Sliding plug door transmission mechanism for railway vehicle

Abstract

The invention relates to the technical field of sliding plug door transmission mechanisms, and discloses a sliding plug door transmission mechanism for railway vehicles, which comprises a fixing frame, a separating mechanism is arranged in the fixing frame, a connecting mechanism is arranged in the fixing frame, the separating mechanism comprises a limiting frame, and the outer surface of the limiting frame is fixedly connected with the inner wall of the fixing frame. The right side face of the limiting frame is fixedly connected with a supporting frame, the bottom face of the supporting frame is fixedly connected with the upper surface of the fixing frame, and the inner wall of the supporting frame is rotationally connected with a first threaded rod. According to the sliding plug door transmission mechanism for the railway vehicle, a lifting plate can pull a first servo motor at the bottom to ascend in the upward ascending process, the first servo motor ascends to drive a connecting gear ring on the surface to ascend at the same time, and then the connecting gear ring can slide and be separated on the surface of a driving gear; when a driving source of the sliding plug door breaks down, the driving assembly can be separated, and then follow-up emergency control work can be facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of plug-and-sliding door transmission mechanisms, and in particular to a plug-and-sliding door transmission mechanism for rail vehicles. Background Art

[0002] The plug-in door transmission mechanism refers to a series of mechanical devices used in urban rail vehicles or high-speed trains to control the opening and closing of doors. These mechanisms can ensure that the doors maintain stable and reliable performance under high-speed operation or frequent opening and closing. The plug-in door transmission mechanism usually includes motors, gears, toothed belts, lead screws, nuts and brackets, which work together to achieve the linear movement and closure of the doors. The plug-in door transmission mechanism mainly drives the doors to move precisely along the guide rails, including opening and closing. When closed, the plug-in door can fit the car body tightly to form a good sealing effect, which helps to reduce air resistance, reduce noise, and improve the energy efficiency of the vehicle. When open, the plug-in door can slide to the outside of the vehicle to facilitate passengers to get on and off the vehicle. In addition, the plug-in door transmission mechanism must have sufficient strength and stability to cope with various external forces that may be encountered during train operation, such as wind or passenger collisions.

[0003] According to announcement number CN116427814A, a plug-type sliding door transmission mechanism for rail vehicles is disclosed, including a top component and a door leaf, the top component including a protective cover, a slide, a door frame bar and a piston rod, the slide is installed inside the protective cover, the door frame bar is installed on both sides of the protective cover, the side of the door leaf is installed with a first movable connecting seat and a door connecting piece, the side of the slide is slidably installed with a door carrying frame and a C-shaped linkage piece, a linkage rod is hinged between the door connecting piece and the door carrying frame, the side of the door frame bar is hinged with a first curved arm, the piston rod is hinged on the upper side of the first curved arm, the end of the piston rod is hinged to the C-shaped linkage piece, the end of the first curved arm is rotatably installed with a first rotating shaft, and the bottom end of the first rotating shaft is rotatably connected to the first movable connecting seat.

[0004] By adopting the above technical scheme, the transmission mechanism of the Sierra door for rail vehicles, the first movable connecting seat and the second movable connecting seat have the same structure, the first movable connecting seat and the second movable connecting seat themselves are fixedly connected to the door leaf as a whole, but the connection position of the first movable connecting seat and the second movable connecting seat with the first curved arm and the second curved arm can be slightly adjusted, and the sliding position between the sliding plate and the bottom plate can be adjusted by adjusting the screw connection length between the bolt and the sliding plate. The sliding positions of the sliding plate and the bottom plate are different. When the first curved arm and the second curved arm rotate, the movement trajectory of the door leaf and the stop position after opening and closing are different. According to actual needs, by adjusting the sliding position between the sliding plate and the bottom plate in the first movable connecting seat and the second movable connecting seat, it can adapt to more usage conditions, thereby improving the flexibility of the use of the Sierra door of rail vehicles. However, in the above technical scheme, during the use of the transmission mechanism of the Sierra door, although it can quickly transmit and drive the Sierra door to open and close, the transmission mechanism itself does not have an emergency function. When the driving source of the transmission mechanism itself fails and cannot work, it will easily cause the transmission mechanism to be unable to control the opening and closing of the Sierra door, thereby greatly affecting the use of the Sierra door and also causing a certain impact on passengers. Summary of the invention

[0005] The object of the present invention is to provide a plug door transmission mechanism for rail vehicles to solve the problems raised in the above-mentioned background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: A plug sliding door transmission mechanism for a rail vehicle, comprising a fixing frame, a separation mechanism is arranged inside the fixing frame, and a connection mechanism is arranged inside the fixing frame;

[0007] The lifting block is a first piece and a second piece, and the first piece is a second piece. The first piece is a first piece and a second piece are a first piece. The first piece is a second piece and a second piece are a first piece. The first piece is a second piece and a second piece are a first piece.

[0008] The connecting mechanism includes a fixed frame, the outer surface of the fixed frame is fixedly connected to the inner wall of the fixed frame, the right side surface of the fixed frame is fixedly connected to the left side surface of the limit frame, the inner wall of the fixed frame is fixedly connected to a second servo motor, the output end of the second servo motor power is fixedly connected to a second threaded rod, the outer surface of the second threaded rod is threadedly connected to a moving frame, the outer surface of the moving frame is slidably connected to the inner wall of the fixed frame, the right side surface of the moving frame is fixedly connected to the limit frame, the outer surface of the limit frame is slidably connected to the inner wall of the fixed frame, the inner wall of the limit frame is fixedly connected to a third servo motor, and the output end of the third servo motor power is fixedly connected to a connecting gear.

[0009] Preferably, the upper surface and the bottom surface of the fixing frame are fixedly connected with two fixing blocks, and the inner wall of each fixing block is threadedly connected with a bolt.

[0010] Preferably, both side surfaces of each of the fixing blocks are fixedly connected with reinforcement blocks, and the side surfaces of each group of reinforcement blocks close to each other are fixedly connected to the upper surface and the bottom surface of the fixing frame respectively.

[0011] Preferably, two third threaded rods are arranged inside the fixing frame, and the outer surface of each of the third threaded rods is rotatably connected to the inner wall of the limiting frame.

[0012] Preferably, the ends of the two third threaded rods that are away from each other are fixedly connected to bearings, and the outer ring of each bearing is fixedly connected to the inner wall of the fixing frame.

[0013] Preferably, the outer surface of each of the third threaded rods is threadedly connected to a moving block, the outer surface of each of the moving blocks is slidably connected to the inner wall of the fixed frame, the inner walls of the two moving blocks are slidably connected to a limiting column, and both ends of the limiting column are fixedly connected to the inner wall of the fixed frame.

[0014] Preferably, the bottom surface of each of the moving blocks is fixedly connected to a driving frame, the outer surface of each of the driving frames is slidably connected to the inner wall of the fixed frame, and the inner wall of each of the driving frames is threadedly connected to two first threaded wires.

[0015] Preferably, the inner wall of the limit frame is slidably connected to a sealing door, and the inner wall of the sealing door is threadedly connected to four second threaded wires, and one end of each of the second threaded wires close to the limit frame passes through the sealing door and extends to the interior of the limit frame, and one end of each of the second threaded wires close to the limit frame is threadedly connected to the inner wall of the limit frame.

[0016] Preferably, the ends of the two third threaded rods close to each other are fixedly connected to the second bevel gears, and the outer surface of each of the second bevel gears is meshingly connected with the outer surface of the first bevel gear.

[0017] Preferably, the outer surface of the rotating shaft is rotatably connected to a limiting plate, and the outer surface of the limiting plate is fixedly connected to the inner wall of the limiting frame.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0019] First, the present invention arranges a first threaded rod, a rotating block, a lifting plate, a first servo motor, a connecting gear ring, a rotating shaft and a driving gear, so that under the action of the rotating block, the rotating block can facilitate the staff to drive the first threaded rod to rotate. During the rotation of the first threaded rod, the first threaded rod can drive the lifting plate on the surface to rise, so that the lifting plate can slide upward inside the limit frame and the support frame. At the same time, during the upward rise of the lifting plate, the first servo motor at the bottom can be pulled to rise. The rise of the first servo motor can drive the connecting gear ring on the surface to rise at the same time, and then the connecting gear ring can slide and separate on the surface of the driving gear, so that the driving component can be separated when the driving source of the sliding door fails, which is convenient for subsequent emergency control work.

[0020] Second, the present invention sets a fixed frame, a second servo motor, a second threaded rod, a movable frame, a limit frame, a third servo motor and a connecting gear, so that under the action of the second servo motor, the second servo motor can generate power rotation after being turned on, and the rotation of the second servo motor can drive the second threaded rod on the surface to rotate. Under the action of the rotation of the second threaded rod, the movable frame on the driving surface is moved, and the movable frame can apply thrust to the limit frame when moving. Therefore, under the action of the thrust, the limit frame can drive the third servo motor and the connecting gear to move until the teeth of the connecting gear can enter the interior of the tooth groove of the driving gear, thereby facilitating the emergency opening and closing of the sliding door and avoiding the situation where the sliding door cannot work when the driving source fails. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the fixing frame of the present invention;

[0022] Figure 2 It is a schematic diagram of the three-dimensional structure of the limiting frame of the present invention;

[0023] Figure 3 It is a schematic diagram of the three-dimensional structure of the cross-section of the fixing frame of the present invention;

[0024] Figure 4 It is a schematic diagram of the three-dimensional structure of the support frame of the present invention in a right-side cross-sectional view;

[0025] Figure 5 It is a schematic diagram of a three-dimensional structure of a cross-section of a support frame of the present invention;

[0026] Figure 6It is a three-dimensional structural schematic diagram of a cross-section of the fixing frame of the present invention.

[0027] Wherein: 1. fixed frame; 2. separation mechanism; 201. limit frame; 202. support frame; 203. first threaded rod; 204. rotating block; 205. lifting plate; 206. first servo motor; 207. connecting gear ring; 208. rotating shaft; 209. driving gear; 210. first bevel gear; 3. connecting mechanism; 301. fixed frame; 302. second servo motor; 303. second threaded rod; 304. moving frame; 305. limit frame; 306. third servo motor; 307. connecting gear; 4. fixed block; 5. bolt; 6. reinforcement block; 7. moving block; 8. limit column; 9. third threaded rod; 10. bearing; 11. driving frame; 12. first threaded wire; 13. sealing door; 14. second threaded wire; 15. limit plate; 16. second bevel gear. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Embodiment 1

[0030] See also Figure 1-6 , a plug door transmission mechanism for a rail vehicle, comprising a fixing frame 1, a separation mechanism 2 is arranged inside the fixing frame 1, and a connection mechanism 3 is arranged inside the fixing frame 1;

[0031] The separation mechanism 2 includes a limit frame 201, the outer surface of the limit frame 201 is fixedly connected to the inner wall of the fixing frame 1, the right side of the limit frame 201 is fixedly connected to the support frame 202, the bottom surface of the support frame 202 is fixedly connected to the upper surface of the fixing frame 1, the inner wall of the support frame 202 is rotatably connected to the first threaded rod 203, the top of the first threaded rod 203 is fixedly connected to the rotating block 204, the outer surface of the first threaded rod 203 is threadedly connected to the lifting plate 205, and the outer surface of the lifting plate 205 slides with the inner wall of the support frame 202 The outer surface of the lifting plate 205 is slidably connected to the inner wall of the limit frame 201, the bottom surface of the lifting plate 205 is fixedly connected to the first servo motor 206, the output end of the power of the first servo motor 206 is fixedly connected to the connecting gear ring 207, the interior of the limit frame 201 is provided with a first bevel gear 210, the inner wall of the first bevel gear 210 is fixedly connected to the rotating shaft 208, the outer surface of the rotating shaft 208 is fixedly connected to the driving gear 209, and the outer surface of the driving gear 209 is slidably connected to the inner wall of the connecting gear ring 207.

[0032] The upper surface and the bottom surface of the fixing frame 1 are fixedly connected with two fixing blocks 4, and the inner wall of each fixing block 4 is threadedly connected with a bolt 5. By setting the fixing blocks 4 and the bolts 5, the whole device can be conveniently fixed firmly to avoid movement during use.

[0033] Both side surfaces of each fixing block 4 are fixedly connected with reinforcement blocks 6, and the side surfaces of each group of reinforcement blocks 6 close to each other are respectively fixedly connected to the upper surface and the bottom surface of the fixing frame 1. By setting the reinforcement blocks 6, the connection effect of the fixing blocks 4 can be further increased, so that it can be used more stably.

[0034] Two third threaded rods 9 are arranged inside the fixed frame 1, and the outer surface of each third threaded rod 9 is rotatably connected to the inner wall of the limit frame 201. By setting the third threaded rod 9, the moving block 7 can be conveniently driven to move, so that it can assist in quickly completing the opening and closing of the sliding door.

[0035] The ends of the two third threaded rods 9 that are away from each other are fixedly connected with bearings 10, and the outer ring of each bearing 10 is fixedly connected to the inner wall of the fixed frame 1. By setting the bearings 10, a good support effect can be provided for the third threaded rods 9, and at the same time, excessive friction can be avoided during rotation.

[0036] The outer surface of each third threaded rod 9 is threadedly connected to a moving block 7, and the outer surface of each moving block 7 is slidably connected to the inner wall of the fixed frame 1. The inner walls of the two moving blocks 7 are slidably connected to the limiting column 8, and both ends of the limiting column 8 are fixedly connected to the inner wall of the fixed frame 1. By setting the moving block 7 and the limiting column 8, the moving block 7 can conveniently drive the components below to move, and at the same time, the limiting column 8 can further increase the limiting effect of the moving block 7 when it moves.

[0037] The specific implementation of this embodiment is as follows: first, when the transmission mechanism of the Sierra door fails, the staff manually rotates the first threaded rod 203 by means of the rotating block 204. During the rotation of the first threaded rod 203, the first threaded rod 203 can drive the lifting plate 205 on the surface to rise, so that the lifting plate 205 can slide upward inside the limit frame 201 and the support frame 202. At the same time, during the upward rise of the lifting plate 205, the first servo motor 206 at the bottom can be pulled up. Subsequently, the rise of the first servo motor 206 can drive the surface connecting gear ring 207 to rise at the same time. Finally, the connecting gear ring 207 can slide and separate on the surface of the driving gear 209, which can facilitate subsequent emergency control work.

[0038] Embodiment 2

[0039] See also Figure 1-6The connecting mechanism 3 includes a fixed frame 301, the outer surface of the fixed frame 301 is fixedly connected to the inner wall of the fixed frame 1, the right side of the fixed frame 301 is fixedly connected to the left side of the limit frame 201, the inner wall of the fixed frame 301 is fixedly connected with a second servo motor 302, the output end of the power of the second servo motor 302 is fixedly connected with a second threaded rod 303, the outer surface of the second threaded rod 303 is threadedly connected with a moving frame 304, the outer surface of the moving frame 304 is slidably connected to the inner wall of the fixed frame 301, the right side of the moving frame 304 is fixedly connected with a limit frame 305, the outer surface of the limit frame 305 is slidably connected to the inner wall of the fixed frame 301, the inner wall of the limit frame 305 is fixedly connected with a third servo motor 306, and the output end of the power of the third servo motor 306 is fixedly connected with a connecting gear 307.

[0040] The bottom surface of each moving block 7 is fixedly connected to a driving frame 11, the outer surface of each driving frame 11 is slidably connected to the inner wall of the fixed frame 1, and the inner wall of each driving frame 11 is threadedly connected to two first threaded wires 12. By setting the driving frame 11 and the first threaded wires 12, it can be conveniently connected to the components of the Sierra door, and then the Sierra door can be driven to move through the driving frame 11 and the components of the Sierra door.

[0041] The inner wall of the limit frame 201 is slidably connected to a sealing door 13, and the inner wall of the sealing door 13 is threadedly connected to four second threaded wires 14, and one end of each second threaded wire 14 close to the limit frame 201 passes through the sealing door 13 and extends to the interior of the limit frame 201, and one end of each second threaded wire 14 close to the limit frame 201 is threadedly connected to the inner wall of the limit frame 201. By providing the sealing door 13 and the second threaded wire 14, the limit frame 201 can be opened easily, and the internal driving source can be easily checked and repaired.

[0042] The ends of the two third threaded rods 9 that are close to each other are fixedly connected with the second bevel gear 16, and the outer surface of each second bevel gear 16 is meshed with the outer surface of the first bevel gear 210. By setting the second bevel gear 16, power can be easily transmitted to the internal third threaded rod 9, thereby realizing power transmission.

[0043] The outer surface of the rotating shaft 208 is rotatably connected to the limiting plate 15, and the outer surface of the limiting plate 15 is fixedly connected to the inner wall of the limiting frame 201. By setting the limiting plate 15, the supporting and limiting effect of the rotating shaft 208 can be increased, so that it can be used stably.

[0044] The specific implementation method of this embodiment is as follows: first, the staff turns on the power of the second servo motor 302 and the third servo motor 306. When the connecting gear ring 207 is separated from the driving gear 209, the staff turns on the second servo motor 302. After the second servo motor 302 is turned on, it can generate power rotation. The rotation of the second servo motor 302 can drive the second threaded rod 303 on the surface to rotate. Under the action of the rotation of the second threaded rod 303, the moving frame 304 of the driving surface is moved. When the moving frame 304 moves, it can apply a thrust to the limit frame 305. Therefore, under the action of the thrust, the limit frame 305 can drive the third servo motor 306 and the connecting gear 307 to move until the teeth of the connecting gear 307 can enter the tooth groove of the driving gear 209. Finally, the third servo motor 306 is turned on. After the third servo motor 306 is turned on, it can drive the connecting gear 307 to rotate. The connecting gear 307 can drive the driving gear 209 and the rotating shaft 208 to rotate, thereby facilitating the emergency opening and closing of the sliding door.

[0045] The working principle of the present invention is as follows: first, the staff turns on the power of the first servo motor 206, the second servo motor 302 and the third servo motor 306, and then the staff firmly fixes the device with the bolt 5, and fixes it with the connecting component of the plug door through the first threaded wire 12 below, and then the first servo motor 206 can be turned on, and the first servo motor 206 can drive the connecting gear ring 207 to rotate, and when the connecting gear ring 207 rotates, it can drive the driving gear 209, the rotating shaft 208 and the first bevel gear 210 to rotate, and then the first bevel gear 210 can drive The second bevel gear 16 and the third threaded rod 9 are driven to rotate, and finally the lower components and the plug door can be driven to open and close through the moving block 7. When the transmission mechanism of the plug door fails, the staff manually rotates the first threaded rod 203 through the rotating block 204 to rotate. During the rotation of the first threaded rod 203, the first threaded rod 203 can drive the lifting plate 205 on the surface to rise, so that the lifting plate 205 can slide upward inside the limit frame 201 and the support frame 202. At the same time, during the upward rise of the lifting plate 205, the first servo motor at the bottom can be pulled The motor 206 rises, and then the first servo motor 206 rises to drive the surface connection gear ring 207 to rise at the same time, and finally the connection gear ring 207 can slide and separate on the surface of the driving gear 209. After the connection gear ring 207 is separated from the driving gear 209, the staff turns on the second servo motor 302. After the second servo motor 302 is turned on, it can generate power to rotate. The rotation of the second servo motor 302 can drive the second threaded rod 303 on the surface to rotate. Under the action of the rotation of the second threaded rod 303, the moving frame of the driving surface is driven. 304 moves, and the moving frame 304 can apply a thrust to the limiting frame 305 when moving, so that under the action of the thrust, the limiting frame 305 can drive the third servo motor 306 and the connecting gear 307 to move, until the teeth of the connecting gear 307 can enter the interior of the tooth groove of the driving gear 209, and finally turn on the third servo motor 306. After the third servo motor 306 is turned on, it can drive the connecting gear 307 to rotate, and the connecting gear 307 can drive the driving gear 209 and the rotating shaft 208 to rotate, thereby facilitating the emergency opening and closing of the sliding door.

[0046] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0047] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A plug door transmission mechanism for a rail vehicle, comprising a fixing frame (1), characterized in that: A separation mechanism (2) is provided inside the fixing frame (1), and a connection mechanism (3) is provided inside the fixing frame (1); The separation mechanism (2) comprises a limit frame (201), the outer surface of the limit frame (201) is fixedly connected to the inner wall of the fixing frame (1), the right side of the limit frame (201) is fixedly connected to a support frame (202), the bottom surface of the support frame (202) is fixedly connected to the upper surface of the fixing frame (1), the inner wall of the support frame (202) is rotatably connected to a first threaded rod (203), the top end of the first threaded rod (203) is fixedly connected to a rotating block (204), the outer surface of the first threaded rod (203) is threadedly connected to a lifting plate (205), the outer surface of the lifting plate (205) is rotatably connected to the inner wall of the support frame (202), The lifting plate (205) is slidably connected to the inner wall of the limiting frame (201), the outer surface of the lifting plate (205) is slidably connected to the inner wall of the limiting frame (201), the bottom surface of the lifting plate (205) is fixedly connected to a first servo motor (206), the output end of the power of the first servo motor (206) is fixedly connected to a connecting gear ring (207), a first bevel gear (210) is arranged inside the limiting frame (201), the inner wall of the first bevel gear (210) is fixedly connected to a rotating shaft (208), the outer surface of the rotating shaft (208) is fixedly connected to a driving gear (209), and the outer surface of the driving gear (209) is slidably connected to the inner wall of the connecting gear ring (207); The connecting mechanism (3) comprises a fixing frame (301), the outer surface of the fixing frame (301) is fixedly connected to the inner wall of the fixing frame (1), the right side of the fixing frame (301) is fixedly connected to the left side of the limiting frame (201), the inner wall of the fixing frame (301) is fixedly connected to a second servo motor (302), the output end of the power of the second servo motor (302) is fixedly connected to a second threaded rod (303), and the outer surface of the second threaded rod (303) is threadedly connected to A movable frame (304) is connected, the outer surface of the movable frame (304) is slidably connected to the inner wall of the fixed frame (301), the right side surface of the movable frame (304) is fixedly connected to a limiting frame (305), the outer surface of the limiting frame (305) is slidably connected to the inner wall of the fixed frame (301), the inner wall of the limiting frame (305) is fixedly connected to a third servo motor (306), and the output end of the power of the third servo motor (306) is fixedly connected to a connecting gear (307).

2. A plug-sliding door transmission mechanism for a rail vehicle according to claim 1, characterized in that: Two fixing blocks (4) are fixedly connected to the upper surface and the bottom surface of the fixing frame (1), and the inner wall of each fixing block (4) is threadedly connected to a bolt (5).

3. A plug-sliding door transmission mechanism for a rail vehicle according to claim 2, characterized in that: Both side surfaces of each of the fixing blocks (4) are fixedly connected to reinforcement blocks (6), and the side surfaces of each group of reinforcement blocks (6) that are close to each other are respectively fixedly connected to the upper surface and the bottom surface of the fixing frame (1).

4. A plug-sliding door transmission mechanism for a rail vehicle according to claim 1, characterized in that: Two third threaded rods (9) are arranged inside the fixing frame (1), and the outer surface of each of the third threaded rods (9) is rotatably connected to the inner wall of the limiting frame (201).

5. A plug-sliding door transmission mechanism for a rail vehicle according to claim 4, characterized in that: The ends of the two third threaded rods (9) that are away from each other are fixedly connected to bearings (10), and the outer ring of each bearing (10) is fixedly connected to the inner wall of the fixing frame (1).

6. A plug-sliding door transmission mechanism for a rail vehicle according to claim 4, characterized in that: The outer surface of each of the third threaded rods (9) is threadedly connected to a moving block (7), the outer surface of each of the moving blocks (7) is slidably connected to the inner wall of the fixed frame (1), the inner walls of the two moving blocks (7) are slidably connected to a limiting column (8), and both ends of the limiting column (8) are fixedly connected to the inner wall of the fixed frame (1).

7. A plug door transmission mechanism for a rail vehicle according to claim 6, characterized in that: The bottom surface of each moving block (7) is fixedly connected to a driving frame (11), the outer surface of each driving frame (11) is slidably connected to the inner wall of the fixed frame (1), and the inner wall of each driving frame (11) is threadedly connected to two first threaded wires (12).

8. The plug door transmission mechanism for rail vehicles according to claim 1, characterized in that: The inner wall of the limit frame (201) is slidably connected to a sealing door (13), and the inner wall of the sealing door (13) is threadedly connected to four second threaded wires (14), and one end of each of the second threaded wires (14) close to the limit frame (201) passes through the sealing door (13) and extends to the interior of the limit frame (201), and one end of each of the second threaded wires (14) close to the limit frame (201) is threadedly connected to the inner wall of the limit frame (201).

9. A plug door transmission mechanism for a rail vehicle according to claim 4, characterized in that: The ends of the two third threaded rods (9) that are close to each other are fixedly connected to a second bevel gear (16), and the outer surface of each second bevel gear (16) is meshedly connected to the outer surface of the first bevel gear (210).

10. A plug door transmission mechanism for a rail vehicle according to claim 1, characterized in that: The outer surface of the rotating shaft (208) is rotatably connected to the limiting plate (15), and the outer surface of the limiting plate (15) is fixedly connected to the inner wall of the limiting frame (201).

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