CN111794099A - A bogie replacement system - Google Patents

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

A bogie replacement system

technical field

The invention relates to the field of EMU maintenance equipment, in particular to a bogie replacement system.

Background technique

When the EMU completes the operation task, it needs to return to the inspection warehouse for daily maintenance and maintenance work. Since the inspection warehouse lacks special equipment for dismantling and repairing the bogie of the EMU, when the maintenance personnel find that the bogie is faulty, the entire EMU needs to be transferred to the third-level maintenance warehouse or temporary repair warehouse for maintenance.

However, the investment cost of the three-level maintenance warehouse and the temporary maintenance warehouse is too high, and it is not easy to build on a large scale. Therefore, the inspection warehouses in some places are not equipped with three-level maintenance warehouses or temporary maintenance warehouses, which makes it difficult to dismantle and repair the faulty bogie. In the third-level maintenance warehouse, pit-type cranes or mobile cranes are generally used for the dismantling of the bogie, but these equipments are complex in structure, occupy a large area, and have high investment costs, so they are not suitable for use in the maintenance warehouse. configuration. Removing the bogie usually requires lifting the car body to a certain height, and lifting the car body in the inspection warehouse interferes with the high-voltage catenary on the top of the inspection warehouse, so it is not suitable to lift the car body in the inspection warehouse. If the gantry type support device of the temporary repair warehouse is configured in the inspection warehouse, it needs to be installed on the side of the track bridge, occupying the passages on both sides of the track bridge, which will affect other inspection operations of the inspection warehouse.

SUMMARY OF THE INVENTION

Based on the above problems, an object of the present invention is to provide a bogie replacement system, which can replace the bogie in an inspection warehouse without affecting other inspection operations.

For achieving the above object, the present invention adopts the following technical solutions:

A bogie replacement system, comprising an underground passage and a transportation device arranged in the underground passage, the transportation device comprising:

a running component, which is movably arranged in the underground passage;

a support assembly, which is arranged on the running assembly in a height-adjustable manner and used to support the bogie to be replaced;

The lifting component is arranged between the running component and the supporting component, and is used for adjusting the height of the supporting component.

As a preferred solution of the bogie replacement system of the present invention, the transport device further includes a rotating assembly, the rotating assembly is disposed between the lifting assembly and the traveling assembly, and is used to replace the bogie to be replaced. Rotate to preset pose.

As a preferred solution of the bogie replacement 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 preferred solution of the bogie replacement 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 solution of the bogie replacement system of the present invention, a plurality of pin shafts are arranged on the turntable, and the plurality of pin shafts are distributed at intervals along the circumference of the turntable, and a rotatable toothed disc is arranged on the bottom plate. , the gear plate can toggle the pin shaft to make the turntable rotate.

As a preferred solution of the bogie replacement system of the present invention, the lift assembly is a scissor lift mechanism, the fixed end of the scissor lift mechanism is set on the turntable, and the output end of the scissor lift mechanism connected to the support assembly.

As a preferred solution of the bogie replacement system of the present invention, the running assembly further includes running wheels, the running wheels are arranged on the bottom plate, the underground passage is provided with running tracks, and the running wheels can run on the Slide on rails to transport said bogies to be replaced.

As a preferred solution of the bogie replacement 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 disposed on the track bridge, and the locking device includes a drive A mechanism and a connecting shaft are provided, wherein 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 preferred solution 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 arranged on the track bridge, and the connecting shaft is slidably arranged on the In the sleeve, the first rod and the second rod are arranged at an angle, one end of the first rod is rotatably connected with the connecting shaft, and the other end of the first rod is connected with the second rod. One end of the rod is rotatably connected, the other end of the second rod is rotatably connected with the drive rod, the rail bridge is provided with a limiting groove along the height direction, and the rotating connection ends of the first rod and the second rod The driving rod is slidably arranged in the limiting groove, and the driving rod can pull the second rod to push the first rod, thereby driving the connecting shaft to be inserted into the positioning hole.

As a preferred solution 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 arranged below the avoidance fracture.

The beneficial effects of the present invention are:

The bogie replacement system provided by the invention can be used to replace the bogie of the EMU in the inspection warehouse. When the EMU drives into the track bridge of the inspection warehouse, the bogie to be replaced is stopped at the avoidance fracture of the track bridge. The bogie to be replaced is supported by the support assembly. The operator disassembles the bogie to be replaced from the body of the EMU, and adjusts the height of the support assembly through the lifting assembly, so as to lower the bogie into the underground passage, and pass the running assembly to the underpass. Slide in the underground passage, transport the bogie to be replaced to the bogie maintenance warehouse for maintenance (or replace a new bogie), and finally, return the repaired bogie (or new bogie) to the original way and install it on on the body of the EMU. The bogie replacement system provided by the invention can realize the rapid replacement of the bogie of the EMU in the inspection warehouse, has a wide range of applications, low reconstruction cost, does not affect other inspection operations in the inspection warehouse, and improves the maintenance efficiency of the EMU. To ensure the normal running of the EMU.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. , for those of ordinary skill in the art, other drawings can also be obtained according to the contents of the embodiments of the present invention and these drawings without creative efforts.

1 is a schematic structural diagram of a bogie replacement system provided by a specific embodiment of the present invention from a first perspective;

2 is a schematic structural diagram of a bogie replacement system provided by a specific embodiment of the present invention from a second perspective;

Fig. 3 is the partial enlarged view of A place in Fig. 2;

4 is a schematic structural diagram of the lifting assembly in the bogie replacement system provided by the specific embodiment of the present invention when it falls to the lowest point;

5 is a schematic structural diagram of a bogie replacement system provided by a specific embodiment of the present invention from a third perspective;

FIG. 6 is a partial enlarged view of B in FIG. 2 .

In the picture:

1-underground passage; 2-transportation device;

11-channel entrance; 12-channel exit; 13-travel track;

21-support component; 22-lifting component; 23-rotating component; 24-travel component;

211-locking device; 212-support beam; 2121-positioning hole;

2111 - connecting shaft; 2112 - driving mechanism;

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

221- scissor lift mechanism; 222- hydraulic cylinder;

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

241-base plate; 2411-bearing; 242-travel wheel; 243-tooth plate; 244-first reducer; 245-second

reducer;

100- EMU; 200- Hydraulic support column; 300- Bogie; 400- Track bridge; 401- Avoidance fracture;

402-Limiting slot; 500-Bogie maintenance garage track.

Detailed ways

In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clearly, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only the present invention. Some examples, but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts 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. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance. Therein, the terms "first position" and "second position" are two different positions.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

As shown in FIG. 1 and FIG. 2 , this embodiment provides a bogie replacement system, which can be used to replace the bogie 300 of the EMU 100 in an inspection warehouse. The bogie replacement system includes an underground passage 1 and a transport device 2 arranged in the underground passage 1 . Wherein, the transport device 2 includes a traveling assembly 24 , a supporting assembly 21 and a lifting assembly 22 . The traveling assembly 24 is movably disposed in the underground passage 1 , the supporting assembly 21 is arranged on the traveling assembly 24 in a height-adjustable manner, and is used to support the bogie 300 to be replaced, and the lifting assembly 22 is disposed between the traveling assembly 24 and the supporting assembly 21 . space for adjusting the height of the support assembly 21 .

In order to avoid affecting other maintenance operations in the inspection warehouse, optionally, an avoidance fracture 401 is provided on the track bridge 400, and the support assembly 21 includes a support beam 212. The support beam 212 can be lifted to a position flush with the avoidance fracture 401 to fill the By avoiding the break 401 , the EMU 100 can be pulled to the break 401 of the track bridge 400 , and the bogie 300 to be replaced can be stopped at the break 401 of the track bridge 400 . A tunnel entrance 11 is dug on the ground below the escape fracture 401 , and the tunnel entrance 11 communicates with the underground tunnel 1 . The underground passage 1 also includes a passage outlet 12, which is connected to the track 500 of the bogie maintenance depot, and transports the bogie 300 to be replaced to the bogie maintenance depot through the underground passage 1 for maintenance or replacement of a new bogie.

After the EMU 100 drives into the inspection warehouse, if a certain bogie 300 is found to be faulty after inspection by the staff, the EMU 100 is towed to the avoidance fracture 401 of the track bridge 400, and the to-be-replaced bogie 300 is parked on the track At the position of the avoidance fracture 401 of the bridge 400, the bogie 300 to be replaced is supported by the support beam 212. The operator disassembles the bogie 300 to be replaced from the body of the EMU 100, and then supports the body through the two hydraulic support columns 200. The truck 300 is lowered to the underground passage 1 by adjusting the height of the support beam 212 through the lifting assembly 22 , so that the truck 300 does not bear the weight of the vehicle body. Then slide in the underground passage 1 through the running assembly 24, and transport the bogie 300 to be replaced to the bogie maintenance warehouse for maintenance (or replace a new bogie), and finally, the repaired bogie 300 (or new The bogie) is returned to the original road and installed on the body of the EMU 100. The bogie replacement system provided in this embodiment can quickly replace the bogie 300 of the EMU 100 in the inspection warehouse, has a wide range of applications, low cost of transformation, does not affect other inspection operations in the inspection warehouse, and improves the efficiency of the EMU 100 The high maintenance efficiency ensures the normal operation of the EMU 100.

In this embodiment, in order to facilitate the EMU 100 to pass through the avoidance fracture 401 of the track bridge 400, the support beam 212 can be locked and fixed with the track bridge 400 on both sides of the avoidance fracture 401. Optionally, the support assembly 21 further includes a locking device 211 , the support beam 212 is provided with a positioning hole 2121, the locking device 211 is arranged on the track bridge 400, the locking device 211 includes a driving mechanism 2112 and a connecting shaft 2111, the driving mechanism 2112 can drive the connecting shaft 2111 to be inserted into the positioning hole 2121 to The support beam 212 is locked with the track bridge 400 . A locking device 211 is provided on the track bridge 400 on both sides of the avoidance fracture 401. Correspondingly, both sides of the support beam 212 are provided with positioning holes 2121. The rail bridge 400 is locked and fixed to improve the bearing capacity of the support beam 212 .

In order to facilitate the extension of the connecting shaft 2111, as shown in FIG. 3, optionally, the driving mechanism 2112 includes a sleeve 21121, a first rod 21122, a second rod 21123 and a driving rod 21124, and the sleeve 21121 is provided on the track bridge 400, The connecting shaft 2111 always slides along the axial direction of the sleeve 21121 , which can ensure that the connecting shaft 2111 can be inserted into the positioning hole 2121 of the support beam 212 horizontally. 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, and the other end of the second rod 21123 is rotatably connected. One end is rotatably connected with the drive rod 21124, a limit slot 402 is provided on the rail bridge 400 along the height direction, the rotational connection ends of the first rod 21122 and the second rod 21123 are slidably arranged in the limit slot 402, and the drive rod 21124 can pull the second rod 21124. The rod 21123 is used to push the first rod 21122, thereby driving the connecting shaft 2111 to be inserted into the positioning hole 2121. This setting method can not only ensure that the connecting shaft 2111 moves in the horizontal direction, but also play a buffering role, which is not easy to cause damage to the driving rod 21124. , prolonging the service life of the locking device 211 .

In this embodiment, in order to easily adjust the height of the support beam 212, optionally, the lifting assembly 22 selects a scissor lift mechanism 221 in the prior art, and the fixed end of the scissor lift mechanism 221 is set on the turntable 231, The output end of the scissor lift mechanism 221 is connected to the support beam 212 . When the connecting shaft 2111 is pulled out 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 driven by the scissor lift mechanism 221 to drop to FIG. 4 . Location.

The power source of the scissor lift mechanism 221 can be a hydraulic drive system, and the hydraulic drive system includes a hydraulic station, a hydraulic cylinder 222, a control valve and a pipeline. The hydraulic station is connected with the hydraulic cylinder 222 through pipelines and a control valve, and the control valve is used to adjust 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 this embodiment, as long as the lift assembly 22 can be driven to realize the height adjustment of the support beam 212. For example, the power source of the scissor lift mechanism 221 can also be Electric drive or pneumatic drive.

Optionally, the transporting device 2 further includes a rotating assembly 23, which is disposed between the lifting assembly 22 and the traveling 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 vertical relationship with the track 500 of the bogie maintenance storehouse, and there may be multiple inspection operation lines in the inspection storehouse. In order to make the bogie 300 to be replaced just match the track 500 of the bogie maintenance garage when it reaches the position of the passage exit 12, optionally, when the lift assembly 22 is lowered to the lowest position, the bogie 300 to be replaced is rotated 90 degrees angle, but is not limited to a 90-degree angle in this embodiment, and can be rotated by a preset angle in other embodiments according to actual conditions.

Optionally, as shown in FIG. 6 , the rotating assembly 23 includes a turntable 231 , the traveling assembly 24 includes 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 . When the turntable 231 rotates on the bottom plate 241 , it drives the lifting assembly 22 , the support beam 212 and the bogie 300 to rotate together, so as to rotate the bogie 300 to a preset posture. In order to make the turntable 231 easier to rotate relative to the base plate 241, optionally, one end of the rotating shaft 2312 is fixedly connected to the turntable 231, and the other end of the rotating shaft 2312 is rotatably connected to the base plate 241 through the bearing 2411. There is a groove on the table, and the bearing 2411 is installed in the groove. In this embodiment, the bearing 2411 can be a spherical roller bearing, and the rotating friction between the rotating shaft 2312 and the bottom plate 241 is reduced by the spherical roller bearing. force, it is easier to realize the rotation of the turntable 231 . The selection of the bearing 2411 is not limited to the spherical roller bearing, as long as the purpose of easy rotation can be achieved. Further, since the length of the bogie 300 in the longitudinal direction (traveling direction) is longer than the width in the lateral direction (perpendicular to the direction of travel), the bogie 300 can be made more compact after the bogie 300 dropped below the tunnel entrance 11 is rotated by 90 degrees. It is easy to pass through the underground passage 1, and at the same time, the cross-sectional area of the underground passage 1 can be reduced, and the construction cost of the underground passage 1 can be reduced.

In order to rotate the turntable 231 at an angle of 90 degrees, optionally, a plurality of pins 2311 are provided on the turntable 231 , that is, a plurality of pins 2311 are arranged at the bottom of the turntable 231 at equal intervals along the circumference of the turntable 231 , and are arranged on the bottom plate 241 There are a first reducer 244 and a toothed plate 243, the toothed plate 243 is driven by the first reducer 244, and then the toothed plate 243 toggles the pin shaft 2311 to rotate the turntable 231 at an angle of 90 degrees. Wherein, when the lift assembly 22 descends to the bottom point, the turntable 231 starts to rotate.

In this embodiment, in order to facilitate the transportation of the bogie 300 to be replaced, optionally, the running assembly 24 further includes running wheels 242 . The running wheels 242 are arranged on the bottom plate 241 , and the underground passage 1 is provided with running rails 13 . The running wheels 242 is driven by the second reducer 245 arranged on the bottom plate 241 and can slide on the running track 13 to transport the bogie 300 to be replaced. When the turntable 231 and the bogie 300 rotate at an angle of 90 degrees, the running wheels 242 begin to slide on the running track 13 to transport the bogie 300 to be replaced to the passage exit 12 . In order to ensure that the traveling wheel 242 can stop moving at the designated position, optionally, a magnetic induction switch is installed on the bottom plate 241, and positioning iron pieces are arranged at the channel entrance 11 and the channel outlet 12 of the underground passage 1. When the magnetic induction switch reaches the positioning iron When the position of the sheet is detected, an induction signal can be generated, and the traveling wheel 242 stops moving. When the bogie 300 reaches the channel exit 12, the bogie 300 is lifted to the bogie maintenance warehouse track 500 by the scissor lift mechanism 221 again, and the bogie 300 is transferred to the bogie maintenance warehouse along the bogie maintenance warehouse track 500. The operator repairs the bogie 300 or replaces the bogie with a new one, and then returns the repaired bogie or the new bogie to the body of the EMU 100 in the same way.

The general working process of the bogie replacement system provided in this embodiment is as follows: after the EMU 100 enters the inspection warehouse, the transport device 2 is located below the passage entrance 11 of the underground passage 1, and the lift assembly 22 lifts the support beam 212 at this time. , the support beam 212 fills the avoidance fracture 401 of the track bridge 400 and is flush with the track bridge 400 on both sides. Can pass the support beam 212 at the avoidance fracture 401 of the rail bridge 400; when the operator checks and finds that a certain bogie 300 of the EMU 100 is faulty, the EMU 100 is towed and the bogie 300 to be replaced is parked on the rail bridge At the avoidance fracture 401 of 400, the bogie 300 to be replaced is supported by the support beam 212. The operator disassembles the bogie 300 to be replaced from the body of the EMU 100, and then supports the body through two hydraulic support columns 200. Therefore, the bogie 300 does not bear the weight of the vehicle body. At this time, the connection between the support beam and the rail bridge is unlocked, the height of the support beam 212 is adjusted by the lifting assembly 22, and the bogie 300 on the support beam 212 is lowered to the underground passage. Inside 1; toggle the pin 2311 on the turntable 231 through the toothed disc 243, so that the turntable 231 rotates 90 degrees, and drives the bogie 300 on the support beam 212 to rotate 90 degrees to smoothly pass through the underground passage 1; 242 slides on the running track 13 in the underground passage 1, transports the to-be-replaced bogie 300 below the passage exit 12, and lifts the support beam 212 to be flush with the bogie maintenance store rail 500 through the lifting assembly 22, and the operator will The bogie 300 is moved to the bogie maintenance warehouse for maintenance (or a new bogie is replaced), and finally, the repaired bogie (or a new bogie) is returned to the original path and installed on the body of the EMU 100 .

The bogie replacement system provided in this embodiment can quickly replace the bogie 300 of the EMU 100 in the inspection warehouse, has a wide range of applications, low cost of transformation, does not affect other inspection operations in the inspection warehouse, and improves the efficiency of the EMU 100 The high maintenance efficiency ensures the normal operation of the EMU 100.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention. The scope is determined by the scope of the appended claims.

Claims (10)

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).

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