JPH0740834A - Train approaching alarm device - Google Patents

Abstract

PURPOSE:To provide a train approaching alarm device capable of surely identifying the approach of a train to sound an alarm to an operator without relying upon human sensitivity. CONSTITUTION:A signal, from a first vibration sensor 21 fitted to a rail 3 lower part, is passed to a first band pass filter passing only a vibration frequency band due to the travel of a train 4 transmitted via a rail 3, and a signal, from a second vibration sensor 22, is passed to a second band pass filter passing vibration transmitted to the rail due to rail maintaining work, etc., excluding the vibration frequency band due to the travel of the train 4. Also when a differential signal between signals passed the first and second band pass filters becomes a given level or more, the discrimination circuit of a train approach alarm device 1 identifies the approach of a train to sound an alarm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a train approach warning device which is effective for ensuring the safety of track maintenance workers and ensuring train operation during track maintenance work on railroad tracks.

[0002]

2. Description of the Related Art At the time of track maintenance work on railroad tracks, it is obligatory to arrange a guard to ensure the safety of train maintenance workers and to ensure train operation. It instructs workers to suspend work and wait outside the track.

Although the monitoring work by the monitoring staff refers to the train schedule in the track maintenance section, the train schedule is often changed due to weather conditions, etc. Therefore, the monitoring is closely linked with the train dispatcher. Even trainers could not judge the passage of all trains by relying on the train schedule alone, so the watchman's judgment was all visual and auditory confirmation.

[0004]

However, in the monitoring work that relies on the human visual sense and hearing,
Track maintenance work is often performed at night when there are few train operations, and it is difficult to complete perfection of such night surveillance work that is inferior in visibility and may cause drowsiness. Also, various trains operate frequently even at night, and the speed of progress of this train is quite fast, so even if the monitoring is temporarily neglected, the train will quickly approach the track maintenance work site. is there. In addition, track maintenance workers concentrate on work with the consciousness that a trainer alerts the approach of the train, and the approaching sound of the train may be distracted by the work sound, so the train maintenance worker himself It was difficult to monitor his approach.

Further, when identifying a train approaching from a distance, in addition to the visibility being poor at night, the visibility is further deteriorated due to climatic conditions such as rainfall and snowfall, and the track is curved to make it visible. If there is an obstacle that obstructs the train, it will be more difficult to identify the approach of the train. In addition, there is a risk that human error such as neglecting monitoring will often occur in monitoring relying on human senses, and the track maintenance worker will die despite the fact that there is an observer. The accident of doing has happened for a long time.

[0006] Therefore, it is an object of the present invention to provide a train approach warning device capable of promptly and surely identifying approach of a train and issuing an alarm to a worker without relying only on human senses. And

[0007]

In order to achieve the above-mentioned object, a train approach warning device of the present invention comprises a first vibration sensor and a second vibration sensor which are mounted on a rail on which a train travels. 1st band pass filter which passes only the vibration frequency band by the traveling of the train transmitted through the rail with respect to the signal from the 1st vibration sensor, and the vibration frequency by the traveling of the said train with respect to the signal from said 2nd vibration sensor A second band-pass filter that excludes the band and passes the vibration frequency band transmitted to the rail by the track maintenance work, and the first band
Discriminating circuit for discriminating that a train is approaching when the difference signal between the signal passing through the band pass filter and the signal passing through the second band pass filter exceeds a predetermined level, and the discriminating circuit operates. Is provided with an alarm means for issuing an alarm.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a usage state of a train approach warning device of the present invention, in which 1 is a train approach warning device of the present invention,
2 ₁ The first vibration sensor, 2 ₂ The second vibration sensor attached to the rail 3 under which is mounted on the rail 3 bottom 4 is a train traveling on the rail 3.

The vibration sensor detects the mechanical vibration applied to itself, the acceleration such as impact, and converts it into an electric signal, and the size, acceleration detection direction, allowable acceleration, detectable frequency band, etc. There are various types of vibration sensors, acceleration sensors, etc. depending on the type and characteristics. Then, the first vibration sensor 2 ₁ and the second vibration sensor 2 ₂ can detect the unique vibration frequency transmitted through the rails as the train travels,
In addition, the one that can withstand the great shock that the rail receives when the train runs is used.

[0010] The first vibration sensor 2 _1, the lower part of the train approaching direction of the rail 3 than the track maintenance work site, as shown in FIG. 2, is mounted detachably with engaging members such as bolts. Then, the second vibration sensor 2 ₂ has the rail 3 in the opposite direction to the first vibration sensor 2 ₁ with the track maintenance work site in between.
It is detachably attached to the bottom of the. The first vibration sensor 2 ₁ and the second vibration sensor 2 ₂ may be separated from each other by about 10 meters depending on the track maintenance work site. In the present embodiment, the first vibration sensor 2 ₁ and the second vibration sensor 2 ₂ are set so as to detect vibration in the vertical direction while being attached to the rail 3.

Signals from the _first vibration sensor 2 ₁ and the second vibration sensor 2 ₂ are input to the train approach warning device 1, and the first approach sensor 2 ₁ receives the signals.
For the signal from the vibration sensor 2 _{1 of} the above, a first bandpass filter (not shown) that passes only the vibration frequency band due to the traveling of the train transmitted through the rail 3 is used, and the second vibration sensor 2 _For the signal from 2, the second band-pass filter that excludes the vibration frequency band transmitted by the train that travels through the rail 3 and passes the vibration frequency band that is transmitted to the rail 3 mainly by track maintenance work on the roadbed. (Not shown) is used.

When setting the pass band characteristic of this band pass filter, it is necessary to determine that the vibration frequency due to the running of the train is slightly different depending on the speed and type of the train.

Further, the vibration transmitted to the rail by the track maintenance work includes the vibration frequency in the same band as the vibration frequency band peculiar to the train running to some extent. Therefore, from the signal passed through the first band pass filter, If the vibration transmitted to the rail is not subtracted, the vibration due to the track maintenance work may be mistaken as the vibration due to train running.

Therefore, by inverting the phase of the signal that has passed through the second bandpass filter and adding this to the signal that has passed through the first bandpass filter, the signal from the signal passed through the first bandpass filter is subjected to a track maintenance work. The vibration component transmitted to the rail is subtracted, so that the train approach warning device 1 can take out only the signal due to the running of the train.

Since the magnitude of the signal due to the running of the train is considered to be approximately proportional to the distance between the train and the vibration sensor, the level of the signal due to the running of the train when the train approaches to a dangerous distance is set. A threshold value (threshold level) is set, and when this value is exceeded, an appropriate warning means such as a buzzer, a horn, and a warning light is activated to issue a warning to the observer and the worker.

Incidentally, an amplifier or the like for amplifying a minute electric signal from the vibration sensor is appropriately used in the train approach warning device 1, and its explanation is omitted in the above-mentioned embodiment.

Further, the train approach warning device 1 of the present invention uses a rechargeable battery (not shown) as a power source, so that it can be easily adapted to the movement of the work site.

[0018]

As described in detail above, according to the train approach warning device of the present invention, the signal from the first vibration sensor mounted on the rail is transmitted only through the rail in the vibration frequency band due to traveling of the train. Pass the signal from the second vibration sensor through the first band pass filter and exclude the vibration frequency band due to the traveling of the train transmitted through the rail, and pass the vibration transmitted to the rail by the track maintenance work, etc. When the difference signal between the signal passing through the first bandpass filter and the signal passing through the second bandpass filter is equal to or higher than a predetermined level, the determination circuit determines that the train is approaching. For the observers who must identify and approach the train visually and audibly during maintenance work on the railroad track, because the identification and warning means give an alarm. Not only will it help you know when a car is approaching, but in the unlikely event that an observer cannot warn you when a train is approaching, you can compensate for human error and issue a warning to track maintenance workers quickly and reliably. Therefore, even under bad conditions such as bad weather, late at night, and under noisy conditions, it is very effective for ensuring the safety of track maintenance workers and ensuring train operation.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a usage state of a train approach warning device of the present invention.

FIG. 2 is an explanatory view showing a mounting state of a vibration sensor in the train approach warning device of the present invention.

[Explanation of symbols]

1 Train approach warning device 2 ₁ First vibration sensor 2 ₂ Second vibration sensor 3 Rail 4 Train

Claims (3)

[Claims] 1. A first vibration sensor and a second vibration sensor mounted on a rail on which a train travels, and a vibration frequency of a train traveling transmitted through the rail in response to a signal from the first vibration sensor. A first band-pass filter that passes only the band, and a second band-pass that passes the vibration frequency band transmitted to the rail by track maintenance work etc. by excluding the vibration frequency band due to running of the train with respect to the signal from the second vibration sensor A filter, and a discrimination circuit for discriminating that a train is approaching when a difference signal between the signal passed through the first band pass filter and the signal passed through the second band pass filter is equal to or higher than a predetermined level, A train approach warning device, comprising warning means for issuing a warning when a discrimination circuit operates. 2. The first vibration sensor is positioned in the train approaching direction, and the second vibration sensor is positioned on the opposite side of the first vibration sensor with a track maintenance work in between. Train approach warning device according to 1. 3. The train approach warning device according to claim 1, wherein the first vibration sensor and the second vibration sensor are detachable from the rail.