JPS6018590B2 - Track circuit short circuit resistance reduction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a short-circuit resistance reducing device for a track circuit installed on a railway vehicle, and is particularly suitable for application to a track maintenance vehicle of a light vehicle.

A track circuit that utilizes an axle short circuit between rails is used as a means of detecting the presence of a train within a certain section.

Conventionally, when a track maintenance vehicle travels alone or while towing a lightweight trolley, the axle short-circuit between the rails is insufficient, making it impossible to detect the vehicle, which sometimes causes the level crossing circuit breakers and traffic lights to not operate. The cause is that the weight of the maintenance vehicle is small and the electrical contact resistance between the wheels and the wheel is large.
Because the number of connected vehicles is small, the number of short-circuit axles is small, and therefore the number of electrical circuits that short-circuit track circuits is small, and the traction force is small and there are light vehicles, so the traction friction force acting between the drive wheel and the wheel is It is considered that the insulating inclusions such as rust and oil film on the surface of the seal cannot be destroyed because of the small size. If the track circuit becomes unable to detect a vehicle due to such causes, and the level crossing circuit breakers and traffic lights become inoperable, there is a risk that a level crossing accident or a rear-end collision will occur. The present invention has been made in view of the above problems, and includes:
The purpose of this system is to ensure that even if there are light vehicles, vehicle detection due to a short circuit in the axle of the track circuit can be performed reliably.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a track maintenance vehicle showing an embodiment of the present invention.

As shown in FIG. 1, the maintenance vehicle 1 of this embodiment has a rail 1
Feeder wheel 12-1 for electrically destroying insulating inclusions between 5-1, 15-2 and wheels 14-1 to 14-4;
Equipped with 12-2. Also, the wheels 14-1 of the maintenance vehicle 1
14-4, each of which states, ``Fine irregularities are formed on the wheel surface to mechanically destroy the insulating inclusions between the rails 15-1, 15-2 and the wheels 14-1 to 14-4. In order to
Contacts 30.31 are provided. A pair of left and right feeder wheels 12-1 and 12-2 are each attached to a truck 20 connected to the front part of the maintenance vehicle 1.

The truck 20 includes a substantially T-shaped suspension frame 4 having a central portion 4a and a horizontal frame 4b. The suspension frame 4 is attached to a suspension frame holder 2 attached to the front part of the maintenance vehicle 1 via pins 3 so as to be freely rotatable in a horizontal plane. A pair of left and right suspension arms 6-16-2 are attached to both ends of the ratchet frame 4b of the suspension frame 4 via pins 5-1 and 5-2 so as to be rotatable in a vertical plane. The pivoting ends of these suspension arms 6-16-2 are connected via pins 7-1, 7-2 by a suspension connection member 8 having a hanging portion 8a. This suspension connecting member 8 is suspended by an air spring 10 provided between its hanging portion 8a and the tip of the central frame 4a of the suspension frame 4 so that it can be expanded and contracted. Feeder wheels 12-1 and 12-2 are provided with insulating members 11-1 and 12-2, respectively, at the lower part of the covered end of the suspension arm 6-16-2.
Support members 16-1, 16- fixed via 11-2
2 is rotatably supported. When the vehicle is running, compressed air is supplied to the air spring 10, and the suspension connection member 8 is moved downward against the return springs 9-1 and 9-2 connected between the central frame 4a and the suspension connection member 8. being pushed out. As a result, the feed wheels 12-1, 12-2 are connected to the rails 15-1, 15-2.
pressed against the surface of Further, when the compressed air in the air spring 10 is discharged and the air spring 10 is contracted, as shown in FIG. 5, the suspension connecting member 8,
The suspension arm 6-16-2 is pulled upward, and thereby the feeder wheels 12-1, 12-2 are retracted upward. When the maintenance vehicle 1 is running, it undergoes rotational movement in the e-e' direction (left and right rotation in a horizontal plane) and rotational movement in the f-r direction (
side-to-side/rolling) and rotational movement in the gg direction (back-and-forth/
pitching).

Against these movements, the feeder wheels 12-1, 12-2 always travel while maintaining contact with the rails 15-1, 15-2. That is, as shown in the plan view of FIG. 2, while passing through the curved rail, the suspension frame 4 of the bogie 20 rotates around the pin 3 of the suspension frame receiver 2, and the feeding wheels 12-1, 12- 2 travels while reliably following the curved portions of the rails 15-1 and 15-2. Note that when traveling on a straight rail, the flange portion of one of the feeder wheels 12-1, 12-2 may travel while being pressed against one of the rails 15-1 or 15-2, so the suspension frame It is desirable to provide restoring springs 18-1, 18-2 or a damper between both ends of the horizontal frame 4b of No. 4 and the maintenance vehicle 1.

In addition, as shown in the front view of Fig. 3 and the perspective view of Fig. 4,
When the maintenance vehicle 1 is tilted, for example, to the left (direction f' in FIG. Figure m-m')
I feel nostalgic accordingly.

On the other hand, due to the air spring 101, the constantly supplied wheels 12-1,
12-2 is pressed against the rails 15-1, 15-2, the suspension connecting member 8 is kept substantially horizontal. Therefore, the horizontal extension axis of the suspension connecting member 8 (n-n' in Figure 4) and the axis (m-m') of the suspension frame 4 are in a mutually interlocking positional relationship, but this tear Suspension arm 6-16-2 and pin 5-
Absorbed by 1,5-2,7-1,7-2. Further, when the maintenance vehicle 1 is tilted in the longitudinal direction (g-g' direction in FIG. 1), as shown in FIG. 5, the suspension arm 6-! 6-2 rotates around pins 5-1 and 5-2 to absorb this inclination.

A spring 13 is attached to the center portion of each of the feeder wheels 12-1 and 12-2 of the trolley 20, and a holding member 17 is attached to each of the support members 16-1 and 16-2 of the feeder wheels. A brush 19 is mounted in sliding contact with the spring 13.

On the other hand, on the side of the maintenance vehicle 1, as shown in the partial vertical cross-sectional view of FIG. A brush 23 is attached to a support arm 32 fixed to the frame 26 via a holding member 22 so as to be in sliding contact with a slip ring 24. Therefore, as shown in the electrical circuit diagram of FIG. 7, the current control device 4 mounted on the maintenance vehicle 1
4, an AC, DC or pulse current of, for example, about 20V-5M passes through the conductor 41-1, the brush 19, the slip ring 13 and the feeder wheels 12-1, 12-2, respectively, to the rails 15-1, 15-2. flows to

Furthermore, the current from the rails 15-1 and 15-2 is applied to the wheels 14-1 to 14-4 of the maintenance vehicle and the slip rings 2.
4. Returns to the current control circuit 44 through the brush 23 and the conductor 41-2, respectively. As a result, rails 15-1, 15-2
The discharging action of the current flowing between the wheels 14-1 to 14-4 of the maintenance vehicle 1 effectively destroys the insulating inclusions therebetween. Therefore, the rails 15-1 and 15-2 are reliably short-circuited via the wheels 14-1 to 14-4 and the axle 25 to form a track circuit, and a sufficient signal current is supplied as indicated by the dotted line in FIG. It flows between the rails through the axle 25. Furthermore, the wheels 14-1 to 14- of the maintenance vehicle 1 of this embodiment
A pair of wheel-shaped conductive contacts 30 and 31 are attached to each of the wheels 4 so as to rotate in contact with the wheel surface.

As shown in FIG. 6, the contactor 30 or 31 is rotatably attached to a support arm 32 attached to the truck frame 26 via bearings 37, 38. Each contact 30,3
1 has an insulating groove 36 embedded in its shaft 35, and is electrically insulated from the body of the maintenance vehicle 1. On the other hand, a brush 34 is attached to the maintenance vehicle 1 through a holding member 33 so as to be in intimate contact with the contacts 30 and 31. Therefore, as shown in FIG. 7, for example, a peak voltage of 140
A pulse current of about 4 V is applied to the wheels 14-1 to 1 through the conductor 42-1, the brush 34, and the contact 30, respectively.
It flows to each of 4-4. Further, the current from the wheels 14-1 to 14-4 passes through the other contactor 31 to the pulse generator 4.
Return to 5. As a result, fine irregularities are formed on the surfaces of the wheels 14-1 to 14-4 due to the discharge action of the current flowing between the contacts 30, 31 and each of the wheels 14-1 to 14-4. Due to these unevenness, while the maintenance vehicle 1 is running, the wheel surface is locally transferred to the rails 15-1, 15-2 with high contact pressure, so that the rust and insulating inclusions such as oil film on the rail surface are mechanically damaged. destroyed. Therefore, the contact resistance between the wheels and the rails becomes sufficiently small, and the rails 15-1 and 15-2 are reliably short-circuited via the wheels 14-1 to 14-4 and the axle 25, forming a track circuit. be done. Note that the pulse generator 4
5 and the above-mentioned current control device 44 are operated by a power supply from a power supply device 46 mounted on the maintenance vehicle 1. In addition, the rear tentacle 3
A similar effect can be obtained by flowing direct current or alternating current between the wheels 14-1 and 14-1 to 14-4.

Furthermore, toothed wheels may be used as the contacts 30 and 31, and wire brushes, carbon brushes, etc. may be used as the wheels 14-1.
It may be configured so that it is brought into contact with the surface of 14-4. In addition, as shown in FIG.
5-2. When current is supplied in parallel to the wheels 14-1 to 14-4, the current flows concentratedly only on the side where the resistance between the rail and the wheel is low, and on the other hand, the current flows only on the side where the resistance between the rail and the wheel is low. Insulating inclusions may not be effectively destroyed. For this reason, as shown in FIG. 8, the left and right independent current control devices 44a,
44b may be provided, each forming a separate circuit to destroy the insulating inclusion between the rail and the wheel. Further, as for the contacts 30 and 31, as shown in FIG. 9, one pair may be provided for each pair of wheels 14-1 to 14-2 or 14-3 to 14-4.

In this case, the axle 25 becomes the current path. Note that only one of the electrical insulation inclusion destruction method using the feeder wheels 12-1 and 12-2 and the mechanical insulation inclusion destruction method using the contacts 30 and 31 of the above-mentioned embodiment is applicable. Even by using this method, it is possible to obtain the effect of reducing the contact resistance between the rail and the wheel, and it is possible to reliably detect a vehicle due to an axle short circuit in the track circuit. In addition, if both methods are used together as in the example, vehicle detection by the track circuit can be made even more reliable.
The reliability of operation of level crossing circuit breakers and traffic lights can be improved. As described above, the present invention attaches a conductive wheel that rolls in pressure contact on a rail to a railway vehicle, and flows an electric current between the conductive wheel and the wheel of the vehicle via the rail, thereby creating a connection between the rail and the wheel. The axle short-circuit of the track circuit was attempted by electrically destroying the insulating inclusions in the track circuit.

Therefore, even if the vehicle is a relatively light maintenance vehicle or a repair vehicle, vehicle detection due to an axle short circuit in the track circuit can be reliably performed, and the reliability of the operation of the level crossing circuit breaker and traffic signal can be improved. In addition, the conductive wheel is attached to the vehicle through a link structure that freely rotates in the horizontal and vertical planes, and a pressure means is provided so that the conductive wheel is pressed and rolled on the rail surface. Therefore, even if the vehicle yawns, rolls, or pitches while the vehicle is running, the conductive wheels are pressed against the rail surface in perfect contact with the rail surface, thus achieving a stable insulation breakdown effect even while the vehicle is running.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a track maintenance vehicle to which the present invention is applied;
The figure is a plan view of the maintenance vehicle when passing through a curved rail, Figure 3 is a front view of the maintenance vehicle when rolling, Figure 4 is a perspective view of the maintenance vehicle when rolling, Figure 5 is a side view, and Figure 6 is a partial vertical sectional view of the wheel part of the maintenance vehicle, Figure 7 is an electrical circuit diagram, and Figure 8 is a partial longitudinal sectional view of the wheel part of the maintenance vehicle.
9 and 9 are electrical circuit diagrams showing a modification of FIG. 7. In addition, in the symbols used in the drawings, 1...
・Maintenance vehicle, 2... Suspension frame holder, 3... Pin, 4... Suspension frame, 6-1, 6-2...
Suspension arm, 5-1, 5-2... pin, 8... suspension connection member, 10... air spring, 11-1, 11-
2...Feeding wheel, 13...Slip ring, 14-
1 to 14-4...Wheel, 15-1, 15-2...Rail, 19...Brush, 23...Brush, 24...Slip ring, 25...Axle, 44...Current control device be. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] 1. A first link member that is rotatable in a horizontal plane is connected to a railway vehicle, and second and third link members that are rotatable in a vertical plane are attached on both sides of the first link member in the rail width direction. A pair of conductive wheels are rotatably supported on the second and third link members so as to roll on the rail surface, and the pressurizing means is used to apply pressure to the second and third link members through the second and third link members. A conductive wheel is configured to be in pressure contact with a rail surface, and a current is passed between the conductive wheel and the wheel of the railway vehicle via the rail, thereby removing an insulating inclusion between the rail and the wheel. A device for reducing short circuit resistance of a track circuit, which achieves an axle short circuit of a track circuit in a predetermined section of the track by electrically breaking the track.