Projection screen device

Abstract

The application belongs to the technical field of projection equipment, and specifically provides a projection screen device, which comprises a screen, a rolling mechanism, an extension mechanism and a locking mechanism. The rolling mechanism is connected to one end of the screen and is used for rolling up and unrolling the screen. The extension mechanism is connected to the screen and can be stretched along with the unrolling of the screen and can be retracted along with the rolling up of the screen. The locking mechanism is used for locking the extension mechanism. The rolling mechanism is rotated to unroll the screen, the extension mechanism can be stretched along with the unrolling of the screen, when the screen is unrolled to any required degree, the extension mechanism is locked by the locking mechanism to limit the extension and retraction of the extension mechanism, so that the screen can be fixed and stably hovers at the current position. Then, the rolling mechanism can be reversely rotated and resist the extension mechanism in the locked state, so that the screen can be pulled tight, the screen is flat and is not prone to wrinkle and shaking, and the user's viewing experience 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 roller to rotate, thereby unfolding and retracting the projection screen. However, unfolded projection screens are prone to wrinkles and shaking, affecting the user's viewing experience. Summary of the Invention

[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 retraction mechanism, a telescopic mechanism, and a locking mechanism. The retraction 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 unfolds and retract as the screen retracts. The locking mechanism is used to lock the telescopic mechanism.

[0005] Furthermore, the locking mechanism includes a fixing component and a locking component disposed 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 one end of the fixing 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 locking component is used to lock the first rod to restrict the rotation of the first rod relative to the fixing component.

[0006] Furthermore, a rotating shaft is fixedly provided at the end of the first rod away from the second rod, 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 pressing member. The first limiting member and the second limiting member are respectively provided on opposite sides of the rotating shaft. The pressing member can move toward the first limiting member to press the second limiting member, and move away from the first limiting member to release the second limiting member.

[0007] Furthermore, the locking assembly also includes a rotating column and a drive assembly. The clamping member is threaded onto the rotating column, and the power output end of the drive assembly is connected to the rotating column and used to drive the rotating column to rotate, thereby causing the clamping member to move linearly toward or away from the first limiting member.

[0008] Furthermore, a pivot is fixedly installed at the end of the first rod away from the second rod, and the pivot is rotatably connected to the fixing assembly; 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 winding mechanism and the anti-collision detection mechanism, and the anti-collision detection mechanism is used to detect the angle of the pivot.

[0009] Furthermore, there are two telescopic mechanisms and two anti-collision detection mechanisms, with the two anti-collision detection mechanisms used to detect the angle of the rotating shaft of each of the two telescopic mechanisms.

[0010] Furthermore, the telescopic mechanism also includes an extension power assembly connected to the first and second rods, which drives the first and second rods to rotate in order to unfold the curtain.

[0011] Furthermore, the first and second rods are rotatably connected by 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 the side of the hinge shaft.

[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: In use, the retraction mechanism rotates to unfold the screen, and the telescopic mechanism extends along with the unfolded screen. When the screen is unfolded to any desired extent, the locking mechanism locks the telescopic mechanism to restrict its extension and retraction, thereby fixing the screen and keeping it stably suspended in its current position. Subsequently, the retraction mechanism can rotate in the opposite direction to resist the locked telescopic mechanism, thus tightening the screen, making it flat and less prone to wrinkles or shaking, improving the user's viewing experience. When not in use, the locking mechanism releases the telescopic mechanism, and the retraction mechanism rotates to roll up the screen, with the telescopic mechanism retracting along with 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 1A 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 has been hidden.

[0019] Figure 4 for Figure 3 An exploded view of a portion of the projection screen device shown.

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

[0021] Figure 6 for Figure 4 An exploded view of a portion 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 roll-up mechanism of the projection screen device shown.

[0024] The following are the labeling elements in the figure:

[0025] 10. Curtain;

[0026] 20. Rewinding mechanism; 21. Reel; 22. First driver; 221. Housing; 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 component; 411. Fixing housing; 4111. First housing; 4112. Second housing; 4113. Communicating hole; 412. Cover plate; 413. Connecting seat; 4131. Connecting hole; 42. Locking component; 421. First limiting member; 422. Second limiting member; 4221. Anti-rotation groove; 423. Rotating column; 424. Clamping member; 425. Drive component; 4251. Rotary motor; 4252. Reduction gear set; 4253. Driven gear; 426. Axial limiting member; 427. Shim; 428. Surface bearing; 429. First limiting ring; 430. Second limiting ring;

[0029] 50. Control circuit board;

[0030] 60. Collision avoidance testing agencies;

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

[0032] 80. Cover. Detailed Implementation

[0033] 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.

[0034] 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, and 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, and therefore should not be construed as a limitation of this application.

[0035] 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.

[0036] 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.

[0037] Combination Figure 1 , Figure 2 and Figure 3 As shown, this application provides a projection screen device, including a screen 10, a retraction mechanism 20, a telescopic mechanism 30, and a locking 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 can extend as the screen 10 unfolds and retract as the screen 10 retracts. The locking mechanism 40 is used to lock the telescopic mechanism 30.

[0038] In use, the retraction mechanism 20 is rotated to unfold the screen 10, and the telescopic mechanism 30 extends as the screen 10 unfolds. When the screen 10 is unfolded to any desired extent, the telescopic mechanism 30 is locked by the locking mechanism 40 to restrict its extension and retraction, thereby fixing the screen 10 and keeping it stably suspended in the current position. Subsequently, the retraction mechanism 20 can be rotated 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, thus improving the user's viewing experience. When not in use, the locking mechanism 40 is released to release the telescopic mechanism 30, and the retraction mechanism 20 rotates to retract the screen 10, with the telescopic mechanism 30 retracting as the screen 10 is retracted.

[0039] 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.

[0040] 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.

[0041] In one embodiment, combined Figure 3 and Figure 4 As shown, the locking mechanism 40 includes a fixing component 41 and a locking component 42 disposed on the fixing 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 fixing component 41 and one end of the second rod 32, respectively. 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 locking component 42 is used to lock the first rod 31 to restrict the rotation of the first rod 31 relative to the fixing component 41.

[0042] 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 retraction mechanism 20 rotates to unfold the curtain 10, and the end of the curtain 10 away from the retraction mechanism 20 descends. During this process, the second rod 32 rotates relative to the curtain 10, while the first rod 31 rotates relative to the second rod 32 and the fixing component 41 of the locking mechanism 40. The 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 the effect of the telescopic mechanism 30 being stretched in the height direction. When the end of the curtain 10 away from the retraction mechanism descends to any desired height, the locking component 42 of the locking mechanism 40 locks the first rod 31 to restrict 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, it can also restrict the rotation of the second rod 32, thereby fixing the curtain 10 and making the curtain 10 stably suspended at the current position. Then, the retraction mechanism 20 rotates in the opposite direction to resist the telescopic mechanism 30 in the locked state, thereby lifting and tightening the curtain 10. When not in use, the locking assembly 42 releases the telescopic mechanism 30, allowing the first and second rods 31 and 32 to return to their rotatable state. The retraction mechanism 20 then retracts the curtain 10, causing the end of the curtain 10 furthest from the retraction mechanism 20 to rise. During this process, the second rod 32 rotates relative to the curtain 10, while the first rod 31 rotates relative to the second rod 32 and the fixing assembly 41. The angle between the first and second rods 31 narrows, creating the effect of the telescopic mechanism 30 retracting in the height direction. After the curtain 10 is fully retracted, the first and second rods 31 fold, resulting in a small overall size for easy storage.

[0043] In one embodiment, such as Figure 1As shown, there are two telescopic mechanisms 30, which are spaced apart along the width of the curtain 10. By arranging two telescopic mechanisms 30 along the width 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, and the stability of the curtain 10 can be improved when displaying and rolling up.

[0044] In one embodiment, such as Figure 7 As shown, the telescopic mechanism 30 also 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 to unfold the curtain 10. When the curtain 10 and the telescopic mechanism 30 are relatively light, it is difficult to ensure that the curtain 10 can fall smoothly and stably by simply rotating the retraction 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 drives the first rod 31 and the second rod 32 to rotate so that the curtain 10 unfolds from top to bottom, providing power for the curtain 10 to fall, thereby ensuring that the curtain 10 falls smoothly and stably. In addition, the extension power assembly 33 can also make the unfolded curtain 10 more taut, making the curtain 10 flatter and less prone to wrinkles and shaking. Of course, when the projection screen device is placed at a low position, such as on the ground or a table, 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 unfolds from bottom to top. Both telescopic mechanisms 30 include extension power assemblies 33, and the two extension power assemblies 33 can provide the same driving force to the first rod 31 and the second rod 32 connected to them, thereby ensuring that the screen 10 can always move in a straight line along its own vertical center line during unfolding and retracting without easily swaying left and right.

[0045] In one embodiment, such as Figure 7 As shown, the first rod 31 and the second rod 32 are rotatably connected by 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, and the other end of the tension spring 331 is fixed to one end of the pull rope 332. 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 unfolding and retraction of the curtain 10, the tension spring 331 remains 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 always have a tendency to rotate to unfold the curtain 10. Taking the unfolding direction of the curtain 10 as downward as an example, the cooperation of the hinge shaft 34, the tension spring 331, and the pull rope 332 ensures that the first rod 31 and the second rod 32 always have a tendency to extend downward, that is, the angle formed between the first rod 31 and the second rod 32 always tends 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, realizing the automatic extension of the telescopic mechanism 30 and providing power for the curtain 10 to fall. When retracting the curtain 10, the elasticity of the tension spring 331 needs to be overcome to fold the first rod 31 and the second rod 32. In other embodiments, the extension power component 33 can also be a compression spring, with its two ends connected to the first rod 31 and the second rod 32 respectively. The compression spring is always in a compressed state, causing the first rod 31 and the second rod 32 to always have a tendency to rotate in order to unfold the curtain 10. The extension power component 33 can also be a torsion spring, with its two ends connected to the first rod 31 and the second rod 32 respectively. The torsion spring always stores angular energy, causing the first rod 31 and the second rod 32 to always have a tendency to rotate in order to unfold the curtain 10.

[0047] Specifically, both the first rod 31 and the second rod 32 are provided with cavities. The tension spring 331 is disposed in the cavity of the first rod 31. One end of the pull rope 332 is located in the cavity of the first rod 31 and connected to the tension spring 331. The other end of the pull rope 332 is fixed in the cavity of the second rod 32. This can prevent the tension spring 331 and the pull rope 332 from being exposed. It not only plays a role in storing and protecting the tension spring 331 and the pull rope 332, but also improves the aesthetics of the projection screen device.

[0048] In one embodiment, combined Figure 4 and Figure 5 As shown, a rotating shaft 35 is fixedly provided at one end of the first rod 31, and the rotating shaft 35 is rotatably connected to the fixing 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 pressing member 424. The first limiting member 421 and the second limiting member 422 are respectively provided on opposite sides of the rotating shaft 35, and the pressing member 424 is provided on the side of the second limiting member 422 facing away from the rotating shaft 35. The pressing member 424 can move towards the first limiting member 421 to press the second limiting member 422, and move away from the first limiting member 421 to relax the second limiting member 422.

[0049] In use, when the curtain 10 is unfolded to any desired extent, the clamping member 424 moves toward the first limiting member 421 to clamp the second limiting member 422. The second limiting member 422 cooperates with the first limiting member 421 to lock the rotating shaft 35, thereby restricting the rotation of the first rod 31 relative to the fixed assembly 41. It can be understood that the first rod 31 and the second rod 32 are linked. When the first rod 31 is restricted from rotating, the second rod 32 is also restricted from rotating. That is, the locking assembly 42 can simultaneously restrict the rotation of the first rod 31 and the second rod 32 by clamping the rotating shaft 35, without having to lock the first rod 31 and the second rod 32 separately, thereby simplifying the device structure and reducing production costs. When not in use, the clamping member 424 is moved away from the first limiting member 421 to relax the second limiting member 422. The second limiting member 422 thus relaxes the pivot 35, and the first rod 31 and the second rod 32 return to a rotatable state. The winding mechanism 20 rotates to wind up the curtain 10. The first rod 31 and the second rod 32 rotate as the curtain 10 winds up. When the curtain 10 is finished winding up, the first rod 31 and the second rod 32 are folded.

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

[0051] Specifically, the first limiting member 421 and the second limiting member 422, in their initial positions, gently contact the outer surface of the rotating shaft 35. This not only does not restrict the rotation of the rotating shaft 35, but also provides support, making the rotation of the rotating shaft 35 more stable. When the clamping member 424 presses the second limiting member 422, it increases the friction between the second limiting member 422 and the rotating shaft 35, thereby restricting the rotation of the rotating shaft 35.

[0052] Specifically, there are two locking mechanisms 40. The first rods 31 of the two telescopic mechanisms 30 are 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 used to lock the rotating shafts 35 of the two telescopic mechanisms 30. By simultaneously locking the rotating shafts 35 of the two telescopic mechanisms 30, the structure of the telescopic mechanism 30 can be made more stable and less prone to deformation, thereby enhancing the support and fixing effect on the curtain 10.

[0053] In one embodiment, such as Figure 5 As shown, the locking assembly 42 also includes a rotating column 423 and a driving assembly 425. The clamping member 424 is threaded onto 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 causing the clamping member 424 to move linearly toward or away from the first limiting member 421.

[0054] When locking the rotating shaft 35 is required, the drive assembly 425 drives the rotating column 423 to rotate. The threaded engagement between the rotating column 423 and the clamping member 424 causes the clamping member 424 to move linearly along the axial direction of the rotating column 423 and toward the first limiting member 421, thereby clamping the second limiting member 422 and locking the rotating shaft 35. When releasing the rotating shaft 35 is required, the drive assembly 425 drives the rotating column 423 to rotate in the opposite direction, and the clamping member 424 moves linearly away from the first limiting member 421 to release the second limiting member 422 and the rotating shaft 35. The operation is simple and convenient. The threaded engagement between the rotating column 423 and the clamping member 424 enables a self-locking function. That is, when the drive assembly 425 stops driving the rotating column 423, the clamping member 424 cannot move arbitrarily but remains stationary, thus maintaining the clamping of the second limiting member 422. Specifically, the clamping component 424 is a nut, and the rotating column 423 is a single-ended lead screw, that is, the lead screw has only a single helical groove.

[0055] In one embodiment, combined Figure 5 and Figure 6 As shown, the second limiting member 422 has an anti-rotation groove 4221 on the side opposite to the first limiting member 421, and the clamping member 424 is disposed in the anti-rotation groove 4221. The anti-rotation groove 4221 can restrict the rotation of the clamping member 424. By opening the anti-rotation groove 4221 on the side of the second limiting member 422 opposite to the first limiting member 421 and disposing of the clamping member 424 in the anti-rotation groove 4221, the clamping member 424 can be prevented from rotating with the rotation of the rotating column 423, thereby realizing that the clamping member 424 moves along the axial direction of the rotating column 423 with the rotation of the rotating column 423, and also making the structure more compact. Specifically, the clamping member 424 is an external hexagonal nut, and the anti-rotation groove 4221 is an internal hexagonal groove.

[0056] In one embodiment, combined Figure 5 and Figure 6 As shown, the drive assembly 425 includes a rotary motor 4251, a reduction gear set 4252, and a driven gear 4253. The power output end of the rotary motor 4251 is connected to the reduction gear set 4252 to drive the reduction gear set 4252 to rotate. The reduction gear set 4252 meshes 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. The driven gear 4253 has a square hole, and the driven gear 4253 is sleeved on the rotating column 423 through the square hole, thereby enabling the driven gear 4253 to rotate synchronously with the rotating column 423.

[0057] In one embodiment, combined Figure 5 and Figure 6As shown, the rotating column 423 passes through the second limiting member 422 and the first limiting member 421, and extends to the side of the first limiting member 421 opposite to 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 engaged on the side of the first limiting member 421 opposite to the second limiting member 422. Specifically, both the second limiting member 422 and the first limiting member 421 have holes for the rotating column 423 to pass through. The axial limiting member 426 being engaged on the side of the first limiting member 421 opposite to the second limiting member 422 means that the size of the axial limiting member 426 is larger than the size of the hole in the first limiting member 421, so that the axial limiting member 426 cannot pass through the hole in the first limiting member 421. For ease of explanation, assume the first limiting member 421 is located above the second limiting member 422. When the rotating column 423 rotates, causing the clamping member 424 to move upward, the clamping member 424 applies a downward force to the rotating column 423, causing the rotating column 423 to tend to move downward. By extending the rotating column 423 to the side of the first limiting member 421 opposite to the second limiting member 422 (i.e., above the first limiting member 421), and fixing an axial limiting member 426 on the rotating column 423, the axial limiting member 426 is engaged with the side of the first limiting member 421 opposite to the second limiting member 422, thus preventing the rotating column 423 from moving downward and achieving axial positioning of the rotating column 423. Specifically, the axial limiting member 426 can be a retaining spring. To prevent the retaining spring from wearing down the first limiting member 421, a washer 427 can be placed between the retaining spring and the first limiting member 421.

[0058] In one embodiment, combined Figure 4 , Figure 5 and Figure 6As shown, the fixing assembly 41 includes a fixing housing 411 and a cover plate 412. The driving assembly 425 is disposed inside the fixing housing 411, and the cover plate 412 is disposed outside the fixing housing 411. The cover plate 412 and the fixing housing 411 enclose a limiting space. The first limiting member 421, the second limiting member 422, and the clamping member 424 are all disposed within the limiting space. The first limiting member 421 is located between the second limiting member 422 and the cover plate 412. The fixing housing 411 is provided with a communicating hole 4113 communicating with the limiting space. One end of the rotating column 423 is located inside the fixing housing 411 and... Connected to the drive assembly 425, the other end of the rotating column 423 passes through the connecting hole 4113 and extends into the limiting space to connect with the clamping member 424; the cover plate 412 partially protrudes from the fixed housing 411, and a connecting seat 413 is provided at the part of the cover plate 412 protruding from the fixed housing 411. The connecting seat 413 has a connecting hole 4131. One end of the first rod 31 with a rotating shaft 35 extends 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 and the fixed housing 411 are detachably connected to facilitate the assembly and disassembly of the first limiting member 421 and the second limiting member 422. The cover plate 412 and the fixed housing 411 can be fixed with screws.

[0059] In one embodiment, combined 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 limiting space. The second housing 4112 is disposed 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 enclose an installation space, and the drive assembly 425 is disposed within the installation space. The first housing 4111 and the second housing 4112 are detachable, which facilitates the assembly and disassembly of the drive assembly 425. The first housing 4111 and the second housing 4112 can be fixed with screws.

[0060] In one embodiment, combined Figure 5 and Figure 6 As shown, the locking assembly 42 also includes a planar bearing 428, which is disposed between the second limiting member 422 and the fixed housing 411, and sleeved on the rotating column 423. The planar bearing 428 can support the rotating column 423 and allow the rotating column 423 to rotate relative to the fixed housing 411. In addition, the planar bearing 428 can also axially limit the clamping member 424 disposed in the anti-rotation groove 4221 of the second limiting member 422, preventing the clamping member 424 from falling out of the limiting groove and improving operational reliability.

[0061] In one embodiment, such as 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 located on opposite sides of the protrusion. One side of the first limiting ring 429 abuts against the first housing 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 housing 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 enabling axial positioning of the driven gear 4253 and the rotating column 423.

[0062] In one embodiment, such as Figure 3 As shown, the projection screen device also includes a control circuit board 50 and an anti-collision detection mechanism 60. The control circuit board 50 is electrically connected to the retraction mechanism 20 and the anti-collision detection mechanism 60, which is used to detect the angle of the pivot 35. The first rod 31 and the second rod 32 rotate as the screen 10 unfolds. The rotation of the first rod 31 causes a change in the angle of the pivot 35. By detecting the angle of the pivot 35 through the anti-collision detection mechanism 60, the movement state of the telescopic mechanism 30 and the screen 10 can be determined. During the normal unfolding of the screen 10, the angle of the pivot 35 increases as the screen 10 unfolds. When the anti-collision detection mechanism 60 detects that the angle of the pivot 35 no longer increases, it determines that the screen 10 has encountered an obstacle. The anti-collision detection mechanism 60 feeds back the detection result to the control circuit board 50, which then controls the retraction mechanism 20 to stop unfolding the screen 10, thereby preventing the screen 10 from colliding with the obstacle. In actual operation, when the curtain 10 encounters an obstacle during its unfolding process, the control circuit board 50 can also control the rewinding mechanism 20 to rotate in the opposite direction to rewind 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 set at the end opposite to the rotating shaft 35. The magnetic encoder can be fixed on the fixing housing 411 of the fixing 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. 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 no longer increases, the control circuit board 50 can control the rewinding mechanism 20 to stop unfolding the curtain 10, and on the other hand, control the locking mechanism 40 to lock the telescopic mechanism 30, thereby fixing the curtain 10 and preventing the curtain 10 from colliding with obstacles. Especially when the telescopic mechanism 30 includes an extension power assembly 33, the tension spring 331 in the extension power assembly 33 can ensure that the first rod 31 and the second rod 32 always have a tendency to rotate to unfold the curtain 10. Therefore, 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 unfolding and causing the curtain 10 to collide with obstacles. Specifically, the control circuit board 50 is electrically connected to the drive assembly 425 in the locking assembly 42 of the locking mechanism 40, and can control the start / stop, speed, and direction of rotation of the rotating column 423 through the drive assembly 425.

[0064] In one embodiment, there are two anti-collision detection mechanisms 60, which are used to detect the angles of the pivots 35 of the two telescopic mechanisms 30. During the normal unfolding of the curtain 10, the angles of both pivots 35 increase and remain the same. During the unfolding of the curtain 10, when the two anti-collision detection mechanisms 60 detect any of the following situations in the angles of the two pivots 35, the control circuit board 50 controls the rewinding mechanism 20 to stop unfolding the curtain 10, thereby improving the reliability of the anti-collision function: 1. The angles of both pivots 35 no longer change; 2. The angle of one pivot 35 no longer changes, while the angle of the other pivot 35 increases; 3. The angle of one pivot 35 no longer changes, while the angle of the other pivot 35 decreases; 4. The angle of one pivot 35 increases, while the angle of the other pivot 35 decreases; 5. The angles of both pivots 35 decrease.

[0065] In one embodiment, such as Figure 8As shown, the winding 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 disposed inside 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, which in turn drives the roller 21 to rotate, thus unfolding the screen 10. When the screen 10 is unfolded to the desired extent, the telescopic mechanism 30 is first locked by the locking mechanism 40 to fix the screen 10. Then, the driver body 222 drives the power output shaft 223 to rotate in the opposite direction, which in turn drives the roller 21 to rotate in the opposite direction to tighten the screen 10, making it flat and wrinkle-free. Subsequently, the driver body 222 can be powered off to stop operation, in order to meet the requirements of energy saving and consumption reduction. The friction force of the damping sleeve 24 acting on the power output shaft 223 prevents the roller 21 from rotating arbitrarily, keeping it stationary, thereby keeping the screen 10 taut and preventing it from shaking. Specifically, the driver body 222 may include a motor and a reduction mechanism, with the motor connected to the power output shaft 223 through the reduction mechanism. Specifically, the spool 21 is tubular, the first driver 22 can be installed inside one end of the spool 21, and the winding mechanism 20 also includes a fixed bracket 23, which is rotatably connected to the end of the spool 21 away from the first driver 22.

[0066] As an alternative, the winding mechanism 20 may include a roller 21 and a second driver. The roller 21 is connected to one end of the screen 10, and the power output end of the second driver is connected to the roller 21 and used to drive the roller 21 to rotate. The second driver includes a brushless iron core motor. By controlling the Hall effect value of the brushless iron core motor, the degree of unfolding of the screen 10 can be precisely controlled. 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 roller 21 cannot rotate arbitrarily, but remains stationary, thereby 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 locking mechanism 40 to fix the curtain 10. Then, the brushless iron core motor of the winding mechanism 20 drives the roller 21 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 21 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 21 through the planetary gear mechanism, which plays the role of speed reduction and torque increase. Specifically, the roller 21 is tubular, and the second driver can be installed in one end of the roller 21. The winding mechanism 20 also includes a fixed bracket 23, which is rotatably connected to the end of the roller 21 away from the first driver 22.

[0067] In one embodiment, combined Figure 1 and Figure 2 As shown, the projection screen device also includes a storage box 70 with an opening 71. The winding mechanism 20 and locking mechanism 40 are both housed within the storage box 70. The screen 10 and telescopic mechanism 30 can extend out of and retract into the storage box 70 through the opening 71. By providing the storage box 70, the winding mechanism 20, locking mechanism 40, screen 10, and telescopic mechanism 30 are all housed within it, facilitating the installation and transport of the projection screen device. Specifically, the control circuit board 50 and anti-collision detection mechanism 60 are both housed within the storage box 70. The first driver 22 or the second driver of the winding mechanism 20 is fixedly connected to the storage box 70, the fixing bracket 23 of the winding mechanism 20 is fixedly connected to the storage box 70, and the fixing 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 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.

[0068] In one embodiment, combined Figure 1 and Figure 2As shown, a cover 80 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 70, the cover 80 covers the opening 71 of the storage box 70, which improves the aesthetics and prevents impurities from entering the storage box 70. Specifically, the 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 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 by The projection curtain device comprises a curtain, a winding mechanism, an extension mechanism and a locking mechanism, the winding mechanism is connected to one end of the curtain and is used for winding and unfolding the curtain, the extension mechanism is connected to the curtain and can be stretched with the unfolding of the curtain and can be shrunk with the winding of the curtain, and the locking mechanism is used for locking the extension mechanism; the locking mechanism comprises a fixed component and a locking component arranged on the fixed component; the extension mechanism comprises a first rod and a second rod, two ends of the first rod are respectively rotationally connected with the fixed component and one end of the second rod, the other end of the second rod is rotationally connected with one end of the curtain away from the winding mechanism, and the locking component is used for locking the first rod to limit the rotation of the first rod relative to the fixed component; one end of the first rod away from the second rod is fixedly provided with a rotating shaft, and the rotating shaft is rotationally connected with the fixed component; the locking component comprises a first limiting piece, a second limiting piece and a pressing piece, the first limiting piece and the second limiting piece are respectively arranged on opposite sides of the rotating shaft, the pressing piece can move towards the first limiting piece to press the second limiting piece so as to make the second limiting piece cooperate with the first limiting piece to lock the rotating shaft, and the pressing piece can move away from the first limiting piece to release the second limiting piece so as to release the rotating shaft.

2. The projection screen apparatus of claim 1, wherein: The locking component further comprises a rotating column and a driving component, the pressing piece is threadedly sleeved on the rotating column, and the power output end of the driving component is connected to the rotating column and is used for driving the rotating column to rotate, so as to drive the pressing piece to move linearly towards or away from the first limiting piece.

3. The projection screen apparatus of claim 1, wherein: The projection curtain device further comprises a control circuit board and a collision detection mechanism, the control circuit board is electrically connected to the winding mechanism and the collision detection mechanism, and the collision detection mechanism is used for detecting the angle of the rotating shaft.

4. The projection screen apparatus of claim 3, wherein: The number of the extension mechanisms and the number of the collision detection mechanisms are both two, and the two collision detection mechanisms are respectively used for detecting the angle of the rotating shaft of the two extension mechanisms.

5. The projection screen apparatus of claim 1, wherein: The extension mechanism further comprises an extension power component, the extension power component is connected to the first rod and the second rod, and the extension power component is used for driving the first rod and the second rod to rotate to unfold the curtain.

6. The projection screen device of claim 5, wherein: The first rod and the second rod are rotationally connected through a hinged shaft; the extension power component comprises 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 surface of the hinged shaft.

7. The projection screen device according to any one of claims 1-6, wherein: The winding mechanism comprises a winding shaft, a first driver and a damping sleeve, the winding shaft is connected to one end of the curtain, the first driver comprises 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 for driving the power output shaft to rotate, the power output shaft is fixedly connected with the winding shaft, and the damping sleeve is fixedly connected with the casing and is sleeved on the power output shaft.

8. The projection screen device of any of claims 1-6, wherein: The winding mechanism comprises a winding shaft and a second driver, the winding shaft is connected to one end of the curtain, a power output end of the second driver is connected to the winding shaft and is used for driving the winding shaft to rotate, and the second driver comprises a brushless core motor.

Images