JP2002337687A - Vehicular approach alarm device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular approach alarm device that is easily installed, has a small size of field work installing type, and is excellent in remote detection. SOLUTION: In this system, a train current detecting sensor is attached on a rail in a foot portion through a mount magnet, and directly connected from an output portion of the sensor to an amplifier input portion of an amplifier for the sensor built in a computing processing device through a low noise cable. A result processed by the computing processing device is sent from a computing output portion to an alarm input portion as a signal through a connecting cable, thereby sounding an alarm. The system is simplified, and the sensor can be attached on the rail in the foot portion, and a detecting device is a portable type.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle approach warning device for protecting a track maintenance person from a train accident, particularly in a track inspection near a conventional track and along a field work.

[0002]

2. Description of the Related Art Conventionally, a vehicle approach warning device using a sensor is disclosed in Japanese Patent Application Laid-Open No. Hei 8-72720, a portable train progress judging device, a Japanese Patent Application Laid-Open No. 6-183346, a train approach detecting system and a train approach detecting device. In addition, an AE sensor attached to a rail detects rail vibration during traveling of a vehicle, and wirelessly communicates a signal by radio or the like.

[0003]

In these methods, the AE sensor and the receiver / alarm have to be installed separately, which is a large-scale device, and is 10 minutes from the work place.
This was inconvenient because it was necessary to go to the sensor at a position about 100 m away from the sensor. Further, since the detected signal is communicated by radio waves or the like by radio or the like, there has been a problem that it is difficult to put it to practical use in addition to the problems of communication reliability and cost.

[0004] It is an object of the present invention that it can be easily mounted,
It is an object of the present invention to provide a portable vehicle approach warning device which is small in size, is small in size, and is excellent in detection of vehicle approach.

[0005]

In order to achieve the above object, in a vehicle approach warning device according to the present invention, a train current detection sensor is mounted on a rail near a work site via a magnet, and the output of the sensor is processed by an arithmetic processing unit. This is a system that is connected to an amplifier built in and sounds an alarm based on the result processed by the arithmetic processing unit. Since the system can be simplified, the sensor can be mounted on a rail as close as possible to the work site, and the detection device will be portable.

[0006]

In the vehicle approach warning device configured as described above, a very sensitive train current detection sensor detects a small current generated from a train to a rail while the vehicle is running, and a detected signal is transmitted through a low noise cable. The signal is sent directly to the amplifier of the portable detection device, and the signal is processed inside the arithmetic processing unit.

[0007] By repeating this process at regular intervals, it is determined that the threshold value has been exceeded, and a processing result is sent to an alarm to sound the alarm.
Ensure the safety of track maintenance personnel working near the track.

At this time, the high-sensitivity train current detection sensor can be mounted on a rail as close as possible to the work site, and the detected signal is directly input to a portable detection device at hand, so that the whole system is Simplified,
In addition, the time for mounting the sensor is greatly reduced.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. FIG. 1 is an overall configuration diagram of a vehicle approach warning device showing an embodiment of the present invention, wherein 1 is a detector, 2 is a low noise cable, and 3 is a detection device. The detector 1 includes a train current detection sensor 1a and a mount magnet 1b. Train current detection sensor 1a used in this embodiment
Is a high-sensitivity vibration acceleration sensor that measures rail vibration generated by rolling of wheels and contact of rails while the vehicle is running, and generates a weight near the rail by a magnetic weight placed inside the vibration acceleration sensor. It can detect the electric current flowing through the rail by catching the fluctuation of the magnetic field. The low noise cable 2 is a cable connecting the detector 1 and the detection device 3. The detection device 3 includes an arithmetic processing device 4 and an alarm 5. Inside the detection device 3, an amplifier 4a of a train current detection sensor is incorporated.

The method of mounting the detector 1 on the rail is as follows. First, the train current detection sensor 1a and the mount magnet 1b are firmly connected and fixed, and the mount magnet 1b is mounted and fixed on the rail near the feet of the worker.
An arithmetic processing unit 4 outputs the sensor output of the attached detector 1
It is directly connected to the sensor amplifier 4a built in the inside of the vehicle, and detects the electric signal due to the train current generated when the vehicle approaches and the rail vibration generated due to the contact between the wheel and the rail. The signal is captured directly. The fetched data is detected by an electric signal detection filter circuit 4b1 and a mechanical signal detection filter circuit 4b.
2 and the arithmetic processing unit 4c, the system is configured to catch the approach of the vehicle and sound the alarm 5. The details of these filter circuits 4b1 and 4b2 and the arithmetic processing unit 4c will be described in detail below.

The arithmetic unit 4 in this embodiment is divided into a filter circuit 4b1 for capturing an electric signal and a filter circuit 4b2 for capturing a mechanical vibration, and their outputs are taken into an arithmetic processing unit 4c to execute an alarm process. This embodiment shows an example of a two-stage warning in which a train current that becomes an electrical detection signal that can be detected early is warned as a caution signal, and an emergency evacuation warning is issued for a mechanical sudden approach. The electric signal filter circuit 4b1 includes a band-pass filter 6a, a rectifier circuit 6b, a resonance filter 6c, a rectifier circuit 6d, a smoothing filter 6e, and an A / D converter 6f. Since it occurs at a pitch N times, it is effective to extract a beat at this frequency by passing through a resonance filter having a frequency N times the fundamental wave, and determine the level by the arithmetic processing unit 4c. This makes it easier to distinguish the electrical signal from the mechanical disturbance. On the other hand, the mechanical vibration filter circuit 4
b2 is a resonance filter 7a, a rectifier circuit 7d, and a smoothing filter 7 that capture a frequency component that matches the resonance frequency of the orbit.
e, an A / D converter 7f, and a resonance filter 7a
The mechanical processing unit 4c determines the mechanical rail vibrations captured in step (1). This determination can effectively achieve the distinction from the disturbance by designating the range of the increase rate that increases above a certain threshold value. There are several orbital resonance frequencies,
Among them, by picking up the highest possible ones, it is possible to avoid relatively low-frequency disturbances such as tie tampers used in construction work, and by observing the continuous increase, other mechanical disturbances (for example, rails) (Such as maintenance polishing work) can be detected separately.

In the above embodiment, a high-sensitivity vibration acceleration sensor is used as a train current detection sensor, but a magnetic field detection sensor (electric sensor) wound with a coil may be used. In this case, since mechanical vibration is not picked up, it is easy to remove mechanical disturbance. In this case, it is preferable to use both the electric sensor and the vibration acceleration sensor in order to detect a sudden approaching mechanical vibration and to execute a two-step alarm. FIG. 2 shows the contents of the detection device in the case of the two-sensor system.
In the present embodiment, the arithmetic unit 14 includes a filter circuit 14b1 for electric signals, a filter circuit 14b2 for mechanical vibrations, and an arithmetic processing unit 14c. The output of the train current detection sensor 11 is electrically connected via an amplifier 14a. The output of the vibration acceleration sensor 12 is supplied to a signal filter circuit 14b1 via an amplifier 14a2.
b2 is independently taken in. Therefore, compared with the embodiment of FIG. 1, a portion for detecting a beat component N times the fundamental wave of the train current is not required, and the circuit configuration is simplified, and at the same time, the S / N ratio with respect to mechanical disturbance can be greatly increased. it can.

[0013]

Since the present invention is constructed as described above, it has the following effects.

In the vehicle approach warning device according to the present invention, the detector 1 is attached to the rail at the foot of the observer near the work site, and a signal can be sent directly to the detection device 3 via the low noise cable 2. There is no need to separately install the sensor in a different place, and the entire system can be simplified.

Further, since the train current is detected by the detector, the approach of the vehicle from a distance can be detected, and the work can be interrupted and evacuated more safely with a margin when the vehicle approaches.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of the present embodiment.

FIG. 2 is an overall configuration diagram showing another embodiment of the present invention.

[Explanation of symbols]

 1. Detector 1a. 11. Train current detection sensor 1b. Mount magnet 2. 2. Low noise cable 13. Detection device 4. 14． Arithmetic processing unit 4a. 14a. 14a2. Amplifier 4b1. 14b1. Filter circuit for electric signal 4b2. 14b2. Filter circuit for mechanical vibration 4c. 14c. Arithmetic processing unit 5. 15. Alarm

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Mitsuaki Hashimoto 794, Higashitoyoi, Katsumatsu-shi, Yamaguchi Prefecture Hitachi Kasado Engineering Co., Ltd. F-term (reference) 5H161 AA01 BB17 BB20 DD11 DD43 FF01 FF07 GG01 GG11 GG24 MM02 MM12 NN07 PP06 PP12

Claims (5)

[Claims] 1. A vehicle approach warning device for detecting approach of a running vehicle and sounding an alarm device, comprising: a train current detection sensor attached to a rail; and a detection device including a processing unit for catching the vehicle approach. A vehicle approach warning device characterized by the above-mentioned. 2. The vehicle approach warning device according to claim 1, wherein a harmonic component of a train current generated during running of the vehicle is detected inside the detection device. 3. A vehicle approach warning device according to claim 2, wherein an arithmetic processing section inside the detection device detects a beat of some harmonic components generated during traveling of the vehicle and catches the approach of the vehicle. A vehicle approach warning device characterized in that: 4. The vehicle approach warning device according to claim 1, further comprising: a vibration acceleration sensor for detecting vibration of the rail, detecting an approach of the vehicle from a distance by the train current detection sensor, and detecting the vibration acceleration. A vehicle approach warning device wherein a sudden approach of a vehicle is detected by a detection sensor and a two-stage warning is issued. 5. The vehicle approach warning device according to claim 4, wherein the vibration acceleration detection sensor is shared as the train current detection sensor.