Projection screen control system capable of automatically adjusting projection area

Abstract

The invention discloses a projection screen control system capable of automatically adjusting the projection area, and relates to the technical field of projection screen control systems.The projection screen control system comprises a base, a motor is fixedly installed in the base, a two-way lead screw is installed at the output end of the motor, and a connecting block A and a connecting block B are slidably connected into the base; a connecting rod A and a connecting rod B are rotationally connected into the connecting block A and the connecting block B correspondingly, limiting blocks are rotationally connected to the top ends of the connecting rod A and the connecting rod B correspondingly, a top plate is arranged at the top of the base, a curtain is fixedly installed on the bottom face of the top plate, and a gear A is fixedly installed at the end, away from the motor, of the bidirectional lead screw; and a gear B is rotationally connected into the base. According to the invention, through the lifting rolling type design of the curtain, the curtain can be conveniently adjusted according to the on-site scene and the projection area, and the curtain can be conveniently stored.

Description

Technical Field

[0001] The invention relates to the technical field of projection screen control systems, and in particular to a projection screen control system capable of automatically adjusting a projection area. Background Art

[0002] A projection screen is a special device used for projection display. It can provide a flat, suitable reflective (or transmissive) surface for the projected image, allowing users to obtain a clear, high-quality visual experience.

[0003] For example, the “projection screen” with publication number CN115963686A includes a supporting frame, a rigid frame and a flexible curtain. The flexible curtain is fixedly connected to the supporting frame, and the end of the supporting frame is detachably connected to the end of the rigid frame. After the connection between the end of the supporting frame and the end of the rigid frame is cancelled and the supporting frame is deformed in a direction perpendicular to the flexible curtain, the flexible curtain can be rolled up in a direction perpendicular to the length of the supporting frame, so that the overall size of the rolled projection screen is smaller, thereby simplifying the transportation of the projection screen. After the end of the supporting frame is connected to the end of the rigid frame, the supporting frame is not easily deformed and can effectively support the flexible curtain.

[0004] In the prior art, although this type of projection screen simplifies the difficulty of transporting the projection screen, the supporting frame is not easily deformed, and it can effectively support the flexible screen, but it is lacking in controlling the adjustment of the projection screen. Since this type of projection screen uses a variety of fixed structures to install the screen, it will require the use of disassembly and assembly tools to assemble it when it is needed to open the screen, and it will need to be disassembled again with the help of disassembly and assembly tools when the screen is stored. This type of screen not only cannot adjust the size of the screen according to the actual use scenario, but also increases the difficulty of disassembly and storage, making it inconvenient to transport it, reducing the adaptability and practicality of the projection screen.

[0005] Therefore, we propose a projection screen control system that automatically adjusts the projection area in order to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide a projection screen control system for automatically adjusting the projection area, so as to solve the problem that the projection screen proposed in the above background technology does not have the function of adjusting the size of the screen and storing the screen, thereby reducing the adaptability and practicality of the screen.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A projection screen control system for automatically adjusting the projection area, comprising: a base, a motor is fixedly installed inside the base, a bidirectional lead screw is installed at the output end of the motor, a connecting block A and a connecting block B are slidably connected inside the base, a connecting rod A and a connecting rod B are rotatably connected inside the connecting block A and the connecting block B, respectively, the tops of the connecting rod A and the connecting rod B are rotatably connected to a limiting block, a top plate is provided on the top of the base, a curtain is fixedly installed on the bottom surface of the top plate, a gear A is fixedly installed on one end of the bidirectional lead screw away from the motor, a gear B is rotatably connected inside the base, a tooth chain is provided on the surfaces of the gear A and the gear B, a winding roller is fixedly installed on the surface of the gear B, a winding box is fixedly installed inside the base, and the winding box is rotatably connected to the limiting rod.

[0008] Preferably, the gear A and the gear B are meshed with the toothed chain, the gear A is rotationally connected to the base, and handles are fixedly installed on both sides of the base.

[0009] Preferably, the bidirectional screw is rotationally connected to the base, and the bidirectional screw is connected to the connecting block A and the connecting block B via threads.

[0010] Preferably, the connecting rod A and the connecting rod B are rotationally connected, the limit block and the limit groove are slidingly connected, the winding roller and the base are rotationally connected, and a top plate and a winding roller are respectively installed at both ends of the curtain, and the top plate and the base are slidingly connected.

[0011] Preferably, a protective rod is inserted into the inside of the top plate, a fixing plate is fixedly installed on the top end of the protective rod, a fixing block is fixedly installed on the bottom end of the protective rod, a fixing groove is provided on the top surface of the base, a sliding rod A is slidably connected to the inside of the base, a spring A is sleeved on the surface of the sliding rod A, a shift block A is fixedly installed on one end of the sliding rod A, an insertion rod is fixedly installed on the surface of the shift block A, slots are provided on both sides of the base, and an insertion strip is inserted into the inside of the fixing plate.

[0012] Preferably, the protection rod is slidably connected to the curtain, the material of the surface of the protection rod that contacts the curtain is natural rubber, and the fixing block is slidably connected to the fixing groove.

[0013] Preferably, one end of the spring A is connected to the surface of the shift block A, and the other end is connected to the inner surface of the base, the shift block is slidably connected to the base, the insertion rod is slidably connected to the fixed block, the insertion strip is threadedly connected to the base, and the protective rod is slidably connected to the slot.

[0014] Preferably, storage grooves are provided on both sides of the base, the base is rotatably connected to a rotating rod inside, a torsion spring is sleeved on the surface of the rotating rod, a supporting foot is fixedly installed on the bottom end of the rotating rod, the base is slidably connected to a sliding rod B inside, a spring B is sleeved on the surface of the sliding rod B, a limiting plate is fixedly installed on one end of the sliding rod B, and a shift block B is fixedly installed on the surface of the limiting plate.

[0015] Preferably, one end of the torsion spring is connected to the surface of the supporting foot, and the other end is connected to the inner surface of the base, and the supporting foot is slidably connected to the receiving groove.

[0016] Preferably, one end of the spring B is connected to the surface of the limit plate, and the other end is connected to the inner surface of the base, the limit plate and the base are slidably connected, and the shift block B and the base are slidably connected.

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

[0018] 1. When in use, the motor drives the bidirectional screw to rotate. When the bidirectional screw rotates, it drives the connecting block A and the connecting block B to slide inside the base, so that the connecting block A and the connecting block B move towards each other. When the connecting block A and the connecting block B move, they will drive the connecting rod A and the connecting rod B to rotate, and the connecting rod A and the connecting rod B will also rotate with each other, thereby driving the limit block to slide inside the limit groove. At this time, the connecting rod A and the connecting rod B will lift the top plate from the base, and the top plate will also lift with the curtain. At this time, the bidirectional screw will also drive the gear A to rotate when it rotates, and the gear A When rotating, the gear chain will drive gear B to rotate, thereby driving the winding roller to rotate. When the winding roller rotates, the curtain wrapped around the surface of the winding roller will be released. When the curtain is raised, it will also drive the limit rod to rotate inside the winding box, thereby realizing the lifting of the curtain. When the curtain needs to be rolled up, the top plate can be lowered by simply driving the bidirectional lead screw to reverse through the motor. At the same time, the curtain will be rolled up in the winding box by the winding roller. The lifting and rolling design of the curtain not only makes it easy to adjust according to the actual scene and the size of the projection area, but also makes it easy to store.

[0019] 2. When in use, by rotating the inserting strip, after the inserting strip is rotated out of the base, the inserting strip can be pulled out of the fixing plate. After the inserting strip is pulled out, the protective rod can be pulled out of the slot through the fixing plate, and then the protective rod is inserted into the top plate, so that the protective rod is inserted at the edge of the curtain. At this time, the shifting block A is shifted, and the shifting block A will drive the inserting rod to slide inside the base. After the fixing block is inserted into the fixing groove, the shifting block A is released. At this time, the shifting block A will be driven by the elastic force of the spring A to insert the inserting rod into the fixing block, so that the fixing block is fixed in the fixing groove. At this time, the protective plate will fit tightly to the side of the curtain, thereby preventing the edge of the curtain from being scratched by objects or pedestrians and causing the connection between the curtain and the top plate to be torn. At the same time, it also prevents the edge of the curtain from floating due to the wind when the user is watching the curtain, which affects the viewing experience.

[0020] 3. When in use, by shifting the shift block B, the shift block B will drive the limit plate to slide inside the base. After the limit plate moves away from the supporting foot, the supporting foot will be rotated inside the base due to the torsion force of the torsion spring. After the supporting foot is rotated out of the storage slot, the shift block B is released, and the shift block B and the limit plate will move downward due to the elastic force of the spring B. After the limit plate is attached to the side of the supporting foot, the support foot can be deployed and fixed. When the supporting foot needs to be folded up, it only needs to be rotated to the storage slot, and the support foot can be stored by limiting the position of the supporting foot through the limit plate. The design of the supporting foot has the effect of supporting the base and the curtain from behind, avoiding the curtain and the base from tipping over due to collision when the curtain is unfolded, and also has the effect of facilitating the storage of the supporting foot. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the unfolding structure of a screen in a projection screen control system for automatically adjusting the projection area of ​​the present invention;

[0022] Figure 2 It is a cross-sectional view of a base in a projection screen control system for automatically adjusting the projection area of ​​the present invention;

[0023] Figure 3 The invention provides a projection screen control system for automatically adjusting the projection area. Figure 2 The enlarged view of point A in the middle;

[0024] Figure 4 It is a side sectional view of a base in a projection screen control system for automatically adjusting the projection area of ​​the present invention;

[0025] Figure 5 It is a schematic diagram of the exploded structure of the screen, the winding box and the winding roller in a projection screen control system for automatically adjusting the projection area of ​​the present invention;

[0026] Figure 6The invention provides a projection screen control system for automatically adjusting the projection area. Figure 5 The enlarged view of point B in the middle;

[0027] Figure 7 It is a schematic diagram of the explosion structure at the protection rod in a projection screen control system for automatically adjusting the projection area of ​​the present invention;

[0028] Figure 8 The invention provides a projection screen control system for automatically adjusting the projection area. Figure 7 Enlarged view of point C in the middle;

[0029] Fig. 9 It is a schematic diagram of the explosion structure at the support feet and the protection rod in a projection screen control system for automatically adjusting the projection area of ​​the present invention;

[0030] Fig.10 The invention provides a projection screen control system for automatically adjusting the projection area. Fig. 9 The enlarged view of point D in the middle;

[0031] Fig.11 The invention provides a projection screen control system for automatically adjusting the projection area. Fig. 9 Enlarged view of point E in the middle.

[0032] In the figure: 100, base; 101, motor; 102, bidirectional screw; 103, connecting block A; 104, connecting block B; 105, connecting rod A; 106, connecting rod B; 107, limit block; 108, top plate; 109, limit groove; 110, gear A; 111, gear B; 112, tooth chain; 113, curtain; 114, winding box; 115, winding roller; 116, limit rod; 117 , handle; 200, protective rod; 201, fixed plate; 202, fixed block; 203, fixed slot; 204, slide bar A; 205, spring A; 206, shift block A; 207, insertion rod; 208, slot; 209, insertion strip; 300, storage slot; 301, rotating rod; 302, torsion spring; 303, supporting foot; 304, slide bar B; 305, spring B; 306, limit plate; 307, shift block B. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described 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 creative work are within the scope of protection of the present invention.

[0034] Example 1: Reference Figure 1-6As shown: A projection screen control system for automatically adjusting the projection area comprises: a base 100, a motor 101 is fixedly installed inside the base 100, a bidirectional lead screw 102 is installed at the output end of the motor 101, a connecting block A103 and a connecting block B104 are slidably connected inside the base 100, a connecting rod A105 and a connecting rod B106 are rotatably connected inside the connecting block A103 and the connecting block B104, the top ends of the connecting rod A105 and the connecting rod B106 are rotatably connected to the limiting block 107, a top plate 108 is arranged on the top of the base 100, a screen 113 is fixedly installed on the bottom surface of the top plate 108, a gear A110 is fixedly installed on one end of the bidirectional lead screw 102 away from the motor 101, a gear B111 is rotatably connected inside the base 100, a toothed chain 112 is sleeved on the surface of the gear A110 and the gear B111, A winding roller 115 is fixedly installed on the surface of wheel B111, a winding box 114 is fixedly installed inside the base 100, and the winding box 114 is rotatably connected to a limit rod 116 inside. The gear A110 and the gear B111 are meshed with the tooth chain 112, the gear A110 is rotatably connected to the base 100, and handles 117 are fixedly installed on both sides of the base 100. The bidirectional lead screw 102 is rotatably connected to the base 100, the bidirectional lead screw 102 is threadedly connected to the connecting block A103 and the connecting block B104, the connecting rod A105 is rotatably connected to the connecting rod B106, the limit block 107 is slidably connected to the limit groove 109, the winding roller 115 is rotatably connected to the base 100, and the top plate 108 and the winding roller 115 are respectively installed at both ends of the curtain 113, and the top plate 108 is slidably connected to the base 100.

[0035] In this embodiment, the bidirectional screw rod 102 is driven to rotate by the motor 101. When the bidirectional screw rod 102 rotates, it drives the connecting block A103 and the connecting block B104 to slide inside the base 100, so that the connecting block A103 and the connecting block B104 move toward each other. When the connecting block A103 and the connecting block B104 move, they drive the connecting rod A105 and the connecting rod B106 to rotate, and the connecting rod A105 and the connecting rod B106 also rotate relative to each other, thereby driving the limit block 107 to slide inside the limit groove 109. At this time, the connecting rod A105 and the connecting rod B106 will lift the top plate 108 from the base 100, and the top plate 108 will also lift the curtain 113;

[0036] The two-way screw rod 102 drives the gear A110 to rotate when it rotates, and the gear A110 drives the gear B111 to rotate through the toothed chain 112 when it rotates, thereby driving the winding roller 115 to rotate. When the winding roller 115 rotates, the curtain 113 wound on the surface of the winding roller 115 is released, and the curtain 113 also drives the limit rod 116 to rotate inside the winding box 114 during the lifting process, thereby realizing the lifting of the curtain 113;

[0037] The top plate 108 can be dropped by driving the bidirectional lead screw 102 to reverse by the motor 101, and the curtain 113 will be rolled up in the winding box 114 by the winding roller 115. The lifting and winding design of the curtain 113 not only facilitates adjustment according to the actual scene and the size of the projection area, but also facilitates storage.

[0038] Embodiment 2: Figure 7-10 As shown, a protective rod 200 is inserted into the top plate 108, a fixing plate 201 is fixedly installed on the top of the protective rod 200, a fixing block 202 is fixedly installed on the bottom of the protective rod 200, a fixing groove 203 is provided on the top surface of the base 100, a sliding rod A204 is slidably connected to the inside of the base 100, a spring A205 is sleeved on the surface of the sliding rod A204, a shifting block A206 is fixedly installed on one end of the sliding rod A204, an insertion rod 207 is fixedly installed on the surface of the shifting block A206, slots 208 are provided on both sides of the base 100, and the fixing plate 201 is fixedly installed on the bottom of the protective rod 200. An insertion strip 209 is inserted inside, the protective rod 200 is slidably connected to the curtain 113, the material of the side of the protective rod 200 that fits the curtain 113 is natural rubber, the fixed block 202 is slidably connected to the fixed groove 203, one end of the spring A205 is connected to the surface of the shift block A206, and the other end is connected to the inner surface of the base 100, the shift block and the base 100 are slidably connected, the insertion rod 207 is slidably connected to the fixed block 202, the insertion strip 209 is threadedly connected to the base 100, and the protective rod 200 is slidably connected to the slot 208.

[0039] In this embodiment, by rotating the inserting strip 209, after the inserting strip 209 is rotated out of the base 100, the inserting strip 209 can be pulled out from the fixing plate 201. After the inserting strip 209 is pulled out, the protective rod 200 can be pulled out from the slot 208 through the fixing plate 201, and then the protective rod 200 is inserted into the top plate 108, so that the protective rod 200 is inserted at the edge of the curtain 113. At this time, the shifting block A206 is shifted, and the shifting block A206 will drive the inserting rod 207 to slide inside the base 100. After the fixing block 202 is inserted into the fixing groove 203, the shifting block is released. A206, at this time, the shift block A206 will be acted upon by the elastic force of the spring A205 to drive the insertion rod 207 to be inserted into the fixing block 202, so that the fixing block 202 is fixed in the fixing groove 203, and the protective plate will fit tightly against the side of the curtain 113, thereby preventing the edge of the curtain 113 from being scratched by objects or pedestrians and causing the connection between the curtain 113 and the top plate 108 to be torn, and also preventing the edge of the curtain 113 from floating due to the wind when the user is watching the curtain 113, thereby affecting the viewing experience.

[0040] Embodiment 3: According to Fig. 9 and Fig.11 As shown, storage grooves 300 are provided on both sides of the base 100, and a rotating rod 301 is rotatably connected inside the base 100, and a torsion spring 302 is sleeved on the surface of the rotating rod 301, and a supporting foot 303 is fixedly installed on the bottom end of the rotating rod 301, and a sliding rod B304 is slidably connected inside the base 100, and a spring B305 is sleeved on the surface of the sliding rod B304, and a limiting plate 306 is fixedly installed on one end of the sliding rod B304, and a shift block B307 is fixedly installed on the surface of the limiting plate 306, one end of the torsion spring 302 is connected to the surface of the supporting foot 303, and the other end is connected to the inner surface of the base 100, the supporting foot 303 and the storage groove 300 are slidably connected, one end of the spring B305 is connected to the surface of the limiting plate 306, and the other end is connected to the inner surface of the base 100, the limiting plate 306 and the base 100 are slidably connected, and the shift block B307 and the base 100 are slidably connected.

[0041] In this embodiment, by moving the shift block B307, the shift block B307 will drive the limit plate 306 to slide inside the base 100. After the limit plate 306 is away from the support foot 303, the support foot 303 will be rotated inside the base 100 due to the torsion force of the torsion spring 302. After the support foot 303 is rotated out of the storage slot 300, the shift block B307 is released, and the shift block B307 and the limit plate 306 will move downward due to the elastic force of the spring B305. After the limit plate 306 is attached to the side of the support foot 303, The support legs 303 can be unfolded and fixed. When the support legs 303 need to be folded, the support legs 303 only need to be rotated into the storage slots 300, and the support legs 303 can be stored by limiting the position of the support legs 303 by the limiting plates 306. The design of the support legs 303 has the effect of providing rear support for the base 100 and the curtain 113, thereby preventing the curtain 113 and the base 100 from tipping over due to collision when the curtain 113 is unfolded, and also facilitates the storage of the support legs 303.

[0042] The use method and working principle of the device: when the curtain 113 needs to be unfolded, the motor 101 is used to drive the bidirectional screw rod 102 to rotate. When the bidirectional screw rod 102 rotates, it drives the connecting block A103 and the connecting block B104 to slide inside the base 100, so that the connecting block A103 and the connecting block B104 move toward each other, and when the connecting block A103 and the connecting block B104 move, they drive the connecting rod A105 and the connecting rod B106 to rotate, and the connecting rod A105 and the connecting rod B106 also rotate relative to each other, thereby driving the limit block 107 to slide inside the limit groove 109 At this time, the connecting rod A105 and the connecting rod B106 will lift the top plate 108 from the base 100, and the top plate 108 will also lift up with the curtain 113. At this time, the bidirectional screw rod 102 will drive the gear A110 to rotate when it rotates, and the gear A110 will drive the gear B111 to rotate through the toothed chain 112 when it rotates, thereby driving the winding roller 115 to rotate, and the winding roller 115 will release the curtain 113 wound on the surface of the winding roller 115 when it rotates, and the curtain 113 will also drive the limit rod 116 to rotate inside the winding box 114 during the lifting process, thereby realizing the lifting of the curtain 113;

[0043] When the curtain 113 needs to be rolled up, the motor 101 only needs to drive the bidirectional screw rod 102 to reverse, so that the top plate 108 can fall down, and the curtain 113 will be rolled up in the winding box 114 by the winding roller 115. The lifting and rolling design of the curtain 113 not only facilitates adjustment according to the actual scene and the size of the projection area, but also facilitates storage.

[0044] When the side of the curtain 113 needs to be protected, the inserting strip 209 only needs to be rotated. After the inserting strip 209 is rotated out of the base 100, the inserting strip 209 can be pulled out from the fixing plate 201. After the inserting strip 209 is pulled out, the protection rod 200 can be pulled out from the slot 208 through the fixing plate 201, and then the protection rod 200 is inserted into the top plate 108, so that the protection rod 200 is inserted at the edge of the curtain 113. At this time, the shifting block A206 is shifted, and the shifting block A206 drives the insertion rod 207 to slide inside the base 100. After the fixing block 202 is inserted into the fixing groove 203, , and then release the shift block A206. At this time, the shift block A206 is acted upon by the elastic force of the spring A205 to drive the insertion rod 207 to be inserted into the fixing block 202, so that the fixing block 202 is fixed in the fixing groove 203. At this time, the protective plate will be tightly attached to the side of the curtain 113, thereby preventing the edge of the curtain 113 from being scratched by objects or pedestrians and causing the connection between the curtain 113 and the top plate 108 to be torn. At the same time, it also prevents the edge of the curtain 113 from floating due to the wind when the user is watching the curtain 113, thereby affecting the viewing experience;

[0045] When the support foot 303 needs to be unfolded, the shift block B307 only needs to be shifted, and the shift block B307 will drive the limit plate 306 to slide inside the base 100. After the limit plate 306 is away from the support foot 303, the support foot 303 will be rotated inside the base 100 due to the torsion force of the torsion spring 302. After the support foot 303 is rotated out of the storage slot 300, the shift block B307 is released, and the shift block B307 and the limit plate 306 will move downward due to the elastic force of the spring B305. When the limit plate 306 is attached to the support foot 303, The support legs 303 can be unfolded and fixed by simply moving the support legs 303 to the side. When the support legs 303 need to be folded up, the support legs 303 can be rotated into the storage slots 300, and the support legs 303 can be stored by limiting the position of the support legs 303 by the limiting plates 306. The design of the support legs 303 provides rear support for the base 100 and the curtain 113, thereby preventing the curtain 113 and the base 100 from tipping over due to collision when the curtain 113 is unfolded, and also facilitates the storage of the support legs 303.

[0046] 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 protection scope of the present invention.

Claims

1. A projection screen control system for automatically adjusting the projection area, characterized in that: include: A base (100), wherein a motor (101) is fixedly installed inside the base (100), a bidirectional screw rod (102) is installed at the output end of the motor (101), a connecting block A (103) and a connecting block B (104) are slidably connected inside the base (100), a connecting rod A (105) and a connecting rod B (106) are rotatably connected inside the connecting block A (103) and the connecting block B (104), the top ends of the connecting rod A (105) and the connecting rod B (106) are rotatably connected to a limiting block (107), and a top plate (106) is provided on the top of the base (100). 08), a curtain (113) is fixedly mounted on the bottom surface of the top plate (108), a gear A (110) is fixedly mounted on the end of the bidirectional lead screw (102) away from the motor (101), a gear B (111) is rotatably connected inside the base (100), a toothed chain (112) is sleeved on the surface of the gear A (110) and the gear B (111), a winding roller (115) is fixedly mounted on the surface of the gear B (111), a winding box (114) is fixedly mounted inside the base (100), and a limit rod (116) is rotatably connected inside the winding box (114).

2. The projection screen control system for automatically adjusting the projection area according to claim 1, characterized in that: The gear A (110) and the gear B (111) are both meshed with the toothed chain (112); the gear A (110) is rotationally connected to the base (100); and handles (117) are fixedly mounted on both sides of the base (100).

3. The projection screen control system for automatically adjusting the projection area according to claim 1, characterized in that: The bidirectional screw rod (102) is rotatably connected to the base (100), and the bidirectional screw rod (102) is connected to the connection block A (103) and the connection block B (104) via threads.

4. The projection screen control system for automatically adjusting the projection area according to claim 1, characterized in that: The connecting rod A (105) and the connecting rod B (106) are rotationally connected, the limit block (107) and the limit groove (109) are slidably connected, the winding roller (115) and the base (100) are rotationally connected, and a top plate (108) and a winding roller (115) are respectively installed at both ends of the curtain (113), and the top plate (108) and the base (100) are slidably connected.

5. The projection screen control system for automatically adjusting the projection area according to claim 1, characterized in that: A protective rod (200) is inserted into the top plate (108), a fixing plate (201) is fixedly installed on the top of the protective rod (200), a fixing block (202) is fixedly installed on the bottom of the protective rod (200), a fixing groove (203) is provided on the top surface of the base (100), a sliding rod A (204) is slidably connected to the inside of the base (100), a spring A (205) is sleeved on the surface of the sliding rod A (204), a shifting block A (206) is fixedly installed on one end of the sliding rod A (204), an inserting rod (207) is fixedly installed on the surface of the shifting block A (206), slots (208) are provided on both sides of the base (100), and an inserting strip (209) is inserted into the inside of the fixing plate (201).

6. The projection screen control system for automatically adjusting the projection area according to claim 5, characterized in that: The protection rod (200) is slidably connected to the curtain (113); the material of the surface of the protection rod (200) that is in contact with the curtain (113) is natural rubber; and the fixing block (202) is slidably connected to the fixing groove (203).

7. The projection screen control system for automatically adjusting the projection area according to claim 5, characterized in that: One end of the spring A (205) is connected to the surface of the shift block A (206), and the other end is connected to the inner surface of the base (100); the shift block is slidably connected to the base (100); the insertion rod (207) is slidably connected to the fixed block (202); the insertion strip (209) is threadedly connected to the base (100); and the protection rod (200) is slidably connected to the slot (208).

8. The projection screen control system for automatically adjusting the projection area according to claim 1, characterized in that: The base (100) is provided with storage grooves (300) on both sides, the base (100) is rotatably connected to a rotating rod (301) inside, the surface of the rotating rod (301) is sleeved with a torsion spring (302), the bottom end of the rotating rod (301) is fixedly installed with a supporting foot (303), the base (100) is slidably connected to a sliding rod B (304) inside, the surface of the sliding rod B (304) is sleeved with a spring B (305), one end of the sliding rod B (304) is fixedly installed with a limiting plate (306), and the surface of the limiting plate (306) is fixedly installed with a shifting block B (307).

9. The projection screen control system for automatically adjusting the projection area according to claim 8, characterized in that: One end of the torsion spring (302) is connected to the surface of the support foot (303), and the other end is connected to the inner surface of the base (100), and the support foot (303) is slidably connected to the storage groove (300).

10. The projection screen control system for automatically adjusting the projection area according to claim 8, characterized in that: One end of the spring B (305) is connected to the surface of the limit plate (306), and the other end is connected to the inner surface of the base (100); the limit plate (306) and the base (100) are slidably connected, and the shift block B (307) and the base (100) are slidably connected.

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