Lifting projection curtain

Abstract

The utility model relates to a lifting projection curtain, comprising a housing, in which at least two supports are arranged; the traction units and the supports are arranged in a one-to-one correspondence mode, each traction unit comprises a traction belt reel rotationally arranged on the corresponding support and a traction belt, one end of each traction belt is connected to the corresponding traction belt reel, and the other end of each traction belt penetrates through the shell to be fixed to an external structure; every two adjacent traction belt reels are connected through the corresponding transmission shaft; the limiting and adjusting units are in one-to-one correspondence with the traction units and are used for limiting and adjusting the traction belts; the limiting adjusting unit comprises an adjusting rod movably arranged on the support and a limiting shaft sleeve rotationally arranged on the adjusting rod in a sleeving mode, and the outer surface of the limiting shaft sleeve is attached to the traction belt. The projection screen provided by the utility model can meet the use requirements of high installation scenes.

Description

TECHNICAL FIELD

[0001] The utility model relates to projection equipment technical field especially relates to a lift projection screen. BACKGROUND

[0002] With the popularity of large screen projection equipment, more and more occasions install projection screen, projection screen can only be effectively installed on the ceiling of suitable height, otherwise the viewer cannot comfortably watch the projection screen, even in some cases, the problem of projection difficulty occurs, therefore if installing the projection screen on the higher ceiling, one way is to process the ceiling, for example erecting pipe frame to reduce the screen installation height, this way has higher construction difficulty and cost, another way is to directly increase the size of the screen or proportionally enlarge the existing projection screen, this way may exceed the load bearing range of parts and components, prone to low service life or failure phenomenon, in addition, in the higher installation scene, the screen installation balance is difficult to adjust, resulting in the screen installation position is inclined after installation. SUMMARY

[0003] In view of the above problems, the utility model aims at providing a lift projection screen to adapt to the use demand of higher installation scene.

[0004] The utility model discloses the purpose that realizes through the following technical scheme:

[0005] Provide a lift projection screen, it includes:

[0006] Shell is equipped with at least two supports in the shell,

[0007] Traction unit, with the support one-to-one corresponding arrangement, the traction unit includes the traction belt reel that rotates setting on the support, and traction belt, one end of the traction belt is connected to the traction belt reel, and the other end is fixed on the external structure through the shell;

[0008] At least one transmission shaft, two adjacent traction belt reels are connected through the transmission shaft,

[0009] Limit adjustment unit, with the traction unit one-to-one corresponding arrangement, for limiting adjustment the traction belt, the limit adjustment unit includes the adjustment rod that can move and set on the support, the limit shaft sleeve that rotates and sets on the adjustment rod, the outer surface of the limit shaft sleeve and the traction belt are close fitting.

[0010] The lifting projection curtain designed in the scheme is installed in a higher scene by designing a traction unit and using a traction belt. Specifically, the traction belt reel is arranged on the bracket, the traction belt is wound on the traction belt reel, one end of the traction belt is fixed to the external structure, the length of the traction belt is adjusted by rotating the traction belt reel, the height of the projection curtain is adjusted, the projection curtain is arranged at a suitable position, and the projection curtain is suitable for installation scenes of different heights. In addition, under the complex installation conditions of the higher scene, small deviations may occur during installation of the projection curtain, or due to external installation environment problems, it is difficult to control the balance of the front and rear positions of the curtain, and after installation, the front and rear positions may be inclined, therefore, a limiting adjustment unit is designed to limit and adjust the traction belt, change the stress position of the traction force of the traction belt, and adjust the center of gravity of the entire projection curtain, change the balance of the front and rear positions of the curtain, and realize the horizontal installation of the curtain.

[0011] Further, the bracket includes a first support arm and a second support arm, the first support arm and the second support arm are respectively provided with opposite sliding holes, and the adjusting rod is arranged in the sliding holes and can move forward and backward.

[0012] The traction belt reel is rotatably arranged between the first support arm and the second support arm, the traction belt is arranged to pass out from between the first support arm and the second support arm, the adjusting rod passes through the two sliding holes to make the limiting shaft sleeve contact the traction belt, the sliding hole is a long circular hole, the position of the adjusting rod is adjusted forward and backward, the limiting shaft sleeve applies a force to the traction belt, and the traction belt is limited.

[0013] Further, the bracket further includes a third support arm arranged vertically opposite to the first support arm and the second support arm, and the limiting adjustment unit further includes a pull rod movably arranged on the third support arm, and one end of the pull rod is connected with the adjusting rod.

[0014] The pull rod is movably arranged on the third support arm, one end of the pull rod is connected with the adjusting rod, the pull rod is adjusted forward and backward to apply a force to the adjusting rod, and the forward and backward positions of the adjusting rod are changed.

[0015] Further, the pull rod includes a transmission arm, a connecting arm rotatably arranged at an end of the transmission arm, and a nut sleeve arranged on the transmission arm, the transmission arm is threadedly connected with the nut, the third support arm is provided with a through hole, the transmission arm passes through the through hole, and the nut is located on a side of the third support arm away from the connecting arm and abuts against the third support arm.

[0016] The nut can be fixed at the position of the through hole or movably arranged, when adjusting, the nut is kept fixed, the transmission arm is screwed to make the transmission arm move forward and backward along the through hole, and the adjusting rod is moved through the connecting arm.

[0017] Further, the connecting arm includes two first connecting parts arranged in parallel and a second connecting part connecting the two first connecting parts. The adjusting rod passes through and connects the two first connecting parts, and the second connecting part is connected to the transmission arm.

[0018] To ensure the force balance of the adjusting rod and a stable process during forward and backward movement, the connecting arm is designed in an "匸" shape. The two first connecting parts are respectively located on both sides of the limiting bushing. The first connecting part is provided with a connecting hole, and the adjusting rod passes through the connecting hole to achieve their transmission connection. The second connecting part is relatively rotatably connected to the transmission arm. By adjusting the transmission arm forward and backward, the adjusting rod is then smoothly moved through the first connecting part and the second connecting part.

[0019] Further, the limiting bushing includes a fitting part and limiting parts located at both ends of the fitting part. The diameter of the end of the limiting part away from the fitting part is greater than the diameter of the fitting part, and the fitting part and the limiting part are arc-transition connected.

[0020] The fitting part of the limiting bushing is fitted with the traction belt. To ensure that the traction belt does not shift left and right during the lifting and lowering process, limiting parts are provided at both ends of the fitting part to limit the traction belt left and right. At the same time, the fitting part and the limiting part are arc-transition connected to reduce the friction between the traction belt and the limiting part and improve the service life.

[0021] Further, the traction unit further includes a bearing member, and the traction belt reel is rotatably arranged on the bracket through the bearing member.

[0022] The reel is rotatably arranged on the bracket through the bearing member to ensure a stable rotation process, reduce the wear during the rotation process, and improve the service life of the components.

[0023] Further, it further includes a first driving member arranged on the bracket, and the first driving member is drivingly connected to one of the traction belt reels.

[0024] The rotation of the traction belt reel can be driven by the first driving member, and the automatic lifting and lowering of the projection screen is achieved by controlling the rotation of the first driving member.

[0025] Further, it further includes a screen lifting and lowering unit. The screen lifting and lowering unit includes a screen reel, a screen that can be wound on the screen reel, and a second driving member that drives the screen reel to rotate. The second driving member is arranged on the bracket.

[0026] The lifting and lowering of the screen also adopts an automatic method. The screen is wound on the screen reel, and the reel is rotated by the second driving member to achieve the automatic lifting and lowering and rolling of the screen.

[0027] Further, a fall-preventing unit is arranged corresponding to the support, one end of the fall-preventing unit is connected to the support, and the other end is connected to an external structure.

[0028] To ensure the safety of the projection screen, the fall-preventing unit is arranged on the support, so that the fall-preventing unit can prevent the device from falling in case of an accident.

[0029] Compared with the prior art, the present application has the following advantages:

[0030] The lifting projection screen is designed to have a traction unit, and the traction belt is used to install the projection screen in a high scene, specifically, the traction belt reel is arranged on the support, the traction belt can be wound on the traction belt reel, one end of the traction belt is fixed to the external structure, the length of the traction belt is adjusted by rotating the traction belt reel, the height of the projection screen is adjusted, the projection screen is arranged in a suitable position, and the projection screen is suitable for installation in different height scenes. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 FIG. 1 is a structural diagram of a lifting projection screen according to an embodiment of the present application.

[0032] Figure 2 FIG. 4 is a structural diagram of the inside of the shell according to an embodiment of the present application.

[0033] Figure 3 FIG. 6 is a structural diagram of the assembly of the support and the traction unit according to an embodiment of the present application.

[0034] Figure 4 FIG. 7 is another perspective view of the structural diagram of the assembly of the support and the traction unit according to an embodiment of the present application.

[0035] Figure 5 FIG. 8 is a structural diagram of the pull rod according to an embodiment of the present application.

[0036] Illustration: 1, shell; 11, support; 111, first support arm; 112, second support arm; 113, third support arm; 14, sliding hole; 15, through hole; 2, traction unit; 21, traction belt reel; 22, traction belt; 23, first driving part; 3, limit adjustment unit; 31, adjustment rod; 32, limit shaft sleeve; 33, pull rod; 321, fitting part; 322, limiting part; 331, transmission arm; 332, connecting arm; 333, nut; 3321, first connecting part; 3322, second connecting part; 4, curtain lifting unit; 41, curtain reel; 42, curtain; 43, second driving part; 5, transmission shaft; 6, anti-falling unit. DETAILED DESCRIPTION

[0037] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be realized in many different forms and is not limited to the embodiments described herein.

[0038] As shown in the drawings, the present embodiment provides a lifting projection curtain, comprising: Figures 1 to 5

[0039] Shell 1, two supports 11 are arranged in the shell 1; two supports 11 are respectively located at the left and right ends of the shell 1. In other possible embodiments, since the projection curtain is large, the size of the shell 1 is long, and therefore the number of supports 11 can be increased.

[0040] Traction unit 2, one-to-one corresponding to the support 11, two traction units 2 are arranged in the present embodiment, the traction unit 2 comprises a traction belt reel 21, a traction belt 22, a bearing member and a first driving part 23. The traction belt reel 21 is rotatably arranged on the support 11 through the bearing member to ensure smooth rotation and reduce wear during rotation, thereby prolonging the service life of the parts. One end of the traction belt 22 is connected to the traction belt reel 21, and the other end is fixed to the external structure through the shell 1. The two traction belt reels 21 are connected by a transmission shaft 5, the first driving part 23 is drivingly connected with one of the traction belt reels 21, and the automatic lifting of the projection curtain is realized by controlling the rotation of the first driving part 23. The first driving part 23 can adopt a tubular motor, the output end of which is connected with the traction belt reel 21, and the transmission shaft 5 is a hollow structure, the body of the motor is arranged in the hollow tube of the transmission shaft 5, and all the traction belt reels 21 are driven to rotate by one first driving part 23, thereby realizing the synchronous winding of all the traction belts 22. Of course, in other possible embodiments, the number of first driving parts 23 can also be set according to the actual situation.

[0041] ​The limiting and adjusting unit 3 is arranged in one-to-one correspondence with the traction unit 2, and is used for limiting and adjusting the traction belt 22; the limiting and adjusting unit 3 comprises an adjusting rod 31 movably arranged on the support 11, and a limiting sleeve 32 rotatably sleeved on the adjusting rod 31, and an outer surface of the limiting sleeve 32 is in abutment with the traction belt 22. The limiting sleeve 32 comprises an abutment portion 321 and limiting portions 322 located at two ends of the abutment portion 321, a diameter of one end of the limiting portion 322 away from the abutment portion 321 is greater than that of the abutment portion 321, and the abutment portion 321 and the limiting portions 322 are circularly and transitionally connected. The abutment portion 321 of the limiting sleeve 32 is in abutment with the traction belt 22, in order to ensure that the traction belt 22 is not deviated left and right in the lifting process, the limiting portions 322 are arranged at two ends of the abutment portion 321 to limit the traction belt 22 left and right, and meanwhile, the abutment portion 321 and the limiting portions 322 are circularly and transitionally connected, so as to reduce the friction between the traction belt 22 and the limiting portions 322 and improve the service life.

[0042] The lifting projection screen of the embodiment is provided with the traction unit 2, and the traction belt 22 is used to install the projection screen in a higher scene, specifically, the traction belt reel 21 is rotatably arranged on the support 11, the traction belt 22 is wound on the traction belt reel 21, one end of the traction belt 22 is fixed on an external structure, the length of the traction belt 22 is adjusted by rotating the traction belt reel 21, the height of the projection screen is adjusted, the projection screen is arranged at a suitable position, and the projection screen is suitable for installation in different height scenes. In addition, under the complex installation conditions of the higher scene, a small deviation is prone to occur in the installation of the projection screen, or due to the external installation environment, the balance of the front and rear positions of the screen is difficult to control, and the phenomenon of front and rear inclination after installation occurs, therefore, the limiting and adjusting unit 2 is designed to limit and adjust the traction belt, change the stress position of the traction force of the traction belt 22, and then adjust the center of gravity of the whole projection screen, change the balance of the front and rear of the screen, and realize the horizontal installation of the screen.

[0043] As Figures 3 to 5As shown, the bracket 11 includes a first support arm 111, a second support arm 112, and a third support arm 113 disposed perpendicular to the first support arm 111 and the second support arm 112. Opposite sliding holes 14 are provided on the first support arm 111 and the second support arm 112 respectively. The adjusting rod 31 is inserted through the sliding holes 14 and can move back and forth. The traction belt reel 21 is rotatably arranged between the first support arm 111 and the second support arm 112. The traction belt 22 passes through between the first support arm 111 and the second support arm 112. The adjusting rod 31 traverses the two sliding holes 14 so that the limiting bushing 32 is in close contact with the traction belt 22. The sliding holes 14 are oblong holes. By adjusting the position of the adjusting rod 31 back and forth, the limiting bushing 32 applies a force to the traction belt 22, thereby limiting the traction belt 22. The limiting adjustment unit 2 further includes a pull rod 33 movably arranged back and forth on the third support arm 113. One end of the pull rod 33 is connected to the adjusting rod 31. By adjusting the pull rod 33 back and forth, a force is applied to the adjusting rod 31, thereby changing the front and back position of the adjusting rod 31. The pull rod 33 includes a transmission arm 331, a connecting arm 332 rotatably arranged at the end of the transmission arm 331, and a nut 333 sleeved on the transmission arm 331. The transmission arm 331 is threadedly connected to the nut 333. The third support arm 113 is provided with a through hole 15. The transmission arm 331 passes through the through hole 15. The nut 333 is located on the side of the third support arm 113背离 the connecting arm 332 and abuts against the third support arm 113. The nut 333 can be fixed at the position of the through hole 15 or can be movably arranged. When adjusting, the nut 333 is kept stationary, and the transmission arm 331 is rotated, so that the transmission arm 331 can move back and forth along the through hole 15, thereby带动 the adjusting rod 31 to move through the connecting arm 332. The connecting arm 332 includes two first connecting portions 3321 arranged in parallel and a second connecting portion 3322 connecting the two first connecting portions 3321. The adjusting rod 31穿设连接 the two first connecting portions 3321, and the second connecting portion 3322 is connected to the transmission arm 331. To ensure the force balance of the adjusting rod 31 and the smoothness of the back and forth movement process, the connecting arm 332 is designed in a "匸" shape. The two first connecting portions 3321 are respectively located on both sides of the limiting bushing 32. The first connecting portion 3321 is provided with a connecting hole. The adjusting rod 31 passes through the connecting hole to实现 the transmission connection between the two; the second connecting portion 3322 is rotatably connected to the transmission arm 331. The transmission arm 331 is adjusted back and forth, thereby带动 the adjusting rod 31 to move smoothly through the first connecting portion 3321 and the second connecting portion 3322.

[0044] As Figure 2 It should be noted that there are some inaccuracies or unclear expressions in the original text, such as "背离" which may need to be further determined according to the context for a more accurate translation. And "穿设连接" is also a rather literal and perhaps not the most common expression, which is translated as accurately as possible here.As shown, the lifting projection curtain further comprises a curtain lifting unit 4, the curtain lifting unit 4 comprises a curtain reel 41, a curtain 42 wound on the curtain reel 41, and a second driving member 43 driving the curtain reel 41 to rotate, and the second driving member 43 is arranged on the support 11. The second driving member 43 can adopt a tubular motor, the output end of which is connected with the curtain reel 4, and the curtain reel 41 is a hollow structure, the body of the motor is arranged in the hollow tube of the curtain reel 41, the curtain reel 41 is driven to rotate by the second driving member 43, and the lifting of the curtain 42 is also in an automatic mode, the curtain 42 is wound on the curtain reel 41, the reel is driven to rotate by the second driving member 43, and the automatic lifting and winding of the curtain 42 is realized. In order to ensure the safety of the projection curtain, a falling prevention unit 6 corresponding to the support 11 is arranged, one end of the falling prevention unit 6 is connected to the support 11, and the other end is connected to an external structure. If an accident occurs, the falling prevention unit 6 plays a role in preventing falling, and danger caused by the falling of the whole device is avoided.

[0045] In the description of the present application, it should be understood that the terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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 particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0046] In addition, the terms "first", "second", and the like are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0047] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, replacements and variations of the embodiments can be made without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A lift projection screen, characterized by, The utility model relates to a curtain lifting device, including: A shell is internally provided with at least two supports; A traction unit is provided in one-to-one correspondence with the support, the traction unit includes a traction belt reel rotatably arranged on the support, and a traction belt, one end of the traction belt is connected to the traction belt reel, and the other end is fixed to an external structure through the shell; At least one transmission shaft is connected between two adjacent traction belt reels through the transmission shaft; A limiting and adjusting unit is provided in one-to-one correspondence with the traction unit for limiting and adjusting the traction belt, the limiting and adjusting unit includes an adjusting rod movably arranged on the support, and a limiting sleeve rotatably arranged on the adjusting rod, the outer surface of the limiting sleeve is in close contact with the traction belt.

2. The lift projection screen according to claim 1, wherein, The support includes a first support arm and a second support arm, the first support arm and the second support arm are respectively provided with opposite sliding holes, the adjusting rod is arranged in the sliding hole and can move forward and backward.

3. The lift projection screen according to claim 2, wherein, The support further includes a third support arm arranged in vertical opposition to the first support arm and the second support arm, and the limiting and adjusting unit further includes a pull rod movably arranged on the third support arm, one end of the pull rod is connected to the adjusting rod.

4. The lift projection screen according to claim 3, wherein, The pull rod includes a transmission arm, a connecting arm rotatably arranged at the end of the transmission arm, and a nut sleeve arranged on the transmission arm, the transmission arm is threadedly connected to the nut sleeve, the third support arm is provided with a through hole, the transmission arm passes through the through hole, and the nut sleeve is located on the side of the third support arm away from the connecting arm and abuts against the third support arm.

5. The lift projection screen according to claim 4, wherein, The connecting arm includes two first connecting parts arranged in parallel, and a second connecting part connecting the two first connecting parts, the adjusting rod passes through the two first connecting parts, and the second connecting part is connected to the transmission arm.

6. The lift projection screen of claim 1, wherein, The limiting sleeve includes a close-fitting part and limiting parts located at both ends of the close-fitting part, the diameter of one end of the limiting part away from the close-fitting part is greater than the diameter of the close-fitting part, and the close-fitting part and the limiting part are connected in arc transition.

7. The lift projection screen of claim 1, wherein, The traction unit further includes a bearing, and the traction belt reel is rotatably arranged on the support through the bearing.

8. The lift projection screen of claim 1, wherein, Further including a first driving member arranged on the support, the first driving member is drivingly connected to one of the traction belt reels.

9. The lift projection screen of claim 1, wherein, Further including a curtain lifting unit, the curtain lifting unit includes a curtain reel, a curtain wound on the curtain reel, and a second driving member driving the curtain reel to rotate, the second driving member is arranged on the support.

10. The lift projection screen of claim 1, wherein, Further including a fall-preventing unit arranged in one-to-one correspondence with the support, one end of the fall-preventing unit is connected to the support, and the other end is connected to an external structure.

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