JPH0541975Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a level crossing safety device that detects the passing of a vehicle and activates level crossing safety equipment such as an alarm and a cutter.

[Conventional technology]

BACKGROUND OF THE INVENTION Level crossing safety equipment installed on railway tracks, such as sill gates and level crossing alarms, are controlled by a configuration of relay contacts provided in track circuits. A track circuit is a circuit that uses rails as part of an electric circuit, and detects the presence of a train within the track circuit by short-circuiting the rails using the axle of the vehicle, and outputs this output. This is an electric circuit for train detection that directly or indirectly controls railway signaling devices, switch devices, and other safety devices.

[Problem that the invention attempts to solve]

By the way, when a vehicle enters the track circuit, there is a problem with track short circuits, especially in the case of level crossing controllers used as train detectors for level crossing control, the current at the time of rail short circuits is low, and more recently train braking devices Synthetic brake shoes have come into use, and their powder adheres to the rail treads, making short circuits more likely to occur. Depending on the location, short circuit failures may also occur due to the influence of volcanic ash fall or fallen leaves. When a short-circuit failure occurs, the train detection operation becomes impossible, and there is a risk that there will be no warning, no warning, or no warning, resulting in a risk of a railway crossing accident.

The purpose of this project is to provide a level crossing safety device that operates the level crossing safety equipment by receiving signals constantly emitted from the ATS onboard equipment installed on the train, in addition to the train detection function through the track circuit.

[Means for solving problems]

In order to achieve the above purpose, the level crossing safety device according to the present invention has a combination of onboard equipment and ground equipment, and detects the passage of a train and uses level crossing safety equipment such as a level crossing alarm and a cutter. The onboard device is an ATS type onboard device mounted on a train, and has an onboard device 11, which constantly transmits a specific frequency while the train is running. The ground equipment includes a receiving coil 1, a filter 2,
It has an AC Schmitt circuit 4, a detector 6, and a detection relay 7, and the receiving coil 1 is installed as a beacon 8 on a rail or sleeper in a track, and is installed on a train passing over the beacon 8. The AC signal emitted from the onboard child 11 is received without contact, and the received signal is output to the filter 2. The filter 2 converts the frequency passage range of the received signal into the AC signal emitted from the onboard child 11. The AC Schmitt circuit 4 is limited to a certain range including the frequency of
The AC Schmitt circuit 4 verifies the intensity of the input wave of the received signal output from the filter 2, shapes the AC wave having a certain intensity or more into a square wave, and sends it to the wave detector 6.
The detector 6 detects the square wave of the received signal input from the AC Schmitt circuit 4 and outputs the DC output to the detection relay 7. It has a detection output of 1, and provides a train detection output to the control circuit of the level crossing safety equipment.

[Effect]

When the train's ATS on-board equipment passes directly above the receiving coil installed on the track as a ground coil,
A receiving coil receives a 105kHz AC signal emitted from an on-board device for a certain period of time, and this AC signal is input to an alternating current (AC) Schmitts circuit through a filter.The AC Schmitts circuit verifies the intensity of the input wave, and then The above input wave is converted and shaped into a square wave, the waveform is detected and rectified, and a DC signal is used to operate a detection relay to control the level crossing safety equipment.

In addition, when the track circuit is operating normally, the level crossing safety equipment operates according to the command from the original level crossing controller, which is used as a train detector for controlling the level crossing. In the event of a failure, the level crossing safety system of the present invention will control the system.

〔Example〕

Embodiments of the present invention will be described below using figures.

FIG. 1 is a block diagram showing an embodiment of the present invention. The ground equipment of the proposed level crossing safety system includes a receiving coil 1, a filter 2 whose passband is set to 105±5kHz, an amplifier 3 that amplifies the AC signal that has passed through the filter 2, and a signal level of the received AC signal. AC Schmitt circuit 4 that converts and shapes only signals exceeding a certain level into square waves, a power amplifier 5 that amplifies the square waves, and a detector 6 that detects the square waves. It consists of a detection relay 7 that operates with a DC output signal.

An example of a specific circuit diagram of the block circuit shown in FIG. 1 is shown in FIG. In the circuit shown in Fig. 2, between the receiving coil 1 and the filter 2, and between the power amplifier 5 and the detector
A transformer coupling is used between the two, and the circuit is configured so that it is as difficult as possible to operate on the train detection side when one of the circuit components fails.

The AC Schmitt circuit 4 has a reference signal for testing an input signal having a certain strength or more, and compares the level of this reference signal with the level of the input signal.
It is configured to shape the waveform and output it only when it receives an input signal that exceeds the level of the reference signal. The outline of waveform shaping is shown in FIG. The detection relay 7 has operation contacts S ₁ and S ₂ and is operated by the detection output. Normally, the capacitor C is charged through the falling contact S ₁ of the relay 7, and once the input signal is received, the detection output is activated. When the relay 7 operates, the charging voltage of the capacitor C is passed through the coil of the relay 7 by the lifting contact _S1 , and after the operation, the resistor R of the relay 7 and the capacitor C
The time constant (T∝CR) determined by the capacity of is used as a slow release time element, and during this time the relay operates (lifts up) and provides a reliable train detection output to the control circuit of the level crossing safety device through the falling contact _S2 of relay 7. It is something.

In Fig. 3, the receiving coil 1 is
Using the casing used for the ATS-S type ground element, it is housed inside and fixed to the rail or sleeper in the track as the ground element 8. In addition, a series of electric circuits 2 to 6, a detection relay 7, and related equipment are installed on a steel pipe pillar 9 of a railroad crossing, etc., and a relay circuit 7 ₂ (second ) is wired to the control circuit of the level crossing safety device (both not shown).

In the example, the ATS installed on the train 10
- Always 105kHz from the onboard device 11 of the S type onboard device
The signal emitted from the onboard coil 11 is received by the receiving coil 1 when the vehicle 10 passes over the ground coil 8.

The passband of the received signal of filter 2 is 105±5kHz
, and only signals included in this frequency band, that is, train detection signals, are detected, and the input signals are amplified by the amplifier 31.
Next, the level of the input signal is checked in the AC Schmitt circuit 4 as shown in FIG. In this case, as shown in Figure 5a, the ON level range of the AC Schmitt circuit 4 is set within the range of the + side e level and the - side e level during one cycle of the input sine wave, and the sine waveform exceeding that range is generated. The drive output of the relay is ensured by converting it into a rectangle and expanding the pulse width as shown in FIG. 5b. The output from the AC Schmitt circuit 4 generated while the train passes through the range of the receiving coil is input to the power amplifier 5 and amplified, and then detected by the detector 6, and the detection relay 7 is operated with the DC power. . The detection output time t is set as t = L/V (where V: train speed L: response distance) as shown in Figure 4b, and during this time t (approximately 0.02 seconds), as shown in Figure 2. The contact S ₁ of the detection relay 7 is lifted, and after the time T set as the slow release time elapses, the charge stored in the capacitor is discharged and the relay contact S ₁ falls (FIG. 4c). Through the operation of this relay 7, each device of the level crossing safety device is reliably controlled and performs a predetermined operation.

[Effect of idea]

As described above, according to the present invention, the train can be sensed without contact by the receiving device installed as a wayside by effectively utilizing the signals constantly transmitted from the ATS onboard device installed on the train. is possible,
In order to reliably control the level crossing safety equipment using this received signal, even if the level crossing controller in the track circuit causes an accident such as a short circuit, it will detect the passing of a train and cause a level crossing accident without warning. can be prevented from occurring.

Especially when using the present invention, train-specific
Receives a 105kHz AC signal through a filter,
Furthermore, since we have taken measures such as detecting the signal after level verification and driving the relay, there is no malfunction due to noise from induced lightning, train current flowing through the rails, etc.Furthermore, the received input signal is powered by the level verification (AC Schmitt). AC signal processing is performed up to amplification, and after the detection circuit, it consists of a time element circuit using a capacitor and relay contacts, so it is possible to prevent noise signals from passing through the filter and passing the level test. Even when receiving signals from the ATS onboard device, this kind of noise does not continue to occur until the relay is activated, which means that the train can be reliably detected only when a signal is received from the ATS onboard device without malfunctioning. Able to control equipment.

Furthermore, since the receiving coil has no resonance, even if the proposed device is out of order, there will be no effect on the onboard equipment from the ground wire side, and even when installing the proposed device, it will be possible to use the existing equipment. It can be applied without major changes. Furthermore, as shown in the configuration shown in Figure 2, all received input signals are processed as AC signals, so even if a failure occurs in the parts that make up the proposed device, the train detection side will not operate. Therefore, warning-sustaining accidents are less likely to occur, and the original level crossing warning operation is not interfered with.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention.
FIG. 2 is a circuit diagram showing a specific configuration, FIG. 3 is an explanatory diagram showing the installed state of the proposed device, FIG. 4 a is a diagram showing a train detection input signal waveform, and b is a detection output waveform diagram.
FIG. 5c is a diagram showing the relay operating time, FIG. 5a is a diagram showing the input waveform of the Schmitt circuit, and FIG. 5b is a diagram showing the output waveform. 1... Receiving coil, 2... Filter, 4...
AC Schmitt circuit, 6...detection circuit, 7...detection relay, 8...ground element.

Claims (1)

[Scope of claim for utility model registration] A level crossing safety device that has a combination of onboard equipment and ground equipment, and that detects the passing of a train and operates level crossing safety equipment such as a level crossing warning device and a sill gate. The onboard device is an ATS type onboard device mounted on the train, and has an onboard device 11, which constantly transmits an AC signal of a specific frequency while the train is running. The ground equipment includes a receiving coil 1, a filter 2,
It has an AC Schmitt circuit 4, a detector 6, and a detection relay 7, and the receiving coil 1 is installed as a beacon 8 on a rail or sleeper in a track, and is installed on a train passing over the beacon 8. The AC signal emitted from the onboard child 11 is received without contact, and the received signal is output to the filter 2. The filter 2 converts the frequency passage range of the received signal into the AC signal emitted from the onboard child 11. The AC Schmitt circuit 4 is limited to a certain range including the frequency of
The AC Schmitt circuit 4 verifies the strength of the input wave of the received signal output from the filter 2, shapes the AC wave with a certain strength or more into a square wave, and outputs the waveform to the wave detector. The detector 6 detects the square wave of the received signal input from the AC Schmitt circuit 4 and outputs the DC output to the detection relay 7. The detection relay 7 detects the detection output of the detector 6. A level crossing safety device characterized in that it provides a train detection output to a control circuit of a level crossing safety equipment.