Adjusting stand for naked-eye 3D display device

Abstract

The utility model discloses a kind of adjusting frame for naked eye 3D display device, it is related to adjusting frame technical field.The utility model includes bottom plate, the top of the bottom plate is fixedly connected with L-shaped plate, the top of the bottom plate is provided with lifting device, the lifting device includes screw rod, the surface of the screw rod is rotatably connected with the inner wall of L-shaped plate, the bottom of the screw rod is rotatably connected with fixed base one, the bottom of the fixed base one is fixedly connected with the top of bottom plate, the surface of the screw rod is threadedly connected with sliding seat, the surface of the sliding seat is fixedly connected with sliding plate, the utility model is moved by setting lifting device, specifically staff rotates screw rod, screw rod rotation will drive sliding seat, sliding seat moves will drive sliding plate to move, sliding plate will drive slider to slide on slide rail, sliding plate will drive adjusting device and rotating device to move up and down, finally drive display device to move up and down, staff is easy to operate, increase work efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of adjustment frame technology, and in particular relates to an adjustment frame for a naked-eye 3D display device. Background Technology

[0002] The adjustment frame for naked-eye 3D display devices is a precision mechanical support system specifically designed for naked-eye 3D display equipment. Its core function is to achieve optimal synchronization of three-dimensional visual effects by adjusting the relative position between the display device and the observer in multiple dimensions. This device must meet the physical constraints of human visual characteristics and display technology, and is a key auxiliary device in the field of human-computer interaction.

[0003] Traditional glasses-free 3D display devices use an adjustment bracket, which directly mounts the display device onto the bracket. Therefore, the angle cannot be freely adjusted, making it very troublesome for staff to adjust the angle or height, thus affecting the efficiency of use. Utility Model Content

[0004] The purpose of this utility model is to provide an adjustment frame for a naked-eye 3D display device. By setting up a lifting device, an adjustment device, and a rotating device, it solves the problem that in the existing traditional naked-eye 3D display device adjustment frames, the display device is directly mounted on the mounting frame, so the angle cannot be freely adjusted, which makes it very troublesome for the staff to adjust the angle or height, thus affecting the efficiency of use.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model is an adjustment frame for a naked-eye 3D display device, including a base plate, an L-shaped plate fixedly connected to the top of the base plate, and a lifting device provided on the top of the base plate; The lifting device includes a lead screw, the surface of which is rotatably connected to the inner wall of the L-shaped plate. A fixed seat is rotatably connected to the bottom of the lead screw, and the bottom of the fixed seat is fixedly connected to the top of the base plate. A slide block is threaded onto the surface of the lead screw, and a sliding plate is fixedly connected to the surface of the slide block. A fixed block is fixedly connected to the surface of the sliding plate, and an extension plate is fixedly connected to the top of the sliding plate. A slide rail is fixedly connected to the top of the base plate, and the top of the slide rail is fixedly connected to the top of the inner wall of the L-shaped plate. A slider is slidably connected to the surface of the slide rail, and the surface of the slider is fixedly connected to the surface of the sliding plate. An adjustment device and a rotation device are provided above the base plate.

[0006] Furthermore, the adjusting device includes a second fixing block, the surface of which is fixedly connected to the surface of a first fixing block. A connecting plate is rotatably connected to the surface of the second fixing block. A connecting frame is fixedly connected to the end of the connecting plate away from the second fixing block. A first connecting block is fixedly connected to the surface of the connecting frame, and a second connecting block is fixedly connected to the surface of the connecting frame. Both the first and second connecting blocks have slots at their tops. A connecting seat is hinged to the surface of the extension plate. A fixing cylinder is rotatably connected to the surface of the connecting seat. A nut is fixedly connected to the surface of the fixing cylinder. A one-way screw is threaded to the inner wall of the fixing cylinder. The end of the one-way screw away from the fixing cylinder is hinged to the inner wall of the connecting frame.

[0007] Furthermore, the rotating device includes a fixed rod one, which is fixedly connected to the inner wall of the slot. A fixed plate one is fixedly connected to the top of the fixed rod one. A double-acting screw is rotatably connected to the inner wall of the fixed plate one. A pressure plate one is threadedly connected to the end of the double-acting screw near the fixed plate one, and a pressure plate two is threadedly connected to the end of the double-acting screw away from the pressure plate one. The surface of the double-acting screw is rotatably connected to the inner wall of the slot. A long rod one is rotatably connected to the surface of the fixed rod one. A fixed rod two is rotatably connected to the inner wall of the end of the long rod one away from the fixed rod one. A rotating plate one is rotatably connected to the surface of the fixed rod two. The bottom of the long rod 1, away from the fixed rod 1, contacts the top of the rotating plate 1. The inner wall of the rotating plate 1, near the fixed rod 1, is rotatably connected to the surface of the fixed rod 1. The surface of the fixed rod 2 is rotatably connected to the rotating plate 2. The end of the rotating plate 2, away from the rotating plate 1, is hinged to a fixing frame. The surface of the fixing frame is fixedly connected to a mounting plate. The bottom of the fixed rod 1 is fixedly connected to the fixing plate 2. The top of the fixing plate 2 is rotatably connected to the bottom of the bidirectional lead screw. The surface of the fixed rod 1, near the fixing plate 2, is rotatably connected to the long rod 2. The inner wall of the long rod 2, away from the fixed rod 1, is rotatably connected to the fixing rod 2.

[0008] Furthermore, the inner wall of the slide block contacts the surface of the lead screw, the inner wall of the slider contacts the surface of the slide rail, and the surface of the lead screw penetrates the top of the L-shaped plate and extends to the outer end.

[0009] Furthermore, the surfaces of the fixed cylinder and the one-way lead screw are inclined, and the number of slots is set to two sets, with three slots in each set.

[0010] Furthermore, the inner wall of the first fixing plate is in contact with the surface of the first fixing plate, the surface of the bidirectional lead screw is in contact with the inner wall of the first pressure plate, the bottom of the first pressure plate is in contact with the top of the first long rod, and the inner wall of the second fixing rod is in contact with the surface of the second fixing rod.

[0011] Furthermore, the surface of the bidirectional lead screw contacts the inner wall of the second pressure plate, the top of the second pressure plate contacts the bottom of the second long rod, and the inner wall of the second long rod contacts the surface of the first fixed rod.

[0012] Furthermore, the inner wall of the first rotating plate is in contact with the surface of the first fixed rod, the bottom of the first rotating plate is in contact with the top of the second rotating plate, the inner walls of the first rotating plate and the second rotating plate are in contact with the surface of the second fixed rod, and the first rotating plate is located above the second rotating plate.

[0013] This utility model has the following beneficial effects: 1. This utility model incorporates a lifting device. Specifically, when the operator rotates a lead screw, the screw moves the slide block, which in turn moves the sliding plate. The sliding plate then moves the slider along the slide rail, which in turn moves the adjusting and rotating devices up and down, ultimately causing the display device to move up and down. This design makes the device easy to operate and increases work efficiency.

[0014] 2. This utility model, by setting an adjustment device, specifically by rotating a nut, causes the fixed cylinder to rotate, which in turn causes the connecting frame to move. The moving connecting frame causes the connecting plate to rotate on the surface of the fixed block, thus achieving the effect of adjusting the angle. This simplifies the operation process for staff and eliminates the need for other operations on the display device.

[0015] 3. This utility model incorporates a rotating device. Specifically, it grasps the display device and pushes it in the desired direction. The movement of the display device causes the mounting plate to move, which in turn causes the fixing frame to move. The fixing frame then causes the rotating plate two to rotate at various angles on the surface of the fixing rod two. The force applied to the rotating plate two causes the rotating plate one to rotate at various angles on the surface of the fixing rod one, thus achieving the effect of moving the display device. Finally, by rotating the bidirectional lead screw, the rotation of the bidirectional lead screw causes the pressure plate one and pressure plate two to move towards the center of the bidirectional lead screw. The movement of the fixing plate one and pressure plate two causes the long rod one and long rod two to be subjected to force. The force applied to the long rod one compresses the rotating plate one, and the force applied to the long rod two compresses the rotating plate two, achieving a fixing effect and preventing the display device from moving randomly after being fixed.

[0016] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the lifting device structure of this utility model; Figure 3 This is a schematic diagram of the adjusting device structure of this utility model; Figure 4 This is a schematic diagram of the rotating device structure of this utility model; Figure 5 This is a cross-sectional structural diagram of the rotating device of this utility model.

[0019] The attached diagram lists the components represented by each number as follows: 1. Base plate; 11. L-shaped plate; 2. Lifting device; 21. Lead screw; 22. Fixed seat one; 23. Slide seat; 24. Sliding plate; 25. Fixed block one; 26. Extension plate; 27. Slide rail; 28. Slider; 3. Adjusting device; 31. Fixed block two; 32. Connecting plate; 33. Connecting frame; 34. Connecting block one; 35. Connecting block two; 36. Slot; 37. Connecting seat; 38. Fixed cylinder; 39. One-way lead screw; 40. Nut; 4. Rotating device; 41. Fixed rod one; 42. Fixed plate one; 43. Two-way lead screw; 44. Pressure plate one; 45. Long rod one; 46. Fixed rod two; 47. Rotating plate one; 48. Rotating plate two; 49. Pressure plate two; 50. Long rod two; 51. Fixed plate two; 52. Fixed frame; 53. Mounting plate. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0021] Please see Figures 1-5 As shown, this utility model is an adjustment frame for a naked-eye 3D display device, including a base plate 1, an L-shaped plate 11 fixedly connected to the top of the base plate 1, and a lifting device 2 provided on the top of the base plate 1. The lifting device 2 includes a lead screw 21, the surface of which is rotatably connected to the inner wall of the L-shaped plate 11. A fixed seat 22 is rotatably connected to the bottom of the lead screw 21, and the bottom of the fixed seat 22 is fixedly connected to the top of the base plate 1. A slide block 23 is threaded onto the surface of the lead screw 21, a sliding plate 24 is fixedly connected to the surface of the slide block 23, a fixed block 25 is fixedly connected to the surface of the sliding plate 24, an extension plate 26 is fixedly connected to the top of the sliding plate 24, and a slide rail 27 is fixedly connected to the top of the inner wall of the L-shaped plate 11. A slider 28 is slidably connected to the surface of the rail 27. The surface of the slider 28 is fixedly connected to the surface of the sliding plate 24. An adjustment device 3 and a rotating device 4 are provided above the base plate 1. By setting up a lifting device, specifically, the operator rotates the lead screw, which drives the slide block to move. The movement of the slide block drives the sliding plate to move. The sliding plate drives the slider to slide on the rail. The sliding plate drives the adjustment device and the rotating device to move up and down. Finally, it drives the display device to move up and down. The operator can operate it easily and increase work efficiency.

[0022] The adjusting device 3 includes a second fixing block 31, the surface of which is fixedly connected to the surface of a first fixing block 25. A connecting plate 32 is rotatably connected to the surface of the second fixing block 31. A connecting frame 33 is fixedly connected to the end of the connecting plate 32 away from the second fixing block 31. A first connecting block 34 is fixedly connected to the surface of the connecting frame 33. A second connecting block 35 is fixedly connected to the surface of the connecting frame 33. Both the first connecting block 34 and the second connecting block 35 have slots 36 on their tops. A connecting seat 37 is hinged to the surface of the extension plate 26. A fixing cylinder 38 is rotatably connected to the surface of the connecting seat 37. A nut 40 is fixedly connected to the surface of the fixed cylinder 38, and a one-way screw 39 is threadedly connected to the inner wall of the fixed cylinder 38. The end of the one-way screw 39 away from the fixed cylinder 38 is hinged to the inner wall of the connecting frame 33. By setting an adjustment device, specifically by rotating the nut, the fixed cylinder will rotate, and the one-way screw will rotate, which will push the connecting frame to move. The movement of the connecting frame will cause the connecting plate to rotate on the surface of the fixed block 2, thereby achieving the effect of adjusting the angle. This simplifies the operation process for the staff and eliminates the need for other operations on the display device.

[0023] The rotating device 4 includes a fixed rod 41, which is fixedly connected to the inner wall of the slot 36. A fixed plate 42 is fixedly connected to the top of the fixed rod 41. A double-acting screw 43 is rotatably connected to the inner wall of the fixed plate 42. A pressure plate 44 is threadedly connected to the end of the double-acting screw 43 near the fixed plate 42, and a pressure plate 49 is threadedly connected to the end of the double-acting screw 43 away from the pressure plate 44. The surface of the double-acting screw 43 is rotatably connected to the inner wall of the slot 36. A long rod 45 is rotatably connected to the surface of the fixed rod 41. A fixed rod 46 is rotatably connected to the inner wall of the end of rod 45 away from fixed rod 41. A rotating plate 47 is rotatably connected to the surface of fixed rod 46. The bottom of the end of rod 45 away from fixed rod 41 contacts the top of rotating plate 47. The inner wall of the end of rotating plate 47 near fixed rod 41 is rotatably connected to the surface of fixed rod 41. A rotating plate 48 is rotatably connected to the surface of fixed rod 46. A fixing frame 52 is hinged to the end of rotating plate 48 away from rotating rod 47. A mounting plate is fixedly connected to the surface of fixing frame 52. 53. A fixing plate 51 is fixedly connected to the bottom of fixing rod 41. The top of fixing plate 51 is rotatably connected to the bottom of the double-acting screw 43. A long rod 50 is rotatably connected to the surface of fixing rod 41 near fixing plate 51. A fixing rod 46 is rotatably connected to the inner wall of the end of long rod 50 away from fixing rod 41. By setting a rotating device, specifically by grasping the display device and pushing it in the direction to be moved, the movement of the display device will drive the mounting plate to move, the mounting plate will drive the fixing frame to move, and the fixing frame will drive the rotating plate 46 to move. The surface of the fixed rod 2 rotates at various angles. The force on the rotating plate 2 causes the rotating plate 1 to rotate at various angles on the surface of the fixed rod 1, thus achieving the effect of moving the display device. Finally, by rotating the bidirectional lead screw, the rotation of the bidirectional lead screw will drive the pressure plate 1 and pressure plate 2 to move towards the center of the bidirectional lead screw. The movement of the fixed plate 1 and pressure plate 2 will cause the long rod 1 and long rod 2 to be subjected to force. The force on long rod 1 will squeeze the rotating plate 1, and the force on long rod 2 will squeeze the rotating plate 2, achieving the effect of fixing. The phenomenon of the display device moving randomly after being fixed will not occur.

[0024] The inner wall of the slide block 23 is in contact with the surface of the lead screw 21, the inner wall of the slider 28 is in contact with the surface of the slide rail 27, and the surface of the lead screw 21 penetrates through the top of the L-shaped plate 11 and extends to the outer end.

[0025] The surfaces of the fixed cylinder 38 and the one-way lead screw 39 are set with bevels, and the number of slots 36 is set to two sets, with three slots in each set.

[0026] The inner wall of the fixing plate 42 is in contact with the surface of the fixing plate 42, the surface of the bidirectional lead screw 43 is in contact with the inner wall of the pressure plate 44, the bottom of the pressure plate 44 is in contact with the top of the long rod 45, and the inner wall of the fixing rod 46 is in contact with the surface of the fixing rod 46.

[0027] The surface of the bidirectional lead screw 43 is in contact with the inner wall of the pressure plate 49, the top of the pressure plate 49 is in contact with the bottom of the long rod 50, and the inner wall of the long rod 50 is in contact with the surface of the fixed rod 41.

[0028] The inner wall of rotating plate 47 is in contact with the surface of fixed rod 41, the bottom of rotating plate 47 is in contact with the top of rotating plate 48, the inner walls of rotating plate 47 and rotating plate 48 are in contact with the surface of fixed rod 46, and rotating plate 47 is located above rotating plate 48.

[0029] One specific application of this embodiment is: When using the device, the operator first needs to install the display device on the mounting plate 53. After installation, the adjustment frame can be raised, lowered, rotated, and its angle adjusted as needed. To raise or lower the device, the operator needs to rotate the lead screw 21. Rotation of the lead screw 21 moves the slide block 23, which in turn moves the sliding plate 24. The sliding plate 24 then moves the slider 28 along the slide rail 27, causing the adjustment device 3 and the rotation device 4 to move up and down, ultimately moving the display device up and down. To adjust the angle of the display device, the operator needs to rotate the nut 40. Rotation of the nut 40 rotates the fixed cylinder 38, which in turn rotates the one-way lead screw 39. Rotation of the one-way lead screw 39 pushes the connecting frame 33 to move, causing the connecting plate 32 to rotate on the surface of the fixed block 31, thus adjusting the angle. This simplifies the operator's workflow and eliminates the need to manually adjust the display. When the device is used for other operations, such as when the display device needs to be moved left, right, forward, or backward, the operator can grab the display device and push it in the desired direction. The movement of the display device will cause the mounting plate 53 to move, which in turn will cause the fixing frame 52 to move. The fixing frame 52 will cause the rotating plate 48 to rotate at various angles on the surface of the fixing rod 46. The force on the rotating plate 48 will cause the rotating plate 47 to rotate at various angles on the surface of the fixing rod 41, thus achieving the effect of moving the display device. Finally, by rotating the bidirectional lead screw 43, the rotation of the bidirectional lead screw 43 will cause the pressure plate 44 and the pressure plate 49 to move towards the center of the bidirectional lead screw 43. The movement of the fixing plate 42 and the pressure plate 49 will cause the long rod 45 and the long rod 50 to be subjected to force. The force on the long rod 45 will squeeze the rotating plate 47, and the force on the long rod 50 will squeeze the rotating plate 48, thus achieving the effect of fixing the device and preventing it from moving randomly after being fixed.

[0030] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the present utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present utility model, thereby enabling those skilled in the art to better understand and utilize it. The present utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An adjustment frame for a glasses-free 3D display device, comprising a base plate (1), wherein an L-shaped plate (11) is fixedly connected to the top of the base plate (1), characterized in that: The top of the base plate (1) is provided with a lifting device (2); The lifting device (2) includes a lead screw (21), the surface of which is rotatably connected to the inner wall of the L-shaped plate (11), a fixed seat (22) is rotatably connected to the bottom of the lead screw (21), the bottom of the fixed seat (22) is fixedly connected to the top of the base plate (1), a slide (23) is threadedly connected to the surface of the lead screw (21), a sliding plate (24) is fixedly connected to the surface of the slide (23), and a fixed block (25) is fixedly connected to the surface of the sliding plate (24). An extension plate (26) is fixedly connected to the top of the sliding plate (24), and a slide rail (27) is fixedly connected to the top of the base plate (1). The top of the slide rail (27) is fixedly connected to the top of the inner wall of the L-shaped plate (11). A slider (28) is slidably connected to the surface of the slide rail (27). The surface of the slider (28) is fixedly connected to the surface of the sliding plate (24). An adjustment device (3) is provided above the base plate (1), and a rotating device (4) is provided above the base plate (1).

2. The adjustment frame for a glasses-free 3D display device according to claim 1, characterized in that, The adjusting device (3) includes a second fixed block (31), the surface of the second fixed block (31) is fixedly connected to the surface of the first fixed block (25), a connecting plate (32) is rotatably connected to the surface of the second fixed block (31), a connecting frame (33) is fixedly connected to the end of the connecting plate (32) away from the second fixed block (31), a connecting block (34) is fixedly connected to the surface of the connecting frame (33), a connecting block (35) is fixedly connected to the surface of the connecting frame (33), slots (36) are opened on the top of both the first connecting block (34) and the second connecting block (35), a connecting seat (37) is hinged to the surface of the extension plate (26), a fixed cylinder (38) is rotatably connected to the surface of the connecting seat (37), a nut (40) is fixedly connected to the surface of the fixed cylinder (38), a one-way screw (39) is threaded to the inner wall of the fixed cylinder (38), and the end of the one-way screw (39) away from the fixed cylinder (38) is hinged to the inner wall of the connecting frame (33).

3. The adjustment frame for a glasses-free 3D display device according to claim 2, characterized in that, The rotating device (4) includes a fixed rod (41), which is fixedly connected to the inner wall of the slot (36). A fixed plate (42) is fixedly connected to the top of the fixed rod (41). A double-acting screw (43) is rotatably connected to the inner wall of the fixed plate (42). A pressure plate (44) is threadedly connected to the end of the double-acting screw (43) near the fixed plate (42). A pressure plate (49) is threadedly connected to the end of the double-acting screw (43) away from the pressure plate (44). The surface of the double-acting screw (43) is rotatably connected to the inner wall of the slot (36). A long rod (45) is rotatably connected to the surface of the fixed rod (41). A fixed rod (46) is rotatably connected to the inner wall of the end of the long rod (45) away from the fixed rod (41). A rotating plate (47) is rotatably connected to the surface of the fixed rod (46). The bottom of the end of rod 1 (45) away from fixed rod 1 (41) is in contact with the top of rotating plate 1 (47). The inner wall of the end of rotating plate 1 (47) near fixed rod 1 (41) is rotatably connected to the surface of fixed rod 1 (41). Rotating plate 2 (48) is rotatably connected to the surface of fixed rod 2 (46). A fixing frame (52) is hinged to the end of rotating plate 2 (48) away from rotating plate 1 (47). A mounting plate (53) is fixedly connected to the surface of fixing frame (52). Fixing plate 2 (51) is fixedly connected to the bottom of fixed rod 1 (41). The top of fixing plate 2 (51) is rotatably connected to the bottom of double-acting screw (43). Long rod 2 (50) is rotatably connected to the surface of the end of fixed rod 1 (41) near fixing plate 2 (51). Fixing rod 2 (46) is rotatably connected to the inner wall of the end of long rod 2 (50) away from fixed rod 1 (41).

4. The adjustment frame for a glasses-free 3D display device according to claim 3, characterized in that, The inner wall of the slide block (23) is in contact with the surface of the lead screw (21), the inner wall of the slider (28) is in contact with the surface of the slide rail (27), and the surface of the lead screw (21) penetrates the top of the L-shaped plate (11) and extends to the outer end.

5. The adjustment frame for a glasses-free 3D display device according to claim 4, characterized in that, The surfaces of the fixed cylinder (38) and the one-way lead screw (39) are set at an angle, and the number of slots (36) is set to two groups, with three slots in each group.

6. The adjustment frame for a glasses-free 3D display device according to claim 5, characterized in that, The inner wall of the first fixing plate (42) is in contact with the surface of the first fixing plate (42), the surface of the bidirectional lead screw (43) is in contact with the inner wall of the first pressure plate (44), the bottom of the first pressure plate (44) is in contact with the top of the first long rod (45), and the inner wall of the second fixing rod (46) is in contact with the surface of the second fixing rod (46).

7. The adjustment frame for a glasses-free 3D display device according to claim 6, characterized in that, The surface of the bidirectional lead screw (43) is in contact with the inner wall of the pressure plate (49), the top of the pressure plate (49) is in contact with the bottom of the long rod (50), and the inner wall of the long rod (50) is in contact with the surface of the fixing rod (41).

8. The adjustment frame for a glasses-free 3D display device according to claim 7, characterized in that, The inner wall of the first rotating plate (47) is in contact with the surface of the first fixed rod (41), the bottom of the first rotating plate (47) is in contact with the top of the second rotating plate (48), the inner walls of the first rotating plate (47) and the second rotating plate (48) are in contact with the surface of the second fixed rod (46), and the first rotating plate (47) is located above the second rotating plate (48).

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