A double-layer automatic retractable curtain

Abstract

The utility model discloses a double -deck automatic telescopic window curtain, and this device aims at solving the prior art easily leading to the inconsistent speed of two -sided window curtain opening and closing, unilateral jam and double -deck misplacement appear, the device includes dustproof mounting bracket, is equipped with window curtain structure in dustproof mounting bracket inside center place, and the lower place of both sides wall center of dustproof mounting bracket is equipped with the mounting structure evenly, and the both sides place of dustproof mounting bracket front end face center and the both sides place of rear end face center are equipped with dust collection structure evenly, the utility model discloses, can realize the stable and non - misplacement opening and closing of double -deck window curtain, avoid unilateral jam and both sides asynchronous problem in the unilateral jam and the unilateral jam of separation type design, window curtain sliding block and window curtain body realize magnetic attraction connection through card frame, magnet and magnetic attraction frame, cooperate the fixed effect of pivot, not only convenient to install and remove, but also can automatically correct the position of window curtain body in the window curtain opening and closing process, avoid the opening and closing misplacement caused by installation deviation, and the transmission and installation of screw rod reverse drive form double -deck adaptation guarantee.

Description

Technical Field

[0001] This utility model belongs to the field of curtain technology, specifically relating to a double-layer automatic retractable curtain. Background Technology

[0002] In modern homes, offices, and commercial spaces, curtains, as core soft furnishing products for regulating light, protecting privacy, and beautifying the environment, have seen their functional requirements upgrade from traditional manual opening and closing to automation and multi-functionality. As people's demands for living comfort, ease of operation, and space cleanliness increase, traditional curtains have gradually exposed many technical pain points. The development of double-layer automatic retractable curtains is based on the need to solve these industry pain points, and at the same time, it has emerged in line with the development trend of smart homes.

[0003] The difference in motor speed of a typical double-layer automatic retractable curtain on the market can easily lead to inconsistent opening and closing speeds on both sides of the curtain, resulting in one-sided jamming and double-layer misalignment, affecting light blocking and aesthetics. Furthermore, most products only support simultaneous opening and closing of both layers and cannot control a single layer individually. If you want to open only the sheer curtain for ventilation, you need to manually remove the fabric curtain or open and close it simultaneously and then adjust it, which is cumbersome and difficult to adapt to diverse scenarios. At the same time, the pulley and cord transmission is prone to uneven opening and closing due to cord wear and pulley jamming after long-term use, and may even cause the track to jam. Therefore, it is of great importance to design a double-layer automatic retractable curtain to solve the above defects. Utility Model Content

[0004] (1) Technical problems to be solved To address the shortcomings of existing technologies, the purpose of this utility model is to provide a double-layer automatic retractable curtain. This device aims to solve the problem that differences in motor speed can easily lead to inconsistent opening and closing speeds of the curtains on both sides, resulting in unilateral jamming and double-layer misalignment, which affects light blocking and aesthetics. Furthermore, most products only support simultaneous opening and closing of both layers and cannot control a single layer individually. If you want to open only the sheer curtain for ventilation, you need to manually disassemble the fabric curtain or open and close it simultaneously and then adjust it, which is cumbersome and difficult to adapt to diverse scenarios. At the same time, the pulley and cord transmission is prone to uneven opening and closing due to cord wear and pulley jamming after long-term use, and may even cause the track to become stuck.

[0005] (2) Technical solution To solve the above-mentioned technical problems, this utility model provides a double-layer automatic retractable curtain. The device includes a dustproof mounting frame, a curtain structure is provided at the center of the dustproof mounting frame, mounting structures are provided at the lower center of both sides of the dustproof mounting frame, and dust suction structures are provided at the center of both the front and rear sides of the dustproof mounting frame. The curtain structure includes a moving component and a mounting component. The moving component includes a sliding track, which is located at the front and rear of the center of the inner wall of the dustproof mounting frame. A connecting block is provided at the center of each of the two sliding tracks. Mounting brackets are provided at the front and rear of the upper end of one side wall of the dustproof mounting frame. A servo motor is provided at the center of each of the two mounting brackets on one side.

[0006] When using the device of this technical solution, the first lead screw and the second lead screw are fixedly connected and designed with reverse threads. When the servo motor drives the lead screw to rotate, the sliders on both sides can synchronously spread to both ends or converge towards the center along the slide groove, driving multiple curtain sliding blocks of the same layer to move continuously along the slide rod, ultimately achieving smooth and misaligned opening and closing of the double-layer curtains. This avoids the problems of single-sided jamming and asynchronous opening and closing on both sides in the separate design. The curtain sliding blocks and the curtain body are magnetically connected through the bracket, magnet and magnetic suction bracket. With the fixing effect of the rotating shaft, not only is installation and disassembly convenient, but the position of the curtain body can also be automatically corrected during the opening and closing of the curtain, avoiding opening and closing misalignment caused by installation deviation. The reverse transmission with the lead screw forms a dual adaptation guarantee for transmission and installation.

[0007] As a further embodiment of this utility model, the output ends of the two servo motors respectively pass through one side wall of the dustproof mounting bracket and one side wall of the two slide grooves to the inside of the two slide grooves, and each end is fixedly connected to a first lead screw. One end of each of the two first lead screws passes through one side wall of the two connecting blocks to the other side wall of the two connecting blocks, and each end is fixedly connected to a second lead screw. The outer walls of the two first lead screws and the two second lead screws are threaded with sliders.

[0008] As a further embodiment of this utility model, the installation component includes a sliding rod, which is located at the lower front and rear of the dustproof mounting bracket. Multiple curtain sliding blocks are arranged horizontally on the outer sides of both sliding rods. A sealing ring is fitted at the center of the curtain sliding blocks on both sides and on the outer side of each curtain sliding block. The lower end face of the four sliders is connected to the upper end face of the curtain sliding blocks on both sides at the center.

[0009] As a further embodiment of this utility model, each of the lower end face centers of multiple curtain sliding blocks is provided with a card holder, each of the lower end face centers of multiple card holders is slidably connected with a magnet, each of the lower end face centers of multiple magnets is provided with a magnetic suction frame, each of the magnetic suction frames is provided with a rotating shaft at the center of its interior, and each of the lower ends of the dustproof mounting bracket is provided with a curtain body at the front and rear sides and at the lower center of the interior of multiple magnetic suction frames.

[0010] As a further embodiment of this utility model, the installation structure includes four hydraulic telescopic rods, which are respectively installed at the front and rear of the lower ends of the two side walls of the dustproof mounting frame. A compression spring is sleeved on the outer side of each of the four hydraulic telescopic rods, and a stop plate is provided at one end of each of the four hydraulic telescopic rods. An anti-slip layer is provided at the center of one side wall of each of the four stop plates.

[0011] As a further embodiment of this utility model, the dust collection structure includes four sliding grooves. The four sliding grooves are respectively located at the upper center of the front end face of the dustproof mounting bracket and at the upper center of the rear end face. Each of the four sliding grooves is slidably connected to a dust collection box at the center of one side. A dust collection pump is provided at the center of the rear inner wall of the two front dust collection boxes and at the center of the front inner wall of the two rear dust collection boxes.

[0012] As a further embodiment of this utility model, the output ends of the two front dust pumps pass through the inner walls of the two front dust collection boxes to the rear end of the dust collection boxes, and their ends are slidably connected to the center of the two front sliding grooves. The output ends of the two rear dust pumps pass through the inner walls of the two rear dust collection boxes to the front end of the two rear dust collection boxes, and their ends are slidably connected to the inside of the two rear sliding grooves.

[0013] (3) Beneficial effects Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The device of this utility model adopts a fixed connection and reverse thread design between the first lead screw and the second lead screw. When the servo motor drives the lead screw to rotate, the sliders on both sides can synchronously spread to both ends or converge towards the center along the slide groove, driving multiple curtain sliding blocks of the same layer to move continuously along the slide rod, ultimately realizing the smooth and misaligned opening and closing of the double-layer curtains, avoiding the problems of single-sided jamming and asynchronous opening and closing of both sides in the separate design. The curtain sliding blocks and the curtain body are magnetically connected through the bracket, magnet and magnetic suction bracket. With the fixing effect of the rotating shaft, it is not only easy to install and disassemble, but also automatically corrects the position of the curtain body during the opening and closing of the curtain, avoiding opening and closing misalignment caused by installation deviation. The reverse transmission with the lead screw forms a dual adaptation guarantee for transmission and installation.

[0014] 2. The device of this utility model is slidably connected to the sliding groove of the dustproof mounting bracket through a dust collection box, and its movement power comes directly from the slider of the curtain structure. When the slider drives the curtain sliding block to open and close, it will synchronously pull the dust collection box to move back and forth along the sliding groove, so that the cleaning range of the dust collection box is perfectly matched with the curtain extension and retraction trajectory. When the curtain is unfolded, the dust collection box moves to both ends with the slider to clean the sliding rod, the curtain sliding block and the surface of the curtain body. Through the synchronous linkage of the dust collection function, the friction dust generated during the curtain extension and retraction can be removed in real time, reducing the damage of dust adhesion to the curtain fabric and extending the service life of the curtain. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a three-dimensional side sectional view of the present invention; Figure 3 This is a three-dimensional orthographic structural diagram of the present invention; Figure 4This is a three-dimensional structural diagram of the curtain structure of this utility model; Figure 5 This is a front view structural diagram of the present utility model; Figure 6 for Figure 3 A magnified structural diagram of point A in the middle.

[0016] The labels in the attached diagram are as follows: 1. Dustproof mounting bracket; 2. Curtain structure; 201. Slide groove; 202. Connecting block; 203. Mounting bracket; 204. Servo motor; 205. First lead screw; 206. Second lead screw; 207. Slider; 208. Slide rod; 209. Curtain sliding block; 210. Sealing ring; 211. Clip; 212. Magnet; 213. Magnetic suction bracket; 214. Rotating shaft; 215. Curtain body; 3. Installation structure; 301. Hydraulic telescopic rod; 302. Compression spring; 303. Support plate; 304. Anti-slip layer; 4. Dust collection structure; 401. Slide groove; 402. Dust collection box; 403. Dust pump. Detailed Implementation

[0017] This specific embodiment is a double-layer automatic retractable curtain, the structural diagram of which is shown below. Figure 1-6 As shown, the device is a double-layer automatic retractable curtain. The device includes a dustproof mounting frame 1, a curtain structure 2 at the center of the interior of the dustproof mounting frame 1, mounting structures 3 at the lower center of both sides of the dustproof mounting frame 1, and dust suction structures 4 at the center of both the front and rear sides of the dustproof mounting frame 1.

[0018] First, in this embodiment, the specific structure of the curtain structure 2 is as follows: The curtain structure 2 includes a moving component and an installation component. The moving component includes a slide 201, which is located at the front and rear of the center of the inner wall of the dustproof mounting frame 1. A connecting block 202 is provided at the center of each of the two slides 201. A mounting bracket 203 is provided at the front and rear of the upper end of one side wall of the dustproof mounting frame 1. A servo motor 204 is provided at the center of each of the two mounting brackets 203. The output ends of the two servo motors 204 pass through the side wall of the dustproof mounting frame 1 and the side wall of the two slides 201 respectively, and are connected to the ends of the two slides 201. One end of each of the two first lead screws 205 passes through the side of the two connecting blocks 202 respectively. The wall extends to the other side wall of the two connecting blocks 202, and the ends of each block are fixedly connected to a second lead screw 206. The outer walls of the two first lead screws 205 and the two second lead screws 206 are threaded with sliders 207. By starting the servo motors 204 in the two mounting brackets 203, the output end of the servo motors 204 drives the first lead screws 205 to rotate. Since the first lead screws 205 and the second lead screws 206 are fixedly connected and their threads are opposite, the rotation of the first lead screw 205 will synchronously drive the second lead screws 206 to rotate. Under the action of the threads, the sliders 207 on the outer sides of the first lead screws 205 and the second lead screws 206 will move along the slide groove 201 away from the servo motors 204. The sliders 207 on both sides move to the left and right ends of the dustproof mounting bracket 1, respectively.

[0019] The mounting components include slide rods 208, which are located at the lower front and rear of the dustproof mounting frame 1. Multiple curtain sliding blocks 209 are arranged horizontally on the outer sides of both slide rods 208. Sealing rings 210 are fitted at the center of each curtain sliding block 209 on both sides and on the outer side of each of the two curtain sliding blocks 209. The lower ends of four sliders 207 are connected to the upper ends of the curtain sliding blocks 209 located at the center on both sides. Each lower end of the multiple curtain sliding blocks 209 has a bracket 211 at its center. Magnets 212 are slidably connected to the center of the lower end of each bracket 211. Magnetic suction brackets 213 are located at the center of the lower end of each magnet 212. A pivot 214 is located at the center of the interior of each magnetic suction bracket 213. Curtain bodies 215 are located at the lower front and rear of both sides of the dustproof mounting frame 1 and at the lower center of the interior of each magnetic suction bracket 213.

[0020] The lower end of the slider 207 is fixedly connected to the curtain sliding blocks 209 on both sides of the center. The slider 207 directly drives these two curtain sliding blocks 209 to move synchronously along the slide bar 208. The remaining curtain sliding blocks 209 follow in sequence under the action of the thrust, forming a continuous horizontal unfolding trajectory. The clip 211, magnet 212, and magnetic suction bracket 213 at the lower end of each curtain sliding block 209 are integrated and connected. The rotating shaft 214 inside the magnetic suction bracket 213 has fixed the upper end of the curtain body 215. When the curtain sliding block 209 moves horizontally along the slide bar 208, it will pull the curtain body 215 to unfold horizontally synchronously through the magnetic suction bracket 213 and the rotating shaft 214, eventually covering the window frame area and completing the curtain closure. By controlling the output end of the servo motor 204 to rotate in the opposite direction, the first silk thread is driven. Rod 205 and second lead screw 206 rotate in opposite directions. Slider 207 moves along slide groove 201 towards the servo motor 204. Both sliders 207 converge towards the center of dustproof mounting frame 1. Slider 207 drives the curtain sliding block 209 connected to it to converge towards the center along slide rod 208. The remaining curtain sliding blocks 209 follow in sequence under the action of tension. Through magnetic suction frame 213 and rotating shaft 214, the curtain body 215 is pulled to retract laterally. Finally, the curtain body 215 is rolled up to the inner side of the lower end of dustproof mounting frame 1, and the curtain is opened. If it is necessary to control the front curtain, such as a gauze curtain, or the back curtain, such as a cloth curtain, the servo motor 204 of the corresponding slide groove 201 can be started separately. The same logic as above can realize the independent opening and closing of a single layer of curtain, meeting the needs of different scenarios such as light blocking and ventilation.

[0021] The mounting structure 3 includes four hydraulic telescopic rods 301, which are respectively installed at the front and rear ends of the lower side walls of the dustproof mounting bracket 1. Each of the four hydraulic telescopic rods 301 has a compression spring 302 fitted on its outer side, and each of the four hydraulic telescopic rods 301 has a stop plate 303 at one end. Each of the four stop plates 303 has an anti-slip layer 304 at the center of one side wall. By attaching the dustproof mounting bracket 1 to the pre-set curtain mounting wall or window frame, it is ensured that the four hydraulic telescopic rods 301 of the mounting structure 3 correspond to the stress points on the wall, preventing slippage during subsequent use. When the frame is offset, the four hydraulic telescopic rods 301 are activated by an external control switch, causing their piston rods to extend outward and push the end plate 303 to gradually fit against the wall. During this process, the compression spring 302 on the outside of the hydraulic telescopic rod 301 will compress synchronously with the movement of the end plate 303. The elastic reaction force of the spring will enhance the tightness of the fit between the end plate 303 and the wall. At the same time, the anti-slip layer 304 on the side wall of the end plate 303 is made of rubber, which can increase the friction and prevent the device from sliding due to vibration or external force during long-term use, ultimately achieving stable fixation of the dustproof mounting frame 1.

[0022] The dust collection structure 4 includes four sliding grooves 401, which are respectively located at the center of the upper part of the front face and the center of the upper part of the rear face of the dustproof mounting bracket 1. Each of the four sliding grooves 401 has a dust collection box 402 slidably connected to its center on one side. Dust collection pumps 403 are located at the center of the rear inner wall of the two front dust collection boxes 402 and the center of the front inner wall of the two rear dust collection boxes 402. The output ends of the two front dust collection pumps 403 pass through the rear inner wall of the two front dust collection boxes 402 and lead to the rear end of the dust collection box 402, with their ends slidably connected to the center of the two front sliding grooves 401. The output ends of the two rear dust collection pumps 403 pass through the front inner wall of the two rear dust collection boxes 402 and lead to the rear end of the two rear dust collection boxes 402. The front end and the rear end are slidably connected to the two sliding grooves 401 at the rear. When the curtain is extended or retracted, the vacuum pumps 403 in the four vacuum boxes 402 are activated. The vacuum pumps 403 generate negative pressure and suck up dust through the opening end of the vacuum box 402 towards the inside of the dustproof mounting frame 1 and the curtain retraction area. The slider 207 drives the vacuum box 402 to move back and forth along the sliding groove 401, covering the front and rear faces of the dustproof mounting frame 1 and the inner curtain retraction area. Dust from the surface of the curtain body 215, the slide rod 208, the sliding groove 201 and other parts is sucked into the vacuum box 402. After vacuuming is completed, the vacuum pumps 403 are turned off, the vacuum box 402 is removed from the sliding groove 401, and the accumulated dust inside is cleaned for the next use.

[0023] When using the device of this technical solution, when curtains need to be installed, the dustproof mounting bracket 1 is attached to the preset curtain installation wall or window frame. This ensures that the four hydraulic telescopic rods 301 of the mounting structure 3 correspond to the force points on the wall, preventing the bracket from shifting during subsequent use. The four hydraulic telescopic rods 301 are activated by an external control switch, causing their piston rods to extend outward and push the end plate 303 to gradually adhere to the wall. During this process, the compression spring 302 on the outside of the hydraulic telescopic rod 301 is compressed synchronously with the movement of the end plate 303. The elastic reaction force of the spring enhances the tightness of the adhesion between the end plate 303 and the wall. At the same time, the anti-slip layer 304 on the side wall of the end plate 303 is made of rubber, which increases the friction and prevents the device from sliding due to vibration or external force during long-term use, ultimately achieving stable fixation of the dustproof mounting bracket 1.

[0024] After the curtains are installed, the servo motors 204 inside the two mounting brackets 203 are activated. The output of the servo motors 204 drives the first lead screw 205 to rotate. Since the first lead screw 205 and the second lead screw 206 are fixedly connected and their threads rotate in opposite directions, the rotation of the first lead screw 205 will synchronously drive the rotation of the second lead screw 206. Under the action of the threads, the sliders 207 on the outer sides of the first lead screw 205 and the second lead screw 206 will move along the slide groove 201 in a direction away from the servo motor 204. The sliders 207 on both sides... Do not move the curtain sliding blocks 209 to the left or right ends of the dustproof mounting bracket 1. The lower end of the slider 207 is fixedly connected to the curtain sliding blocks 209 on both sides of the center. The slider 207 will directly drive the two curtain sliding blocks 209 to move synchronously along the slide rod 208. The remaining curtain sliding blocks 209 will follow in sequence under the action of the thrust, forming a continuous horizontal unfolding trajectory. The clip 211, magnet 212 and magnetic suction bracket 213 at the lower end of each curtain sliding block 209 are integrated and connected. The rotating shaft 214 inside the magnetic suction bracket 213 has fixed the upper end of the curtain body 215.

[0025] When the curtain sliding block 209 moves laterally along the slide rod 208, it pulls the curtain body 215 to unfold laterally synchronously via the magnetic bracket 213 and the rotating shaft 214, eventually covering the window frame area and closing the curtain. By controlling the output end of the servo motor 204 to rotate in the opposite direction, the first lead screw 205 and the second lead screw 206 rotate in the opposite direction, and the slider 207 moves along the slide groove 201 towards the servo motor 204. The two sliders 207 converge towards the center of the dustproof mounting bracket 1, and the sliders 207 drive the curtain sliding block 209 connected to it. 9. The curtain slides 208 converge towards the center, and the remaining curtain slide blocks 209 follow in sequence under the pull. The curtain body 215 is pulled laterally to retract through the magnetic bracket 213 and the pivot 214, and finally the curtain body 215 is rolled up to the inner side of the lower end of the dustproof mounting bracket 1, thus opening the curtain. If it is necessary to control the front curtains such as sheer curtains or the back curtains such as cloth curtains separately, the servo motor 204 of the corresponding slide 201 can be started separately. The independent opening and closing of a single layer of curtain can be achieved through the same logic as above, so as to meet the needs of different scenarios such as light blocking and ventilation.

[0026] When the curtains are extended or retracted, the vacuum pumps 403 in the four vacuum boxes 402 are activated, generating negative pressure. The vacuum pumps 403 draw dust through the openings of the vacuum boxes 402 towards the inside of the dustproof mounting frame 1 and the curtain retraction area. The slider 207 drives the vacuum boxes 402 to move back and forth along the sliding groove 401, covering the front and rear faces of the dustproof mounting frame 1 and the inner curtain retraction area. This draws dust from the surface of the curtain body 215, the slide rod 208, the sliding groove 201, and other parts into the vacuum boxes 402. After vacuuming is complete, the vacuum pumps 403 are turned off, and the vacuum boxes 402 are removed from the sliding groove 401 and the accumulated dust inside is cleaned for the next use.

[0027] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A double-layer automatic retractable curtain, comprising a dustproof mounting bracket (1); characterized in that, The dustproof mounting bracket (1) has a curtain structure (2) at its center, and the dustproof mounting bracket (1) has an installation structure (3) at the lower center of both sides of its side walls. The dustproof mounting bracket (1) has a dust suction structure (4) at the center of both the front and rear sides of its front and rear surfaces. The curtain structure (2) includes a moving component and an installation component. The moving component includes a sliding groove (201). The sliding groove (201) is located at the front and rear of the center of the inner wall of the dustproof mounting bracket (1). A connecting block (202) is provided at the center of the two sliding grooves (201). An installation fixing bracket (203) is provided at the front and rear of the upper end of one side wall of the dustproof mounting bracket (1). A servo motor (204) is provided at the center of the two installation fixing brackets (203) on one side.

2. The double-layer automatic retractable curtain according to claim 1, characterized in that, The output ends of the two servo motors (204) pass through one side wall of the dustproof mounting bracket (1) and one side wall of the two slides (201) to the inside of the two slides (201), and the ends of the two motors are fixedly connected to a first lead screw (205). One end of the two first lead screws (205) passes through one side wall of the two connecting blocks (202) to the other side wall of the two connecting blocks (202), and the ends of the two motors are fixedly connected to a second lead screw (206). The outer walls of the two first lead screws (205) and the two second lead screws (206) are threaded with sliders (207).

3. A double-layer automatic retractable curtain according to claim 2, characterized in that, The installation assembly includes a slide bar (208), which is located at the lower front and rear of the dustproof mounting bracket (1). Multiple curtain sliding blocks (209) are arranged horizontally on the outer sides of the two slide bars (208). A sealing ring (210) is fitted at the center of the curtain sliding blocks (209) on both sides and on the outer side of each curtain sliding block (209). The lower end face of the four sliders (207) is connected to the upper end face of the curtain sliding blocks (209) on both sides of the center.

4. A double-layer automatic retractable curtain according to claim 3, characterized in that, Each of the multiple curtain sliding blocks (209) has a card holder (211) at the center of its lower end face, and each of the multiple card holders (211) has a magnet (212) slidably connected at the center of its lower end face. Each of the multiple magnets (212) has a magnetic suction bracket (213) at the center of its lower end face, and each of the multiple magnetic suction brackets (213) has a rotating shaft (214) at the center of its interior. Each of the dustproof mounting brackets (1) has a curtain body (215) at the front and rear sides of its lower end and at the lower center of the multiple magnetic suction brackets (213).

5. A double-layer automatic retractable curtain according to claim 1, characterized in that, The installation structure (3) includes four hydraulic telescopic rods (301). The four hydraulic telescopic rods (301) are respectively installed at the front and rear of the lower end of the two side walls of the dustproof mounting frame (1). A compression spring (302) is sleeved on the outside of each of the four hydraulic telescopic rods (301). A stop plate (303) is provided at one end of each of the four hydraulic telescopic rods (301). An anti-slip layer (304) is provided at the center of one side wall of each of the four stop plates (303).

6. A double-layer automatic retractable curtain according to claim 1, characterized in that, The dust collection structure (4) includes four sliding grooves (401). The four sliding grooves (401) are respectively located at the center of the front end of the dustproof mounting bracket (1) near both sides and at the center of the rear end of the mounting bracket (1) near both sides. A dust collection box (402) is slidably connected to the center of the interior of each of the four sliding grooves (401) near one side. A dust collection pump (403) is provided at the center of the rear inner wall of the two dust collection boxes (402) at the front and at the center of the front inner wall of the two dust collection boxes (402) at the rear.

7. A double-layer automatic retractable curtain according to claim 6, characterized in that, The output ends of the two vacuum pumps (403) at the front pass through the inner walls of the two vacuum boxes (402) at the front and lead to the rear end of the vacuum box (402). The ends of the two vacuum pumps (403) at the rear pass through the inner walls of the two vacuum boxes (402) at the rear and lead to the front end of the two vacuum boxes (402). The ends of the two vacuum pumps (403) at the rear pass through the inner walls of the two vacuum boxes (402) at the rear and lead to the front end of the two vacuum boxes (402). The ends of the two vacuum pumps (403) at the rear pass through the inner walls of the two vacuum boxes (402) at the rear and lead to the front end of the two vacuum boxes (402). The ends of the two vacuum pumps (403) at the rear pass through the inner walls of the two vacuum boxes (402) at the rear and lead to the rear ...

Images