Projection curtain device

Abstract

The utility model belongs to the technical field of projection equipment, and particularly provides a projection curtain device which comprises a curtain, a winding mechanism, a telescopic mechanism and a power mechanism, the winding mechanism is connected to one end of the curtain and used for winding and unfolding the curtain, the telescopic mechanism is connected to the curtain, and stretching of the telescopic mechanism and unfolding of the curtain are synchronous. The retraction of the telescopic mechanism is synchronous with the rolling of the curtain, and the power mechanism is connected to the telescopic mechanism and is used for driving the telescopic mechanism to move and locking the telescopic mechanism. The power mechanism drives the telescopic mechanism to stretch and the winding mechanism to rotate to cooperatively send out the curtain, so that the curtain is unfolded, when the curtain is unfolded to any required degree, the power mechanism locks the telescopic mechanism to enable the curtain to stably hover at the current position, and then the winding mechanism can rotate reversely to form resistance with the telescopic mechanism in a locked state, so that the curtain is unfolded. Therefore, the curtain can be tensioned, so that the curtain is flat and is not easy to wrinkle and shake, and the watching experience of a user is improved.

Description

Technical Field

[0001] This application belongs to the field of projection equipment technology, specifically relating to a projection screen device. Background Technology

[0002] Existing projection screen devices typically use a motor to drive a rotating tube to unfold and retract the projection screen. However, unfolded projection screens are prone to wrinkles and shaking, affecting the user's viewing experience. Utility Model Content

[0003] The purpose of this application is to provide a projection screen device that solves the technical problems of existing projection screens easily wrinkling and shaking when unfolded.

[0004] To achieve the above objectives, the technical solution adopted in this application is: a projection screen device, including a screen, a roll-up mechanism, a telescopic mechanism, and a power mechanism. The roll-up mechanism is connected to one end of the screen and is used to roll up and unfold the screen. The telescopic mechanism is connected to the screen, and the extension of the telescopic mechanism is synchronized with the unfolding of the screen, and the retraction of the telescopic mechanism is synchronized with the roll-up of the screen. The power mechanism is connected to the telescopic mechanism and is used to drive the telescopic mechanism to move and lock the telescopic mechanism.

[0005] Furthermore, the power mechanism includes a fixed component and a power component disposed on the fixed component; the telescopic mechanism includes a first rod and a second rod, the two ends of the first rod being rotatably connected to one end of the fixed component and one end of the second rod, respectively, and the other end of the second rod being rotatably connected to the end of the curtain away from the retraction mechanism; the power component is used to drive the first rod to rotate relative to the fixed component and to lock the first rod.

[0006] Furthermore, a rotating shaft is fixedly installed at the end of the first rod away from the second rod, and the rotating shaft is rotatably connected to the fixed assembly. The rotating shaft is provided with helical teeth. The power assembly includes a drive assembly and a rotating rod. The power output end of the drive assembly is connected to the rotating rod and is used to drive the rotating rod to rotate. The rotating rod is provided with helical teeth, and the helical teeth mesh with the helical teeth for transmission.

[0007] Furthermore, the rotating rod is a worm gear, and the rotating shaft includes a shaft body and a worm wheel disposed on the shaft body. The shaft body is rotatably connected to the fixed component, and the worm wheel rotates synchronously with the shaft body. The worm wheel has helical teeth.

[0008] Furthermore, the projection screen device also includes a control system, which is electrically connected to the drive assembly and can control the start and stop of the drive assembly. The control system includes an abnormal current monitoring module, which is used to monitor the current when the drive assembly is working.

[0009] Furthermore, there are two telescopic mechanisms and two power mechanisms. One end of the first rod of each of the two telescopic mechanisms is rotatably connected to the fixed component of each of the two power mechanisms, and the power components of each of the two power mechanisms are respectively engaged with the first rod of each of the two telescopic mechanisms.

[0010] Furthermore, the rewinding mechanism includes a first fixed bracket, a roller, and an elastic element. The roller is rotatably connected to the first fixed bracket and to one end of the screen. The elastic element is connected to the first fixed bracket and the roller. When the power mechanism drives the telescopic mechanism to extend, thereby unfolding the screen, the roller rotates relative to the first fixed bracket in a first clockwise direction, and the elastic element undergoes elastic deformation. When the elastic element returns to its original state, it can drive the roller to rotate in a direction opposite to the first clockwise direction.

[0011] Furthermore, one end of the reel is rotatably connected to the first fixed bracket. The winding mechanism also includes a second fixed bracket and a connector. The connector is rotatably connected to the second fixed bracket and fixedly connected to the end of the reel away from the first fixed bracket. The reel is tubular, and the elastic element is a spring. The spring is disposed inside the reel, and both ends of the spring are fixedly connected to the first fixed bracket and the connector, respectively.

[0012] Furthermore, the winding mechanism includes a reel, a first driver, and a damping sleeve. The reel is connected to one end of the curtain. The first driver includes a housing, a driver body, and a power output shaft. The driver body is disposed inside the housing and is connected to the power output shaft and used to drive the power output shaft to rotate. The power output shaft is fixedly connected to the reel. The damping sleeve is fixedly connected to the housing and sleeved on the power output shaft.

[0013] Furthermore, the winding mechanism includes a roller and a second driver. The roller is connected to one end of the curtain, and the power output end of the second driver is connected to the roller and used to drive the roller to rotate. The second driver includes a brushless iron core motor.

[0014] Compared with existing technologies, the projection screen device provided in this application has the following advantages: During use, the power mechanism drives the telescopic mechanism to extend, and the retraction mechanism rotates to assist in extending the screen, thereby unfolding the screen. When the screen is unfolded to any desired extent, the power mechanism locks the telescopic mechanism to restrict its extension and retraction, thus fixing the screen and keeping it stably suspended in its current position. Subsequently, the retraction mechanism can rotate in the opposite direction, resisting the locked telescopic mechanism and tightening the screen, making it flat and less prone to wrinkles or shaking, thus improving the user's viewing experience. When not in use, the power mechanism drives the telescopic mechanism to retract, and the retraction mechanism rotates to assist in retracting the screen. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the projection screen device provided in the embodiments of this application when the screen is unfolded;

[0017] Figure 2 A schematic diagram of the projection screen device provided in the embodiments of this application during screen retraction;

[0018] Figure 3 for Figure 2 The diagram shows the structure of the projection screen device after the storage box and cover are concealed.

[0019] Figure 4 for Figure 3 A partial structural cross-sectional view of the projection screen device shown;

[0020] Figure 5 for Figure 3 An exploded view of a portion of the projection screen device shown.

[0021] Figure 6 for Figure 3 An exploded view of the roll-up mechanism of the projection screen device shown.

[0022] Figure 7 A cross-sectional view of another rewinding mechanism for the projection screen device provided in the embodiments of this application.

[0023] The following are the labeling elements in the figure:

[0024] 10. Curtain;

[0025] 20. Rewinding mechanism; 21. First fixed bracket; 22. Reel; 23. Elastic element; 24. Second fixed bracket; 25. Connecting element; 26. First driver; 261. Housing; 262. Driver body; 263. Power output shaft; 27. Damping sleeve;

[0026] 30. Telescopic mechanism; 31. First link; 32. Second link; 33. Rotating shaft; 331. Shaft body; 332. Worm gear;

[0027] 40. Power mechanism; 41. Fixing component; 411. Fixing housing; 4111. Communicating hole; 4113. First housing; 4114. Second housing; 412. Mounting bracket; 4121. Support base; 4122. Connecting hole; 42. Power assembly; 421. Drive assembly; 4211. Rotary motor; 4212. Reduction gear set; 4213. Driven gear; 422. Rotating rod; 423. First limiting ring; 424. Second limiting ring;

[0028] 50. Main control board;

[0029] 60. Storage box; 61. Opening;

[0030] 70. Cover. Detailed Implementation

[0031] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0032] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0034] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] Combination Figure 1 , Figure 2 and Figure 3 As shown, this application embodiment provides a projection screen device, including a screen 10, a retraction mechanism 20, a telescopic mechanism 30, and a power mechanism 40. The retraction mechanism 20 is connected to one end of the screen 10 and is used to retract and unfold the screen 10. The telescopic mechanism 30 is connected to the screen 10, and the extension of the telescopic mechanism 30 is synchronized with the unfolding of the screen 10, and the retraction of the telescopic mechanism 30 is synchronized with the retraction of the screen 10. The power mechanism 40 is connected to the telescopic mechanism 30 and is used to drive the telescopic mechanism 30 to move and lock the telescopic mechanism 30.

[0036] In use, the power mechanism 40 drives the telescopic mechanism 30 to extend, and the retractable mechanism 20 rotates to assist in extending the screen 10, thereby unfolding the screen 10. When the screen 10 is unfolded to any desired extent, the power mechanism 40 locks the telescopic mechanism 30 to restrict its extension and retraction, thus fixing the screen 10 and keeping it stably suspended in the current position. Subsequently, the retractable mechanism 20 can rotate in the opposite direction to resist the locked telescopic mechanism 30, thereby tightening the screen 10, making it flat and less prone to wrinkles and shaking, improving the user's viewing experience. When not in use, the power mechanism 40 drives the telescopic mechanism 30 to retract, and the retractable mechanism 20 rotates to assist in retracting the screen 10.

[0037] It should be noted that the projection screen device provided in this application embodiment can be placed at a high place, such as a ceiling, wall, or the top of a vehicle, so that the screen 10 unfolds from top to bottom, or it can be placed at a low place, such as the ground or a tabletop, so that the screen 10 unfolds from bottom to top.

[0038] In one embodiment, the screen 10 has a front and a back side arranged opposite to each other. The front side of the screen 10 is used for display, and the telescopic mechanism 30 is disposed on the back side of the screen 10. By disposing the telescopic mechanism 30 on the back side of the screen 10, when the screen 10 is unfolded, it not only does not interfere with the content displayed on the front side of the screen 10, but the telescopic mechanism 30 can also be hidden, providing users with a better viewing experience. In addition, the telescopic mechanism 30 disposed on the back side of the screen 10 can also provide a certain degree of support for the screen 10, making the screen 10 flatter and less prone to shaking and curling.

[0039] In one embodiment, combined Figure 3 and Figure 4As shown, the power mechanism 40 includes a fixed component 41 and a power component 42 disposed on the fixed component 41; the telescopic mechanism 30 includes a first rod 31 and a second rod 32, the two ends of the first rod 31 are rotatably connected to one end of the fixed component 41 and one end of the second rod 32 respectively, and the other end of the second rod 32 is rotatably connected to the end of the curtain 10 away from the retraction mechanism 20; the power component 42 is used to drive the first rod 31 to rotate relative to the fixed component 41 or to lock the first rod 31.

[0040] For ease of explanation, assume that the curtain 10 unfolds from top to bottom. When the curtain 10 is in the retracted state, the first rod 31 and the second rod 32 fold, as shown in the diagram. Figure 3 As shown. In use, the power component 42 of the power mechanism 40 drives the first rod 31 to rotate relative to the fixed component 41. Since the second rod 32 is linked to the first rod 31, the second rod 32 will rotate relative to the first rod 31 and the curtain 10 under the drive of the first rod 31. The retraction mechanism 20 rotates in coordination to send out the curtain 10. The end of the curtain 10 away from the retraction mechanism 20 descends, realizing the unfolding of the curtain 10. During this process, the inferior angle formed between the first rod 31 and the second rod 32, that is, the angle greater than 0° and less than 180°, will gradually increase, showing the effect of the telescopic mechanism 30 being stretched in the height direction. When the end of the curtain 10 furthest from the retraction mechanism descends to any desired height, the power assembly 42 locks the first rod 31 to restrict its rotation relative to the fixed assembly 41. Since the second rod 32 is linked to the first rod 31, its rotation is also restricted, thus fixing the curtain 10 and keeping it stably suspended in its current position. Subsequently, the retraction mechanism 20 can rotate in the opposite direction to resist the locked telescopic mechanism 30, thereby lifting and tightening the curtain 10. When not in use, the power assembly 42 drives the first rod 31 to rotate in the opposite direction, which in turn drives the second rod 32 to rotate in the opposite direction, causing the telescopic mechanism 30 to retract. The retraction mechanism 20 rotates in coordination to retract the curtain 10, and the end of the curtain 10 furthest from the retraction mechanism 20 rises. During this process, the angle between the first rod 31 and the second rod 32 decreases, resulting in the telescopic mechanism 30 retracting in the height direction. After the 10 rolls of curtain are retracted, the first rod 31 and the second rod 32 are folded, resulting in a small overall size that is easy to store.

[0041] In one embodiment, such as Figure 3As shown, there are two telescopic mechanisms 30 and two power mechanisms 40. One end of the first rod 31 of each telescopic mechanism 30 is rotatably connected to the fixing component 41 of each power mechanism 40. The power components 42 of each power mechanism 40 cooperate with the first rod 31 of each telescopic mechanism 30, that is, they are used to drive their respective first rod 31 to rotate relative to the fixing component 41 and lock their respective first rod 31. By setting two telescopic mechanisms 30 along the width direction of the curtain 10, the support effect on the curtain 10 in the unfolded state can be enhanced, making the curtain 10 flatter and less prone to shaking and curling. By setting two power mechanisms 40, the power components 42 of each power mechanism 40 drive the extension and retraction of the two telescopic mechanisms 30 respectively, which can improve the stability of the curtain 10 when unfolding and retracting. The power components 42 of each power mechanism 40 lock the first rod 31 of each telescopic mechanism 30 respectively, which can make the structure of the telescopic mechanism 30 more stable and less prone to deformation, thereby enhancing the support and fixing effect on the curtain 10.

[0042] In one embodiment, combined Figure 4 and Figure 5As shown, a rotating shaft 33 is fixedly installed at the end of the first rod 31 away from the second rod 32. The rotating shaft 33 is rotatably connected to the fixed assembly 41. Helical teeth (not shown) are provided on the rotating shaft 33. The power assembly 42 includes a drive assembly 421 and a rotating rod 422. The power output end of the drive assembly 421 is connected to the rotating rod 422 and is used to drive the rotating rod 422 to rotate. Helical teeth (not shown) are provided on the rotating rod 422. The helical teeth mesh with the helical teeth for transmission. During operation, the drive assembly 421 drives the rotating rod 422 to rotate. The helical teeth on the rotating rod 422 mesh with the helical teeth on the rotating shaft 33 of the first rod 31, thereby driving the rotating shaft 33 and the first rod 31 to rotate. The first rod 31 then drives the second rod 32 to rotate, and the retraction mechanism 20 rotates to cooperate in sending out the curtain 10, thereby realizing the unfolding of the curtain 10. When the end of the curtain 10 away from the retraction reaches any desired height, the drive assembly 421 stops driving the rotating rod 422. The helical teeth on the rotating rod 422 and the helical teeth on the rotating shaft 33 can achieve a self-locking function. That is, when the drive assembly 421 stops driving the rotating rod 422, the rotating shaft 33 cannot rotate arbitrarily, but remains stationary, thereby locking the telescopic mechanism 30 and stabilizing the position of the curtain 10. Subsequently, the retraction mechanism 20 can be rotated in the opposite direction to resist the locked telescopic mechanism 30, thereby lifting and tightening the curtain 10 and preventing the curtain 10 from shaking. When not in use, the drive assembly 421 drives the rotating rod 422 to rotate in the opposite direction. The helical teeth on the rotating rod 422 mesh with the helical teeth on the rotating shaft 33 of the first rod 31, thereby driving the rotating shaft 33 and the first rod 31 to rotate in the opposite direction. The first rod 31 then drives the second rod 32 to rotate in the opposite direction, causing the telescopic mechanism 30 to retract, and the winding mechanism 20 to rotate and wind up the curtain 10. In this embodiment, the engagement of the helical teeth on the rotating rod 422 and the helical teeth on the rotating shaft 33 not only enables the driving of the telescopic mechanism 30 but also enables its locking. No additional locking mechanism is required, thus simplifying the device structure and reducing production costs.

[0043] Specifically, the first rod 31 and the rotating shaft 33 can be integrally formed, or they can be manufactured separately and then assembled and fixed.

[0044] Specifically, the rotating rod 422 is a worm gear, and the rotating shaft 33 includes a shaft body 331 and a worm wheel 332 disposed on the shaft body 331. The shaft body 331 is rotatably connected to the fixed assembly 41, and the worm wheel 332 rotates synchronously with the shaft body 331. The worm wheel 332 has helical teeth. The worm wheel 332 can be connected to the shaft body 331 by a key so that the worm wheel 332 and the shaft body 331 rotate synchronously. The worm wheel 332 and the shaft body 331 can also be integrally formed.

[0045] Specifically, the drive assembly 421 includes a rotary motor 4211, a reduction gear set 4212, and a driven gear 4213. The power output end of the rotary motor 4211 is connected to the reduction gear set 4212 to drive the reduction gear set 4212 to rotate. The reduction gear set 4212 meshes with the driven gear 4213 for transmission. The driven gear 4213 is sleeved on the rotating rod 422, and the driven gear 4213 rotates synchronously with the rotating rod 422. More specifically, the driven gear 4213 has a square hole, through which it is sleeved on the rotating rod 422. The cross-section of the part where the rotating rod 422 and the driven gear 4213 are sleeved is square, thereby enabling the driven gear 4213 to rotate synchronously with the rotating rod 422.

[0046] In one embodiment, such as Figure 5 As shown, the fixing component 41 includes a fixing housing 411 and a mounting bracket 412. The driving component 421 is disposed within the fixing housing 411. The fixing housing 411 has a connecting hole 4111. One end of the rotating rod 422, away from the driving component 421, extends out of the fixing housing 411 through the connecting hole 4111. The mounting bracket 412 is disposed on the outside of the fixing housing 411. The mounting bracket 412 has two support seats 4121 arranged relatively apart. Each support seat 4121 has a connecting hole 4122. Both ends of the rotating shaft 33 rotatably pass through the connecting holes 4122 of the two support seats 4121. By setting the fixing housing 411, the driving component 421 is disposed inside the fixing housing 411, which can protect the driving component 421 and provide a good working environment for the driving component 421. By opening the connecting hole 4111 in the fixing housing 411, the rotating rod 422 can extend out of the fixing housing 411 through the connecting hole 4111 to connect with the rotating shaft 33. By providing a mounting bracket 412 on the fixed housing 411, the mounting bracket 412 has two support seats 4121 arranged relatively apart. The support seats 4121 are provided with connecting holes 4122, so that both ends of the rotating shaft 33 pass through the connecting holes 4122 of the two support seats 4121 respectively, thereby realizing the rotatable connection between the rotating shaft 33 and the mounting bracket 412. Specifically, the mounting bracket 412 and the fixed housing 411 can be fixed with screws.

[0047] In one embodiment, such as Figure 5 As shown, the fixed housing 411 includes a first housing 4113 and a second housing 4114. The first housing 4113 and the second housing 4114 are detachably connected, forming an installation space. The drive assembly 421 is disposed within the installation space, and the mounting bracket 412 is disposed on the side of the first housing 4113 facing away from the second housing 4114. The detachability of the first housing 4113 and the second housing 4114 facilitates the assembly and disassembly of the drive assembly 421. The first housing 4113 and the second housing 4114 can be fixed together with screws.

[0048] In one embodiment, combined Figure 4 and Figure 5 As shown, a protrusion is provided on the outer periphery of the rotating rod 422, and the driven gear 4213 is sleeved on the protrusion. The power assembly 42 also includes a first limiting ring 423 and a second limiting ring 424. The first limiting ring 423 and the second limiting ring 424 are both sleeved on the rotating rod 422 and are located on opposite sides of the protrusion. One side of the first limiting ring 423 abuts against the first housing 4113, and the other side of the first limiting ring 423 abuts against one side of the driven gear 4213 and one side of the protrusion. One side of the second limiting ring 424 abuts against the second housing 4114, and the other side of the second limiting ring 424 abuts against the other side of the driven gear 4213 and the other side of the protrusion, thereby enabling axial positioning of the driven gear 4213 and the rotating rod 422.

[0049] In one embodiment, the projection screen device further includes a control system electrically connected to the drive assembly 421 and capable of controlling the start and stop of the drive assembly 421. The control system includes an abnormal current monitoring module for monitoring the current of the drive assembly 421 during operation. During the unfolding of the screen 10, when the screen 10 encounters an obstacle, the rotation of the pivot 33 and the rotating rod 422 is obstructed, causing an abnormal current to be generated in the drive assembly 421. The abnormal current monitoring module can monitor the current of the drive assembly 421 during operation. When an abnormal operating current of the drive assembly 421 is detected, the control system controls the drive assembly 421 to stop operating, stopping the drive assembly 421 from driving the rotating rod 422 to rotate, thus preventing the screen 10 from continuing to unfold and colliding with the obstacle, thereby achieving an anti-collision function. In actual operation, when the abnormal current monitoring module detects an abnormal operating current of the drive assembly 421, the control system can also control the drive assembly 421 to drive the rotating rod 422 to rotate in the opposite direction, causing the telescopic mechanism 30 to retract and the winding mechanism 20 to rotate to cooperate in winding up the screen 10, moving the screen 10 away from the obstacle. Specifically, there are two abnormal current monitoring modules. These two modules are used to monitor the operating current of the drive components 421 of the two power mechanisms 40, respectively, to improve the reliability of the anti-collision function. Specifically, such as... Figure 3 As shown, the control system includes a main control board 50, which is electrically connected to the drive assembly 421 and can control the start / stop, speed, and direction of rotation of the rotating rod 422 through the drive assembly 421.

[0050] In one embodiment, the control system can also be electrically connected to the winding mechanism 20 to control the start and stop of the winding mechanism. During the unfolding of the curtain 10, when the abnormal current monitoring module detects an abnormal operating current of the drive component 421, the control system controls the drive component 421 to stop running on the one hand, and controls the winding mechanism 20 to stop running on the other hand, so as to prevent the winding mechanism 20 from continuing to deliver the curtain 10.

[0051] In one embodiment, combined Figure 3 and Figure 6 As shown, the winding mechanism 20 includes a first fixed bracket 21, a roller 22, and an elastic element 23. The roller 22 is rotatably connected to the first fixed bracket 21 and connected to one end of the curtain 10. The elastic element 23 is connected to the first fixed bracket 21 and the roller 22. When the power mechanism 40 drives the telescopic mechanism 30 to extend, thereby causing the curtain 10 to unfold, the roller 22 rotates relative to the first fixed bracket 21 in a first clockwise direction, and the elastic element 23 undergoes elastic deformation. When the elastic element 23 returns to its original state, it can drive the roller 22 to rotate in the opposite direction of the first clockwise direction. During operation, the power mechanism 40 drives the telescopic mechanism 30 to extend, which in turn pulls the curtain 10. The curtain 10 causes the roller 22 to rotate relative to the first fixed bracket 21 in a clockwise direction. As the roller 22 rotates, it extends the curtain 10, thus unfolding it. During this process, the elastic element 23 undergoes elastic deformation. When the curtain 10 is unfolded to the desired extent, the power mechanism 40 locks the telescopic mechanism 30. At this point, the elastic element 23 tends to return to its original shape, driving the roller 22 to rotate in the opposite direction of the clockwise direction, thus resisting the locked telescopic mechanism 30 and tightening the curtain 10, preventing it from swaying. This embodiment utilizes the elasticity of the elastic element 23 to automatically tighten the curtain 10, eliminating the need for an additional power device to drive the roller 22 to rotate in the opposite direction of the clockwise direction to tighten the curtain 10. This simplifies the device structure and reduces production costs.

[0052] Specifically, one end of the spool 22 is rotatably connected to the first fixed bracket 21. The winding mechanism 20 also includes a second fixed bracket 24 and a connector 25. The connector 25 is rotatably connected to the second fixed bracket 24 and fixedly connected to the end of the spool 22 away from the first fixed bracket 21. The spool 22 is tubular, and the elastic element 23 is a spring. The spring is disposed inside the spool 22, and its two ends are fixedly connected to the first fixed bracket 21 and the moving bracket, respectively. When the spool 22 rotates relative to the first fixed bracket 21 in a first clockwise direction, the connector 25 will rotate together with the spool 22 relative to the second fixed bracket 24 in a first clockwise direction. When the connector 25 rotates relative to the first fixed bracket 21, it will cause the spring to twist to accumulate energy. When the spring returns to its original state, it can drive the moving bracket and the spool 22 to rotate in the opposite direction of the first clockwise direction.

[0053] As an alternative, such as Figure 7 As shown, the winding mechanism 20 includes a reel 22, a first driver 26, and a damping sleeve 27. The reel 22 is connected to one end of the curtain 10. The first driver 26 includes a housing 261, a driver body 262, and a power output shaft 263. The driver body 262 is disposed inside the housing 261 and is connected to the power output shaft 263 and is used to drive the power output shaft 263 to rotate. The power output shaft 263 is fixedly connected to the reel 22. The damping sleeve 27 is fixedly connected to the housing 261 and is sleeved on the power output shaft 263. During operation, the power mechanism 40 drives the telescopic mechanism 30 to extend, and the telescopic mechanism 30 pulls the curtain 10. At the same time, the driver body 262 drives the power output shaft 263 to rotate, and the power output shaft 263 drives the roller 22 to rotate to help send the curtain 10 out, thereby realizing the unfolding of the curtain 10. When the curtain 10 is unfolded to the required extent, the power mechanism 40 first locks the telescopic mechanism 30 to fix the curtain 10. Then, the driver body 262 drives the power output shaft 263 to rotate in the opposite direction, and the power output shaft 263 drives the roller 22 to rotate in the opposite direction to tighten the curtain 10, making the curtain 10 flat and wrinkle-free. Then, the driver body 262 can be powered off to stop operation to meet the needs of energy saving and consumption reduction. The friction force of the damping sleeve 27 acting on the power output shaft 263 prevents the roller 22 from rotating arbitrarily, but keeps it in a stationary state, thereby keeping the curtain 10 taut and preventing the curtain 10 from shaking. Specifically, the driver body 262 may include a motor and a reduction mechanism, with the motor connected to the power output shaft 263 via the reduction mechanism. Specifically, the reel 22 is tubular, and the first driver 26 may be installed inside one end of the reel 22. The first fixed bracket 21 is rotatably connected to the end of the reel 22 away from the first driver 26.

[0054] As an alternative, the winding mechanism 20 may include a reel 22 and a second driver. The reel 22 is connected to one end of the screen 10, and the power output end of the second driver is connected to the reel 22 and used to drive the reel 22 to rotate. The second driver includes a brushless iron core motor. The brushless iron core motor has the characteristic of cogging torque, also known as positioning torque, which always attempts to position the rotor at a certain position, thereby achieving a self-locking function. As long as the brushless iron core motor stops running, the reel 22 cannot rotate arbitrarily, but remains stationary, thus stabilizing the position of the screen 10 and preventing the screen 10 from shaking. In actual operation, when the curtain 10 is unfolded to the required extent, the telescopic mechanism 30 is first locked by the power mechanism 40 to fix the curtain 10. Then, the brushless iron core motor of the winding mechanism 20 drives the roller 22 to rotate in the opposite direction to tighten the curtain 10, making the curtain 10 flat and wrinkle-free. Subsequently, the brushless iron core motor can be de-energized to stop operation, in order to meet the requirements of energy saving and consumption reduction. Its self-locking function keeps the roller 22 stationary, thereby keeping the curtain 10 taut. Specifically, the second driver also includes a planetary gear mechanism. The brushless iron core motor drives the roller 22 through the planetary gear mechanism, which plays a role in speed reduction and torque increase. Specifically, the roller 22 is tubular, and the second driver can be installed in one end of the roller 22. The first fixed bracket 21 is rotatably connected to the end of the roller 22 away from the second driver.

[0055] In one embodiment, combined Figure 1 and Figure 2 As shown, the projection screen device also includes a storage box 60 with an opening 61. The winding mechanism 20 and the power mechanism 40 are both housed within the storage box 60. The screen 10 and the telescopic mechanism 30 can extend out of and retract into the storage box 60 through the opening 61. By providing the storage box 60, the winding mechanism 20, locking mechanism, screen 10, and telescopic mechanism 30 are all housed within it, facilitating the installation and transport of the projection screen device. Specifically, the main control board 50 is housed within the storage box 60. The first fixed bracket 21 of the winding mechanism 20 is fixedly connected to the storage box 60. When the winding mechanism 20 includes a first driver 26 or a second driver, the first driver 26 or the second driver is fixedly connected to the storage box 60. The fixing component 41 of the power mechanism 40 is fixedly connected to the storage box 60. The storage box 60 can be installed at a high place, such as the ceiling, wall, or the top of a car, so that the curtain 10 can be unfolded from top to bottom, or it can be placed at a low place, such as the ground or a tabletop, so that the curtain 10 can be unfolded from bottom to top.

[0056] In one embodiment, such as Figure 2As shown, a cover 70 is fixedly provided at the end of the curtain 10 away from the retraction mechanism 20. When the curtain 10 and the telescopic mechanism 30 are stored in the storage box 60, the cover 70 covers the opening 61 of the storage box 60, which improves the aesthetics and prevents impurities from entering the storage box 60. Specifically, the end of the second rod 32 away from the first rod 31 is rotatably connected to the cover 70.

[0057] It should be noted that the above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A projection screen device, characterized in that, The device includes a curtain, a retraction mechanism, a telescopic mechanism, and a power mechanism. The retraction mechanism is connected to one end of the curtain and is used to retract and unfold the curtain. The telescopic mechanism is connected to the curtain, and its extension is synchronized with the unfolding of the curtain. Its retraction is synchronized with the retraction of the curtain. The power mechanism is connected to the telescopic mechanism and is used to drive the telescopic mechanism to move and lock the telescopic mechanism.

2. The projection screen device according to claim 1, characterized in that: The power mechanism includes a fixed component and a power component disposed on the fixed component; the telescopic mechanism includes a first rod and a second rod, the two ends of the first rod are respectively rotatably connected to one end of the fixed component and one end of the second rod, and the other end of the second rod is rotatably connected to the end of the curtain away from the retraction mechanism; the power component is used to drive the first rod to rotate relative to the fixed component and to lock the first rod.

3. The projection screen device according to claim 2, characterized in that: The first rod has a rotating shaft fixedly installed at the end away from the second rod. The rotating shaft is rotatably connected to the fixed assembly and has helical teeth. The power assembly includes a drive assembly and a rotating rod. The power output end of the drive assembly is connected to the rotating rod and is used to drive the rotating rod to rotate. The rotating rod has helical teeth, which mesh with the helical teeth for transmission.

4. The projection screen device according to claim 3, characterized in that: The rotating rod is a worm gear, and the rotating shaft includes a shaft body and a worm wheel disposed on the shaft body. The shaft body is rotatably connected to the fixed component, and the worm wheel rotates synchronously with the shaft body. The worm wheel has the helical teeth.

5. The projection screen device according to claim 3, characterized in that: The projection screen device also includes a control system, which is electrically connected to the drive component and can control the start and stop of the drive component. The control system includes an abnormal current monitoring module, which is used to monitor the current when the drive component is working.

6. The projection screen device according to claim 2, characterized in that: There are two telescopic mechanisms and two power mechanisms. One end of the first rod of each of the two telescopic mechanisms is rotatably connected to the fixed component of each of the two power mechanisms. The power components of each of the two power mechanisms cooperate with the first rod of each of the two telescopic mechanisms.

7. The projection screen device according to any one of claims 1-6, characterized in that: The winding mechanism includes a first fixed bracket, a roller, and an elastic element. The roller is rotatably connected to the first fixed bracket and to one end of the curtain. The elastic element is connected to the first fixed bracket and the roller. When the power mechanism drives the telescopic mechanism to extend, thereby unfolding the curtain, the roller rotates relative to the first fixed bracket in a first clockwise direction, and the elastic element undergoes elastic deformation. When the elastic element returns to its original shape, it can drive the roller to rotate in a direction opposite to the first clockwise direction.

8. The projection screen device according to claim 7, characterized in that: One end of the reel is rotatably connected to the first fixed bracket. The winding mechanism also includes a second fixed bracket and a connector. The connector is rotatably connected to the second fixed bracket and fixedly connected to the end of the reel away from the first fixed bracket. The reel is tubular. The elastic element is a spring. The spring is disposed inside the reel, and both ends of the spring are fixedly connected to the first fixed bracket and the connector, respectively.

9. The projection screen device according to any one of claims 1-6, characterized in that: The winding mechanism includes a reel, a first driver, and a damping sleeve. The reel is connected to one end of the curtain. The first driver includes a housing, a driver body, and a power output shaft. The driver body is disposed inside the housing and is connected to the power output shaft for driving the power output shaft to rotate. The power output shaft is fixedly connected to the reel. The damping sleeve is fixedly connected to the housing and sleeved on the power output shaft.

10. The projection screen device according to any one of claims 1-6, characterized in that: The winding mechanism includes a roller and a second driver. The roller is connected to one end of the curtain, and the power output end of the second driver is connected to the roller and used to drive the roller to rotate. The second driver includes a brushless iron core motor.

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