A rail transit suspended smart screen with self-cleaning ability

Abstract

The present invention discloses a rail transit suspended smart screen with self-cleaning ability, which belongs to the field of smart screen technology, including a support platform installed on the rail transit ceiling, a heat sink is arranged at the bottom of the support platform, a heat dissipation mechanism is arranged on the heat sink, a storage port is opened in the support platform on both sides of the heat sink, and support guide rails are arranged on both sides of the inner wall of the storage port, the support guide rails are connected to a suspension shaft through a displacement component, and the suspension shaft is connected to a smart display screen through a plurality of connecting blocks, and a tilting angle adjustment component is arranged on the connecting block, and a cleaning shaft is arranged at the bottom of the support platform at the storage port, and a cleaning cotton cylinder is fixedly connected to the outer wall of the cleaning shaft. The present invention utilizes the movement of the smart display screen to automatically adjust the angle of the smart display screen, rotate the cleaning cotton cylinder and add cleaning liquid during the unified storage process of the smart display screen, so as to achieve the effect of automatic cleaning during the storage and removal of the smart display screen, so as to ensure the daily cleaning of the smart screen.

Description

Technical Field

[0001] The present invention relates to the field of smart screen technology, and in particular to a rail transit suspended smart screen with self-cleaning capability. Background Art

[0002] A display is a display tool that displays certain electronic files on the screen through a specific transmission device and then reflects them to the human eye. It can be divided into many types such as CRT and LCD. In order to remind passengers about train information, a certain number of smart screens are often installed in the boarding area and transfer area of ​​the subway. In order to ensure that the smart screens can be observed more and protected, they are often installed on the top of the boarding area;

[0003] In the rail transit environment, disinfection work is often carried out at night to avoid the spread of disease and ensure social safety. During the disinfection process, the disinfection device will spray onto the smart screen. The smart screen that cannot be stored is easily affected by disinfection and internal moisture. The smart screen at the top often accumulates dust on the surface during daily use, and the dust generated during the disinfection process will accumulate on the screen, affecting the observation of the smart screen. The smart screen suspended at the top is also very difficult to clean. A large number of smart screens will make the workload very huge. For this reason, a rail transit suspended smart screen with self-cleaning ability is proposed. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art and to propose a rail transit suspended smart screen with self-cleaning ability.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A rail-suspended smart screen with self-cleaning ability, comprising a support platform installed on the rail ceiling, a heat sink being provided at the bottom of the support platform, a heat dissipation mechanism being provided on the heat dissipation platform, a storage opening being opened in the support platform on both sides of the heat dissipation platform, support guide rails being provided on both sides of the inner wall of the storage opening, the support guide rails being connected with a suspension shaft through a displacement component, the suspension shaft being connected with a smart display screen through a plurality of connecting blocks, a tilting angle adjustment component acting together with the heat dissipation platform being provided on the connecting block, a cleaning shaft being provided at the bottom of the support platform at the storage opening, a cleaning cotton cylinder being fixedly connected to the outer wall of the cleaning shaft, an automatic cleaning liquid replenishing device being provided on the cleaning cotton cylinder, a self-rotating component connected with the smart display screen being provided on the cleaning shaft, a transmission chamber being provided on one side of the support platform, a plurality of the transmission chambers being commonly connected with a driving shaft controlled by a servo motor, the driving shaft being connected with a vertical rotating shaft through a cone transmission component, and the vertical rotating shaft being connected with the suspension shaft through a linkage transmission component.

[0007] Preferably, the heat dissipation mechanism includes a conical matching seat arranged at the bottom of the heat dissipation platform, a heat dissipation channel is opened on the conical matching seat, a heat dissipation fan is arranged on the inner wall of the heat dissipation channel, the heat dissipation channel is curved, and the other end is opened on the side walls of the conical matching seat, filters are arranged at both ends of the heat dissipation channel, a plurality of adsorption magnetic blocks are arranged on the conical matching seat, and a magnetic plate that is magnetically attracted to the adsorption magnetic blocks is arranged on the back of the smart display screen.

[0008] Preferably, the displacement assembly includes a climbing rack fixedly connected to the supporting guide rail, the outer side wall of the suspension shaft is fixedly connected to a climbing gear meshing with the climbing rack, and the other end of the supporting guide rail is rotatably connected to a rectangular limit block, and the rectangular limit block is adapted to the supporting guide rail.

[0009] Preferably, there are multiple connecting blocks, all of which are fixedly connected to the back side wall of the smart display screen, the suspension shaft is rotatably connected to the connecting block, the tilting angle adjustment component includes an angle adjustment gear sleeved on the suspension shaft, the angle adjustment gear is fixedly connected to the connecting block through a connecting ring sleeved on the suspension shaft, and an angle adjustment rack matched with the angle adjustment gear is fixedly connected to the side wall of the heat sink.

[0010] Preferably, the cone transmission assembly comprises a vertical bevel gear fixedly connected to the end of the vertical rotating shaft, and the driving shaft is fixedly connected to a horizontal bevel gear meshing with the vertical bevel gear.

[0011] Preferably, the linkage transmission assembly includes a limit key bar fixedly connected to the outer wall of the driving shaft, a sliding sleeve is sleeved on the driving shaft and is slidably connected to the limit key bar, a worm layer is provided on the outer wall of the sliding sleeve, one end of the suspension shaft passes through the transmission chamber and is fixedly connected to a worm wheel disk meshing with the worm layer, and a through opening for the suspension shaft to move is opened on the support guide rail.

[0012] Preferably, the automatic cleaning liquid replenishing device includes a liquid storage box arranged at the storage port, a liquid feeding cylinder is arranged in the liquid storage box, a liquid feeding piston is arranged in the liquid feeding cylinder, the liquid feeding piston is fixedly connected with a resistance column extending outward through the liquid storage box, a resistance arc block is fixedly connected with the end of the resistance column, and the resistance arc block is connected to the liquid storage box via a resistance spring sleeved on the resistance column.

[0013] Preferably, the interior of the cleaning shaft is hollow, and liquid outlet holes are evenly opened on the outer wall, and the liquid delivery cylinder is connected to the cleaning shaft through a delivery pipe.

[0014] Preferably, the self-rotating component includes a self-driving rack fixedly connected to the side wall of the smart display screen, and the end of the cleaning shaft is fixedly connected to a self-driving gear meshing with the self-driving rack.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention designs a smart screen according to the working environment of the subway. The smart display screen suspended on the top can be stored inside the support platform at night to ensure that the smart display screen will not be affected during the subway disinfection work.

[0017] 2. During the unified storage process of the smart display screen, the present invention utilizes the movement of the smart display screen to automatically adjust the angle of the smart display screen, rotates the cleaning cotton tube and adds cleaning liquid, so as to achieve the effect of automatic cleaning during the storage and removal of the smart display screen, thereby ensuring the cleaning of the smart screen every day. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the three-dimensional structure of a rail transit suspended smart screen with self-cleaning capability proposed by the present invention;

[0019] Figure 2 This is a schematic diagram of a top-view cross-sectional structure of a rail transit suspended smart screen with self-cleaning capability proposed by the present invention;

[0020] Figure 3 for Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0021] Figure 4 A side cross-sectional view of a rail transit suspended smart screen with self-cleaning capability proposed by the present invention Figure 1 ;

[0022] Figure 5 A side cross-sectional view of a rail transit suspended smart screen with self-cleaning capability proposed by the present invention Figure 2 ;

[0023] Figure 6 This is a schematic diagram of the main cross-sectional structure of a rail transit suspended smart screen with self-cleaning capability proposed by the present invention;

[0024] Figure 7 This is a schematic diagram of the internal structure of the transmission chamber in a rail transit suspended smart screen with self-cleaning capability proposed by the present invention.

[0025] In the figure: 1. Support platform; 2. Heat dissipation platform; 3. Support guide rail; 4. Suspension shaft; 5. Connection block; 6. Cleaning shaft; 7. Cleaning cotton cylinder; 8. Transmission chamber; 9. Drive shaft; 10. Vertical rotating shaft; 11. Conical matching seat; 12. Heat dissipation channel; 13. Cooling fan; 14. Adsorption magnetic block; 15. Magnetic plate; 16. Climbing rack; 17. Climbing gear; 18. Rectangular limit block; 19. Angle adjustment gear; 20. Connecting ring; 21. Angle adjustment rack; 22. Vertical bevel gear; 23. Limit key strip; 24. Sliding sleeve; 25. Worm wheel; 26. Liquid storage box; 27. Liquid delivery cylinder; 28. Liquid delivery piston; 29. ​​Resistance column; 30. Resistance arc block; 31. Liquid outlet; 32. Self-driving rack; 33. Self-driving gear; 34. Smart display screen. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] Example

[0028] Reference Figure 1-7 , a rail transit suspended smart screen with self-cleaning ability, including a support platform 1 installed on the rail transit ceiling, a heat dissipation platform 2 is arranged at the bottom of the support platform 1, and a heat dissipation mechanism is arranged on the heat dissipation platform 2. Further, the heat dissipation mechanism includes a conical matching seat 11 arranged at the bottom of the heat dissipation platform 2, a heat dissipation channel 12 is opened on the conical matching seat 11, and a heat dissipation fan 13 is arranged on the inner wall of the heat dissipation channel 12. The heat dissipation fan 13 is a prior art and will not be described in detail here. The heat dissipation channel 12 is bent, and the other end is opened on the side walls of both sides of the conical matching seat 11. Filters are arranged at both ends of the heat dissipation channel 12;

[0029] It should be noted that: in order to effectively store the smart display screen 34 and reduce the influence of gravity on the smart display screen 34, the smart display screen 34 is not provided with a heat dissipation device, and the heat dissipation is centralized through the heat dissipation mechanism provided on the heat dissipation platform 2 in the middle;

[0030] A further advantage of adopting the above is that the smart display screens 34 arranged on both sides of the bottom of the support platform 1 can dissipate heat centrally through the heat dissipation platform 2 arranged in the middle, which can reduce the space inside the smart display screen 34 and is more convenient when maintaining the heat dissipation mechanism. The independently arranged heat dissipation platform 2 has better heat dissipation performance than the heat dissipation device arranged inside the smart display screen 34, and is more suitable for heat dissipation of the smart display screen 34 in rail transit occasions that operate uninterruptedly for a long time.

[0031] A storage opening is opened in the support platform 1 located on both sides of the heat dissipation platform 2, and support guide rails 3 are arranged on both sides of the inner wall of the storage opening, wherein the support guide rail 3 is U-shaped, and the support guide rail 3 is connected to the suspension shaft 4 through a displacement component. Furthermore, the displacement component includes a climbing rack 16 fixedly connected to the support guide rail 3, and the outer wall of the suspension shaft 4 is fixedly connected to a climbing gear 17 meshing with the climbing rack 16, and the other end of the support guide rail 3 is rotatably connected to a rectangular limit block 18, and the rectangular limit block 18 is adapted to the support guide rail 3.

[0032] It should be noted that the rectangular limit block 18 is located in the U-shaped support rail 3 and is slidably connected thereto, so as to limit the up and down movement of the suspension shaft 4, ensuring that the suspension shaft 4 can only move up and down and cannot be horizontally offset, thereby ensuring the effective storage of the smart display screen 34;

[0033] The suspension shaft 4 is connected to a smart display screen 34 through a plurality of connection blocks 5. The smart display screen 34 is one of the displays based on wireless technology, which is a prior art and will not be described in detail here. The connection block 5 is provided with a tilting angle adjustment component that cooperates with the heat sink 2. Furthermore, there are a plurality of connection blocks 5, all of which are fixedly connected to the back side wall of the smart display screen 34. The suspension shaft 4 is rotatably connected to the connection block 5. Through the connection of the plurality of connection blocks 5, a reliable connection to the smart display screen 34 is ensured.

[0034] The tilting angle adjustment assembly includes an angle adjustment gear 19 sleeved on the suspension shaft 4, the angle adjustment gear 19 is fixedly connected to the connection block 5 through a connecting collar 20 sleeved on the suspension shaft 4, and an angle adjustment rack 21 adapted to the angle adjustment gear 19 is fixedly connected to the side wall of the heat dissipation platform 2;

[0035] The advantage of adopting the above method is that when the smart display screen 34 is moved downward to the end by the displacement assembly, the angle adjustment gear 19 arranged on the back of the smart display screen 34 will be in meshing contact with the angle adjustment rack 21 arranged on the heat sink 2, and the angle adjustment rack 21 will cause the angle adjustment gear 19 to drive the smart display screen 34 to rotate, so that the smart display screen 34 has an inclination angle, which satisfies the viewing of the people below.

[0036] A plurality of adsorption magnetic blocks 14 are disposed on the conical matching seat 11 , and a magnetic plate 15 that is magnetically attracted to the adsorption magnetic blocks 14 is disposed on the back of the smart display screen 34 .

[0037] By using the adsorption magnetic block 14 and the magnetic plate 15, the smart display screen 34 can be rotated by the overturning angle adjustment component. During the rotation process, the adsorption magnetic block 14 and the magnetic plate 15 will be effectively contacted, so that the heat sink 2 can achieve auxiliary support for the smart display screen 34 through magnetic force to ensure the safety of the equipment.

[0038] A cleaning shaft 6 is provided at the bottom of the support platform 1 located at the storage port, and a cleaning cotton tube 7 is fixedly connected to the outer wall of the cleaning shaft 6, and an automatic cleaning liquid replenishing device is provided on the cleaning cotton tube 7. Furthermore, the automatic cleaning liquid replenishing device includes a liquid storage box 26 arranged at the storage port, a liquid feeding tube 27 is provided in the liquid storage box 26, and a liquid feeding piston 28 is provided in the liquid feeding tube 27. The liquid feeding piston 28 is fixedly connected to a resistance column 29 extending outward through the liquid storage box 26, and a resistance arc block 30 is fixedly connected to the end of the resistance column 29. The resistance arc block 30 is connected to the liquid storage box 26 through a resistance spring sleeved on the resistance column 29. The interior of the cleaning shaft 6 is hollow, and liquid outlet holes 31 are evenly opened on the outer wall. The liquid feeding tube 27 is connected to the cleaning shaft 6 through a conveying pipe.

[0039] It is worth noting that in order to ensure that the delivery pipe can deliver the cleaning liquid when the liquid delivery piston 28 is working, a one-way valve can be provided at the delivery pipe, which can only deliver but not reflux. The two sides of the liquid delivery cylinder 27 are also provided with one-way valves for drawing the cleaning liquid into the liquid storage box 26.

[0040] The further benefit of adopting the above is that when the displacement component drives the smart display screen 34 to move, the end of the smart display screen 34 will contact the arc-shaped block 30, and the arc-shaped block 30 will move under the pressure of the smart display screen 34, and the arc-shaped block 30 will be driven to move during the movement, and the arc-shaped block 30 will be driven to move. The arc-shaped block 30 will compress the liquid delivery piston 28 to squeeze the cleaning liquid, and the cleaning liquid will be delivered to the inside of the cleaning shaft 6 through the delivery pipe, and delivered to the cleaning cotton cylinder 7 set on the cleaning shaft 6, so as to humidify the cleaning cotton cylinder 7, so that it can wipe the smart display screen 34 more effectively.

[0041] A self-rotating component connected to the smart display screen 34 is provided on the cleaning shaft 6. Furthermore, the self-rotating component includes a self-driving rack 32 fixedly connected to the side wall of the smart display screen 34, and a self-driving gear 33 meshingly connected to the self-driving rack 32 is fixedly connected to the end of the cleaning shaft 6.

[0042] A further advantage of adopting the above is that when the displacement component drives the smart display screen 34 to move, the self-driving rack 32 provided on the smart display screen 34 will mesh with the self-driving gear 33, and during the movement, the self-driving gear 33 drives the cleaning shaft 6 to rotate continuously, thereby driving the cleaning cotton cylinder 7 to rotate, thereby achieving effective cleaning of the surface of the smart display screen 34;

[0043] A transmission chamber 8 is provided on one side of the support platform 1, and multiple transmission chambers 8 are commonly connected to a driving shaft 9 controlled by a servo motor. The driving shaft 9 is connected to a vertical rotating shaft 10 through a cone transmission assembly. Furthermore, the cone transmission assembly includes a vertical bevel gear 22 fixedly connected to the end of the vertical rotating shaft 10, and a horizontal bevel gear is fixedly connected to the driving shaft 9 and meshed with the vertical bevel gear 22.

[0044] It is worth noting that the servo motor can control multiple smart display screens 34 located on an axis to open and close synchronously through the drive shaft 9, so that when controlling, one control can be achieved for multiple operations at the same time, which is convenient for the management of rail transit.

[0045] The vertical rotating shaft 10 is connected to the suspension shaft 4 through a linkage transmission assembly; further, the linkage transmission assembly includes a limit key bar 23 fixedly connected to the outer wall of the driving shaft 9, a sliding sleeve 24 slidably connected to the limit key bar 23 is sleeved on the driving shaft 9, a worm layer is arranged on the outer wall of the sliding sleeve 24, one end of the suspension shaft 4 passes through the transmission chamber 8, and is fixedly connected to a worm wheel 25 meshingly connected to the worm layer, and a through opening for the suspension shaft 4 to move is opened on the support guide rail 3;

[0046] It is worth noting that a limit key slot matching the limit key bar 23 is provided on the sliding sleeve 24. In order to reduce the friction between the limit key slot and the limit key bar 23, a rolling ball can be set on the inner side wall of the limit key slot to change the sliding friction into rolling friction.

[0047] The present invention installs the support platform 1 on the top of the waiting area. In daily use, when the subway traffic stops at night, the servo motor is used for unified control, so that the drive shaft 9 connected thereto rotates, and the vertical rotating shaft 10 is continuously rotated under the action of the vertical bevel gear 22 and the horizontal bevel gear. During the rotation, the sliding sleeve 24 arranged on the vertical rotating shaft 10 rotates, so that the worm wheel disc 25 meshing with it through the worm layer rotates, driving the suspension shaft 4 fixedly connected thereto to rotate. When the suspension shaft 4 rotates, the climbing rack 16 arranged on the support guide rail 3 causes the climbing gear 17 to move during the rotation, and the smart display screen 34 arranged on the suspension shaft 4 is driven to move;

[0048] At the beginning of the movement, the angle adjustment gear 19 is rotated under the action of the angle adjustment rack 21, thereby causing the smart display screen 34 to rotate, so that the magnetic plate 15 is separated from the adsorption magnetic block 14 and gradually moves to a vertical state, which is convenient for vertical movement and storage;

[0049] When the smart display screen 34 is driven to move upward for storage, its side wall will contact the resistance arc block 30. The pressure of the smart display screen 34 will cause the resistance arc block 30 to move. During the movement, the cleaning liquid in the liquid storage box 26 is injected into the cleaning cotton tube 7, so that the originally dry cleaning cotton tube 7 is moistened. At the same time, the self-driving rack 32 will engage with the self-driving gear 33, and during the movement, the self-driving gear 33 will drive the cleaning shaft 6 to rotate continuously, thereby driving the cleaning cotton tube 7 to rotate. The moistened and continuously rotating cleaning cotton tube 7 will effectively clean the smart display screen 34 and achieve a self-cleaning effect on the smart display screen 34.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A rail transit suspended smart screen with self-cleaning capability, comprising a support platform (1) installed on a rail transit ceiling, characterized in that: The support platform (1) is provided with a heat dissipation platform (2) at the bottom, and a heat dissipation mechanism is provided on the heat dissipation platform (2). The support platform (1) is provided with storage openings on both sides of the heat dissipation platform (2). Both sides of the inner wall of the storage opening are provided with support rails (3). The support rails (3) are connected to a suspension shaft (4) through a displacement component. The suspension shaft (4) is connected to a smart display screen (34) through a plurality of connection blocks (5). The connection blocks (5) are provided with a tilting angle adjustment component that cooperates with the heat dissipation platform (2). The support platform (1) is provided with a storage opening at the bottom. A cleaning shaft (6) is provided, and a cleaning cotton cylinder (7) is fixedly connected to the outer wall of the cleaning shaft (6), and an automatic cleaning liquid replenishing device is provided on the cleaning cotton cylinder (7). A self-rotating component connected to the smart display screen (34) is provided on the cleaning shaft (6), and a transmission chamber (8) is provided on one side of the support platform (1). A plurality of the transmission chambers (8) are commonly connected to a driving shaft (9) controlled by a servo motor, and the driving shaft (9) is connected to a vertical rotating shaft (10) through a cone transmission component, and the vertical rotating shaft (10) is connected to the suspension shaft (4) through a linkage transmission component; The automatic cleaning liquid replenishing device comprises a liquid storage box (26) arranged at the receiving port, a liquid delivery cylinder (27) is arranged in the liquid storage box (26), a liquid delivery piston (28) is arranged in the liquid delivery cylinder (27), the liquid delivery piston (28) is fixedly connected to a resistance column (29) extending outward through the liquid storage box (26), the end of the resistance column (29) is fixedly connected to a resistance arc block (30), and the resistance arc block (30) is connected to the liquid storage box (26) through a resistance spring sleeved on the resistance column (29); The interior of the cleaning shaft (6) is hollow, and liquid outlet holes (31) are evenly arranged on the outer wall; the liquid delivery cylinder (27) is connected to the cleaning shaft (6) through a delivery pipe; The self-rotating component comprises a self-driving rack (32) fixedly connected to the side wall of the smart display screen (34), and the end of the cleaning shaft (6) is fixedly connected to a self-driving gear (33) meshing with the self-driving rack (32).

2. According to claim 1, a rail transit suspended smart screen with self-cleaning ability is characterized in that: The heat dissipation mechanism comprises a conical matching seat (11) arranged at the bottom of the heat dissipation platform (2), a heat dissipation channel (12) is opened on the conical matching seat (11), a heat dissipation fan (13) is arranged on the inner wall of the heat dissipation channel (12), the heat dissipation channel (12) is arranged in a curved manner, and the other end is opened on the side walls of the conical matching seat (11), and the openings at both ends of the heat dissipation channel (12) are provided with filter screens; A plurality of adsorption magnetic blocks (14) are arranged on the conical matching seat (11), and a magnetic plate (15) magnetically attracted to the adsorption magnetic blocks (14) is arranged on the back of the smart display screen (34).

3. According to claim 1, a rail transit suspended smart screen with self-cleaning capability is characterized in that: The displacement assembly comprises a climbing rack (16) fixedly connected to the supporting guide rail (3); the outer wall of the suspension shaft (4) is fixedly connected with a climbing gear (17) meshing with the climbing rack (16); the other end of the supporting guide rail (3) is rotatably connected with a rectangular limit block (18); the rectangular limit block (18) is adapted to the supporting guide rail (3).

4. According to claim 1, a rail transit suspended smart screen with self-cleaning capability is characterized in that: There are a plurality of connecting blocks (5), all of which are fixedly connected to the back side wall of the smart display screen (34), and the suspension shaft (4) is rotatably connected to the connecting blocks (5); The tilting angle adjustment assembly comprises an angle adjustment gear (19) sleeved on the suspension shaft (4); the angle adjustment gear (19) is fixedly connected to the connection block (5) via a connection collar (20) sleeved on the suspension shaft (4); and an angle adjustment rack (21) adapted to the angle adjustment gear (19) is fixedly connected to the side wall of the heat dissipation platform (2).

5. According to claim 1, a rail transit suspended smart screen with self-cleaning capability is characterized in that: The bevel transmission assembly comprises a vertical bevel gear (22) fixedly connected to the end of the vertical rotating shaft (10), and a horizontal bevel gear meshing with the vertical bevel gear (22) is fixedly connected to the driving shaft (9).

6. The rail transit suspended smart screen with self-cleaning capability according to claim 1, characterized in that: The linkage transmission assembly comprises a limit key bar (23) fixedly connected to the outer wall of the drive shaft (9); a sliding sleeve (24) slidably connected to the limit key bar (23) is sleeved on the drive shaft (9); a worm layer is arranged on the outer wall of the sliding sleeve (24); one end of the suspension shaft (4) passes through the transmission chamber (8) and is fixedly connected to a worm wheel (25) meshing with the worm layer; and a through opening for the suspension shaft (4) to move is opened on the support guide rail (3).

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