Brake device for controlling opening and closing of all-sky dome through direct current motor

Abstract

The utility model provides a direct current motor control all-sky-area dome opening and closing belt brake device which comprises an enclosing wall arranged on the ground, an inner cavity of the enclosing wall is hollow, the top of the enclosing wall is open, the top of the enclosing wall is provided with two round windows which are oppositely arranged and seal the top opening part of the enclosing wall, and two oppositely-arranged mounting plates are fixed to the side, facing the enclosing wall, of each round window. The installation plate is flush with the end of the round window, and a control assembly for controlling the round window to be opened to expose the top opening part of the enclosing wall or controlling the round window to be closed to seal the top opening part of the enclosing wall is arranged on the side wall of an inner cavity of the enclosing wall. The rotation of the round window is limited through the first limiting assembly, and when the device breaks down, the possibility that the round window rotates rapidly under the action of gravity to damage the enclosing wall or astronomical equipment in the enclosing wall is reduced through the first limiting assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of astronomical equipment, in particular to a DC motor-controlled full-sky dome opening and closing device with a brake. Background Art

[0002] As astronomical science equipment such as astronomical telescopes and planetarium projectors are widely used in primary and secondary schools across the country, observatories or astronomical observation stations that house astronomical science equipment such as astronomical telescopes and planetarium projectors are attracting more and more attention.

[0003] In order to allow people to use astronomical telescopes for astronomical observations, astronomical domes are installed. The top can be opened for easy observation, and closed to protect the internal components. The astronomical dome needs to allow celestial radiation to enter the receiver freely and with as little distortion as possible when the telescope is working, and avoid adverse factors such as wind vibration, temperature changes, rain, moisture, and dust as much as possible. When the telescope is not working, it should be well sealed so that the instrument is not affected by external environmental factors. In addition, the astronomical dome should be reliable, safe, easy to maintain, beautiful in appearance, and coordinated with the environment.

[0004] Most panoramic astronomical domes are composed of a base and multiple openable and closable skylights. They have good thermal insulation, dust and water resistance, impact resistance and other protective properties, so that they can better protect astronomical equipment. However, the traditional full-sky dome device has a skylight that is affected by factors such as volume and material, and its overall mass is relatively large. Once the opening and closing device fails, the skylight rotates rapidly under the action of gravity, causing damage to the precise astronomical equipment inside the astronomical dome. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the utility model proposes a DC motor controlled full sky dome opening and closing device with brakes, comprising a wall arranged on the ground, the inner cavity of the wall is hollow, and the top is open, and the top of the wall is provided with two round windows arranged oppositely and closing the opening part of the top of the wall, each of the round windows is fixed with two mounting plates arranged oppositely facing one side of the wall, and the mounting plates are flush with the ends of the round windows, and a control component for controlling the round window to open and expose the opening part of the top of the wall or to close and close the opening part of the top of the wall is provided on the side wall of the inner cavity of the wall, and a first limiting component for limiting the opening and closing of the round window is provided on the wall.

[0006] To achieve the above purpose, power is provided by a control component to drive two relatively arranged round windows to open or close, so as to expose the opening part at the top of the wall or to close the opening part at the top of the wall. During the opening and closing process of the round windows, the first limiting component limits the rotation of the round windows. When the device fails, the first limiting component reduces the possibility of the round windows rotating rapidly under the action of gravity and damaging the wall or astronomical equipment inside the wall.

[0007] Furthermore, the control component includes four control boxes fixed on the inner wall of the wall, the control box is rotatably connected to a short shaft on the side facing away from the inner wall of the wall, a connecting rod is fixed on the short shaft, and the end of the connecting rod away from the short shaft is hingedly connected to an adjacent mounting plate, the inner cavity of the control box is hollow, and each of the control box cavities is provided with a driving component for driving the short shaft to rotate.

[0008] Through the above technical solution, the driving assembly provides power to drive the short shaft to rotate. The rotation of the short shaft will drive the connecting rod fixed to the short shaft to rotate. The rotation of the connecting rod will drive the mounting plate and the round window of the integrated structure to rotate, thereby realizing the opening and closing of the round window.

[0009] Furthermore, the drive assembly includes two ear seats fixed on the groove wall of the control box inner cavity, a worm is rotatably connected between the two ear seats, a motor for driving the worm to rotate is fixed on one of the ear seats, a turbine meshing with the worm is rotatably connected to the control box inner cavity, one end of the short shaft penetrates into the control box inner cavity and is rotatably connected to the control box, and the end of the short shaft penetrating into the control box inner cavity is coaxially fixed to the turbine.

[0010] Through the above technical solution, the motor provides power to drive the worm to rotate, and the power is transmitted through the mutually meshing worm and turbine to drive the short shaft to rotate.

[0011] Furthermore, the first limiting assembly includes a rocker arm fixed on the short shaft and rotatably connected to the side of the control box away from the wall, the rocker arm is hingedly connected to an upper ear block at one end away from the short shaft, the control box is hingedly connected to a lower ear block located below the short shaft at the side away from the wall, and the upper ear block and the lower ear block are fixedly connected by a spring.

[0012] Through the above technical solution, when the short shaft, connecting rod and rocker arm of the integrated structure rotate, the spring will be driven to rotate, stretch and contract, and the rotation of the short shaft will be limited and pulled through the action of the spring.

[0013] Furthermore, a second limiting component for improving the opening and closing stability of the round window is provided on the surrounding wall.

[0014] Through the above technical solution and the second limiting component, the opening and closing stability of the round window is further improved.

[0015] Furthermore, the second limiting component includes a strip slide groove opened on each mounting plate facing the side of the wall, a strip slide rail is fixed between the bottom and the top of the inner cavity of the strip slide groove, a slider is slidably connected to the strip slide rail, the slider extends out of the mounting plate through the strip slide groove, a connecting plate is fixed to the side of the slider extending out of the mounting plate, grooves are opened at the four end corners of the upper surface of the wall, a dead stop is fixed in the groove, and the dead stop is hingedly connected to the connecting plate.

[0016] Through the above technical solution, during the opening and closing process of the round window, the cooperation between the slider and the strip slide rail plays a guiding and limiting role in the rotation of the round window.

[0017] Furthermore, a gap is left between the strip slide rail and the wall of the strip slide groove, and a brake assembly cooperating with the slider is provided in the gap between the strip slide rail and the wall of the strip slide groove.

[0018] According to the above technical solution, when the control component and the drive component fail and cause the round window to rotate rapidly, the brake component can be used to make the round window stuck and will not hit the wall quickly.

[0019] Furthermore, the brake assembly includes a positioning box arranged in the gap between the strip slide rail and the strip slide groove wall, the positioning box has a hollow inner cavity, a leaf spring is fixed in the inner cavity of the positioning box, a pull rod is fixed in the middle position of the leaf spring, the top of the pull rod passes through the positioning box, a connecting rope is fixed to the part of the pull rod passing through the positioning box, the connecting rope passes through the mounting plate at one end away from the pull rod, a turntable is rotatably connected to the groove wall of the inner cavity of the wall, an electric motor for driving the turntable to rotate is fixed on the wall, one end of the connecting rope passing through the mounting plate is fixed to the turntable and wrapped around the turntable, the bottom of the pull rod is hingedly connected to two relatively arranged metal sheets, the metal sheets are hingedly connected to the positioning box through the positioning rod, and movable grooves that are connected to the inner cavity of the positioning box and matched with the size of the metal sheet are opened on both sides of the positioning box, the positioning box is fixed to the slider, and relatively arranged racks are fixed to the two side walls of the strip slide.

[0020] Through the above technical solution, the electric motor provides power to drive the turntable to rotate, which in turn drives the connecting rope to be wrapped around the outside of the turntable. By controlling the length of the connecting rope extending out of the turntable, the state of the leaf spring is controlled. When the leaf spring is in a contracted state, the metal sheet does not affect the sliding of the slider. When the leaf spring is in a stretched state, the metal sheet is stuck in the adjacent rack, which has a braking effect.

[0021] In summary, the DC motor controlled full sky dome opening and closing with brake device has the following beneficial effects:

[0022] (1) The DC motor controls the opening and closing of the omnidirectional dome with a brake device, which provides power through the control component to drive the two relatively arranged round windows to open or close, so as to expose the opening portion of the top of the enclosure or to close the opening portion of the top of the enclosure. During the opening and closing process of the round windows, the first limit component limits the rotation of the round windows. When the device fails, the first limit component reduces the possibility of the round windows rotating rapidly under the action of gravity and damaging the enclosure or the astronomical equipment in the enclosure.

[0023] (2) The DC motor controls the opening and closing of the omnidirectional dome with a brake device. The motor provides power to drive the turntable to rotate, thereby driving the connecting rope to be wrapped around the outside of the turntable. By controlling the length of the connecting rope extending out of the turntable, the state of the leaf spring is controlled. When the leaf spring is in a contracted state, the metal sheet does not affect the sliding of the slider. When the leaf spring is in a stretched state, the metal sheet is stuck in the adjacent rack, which has a braking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The utility model is further described and elaborated below in conjunction with the accompanying drawings.

[0025] Figure 1 It is a schematic diagram of the overall structure of the preferred embodiment of the utility model;

[0026] Figure 2 It is a schematic diagram of the structure of the round window of the utility model when it is opened;

[0027] Figure 3 The utility model Figure 2 The enlarged structural diagram is shown in the figure;

[0028] Figure 4 A partial cross-sectional structural diagram of a control box of the utility model;

[0029] Figure 5 This is a schematic diagram of the connection structure between the connecting plate and the slider of the utility model;

[0030] Figure 6 It is a partial cross-sectional structural schematic diagram of the positioning box of the utility model.

[0031] Figure numerals: 1. wall; 2. round window; 3. mounting plate; 4. control box; 5. short shaft; 6. connecting rod; 7. ear seat; 8. worm; 9. motor; 10. turbine; 11. rocker arm; 12. upper ear block; 13. lower ear block; 14. spring; 15. strip slide groove; 16. strip slide rail; 17. slider; 18. connecting plate; 19. groove; 20. dead stop; 21. positioning box; 22. leaf spring; 23. pull rod; 24. connecting rope; 25. metal sheet; 26. movable groove; 27. rack. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be more clearly and completely explained below by describing the preferred embodiments of the present invention in combination with the accompanying drawings.

[0033] like Figure 1-6As shown, a DC motor controls the opening and closing of the omnidirectional dome with a brake device in a preferred embodiment of the utility model, wherein a fence 1 is arranged on the ground, the inner cavity of the fence 1 is hollow, and the top is open. Two round windows 2 which are arranged opposite to each other and close the top opening of the fence 1 are arranged on the top of the fence 1, and two mounting plates 3 which are arranged opposite to each other are fixed to one side of each round window 2 facing the fence 1, and the mounting plates 3 are flush with the ends of the round windows 2, and a control component for controlling the round windows 2 to open and expose the top opening of the fence 1 or controlling the round windows 2 to close and close the top opening of the fence 1 is arranged on the side wall of the inner cavity of the fence 1.

[0034] The control assembly includes four control boxes 4 fixed on the inner groove wall of the wall 1. The four control boxes 4 are respectively fixed at the four end corners of the inner groove wall of the wall 1, and the top of the control box 4 is flush with the top of the wall 1. The control box 4 is rotatably connected to the side away from the groove wall of the wall 1 with a short shaft 5, and a connecting rod 6 is fixed on the short shaft 5. The end of the connecting rod 6 away from the short shaft 5 is hingedly connected to the adjacent mounting plate 3. The inner cavity of the control box 4 is hollow, and the inner cavity of each control box 4 is provided with a driving assembly for driving the short shaft 5 to rotate.

[0035] like Figure 2 and Figure 3 and Figure 4 The driving assembly includes two ear seats 7 fixed on the inner groove wall of the control box 4, a worm 8 is rotatably connected between the two ear seats 7, a motor 9 for driving the worm 8 to rotate is fixed on one of the ear seats 7, a turbine 10 meshing with the worm 8 is rotatably connected to the inner cavity of the control box 4, one end of the short shaft 5 penetrates into the inner cavity of the control box 4 and is rotatably connected to the control box 4, and one end of the short shaft 5 penetrating into the inner cavity of the control box 4 is coaxially fixed to the turbine 10.

[0036] like Figure 4 The motor 9 provides power to drive the worm 8 coaxially fixed with the output shaft of the motor 9 to rotate. The worm 8 and the turbine 10 mesh with each other. The worm 8 and the turbine 10 cooperate to provide power to drive the short shaft 5 coaxially fixed with the turbine 10 to rotate. The rotation of the short shaft 5 will drive the connecting rod 6 fixed with the short shaft 5 to rotate. The rotation of the connecting rod 6 controls the opening and closing of the round window 2.

[0037] like Figure 1 and Figure 2 In order to improve the opening and closing stability of the round window 2, a first limit assembly for improving the opening and closing stability of the connecting rod 6 and the round window 2 is provided on the control box 4.

[0038] like Figure 3 The first limiting assembly includes a swing arm 11 fixed on the short shaft 5 and rotatably connected to the side of the control box 4 away from the wall 1. The end of the swing arm 11 away from the short shaft 5 is hingedly connected to an upper ear block 12. The side of the control box 4 away from the wall 1 is hingedly connected to a lower ear block 13 located below the short shaft 5. The upper ear block 12 and the lower ear block 13 are fixedly connected by a spring 14.

[0039] like Figure 3 When the short shaft 5 rotates, it will drive the connecting rod 6 and the rocker arm 11 of the integrated structure to rotate, and the spring 14 will pull the rotation of the connecting rod 6 to improve the rotation stability of the connecting rod 6 and the round window 2.

[0040] like Figure 2 and Figure 5 In order to further improve the opening and closing stability of the round window 2 , a second limiting component for improving the opening and closing stability of the round window 2 is provided on the surrounding wall 1 .

[0041] like Figure 5 The second limiting component includes a strip slide groove 15 opened on the side of each mounting plate 3 facing the wall 1, a strip slide rail 16 is fixed between the bottom and the top of the inner cavity of the strip slide groove 15, a slider 17 is slidably connected to the strip slide rail 16, the slider 17 is slidably connected to the strip slide groove 15, the slider 17 extends out of the mounting plate 3 through the strip slide groove 15, and a connecting plate 18 is fixed to one side of the slider 17 extending out of the mounting plate 3. Grooves 19 are opened at the four end corners of the upper surface of the wall 1, and a dead stop 20 is fixed in the groove 19, and the dead stop 20 is hingedly connected to the connecting plate 18.

[0042] like Figure 5 and Figure 6 When the round window 2 is opened and closed, the integrated round window 2 and the mounting plate 3 rotate, and the cooperation of the slider 17 and the strip rail 16 plays a guiding and limiting role on the rotation of the round window 2, further improving the stability of the opening and closing of the round window 2.

[0043] like Figure 6 In order to reduce the possibility of the round window 2 rotating rapidly and damaging the device due to device failure when the round window 2 is opened and closed, a brake component is provided on the mounting plate 3 to cooperate with the slider 17 to act as a brake in the event of device failure.

[0044] like Figure 6 A gap is left between the strip slide rail 16 and the groove wall of the strip slide groove 15. The brake assembly includes a positioning box 21 arranged in the gap between the strip slide rail 16 and the groove wall of the strip slide groove 15. The inner cavity of the positioning box 21 is hollow. A leaf spring 22 is fixed to the inner cavity of the positioning box 21. A pull rod 23 is fixed to the middle position of the leaf spring 22. Both ends of the pull rod 23 are penetrated by leaf springs 22. A circular hole communicating with the inner cavity of the positioning box 21 is opened in the middle position of the upper surface of the positioning box 21. The pull rod 23 passes through the top of the leaf spring 22 and passes through the positioning box 21 through the circular hole. A connecting rope 24 is fixed to the part of the pull rod 23 passing through the positioning box 21. The end of the connecting rope 24 away from the pull rod 23 passes through the mounting plate 3. A turntable is rotatably connected to the inner cavity wall of the fence 1. A motor that drives the turntable to rotate is fixed to the fence 1. One end of the connecting rope 24 passes through the mounting plate 3 and is fixed to the turntable and wrapped around the turntable.

[0045] like Figure 6The pull rod 23 passes through the bottom of the leaf spring 22 and is hingedly connected to two relatively arranged metal sheets 25. The metal sheets 25 are located in the inner cavity of the positioning box 21. The metal sheets 25 and the positioning box 21 are hingedly connected through the positioning rod. Both sides of the positioning box 21 are provided with movable grooves 26 that are connected to the inner cavity of the positioning box 21 and are adapted to the size of the metal sheets 25. The metal sheet 25 enters the movable groove 26, and the positioning box 21 is fixed to the slider 17. The two side walls of the strip slide 15 are fixed with relatively arranged racks 27, and the racks 27 are adapted to the metal sheets 25.

[0046] like Figure 6 During the opening and closing process of the round window 2, the motor provides power to drive the connecting rope 24 to rotate and wrap around the turntable. The connecting rope 24 always pulls the pull rod 23 fixed to the connecting rope 24, and the pull rod 23 drives the leaf spring 22 to be pulled. Under the pulling force of the connecting rope 24, the leaf spring 22 causes the two metal sheets 25 to rotate inward and tighten. However, when the device fails during the opening process of the round window 2, the round window 2 rotates and falls rapidly. Under the action of centrifugal force and gravity, the connecting rope 24 breaks, and the leaf spring 22 relaxes, driving the ends of the two metal sheets 25 to extend out of the positioning box 21 through the movable groove 26, and the part of the metal sheet 25 extending out of the positioning box 21 is stuck in the rack 27 to achieve braking.

[0047] When in use, the power supply is turned on, the switch is turned on, and when the two round windows 2 need to be opened to expose the opening part at the top of the wall 1, the four motors 9 are turned on, and the motor 9 provides power to drive the worm 8 coaxially fixed with the output shaft of the motor 9 to rotate, and the rotation of the worm 8 will drive the turbine 10 meshing with the worm 8 to rotate, and the rotation of the turbine 10 will drive the short shaft 5 coaxially fixed with the turbine 10 to rotate, and the rotation of the short shaft 5 will drive the swing rod 11 and the connecting rod 6 fixed with the short shaft 5 to rotate, and the rotation of the connecting rod 6 will drive the mounting plate 3 hingedly connected to the connecting rod 6 and the round window 2 to rotate and open, and the rotation of the connecting rod 6 is limited by the spring 14, and the rotation of the mounting plate 3 will drive the bar slide 16 fixed to the mounting plate 3 to rotate, and the bar slide 16 rotates and is slidably connected with the connecting plate 18 hingedly connected to the wall 1 and the slider 17 fixed to the connecting plate 18, and the cooperation of the bar slide 16 and the slider 17 plays a limiting and guiding role in the rotation of the round window 2 and the mounting plate 3, thereby improving the stability of the movement of the round window 2;

[0048] When closing the round window 2, the motor 9 drives the worm 8 to rotate in reverse, thereby driving the connecting rod 6 to rotate in reverse. The reverse rotation of the connecting rod 6 drives the round window 2 and the mounting plate 3 hingedly connected to the connecting rod 6 to rotate in the opposite direction, thereby closing the two round windows 2.

[0049] During the opening and closing process of the two round windows 2, the motor provides power to drive the turntable to rotate. The rotation of the turntable controls the connecting rope 24 to extend the length of the turntable. The connecting rope 24 always pulls the pull rod 23 fixed to the connecting rope 24, and the pull rod 23 drives the leaf spring 22 to be pulled. Under the pulling force of the connecting rope 24, the leaf spring 22 causes the two metal sheets 25 to rotate inward and tighten. The metal sheets 25 are always located in the inner cavity of the positioning box 21. Once the device fails, the round window 2 and the mounting plate 3 rotate rapidly under the action of gravity and eccentricity, the connecting rope 24 breaks, and the leaf spring 22 rebounds, driving the two metal sheets 25 to rotate in the opposite direction. The metal sheets 25 rotate in the opposite direction and pass through the positioning box 21 through the movable groove 26. The part of the metal sheet 25 passing through the positioning box 21 is clamped and connected with the adjacent rack 27, which plays a positioning role for the slider 17 fixed to the positioning box 21. At this time, the round window 2 stops rotating rapidly and there is a possibility of damaging the device.

[0050] The above specific implementations are only descriptions of the preferred implementations of the utility model, and do not limit the protection scope of the utility model. Under the premise of not departing from the design concept and spirit of the utility model, various deformations, substitutions and improvements made by ordinary technicians in this field to the technical solution of the utility model based on the text description and drawings provided by the utility model should all fall within the protection scope of the utility model. The protection scope of the utility model is determined by the claims.

Claims

1. The DC motor controls the opening and closing of the full-sky dome with a brake device, characterized in that: The invention comprises a wall (1) arranged on the ground, wherein the inner cavity of the wall (1) is hollow and the top is open, and two round windows (2) arranged opposite to each other and closing the top opening of the wall (1) are arranged on the top of the wall (1), and two mounting plates (3) arranged opposite to each other are fixed on the side of each round window (2) facing the wall (1), and the mounting plates (3) are flush with the ends of the round windows (2), and a control component for controlling the round windows (2) to open to expose the top opening of the wall (1) or to close to close the top opening of the wall (1) is arranged on the side wall of the inner cavity of the wall (1), and a first limiting component for limiting the opening and closing of the round windows (2) is provided on the wall (1).

2. The DC motor controlled full sky dome opening and closing device with brake according to claim 1 is characterized in that: The control assembly comprises four control boxes (4) fixed on the inner wall of the enclosure (1); the control box (4) is rotatably connected to a short shaft (5) on the side facing away from the inner wall of the enclosure (1); a connecting rod (6) is fixed on the short shaft (5); one end of the connecting rod (6) away from the short shaft (5) is hingedly connected to an adjacent mounting plate (3); the inner cavity of the control box (4) is hollow; and a driving assembly for driving the short shaft (5) to rotate is provided in the inner cavity of each control box (4).

3. The DC motor controlled full sky dome opening and closing device with brake according to claim 2 is characterized in that: The driving assembly comprises two ear seats (7) fixed on the inner cavity groove wall of the control box (4); a worm (8) is rotatably connected between the two ear seats (7); a motor (9) for driving the worm (8) to rotate is fixed on one of the ear seats (7); a turbine (10) meshing with the worm (8) is rotatably connected to the inner cavity of the control box (4); one end of the short shaft (5) penetrates into the inner cavity of the control box (4) and is rotatably connected to the control box (4); and the end of the short shaft (5) that penetrates into the inner cavity of the control box (4) is coaxially fixed to the turbine (10).

4. The DC motor controlled full sky dome opening and closing device with brake according to claim 3 is characterized in that: The first limit assembly comprises a swing arm (11) fixed on the short shaft (5) and rotatably connected to the side of the control box (4) facing away from the wall (1); an upper ear block (12) is hingedly connected to the end of the swing arm (11) away from the short shaft (5); a lower ear block (13) located below the short shaft (5) is hingedly connected to the side of the control box (4) facing away from the wall (1); and the upper ear block (12) and the lower ear block (13) are fixedly connected via a spring (14).

5. The DC motor controlled full sky dome opening and closing device with brake according to claim 1, characterized in that: The enclosure (1) is provided with a second limiting component for improving the opening and closing stability of the round window (2).

6. The DC motor controlled full sky dome opening and closing device with brake according to claim 5, characterized in that: The second limiting assembly comprises a strip-shaped slide groove (15) provided on the side of each mounting plate (3) facing the enclosure (1); a strip-shaped slide rail (16) is fixed between the bottom and top of the inner cavity of the strip-shaped slide groove (15); a slider (17) is slidably connected to the strip-shaped slide rail (16); the slider (17) extends out of the mounting plate (3) through the strip-shaped slide groove (15); a connecting plate (18) is fixed to the side of the slider (17) extending out of the mounting plate (3); grooves (19) are provided at the four end corners of the upper surface of the enclosure (1); a dead stop (20) is fixed in the groove (19); and the dead stop (20) is hingedly connected to the connecting plate (18).

7. The DC motor controlled full sky dome opening and closing device with brake according to claim 6, characterized in that: The mounting plate (3) is provided with a brake assembly that cooperates with the slider (17).

8. The DC motor controlled full sky dome opening and closing device with brake according to claim 7, characterized in that: The brake assembly comprises a positioning box (21) arranged in the gap between the strip slide rail (16) and the groove wall of the strip slide groove (15); the inner cavity of the positioning box (21) is hollow; a leaf spring (22) is fixed to the inner cavity of the positioning box (21); a pull rod (23) is fixed to the middle position of the leaf spring (22); the top of the pull rod (23) passes through the positioning box (21); a connecting rope (24) is fixed to the part of the pull rod (23) passing through the positioning box (21); the end of the connecting rope (24) away from the pull rod (23) passes through the mounting plate (3); a turntable is rotatably connected to the inner groove wall of the enclosure (1); a motor for driving the turntable to rotate is fixed to the enclosure (1); one end of the connecting rope (24) passing through the mounting plate (3) is fixed to the turntable and is wound around the turntable; The bottom of the pull rod (23) is hingedly connected to two relatively arranged metal sheets (25), and the metal sheet (25) is hingedly connected to the positioning box (21) through the positioning rod. Both sides of the positioning box (21) are provided with movable grooves (26) that are connected to the inner cavity of the positioning box (21) and are adapted to the size of the metal sheet (25). The positioning box (21) is fixed to the slider (17), and relatively arranged racks (27) are fixed to the two side walls of the strip slide groove (15).

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