Stable projection curtain

Abstract

The invention discloses a stable projection curtain, and relates to the field of curtains, the stable projection curtain comprises a shell and a curtain main body, the curtain main body is located below the shell, an automatic winding mechanism is connected above the curtain main body, upward winding force is provided for the curtain main body, the curtain main body is stored in the shell, a base is fixed below the curtain main body, and the base is connected with the shell. The base is horizontally arranged, the upper portion of the base is connected with a supporting mechanism, the supporting mechanism is located on the rear side of the curtain body, and the supporting mechanism is distributed in a bilateral symmetry mode relative to the curtain body. According to the stable projection curtain, the two sets of supporting mechanisms are arranged to cooperate with the base to provide lower support for the curtain body, so that the curtain body can be kept in a vertical state and cannot shake, the curtain body can be automatically stored when the supporting mechanisms are stored subsequently, on one hand, the stability of the curtain body storage box when the curtain body storage box is released is kept, and on the other hand, the stability of the curtain body storage box is improved. And on the other hand, the curtain can be kept stable during use and cannot swing due to inertia of the vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of screens, in particular to a stable projection screen. Background Art

[0002] The screen is a retractable image display device. Because it is made of flexible material, it can be retracted after use, making it convenient to store and carry. It can also be installed in a vehicle as a rear entertainment screen and can be folded up when not in use.

[0003] Prior art 1 (application number CN202211684699.9, Chinese patent published on April 11, 2023) A projection screen includes a screen machine box, a first winding roller and a first screen, a second winding roller and a second screen are arranged inside the screen machine box, and the first screen and the second screen are respectively installed with a first counterweight bar and a second counterweight bar at the bottom, and the second winding roller is arranged at an oblique upper side of the first winding roller, and the first winding roller and the second winding roller both rotate inward. Due to the coincidence of the installation positions of the first winding roller and the second winding roller, and both rotate toward the middle, when the first screen and the second screen are released, the release positions of the two are very close, and there will be an overlapping area at the edges of the two. When the first screen and the second screen are lowered, the first screen and the second screen are combined to form a complete large screen; and when the first motor or the second motor operates independently , only one of the first or second screens will be released separately, and the required screen can be selected for release according to the needs of the projection type; Prior art 2 (application number CN201811066291.9, Chinese patent published on December 28, 2018) remote control electric screen reel box, including a shell, and a screen reel tube arranged in the shell for winding the screen, an end box is provided at one end of the shell, a controller for controlling the tubular motor is provided in the end box, a tubular motor located in the shell is fixedly installed on the inner side of the end box, an end seat is provided at the other end of the shell, a tube end bearing is provided on the inner side of the end seat, one end of the screen reel tube is inserted into the tubular motor and fixed to the limiting internal gear ring in the limiter of the tubular motor, and the other end is movably inserted into the tube end bearing, and the screen reel tube is fixed to the output shaft of the motor of the tubular motor. The advantages of this application are: simple structure, easy disassembly and assembly, compact structure, high working stability and reliability.

[0004] When current projection screens are in use, they are displayed in a hanging manner at the bottom. Since the screen has a flexible structure, it is easy to tilt and deform under external forces after being lowered. When the screen is used in a car, it is easy to shake due to inertia, affecting the user experience and the overall stability of the screen. Summary of the Invention

[0005] The purpose of the present invention is to provide a stable projection screen to solve the problem raised in the above-mentioned background art that the current projection screen is displayed in a hanging manner when in use. Since the screen has a flexible structure, it is easily tilted and deformed by external forces after being lowered, which affects the display effect.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a stable projection screen, comprising a shell and a screen body, wherein the screen body is located below the shell, and an automatic winding mechanism is connected above the screen body to provide an upward winding force for the screen body and store it inside the shell, a base is fixed below the screen body, the base is horizontally arranged, and a support mechanism is connected above the base, the support mechanism is located on the rear side of the screen body, the support mechanism is symmetrically distributed about the screen body, and the support mechanism is a horizontally folding structure design, and the upper end of the support mechanism is connected to a synchronous control mechanism, which controls the support height of the support mechanism and controls the lowering of the screen body through the synchronous control mechanism.

[0007] To further optimize this technical solution, the automatic winding mechanism includes a winding shaft and an elastic reset mechanism. The winding shaft is rotatably installed inside the shell, and the winding shaft is connected to the upper end of the curtain body, and the interior of the winding shaft is connected with an elastic reset mechanism to provide a rotational reset force for the winding shaft.

[0008] To further optimize this technical solution, a retaining ring is provided on the outside of the reel, and an electromagnetic lock is provided on the rear side of the retaining ring. A lock tongue is provided inside the electromagnetic lock, and the lock tongue is extended to limit the retaining ring. An unlocking confirmation switch is provided on the rear side of the electromagnetic lock.

[0009] To further optimize the technical solution, buffer blocks are installed on the upper surface of the base and the bottom of the shell to provide anti-collision protection for the base after it is folded.

[0010] To further optimize the present technical solution, the support mechanism includes a first support rod, a second support rod, a first rotating member, a second rotating member, a connecting seat and a connecting head. The first support rod and the second support rod are arranged symmetrically in an upper and lower shape, and the second support rod is arranged below the first support rod, and a first rotating member is provided between the second support rod and the first support rod so that the second support rod and the first support rod can rotate. The lower end of the second support rod is rotatably connected to the connecting seat through the second rotating member, and the connecting seat and the base are fixedly connected. The upper end of the first support rod is provided with a connecting head, and the connecting head and the synchronous control mechanism are connected to each other.

[0011] To further optimize the present technical solution, the synchronous control mechanism includes a control shaft, a first gear, a drive plate, a first tooth plate, a second tooth plate and a drive gear. The control shaft is rotatably installed inside the shell, the control shaft and the connecting head are fixedly connected, and the first gear is fixed to the rear side of the control shaft. A drive plate is provided on the outer side of the first gear, and a horizontal sliding structure is formed between the drive plate and the shell, and first tooth plates are provided on the left and right ends of the drive plate respectively. The first tooth plates are staggered up and down at the left and right ends of the drive plate, and a meshing connection is formed between the first tooth plate and the first gear. A second tooth plate is provided in the middle of the drive plate, and the inner side of the second tooth plate is meshed with the drive gear, and the drive gear is connected to the drive motor.

[0012] To further optimize the technical solution, a through slot is provided in the middle of the driving plate, and a guide block is slidably connected inside the through slot, and the guide block is installed inside the shell.

[0013] To further optimize the technical solution, a trigger block is fixed below the driving plate, and micro switches are provided on both the left and right sides of the trigger block to limit the maximum moving distance of the driving plate.

[0014] To further optimize the technical solution, a cleaning mechanism is provided inside the shell, and the cleaning mechanism is located on the front side of the screen body to clean the surface of the screen body when it is rolled up.

[0015] To further optimize the present technical solution, the cleaning mechanism includes a cleaning roller, a movable seat, a cleaning brush, a through-port, a support block and a telescoping device. The cleaning roller is an adhesive cleaning device, and the outer side of the cleaning roller is rotatably connected to the movable seat, and a cleaning brush is fixed on the inner side of the movable seat to clean impurities on the surface of the cleaning roller. A through-port is provided on the outer side of the cleaning brush, a support block is provided on the outer side of the movable seat, and a telescoping device is connected to the front end of the movable seat to control the movement of the movable seat and the cleaning roller.

[0016] To further optimize the present technical solution, the front end of the telescope is connected to the shell, and the rear end of the telescope is connected to a slider, a docking block is fixed to the rear side of the movable seat, and a vertical sliding structure is formed between the docking block and the slider, connecting blocks are provided at both ends of the movable seat, a sliding groove is provided on the surface of the support block, a front and rear sliding structure is formed between the connecting block and the sliding groove, and a return spring is connected to the inner end of the connecting block, and a control head is fixed to the lower end of the connecting block, and the bottom of the support block is designed as an inclined structure.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The two sets of support mechanisms are arranged in conjunction with the base to provide support for the lower part of the screen body, so that the screen body can remain in a vertical state without shaking. When the support mechanism is subsequently retracted, the screen body can be automatically stored. On the one hand, the stability of the screen body storage box is maintained when it is released, avoiding the screen body from getting stuck when it is unrolled. On the other hand, the screen can also remain stable during use and will not swing due to the inertia of the vehicle.

[0019] (2) The first support rod and the second support rod can be folded and stored by rotating together. The first support rod and the second support rod can remain horizontal after being stored, thereby reducing the requirements for their installation space and making their use more flexible.

[0020] (3) The support mechanism can rotate through the engagement of the first gear and the first tooth plate, and the two groups of support mechanisms can maintain synchronous movement in conjunction with the two groups of first tooth plates set in different directions, so that the subsequent drive plate can control the two groups of support mechanisms to move synchronously and stably when performing unidirectional movement.

[0021] (4) The motor provides power to the driving gear, and a set of motors can achieve stable retraction and extension control of the curtain body. The driving gear can cooperate with the micro switch to position the travel of the driving plate when driving the driving plate to move.

[0022] (5) The cleaning roller can be used to remove dust from the surface of the screen body to avoid damaging the screen body. The impurities on the surface of the cleaning roller can be cleaned with a cleaning brush, and the support block can be disassembled to facilitate subsequent maintenance of the cleaning roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the present invention when viewed from above;

[0025] Figure 3 This is a rear view structural diagram of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the base of the present invention when viewed from above;

[0027] Figure 5 This is a schematic diagram of the top cross-sectional structure of the housing of the present invention;

[0028] Figure 6 It is a schematic diagram of the three-dimensional structure of the support mechanism of the present invention;

[0029] Figure 7 This is a schematic diagram of the rear cross-sectional structure of the housing of the present invention;

[0030] Figure 8 For the present invention Figure 7The enlarged structural diagram at a in the middle;

[0031] Figure 9 This is a schematic diagram of the three-dimensional structure of the driving plate of the present invention;

[0032] Figure 10 This is a schematic diagram of the internal structure of the housing of the present invention;

[0033] Figure 11 It is a schematic diagram of the side cross-section structure of the movable seat of the present invention;

[0034] Figure 12 This is a schematic diagram of the top view of the movable seat of the present invention;

[0035] Figure 13 For the present invention Figure 12 The enlarged structural diagram at a in the middle;

[0036] Figure 14 This is a schematic diagram of the main cross-sectional structure of the connection between the movable seat and the support block of the present invention;

[0037] Figure 15 This is a schematic diagram of the main cross-sectional structure of the reel of the present invention;

[0038] Figure 16 It is a schematic diagram of the structure of the end portion of the reel of the present invention.

[0039] In the figure: 1. Housing; 2. Mounting seat; 3. Screen body; 4. Rewinding shaft; 5. Elastic reset mechanism; 501. Torsion spring; 502. Manual adjustment spring; 6. Base; 7. Buffer block; 8. Support mechanism; 801. First support rod; 802. Second support rod; 803. First rotating member; 804. Second rotating member; 805. Connecting seat; 806. Connecting head; 9. Control shaft; 10. First gear; 11. Drive plate; 1101. Through slot; 1 102. Guide block; 12. First tooth plate; 13. Second tooth plate; 14. Drive gear; 15. Trigger block; 16. Micro switch; 17. Cleaning roller; 18. Movable seat; 19. Cleaning brush; 20. Through port; 21. Support block; 22. Docking block; 23. Slider; 24. Retractor; 25. Connecting block; 26. Slide; 27. Return spring; 28. Control head; 29. Retaining ring; 30. Electromagnetic lock; 31. Lock tongue; 32. Unlock confirmation switch. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] See also Figures 1-16 , Embodiment 1: The present invention provides the following technical solutions: A stable projection screen, comprising a shell 1 and a screen body 3, the screen body 3 is located below the shell 1, and an automatic winding mechanism is connected above the screen body 3 to provide an upward winding force for the screen body 3 and store it inside the shell 1, a base 6 is fixed below the screen body 3, the base 6 is horizontally arranged, and a supporting mechanism 8 is connected above the base 6, the supporting mechanism 8 is located on the rear side of the screen body 3, the supporting mechanism 8 is symmetrically distributed about the screen body 3, and the supporting mechanism 8 is a horizontally folding structure design, and the upper end of the supporting mechanism 8 is connected to a synchronous control mechanism, which controls the support height of the supporting mechanism 8 and controls the lowering of the screen body 3 through the synchronous control mechanism.

[0042] A mounting base 2 is connected to the front side of the shell 1, which can assist in the installation of the shell 1. At the same time, relevant control components can also be arranged in the mounting base 2. When in use, the automatic winding mechanism provides a winding control force for the screen body 3, and the support mechanism 8 provides a supporting force for the base 6, so that it can pull out the screen body 3. Subsequently, the supporting effect of the support mechanism 8 is released by the synchronous control mechanism, and the automatic winding mechanism will wind up the screen body 3. The setting of the support mechanism 8 allows the screen body 3 to maintain a stable vertical state to prevent the screen body 3 from shaking due to inertia.

[0043] Embodiment 2: Based on embodiment 1, an automatic winding mechanism is further disclosed, including a winding shaft 4 and an elastic reset mechanism 5. The winding shaft 4 is rotatably mounted inside the housing 1, and the winding shaft 4 is connected to the upper end of the curtain body 3, and the interior of the winding shaft 4 is connected with an elastic reset mechanism 5 to provide a rotational reset force for the winding shaft 4. A retaining ring 29 is provided on the outside of the winding shaft 4, and an electromagnetic lock 30 is provided on the rear side of the retaining ring 29. A lock tongue 31 is provided inside the electromagnetic lock 30, and the lock tongue 31 extends to limit the retaining ring 29. An unlocking confirmation switch 32 is provided on the rear side of the electromagnetic lock 30. A buffer block 7 is installed on the upper surface of the base 6 and the bottom of the housing 1. To provide anti-collision protection for the base 6 after folding, the support mechanism 8 includes a first support rod 801, a second support rod 802, a first rotating member 803, a second rotating member 804, a connecting seat 805 and a connecting head 806. The first support rod 801 and the second support rod 802 are arranged symmetrically in an upper and lower manner, and the second support rod 802 is arranged below the first support rod 801, and a first rotating member 803 is provided between the second support rod 802 and the first support rod 801, so that the second support rod 802 and the first support rod 801 can rotate. The lower end of the second support rod 802 is connected to the second rotating member 804 and the connecting seat 805 to form a rotating member. The first supporting rod 801 is connected, and the connecting seat 805 is fixedly connected to the base 6. A connecting head 806 is provided at the upper end of the first supporting rod 801. The connecting head 806 and the synchronous control mechanism are connected to each other. The synchronous control mechanism includes a control shaft 9, a first gear 10, a driving plate 11, a first tooth plate 12, a second tooth plate 13 and a driving gear 14. The control shaft 9 is rotatably mounted inside the housing 1. The control shaft 9 and the connecting head 806 are fixedly connected, and a first gear 10 is fixed to the rear side of the control shaft 9. A driving plate 11 is provided on the outside of the first gear 10. A horizontal sliding structure is formed between the driving plate 11 and the housing 1, and a first tooth plate 12 is provided at the left and right ends of the driving plate 11. The first tooth plate 12 is staggered in the upper and lower parts at the left and right ends of the driving plate 11, and the first tooth plate 12 and the first gear 10 are meshed together. A second tooth plate 13 is provided in the middle of the driving plate 11, and a driving gear 14 is meshed on the inner side of the second tooth plate 13. The driving gear 14 is connected to the driving motor. A through slot 1101 is provided in the middle of the driving plate 11, and a guide block 1102 is slidably connected to the inside of the through slot 1101. The guide block 1102 is installed inside the shell 1. A trigger block 15 is fixed under the driving plate 11, and micro switches 16 are provided on the left and right sides of the trigger block 15 to limit the maximum moving distance of the driving plate 11.

[0044] When it is necessary to control the curtain body 3 to be lowered, the driving motor provides power to the driving gear 14, and the driving gear 14 drives the second gear plate 13 to move by meshing with the second gear plate 13, so that the driving plate 11 drives the first gear plate 12 to move, and the first gear plate 12 drives the control shaft 9 to rotate by meshing with the first gear 10, so that it drives the first support rod 801 and the second support rod 802 to move and rotate, pushing the base 6 to move downward, so that the base 6 pulls the curtain body 3 to be lowered, and the micro switch 16 can limit the maximum movement distance of the driving plate 11, automatically disconnect the circuit connection of the driving motor, and avoid damage to the supporting mechanism 8 caused by excessive rotation. When it is necessary to store the curtain body 3 later, the driving gear 14 is controlled to rotate in the opposite direction, so that the supporting mechanism 8 is retracted, the base 6 moves upward, and the elastic reset mechanism 5 will drive the winding shaft 4 to rotate to rewind the curtain body 3.

[0045] The elastic reset mechanism 5 includes a torsion spring 501 and a manual adjustment spring 502. The torsion spring 501 is arranged inside the winding shaft 4. The manual adjustment spring 502 can be tightened with a special wrench. After tightening, the torsion spring 501 can be prevented from self-resetting. Turning the wrench counterclockwise increases the winding force, and turning the wrench clockwise reduces the winding force. When the appropriate spring force is set, the wrench can be removed.

[0046] After the curtain body 3 is lowered, the electromagnetic lock 30 controls the lock tongue 31 to extend to block the retaining ring 29 and prevent the reeling shaft 4 from rotating. At this time, the curtain body 3 can remain stable under the action of the downward pulling force.

[0047] Example 3: On the basis of Example 1, it is further disclosed that a cleaning mechanism is provided inside the shell 1. The cleaning mechanism is located on the front side of the screen body 3 to clean the surface of the screen body 3 when it is rolled up. The cleaning mechanism includes a cleaning roller 17, a movable seat 18, a cleaning brush 19, a through-port 20, a support block 21 and a retractor 24. The cleaning roller 17 is an adhesive cleaning device, and the outer side of the cleaning roller 17 is rotatably connected to the movable seat 18. The inner side of the movable seat 18 is fixed with a cleaning brush 19 to clean impurities on the surface of the cleaning roller 17. The outer side of the cleaning brush 19 is provided with a through-port 20, the outer side of the movable seat 18 is provided with a support block 21, and the movable seat 18 is provided with a support block 21. The front end is connected to a telescope 24 to control the movement of the movable seat 18 and the cleaning roller 17. The front end of the telescope 24 is connected to the shell 1, and the rear end of the telescope 24 is connected to the slider 23. A docking block 22 is fixed to the rear side of the movable seat 18, and a vertical sliding structure is formed between the docking block 22 and the slider 23. Connecting blocks 25 are provided at both ends of the movable seat 18. A slide groove 26 is provided on the surface of the support block 21. A front and rear sliding structure is formed between the connecting block 25 and the slide groove 26, and the inner end of the connecting block 25 is connected to a return spring 27, and a control head 28 is fixed to the lower end of the connecting block 25. The bottom of the support block 21 is designed with an inclined structure.

[0048] The dust on the surface of the screen body 3 can be cleaned by the cleaning roller 17. When the screen body 3 is lowered, the movable seat 18 is controlled to move by the telescopic device 24 to release the contact between the cleaning roller 17 and the screen body 3. When the screen body 3 is retracted, the cleaning roller 17 is controlled to contact with the screen body 3. When the screen body 3 moves, the cleaning roller 17 will be driven to rotate, and the cleaning roller 17 will adhere to the dust to avoid damaging the surface of the screen body 3. At the same time, the cleaning brush 19 removes the dust on the surface of the cleaning roller 17. When the cleaning roller 17 needs to be maintained later, the control head 28 can be toggled to drive the connecting block 25 to move, and the connection between the connecting block 25 and the slide groove 26 can be released. The movable seat 18 can be linked with the cleaning roller 17 and removed together, and the docking block 22 slides out from the outside of the slider 23 to achieve the disassembly of the movable seat 18.

[0049] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0050] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "dispose," "install," and other conjunctions should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0051] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A stable projection screen, comprising a housing (1) and a screen body (3); Its characteristics are: The curtain body (3) is located below the shell (1), and an automatic reeling mechanism is connected above the curtain body (3) to provide an upward reeling force for the curtain body (3) and store it inside the shell (1). A base (6) is fixed below the curtain body (3), the base (6) is arranged horizontally, and a support mechanism (8) is connected above the base (6). The support mechanism (8) is located on the rear side of the curtain body (3), the support mechanism (8) is symmetrically distributed about the curtain body (3), and the support mechanism (8) is a horizontal folding structure design, and the upper end of the support mechanism (8) is connected to a synchronous control mechanism, which controls the support height of the support mechanism (8) and controls the lowering of the curtain body (3) through the synchronous control mechanism.

2. The stable projection screen according to claim 1, characterized in that: The automatic rewinding mechanism comprises a rewinding shaft (4) and an elastic reset mechanism (5); the rewinding shaft (4) is rotatably mounted inside the housing (1), and the rewinding shaft (4) is connected to the upper end of the curtain body (3); and the rewinding shaft (4) is internally connected to the elastic reset mechanism (5) to provide a rotational reset force for the rewinding shaft (4).

3. The stable projection screen according to claim 1, characterized in that: A retaining ring (29) is provided on the outside of the reeling shaft (4), and an electromagnetic lock (30) is provided on the rear side of the retaining ring (29). A locking tongue (31) is provided inside the electromagnetic lock (30), and the locking tongue (31) extends to limit the retaining ring (29). An unlocking confirmation switch (32) is provided on the rear side of the electromagnetic lock (30).

4. The stable projection screen according to claim 1, characterized in that: The support mechanism (8) comprises a first support rod (801), a second support rod (802), a first rotating member (803), a second rotating member (804), a connecting seat (805) and a connecting head (806); the first support rod (801) and the second support rod (802) are arranged in an upper and lower symmetrical shape, and the second support rod (802) is arranged below the first support rod (801); and a first rotating member (803) is arranged between the second support rod (802) and the first support rod (801), so that the second support rod (802) and the first support rod (801) can rotate; the lower end of the second support rod (802) is rotatably connected to the connecting seat (805) through the second rotating member (804), and the connecting seat (805) is fixedly connected to the base (6); the upper end of the first support rod (801) is provided with a connecting head (806), and the connecting head (806) and the synchronous control mechanism are connected to each other.

5. The stable projection screen according to claim 4, characterized in that: The synchronous control mechanism comprises a control shaft (9), a first gear (10), a drive plate (11), a first tooth plate (12), a second tooth plate (13) and a drive gear (14). The control shaft (9) is rotatably mounted inside the housing (1). The control shaft (9) and the connector (806) are fixedly connected. The first gear (10) is fixed to the rear side of the control shaft (9). The drive plate (11) is provided on the outer side of the first gear (10). A horizontal sliding structure is formed between the drive plate (11) and the housing (1). The left and right ends of the drive plate (11) are respectively provided with first tooth plates (12). The first tooth plates (12) are staggered at the left and right ends of the drive plate (11) in an upper and lower manner. The first tooth plate (12) and the first gear (10) are meshed and connected. The middle part of the drive plate (11) is provided with a second tooth plate (13). The inner side of the second tooth plate (13) is meshed with the drive gear (14). The drive gear (14) is connected to the drive motor.

6. The stable projection screen according to claim 5, characterized in that: A through slot (1101) is provided in the middle of the driving plate (11), and a guide block (1102) is slidably connected inside the through slot (1101), and the guide block (1102) is installed inside the housing (1).

7. The stable projection screen according to claim 5, characterized in that: A trigger block (15) is fixed below the driving plate (11), and micro switches (16) are provided on both the left and right sides of the trigger block (15) to limit the maximum moving distance of the driving plate (11).

8. The stable projection screen according to claim 1, characterized in that: A cleaning mechanism is provided inside the housing (1), and the cleaning mechanism is located on the front side of the curtain body (3) to clean the surface of the curtain body (3) when it is rolled up.

9. The stable projection screen according to claim 8, characterized in that: The cleaning mechanism comprises a cleaning roller (17), a movable seat (18), a cleaning brush (19), a through-hole (20), a support block (21) and a retractor (24); the cleaning roller (17) is an adhesive cleaning mechanism, and the outer side of the cleaning roller (17) is rotatably connected to the movable seat (18); the inner side of the movable seat (18) is fixed with a cleaning brush (19) for cleaning impurities on the surface of the cleaning roller (17); the outer side of the cleaning brush (19) is provided with a through-hole (20); the outer side of the movable seat (18) is provided with a support block (21); and the front end of the movable seat (18) is connected with a retractor (24) for controlling the movement of the movable seat (18) and the cleaning roller (17).

10. The stable projection screen according to claim 9, characterized in that: The front end of the telescopic device (24) is connected to the housing (1), and the rear end of the telescopic device (24) is connected to a slider (23). A docking block (22) is fixed to the rear side of the movable seat (18), and a vertical sliding structure is formed between the docking block (22) and the slider (23). Connecting blocks (25) are provided at both left and right ends of the movable seat (18). A sliding groove (26) is provided on the surface of the support block (21). A front-back sliding structure is formed between the connecting block (25) and the sliding groove (26). A return spring (27) is connected to the inner end of the connecting block (25), and a control head (28) is fixed to the lower end of the connecting block (25). The lower side of the support block (21) is designed in an inclined structure.

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