JPH05294243A - Railroad crossing security device - Google Patents

Abstract

PURPOSE:To prevent the generation of an unalarmed state caused by the mixed contact of a control circuit for connecting a power line to a control relay in a railroad crossing control element (a starting point detecting device) so as to prevent the generation of a railroad crossing accident caused by the unalarmed state, thereby improving reliability. CONSTITUTION:In a railroad crossing protection device, a DC/DC converter 11 is provided between a cable 3 and a first railroad crossing control element 1. Independent d.c. power formed of the DC/DC converter is thereby provided on the first railroad crossing control element side, so that the generation of an unbalanced state can be prevented positively even if a short circuit is generated by the mixed contact or the like of a circuit for connecting a power line to a reaction relay, and reliability is improved remarkably compared to an existing railroad crossing security device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for railroad crossings used in railroad crossings, and more particularly to a railroad crossing controller for detecting the approach of a train and controlling a railroad crossing alarm, an electric railroad crossing breaker or the like. Of safety equipment for level crossings with improved reliability. Specifically, level crossing controller (starting point detection device)
In order to prevent a crossing accident due to such a cause, it is possible to prevent the alarm-free state from occurring due to the contact of the control line that connects the power line and the control relay, and to improve the reliability of the operation. Security device for railroad crossings.

[0002]

[Background Art] Conventionally, when a railway crossing or the like is detected, the approach of a train is detected to control a crossing alarm (alarm sound generator, warning light, train traveling direction indicator, etc.), an electric crossing gate, etc. A level crossing security device using a level crossing controller is installed.

[0003]

2. Description of the Related Art This safety device for railroad crossings comprises a railroad crossing controller (starting point detection device) for detecting the approach of a train to the railroad crossing, a relay for holding the operating state of the railroad crossing, a control line for the relay, and a relay control line for these. It is composed of a power line for supplying power to each part. However, in the conventional safety device for railroad crossings, if the relay control line is touched due to rattle, galvanic corrosion, etc., the relay will continue to operate regardless of whether or not the train is approaching. There is no alarm. Next, a conventional leveling safety device will be described with reference to the drawings.

FIG. 4 is a functional block diagram showing an example of the main configuration of a conventional leveling security system.
In the figure, 1 is a first level crossing controller, 1a and 1b are detectors thereof, 1c is an oscillator, 1d is a control relay, and 2 is a first
Protector, 3 is a cable, 4 is a first reaction relay, 5 is a second protector, 6 is a second railroad crossing controller, 6a is its detecting portion, 7 is a second reaction relay, and 8 is DC power supply, 9 is the third
Is a railroad protector, R is a rail, and T is a train position.

In FIG. 4, the first level crossing controller 1
Is connected to the railroad crossing equipment box side by a cable 3 including a power supply line for supplying power from the DC power supply 8 and a control line for operating the first reaction relay 4. On the other hand, the second railroad crossing controller 6 is provided in the vicinity of the railroad crossing, and in FIG. 4, acts as an end point detection device.

When the train passes, the second level crossing controller 6 also operates the second reaction relay 7 to stop the alarm sound of the level crossing alarm, turn off the alarm light, raise the breaker, etc. To generate a control signal. However, when the control line in the cable 3 is touched (short-circuited) due to a rode damage, an electric corrosion, or the like, the first crossing controller 1 which is a starting point detection device is provided with the first reaction relay regardless of whether or not the train approaches. 4 continues to operate.

Therefore, for example, the train position T indicated by a broken line
As described above, even when the train actually passes through the first railroad crossing controller 1 (even when it enters between the detection units 1a and 1b), the detection signal indicating the approach of the train is not generated. As a result, the alarm sound of the level crossing alarm is not generated, and the alarm light is not turned on. Similarly, the electric railroad crossing breaker does not operate and is in a non-interrupted state, which may cause a serious accident.

[0008]

SUMMARY OF THE INVENTION According to the present invention, such inconveniences in the conventional safety device for railroad crossings, that is,
When the control line inside the cable touches due to ratching, galvanic corrosion, etc., the starting point detection device (first railroad crossing controller) will have a reaction relay (first reaction relay) regardless of whether or not the train is approaching.
Solves the inconvenience that the vehicle continues to operate and the detection signal is not generated even when a train actually enters, which may lead to a serious accident. By providing a separate power supply for the controller reaction relay that is driven by a signal, it is possible to reliably prevent the occurrence of a serious accident in the railroad crossing. More specifically, by separating the power supply to the level crossing controller and the power supply for driving the reaction relay, the reaction relay will operate and fall if a contact accident such as a control line should occur. It is an object of the present invention to provide a safety device for railroad crossings in which a railroad crossing alarm continues to be in an alarm state, so that a conventional non-alarm state is prevented and a serious accident does not occur.

[0009]

According to the present invention, there is provided a first railroad crossing controller having a detector installed on a rail, a second railroad crossing controller having a detector installed on a rail, and a first railroad crossing controller.
The first relay controlled by the level crossing controller, and the second relay
A second relay controlled by the level crossing controller, and a cable connecting between the first level crossing controller and the level crossing equipment box, and a DC power source supplies power to the first and second level crossing controllers. In the safety device for railroad crossings, which detects the approach of a train and controls a railroad crossing alarm, an electric railroad crossing gate breaker, etc., a DC / DC controller provided between the cable and the first railroad crossing controller.
This is a configuration including a DC converter.

[0010]

[Embodiment] Next, regarding the safety device for railroad crossings of the present invention,
The embodiment will be described in detail with reference to the drawings.

FIG. 1 is a functional block diagram showing an embodiment of the main configuration of a safety device for level crossings according to the present invention. Reference numerals in the figure are the same as those in FIG. 4, 11 is a DC / DC converter, and 12 is a fourth protector.

As shown in FIG. 1, in the safety device for level crossings according to the present invention, the first level crossing controller 1 which is a starting point detecting device is driven by a condition signal from the first level crossing controller 1. As a power source for the first reaction relay 4 to be operated, DC
A / DC converter 11 is provided. Also, DC / DC
A fourth protector 12 is provided in order to protect the output side of the converter 11 from lightning surges and the like.

In the first level crossing controller 1, D
If the C / DC converter 11, the first protector 2, the fourth protector 12, etc. are integrated, the setting work, the inspection / maintenance work, etc. can be facilitated and the space can be saved. Become. As shown in FIG. 1, the power supply to the first railroad crossing controller 1 (DC power supply 8 as in the conventional case) and the DC / DC converter 11 as the drive power supply for the first reaction relay 4 are separately provided. By installing it on the cable 3
Even if there is a touch accident on the control line inside, the first reaction relay 4
Is prevented from falling into a non-alarm state as in the past, and the safety is improved by the so-called fail-safe theory.

FIG. 2 is a diagram showing an equivalent circuit of the first reaction relay 4 and the DC / DC converter 11 in the safety device for railroad crossings of the present invention. Reference numerals in the drawing are the same as those in FIG. 1, and reference numeral 14 denotes equivalently contact by contact or the like by an electric contact.

As shown in the equivalent circuit of FIG. 2, in the safety device for railroad crossings of the present invention shown in FIG. 1, the DC / DC converter 11 is an independent DC power source. Therefore, when the contact portion 14 is in the closed state, the relay of the first level crossing controller 1 that is the starting point detection device is in either the on / off state (regardless of whether or not the train approaches), The first reaction relay 4 falls. Next, DC / D
An example of the C converter 11 will be described.

FIG. 3 is a cross sectional view of the safety device for level crossing D shown in FIG.
It is a functional block diagram which shows one Example of the C / DC converter 11. In the figure, 21 is an input filter circuit, 22
Is a starting circuit, 23 is an overcurrent detection circuit, 24 is a power switch circuit, 25 is a drive circuit, 26 is a control circuit overvoltage detection circuit, 27 is a photocoupler, 28 is a control circuit, 2
9 is an output rectifying / smoothing circuit, and T1 and T2 are transformers.

As shown in FIG. 3, in the DC / DC converter 11, the DC input side and the DC output side are cut off in a direct current manner by the transformers T1 and T2 and the photocoupler 27. Then, through the transformer T1, the AC component generated on the DC output side is reconverted into the DC component by the output rectifying / smoothing circuit 29, and the DC voltage is output.

[0018]

According to the present invention, an independent DC power source composed of a DC / DC converter is provided on the side of the first level crossing controller (starting point detection device). Therefore, even if a short circuit occurs on the side of the first railroad crossing controller due to contact of the line connecting the power supply line and the reaction relay, the alarmless state is reliably prevented from occurring. Many excellent effects such as significantly improved reliability can be obtained as compared with.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing an embodiment of the main configuration of a safety device for railroad crossings according to the present invention.

FIG. 2 is a diagram showing an equivalent circuit of a first reaction relay 4 and a DC / DC converter 11 in the safety device for railroad crossings of the present invention.

3 is a functional block diagram showing an embodiment of a DC / DC converter 11 of the safety device for railroad crossings shown in FIG. 1. FIG.

FIG. 4 is a functional block diagram showing an example of a main part configuration of a conventional leveling security system.

[Explanation of symbols]

 1 1st crossing controller 1a and 1b The detection part 1c Oscillator 1d Control relay 2 1st protector 3 Cable 4 1st reaction relay 5 2nd protector 6 2nd crossing controller 6a Its detection part 7 2nd reaction relay 8 DC power supply 9 3rd protector 11 DC / DC converter 12 4th protector

Claims (1)

[Claims] 1. A first unit having a detection unit mounted on a rail.
Railroad crossing controller, a second railroad crossing controller having a detector installed on the rail, a first relay controlled by the first railroad crossing controller, and a first railroad crossing controller controlled by the second railroad crossing controller. A second relay and a cable connecting between the first level crossing controller and the level crossing equipment box are provided, and power is supplied from a DC power source to the first and second level crossing controllers to detect approach of a train. A crossing security device for controlling a crossing alarm, an electric crossing gate, etc., characterized by including a DC / DC converter provided between the cable and the first crossing controller. Security device.