Projection curtain device

Abstract

The invention 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 locking mechanism, the winding mechanism is connected to one end of the curtain and used for winding and unfolding the curtain, and the telescopic mechanism is connected to the curtain and used for locking the curtain. And the telescopic mechanism can extend along with the extension of the curtain and retract along with the rolling of the curtain, and the locking mechanism is used for locking the telescopic mechanism. When the curtain is unfolded to any required degree, the telescopic mechanism is locked by the locking mechanism to limit the extension and contraction of the telescopic mechanism, so that the curtain can be fixed, the curtain can be stably suspended at the current position, and then the winding mechanism can be reversely rotated, so that the curtain can be fixed to any required degree. When the curtain is locked, the locking mechanism forms resistance with the telescopic mechanism in the locked state, so that the curtain can be tensioned, the curtain is flat and not prone to wrinkling and shaking, and the watching experience of a user is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of projection equipment, and specifically relates to a projection screen device. Background Art

[0002] Existing projection screen devices generally use a motor to drive a reel to rotate, thereby achieving the unfolding and retracting of the projection screen. However, the unfolded projection screen is prone to wrinkles and shaking, affecting the user's viewing experience. Summary of the invention

[0003] The purpose of the present application is to provide a projection screen device, aiming to solve the technical problem in the prior art that the projection screen is prone to wrinkles and shaking when unfolded.

[0004] To achieve the above-mentioned purpose, the technical solution adopted in the present application is: a projection screen device, including a screen, a retracting mechanism, a telescopic mechanism and a locking mechanism, the retracting mechanism is connected to one end of the screen and is used to retract and unfold the screen, the telescopic mechanism is connected to the screen and can extend as the screen is unfolded and contract as the screen is retracted, and the locking mechanism is used to lock the telescopic mechanism.

[0005] Furthermore, the locking mechanism includes a fixing component and a locking component arranged on the fixing component; the telescopic mechanism includes a first rod and a second rod, both ends of the first rod are rotatably connected to the fixing component and one end of the second rod respectively, and the other end of the second rod is rotatably connected to an end of the curtain away from the retracting mechanism, and the locking component is used to lock the first rod to limit the rotation of the first rod relative to the fixing component.

[0006] Furthermore, a rotating shaft is fixedly provided at one end of the first rod member away from the second rod member, and the rotating shaft is rotatably connected to the fixing component; the locking component includes a first limiting component, a second limiting component and a clamping component, and the first limiting component and the second limiting component are respectively arranged on opposite sides of the rotating shaft, and the clamping component can move in a direction close to the first limiting component to clamp the second limiting component, and move in a direction away from the first limiting component to loosen the second limiting component.

[0007] Furthermore, the locking assembly also includes a rotating column and a driving assembly, the clamping piece is threadedly sleeved on the rotating column, the power output end of the driving assembly is connected to the rotating column and is used to drive the rotating column to rotate, thereby driving the clamping piece to move linearly in a direction close to or away from the first limit piece.

[0008] Furthermore, a rotating shaft is fixedly provided at one end of the first rod away from the second rod, and the rotating shaft is rotatably connected to the fixed component; the projection screen device also includes a control circuit board and an anti-collision detection mechanism, the control circuit board is electrically connected to the retracting mechanism and the anti-collision detection mechanism, and the anti-collision detection mechanism is used to detect the angle of the rotating shaft.

[0009] Furthermore, the number of the telescopic mechanisms and the number of the anti-collision detection mechanisms are both two, and the two anti-collision detection mechanisms are respectively used to detect the angles of the rotation axes of the two telescopic mechanisms.

[0010] Furthermore, the telescopic mechanism also includes an extension power assembly, which is connected to the first rod and the second rod, and is used to drive the first rod and the second rod to rotate to unfold the curtain.

[0011] Furthermore, the first rod and the second rod are rotatably connected via a hinge shaft; the extension power assembly includes a tension spring and a pull rope, one end of the tension spring is fixed to the second rod, the other end of the tension spring is fixed to one end of the pull rope, and the other end of the pull rope is fixed to the first rod after passing through the side of the hinge shaft.

[0012] Furthermore, the reeling 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 casing, a driver body and a power output shaft, the driver body is arranged in the casing, the driver body is connected to the power output shaft and is used to drive the power output shaft to rotate, the power output shaft is fixedly connected to the reel, and the damping sleeve is fixedly connected to the casing and is sleeved on the power output shaft.

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

[0014] Compared with the prior art, the projection screen device provided by the present application has the following beneficial effects: when in use, the retracting mechanism is rotated to unfold the screen, and the telescopic mechanism can be extended as the screen is unfolded. When the screen is unfolded to any desired degree, the telescopic mechanism is locked by the locking mechanism to limit the extension and contraction of the telescopic mechanism, thereby fixing the screen and making it stably hover at the current position. Then, the retracting mechanism can be rotated in the opposite direction to form resistance with the telescopic mechanism in the locked state, thereby tightening the screen, making the screen flat and not prone to wrinkles and shaking, and improving the user's viewing experience. When not in use, the locking mechanism is used to release the telescopic mechanism, and the retracting mechanism is rotated to retract the screen, and the telescopic mechanism shrinks as the screen is retracted. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1A schematic diagram of the structure of the projection screen device provided in an embodiment of the present application when the screen is unfolded;

[0017] Figure 2 A schematic diagram of the structure of the projection screen device provided in an embodiment of the present application when the screen is rolled up;

[0018] Figure 3 for Figure 2 The structure diagram of the projection screen device shown is after the storage box is hidden;

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

[0020] Figure 5 for Figure 3 A partial structural sectional view of the projection screen device shown;

[0021] Figure 6 for Figure 4 A partial structural exploded view of the projection screen device shown;

[0022] Figure 7 for Figure 1 A cross-sectional view of the telescopic mechanism of the projection screen device shown;

[0023] Figure 8 for Figure 3 A cross-sectional view of the retracting mechanism of the projection screen device is shown.

[0024] Among them, the reference numerals in the figure are:

[0025] 10. Curtain;

[0026] 20. Winding mechanism; 21. Reel; 22. First driver; 221. Casing; 222. Driver body; 223. Power output shaft; 23. Fixed bracket; 24. Damping sleeve;

[0027] 30. telescopic mechanism; 31. first rod; 32. second rod; 33. extension power assembly; 331. tension spring; 332. pull rope; 34. hinge shaft; 35. rotating shaft;

[0028] 40. Locking mechanism; 41. Fixing assembly; 411. Fixing housing; 4111. First housing; 4112. Second housing; 4113. Connecting hole; 412. Cover plate; 413. Connecting seat; 4131. Connecting hole; 42. Locking assembly; 421. First stopper; 422. Second stopper; 4221. Stop groove; 423. Rotating column; 424. Pressing member; 425. Driving assembly; 4251. Rotating motor; 4252. Reduction gear set; 4253. Driven gear; 426. Axial stopper; 427. Gasket; 428. Plane bearing; 429. First stopper ring; 430. Second stopper ring;

[0029] 50. Control circuit board;

[0030] 60. Anti-collision detection mechanism;

[0031] 70. Storage box; 71. Opening;

[0032] 80. Capping. DETAILED DESCRIPTION

[0033] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0034] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] Combination Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of the present application provides a projection screen device, including a screen 10, a retracting mechanism 20, a telescopic mechanism 30 and a locking mechanism 40. The retracting 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 can extend as the screen 10 is unfolded and contract as the screen 10 is retracted. The locking mechanism 40 is used to lock the telescopic mechanism 30.

[0038] When in use, the retracting mechanism 20 is rotated to unfold the curtain 10, and the telescopic mechanism 30 can be extended as the curtain 10 is unfolded. When the curtain 10 is unfolded to any desired degree, the telescopic mechanism 30 is locked by the locking mechanism 40 to limit the extension and contraction of the telescopic mechanism 30, so that the curtain 10 can be fixed and stably suspended at the current position. Then, the retracting mechanism 20 can be rotated in the opposite direction to form resistance with the telescopic mechanism 30 in the locked state, so that the curtain 10 can be tightened, so that the curtain 10 is flat and not prone to wrinkles and shaking, thereby improving the user's viewing experience. When not in use, the locking mechanism 40 releases the telescopic mechanism 30, and the retracting mechanism 20 rotates to retract the curtain 10, and the telescopic mechanism 30 shrinks as the curtain 10 is retracted.

[0039] It should be noted that the projection screen device provided in the embodiment of the present application can be placed in a high place, such as a ceiling, a wall, a top of a car, etc., so that the screen 10 can be unfolded from top to bottom, or it can be placed in a low place, such as the ground, a table, etc., so that the screen 10 can be unfolded from bottom to top.

[0040] In one embodiment, the screen 10 has a front and a back side that are arranged opposite to each other, the front side of the screen 10 is used for display, and the telescopic mechanism 30 is arranged on the back side of the screen 10. By arranging the telescopic mechanism 30 on the back side of the screen 10, when the screen 10 is unfolded, it will not only not interfere with the display content on the front side of the screen 10, but also hide the telescopic mechanism 30, providing a better viewing experience for the user. In addition, the telescopic mechanism 30 arranged on the back side of the screen 10 can also play a certain supporting role for the screen 10, making the screen 10 more flat and less prone to shaking and curling.

[0041] In one embodiment, in combination Figure 3 and Figure 4 As shown, the locking mechanism 40 includes a fixing component 41 and a locking component 42 arranged on the fixing component 41; the telescopic mechanism 30 includes a first rod 31 and a second rod 32, both ends of the first rod 31 are rotatably connected to the fixing component 41 and one end of the second rod 32 respectively, and the other end of the second rod 32 is rotatably connected to an end of the curtain 10 away from the retracting mechanism 20, and the locking component 42 is used to lock the first rod 31 to limit the rotation of the first rod 31 relative to the fixing component 41.

[0042] For the sake of convenience, it is assumed that the curtain 10 is unfolded from top to bottom. When the curtain 10 is in the retracted state, the first rod 31 and the second rod 32 are folded, and the folding effect is as follows: Figure 3 When in use, the retracting mechanism 20 rotates to unfold the curtain 10, and the end of the curtain 10 away from the retracting mechanism 20 descends. During this process, the second rod 32 rotates relative to the curtain 10, and the first rod 31 rotates relative to the second rod 32 and the fixing assembly 41 of the locking mechanism 40. 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°, gradually increases, presenting an effect that the telescopic mechanism 30 is stretched in the height direction. When the end of the curtain 10 away from the retracted state is lowered to any desired height, the locking component 42 of the locking mechanism 40 locks the first rod 31 to limit the rotation of the first rod 31 relative to the fixing component 41. Since the second rod 32 is linked to the first rod 31, the rotation of the second rod 32 can also be limited, so that the curtain 10 can be fixed and stably suspended at the current position. Then, the retracting mechanism 20 rotates in the opposite direction to form a resistance with the telescopic mechanism 30 in the locked state, so that the curtain 10 can be lifted and tightened. When not in use, the locking assembly 42 releases the telescopic mechanism 30, the first rod 31 and the second rod 32 resume a rotatable state, the retracting mechanism 20 retracts the curtain 10, and the end of the curtain 10 away from the retracting mechanism 20 rises. During this process, the second rod 32 rotates relative to the curtain 10, and the first rod 31 rotates relative to the second rod 32 and the fixing assembly 41. The inferior angle formed between the first rod 31 and the second rod 32 is reduced, showing the effect of the telescopic mechanism 30 shrinking in the height direction. When the curtain 10 is completely retracted, the first rod 31 and the second rod 32 are folded, and the overall size is small, which is convenient for storage.

[0043] In one embodiment, Figure 1As shown, there are two telescopic mechanisms 30, and the two telescopic mechanisms 30 are arranged at intervals along the width direction of the curtain 10. By arranging two telescopic mechanisms 30 along the width direction of the curtain 10, not only can the supporting effect of the curtain 10 in the unfolded state be enhanced, making the curtain 10 more flat and less prone to shaking and curling, but also the stability of the curtain 10 when it is displayed and rolled up can be improved.

[0044] In one embodiment, Figure 7 As shown, the telescopic mechanism 30 further includes an extension power assembly 33, which is connected to the first rod 31 and the second rod 32 and is used to drive the first rod 31 and the second rod 32 to rotate so as to unfold the curtain 10. When the curtain 10 and the telescopic mechanism 30 are light in weight, it is difficult to ensure that the curtain 10 can fall smoothly and stably by rotating the retracting mechanism 20 to deliver the curtain 10. However, by setting the extension power assembly 33 to be connected to the first rod 31 and the second rod 32, the extension power assembly 33 is used to drive the first rod 31 and the second rod 32 to rotate so that the curtain 10 is unfolded from top to bottom, providing power for the curtain 10 to fall, thereby ensuring that the curtain 10 can fall smoothly and stably. In addition, the extension power assembly 33 can also make the unfolded curtain 10 tighter, making the curtain 10 flatter and less prone to wrinkles and shaking. Of course, when the projection screen device is placed at a low place, such as the ground, a table, etc., the extension power assembly 33 can be used to drive the first rod 31 and the second rod 32 to rotate so that the screen 10 can be unfolded from bottom to top. Both telescopic mechanisms 30 include an extension power assembly 33, and the two extension power assemblies 33 can provide the same driving force for the first rod 31 and the second rod 32 connected to each other, thereby ensuring that the screen 10 can always move in a straight line along the direction of its own vertical center line during the unfolding and retracting process without being easily shaken left and right.

[0045] In one embodiment, Figure 7 As shown, the first rod 31 and the second rod 32 are rotatably connected via a hinge shaft 34; the extension power assembly 33 includes a tension spring 331 and a pull rope 332, one end of the tension spring 331 is fixed to the second rod 32, the other end of the tension spring 331 is fixed to one end of the pull rope 332, and the other end of the pull rope 332 is fixed to the first rod 31 after passing through the side of the hinge shaft 34.

[0046] During the process of unfolding and retracting the curtain 10, the tension spring 331 is always in a stretched state. Through the cooperation of the hinge shaft 34, the tension spring 331 and the pull rope 332, the first rod 31 and the second rod 32 can always rotate to unfold the curtain 10. Taking the unfolding direction of the curtain 10 as an example, the cooperation of the hinge shaft 34, the tension spring 331 and the pull rope 332 can always make the first rod 31 and the second rod 32 have a downward extension trend, that is, the inferior angle formed between the first rod 31 and the second rod 32 always has a tendency to increase. When the locking assembly 42 releases the telescopic mechanism 30, the first rod 31 and the second rod 32 can rotate under the elastic force of the tension spring 331, realize the automatic extension of the telescopic mechanism 30, and provide power for the curtain 10 to fall. When the curtain 10 is retracted, it is necessary to overcome the elasticity of the tension spring 331 to fold the first rod 31 and the second rod 32. In some other embodiments, the extension power assembly 33 may also be a compression spring, the two ends of which are respectively connected to the first rod 31 and the second rod 32, the compression spring is always in a compressed state, and the compression spring makes the first rod 31 and the second rod 32 always have a movement tendency to rotate to unfold the curtain 10. The extension power assembly 33 may also be a torsion spring, the two ends of which are respectively connected to the first rod 31 and the second rod 32, the torsion spring always stores angular energy, and the torsion spring makes the first rod 31 and the second rod 32 always have a movement tendency to rotate to unfold the curtain 10.

[0047] Specifically, the first rod 31 and the second rod 32 are both provided with a lumen, and the tension spring 331 is arranged in the lumen of the first rod 31. One end of the pull rope 332 is located in the lumen of the first rod 31 and is connected to the tension spring 331, and the other end of the pull rope 332 is fixed in the lumen of the second rod 32. In this way, the tension spring 331 and the pull rope 332 can be prevented from being exposed, which not only plays a role in storing and protecting the tension spring 331 and the pull rope 332, but also can improve the aesthetics of the projection screen device.

[0048] In one embodiment, in combination Figure 4 and Figure 5 As shown, a rotating shaft 35 is fixedly provided at one end of the first rod member 31, and the rotating shaft 35 is rotatably connected to the fixed component 41 of the locking mechanism 40; the locking component 42 of the locking mechanism 40 includes a first limiting member 421, a second limiting member 422 and a clamping member 424, the first limiting member 421 and the second limiting member 422 are respectively arranged on opposite sides of the rotating shaft 35, and the clamping member 424 is arranged on the side of the second limiting member 422 facing away from the rotating shaft 35, and the clamping member 424 can move in a direction close to the first limiting member 421 to clamp the second limiting member 422, and move in a direction away from the first limiting member 421 to loosen the second limiting member 422.

[0049] During use, when the curtain 10 is unfolded to any desired extent, the pressing member 424 is moved toward the direction close to the first limiting member 421 to press the second limiting member 422, and the second limiting member 422 cooperates with the first limiting member 421 to lock the rotating shaft 35, thereby limiting the rotation of the first rod 31 relative to the fixed component 41. It can be understood that the first rod 31 and the second rod 32 are in a linked relationship. When the first rod 31 is restricted from rotating, the second rod 32 is also restricted from rotating, that is, the locking component 42 can simultaneously limit the rotation of the first rod 31 and the second rod 32 by clamping the rotating shaft 35, without the need to separately lock the first rod 31 and the second rod 32, thereby simplifying the device structure and reducing the production cost. When not in use, the pressing member 424 is moved away from the first limiting member 421 to release the second limiting member 422. The second limiting member 422 thus releases the rotating shaft 35, and the first rod 31 and the second rod 32 resume a rotatable state. The retracting mechanism 20 rotates to retract the curtain 10. The first rod 31 and the second rod 32 rotate as the curtain 10 is retracted. When the curtain 10 is completely retracted, the first rod 31 and the second rod 32 are folded.

[0050] Specifically, the first rod 31 and the rotating shaft 35 can be integrally formed, or can be separately manufactured and then assembled and fixed.

[0051] Specifically, the first stopper 421 and the second stopper 422 lightly contact the outer surface of the rotating shaft 35 in the initial position, which not only does not limit the rotation of the rotating shaft 35, but also can support the rotating shaft 35, making the rotating shaft 35 more stable when rotating. When the pressing member 424 presses the second stopper 422, the friction between the second stopper 422 and the rotating shaft 35 can be increased, thereby limiting the rotation of the rotating shaft 35.

[0052] Specifically, there are two locking mechanisms 40, and the first rods 31 of the two telescopic mechanisms 30 are respectively rotatably connected to the fixing components 41 of the two locking mechanisms 40, and the locking components 42 of the two locking mechanisms 40 are respectively used to lock the rotating shafts 35 of the two telescopic mechanisms 30. By locking the rotating shafts 35 of the two telescopic mechanisms 30 at the same time, the structure of the telescopic mechanism 30 can be made more stable and less prone to deformation, thereby enhancing the support and fixing effect of the curtain 10.

[0053] In one embodiment, Figure 5 As shown, the locking assembly 42 also includes a rotating column 423 and a driving assembly 425. The clamping member 424 is threadedly mounted on the rotating column 423. The power output end of the driving assembly 425 is connected to the rotating column 423 and is used to drive the rotating column 423 to rotate, thereby driving the clamping member 424 to move linearly in a direction close to or away from the first limit member 421.

[0054] When the rotating shaft 35 needs to be locked, the driving assembly 425 drives the rotating column 423 to rotate, and the threaded cooperation between the rotating column 423 and the pressing member 424 enables the pressing member 424 to move linearly along the axial direction of the rotating column 423 and in the direction close to the first stopper 421, thereby pressing the second stopper 422 to achieve the locking of the rotating shaft 35. When the rotating shaft 35 needs to be released, the driving assembly 425 drives the rotating column 423 to rotate in the opposite direction, and the pressing member 424 moves linearly in the direction away from the first stopper 421 to loosen the second stopper 422 and the rotating shaft 35. The operation is simple and convenient. The threaded cooperation between the rotating column 423 and the pressing member 424 can achieve a self-locking function, that is, when the driving assembly 425 stops driving the rotating column 423, the pressing member 424 cannot move at will, but maintains a stationary state, thereby being able to keep pressing the second stopper 422. Specifically, the pressing member 424 is a nut, and the rotating column 423 is a single-head screw, that is, there is only a single spiral groove on the screw.

[0055] In one embodiment, in combination Figure 5 and Figure 6 As shown, a rotation-stop groove 4221 is provided on the side of the second stopper 422 facing away from the first stopper 421, and a pressing member 424 is arranged in the rotation-stop groove 4221, and the rotation-stop groove 4221 can limit the rotation of the pressing member 424. By providing the rotation-stop groove 4221 on the side of the second stopper 422 facing away from the first stopper 421 and arranging the pressing member 424 in the rotation-stop groove 4221, the pressing member 424 can be prevented from rotating with the rotation of the rotating column 423, so that the pressing member 424 can move along the axial direction of the rotating column 423 with the rotation of the rotating column 423, and the structure is also made more compact. Specifically, the pressing member 424 is an outer hexagonal nut, and the rotation-stop groove 4221 is an inner hexagonal groove.

[0056] In one embodiment, in combination Figure 5 and Figure 6 As shown, the driving assembly 425 includes a rotating motor 4251, a reduction gear set 4252 and a driven gear 4253. The power output end of the rotating motor 4251 is connected to the reduction gear set 4252, which is used to drive the reduction gear set 4252 to rotate. The reduction gear set 4252 is meshed with the driven gear 4253 for transmission. The driven gear 4253 is sleeved on the rotating column 423, and the driven gear 4253 rotates synchronously with the rotating column 423. Specifically, the cross section of the part where the rotating column 423 and the driven gear 4253 are sleeved is square, and the driven gear 4253 is provided with a square hole. The driven gear 4253 is sleeved on the rotating column 423 through the square hole, so that the driven gear 4253 can rotate synchronously with the rotating column 423.

[0057] In one embodiment, in combination Figure 5 and Figure 6As shown, the rotating column 423 passes through the second limiting member 422 and the first limiting member 421, and passes out to the side of the first limiting member 421 facing away from the second limiting member 422. The locking assembly 42 also includes an axial limiting member 426, which is fixedly sleeved on the rotating column 423 and clamped on the side of the first limiting member 421 facing away from the second limiting member 422. Specifically, the second limiting member 422 and the first limiting member 421 are both provided with a hole for the rotating column 423 to pass through, and the axial limiting member 426 is clamped on the side of the first limiting member 421 facing away from the second limiting member 422, which means that the size of the axial limiting member 426 is larger than the size of the hole of the first limiting member 421, so that the axial limiting member 426 cannot pass through the hole of the first limiting member 421. For the convenience of explanation, it is assumed that the first stopper 421 is located above the second stopper 422. When the rotating column 423 rotates and drives the pressing member 424 to move upward, the pressing member 424 will exert a downward force on the rotating column 423, so that the rotating column 423 has a downward movement tendency. By making the rotating column 423 pass through the side of the first stopper 421 facing away from the second stopper 422, that is, above the first stopper 421, and fixing the axial stopper 426 on the rotating column 423, so that the axial stopper 426 is clamped on the side of the first stopper 421 facing away from the second stopper 422, the rotating column 423 can be prevented from moving downward, thereby realizing the axial positioning of the rotating column 423. Specifically, the axial stopper 426 can be a retaining spring. In order to prevent the retaining spring from wearing the first stopper 421, a gasket 427 can be provided between the retaining spring and the first stopper 421.

[0058] In one embodiment, in combination Figure 4 , Figure 5 and Figure 6As shown, the fixed assembly 41 includes a fixed shell 411 and a cover plate 412, the driving assembly 425 is arranged in the fixed shell 411, the cover plate 412 is arranged on the outside of the fixed shell 411, the cover plate 412 and the fixed shell 411 are enclosed to form a limiting space, the first limiting member 421, the second limiting member 422 and the pressing member 424 are all arranged in the limiting space, the first limiting member 421 is located between the second limiting member 422 and the cover plate 412, the fixed shell 411 is provided with a connecting hole 4113 connected to the limiting space, one end of the rotating column 423 is located in the fixed shell 411 and The cover plate 412 is connected to the driving assembly 425, and the other end of the rotating column 423 passes through the connecting hole 4113 and extends into the limiting space to connect with the pressing member 424; the cover plate 412 partially protrudes from the fixed housing 411, and the portion of the cover plate 412 protruding from the fixed housing 411 is provided with a connecting seat 413, and the connecting seat 413 is provided with a connecting hole 4131. The first rod 31 is provided with one end of the rotating shaft 35 extending between the connecting seat 413 and the limiting space, one end of the rotating shaft 35 is rotatably connected to the connecting hole 4131, and the other end of the rotating shaft 35 extends between the first limiting member 421 and the second limiting member 422. Specifically, the cover plate 412 is detachably connected to the fixed housing 411 to facilitate the disassembly and assembly of the first limiting member 421 and the second limiting member 422, and the cover plate 412 and the fixed housing 411 can be fixed by screws.

[0059] In one embodiment, in combination Figure 4 and Figure 5 As shown, the fixed housing 411 includes a first housing 4111 and a second housing 4112. The first housing 4111 cooperates with the cover plate 412 to form a limited space. The second housing 4112 is arranged on the side of the first housing 4111 facing away from the cover plate 412, and is detachably connected to the first housing 4111. The first housing 4111 and the second housing 4112 are enclosed to form an installation space, and the drive assembly 425 is arranged in the installation space. The first housing 4111 and the second housing 4112 are detachable, which can facilitate the disassembly and assembly of the drive assembly 425. The first housing 4111 and the second housing 4112 can be fixed by screws.

[0060] In one embodiment, in combination Figure 5 and Figure 6 As shown, the locking assembly 42 further includes a plane bearing 428, which is disposed between the second limiting member 422 and the fixed housing 411 and sleeved on the rotating column 423. The plane bearing 428 can support the rotating column 423 and can satisfy the rotation of the rotating column 423 relative to the fixed housing 411. In addition, the plane bearing 428 can also play an axial limiting role on the pressing member 424 disposed in the anti-rotation groove 4221 of the second limiting member 422, so as to prevent the pressing member 424 from falling out of the limiting groove, thereby improving working reliability.

[0061] In one embodiment, Figure 5 As shown, a protrusion is provided on the outer periphery of the rotating column 423, and the driven gear 4253 is sleeved on the protrusion. The locking assembly 42 also includes a first limiting ring 429 and a second limiting ring 430. The first limiting ring 429 and the second limiting ring 430 are both sleeved on the rotating column 423 and are respectively located on opposite sides of the protrusion. One side of the first limiting ring 429 abuts against the first shell 4111, and the other side of the first limiting ring 429 abuts against one side of the driven gear 4253 and one side of the protrusion. One side of the second limiting ring 430 abuts against the second shell 4112, and the other side of the second limiting ring 430 abuts against the other side of the driven gear 4253 and the other side of the protrusion, thereby realizing axial positioning of the driven gear 4253 and the rotating column 423.

[0062] In one embodiment, Figure 3 As shown, the projection screen device further includes a control circuit board 50 and an anti-collision detection mechanism 60. The control circuit board 50 is electrically connected to the retracting mechanism 20 and the anti-collision detection mechanism 60. The anti-collision detection mechanism 60 is used to detect the angle of the rotating shaft 35. The first rod 31 and the second rod 32 will rotate as the screen 10 is unfolded, and the rotation of the first rod 31 will cause the angle of the rotating shaft 35 to change. The anti-collision detection mechanism 60 detects the angle of the rotating shaft 35, so that the motion state of the telescopic mechanism 30 and the screen 10 can be known. In the normal unfolding process of the screen 10, the angle of the rotating shaft 35 increases as the screen 10 is unfolded. When the anti-collision detection mechanism 60 detects that the angle of the rotating shaft 35 is no longer increasing, it is determined that the screen 10 encounters an obstacle. The anti-collision detection mechanism 60 feeds back the detection result to the control circuit board 50, and the control circuit board 50 controls the retracting mechanism 20 to stop unfolding the screen 10, so as to avoid the screen 10 from colliding with the obstacle. In actual operation, when the curtain 10 encounters an obstacle during the unfolding process, the control circuit board 50 can also control the retracting mechanism 20 to rotate in the opposite direction to retract the curtain 10, so that the curtain 10 is away from the obstacle. Specifically, the anti-collision detection mechanism 60 can be a magnetic encoder, which is arranged opposite to the end of the rotating shaft 35, and the magnetic encoder can be fixed on the fixed housing 411 of the fixed component 41 of the locking mechanism 40.

[0063] In one embodiment, the control circuit board 50 is also electrically connected to the locking mechanism 40, and the control circuit board 50 can control the locking mechanism 40 to lock or release the telescopic mechanism 30. When the anti-collision detection mechanism 60 detects that the angle of the rotating shaft 35 is no longer increasing, the control circuit board 50 can control the retracting mechanism 20 to stop unfolding the curtain 10 on the one hand, and can control the locking mechanism 40 to lock the telescopic mechanism 30 on the other hand, so as to fix the curtain 10 and prevent the curtain 10 from colliding with obstacles. In particular, when the telescopic mechanism 30 includes an extension power assembly 33, the tension spring 331 in the extension power assembly 33 can make the first rod 31 and the second rod 32 always have a movement trend of rotating to unfold the curtain 10, so it is necessary to control the locking mechanism 40 to lock the telescopic mechanism 30 to prevent the extension power assembly 33 from driving the curtain 10 to continue to unfold and cause the curtain 10 to collide with obstacles. Specifically, the control circuit board 50 is electrically connected to the driving assembly 425 in the locking assembly 42 in the locking mechanism 40, and can control the start and stop, speed, rotation direction, etc. of the rotating column 423 through the driving assembly 425.

[0064] In one embodiment, the number of anti-collision detection mechanisms 60 is two, and the two anti-collision detection mechanisms 60 are respectively used to detect the angles of the rotating shafts 35 of the two telescopic mechanisms 30. During the normal unfolding of the curtain 10, the angles of the two rotating shafts 35 are increased and remain the same. During the unfolding of the curtain 10, when the two anti-collision detection mechanisms 60 detect that the angles of the two rotating shafts 35 are in any of the following situations, the control circuit board 50 controls the retracting mechanism 20 to stop unfolding the curtain 10, thereby improving the reliability of the anti-collision function: 1. The angles of the two rotating shafts 35 no longer change; 2. The angle of one of the rotating shafts 35 no longer changes, and the angle of the other rotating shaft 35 increases; 3. The angle of one of the rotating shafts 35 no longer changes, and the angle of the other rotating shaft 35 decreases; 4. The angle of one of the rotating shafts 35 increases, and the angle of the other rotating shaft 35 decreases; 5. The angles of the two rotating shafts 35 decrease.

[0065] In one embodiment, Figure 8As shown, the reeling mechanism 20 includes a reel 21, a first driver 22 and a damping sleeve 24. The reel 21 is connected to one end of the curtain 10. The first driver 22 includes a housing 221, a driver body 222 and a power output shaft 223. The driver body 222 is arranged in the housing 221. The driver body 222 is connected to the power output shaft 223 and is used to drive the power output shaft 223 to rotate. The power output shaft 223 is fixedly connected to the reel 21. The damping sleeve 24 is fixedly connected to the housing 221 and is sleeved on the power output shaft 223. During operation, the driver body 222 drives the power output shaft 223 to rotate, and the power output shaft 223 drives the reel 21 to rotate, so that the curtain 10 is unfolded. When the curtain 10 is unfolded to the desired extent, the telescopic mechanism 30 is first locked by the locking mechanism 40 to fix the curtain 10, and then the driver body 222 drives the power output shaft 223 to rotate in the opposite direction, and the power output shaft 223 drives the reel 21 to rotate in the opposite direction to tighten the curtain 10, so that the curtain 10 is flat and wrinkle-free. Then, the driver body 222 can be powered off and stopped to meet the requirements of energy saving and consumption reduction. The friction force of the damping sleeve 24 on the power output shaft 223 is used to prevent the reel 21 from rotating at will, but to maintain a stationary state, so that the curtain 10 can be kept taut and prevent the curtain 10 from shaking. Specifically, the driver body 222 can include a motor and a reduction mechanism, and the motor is connected to the power output shaft 223 through the reduction mechanism. Specifically, the reel 21 is tubular, the first driver 22 can be installed in one end of the reel 21 , and the reeling mechanism 20 further includes a fixed bracket 23 , which is rotatably connected to one end of the reel 21 away from the first driver 22 .

[0066] As an alternative solution, the reeling mechanism 20 may include a reel 21 and a second driver, the reel 21 is connected to one end of the curtain 10, the power output end of the second driver is connected to the reel 21 and is used to drive the reel 21 to rotate, and the second driver includes a brushless iron core motor. By controlling the Hall number of the brushless iron core motor, the degree of unfolding of the curtain 10 can be accurately controlled. The brushless iron core motor has the characteristic of cogging torque, which is also called positioning torque. It always tries to position the rotor at a certain position, so as to achieve a self-locking function. As long as the brushless iron core motor stops running, the reel 21 cannot rotate at will, but maintains a stationary state, thereby stabilizing the position of the curtain 10 and preventing the curtain 10 from shaking. In actual operation, when the curtain 10 is unfolded to the desired extent, the telescopic mechanism 30 is first locked by the locking mechanism 40 to fix the curtain 10, and then the brushless iron core motor of the retracting mechanism 20 drives the reel 21 to rotate in the opposite direction to tighten the curtain 10, so that the curtain 10 is flat and wrinkle-free, and then the brushless iron core motor can be powered off and stopped to meet the needs of energy saving and consumption reduction, and its self-locking function is used to keep the reel 21 in a stationary state, so that the curtain 10 remains tensioned. Specifically, the second driver also includes a planetary gear mechanism, and the brushless iron core motor drives the reel 21 through the planetary gear mechanism, and the planetary gear mechanism plays a role of deceleration and torque increase. Specifically, the reel 21 is tubular, and the second driver can be installed in one end of the reel 21. The retracting mechanism 20 also includes a fixed bracket 23, and the fixed bracket 23 is rotatably connected to the end of the reel 21 away from the first driver 22.

[0067] In one embodiment, in combination Figure 1 and Figure 2 As shown, the projection screen device also includes a storage box 70, the storage box 70 is provided with an opening 71, the retracting mechanism 20 and the locking mechanism 40 are both arranged in the storage box 70, and the screen 10 and the telescopic mechanism 30 can extend out of the storage box 70 through the opening 71 and be stored in the storage box 70. By providing the storage box 70, the retracting mechanism 20, the locking mechanism 40, the screen 10 and the telescopic mechanism 30 are all stored in the storage box 70, which can facilitate the installation and transportation of the projection screen device. Specifically, the control circuit board 50 and the anti-collision detection mechanism 60 are both arranged in the storage box 70, the first driver 22 or the second driver of the retracting mechanism 20 is fixedly connected to the storage box 70, the fixed bracket 23 of the retracting mechanism 20 is fixedly connected to the storage box 70, and the fixed component 41 of the locking mechanism 40 is fixedly connected to the storage box 70. The storage box 70 can be installed at a high place, such as a ceiling, a wall, or a 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, a table, or the like, so that the curtain 10 can be unfolded from bottom to top.

[0068] In one embodiment, in combination Figure 1 and Figure 2As shown, a cover 80 is fixedly provided at one end of the curtain 10 away from the retracting mechanism 20. When the curtain 10 and the retracting mechanism 30 are stored in the storage box 70, the cover 80 covers the opening 71 of the storage box 70, which can improve the aesthetics on the one hand and prevent impurities from entering the storage box 70 on the other hand. Specifically, one end of the second rod 32 away from the first rod 31 is rotatably connected to the cover 80.

[0069] It should be noted that the above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A projection screen device, characterized in that: The invention comprises a curtain, a retracting mechanism, a telescopic mechanism and a locking mechanism. The retracting mechanism is connected to one end of the curtain and is used for retracting and unfolding the curtain. The telescopic mechanism is connected to the curtain and can be extended as the curtain is unfolded and can be retracted as the curtain is retracted. The locking mechanism is used for locking the telescopic mechanism.

2. The projection screen device according to claim 1, characterized in that: The locking mechanism includes a fixing component and a locking component arranged on the fixing component; the telescopic mechanism includes a first rod and a second rod, the two ends of the first rod are respectively rotatably connected to the fixing component and one end of the second rod, the other end of the second rod is rotatably connected to an end of the curtain away from the rolling mechanism, and the locking component is used to lock the first rod to limit the rotation of the first rod relative to the fixing component.

3. The projection screen device according to claim 2, characterized in that: A rotating shaft is fixedly provided at one end of the first rod member away from the second rod member, and the rotating shaft is rotatably connected to the fixing assembly; the locking assembly includes a first limiting member, a second limiting member and a clamping member, and the first limiting member and the second limiting member are respectively arranged on opposite sides of the rotating shaft, and the clamping member can move toward a direction close to the first limiting member to clamp the second limiting member, and move toward a direction away from the first limiting member to loosen the second limiting member.

4. The projection screen device according to claim 3, characterized in that: The locking assembly also includes a rotating column and a driving assembly. The clamping member is threadedly sleeved on the rotating column. The power output end of the driving assembly is connected to the rotating column and is used to drive the rotating column to rotate, thereby driving the clamping member to move linearly in a direction close to or away from the first limiting member.

5. The projection screen device according to claim 2, characterized in that: A rotating shaft is fixedly provided at one end of the first rod away from the second rod, and the rotating shaft is rotatably connected to the fixed component; the projection screen device also includes a control circuit board and an anti-collision detection mechanism, the control circuit board is electrically connected to the retracting mechanism and the anti-collision detection mechanism, and the anti-collision detection mechanism is used to detect the angle of the rotating shaft.

6. The projection screen device according to claim 5, characterized in that: The number of the telescopic mechanisms and the anti-collision detection mechanisms are both two, and the two anti-collision detection mechanisms are respectively used to detect the angles of the rotation shafts of the two telescopic mechanisms.

7. The projection screen device according to claim 2, characterized in that: The telescopic mechanism further includes an extension power assembly, which is connected to the first rod and the second rod, and is used to drive the first rod and the second rod to rotate so as to unfold the curtain.

8. The projection screen device according to claim 7, characterized in that: The first rod and the second rod are rotatably connected via a hinge shaft; the extension power assembly includes a tension spring and a pull rope, one end of the tension spring is fixed to the second rod, the other end of the tension spring is fixed to one end of the pull rope, and the other end of the pull rope is fixed to the first rod after passing through the side of the hinge shaft.

9. The projection screen device according to any one of claims 1 to 8, characterized in that: The reeling 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 casing, a driver body and a power output shaft, the driver body is arranged in the casing, the driver body is connected to the power output shaft and is used to drive the power output shaft to rotate, the power output shaft is fixedly connected to the reel, and the damping sleeve is fixedly connected to the casing and is sleeved on the power output shaft.

10. The projection screen device according to any one of claims 1 to 8, characterized in that: The reeling mechanism includes a reel and a second driver, wherein the reel is connected to one end of the curtain, a power output end of the second driver is connected to the reel and is used to drive the reel to rotate, and the second driver includes a brushless iron core motor.

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