperate with each other to tightly fit the four corners of the protective cover. Even when the wind is strong or the device shakes, the device can remain stable. The protective cover and the placement cavity are detachably connected. This connection method facilitates the maintenance of the device, but at the same time, it breaks up the internal structure and reduces the stability of the device. The extension plate and the movable plate make the protective cover more stable when locked.

[0016] The rear projection lightbox advertising cloth provided by this invention, when the protective cover and the backlight panel are attached to the outside, due to the protrusion of the placement cavity, there are excess gaps between the protective cover and the backlight panel. Dust in the air will enter the interior of the protective cover through the gaps, thereby affecting the clarity of the advertising cloth projection. At this time, the heat dissipation mechanism is driven to rotate by the drive end. When the heat dissipation mechanism is working, it blows the bottom, blowing the dust and impurities inside towards the slot. The cleaning mechanism inside the filter plate leaks the dust from the bottom when it rotates, thereby completing the cleaning of the protective cover. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The above and other objects, features, and advantages of the present invention will become clearer through the accompanying drawings. The same reference numerals indicate the same parts in all the drawings. The drawings are not intentionally drawn to scale to actual dimensions; the focus is on illustrating the main points of the invention.

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the rear projection lightbox advertising cloth provided by the present invention;

[0019] Figure 2 This is a schematic diagram of the rear-projection lightbox advertising cloth structure viewed from below provided by the present invention;

[0020] Figure 3 This is a schematic diagram of the first movable groove structure of the rear projection lightbox advertising cloth provided by the present invention;

[0021] Figure 4 This is a schematic diagram of the movable panel structure of the rear projection lightbox advertising cloth provided by the present invention;

[0022] Figure 5 The rear projection lightbox advertising cloth provided by this invention Figure 2 Schematic diagram of the structure at point A in the middle;

[0023] Figure 6 The rear projection lightbox advertising cloth provided by this invention Figure 1 Schematic diagram of the structure at point B.

[0024] Summary of reference numerals in the attached drawings: 1. Backlight panel; 101. Slot; 102. Internal light source; 103. Protective cover; 104. Placement cavity; 2. Locking block; 201. First movable slot; 202. First telescopic end; 203. Connecting block; 204. Limiting block; 205. Limiting slot; 206. Push block; 207. Buffer tube; 208. Empty tube; 209. Second telescopic end; 210. Fixing ring; 211. First pressing end; 3. Movable plate; 301. Adjusting rod; 302. Second movable slot; 303. Second pressing end; 4. Fixing plate; 401. Extension plate; 402. Connecting rod; 5. Drive end; 501. Heat dissipation mechanism; 502. Slot; 503. Filter plate; 504. Cleaning mechanism. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0029] Example 1, please refer to Figure 1 and Figure 3 .

[0030] This embodiment provides a rear-projection lightbox advertising cloth, including a backlight panel 1. A slot 101 is fixedly connected to the inner surface of one side of the backlight panel 1. An internal light source 102 is fixedly connected to the outer surface of one side of the slot 101. A protective cover 103 is provided outside the internal light source 102. A placement cavity 104 is movably connected to the inner surface of one side of the protective cover 103. Locking blocks 2 are movably connected to the inner surfaces of both sides of the placement cavity 104. A first movable groove 201 is opened on the outside of the locking blocks 2. A first telescopic end 202 is fixedly connected to the upper and lower ends of the locking blocks 2. A connecting... Block 203 is externally fixedly connected to one side of a limiting block 204. The outer surface of the limiting block 204 is movably connected to a limiting groove 205. The inner surface of the other side of the limiting groove 205 is movably connected to a push block 206. The outer surface of one end of the push block 206 is fixedly connected to a buffer tube 207. The outer surface of one end of the buffer tube 207 is fixedly connected to an empty tube 208. The outer surface of one end of the empty tube 208 is movably connected to a second telescopic end 209. The outer surface of one side of the second telescopic end 209 is fixedly connected to a fixing ring 210. The outer surface of one end of the fixing ring 210 is movably connected to a first pressing end 211.

[0031] The first movable groove 201 is formed through the upper and lower ends of the backlight panel 1. The first movable groove 201 is symmetrically distributed on both sides of the backlight panel 1. The protective cover 103 and the placement cavity 104 are engaged. The placement cavity 104 is fixed to the outer surface of the backlight panel 1. The locking block 2 is fixed to the inner surface of the protective cover 103. The first movable groove 201 is formed on the inner surface of the backlight panel 1. The first telescopic ends 202 are symmetrically distributed at the upper and lower ends of the locking block 2. The limiting groove 205 is fixed to the inner surface of the first movable groove 201. The limiting block 204 is engaged with the inner surface of the limiting groove 205. The first movable groove 201 is formed through the upper and lower ends of the backlight panel 1. The first telescopic ends 202 are symmetrically distributed at the upper and lower ends of the locking block 2. The limiting groove 205 is fixed to the inner surface of the first movable groove 201. The limiting block 204 is engaged with the inner surface of the limiting groove 205. Located on one side of the placement cavity 104, the outer ends of the locking block 2 are tightly fitted to the interior of the placement cavity 104. The limiting block 204 forms a lifting structure along the first movable groove 201 through the cooperation between the connecting block 203 and the first telescopic end 202. The locking block 2 is engaged with the first movable groove 201 through the cooperation between the limiting block 204 and the limiting groove 205. The inner surface of the limiting groove 205 is tightly fitted to the outer surface of the push block 206. The push block 206 is movably connected to the interior of the limiting groove 205. The outer surface of the fixing ring 210 is fixedly connected to the inner surface of the first movable groove 201. The second extension... The retractable end 209 passes through the fixing ring 210 and is fixedly connected to the first pressing end 211. The push block 206 forms a telescopic structure with the first pressing end 211 through the cooperation between the buffer tube 207, the empty tube 208, and the second telescopic end 209. When the device is in use, the protective cover 103 is locked inside the placement cavity 104 by the locking block 2. The backlight plate 1, the protective cover 103, and the internal light source 102 cooperate with each other to enable the device to work normally. The outside of the protective cover 103 is used to place the advertising cloth. When the device is installed, the locking block 2 is locked inside the first movable groove 201. The first telescopic ends 2 at both ends of the locking block 2 02. The connecting block 203 pushes the limiting block 204 into the limiting groove 205, thereby locking the locking block 2 into the limiting groove 205, and locking the protective cover 103 into the placement cavity 104. When maintenance is required inside the equipment, the first pressing end 211 at both ends is driven to push the second telescopic end 209 inward. When the second telescopic end 209 is pushed inward, it drives the empty tube 208 and the buffer tube 207 to move, causing the push block 206 to push the limiting block 204 inward. This structure allows the device to be disassembled more quickly during maintenance, thus ensuring that the device is more convenient to maintain.

[0032] Example 2, please refer to Figure 4 and Figure 5 .

[0033] A movable plate 3 is movably connected to one side of the outer surface of the card block 2. An adjusting rod 301 is movably connected to one side of the outer surface of the movable plate 3. A second movable groove 302 is provided on the outside of the adjusting rod 301. A second pressing end 303 is fixedly connected to the inner surface of the other side of the second movable groove 302. A fixing plate 4 is fixedly connected to the outer surface of the bottom end of the placement cavity 104. An extension plate 401 is movably connected to one side of the outer surface of the fixing plate 4. A connecting rod 402 is fixedly connected to one side of the extension plate 401.

[0034] The outer surface of the movable plate 3 is tightly fitted with the outer surface of the locking block 2. Adjusting rods 301 are symmetrically distributed at the upper and lower ends of the movable plate 3. The adjusting rods 301 are movably connected to the inside of the second movable groove 302. The second movable groove 302 passes through the placement cavity 104 and the outside of the backlight plate 1. The adjusting rods 301 pass through the second movable groove 302 and are movably connected to the second pressing end 303. The fixed plate 4 and the extension plate 401 are slidably connected. The extension plate 401 forms a telescopic structure with the placement cavity 104 through the fixed plate 4. Three connecting rods 402 are provided. The connecting rods 402 are L-shaped. The inner surfaces of the connecting rods 402 and the extension plate 401 are tightly fitted with the outer surface of the protective cover 103. When the locking block 2 is placed inside the placement cavity 104, the second pressing end 303 is controlled. The pressing end 303 moves inward, and the second pressing end 303 drives the adjusting rod 301 and the movable plate 3 to move inward, thereby pushing the locking block 2 so that the locking block 2 and the inner wall of the first movable groove 201 fit more closely. The movable plate 3, together with the locking block 2, makes the protective cover 103 more stable when locked. At the same time, the fixing plate 4 and the extension plate 401 outside the placement cavity 104 cooperate with each other to tightly fit the four corners of the protective cover 103. Even in strong winds or when the device shakes, the device can remain stable. The protective cover 103 and the placement cavity 104 are detachably connected. This connection method facilitates the maintenance of the device, but at the same time, it breaks up the internal structure and reduces the stability of the device. The extension plate 401 and the movable plate 3 make the protective cover 103 more stable when locked.

[0035] Example 3, please refer to Figure 2 and Figure 6 .

[0036] The top of the protective cover 103 is fixedly connected to a drive end 5, the inner surface of the drive end 5 is movably connected to a heat dissipation mechanism 501, the bottom of the heat dissipation mechanism 501 is provided with a slot 502, the two ends of the slot 502 are fixedly connected to a filter plate 503, and the inner surface of the filter plate 503 is movably connected to a cleaning mechanism 504.

[0037] The drive ends 5 are symmetrically distributed on the top of the protective cover 103, and are rotatably connected to the heat dissipation mechanism 501. The slot 502 is opened at the bottom of the protective cover 103. The filter plate 503 is arranged in an "I" shape. The cleaning mechanism 504 is rotatably connected to the slot 502. The cleaning mechanism 504 is symmetrically distributed on the inner surface of the slot 502 and is placed inside the filter plate 503. When the protective cover 103 is attached to the outside of the backlight plate 1, due to the placement cavity 104 The protrusion causes an extra gap between the protective cover 103 and the backlight panel 1. Dust in the air will enter the interior of the protective cover 103 through the gap, thus affecting the clarity of the advertising cloth. At this time, the heat dissipation mechanism 501 is driven to rotate by the drive end 5. When the heat dissipation mechanism 501 is working, it blows the bottom and blows the dust and impurities inside to the slot 502. The cleaning mechanism 504 inside the filter plate 503 leaks the dust from the bottom when it rotates, thus completing the cleaning of the protective cover 103.

[0038] Working principle: When in use, the protective cover 103 is engaged inside the placement cavity 104 by the locking block 2. The backlight panel 1, the protective cover 103, and the internal light source 102 work together to enable the device to work normally. The outside of the protective cover 103 is used to place the advertising cloth. When the device is installed, the locking block 2 is locked inside the first movable groove 201. The first telescopic ends 202 at both ends of the locking block 2, together with the connecting block 203, push the limiting block 204 into the limiting groove 205, thereby engaging the locking block 2 inside the limiting groove 205, and engaging the protective cover 103 with the placement cavity 104. When maintenance is required inside the device, the first pressing ends 211 at both ends are driven to push the second telescopic end 209 inward. When the second telescopic end 209 is pushed inward, it drives the empty tube 208 and the buffer tube 207 to move, causing the push block 206 to push the limiting block 204 inward. This structure allows the device to be disassembled more quickly during maintenance, thus ensuring that the device is maintained more quickly and conveniently.

[0039] When the locking block 2 is placed inside the placement cavity 104, the second pressing end 303 is controlled to move inward. The second pressing end 303 drives the adjusting rod 301 and the movable plate 3 to move inward, thereby pushing the locking block 2 so that the locking block 2 and the inner wall of the first movable groove 201 fit more closely. The movable plate 3, together with the locking block 2, makes the protective cover 103 more stable when locked. At the same time, the fixing plate 4 and the extension plate 401 outside the placement cavity 104 cooperate with each other to tightly fit the four corners of the protective cover 103. Even in the case of strong wind or device shaking, the device can remain stable. The protective cover 103 and the placement cavity 104 are detachably connected. This connection method facilitates the maintenance of the device, but at the same time, it breaks up the internal structure and reduces the stability of the device. The extension plate 401 and the movable plate 3 make the protective cover 103 more stable when locked.

[0040] When the protective cover 103 is attached to the outside of the backlight panel 1, due to the protrusion of the placement cavity 104, there is an extra gap between the protective cover 103 and the backlight panel 1. Dust in the air will enter the interior of the protective cover 103 through the gap, thus affecting the clarity of the advertising cloth. At this time, the heat dissipation mechanism 501 is driven to rotate by the drive end 5. When the heat dissipation mechanism 501 is working, it blows the bottom and blows the dust and impurities inside to the slot 502. The cleaning mechanism 504 inside the filter plate 503 leaks the dust from the bottom when it rotates, thus completing the cleaning of the protective cover 103.

[0041] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rear-projection lightbox advertising cloth, comprising a backlight panel (1), characterized in that: A slot (101) is fixedly connected to the inner surface of one side of the backlight panel (1), and an internal light source (102) is fixedly connected to the outer surface of one side of the slot (101). A protective cover (103) is provided outside the internal light source (102). A placement cavity (104) is movably connected to the inner surface of one side of the protective cover (103). A locking block (2) is movably connected to the inner surfaces of both sides of the placement cavity (104). A first movable groove (201) is opened on the outside of the locking block (2). A first telescopic end (202) is fixedly connected to the upper and lower ends of the locking block (2). A connecting block (203) is movably connected to the outer side of one side of the first telescopic end (202). 03) is externally fixedly connected to a limiting block (204), the outer surface of the limiting block (204) is movably connected to a limiting groove (205), the inner surface of the limiting groove (205) is movably connected to a push block (206), the outer surface of one end of the push block (206) is fixedly connected to a buffer tube (207), the outer surface of one end of the buffer tube (207) is fixedly connected to an empty tube (208), the outer surface of one end of the empty tube (208) is movably connected to a second telescopic end (209), the outer side of one side of the second telescopic end (209) is fixedly connected to a fixing ring (210), and the outer side of one end of the fixing ring (210) is movably connected to a first pressing end (211). The first movable groove (201) is opened through the upper and lower ends of the backlight plate (1). The first movable groove (201) is symmetrically distributed on both sides of the backlight plate (1). The protective cover (103) and the placement cavity (104) are connected by a snap-fit ​​connection. The placement cavity (104) is fixed to the outer surface of the backlight plate (1). The locking block (2) is fixed to the inner surface of the protective cover (103). The first movable groove (201) is opened on the inner surface of the backlight plate (1). The first telescopic end (202) is symmetrically distributed on the upper and lower ends of the locking block (2). The limiting groove (205) is fixed to the inner surface of the first movable groove (201). The limiting block (204) is snap-fitted to the inner surface of the limiting groove (205). The first movable groove (201) is opened on one side of the placement cavity (104). The outer ends of the locking block (2) are tightly fitted to the inside of the placement cavity (104). The limiting block (204) forms a lifting structure along the first movable groove (201) through the cooperation between the connecting block (203) and the first telescopic end (202). The locking block (2) forms a locking connection with the first movable groove (201) through the cooperation between the limiting block (204) and the limiting groove (205). The inner surface of the limiting groove (205) is in close contact with the outer surface of the push block (206). The push block (206) is movably connected to the inside of the limiting groove (205). The outer surface of the fixing ring (210) is fixedly connected to the inner surface of the first movable groove (201). The second telescopic end (209) passes through the fixing ring (210) and is fixedly connected to the first pressing end (211). The push block (206) forms a telescopic structure with the first pressing end (211) through the cooperation between the buffer tube (207), the empty tube (208) and the second telescopic end (209).

2. The rear-projection lightbox advertising cloth according to claim 1, characterized in that: A movable plate (3) is movably connected to one side of the outer surface of the card block (2), and an adjusting rod (301) is movably connected to one side of the outer surface of the movable plate (3). A second movable groove (302) is provided on the outside of the adjusting rod (301), and a second pressing end (303) is fixedly connected to the other side of the inner surface of the second movable groove (302).

3. The rear-projection lightbox advertising cloth according to claim 2, characterized in that: A fixing plate (4) is fixedly connected to the bottom outer surface of the placement cavity (104), and an extension plate (401) is movably connected to one side of the outer surface of the fixing plate (4). A connecting rod (402) is fixedly connected to one side of the extension plate (401).

4. The rear-projection lightbox advertising cloth according to claim 3, characterized in that: The top of the protective cover (103) is fixedly connected to a drive end (5), and the inner surface of the drive end (5) is movably connected to a heat dissipation mechanism (501). The bottom of the heat dissipation mechanism (501) is provided with a slot (502), and the two ends of the slot (502) are fixedly connected to a filter plate (503). The inner surface of the filter plate (503) is movably connected to a cleaning mechanism (504).

5. The rear-projection lightbox advertising cloth according to claim 4, characterized in that: The outer surface of the movable plate (3) is closely fitted with the outer surface of the card block (2). The adjusting rod (301) is symmetrically distributed at the upper and lower ends of the movable plate (3). The adjusting rod (301) is movably connected to the inside of the second movable groove (302). The second movable groove (302) passes through the placement cavity (104) and the outside of the backlight plate (1). The adjusting rod (301) passes through the second movable groove (302) and is movably connected to the second pressing end (303).

6. The rear-projection lightbox advertising cloth according to claim 5, characterized in that: The fixed plate (4) and the extension plate (401) are slidably connected. The extension plate (401) forms a telescopic structure with the placement cavity (104) through the fixed plate (4). There are three connecting rods (402). The connecting rods (402) are L-shaped. The inner surfaces of the connecting rods (402) and the extension plate (401) are tightly fitted with the outer surface of the protective cover (103).

7. A rear-projection lightbox advertising cloth according to claim 6, characterized in that: The drive end (5) is symmetrically distributed on the top of the protective cover (103). The drive end (5) is rotatably connected to the heat dissipation mechanism (501). The slot (502) is opened at the bottom of the protective cover (103). The filter plate (503) is set in the shape of "I". The cleaning mechanism (504) is rotatably connected to the slot (502). The cleaning mechanism (504) is symmetrically distributed on the inner surface of the slot (502). The cleaning mechanism (504) is placed at the inner end of the filter plate (503).

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