A rotatable screen

Abstract

The application relates to the technical field of screens, in particular to a rotatable screen which comprises a mounting frame, a rotating rod rotating on the mounting frame and a display screen fixed on the outer wall of the rotating rod, driving teeth are rotationally connected to the mounting frame, a plurality of driving teeth are rotationally connected to the mounting frame, the driving teeth are coaxially fixed with the rotating rod, the driving tooth gears are all in mesh with the driving teeth, a plurality of driving elements for driving the driving teeth to rotate are arranged on the mounting frame, and the driving elements are in one-to-one correspondence with the driving teeth. The application has the effect that the screen can be normally driven to rotate when the driving motor malfunctions.

Description

Technical Field

[0001] This application relates to the field of screen technology, and in particular to a rotatable screen. Background Technology

[0002] With the booming development of the large multimedia display industry, traditional outdoor advertising is shifting towards large displays in the advertising sector. Currently, large displays are widely used in various fields such as global transportation, banking, finance, and large shopping malls, and are highly favored by corporate users. However, large multimedia displays need continuous product innovation to adapt to the development and changes in the future multimedia information broadcasting display market, and to meet the diverse needs of customers in different industries with a rich product portfolio and professional, comprehensive integrated solutions. In large studios, the varying brightness levels at different locations throughout the day can cause glare when external light shines on the screen, affecting its brightness.

[0003] Existing rotatable screens include a mounting frame, a rotating rod that rotates on the mounting frame, and a display screen fixed on the rotating rod. A drive motor drives the rotating rod to rotate, which in turn drives the display screen to rotate, allowing the display screen to turn in different directions, making it convenient for people to watch the performance from different positions in the studio.

[0004] When the drive motor of the aforementioned rotatable screen malfunctions, it affects the rotation of the rotating rod, thereby disrupting the normal performance. This issue warrants improvement. Summary of the Invention

[0005] In order to reduce the interference caused by the failure of the drive motor to the rotation of the screen and to make the screen rotation easier, this application provides a rotatable screen.

[0006] This application provides a rotatable screen, which adopts the following technical solution: A rotatable screen includes a mounting frame, a rotating rod rotating on the mounting frame, and a display screen fixed to the outer wall of the rotating rod. The mounting frame is rotatably connected to a drive gear, and the mounting frame is rotatably connected to a plurality of drive teeth. The drive teeth are coaxially fixed with the rotating rod, and the drive gears mesh with the drive teeth. The mounting frame is provided with a plurality of drive components for driving the drive teeth to rotate, and the drive components are arranged in a one-to-one correspondence with the drive teeth.

[0007] By adopting the above technical solution, staff can activate one of the drive components. This drive component rotates the drive gear, which meshes with the rotating gear. The rotating gear then drives the rotating rod, which in turn rotates the screen, facilitating screen orientation adjustment and providing convenience for viewers. If one drive component malfunctions, staff can activate another drive component, which in turn drives the corresponding drive gear to rotate, thus rotating the screen and avoiding the possibility of interference with screen rotation due to a single drive component failure.

[0008] Optionally, a mounting plate is fixed on the mounting bracket. The driving gear, the driving tooth, and the driving component are all disposed on the side wall of the mounting plate. A bracket is slidably connected to the mounting plate. A worm gear is rotatably connected to the bracket. A first worm and a second worm are rotatably connected to the bracket. A sliding sleeve is slidably connected to the outer wall of the rotating rod. The display screen is fixedly connected to the outer wall of the sliding sleeve. The worm gear can slide along the length direction of the bracket. The worm gear drives the sliding sleeve to slide. The driving component is correspondingly disposed with the first worm and the second worm. The driving component can drive the first worm to rotate and the driving component can drive the second worm to rotate. Both the first worm and the second worm mesh with the worm gear.

[0009] By adopting the above technical solution, when the two driving components simultaneously drive the corresponding first worm and second worm to rotate in opposite directions, the worm wheel is driven to slide along the length direction of the first worm. The worm wheel drives the sliding sleeve to slide, and the sliding sleeve drives the display screen to move, thereby adjusting the height of the display screen. When the driving components drive the first worm and second worm to rotate in opposite directions, the first worm meshes with the worm wheel, and the second worm meshes with the worm wheel, causing the worm wheel to rotate, which in turn drives the bracket to rotate, thereby driving the display screen to rotate.

[0010] Optionally, the bracket is slidably connected with several connecting rods, which are arranged in a one-to-one correspondence with the driving teeth. The end of each connecting rod is provided with a snap-fit ​​ball, and the end of the first worm gear is fixed with a receiving block. The side wall of the receiving block is provided with an insertion hole, and the inner wall of the insertion hole is provided with a first limiting hole. The snap-fit ​​ball can be inserted into the first limiting hole. The side wall of the driving tooth is provided with a through hole, and the inner wall of the driving tooth is provided with a second limiting hole. The snap-fit ​​ball can be inserted into the second limiting hole.

[0011] By adopting the above technical solution, the rotating shaft of the driving component slides, driving the connecting rod to move. The end of the connecting rod is inserted into the insertion hole. When the driving component drives the connecting rod to rotate, the locking ball is locked in the corresponding first limiting hole. The locking ball restricts the relative rotation between the connecting rod and the receiving block, thereby facilitating the rotation of the first worm and the second worm. When it is necessary to drive the rotating rod to rotate alone, the rotating shaft of the driving component retracts, the connecting rod disengages from the receiving block, and the locking ball is locked in the second limiting hole. When the driving component is running, it drives the driving gear to rotate.

[0012] Optionally, the mounting frame is provided with a telescopic rod, the end of which is rotatably connected to a turntable, a support frame is provided on the turntable, the display screen is fixed on the support frame, and a drive assembly for driving the telescopic rod to extend and retract is provided on the mounting frame.

[0013] By adopting the above technical solution, the drive component is activated, which drives the telescopic rod to extend and retract, causing the support frame to move in the vertical direction, thereby changing the height of the display screen and making it easier to support the display screen at different heights.

[0014] Optionally, the drive assembly includes a drive rod slidably connected to the mounting bracket, a rack slidably on the mounting bracket, and an active tooth rotating on the mounting bracket. The outer wall of the drive rod is provided with a plurality of grooves evenly spaced apart. The active tooth engages with the grooves and engages with the rack. The mounting bracket is provided with a power component for driving the rack to slide.

[0015] By adopting the above technical solution, the power component is activated, which drives the rack to slide, the rack to rotate the drive gear, the drive gear to slide, and the telescopic rod to extend and retract, thereby adjusting the height of the display screen.

[0016] Optionally, the end of the telescopic rod is provided with a snap-fit ​​groove, and a limit ring is fixed on the outer wall of the turntable, the limit ring being rotatably connected to the snap-fit ​​groove.

[0017] By adopting the above technical solution, the limiting ring is inserted and fixed to the snap-fit ​​groove. Under the restriction of the snap-fit ​​groove and the limiting ring, the telescopic ring is connected to the support frame. The turntable can rotate on the telescopic rod and can also drive the telescopic rod to extend and retract, thus making it easier to adjust the tilt angle of the display screen and its height from the ground.

[0018] Optionally, a sliding groove is provided on the side wall of the mounting bracket, and a housing is slidably connected to the mounting bracket. The driving tooth, the driving tooth, and the driving component are all located in the housing, and the end of the rotating rod away from the driving tooth can slide with the mounting bracket.

[0019] By adopting the above technical solution, staff can manually push the display screen to make the rotating rod slide on the mounting frame, allowing the display screen to slide to different positions on the mounting frame.

[0020] Optionally, a sliding block is slidably connected to the mounting bracket, the sliding block is slidably connected to the sliding groove, the end of the rotating rod away from the driving tooth is rotatably connected to the sliding block, and rollers are installed on both the sliding block and the side wall of the box, the rollers rolling in the sliding groove.

[0021] By adopting the above technical solution, the sliding block slides on the mounting frame, driving the rotating rod to slide. During the sliding process of the sliding block and the housing, the roller slides in the sliding groove, reducing the friction between the sliding block and the mounting frame, and reducing the friction between the housing and the mounting frame, making it easier to drive the display screen to slide.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. When one of the drive components is activated, it rotates the drive gear, which meshes with the drive gear, causing the drive gear to rotate. The drive gear then rotates the rotating rod, thereby rotating the display screen. If one drive component malfunctions, the operator activates the other drive component, which rotates the corresponding drive gear, thus rotating the display screen. This prevents interference with the display screen's rotation caused by the malfunction of one drive component.

[0023] 2. When the driving component drives the first worm and the second worm to rotate in the same direction, the worm wheel slides, causing the bracket to slide, which facilitates the adjustment of the display screen height; when the driving component drives the first worm and the second worm to rotate in opposite directions, the worm wheel rotates, causing the bracket to rotate, thereby causing the display screen to rotate. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the screen in Embodiment 1 of this application.

[0025] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0026] Figure 3 This is a schematic diagram of the overall structure of the screen in Embodiment 2 of this application.

[0027] Figure 4 This is a schematic diagram of the overall structure of the screen in Embodiment 3 of this application.

[0028] Figure 5 This is a schematic diagram of the structure of the first worm gear in Embodiment 3 of this application, used to illustrate the driving structure of the screen.

[0029] Figure 6This is a structural schematic diagram of the worm gear portion in Embodiment 3 of this application, used to illustrate the connection relationship between the worm gear and the support.

[0030] Figure 7 This is an exploded view of the worm gear and the first worm in Embodiment 3 of this application, used to illustrate the structure of the connecting rod.

[0031] Figure 8 This is a schematic diagram of the screen driving structure in Embodiment 4 of this application.

[0032] Figure 9 This is a side view of the screen in Embodiment 4 of this application.

[0033] Figure 10 yes Figure 9 Enlarged view of point B in the middle.

[0034] Reference numerals: 1. Mounting bracket; 2. Rotating rod; 3. Display screen; 4. Drive gear; 5. Driving gear; 6. Driving component; 7. Mounting plate; 9. Worm gear; 10. First worm; 11. Second worm; 12. Sliding sleeve; 13. Connecting rod; 14. Snap-fit ​​ball; 15. Receiving block; 16. Insertion hole; 17. Support; 18. Clamping frame; 19. Telescopic rod; 20. Turntable; 21. Bearing frame; 22. Drive assembly; 221. Driving rod; 222. Rack; 223. Active gear; 23. Groove; 24. Power component; 25. Snap-fit ​​groove; 26. Limiting ring; 27. Sliding groove; 28. Box body; 29. ​​Sliding block; 30. Roller; 31. Bracket; 32. Sliding rod. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-10 This application will be described in further detail.

[0036] Example 1, This application discloses a rotatable screen.

[0037] Reference Figure 1 and Figure 2 A rotatable screen includes a mounting frame 1 and a rotating rod 2 rotatably connected to the mounting frame 1 via bearings. A drive tooth 4 is rotatably connected to the mounting frame 1 via a rotating shaft. The drive tooth 4 is coaxially fixed with the rotating rod 2. Several drive teeth 5 are rotatably connected to the mounting frame 1 via bearings. In this application, two drive teeth 5 are preferably provided, and both drive teeth 5 mesh with the drive teeth 4. A drive component 6 for driving the drive teeth 5 to rotate is provided on the mounting frame 1. The drive component 6 is arranged in a one-to-one correspondence with the drive teeth 5. In this application, the drive component 6 is preferably a telescopic rotary motor. When the drive component 6 is started, the rotating shaft of the drive frame rotates, driving the drive teeth 5 to rotate.

[0038] Reference Figure 1 and Figure 2The display screen 3 is fixed to the outer wall of the rotating rod 2 by bolts. During the rotation of the rotating rod 2, the display screen 3 is rotated, which makes it easy for the staff to adjust the orientation of the display screen 3. During the use of the screen, when one of the driving components 6 fails, the staff can start the other driving component 6 to drive the gear 4 to rotate, thereby driving the display screen 3 to rotate normally, reducing the possibility of interference to the rotation of the display screen 3 caused by the failure of the driving component 6, so as not to affect the use of the screen.

[0039] According to Embodiment 1 of this application, the implementation principle of a rotatable screen is as follows: When the operator needs to adjust the orientation of the display screen 3 during the use of the screen, one of the driving components 6 is activated. The driving component 6 drives the driving gear 5 to rotate. The driving gear 5 meshes with the driving gear 4, which drives the rotating rod 2 to rotate, thereby driving the display screen 3 to rotate. When one of the driving components 6 fails, the operator activates the other driving component 6. Under the drive of the driving component 6, the display screen 3 rotates, thereby reducing the interference caused to the use of the screen.

[0040] Example 2, Example 2 differs from Example 1 in that: (Refer to...) Figure 3 A sliding groove 27 is provided on the side wall of the mounting frame 1. The sliding groove 27 is located inside the mounting frame 1. A box 28 is slidably connected to the mounting frame 1, and a sliding block 29 is slidably connected to the mounting frame 1. Rollers 30 are installed on the outer wall of the box 28, and rollers 30 are also installed on the outer wall of the sliding block 29. During the sliding process of the box 28 and the sliding block 29 on the mounting frame 1, the rollers 30 are driven to roll in the sliding groove 27, which reduces the friction between the box 28 and the mounting frame 1, and reduces the friction between the sliding block 29 and the mounting frame 1.

[0041] Reference Figure 2 and Figure 3 Both the drive gear 5 and the driving gear 4 are rotatably connected to the housing 28 via a rotating shaft. The drive components 6 are all installed inside the housing 28. The end of the rotating rod 2 away from the driving gear 4 is rotatably connected to the sliding block 29 via a bearing. As the operator pushes the display screen 3 along the length of the mounting frame 1, the roller 30 slides in the sliding groove 27, making it easy to set the display screen 3 in different positions on the mounting frame 1.

[0042] According to Embodiment 2 of this application, the implementation principle of a rotatable screen is as follows: by pushing the display screen 3, the roller 30 is fixed on the inner wall of the sliding groove 27, and the box 28 and the sliding block 29 slide on the mounting frame 1, so as to facilitate the adjustment of the relative position of the display screen 3 and the mounting frame 1.

[0043] Example 3, Example 3 differs from Example 2 in that: (Refer to...) Figure 4 and Figure 5Mounting plate 7 is bolted to mounting bracket 1. Bracket 31 is rotatably connected to mounting plate 7. One end of bracket 31 is bolted to the side wall of housing 28, and the other end is bolted to the side wall of sliding block 29. A first worm 10 and a second worm 11 are rotatably connected to the side wall of bracket 31. The first worm 10 is coaxial with one of the driving teeth 5, and the second worm 11 is coaxial with the other driving tooth 5. Worm wheel 9 is rotatably connected to the side wall of bracket 31. Worm wheel 9 is located between the first worm 10 and the second worm 11 and can slide along the length of bracket 31. When the first worm 10 and the second worm 11 rotate synchronously, the first worm 10 and the second worm 11 drive worm wheel 9 to slide along the length of bracket 31; when the first worm 10 and the second worm 11 rotate in opposite directions, the first worm 10 and the second worm 11 drive worm wheel 9 to rotate.

[0044] Reference Figure 4 and Figure 5 A sliding sleeve 12 is slidably connected to the outer wall of the rotating rod 2. A guide groove is provided on the outer wall of the sliding sleeve 12. The end of the rotating shaft of the worm gear 9 is slidably connected to the guide groove. The display screen 3 is fixedly connected to the outer wall of the sliding sleeve 12 by bolts. During the rotation of the rotating rod 2, the sliding sleeve 12 is driven to rotate, thereby driving the display screen 3 to rotate.

[0045] Reference Figure 5 and Figure 6 The rotating rod 2 is located on the side of the worm gear 9 away from the bracket 31. A through groove is provided through the side wall of the bracket 31. A sliding rod 32 is fixed to the side wall of the worm gear 9 by bolts. The sliding rod 32 is slidably connected to the through groove and to the side wall of the mounting plate 7. The sliding rod 32 can rotate on the side wall of the mounting plate 7. When the first worm 10 and the second worm 11 rotate synchronously, the first worm 10 and the second worm 11 drive the worm gear 9 to slide, thereby driving the sliding sleeve 12 to slide, thus driving the display screen 3 to slide along the length direction of the first worm 10. When the first worm 10 and the second worm 11 rotate in opposite directions, the worm gear 9 rotates, driving the sliding rod 32 to rotate, causing the bracket 31 to rotate, thereby driving the display screen 3 to rotate, making it easy to adjust the display screen 3 to tilt at different angles.

[0046] Reference Figure 5 and Figure 7Several connecting rods 13 are slidably connected to the side wall of the bracket 31. In this application, two connecting rods 13 are preferably provided. One connecting rod 13 is corresponding to the first worm gear 10, and the other connecting rod 13 is corresponding to the second worm gear 11. A sliding hole is opened on the outer wall of the connecting rod 13. A spring-loaded snap-fit ​​ball 14 is provided on the connecting rod 13. One end of the spring is fixedly connected to the inner wall of the sliding hole, and the other end is welded to the outer wall of the snap-fit ​​ball 14. The first worm gear 10 and the second worm gear... Each end of 11 is welded and fixed with a receiving block 15. The side wall of the receiving block 15 is provided with a insertion hole 16. The inner wall of the insertion hole 16 is provided with a first limiting hole. In this application, the driving component 6 is preferably a telescopic rotary motor. During the extension and retraction of the rotating shaft of the driving component 6, the connecting rod 13 is moved. The connecting rod 13 drives the locking ball 14 to be inserted into the insertion hole 16. During the rotation of the rotating shaft of the driving component 6, the locking ball 14 is locked in the first limiting hole, thereby driving the first worm gear 10 to rotate.

[0047] Reference Figure 7 A through hole is provided in the middle of the drive tooth 5, and a second limiting hole is provided on the inner wall of the drive tooth 5. The second limiting hole is located on the inner wall of the through hole. When it is necessary to drive the drive tooth 5 to rotate, the rotating shaft of the drive component 6 retracts, so that the locking ball 14 enters the through hole. During the rotation of the rotating shaft of the drive component 6, the locking ball 14 is driven to lock into the second limiting hole, thereby realizing the connection between the connecting rod 13 and the drive tooth 5, which facilitates driving the drive tooth 5 to rotate.

[0048] In Example 3, the implementation principle of a rotatable screen is as follows: The driving component 6 is activated, and its rotating shaft extends, causing the connecting rod 13 to slide towards the first worm gear 10. This causes the locking ball 14 to disengage from the second limiting hole, and the end of the connecting rod 13 and the locking ball 14 enter the insertion hole 16. During the rotation of the driving component 6's rotating shaft, the locking ball 14 engages in the first limiting hole. At this time, the driving component 6 can independently drive the first worm gear 10 to rotate, thereby driving the rotation and height adjustment of the display screen 3. After adjusting the display screen 3 to a suitable tilt angle, the driving component 6 is activated again, and its rotating shaft retracts, causing the locking ball 14 to engage in the second limiting hole. At this time, the driving component 6 can only drive the driving gear 5 to rotate, thereby driving the rotation of the display screen 3.

[0049] Example 4 Example 4 differs from Example 1 in that: (Refer to...) Figure 8 A support 17 is bolted to the mounting bracket 1, and a telescopic rod 19 is screwed to the support 17. A turntable 20 is rotatably connected to the end of the telescopic rod 19 away from the support 17. A limit ring 26 is welded and fixed to the outer wall of the turntable 20. A snap-fit ​​groove 25 is provided at the end of the telescopic rod 19, and the limit ring 26 is rotatably connected to the inner wall of the snap-fit ​​groove 25. A bearing frame 21 is bolted to the side wall of the turntable 20. (Refer to...) Figure 4 The display screen 3 is fixed to the support frame 21 with screws, and the display screen 3 rotates as the turntable 20 rotates.

[0050] Reference Figure 9 and Figure 10 The support 17 is provided with a drive assembly 22 for driving the telescopic rod 19 to extend and retract. The drive assembly 22 includes a drive rod 221 that slides on the support 17 and a rack 222 that slides on the support 17. A clamping frame 18 is welded and fixed on the support 17. The drive assembly 22 also includes an active tooth 223 that rotates on the two clamping frames 18. In this application, the active tooth 223 is cylindrical in shape. The rack 222 meshes with the active tooth 223. During the sliding process of the rack 222, it drives the active tooth 223 to rotate. Several grooves 23 are evenly spaced on the outer wall of the drive rod 221. The active tooth 223 meshes with the drive rod 221. During the rotation of the active tooth 223, it drives the drive rod 221 to slide. The drive rod 221 drives the turntable 20 to move, thereby driving the display screen 3 to move and realizing the fine adjustment of the height of the display screen 3.

[0051] Reference Figure 10 The support 17 is provided with a power component 24 for driving the rack 222 to slide. In this application, the power component 24 is preferably an electric cylinder. The piston rod of the power component 24 is fixedly connected to the rack 222 through a connecting rod. When the power component 24 is turned on, the piston rod of the power component 24 slides, thereby driving the rack 222 to slide.

[0052] In Embodiment 4 of this application, the implementation principle of a rotatable screen is as follows: The display screen 3 is fixedly connected to the support frame 21 by bolts. When the drive component 6 is activated, the rotating shaft of the drive component 6 rotates, driving the drive gear 5 to rotate. The drive gear 5 meshes with the drive gear 4, driving the drive gear 4 to rotate. The drive gear 4 drives the rotating rod 2 to rotate, thereby driving the display screen 3 to rotate. When the power component 24 is activated, the piston rod of the power component 24 slides, driving the rack 4 to slide. The rack 222 meshes with the active gear 223. The active gear 223 meshes with the drive rod 221, driving the drive rod 221 to slide. The drive rod 221 drives the turntable 20 to move. The turntable 20 drives the support frame 21 to move, driving the display screen 3 to move, thereby adjusting the height of the display screen 3.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A rotatable screen, comprising a mounting frame (1), a rotating rod (2) rotating on the mounting frame (1), and a display screen (3) fixed to the outer wall of the rotating rod (2), characterized in that: The mounting frame (1) is rotatably connected to a drive tooth (4), and the mounting frame (1) is rotatably connected to a plurality of drive teeth (5). The drive tooth (4) is coaxially fixed with the rotating rod (2), and the drive teeth (5) are all meshed with the drive tooth (4). The mounting frame (1) is provided with a plurality of drive members (6) for driving the drive teeth (5) to rotate, and the drive members (6) are arranged in a one-to-one correspondence with the drive teeth (5). A mounting plate (7) is fixed on the mounting bracket (1). The driving gear (5), the driving gear (4), and the driving component (6) are all disposed on the side wall of the mounting plate (7). A bracket (31) is slidably connected to the mounting plate (7). A worm gear (9) is rotatably connected to the bracket (31). A first worm (10) and a second worm (11) are rotatably connected to the bracket (31). A sliding sleeve (12) is slidably connected to the outer wall of the rotating rod (2). The display screen (3) is fixed to the outer wall of the sliding sleeve (12). The worm gear (9) is fixedly connected and can slide along the length direction of the bracket (31). The worm gear (9) drives the sliding sleeve (12) to slide. The driving member (6) is correspondingly arranged with the first worm (10) and the second worm (11). The driving member (6) can drive the first worm (10) to rotate and the second worm (11) to rotate. Both the first worm (10) and the second worm (11) are engaged with the worm gear (9). A plurality of connecting rods (13) are slidably connected to the bracket (31). The connecting rods (13) are arranged in a one-to-one correspondence with the driving teeth (5). The end of the connecting rod (13) is provided with a snap-fit ​​ball (14). The end of the first worm gear (10) is fixed with a receiving block (15). The side wall of the receiving block (15) is provided with an insertion hole (16). The inner wall of the insertion hole (16) is provided with a first limiting hole. The snap-fit ​​ball (14) can be inserted into the first limiting hole. The side wall of the driving teeth (5) is provided with a through hole. The inner wall of the driving teeth (5) is provided with a second limiting hole. The snap-fit ​​ball (14) can be inserted into the second limiting hole.

2. The rotatable screen according to claim 1, characterized in that: The mounting frame (1) is provided with a telescopic rod (19), and a turntable (20) is rotatably connected to the end of the telescopic rod (19). The rotating rod (2) is keyed to the turntable (20). A support frame (21) is provided on the turntable (20). The display screen (3) is fixed on the support frame (21). The mounting frame (1) is provided with a drive assembly (22) for driving the telescopic rod (19) to extend and retract.

3. A rotatable screen according to claim 2, characterized in that: The drive assembly (22) includes a drive rod (221) slidably connected to the mounting bracket (1), a rack (222) slidably on the mounting bracket (1), and an active tooth (223) rotating on the mounting bracket (1). The outer wall of the drive rod (221) is provided with a plurality of grooves (23) evenly spaced apart. The active tooth (223) engages with the grooves (23) and engages with the rack (222). The mounting bracket (1) is provided with a power component (24) for driving the rack (222) to slide.

4. A rotatable screen according to claim 3, characterized in that: The telescopic rod (19) has a snap-fit ​​groove (25) at its end, and a limit ring (26) is fixed on the outer wall of the turntable (20). The limit ring (26) is rotatably connected to the snap-fit ​​groove (25).

5. A rotatable screen according to claim 1, characterized in that: The mounting bracket (1) has a sliding groove (27) on its side wall. A box (28) is slidably connected to the mounting bracket (1). The driving tooth (5), the driving tooth (4), and the driving component (6) are all located inside the box (28). The end of the rotating rod (2) away from the driving tooth (4) can slide with the mounting bracket (1).

6. A rotatable screen according to claim 5, characterized in that: A sliding block (29) is slidably connected to the mounting bracket (1). The sliding block (29) is slidably connected to the sliding groove (27). The end of the rotating rod (2) away from the driving tooth (4) is rotatably connected to the sliding block (29). Rollers (30) are installed on the side walls of the sliding block (29) and the box body (28). The rollers (30) roll in the sliding groove (27).

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