JP7593752B2 - Compaction rail car - Google Patents

Description

The present invention relates to a compaction track vehicle.

In ballasted tracks used for railways, the trackbed is formed by laying crushed stone (ballast) on the roadbed. Sleepers are placed on top of this trackbed, and rails are laid on top of the sleepers. The load of a train running along the rails of a ballasted track acts on the trackbed via the rails and sleepers, and is transmitted to the roadbed in a widely dispersed state by the numerous crushed stones that make up the trackbed.

In the parts of the trackbed of a ballast track that receive the load from trains through the rails and sleepers, the crushed stone that makes up that part is repeatedly subjected to loads every time a train passes. As a result, there is a risk that the corners of the crushed stone may chip, causing the rails and sleepers supported by the crushed stone to sink. Therefore, it is conceivable that the settlement of the rails and sleepers could be prevented by periodically compacting the crushed stone in the parts of the trackbed that support the rails and sleepers using a compacting track car as shown in Patent Document 1.

This compaction track car has a car body that runs along the rails of the ballast track. A tamping bar for compacting the crushed stone that forms the trackbed of the ballast track is supported on the car body. In addition, the compaction track car is equipped with a vibration device that vibrates the tamping bar, and a movement device that moves the tamping bar in the vertical direction.

In this compaction track vehicle, the moving device lowers the tamping bar, which is inserted into the track bed of the ballast track. The crushed stone that forms the track bed, which is subject to the load from the rail side via the sleepers, is compacted by the vibration of the tamping bar caused by the vibration device. A flat pressing part is formed at the lower end of the tamping bar to effectively transmit vibrations to the crushed stone.

Japanese Unexamined Patent Publication No. 52-126811

In the compaction track car of Patent Document 1, a flat pressing portion is formed at the lower end of the tamping bar, so there is a large resistance when the tamping bar is lowered and inserted into the track bed. When inserting the tamping bar into the track bed against this resistance, the weight of the compaction track car must be increased so that the compaction track car does not lift off the rails. However, if the compaction track car becomes larger with this increase in weight, it becomes difficult to handle when using the compaction track car.

The object of the present invention is to provide a compaction track vehicle that is easy to handle when in use.

The means for solving the above problems and their effects will be described below.
The compaction track car that solves the above problem includes a car body that travels along the rails of a ballast track, a tamping bar supported on the car body, a vibration device that vibrates the tamping bar, and a moving device that moves the tamping bar in an up and down direction. The compaction track car lowers the tamping bar to insert it into the track bed of the ballast track, and compacts the crushed stone that forms the track bed, in a portion that receives the load from the rails through sleepers, by vibrating the tamping bar. The tamping bar is formed in a cylindrical shape that is long in the direction of movement by the moving device and tapers downward.

With the above configuration, the tamping bar is longer in the direction of movement by the moving device, and the lower end of the tamping bar is tapered, so that the resistance when the tamping bar is lowered and inserted into the track bed can be kept small. Therefore, when inserting the tamping bar into the track bed against the resistance, there is no need to increase the weight of the compaction track car so that it does not float off the rails. As a result, the compaction track car does not become larger due to an increase in weight, making it easier to handle when using the compaction track car.

The moving device may be configured to move the tamping bar in a direction along which a center line of the tamping bar extends.
With this configuration, when the tamping bar is inserted into the track bed, the direction of the center line of the tamping bar is the same as the direction of movement of the tamping bar, so the resistance caused by inserting the tamping bar into the track bed can be reduced, and the compaction track car can be made even lighter.

In the above compaction track car, at the lower end of the range of movement of the tamping bar by the moving device, the lower end of the tamping bar is positioned below the sleepers and above the roadbed of the ballast track. In addition, the moving device is equipped with a conversion mechanism that converts the force acting in the direction of movement when the tamping bar is to be moved downward at the lower end of its range of movement into a force that tilts the tamping bar so that the lower end of the tamping bar approaches the lower position of the sleepers.

According to the above configuration, when the tamping bar is inserted into the track bed and reaches the lower end of the moving range, the conversion mechanism tilts the tamping bar so that the lower end of the tamping bar approaches the lower position of the sleeper as the moving device tries to move the tamping bar downward. This tilt of the tamping bar allows for effective compaction of the crushed stone on the track bed that is loaded by the sleeper. The tilt of the tamping bar is achieved by converting the force acting in the moving direction of the tamping bar by the moving device into a force in the direction that causes the tilt through the conversion mechanism. Therefore, the structure of the compaction track car can be simplified compared to a case where a device for tilting the tamping bar is provided separately from the moving device. Furthermore, when tilting the tamping bar, the lower end of the tamping bar is positioned below the sleeper and above the roadbed of the ballast track. Therefore, it is possible to prevent the lower end of the tamping bar from coming into contact with the sleeper or roadbed as the tamping bar tilts, which would result in damage to the sleeper or roadbed.

The tamping bars may be provided in a plurality, each positioned on either side of the sleeper in the direction in which the rail extends. The moving device may be configured to move the tamping bars positioned on either side of the sleeper in the direction in which the rail extends, in the vertical direction. The conversion mechanism may convert the force acting in the direction of movement of the tamping bars positioned on either side of the sleeper in the direction in which the rail extends downward at the lower end of the moving range into a force that tilts the tamping bars as follows. That is, when the conversion mechanism is configured to move the tamping bars downward by the moving device, the conversion mechanism converts the force acting in the direction of movement into a force that tilts the tamping bars so that the lower ends of the tamping bars positioned on either side of the sleeper in the direction in which the rail extends approach the lower position of the sleeper.

According to the above configuration, the tamping bars located on both sides of the sleeper in the direction in which the rail extends are tilted as described above, so that the crushed stone on the ballast that receives the load from the sleeper is effectively compacted.

In the above-mentioned compaction rail car, it is possible to make it possible to change the support position of the tamping bar with respect to the car body in the width direction of the rail.
According to this configuration, by changing the support position of the tamping bar relative to the vehicle body in the width direction of the rail, the crushed stone can be compacted at multiple locations in the width direction of the rail, making the compaction of the crushed stone effective.

FIG. FIG. FIG. 4 is a cross-sectional view showing the arrangement of a moving device on a compaction rail car. FIG. 4 is a cross-sectional view showing the arrangement of a moving device on a compaction rail car. FIG. 4 is a side view showing the structure of the moving device and the tamping bar. FIG. 4 is a side view showing the structure of the moving device and the tamping bar. FIG. 4 is a side view showing the structure of the moving device and the tamping bar.

Hereinafter, one embodiment of the compaction rail car will be described with reference to Figs.
As shown in Figure 1, in a ballast track 1 used for railways, etc., a track bed 4 of a predetermined thickness is formed by laying crushed stones (ballast) 3 on a roadbed 2. Sleepers 5 are arranged parallel to each other at equal horizontal intervals on top of this track bed 4. A pair of rails 6 (only one is shown in Figure 1) are laid on top of the sleepers 5 so as to be perpendicular to each sleeper 5. The pair of rails 6 are parallel to each other and spaced apart horizontally.

The compaction track car 7 is used to compact the crushed stone 3 in the portion of the trackbed 4 that supports the rails 6 and sleepers 5. The compaction track car 7 has a car body 8 that runs along the rails 6 of the ballast track 1. The car body 8 has a front part 8a that is supported on the rails 6 via wheels 10a, and a rear part 8b that is supported on the rails 6 via wheels 10b. The front part 8a and the rear part 8b of the car body 8 are connected to each other at a predetermined horizontal distance by a pair of connecting bars 13 (only one is shown in FIG. 1) provided on the car body 8.

The front part 8a of the car body 8 is provided with a running motor 9 for rotating the wheels 10a. The wheels 10a are rotated by driving the running motor 9, causing the car body 8 to run along the rails 6. The rear part 8b of the car body 8 is provided with a seat 11 for a user to sit on, and an operation table 12 that the user uses to operate the compaction track car 7. A support frame 15 and a movement device 16 are provided between the front part 8a and the rear part 8b of the car body 8. A tamping bar 14 is supported on the car body 8 (connecting bar 13) via the support frame 15 and the movement device 16. The tamping bar 14 is used to compact the crushed stone 3 in the part of the track bed 4 that supports the rails 6 and sleepers 5.

The support frame 15 has legs 15a fixed to the connecting bar 13 of the car body 8 and protruding upward, and a frame body 15b fixed to the upper end of the legs 15a. The moving device 16 extending in the vertical direction is attached to the frame body 15b. The pair of tamping bars 14 are attached to the lower end of the moving device 16. The pair of tamping bars 14 are provided at a predetermined interval in the direction in which the rail 6 extends (left and right direction in Figure 1). When the car body 8 is moved so that the moving device 16 is located above the sleeper 5, the pair of tamping bars 14 are located on both sides of the sleeper 5 in the direction in which the rail 6 extends.

Figure 2 shows the compaction track car 7 as seen from above. As can be seen from Figure 2, the moving device 16 and the pair of tamping bars 14 are provided to be positioned on both sides of the width of one of the pair of rails 6 (the vertical direction in Figure 2), and are also provided to be positioned on both sides of the width of the other rail 6. The moving device 16 penetrates the inside of the frame body 15b, which is formed in a rectangular frame shape, in the vertical direction (the direction perpendicular to the paper surface of Figure 2). A support piece 17 that protrudes in the extension direction of the rail 6 is formed in the part of the moving device 16 that penetrates the inside of the frame body 15b. This support piece 17 can be positioned and fixed to the frame body 15b by a positioning portion 18 provided on the frame body 15b.

The positioning parts 18 are provided on the frame body 15b at positions close to the rail 6 and at positions away from the rail 6. The support positions of the moving device 16 and the tamping bar 14 relative to the car body 8 can be changed in the width direction of the rail 6 by positioning and fixing the support piece 17 of the moving device 16 by the positioning part 18 close to the rail 6 and by positioning and fixing by the positioning part 18 far from the rail 6.

Incidentally, FIG. 3 shows a state in which the moving device 16 and the tamping bar 14 are supported on the vehicle body 8 at a position away from the rail 6 by positioning and fixing the support piece 17 of the moving device 16 by a positioning part 18 located away from the rail 6. Also, FIG. 4 shows a state in which the moving device 16 and the tamping bar 14 are supported on the vehicle body 8 at a position close to the rail 6 by positioning and fixing the support piece 17 of the moving device 16 by a positioning part 18 located close to the rail 6.

Next, the moving device 16 and the tamping bar 14 will be described in detail.
5, the moving device 16 is provided with a rectangular cylindrical fixed post 19 having the support piece 17. A movable post 20 capable of moving vertically relative to the fixed post 19 is provided inside the fixed post 19. The movable post 20 protrudes downward from the fixed post 19 or moves upward into the fixed post 19 due to the vertical movement of the movable post 20 relative to the fixed post 19.

A hydraulic cylinder 21 that expands and contracts in the vertical direction is provided inside the fixed column 19 and the movable column 20. The upper end of the hydraulic cylinder 21 is fixed to the fixed column 19. The lower end of the hydraulic cylinder 21 is located corresponding to the lower end of the movable column 20. A shaft 22 extending in the longitudinal direction of the sleeper 5 (a direction perpendicular to the paper surface of FIG. 5) is fixed to the lower end of the hydraulic cylinder 21. This shaft 22 is inserted into a long hole 23 that extends in the vertical direction and is formed in the lower end of the movable column 20, and can be displaced in the vertical direction within the long hole 23.

The weight of the movable columns 20 and the like can be supported by the support frame 15 via the shaft 22, hydraulic cylinder 21, and fixed column 19. When the hydraulic cylinder 21 is expanded or contracted in the vertical direction while the weight of the movable columns 20 and the like is acting on the shaft 22, the movable columns 20 protrude downward from the fixed column 19 or penetrate upward into the fixed column 19. The lower end of a reinforcing bar 24 that extends in the vertical direction is fixed to the movable column 20. The upper end of this reinforcing bar 24 passes through a receiving portion 25 fixed to the fixed column 19 in the vertical direction.

The reinforcing bar 24 moves vertically together with the vertical movement of the movable column 20 as the hydraulic cylinder 21 expands and contracts, and at the same time moves vertically relative to the receiving part 25 of the fixed column 19. A nut 26 is fixed to the part of the reinforcing bar 24 above the receiving part 25. When the movable column 20 and the reinforcing bar 24 move downward due to the extension of the hydraulic cylinder 21 and the nut 26 comes into contact with the receiving part 25, the downward movement of the movable column 20 and the reinforcing bar 24 is restricted by the nut 26.

When the hydraulic cylinder 21 is further extended while the downward movement of the movable column 20 and the reinforcing bar 24 is restricted in this manner, the shaft 22 fixed to the lower end of the hydraulic cylinder 21 is displaced downward within the long hole 23 of the movable column 20, in other words, the shaft 22 moves downward relative to the movable column 20. When the hydraulic cylinder 21 is then contracted, the shaft 22 is displaced upward within the long hole 23, in other words, the shaft 22 moves upward relative to the movable column 20. When the shaft 22 reaches the upper end of the long hole 23, the shaft 22 begins to bear the weight of the movable column 20 and the like. Therefore, as the hydraulic cylinder 21 contracts, the movable column 20 and the reinforcing bar 24 move upward relative to the fixed column 19, and the nut 26 moves upward away from the receiving part 25.

A bracket 27 is fixed to the lower end of the movable column 20, extending in the same direction as the rail 6 (left and right direction in FIG. 5). The tamping bar 14 is attached to both ends of the bracket 27. More specifically, the upper end of the tamping bar 14 is supported rotatably relative to the end of the bracket 27 by a pin 28 that extends in the same direction as the extension of the sleepers 5 (direction perpendicular to the paper surface of FIG. 5). The tamping bar 14 moves up and down in the same way as the movable column 20, in accordance with the relative movement of the movable column 20 in the up and down direction with respect to the fixed column 19 of the moving device 16.

The tamping bar 14 is formed in a cylindrical shape that is longer in the direction of movement by the moving device 16 (the vertical direction in Figure 5) and tapers downward. The moving device 16 moves the tamping bar 14 in the direction of the center line of the tamping bar 14 by vertical relative movement of the movable column 20 with respect to the fixed column 19. At the lower end of the range of movement of the tamping bar 14 by the moving device 16, the lower end of the tamping bar 14 is located below the sleepers 5 and above the roadbed 2.

A vibration device 29 is provided at the upper end of the tamping bar 14 to vibrate the tamping bar 14. The vibration device 29 rotates an eccentric shaft by driving an actuator such as a motor, and imparts vibrations generated by the rotation to the tamping bar 14. The eccentric shaft is an axis whose center of gravity is located away from the center line. Also, instead of a motor, it is possible to use other actuators such as an engine as the actuator that rotates the eccentric shaft.

An arm 30 is formed below the pin at the upper end of the tamping bar 14. The arm 30 is connected to the shaft 22 via a link 31. One longitudinal end of the link 31 is rotatably connected to the arm 30. The other longitudinal end of the link 31 is rotatably connected to the shaft 22. The longitudinal center of the link 31 is rotatably connected to a support 32 formed on the bracket 27. The rotation centers C1, C2, and C3 of both ends and the center of the link 31 extend in the same direction as the extension direction of the sleeper 5. The rotation center C3 of the center of the link 31 can be displaced within a predetermined range in the extension direction of the rail 6 relative to the support 32.

When the pair of tamping bars 14 attempt to move downward at the lower end of their vertical movement range due to the extension of the hydraulic cylinder 21 in the moving device 16, the shaft 22 moves downward relative to the movable column 20, and the shaft 22 moves relatively from top to bottom within the long hole 23 as shown in Figures 5, 6, and 7. In this case, the pair of tamping bars 14 are rotated around the pin 28 by the link 31 or the like in accordance with the relative movement of the shaft 22. As a result, the pair of tamping bars 14 are tilted in the vertical direction so that the lower ends of the pair of tamping bars 14 approach each other.

When the shaft 22 moves upward relative to the movable column 20 due to contraction of the hydraulic cylinder 21, the shaft 22 moves from bottom to top within the long hole 23 as shown in Figures 7, 6, and 5. In this case, the above-mentioned relative movement of the shaft 22 causes the pair of tamping bars 14 to rotate around the pin 28 in the opposite direction to the above-mentioned direction by the link 31 or the like. As a result, the above-mentioned inclination of the pair of tamping bars 14 in the up-down direction is eliminated, and the lower ends of the tamping bars 14 move away from each other.

The arm 30, link 31, and support 32 function as a conversion mechanism that converts the downward force exerted by the hydraulic cylinder 21, in other words the force that moves the pair of tamping bars 14 downward, into a force that tilts the tamping bars 14 as described above. The movement device 16 is composed of the conversion mechanism (arm 30, link 31, and support 32), fixed column 19, movable column 20, hydraulic cylinder 21, shaft 22, bracket 27, etc.

Next, the operation of the compaction rail car 7 will be described.
The compaction track car 7 is used to compact the crushed stone 3 that forms the track bed 4 of the ballast track 1 and supports the rail 6 and sleepers 5. In detail, the compaction track car 7 is moved along the rail 6 to position the fixed column 19 of the moving device 16 above the sleepers 5 as shown in Figs. 1 and 2. At this time, the moving device 16 and the tamping bar 14 are positioned and fixed to the car body 8 (frame body 15b of the support frame 15) by, for example, the latter positioning part 18 of the positioning part 18 located near the rail 6 and the positioning part 18 located away from the rail 6. As a result, the moving device 16 and the tamping bar 14 are supported by the frame body 15b of the support frame 15 at a position away from the rail 6 on the car body 8 as shown in Figs. 2 and 3.

In this state, the vibration device 29 is driven to vibrate the tamping bar 14, while the hydraulic cylinder 21 (Figure 5) of the moving device 16 is extended to move the movable column 20 downward relative to the fixed column 19. As a result, the vibrating tamping bar 14 descends, and the tip (lower end) of the tamping bar 14 is inserted into the trackbed 4 of the ballast track 1. The direction of movement of the tamping bar 14 at this time is the same as the direction in which the center line of the tamping bar 14 extends. The vibrating tamping bar 14 then compacts the crushed stone 3 (Figure 1).

After that, as the movable column 20 and the reinforcing bar 24 move downward, the tamping bar 14 reaches the lower end of its vertical movement range, and the nut 26 comes into contact with the receiving part 25, restricting the downward movement of the movable column 20 and the reinforcing bar 24. When the hydraulic cylinder 21 is further extended in this state, the shaft 22 moves downward relative to the movable column 20 as shown in Figures 6 and 7, and is displaced downward within the long hole 23. Then, as the shaft 22 moves relative to the movable column 20, the pair of tamping bars 14 are tilted in the vertical direction by the link 31, etc., so that their lower ends approach each other. Even during this tilt, the tamping bar 14 vibrates, and the crushed stone 3 is compacted by the tamping bar 14.

The above-mentioned movement of the vibrating tamping bar 14 after it is inserted into the track bed 4 compacts the crushed stone 3 in the portion of the track bed 4 that supports the rails 6 and sleepers 5, i.e., the portion that receives the load from the rails 6. In this embodiment, the vibration frequency of the tamping bar 14 by the vibration device 29 is set to a value higher than in the past so that the tapered tamping bar 14 can compact the crushed stone 3 as necessary.

After the crushed stone 3 is compacted by the tamping bar 14, the hydraulic cylinder 21 of the moving device 16 is contracted. As a result, the shaft 22 moves upward relative to the movable column 20 as shown in Figures 6 and 5, and is displaced upward within the long hole 23. Then, as the shaft 22 moves relative to the movable column 20, the inclination of the pair of tamping bars 14 is eliminated by the link 31, etc. When the shaft 22 comes into contact with the upper end of the long hole 23 and begins to receive the weight of the movable column 20, etc., the shaft 22 and the movable column 20 move upward relative to the fixed column 19 as the hydraulic cylinder 21 contracts, and the tamping bar 14 is pulled out of the track bed 4.

Then, the moving device 16 and the tamping bar 14 are positioned and fixed to the vehicle body 8 (frame body 15b of the support frame 15) by a positioning part 18 located in a different position from the positioning part 18 previously used for positioning and fixing, out of a positioning part 18 located close to the rail 6 and a positioning part 18 located away from the rail 6. In this example, the moving device 16 and the tamping bar 14 are positioned and fixed to the vehicle body 8 by the positioning part 18 located close to the rail 6.

Then, by extending and retracting the hydraulic cylinder 21 in the same manner as the extension and retraction of the hydraulic cylinder 21 described above, the crushed stone 3 on the trackbed 4 is compacted. This compaction of the crushed stone 3 is performed at a position that is closer to the rail 6 than the position where the crushed stone 3 was initially compacted, among the parts of the trackbed 4 that support the rail 6 and sleepers 5, i.e., the parts that receive the load from the rail 6. Furthermore, the first and second compactions of the crushed stone 3 are performed corresponding to each of the sleepers 5 lined up in the direction in which the rail 6 extends.

According to the present embodiment described above in detail, the following effects can be obtained.
(1) The tamping bar 14 is longer in the direction of movement (up and down) by the moving device 16, and the lower end of the tamping bar 14 is tapered, so that the resistance when the tamping bar 14 is lowered and inserted into the track bed 4 can be kept small. Therefore, when inserting the tamping bar 14 into the track bed 4 against the resistance, it is not necessary to increase the weight of the compaction rail car 7 so that the compaction rail car 7 does not float off the rail 6. As a result, the compaction rail car 7 does not become larger in size due to an increase in weight, and the compaction rail car 7 is easier to handle when used.

(2) Furthermore, when the tamping bar 14 is inserted into the track bed 4, the moving device 16 moves the tamping bar 14 in the direction of its center line. Therefore, when the tamping bar 14 is inserted into the track bed 4, the direction in which the center line of the tamping bar 14 extends and the direction in which the tamping bar 14 moves are the same, so that the resistance associated with inserting the tamping bar 14 into the track bed 4 can be kept small. This allows the compaction track car 7 to be made even lighter.

(3) When the tamping bar 14 is inserted into the track bed 4 and reaches the lower end of the range of movement in the vertical direction by the moving device 16, the moving device 16 attempts to move the tamping bar 14 downward, and the tamping bar 14 is tilted so that the lower end of the tamping bar 14 approaches the lower position of the sleeper 5. This tilt of the tamping bar 14 allows for effective compaction of the crushed stone 3 that is subjected to the load from the sleeper 5 on the track bed 4. The tilt of the tamping bar 14 is realized by converting the force acting in the direction of movement of the tamping bar 14 by the moving device 16 into a force in the direction that causes the tilt by the arm 30, the link 31, and the support 32. Therefore, the structure of the compaction track car 7 can be simplified compared to the case where a device for tilting the tamping bar 14 is provided separately from the moving device 16. Furthermore, when tilting the tamping bar 14, the lower end of the tamping bar 14 is positioned below the sleepers 5 and above the roadbed 2 of the ballast track 1. This prevents the lower end of the tamping bar 14 from coming into contact with the sleepers 5 or the roadbed 2 as the tamping bar 14 tilts, thereby preventing damage to the sleepers 5 or the roadbed 2.

(4) The moving device 16 moves a pair of tamping bars 14, which are located on either side of the sleeper 5 in the direction in which the rail 6 extends, in the vertical direction. Furthermore, the pair of tamping bars 14 are tilted so that the lower ends of the tamping bars 14 approach each other at the lower end of their vertical movement range. As a result, the crushed stone 3 that receives the load from the sleepers 5 on the trackbed 4 is effectively compacted by the pair of tamping bars 14.

(5) In the compaction track car 7, the support position of the tamping bar 14 relative to the car body 8 can be changed in the width direction of the rail 6. In detail, positioning parts 18 for positioning and fixing the moving device 16 (support piece 17) supporting the tamping bar 14 are provided at positions close to the rail 6 and at positions far from the rail 6 on the frame body 15b of the support frame 15. Then, by positioning and fixing the support piece 17 of the moving device 16 by the positioning part 18 at a position close to the rail 6 or by the positioning part 18 at a position far from the rail 6, the support position of the moving device 16 and the tamping bar 14 relative to the car body 8 is changed in the width direction of the rail 6. In this way, by changing the support position of the tamping bar 14 relative to the car body 8 in the width direction of the rail 6, the crushed stone 3 can be compacted at multiple points in the width direction of the rail 6, and the compaction of the crushed stone 3 can be made effective.

(6) A motor is used as an actuator to vibrate the tamping bar 14. The motor can obtain maximum output in a relatively short time after starting to drive, so even if the tamping bar 14 is vibrated by the motor just before it is inserted into the track bed 4, the tamping bar 14 can be effectively vibrated when compacting the crushed stone 3. Therefore, the motor can be stopped except when it is necessary to vibrate the tamping bar 14, and the energy efficiency when operating the compaction track car 7 can be improved.

The above embodiment can be modified, for example, as follows: The above embodiment and the following modified examples can be combined with each other to the extent that no technical contradiction occurs.
The support positions of the moving device 16 and the tamping bar 14 relative to the vehicle body 8 in the width direction of the rail 6 are changed by positioning and fixing them at a positioning portion 18 located close to the rail 6 in the width direction of the rail 6, or by positioning and fixing them at a positioning portion 18 located farther from the rail 6, but the present invention is not limited to this.

For example, a position change mechanism may be provided that can continuously change the support position of the moving device 16 and the tamping bar 14 relative to the vehicle body 8 in the width direction of the rail 6, and the support position may be changed by driving the position change mechanism. In this case, compaction of the crushed stone 3 at positions close to the rail 6 and positions far from the rail 6 in the width direction can be automatically performed by controlling the drive of the position change mechanism and the moving device 16.

- The moving device 16 and the tamping bar 14 are provided to correspond to a pair of rails 6, but they may be provided to correspond to only one of the rails 6. Also, the moving device 16 and the tamping bar 14 are provided on both sides of the width of one rail 6, but the moving device 16 and the tamping bar 14 may be provided on only one side of the width of the rail 6.

Although a pair of tamping bars 14 are attached to one moving device 16, only one of the tamping bars 14 may be attached.
Instead of providing the moving device 16 with a conversion mechanism (arm portion 30, link 31, and support portion 32) for tilting the tamping bar 14 in the vertical direction, a hydraulic cylinder separate from the hydraulic cylinder 21 may be provided, and the tamping bar 14 may be tilted by using that separate hydraulic cylinder.

The tamping bar 14 does not necessarily need to be inclined in the vertical direction.
The vertical movement of the tamping bar 14 by the moving device 16 does not necessarily have to be performed in the same direction as the center line of the tamping bar 14. For example, the moving direction of the tamping bar 14 may be slightly inclined with respect to the center line of the tamping bar 14.

DESCRIPTION OF SYMBOLS 1...Ballast track 2...Road base 3...Crushed stone 4...Track bed 5...Sleepers 6...Rail 7...Compacting track car 8...Car body 14...Tamping bar 15...Support frame 15a...Leg 15b...Frame 16...Moving device 17...Support piece 18...Positioning part 19...Fixed column 20...Movable column 21...Hydraulic cylinder 22...Axis 23...Elongated hole 24...Reinforcing bar 25...Receiving part 26...Nut 27...Bracket 28...Pin 29...Vibration device 30...Arm 31...Link 32...Support part

Claims (3)

A compaction track car includes a vehicle body that travels along the rails of a ballast track, a tamping bar supported on the vehicle body, a vibration device that vibrates the tamping bar, and a moving device that moves the tamping bar in an up-down direction, and lowers the tamping bar to insert it into the track bed of the ballast track, and compacts the crushed stone that forms the track bed at a portion that receives the load from the rails through sleepers by vibrating the tamping bar.
The tamping bar is formed in a cylindrical shape that is elongated in a direction of movement by the moving device and that tapers downward,
At a lower end portion of a moving range of the tamping bar by the moving device, a lower end of the tamping bar is located below the sleepers and above the roadbed of the ballast track,
the moving device is provided with a conversion mechanism that converts a force acting in a direction of movement of the tamping bar when the tamping bar is to be moved downward at the lower end portion of its moving range into a force that tilts the tamping bar so that the lower end of the tamping bar approaches a position below the sleeper ,
The moving device includes a bracket that rotatably supports the tamping bar, and a hydraulic cylinder that expands and contracts in the vertical direction to move the bracket and the tamping bar in the vertical direction,
When the hydraulic cylinder expands and contracts to move the tamping bar up and down above the lower end portion of its moving range, the lower end of the hydraulic cylinder moves integrally with the bracket, thereby moving the tamping bar in the direction of its center line and in the vertical direction,
a lower end portion of the hydraulic cylinder is capable of moving vertically relative to the bracket when the tamping bar is moved to a lower end portion of its moving range by extension of the hydraulic cylinder;
The conversion mechanism tilts the tamping bar by rotating it relative to the bracket so that the lower end of the tamping bar approaches a lower position of the sleeper based on the downward relative movement of the lower end of the hydraulic cylinder relative to the bracket due to the extension of the hydraulic cylinder . The tamping bar is provided in plurality so as to be positioned on both sides of the sleeper in the extending direction of the rail,
The moving device moves the tamping bars located on both sides of the sleeper in the extending direction of the rail in a vertical direction,
2. The compaction track car of claim 1, wherein the conversion mechanism converts a force acting in the direction of movement of the tamping bars located on both sides of the sleeper in the direction in which the rail extends, when the tamping bars are to be moved downward at the lower end portion of their movement range, into a force that tilts the tamping bars so that the lower ends of the tamping bars located on both sides of the sleeper in the direction in which the rail extends approach the lower position of the sleeper. 3. The compaction rail car according to claim 1, wherein a support position of the tamping bar with respect to the car body can be changed in a width direction of the rail.