CN111794099A

CN111794099A - Bogie replacing system

Info

Publication number: CN111794099A
Application number: CN202010725879.1A
Authority: CN
Inventors: 黎莎; 石磊
Original assignee: Beijing Railway Institute of Mechanical and Electrical Engineering Group Co Ltd
Current assignee: Beijing Railway Institute of Mechanical and Electrical Engineering Group Co Ltd
Priority date: 2020-07-24
Filing date: 2020-07-24
Publication date: 2020-10-20

Abstract

The invention relates to the field of motor train unit overhauling equipment and discloses a bogie replacing system. The bogie replacing system comprises an underground passage and a transporting device arranged in the underground passage, the transporting device comprises a walking component, a supporting component and a lifting component, the walking component is movably arranged in the underground passage, the supporting component is arranged on the walking component in a height-adjustable mode and used for supporting a bogie to be replaced, and the lifting component is arranged between the walking component and the supporting component and used for adjusting the height of the supporting component. The bogie replacement system provided by the invention can realize the quick replacement of the bogie of the motor train unit in the inspection warehouse, has wide application range and low modification cost, does not influence other inspection operations in the inspection warehouse, improves the maintenance efficiency of the motor train unit, and ensures the normal driving of the motor train unit.

Description

Bogie replacing system

Technical Field

The invention relates to the field of motor train unit overhauling equipment, in particular to a bogie replacing system.

Background

After the motor train unit finishes the operation task, the motor train unit needs to return to the inspection library for daily maintenance. Because the inspection storeroom lacks the special equipment for disassembling and maintaining the motor train unit bogie, when the maintainers find that the bogie breaks down, the motor train unit needs to be wholly transferred to the three-level inspection storeroom or the temporary repair storeroom for maintenance.

However, the investment cost of the three-level overhaul warehouse and the temporary overhaul warehouse is too high, and large-scale construction is not easy. Therefore, the inspection banks in some places are not provided with the tertiary overhaul banks or the temporary overhaul banks, resulting in difficulty in overhauling the failed bogie. Generally, a pit type car lifting jack or a movable car lifting jack is used for disassembling the bogie in the three-level overhaul warehouse, but the equipment has the disadvantages of complex structure, large occupied area of the field, high investment cost and unsuitability for configuration in the overhaul warehouse. The car body is usually lifted to a certain height for disassembling the bogie, and the car body is lifted in the inspection warehouse to interfere with a high-pressure contact net at the top of the inspection warehouse, so that the car body is not suitable to be lifted in the inspection warehouse. If the gantry type supporting device of the temporary repair warehouse is configured in the inspection warehouse, the gantry type supporting device needs to be installed on the side surface of the track bridge, so that channels on two sides of the track bridge are occupied, and other inspection operations of the inspection warehouse can be influenced.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a bogie replacement system capable of replacing a bogie in an inspection room without affecting other inspection operations.

In order to achieve the purpose, the invention adopts the following technical scheme:

a truck changing system comprising an underground passageway and a conveyor disposed within the underground passageway, the conveyor comprising:

the walking assembly is movably arranged in the underground passage;

the supporting assembly is arranged on the walking assembly in a height adjustable mode and used for supporting the bogie to be replaced;

and the lifting assembly is arranged between the walking assembly and the supporting assembly and is used for adjusting the height of the supporting assembly.

As a preferable scheme of the bogie replacement system of the present invention, the transportation device further includes a rotating assembly, and the rotating assembly is disposed between the lifting assembly and the traveling assembly, and is configured to rotate the bogie to be replaced to a preset posture.

As a preferable aspect of the bogie exchanging system of the present invention, the rotating assembly includes a turntable, the traveling assembly includes a base plate, the turntable is rotatably disposed on the base plate, and the lifting assembly is disposed on the turntable.

As a preferable aspect of the bogie exchanging system of the present invention, the turntable is rotatably connected to the base plate through a rotating shaft, and the rotating shaft is mounted on the base plate through a bearing.

As a preferred scheme of the bogie replacement system of the present invention, the turntable is provided with a plurality of pins, the plurality of pins are distributed at intervals along the circumferential direction of the turntable, and the bottom plate is provided with a rotatable toothed disc capable of shifting the pins to rotate the turntable.

As a preferable scheme of the bogie exchanging system of the present invention, the lifting assembly is a scissor type lifting mechanism, a fixed end of the scissor type lifting mechanism is disposed on the turntable, and an output end of the scissor type lifting mechanism is connected to the support assembly.

As a preferable scheme of the bogie replacement system of the present invention, the running assembly further includes running wheels, the running wheels are disposed on the bottom plate, the underground passage is provided with running rails, and the running wheels can slide on the running rails to transport the bogie to be replaced.

As a preferable scheme of the bogie exchanging system of the present invention, the support assembly includes a support beam and a locking device, the support beam is provided with a positioning hole, the locking device is provided on the track bridge, the locking device includes a driving mechanism and a connecting shaft, and the driving mechanism can drive the connecting shaft to be inserted into the positioning hole to lock the support beam and the track bridge.

As a preferable scheme of the bogie replacement system of the present invention, the driving mechanism includes a sleeve, a first rod, a second rod, and a driving rod, the sleeve is disposed on the track bridge, the connecting shaft is slidably disposed in the sleeve, the first rod and the second rod are disposed at an included angle, one end of the first rod is rotatably connected to the connecting shaft, the other end of the first rod is rotatably connected to one end of the second rod, the other end of the second rod is rotatably connected to the driving rod, a limiting groove is disposed on the track bridge along the height direction, a rotation connecting end of the first rod and the second rod is slidably disposed in the limiting groove, and the driving rod can pull the second rod to push the first rod, so as to drive the connecting shaft to be inserted into the positioning hole.

As a preferable scheme of the bogie replacement system of the present invention, the underground passage includes a passage entrance, the track bridge is provided with an avoidance fracture, and the passage entrance is disposed below the avoidance fracture.

The invention has the beneficial effects that:

the bogie replacing system provided by the invention can be used for replacing the bogie of the motor train unit in the inspection warehouse, when the motor train unit drives into the rail bridge of the inspection warehouse, the bogie to be replaced is stopped at the avoiding fracture of the rail bridge, the bogie to be replaced is supported by the supporting assembly, an operator disassembles the bogie to be replaced from the motor train unit body, the height of the supporting assembly is adjusted by the lifting assembly, so that the bogie is descended into the underground passage, the bogie to be replaced slides in the underground passage by the walking assembly, is conveyed to the bogie maintenance warehouse for maintenance (or replacement of a new bogie), and finally, the original path of the maintained bogie (or the new bogie) is returned and installed on the motor train unit body. The bogie replacement system provided by the invention can realize the quick replacement of the bogie of the motor train unit in the inspection warehouse, has wide application range and low modification cost, does not influence other inspection operations in the inspection warehouse, improves the maintenance efficiency of the motor train unit, and ensures the normal driving of the motor train unit.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

FIG. 1 is a schematic view of a truck conversion system according to an embodiment of the present invention from a first perspective;

FIG. 2 is a schematic view of a truck conversion system according to an embodiment of the present invention from a second perspective;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a schematic illustration of the lift assembly in a truck conversion system configured to bottom out in accordance with an embodiment of the present invention;

FIG. 5 is a schematic view of a truck conversion system according to an embodiment of the present invention from a third perspective;

fig. 6 is a partially enlarged view at B in fig. 2.

In the figure:

1-underground passage; 2-a transportation device;

11-channel entrance; 12-channel outlet; 13-running track;

21-a support assembly; 22-a lifting assembly; 23-a rotating assembly; 24-a running assembly;

211-locking means; 212-a support beam; 2121-positioning holes;

2111-connecting shaft; 2112-a drive mechanism;

21121-sleeve; 21122-first rod; 21123-second rod; 21124-drive rod;

221-scissor lift mechanism; 222-a hydraulic cylinder;

231-a turntable; 2311-a pin roll; 2312-rotating shaft;

241-a bottom plate; 2411-a bearing; 242-running wheels; 243-fluted disc; 244 — a first reducer; 245-second

A speed reducer;

100-motor train unit; 200-hydraulic support columns; 300-a bogie; 400-track bridge; 401-avoiding fracture;

402-a limiting groove; 500-truck garage rail.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 and 2, the present embodiment provides a bogie replacement system that can be used to replace a bogie 300 of a motor train unit 100 in an inspection garage. The bogie exchanging system comprises an underground passage 1 and a conveying device 2 arranged in the underground passage 1. Conveyor 2 includes, among other things, a running assembly 24, a support assembly 21, and a lift assembly 22. The running component 24 is movably arranged in the underground passage 1, the supporting component 21 is arranged on the running component 24 in a height-adjustable mode and used for supporting the bogie 300 to be replaced, and the lifting component 22 is arranged between the running component 24 and the supporting component 21 and used for adjusting the height of the supporting component 21.

In order to avoid influencing other overhaul operations in the inspection warehouse, optionally, an avoidance fracture 401 is arranged on the track bridge 400, the support assembly 21 comprises a support beam 212, the support beam 212 can be lifted to a position flush with the avoidance fracture 401 to fill the avoidance fracture 401, the motor train unit 100 can be further pulled to the avoidance fracture 401 of the track bridge 400, and the bogie 300 to be replaced is stopped at the avoidance fracture 401 of the track bridge 400. A channel inlet 11 is dug on the ground below the avoidance fracture 401, and the channel inlet 11 is communicated with the underground channel 1. The underpass 1 further comprises an access exit 12, the access exit 12 being connected to the bogie garage track 500 for transporting a bogie 300 to be replaced through the underpass 1 to the bogie garage for repair or replacement.

After the motor train unit 100 drives into the inspection warehouse, when workers inspect and find that a certain bogie 300 has a fault, the motor train unit 100 is pulled to the avoidance fracture 401 of the track bridge 400, the bogie 300 to be replaced is stopped at the avoidance fracture 401 of the track bridge 400, the bogie 300 to be replaced is supported through the supporting beam 212, an operator disassembles the bogie 300 to be replaced from the motor train unit 100, and then supports the motor train body to the train erecting position through the two hydraulic supporting columns 200, so that the bogie 300 does not bear the weight of the motor train body, the height of the supporting beam 212 is adjusted through the lifting assembly 22, and the bogie 300 is descended into the underground passage 1. Then, the running assembly 24 slides in the underground passage 1, the bogie 300 to be replaced is conveyed to a bogie maintenance warehouse for maintenance (or replacement of a new bogie), and finally, the maintained bogie 300 (or the new bogie) is returned in the original way and is installed on the train body of the motor train unit 100. The bogie replacement system provided by the embodiment can realize the quick replacement of the bogie 300 of the motor train unit 100 in the inspection warehouse, is wide in application range and low in modification cost, does not influence other inspection operations in the inspection warehouse, improves the maintenance efficiency of the motor train unit 100, and ensures the normal driving of the motor train unit 100.

In this embodiment, in order to facilitate the motor train unit 100 to pass through the avoidance fracture 401 of the track bridge 400, the supporting beam 212 may be locked and fixed with the track bridge 400 on two sides of the avoidance fracture 401, optionally, the supporting assembly 21 further includes a locking device 211, the supporting beam 212 is provided with a positioning hole 2121, the locking device 211 is disposed on the track bridge 400, the locking device 211 includes a driving mechanism 2112 and a connecting shaft 2111, and the driving mechanism 2112 can drive the connecting shaft 2111 to be inserted into the positioning hole 2121, so as to lock the supporting beam 212 and the track bridge 400. The two locking devices 211 are respectively arranged on the track bridges 400 on the two sides of the avoidance fracture 401, correspondingly, the positioning holes 2121 are respectively arranged on the two sides of the supporting beam 212, and the supporting beam 212 is simultaneously locked and fixed with the track bridges 400 on the two sides through the two locking devices 211, so that the bearing capacity of the supporting beam 212 is improved.

To facilitate the extension of the connection shaft 2111, as shown in fig. 3, the driving mechanism 2112 optionally includes a sleeve 21121, a first rod 21122, a second rod 21123 and a driving rod 21124, the sleeve 21121 is disposed on the track bridge 400, and the connection shaft 2111 always slides along the axial direction of the sleeve 21121, so as to ensure that the connection shaft 2111 can be horizontally inserted into the positioning hole 2121 of the support beam 212. The first bar 21122 and the second bar 21123 are arranged at an included angle, one end of the first bar 21122 is rotatably connected with the connecting shaft 2111, the other end of the first bar 21122 is rotatably connected with one end of the second bar 21123, the other end of the second bar 21123 is rotatably connected with the driving rod 21124, the track bridge 400 is provided with a limiting groove 402 along the height direction, the rotating connecting end of the first bar 21122 and the second bar 21123 is slidably arranged in the limiting groove 402, the driving rod 21124 can pull the second bar 21123 to push the first bar 21122, and further the connecting shaft 2111 is driven to be inserted into the positioning hole 2121.

In this embodiment, in order to adjust the height of the supporting beam 212, the lifting assembly 22 may be a scissor lift 221 in the prior art, the fixed end of the scissor lift 221 is disposed on the turntable 231, and the output end of the scissor lift 221 is connected to the supporting beam 212. When the connection shaft 2111 is withdrawn from the positioning hole 2121 of the support beam 212, the connection between the support beam 212 and the track bridge 400 is unlocked, and the support beam 212 and the bogie 300 are lowered to the position of fig. 4 by the scissor lift mechanism 221.

The power source for scissor lift 221 may be a hydraulic drive system that includes a hydraulic station, hydraulic cylinders 222, control valves, and piping. The hydraulic station is connected to the hydraulic cylinder 222 via a line and a control valve for adjusting the pressure of the hydraulic cylinder 222. The power source of the scissor lift mechanism 221 is not limited to the hydraulic drive system in the present embodiment as long as the lift assembly 22 can be driven to achieve height adjustment of the support beam 212, and for example, the power source of the scissor lift mechanism 221 may be an electric drive or a pneumatic drive.

Optionally, the transportation device 2 further includes a rotating assembly 23, and the rotating assembly 23 is disposed between the lifting assembly 22 and the walking assembly 24, and is used for rotating the bogie 300 to be replaced to a preset posture. In this embodiment, as shown in fig. 5, the track bridge 400 is in a perpendicular relationship to the truck garage track 500 and there may be multiple inspection lines in the inspection garage. In order to make the truck 300 to be replaced just match the truck garage rail 500 when reaching the position of the aisle exit 12, the truck 300 to be replaced is optionally rotated by 90 degrees when the lifting assembly 22 is lowered to the lowest position, but is not limited to 90 degrees in the present embodiment, and may be rotated by a preset angle in other embodiments according to actual conditions.

Alternatively, as shown in fig. 6, the rotating assembly 23 includes a rotating plate 231, the traveling assembly 24 includes a base plate 241, the rotating plate 231 is rotatably disposed on the base plate 241, and the lifting assembly 22 is disposed on the rotating plate 231. When the turntable 231 rotates on the base plate 241, the lifting assembly 22, the supporting beam 212 and the bogie 300 are driven to rotate together, so as to rotate the bogie 300 to a preset posture. In order to make the turntable 231 more easily rotate relative to the base plate 241, optionally, one end of the rotating shaft 2312 is fixedly connected to the turntable 231, the other end of the rotating shaft 2312 is rotatably connected to the base plate 241 through a bearing 2411, a boss is arranged on the base plate 241, a groove is formed on the boss, and the bearing 2411 is installed in the groove. The bearing 2411 is not limited to a self-aligning roller bearing, and may be selected for easy rotation. Further, since the length of the bogie 300 in the longitudinal direction (traveling direction) is longer than the width of the bogie 300 in the lateral direction (perpendicular to the traveling direction), the bogie 300 can more easily pass through the underground passage 1 after rotating the bogie 300 lowered below the passage entrance 11 by 90 degrees, and the excavated cross-sectional area of the underground passage 1 can be reduced, thereby reducing the construction cost of the underground passage 1.

In order to rotate the turntable 231 by an angle of 90 degrees, optionally, a plurality of pins 2311 are disposed on the turntable 231, that is, a plurality of pins 2311 are disposed at the bottom of the turntable 231 at equal intervals along the circumferential direction of the turntable 231, a first speed reducer 244 and a toothed disc 243 are disposed on the bottom plate 241, the toothed disc 243 is driven by the first speed reducer 244, and then the toothed disc 243 shifts the pins 2311 to rotate the turntable 231 by an angle of 90 degrees. Wherein, when the lifting assembly 22 is lowered to the bottom point, the turntable 231 starts to rotate.

In this embodiment, to facilitate transportation of the bogie 300 to be replaced, optionally, the running assembly 24 further comprises running wheels 242, the running wheels 242 are arranged on the bottom plate 241, the underground passage 1 is provided with running rails 13, and the running wheels 242 can slide on the running rails 13 by being driven by a second speed reducer 245 arranged on the bottom plate 241 so as to transport the bogie 300 to be replaced. When the turntable 231 and the bogie 300 rotate by 90 degrees, the running wheels 242 start to slide on the running rails 13, and the bogie 300 to be replaced is transported to the passage outlet 12. In order to ensure that the traveling wheels 242 can stop moving at a designated position, optionally, a magnetic induction switch is installed on the bottom plate 241, and positioning iron sheets are provided at the position of the passageway entrance 11 and the passageway exit 12 of the underground passageway 1, and when the magnetic induction switch reaches the position of the positioning iron sheets, a sensing signal can be generated, so that the traveling wheels 242 stop moving. When the bogie 300 reaches the exit 12 of the passage, the bogie 300 is lifted onto the bogie garage rail 500 again by the scissor lift mechanism 221, the bogie 300 is transferred to the bogie garage along the bogie garage rail 500, the operator repairs the bogie 300 or replaces a new bogie, and then the repaired bogie or a new bogie is returned to be installed on the train unit 100.

The bogie replacement system provided by the embodiment roughly comprises the following working processes: after the motor train unit 100 drives into the inspection warehouse, the conveying device 2 is located below the channel entrance 11 of the underground channel 1, at the moment, the lifting assembly 22 lifts the supporting beam 212, the supporting beam 212 fills the avoidance fracture 401 of the track bridge 400 and is flush with the track bridges 400 on the two sides, and meanwhile, the locking device 211 locks and fixes the supporting beam 212 and the track bridges 400 on the two sides, so that the motor train unit 100 can pass through the supporting beam 212 on the avoidance fracture 401 of the track bridge 400; when an operator checks and finds that a certain bogie 300 of the motor train unit 100 is in fault, the motor train unit 100 is pulled, the bogie 300 to be replaced is stopped at an avoidance fracture 401 of the track bridge 400, the bogie 300 to be replaced is supported by the supporting beam 212, the operator disassembles the bogie 300 to be replaced from the motor train unit 100, and then supports the motor train unit by the two hydraulic supporting columns 200, so that the bogie 300 does not bear the weight of the motor train unit, the connection between the supporting beam and the track bridge is unlocked, the height of the supporting beam 212 is adjusted by the lifting assembly 22, and the bogie 300 on the supporting beam 212 is lowered into the underground passage 1; the fluted disc 243 is used for shifting the pin shaft 2311 on the turntable 231, so that the turntable 231 rotates by an angle of 90 degrees, and the bogie 300 on the supporting beam 212 is driven to rotate by an angle of 90 degrees, so as to smoothly pass through the underground passage 1; then, the running wheels 242 slide on the running rails 13 in the underground passage 1, the bogie 300 to be replaced is conveyed to the position below the passage outlet 12, the supporting beams 212 are lifted to be flush with the rails 500 of the bogie maintenance warehouse through the lifting assembly 22, an operator moves the bogie 300 to the bogie maintenance warehouse to maintain (or replace a new bogie), and finally, the maintained bogie (or the new bogie) is returned to the original way and installed on the train body of the motor train unit 100.

The bogie replacement system provided by the embodiment can realize the quick replacement of the bogie 300 of the motor train unit 100 in the inspection warehouse, is wide in application range and low in modification cost, does not influence other inspection operations in the inspection warehouse, improves the maintenance efficiency of the motor train unit 100, and ensures the normal driving of the motor train unit 100.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A bogie change system, comprising an underground tunnel (1) and a conveyor (2) arranged in the underground tunnel (1), the conveyor (2) comprising:

a running assembly (24) movably arranged in the underground passage (1);

a support assembly (21) height-adjustably arranged on the running assembly (24) for supporting a bogie (300) to be replaced;

the lifting assembly (22) is arranged between the walking assembly (24) and the supporting assembly (21) and is used for adjusting the height of the supporting assembly (21).

2. The bogie change system according to claim 1, wherein the conveyor (2) further comprises a rotating assembly (23), the rotating assembly (23) being arranged between the lifting assembly (22) and the running assembly (24) for rotating the bogie (300) to be changed to a preset attitude.

3. The truck changing system according to claim 2, wherein the rotating assembly (23) comprises a turntable (231), the running assembly (24) comprises a base plate (241), the turntable (231) is rotatably disposed on the base plate (241), and the lifting assembly (22) is disposed on the turntable (231).

4. The truck changing system according to claim 3, wherein the turntable (231) is rotatably connected to the base plate (241) by a rotating shaft (2312), the rotating shaft (2312) being mounted on the base plate (241) by a bearing (2411).

5. The truck changing system according to claim 3, wherein a plurality of pins (2311) are disposed on the turntable (231), the plurality of pins (2311) are spaced apart along a circumferential direction of the turntable (231), and a rotatable toothed disc (243) is disposed on the base plate (241), and the toothed disc (243) can shift the pins (2311) to rotate the turntable (231).

6. Truck changing system according to claim 3, wherein the lifting assembly (22) is a scissor lift (221), the fixed end of the scissor lift (221) being arranged on the turntable (231), the output end of the scissor lift (221) being connected to the support assembly (21).

7. The bogie change system according to claim 3, wherein the running assembly (24) further comprises running wheels (242), the running wheels (242) being provided on the floor (241), the underground tunnel (1) being provided with running rails (13), the running wheels (242) being slidable on the running rails (13) for transporting the bogie (300) to be changed.

8. The bogie exchange system according to claim 1, wherein the support assembly (21) comprises a support beam (212) and a locking device (211), the support beam (212) is provided with a positioning hole (2121), the locking device (211) is arranged on a track bridge (400), the locking device (211) comprises a driving mechanism (2112) and a connecting shaft (2111), and the driving mechanism (2112) can drive the connecting shaft (2111) to be inserted into the positioning hole (2121) so as to lock the support beam (212) and the track bridge (400).

9. The system for changing the bogie according to claim 8, wherein the driving mechanism (2112) comprises a sleeve (21121), a first rod (21122), a second rod (21123) and a driving rod (21124), the sleeve (21121) is arranged on the track bridge (400), the connecting shaft (2111) is slidably arranged in the sleeve (21121), the first rod (21122) and the second rod (21123) are arranged at an included angle, one end of the first rod (21122) is rotatably connected with the connecting shaft (2111), the other end of the first rod (21122) is rotatably connected with one end of the second rod (21123), the other end of the second rod (21123) is rotatably connected with the driving rod (21124), a limit groove (402) is arranged on the track bridge (400) along the height direction, and the rotatably connected ends of the first rod (21122) and the second rod (21123) are slidably arranged in the limit groove (402), the driving rod (21124) can pull the second rod (21123) to push the first rod (21122), so as to drive the connecting shaft (2111) to be inserted into the positioning hole (2121).

10. Truck changing system according to any of the claims 1-9, wherein the underground passage (1) comprises a passage entrance (11), the track bridge (400) is provided with an avoidance break (401), and the passage entrance (11) is arranged below the avoidance break (401).