JPS6018589B2 - 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 a short circuit between axles between rails is used as a means of detecting that a train is present within a certain section.

As a result, when a track maintenance vehicle travels alone or with a light trolley in tow, the axle short-circuit between the rails is insufficient, making it impossible to detect the vehicle and causing 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 axle short-circuits is small, and therefore the number of electrical circuits that short-circuit track circuits is small.The traction force is small and the vehicles are light, so the traction friction force that acts between the drive wheels and the wheels is reduced. 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 literary invention was made in view of the above problems,
The objective is to ensure that vehicle detection due to an axle short circuit in the track circuit is performed even if the vehicle is light.

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
5-1, 15-2 and wheels 14-1 to 14-4, a feeding wheel 12-1 for electrically destroying insulating inclusions between the wheels 14-1 to 14-4;
12-2. Also, wheels 14-1 of maintenance vehicle 1
- 14-4, minute 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. for,
Contactors 30 and 31 are provided. A pair of left and right feeder wheels 12-1 and 12-2 are each attached to a truck 201 connected to the front part of the maintenance vehicle 1.

The two carts are provided with a substantially T-shaped hanging frame 4 having a central frame 4a and a horizontal frame 4b. The suspension frame 4 is attached to a suspension frame receiver 2 attached to the front part of the maintenance vehicle 1 via a pin 3 so as to be rotatable within a horizontal plane. Horizontal frame 4b of suspension frame 4
A pair of left and right hanging beam arms 6-1 and 6-2 are attached to both end portions of the frame via bins 5-1 and 5-2 so as to be rotatable in a vertical plane. The wrap-like portions of these suspension arms 6-1, 6-2 are connected via pins 7-1, 7-2 by a suspension connecting member 8 having a hanging portion 8a. This suspension connecting member 8 is suspended by an air spring 101 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 1 at the lower portions of the ends of the suspension arms 6-1 and 6-2, respectively.
Support member 16-1 fixed via 1-1, 11-2
, 16-2 for rotation. When the vehicle is running, compressed air is supplied to the air spring 10, and the return springs 9-1, 9- connected between the central frame 4a and the suspension connecting member 8
2, the suspended connecting member 8 is pushed out downward.

As a result, the feeder wheels 12-1, 12-2 are connected to the rail 15-
1, 15-2. Also air spring 10
When the compressed air inside is discharged and the air spring 10 is set vertically, as shown in FIG. is pulled upward, thereby storing the feeder wheels 12-1 and 12-2 upward. When the maintenance vehicle 1 is running, the maintenance vehicle 1 is
Rotational movement in the e' direction (left and right rotation in the horizontal plane), f-
It performs rotational movement in the f' direction (left and right, rolling) and rotational movement in the gg direction (back and forth, pitching).

In response to these movements, the feeder wheels 12-1 and 12-2 always travel while maintaining contact with the rails 15-1 and 15-2. That is, as shown in the plan view of FIG. 2, while passing the curved rail, the suspension frame 4 of the bogie 20 rotates around the pin 3 of the suspension frame holder 2, and the feeding wheels 12-1, 12 12 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 4 It is desirable to provide restoring springs, 18-1, 18-2, dampers, etc. between both ends of the horizontal frame 4b 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 becomes loose, for example, to the left (direction f' in FIG. Figure m-m')
also leans accordingly.

On the other hand, the air spring 10 constantly feeds the wheels 12-1, 1.
2-2 are pressed against the rails 15-1, 15-2, the suspension connecting member 8 is kept substantially horizontal. Therefore, the horizontal extension of the suspension connecting member 8 (Fig. 4 n-n'),
The axes m-m' of the suspension frame 4 are in a positional relationship with each other, but this imitation is caused by the suspension arms 6-1, 6-2 and the pins 5-1,
Absorbed by 5-2, 7-1, 7-2. Further, when the maintenance vehicle 1 is placed in the front-rear direction (g-g' direction in FIG. 1), the suspension arms 6-1, 6-2 are
-1, 5-2 to absorb this inclination.

A slip ring 13 is attached to the axis of each of the feeder wheels 12-1 and 12-2 of the bogie 20, and a holding member 17 is attached to each of the support members 16-1 and 16-2 of the feeder wheels.
The brush 19 is attached so as to be in sliding contact with the slip ring 13 via.

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 the 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
An alternating current, direct current or pulsed current of, for example, about 20V-50A is applied from 4 to the rails 15-1, 15-2 through the conductor 41-1, the brush 19, the slip ring 13 and the feeder wheels 12-1, 12-2, respectively. flows. Furthermore, the current from the wheels 15-1 and 15-2 is applied to the wheels 14-1 to 14-1 of the maintenance vehicle.
14-4, each passes through the slip ring 24, the brush 23, and the conducting wire 41-2, and returns to the current control circuit 44. As a result, the discharging action of the current flowing between the rails 15-1, 15-2 and the wheels 14-1 to 14-4 of the maintenance vehicle 1 effectively destroys the insulating inclusions therebetween. Therefore, between the rails 15-1 and 15-2, the wheels 14-1 to 14-2
14-4 and the axle 25 to form a track circuit, sufficient signal current flows between the rails through the axle 25 as indicated by the dotted line '' in FIG. Furthermore, a pair of wheel-shaped guide contacts 30 and 31 are attached to each of the wheels 14-1 to 14-4 of the maintenance vehicle 1 of this embodiment 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. Respective contacts 30, 31
has an insulator 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 via a holding member 33 so as to be in sliding contact with the contacts 30 and 31. Therefore, as shown in FIG. 7, the peak voltage is 140 V,
A pulse current of about 4 MA passes through the conductor 42-1, the brush 34, and the contact 30, respectively, to the wheels 14-1 to 14-.
It flows to each of the 4.

Further, the current from the wheels 14-1 to 14-4 returns to the pulse generator 45 through the other contact 31. 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 the wheels 14-1 to 14-4. Due to this unevenness, while the maintenance vehicle 1 is running, the wheel surface is
Since the rails roll under locally high surface pressure, insulating inclusions such as rust and oil films on the rail surface are mechanically destroyed. Therefore, the contact resistance between the wheels and the rails is sufficiently reduced by 4.0 mm, and the contact resistance between the rails 15-1 and 15-2 is
4 and the axle 25 to form a track circuit. Note that the pulse generator 45 and the above-mentioned current control device 44 operate with power from a power supply device 46 mounted on the maintenance vehicle 1. In addition, the contacts 30, 31 and the wheel 14-
A similar effect can be obtained by flowing direct current or alternating current between the points 1 to 14-2.

Furthermore, toothed wheels may be used as the contacts 30, 31, and wire brushes, carbon brushes, etc. may be used as the wheels 14-
1 to 14-4 may be configured to make sliding contact. In addition, as shown in FIG.
15-2. When current is supplied in parallel to the wheels 14-1 to 14-4, the current concentrates and flows only on the side where the resistance between the rail and the wheel is low, and the current flows between the rail and the wheel on the other side. Insulating inclusions may not be effectively destroyed.

For this reason, as shown in FIG. 8, independent left and right current control devices 44a and 44b may be provided to configure separate circuits to destroy the insulating inclusion between the rail and the wheel. Regarding the contacts 30 and 31, as shown in FIG.
A pair may be provided for 3, 14 and 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 embodiment is applicable. Even by using the above, it is possible to obtain the effect of lowering the contact resistance with the rail wheel, and it is possible to reliably detect a vehicle due to an axle short circuit in the track circuit.

Further, if both types are used together as in the embodiment, vehicle detection by the track circuit can be further ensured, and the reliability of the operation of the stepping circuit breaker and the traffic signal can be improved. As described above, the present invention provides a conductive contact that moves or spreads over the wheel surface of a railway vehicle, and a current is passed between the conductive contact and the wheel to form fine irregularities on the rotating surface of the wheel. This unevenness mechanically destroys the insulating inclusion between the rail and the wheel to short-circuit the axle of the track circuit.

Therefore, even if the vehicle is relatively light, such as a maintenance vehicle or a repair vehicle, vehicle detection due to an axle short circuit in the track circuit can be reliably performed.
The reliability of operation of level crossing circuit breakers and traffic lights can be improved.

[Brief explanation of drawings]

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 circuit diagrams showing a modification of FIG. 7. In addition, in the symbols used in the drawings, 1...
・Maintenance vehicle, 14-1 to 14-4...Wheel, 1
5-1, 15-2...Rail, 25...Axle, 30,3
1...Contact, 34...Brush, 45...
...It is a pulse generator. Figure 1 Figure 2 Figure 3 Figure 5 Figure 9 Figure 4 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] 1. The railway vehicle is provided with a conductive contact that rolls or slides on the rotating surface that contacts the rail of the wheel of the railway vehicle, and a current is passed between the conductive contact and the wheel to cause the wheel to rotate. A track circuit in which minute irregularities are formed on the surface, and the insulating inclusions between the rail and the wheels are mechanically destroyed by the irregularities, thereby achieving an axle short circuit of the track circuit in a predetermined section of the track. Short circuit resistance reduction device.