JPH07112176B2 - Train approach warning device for workers - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a train approach warning for a worker, which is used to notify a worker who is performing track maintenance work on a railroad track or in a railroad track, of approach of a train. It relates to the device.

(Background of the Invention) A transmission system for transmitting a signal using a rail as an electric circuit is widely used in the field of railway signals, and the required frequency, voltage, etc. are selected and used depending on the application.

This transmission circuit is usually called "track circuit", and unlike ordinary communication lines, this electric circuit has no fear of line breaks, cross-links, etc.
It is widely used for various signal transmissions required for railway operation, etc., as it has favorable characteristics as a transmission line and can economically construct a highly reliable transmission system.

In this transmission system, if the power supply can be used as it is at low frequencies below the commercial frequency, it is relatively easy to increase the power supply, and impedance matching between the transceiver and track circuit is not particularly considered. Can also be sufficiently transmitted.

However, when transmitting a signal with a frequency higher than the voice frequency band, it is necessary to place importance on transmission efficiency, and impedance matching between the track circuit and the transmitter / receiver is performed as accurately as possible to achieve high efficiency, and , A low distortion transmission system is constructed, but based on the construction and the usage of such a transmission system, the transmission system is inevitably fixedly installed, and a portable or mobile device. It was difficult to say.

On the other hand, there is no end to accidents in which a worker who performs track maintenance work on or inside a railway track comes into contact with the train without noticing the approaching train. Accurately reporting devices are extremely important for safety work, but in constructing this train approach warning device for workers, it is necessary to effectively use rails as the transmission lines of the transmission system necessary for the configuration of the device. This is extremely advantageous in constructing an economical and highly reliable transmission system, including the fact that the laying of lines can be omitted. In this case, the position of the transmission / reception end must be an arbitrary required position determined by the situation of the work site, and therefore, even if the transmission system is permanently installed, it cannot be effectively used.

Therefore, it is possible to install it on the work site promptly at the time required to start the work, quickly remove it at the end of the work, and use a rail composed of a portable transceiver that can be reliably used by workers other than electrical workers. The transmission system has been strongly demanded as a transmission means that constitutes a train approach warning device for workers to ensure the safety of daily track maintenance work.

(Object of the invention) The object of the present invention is to solve the above-mentioned problems and to be easily used in any place of a railroad track, without considering impedance matching with a track circuit, and to use a signal even if a rail is used. It is an object of the present invention to provide a train approach warning device for workers, which efficiently performs transmission and is economical and has good workability.

(Features of the Invention) In order to achieve the above object, the present invention according to claim 1 provides
Train approach alarm device for workers, which includes a train detection device at a starting point for detecting approach of a train, a train detection device at an end point for detecting passage of a train, and an alarm device for alerting a worker to approach of a train. That is, the transmission device that outputs a carrier signal of a predetermined frequency according to the presence or absence of a train detection signal from the train detection device at the starting point, and receives a carrier signal from the transmission device,
A receiving device is provided which operates the alarm device depending on whether or not the carrier signal is received, and stops the operation of the alarm device in response to a train detection signal from the train detection device at the end point.
In order to form an unbalanced transmission circuit of the carrier signal between the rail and the ground, one end of the transmission output side of the transmission device and one end of the reception input side of the reception device are respectively connected to one side or both sides of a pair of rails of a railway line. However, the other end on the transmission output side of the transmission device and the other end on the reception input side of the reception device are grounded to the ground, and the present invention according to claim 2 receives from the transmission device over rail insulation. When a carrier signal is transmitted to the device, both ends of the rail insulation are short-circuited by capacitors.

(Embodiment of the Invention) FIG. 1 is a configuration diagram of a train approach warning device for workers using a rail, which is an embodiment of the present invention.

In a general train signal type track in which the transmission system according to the present invention is used, a rail 1 which is a negative feeder of a direct current for supplying to a train is galvanically insulated by a rail insulation 2. The impedance bond 3 feeds a direct current to form a closed section of the train signal, and the length of this section is usually about 800 to 1200 m.

The transmission device 4 of the train approach warning device for workers of this method is a train detection device 5 at a starting point at a position separated by a required distance from a work site in a direction in which a train comes at an arbitrary work site.
It is attached to the rail 1 on one side together with (prepared separately), and the receiving device 6 together with the train detection device 7 at the end point (prepared separately) is located at a position near the work site in the train leaving direction. Also attached to the rail 1.

FIG. 2 is an explanatory view showing a method of attaching the transmitter 4 and the receiver 6 to the rail 1.

The transmitting device 4 and the receiving device 6 are both for input / output.
A rail mounting bracket 9 is provided at the end of one wire of the lead wire 8 on the hot side, whereby one wire of the lead wire 8 is easily connected to the rail 1.

The other wires on the cold side of the lead wire 8 of the transmitter 4 and the receiver 6 are grounded by a grounding rod or the like.

The frequency band of the carrier signal used for the train approach warning device for workers of the present invention has a vacant band that can be used as a usable frequency band in order to avoid the signal frequency band and the medium frequency broadcasting frequency band already used in the track circuit. Use a certain 2-2.5MHz band.

The transmitter 4 constantly sends the modulated carrier signal of 2 to 2.5 MHz to the rail 1 through the insulating capacitor 10 (about several μF). Train approaching device 5 at the starting point
Is operated, train approach information is transmitted to the transmission device 4,
The transmission device 4 stops the transmission of the carrier signal that is constantly transmitted for a fixed time.

The carrier signal is transmitted by rail 1 and insulated capacitor 11
Although it is constantly received by the receiving device 6 via (about several μF), when it detects a state in which the carrier signal cannot be received for a certain period of time, the receiving device 6 holds the state itself and outputs the state at the same time. The warning signal is sent to the warning device 12, and the warning device 12 issues a train approach warning to the worker.

When the train passes the work site, the train detection device 7 at the end point
Operates and the information is transmitted to the receiving device 6. Based on this information, the receiving device 6 releases the self-holding state due to the detection of the fixed time interruption of the carrier signal at the previous time, and the alarm device 12
Automatically stops the train approach warning.

Experiments on actual railroad lines have confirmed the practicality of the unbalanced transmission system between the one-sided rail 1 and the ground according to the present invention.

Further, the potential noise is limited to the induction of the commercial frequency and the radiation of the medium-wave broadcast radio wave, and it is possible to easily cope with the practical application of the device.

If the work site hits the end of the train signal block section where the impedance bond 3 is installed,
As shown in the figure, by connecting the transmitting device 4 and the receiving device 6 to the balanced midpoint 13 of the impedance pound 3, respectively, the signal is transmitted by the rails 1 on both sides, and the transmission level of the carrier signal is improved. You can

In addition, depending on the work site, when it is necessary to transmit the carrier signal beyond the train signal blocking section, short-circuit both ends of the rail insulation 2 of the rail 1 on one side to be used as a transmission circuit with a capacitor so that the rail insulation 2 can be obtained. Can be bypassed.

When the railroad track is a double track, the transmitters 4 can be installed in both directions centering on the work site, and thus the transmission system can be easily and economically configured between arbitrary places by the present transmission system. It becomes possible.

In this way, by effectively using the rails 1 on one side or both sides as a signal transmission circuit, the laying of the contact line and the line condition A practical transmission system can be configured such that confirmation can be omitted.

(Effect of the invention) As described above, according to the present invention of claim 1,
A transmission device that outputs a carrier signal of a predetermined frequency according to the presence or absence of a train detection signal from the train detection device at the starting point, and a carrier signal from the transmission device is received, and an alarm is issued depending on whether or not the carrier signal is received. A receiver for activating the device and a receiver for stopping the operation of the alarm device by the train detection signal from the train detection device at the end point, and a transmitter for making the rail / ground an unbalanced transmission circuit for the carrier signal. One end of the transmission output side and one end of the reception input side of the receiving device are connected to one side or both sides of a pair of rails of the railway line, respectively, and the other end of the transmission output side of the transmitting device and the other receiving input side of the receiving device are connected. Since the end is grounded, it can be easily used anywhere on the railroad track, and efficiently perform signal transmission using the rail without considering impedance matching with the track circuit. Door can be, economic efficiency, it is possible to improve the workability.

Further, according to the present invention as set forth in claim 2, when a carrier signal is transmitted from the transmission device to the reception device over the rail insulation, both ends of the rail insulation are short-circuited by capacitors, so that a long distance is provided. Transmission can take place.

[Brief description of drawings]

FIG. 1 is a block diagram of a train approach warning device for workers using one side rail and grounding, which is one embodiment of the present invention, and FIG. 2 is a view showing a transmitter / receiver device connected to the rail in one embodiment of the present invention. FIG. 3 and FIG. 3 are configuration diagrams of a train approach warning device for workers, which is another embodiment of the present invention and uses both side rails and grounding. 1 ... Rail, 2 ... Rail insulation, 3 ... Impedance bond, 4 ... Transmitter, 5 ... Train detector, 6
...... Reception device, 7 …… Train detection device, 8 …… Lead wire,
9: Rail mounting bracket, 10, 11: Insulation capacitor, 12
…… Alarm device, 13 …… Equilibrium midpoint.

Claims (2)

[Claims] 1. A train detection device at a starting point for detecting approach of a train, and a train detection device at an end point for detecting passage of a train,
A train approach alarm device for a worker, comprising an alarm device for alarming a worker approaching a train, which outputs a carrier signal of a predetermined frequency according to the presence or absence of a train detection signal from the train detection device at the starting point. And a carrier signal from the transmitter, and activates the alarm device depending on whether or not the carrier signal is received, the alarm signal of the alarm device is detected by the train detection signal from the train detector at the end point. In order to provide an unbalanced transmission circuit of the carrier signal between the rail and the ground by providing a receiving device for stopping the operation, one end of the transmitting output side of the transmitting device and one end of the receiving input side of the receiving device are respectively connected to the railway line. A train approach warning device for workers, characterized in that it is connected to one or both sides of the pair of rails, and the other end of the transmission output side of the transmission device and the other end of the reception input side of the reception device are grounded. 2. A train approach for workers according to claim 1, wherein when transmitting a carrier signal from the transmitting device to the receiving device over the rail insulation, both ends of the rail insulation are short-circuited by capacitors. Alarm device.