JPH0379757B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention centrally monitors the monitored contents of a plurality of monitored locations, such as level crossings, traffic lights, or important locations such as falling rocks and landslides, which are scattered along railway tracks. related to a device for

Conventional collective monitoring devices of this type are equipped with a monitoring signal generating device on the transmitting side that repeatedly generates a large number of monitoring signals having frequencies individually assigned to each monitored location and each monitored content, and on the receiving side. A monitoring circuit consisting of a bandpass filter, an amplifier that amplifies its output, a rectifying and smoothing circuit that rectifies and smoothes its output, and a monitoring relay that is energized by the output is installed for each monitoring signal, and the transmitting side and The receiving side is connected with a cable, and each monitored location is provided with an abnormality detection relay for each monitored content that drops when an abnormality occurs, and the operating contact of each abnormality detection relay is directly inserted in series with the cable, and each abnormality detection relay is installed for each monitored content. The drop point of the relay is connected in series to the cable via a bandpass filter that cancels the frequency components of the corresponding monitoring signal. At all times, each monitoring signal is sent from the transmitting side to the receiving side via the cable and the operating contacts of each failure detection relay, and each monitoring relay on the receiving side is operated, and when an abnormality occurs in the monitored location, the corresponding abnormality detection is performed. When the relay and the abnormality detection relay corresponding to the monitored content in which the abnormality has occurred fall, the corresponding band elimination filter is inserted into the cable via the falling contact of the abnormality detection relay, thereby reducing the frequency of the corresponding monitoring signal. The structure is such that the components are erased and the corresponding monitoring relay on the receiving side is dropped.

However, with this type of device, if the location to be monitored is a railroad crossing, for example, there are many types of things to be monitored, such as alarm failure, warning lamp failure, breakage of the cutoff rod, failure of the gate, etc. In the conventional device as described above, a monitoring signal generator on the transmitting side, a band cancellation filter at each monitored point, and a monitoring circuit on the receiving side are required for each monitoring signal, so as the number of contents to be monitored increases, The equipment was complicated, large, and expensive.

The present invention makes it possible to monitor a large number of monitored contents using a simple and inexpensive device by conveying abnormalities in monitored contents such as monitored equipment by voice, and to increase the number of monitored parts and monitored contents. The purpose is to provide a centralized monitoring device that is easy to change.

The present invention will be described below based on embodiments shown in the drawings.

In FIG. 1, 1 is a transmitting circuit, 2A, 2B...
2N is an abnormality detection circuit provided at each monitored point such as a railroad crossing, 3 is a verification circuit provided on the receiving side, and 4
is a monitoring circuit provided on the receiving side. A checking circuit 3 and a monitoring circuit 4 on the receiving side of the transmitting circuit 1 are electrically connected by a cable 5 laid through each monitored point along the railway track.

The transmitting circuit 1 includes a generator 6 for generating a reference signal of a frequency F ₀ different from that of an abnormality broadcasting signal to be described later, and an amplifier 7 for amplifying the reference signal and outputting it to the cable 5.
and always outputs the reference signal.

Each abnormality detection circuit 2A, 2B...2N includes an abnormality detection relay D1R, D2R...DnR, a representative relay FR that falls when any of the abnormality detection relays D1R, D2R...DnR, and one of the abnormality detection relays D1R, It is equipped with a signal generating circuit 8 which outputs an abnormality broadcasting signal corresponding to the relay when D2R...DnR falls, and an amplifier 9 which amplifies the output of the signal generating circuit 8.

Each abnormality detection relay D1R, D2R...DnR is
For example, if the abnormality detection circuit 2A is for the No. 1 level crossing, D1R in that circuit 2A is the broken No. 1 cutoff rod, D
2R is broken No. 2 shutoff rod, D3R is broken No. 1 alarm lamp, D4R is broken No. 2 alarm lamp, D5
R corresponds to each type of abnormality at the monitored location, such as a failure of the No. 1 alarm, and falls when a corresponding abnormality occurs.

Each abnormality detection representative relay FR is connected to the operating contacts of each abnormality detection relay D1R, D2R...DnR at the corresponding monitored site (the contact of each relay is connected to the corresponding (shown with the same reference numeral as the relay) are connected in series and are constantly energized. In addition, the operating contacts of each representative relay FR are inserted in series with cable 5,
The drop contact is connected to a cable 5 and an amplifier 9. Therefore, each representative relay FR is connected to each abnormality detection relay D1R, D2R, etc. of the corresponding monitored location.
If the DnR is operating, a reference signal from the transmitting circuit 1 is transmitted to the receiving side, and if either one falls, the output signal of the amplifier 9 is transmitted to the receiving side via the cable 5.

In the illustrated example, each signal generation circuit 8 is made of a commercially available voice synthesis LSI or a microcomputer, and each signal generation circuit 8 is made of a commercially available speech synthesis LSI or a microcomputer, and each of the abnormality detection relays D1 of the corresponding monitored location
The falling contacts of R, D2R...DnR are connected to the abnormality information input terminal. When any abnormality detection relay falls, an abnormality broadcasting signal corresponding to the abnormality mode corresponding to that relay is output. For example, if relay D1R falls, this abnormality broadcasting signal will indicate "breakage of No. 1 cutoff rod at No. 1 level crossing", and relay D
When 2R falls, the No. 2 barrier at the No. 1 level crossing breaks.
This signal is transmitted to the receiving side via the amplifier 9 and the falling contact of the abnormality detection representative relay FR. The abnormal broadcasting signal is repeatedly output.

Note that the abnormal broadcast signal does not necessarily have to be an audio signal that says "No. 1 barrier rod broken at No. 1 railroad crossing"; for example, "101" indicates "No. 1 railroad crossing" and "201" indicates "No. 1 railroad crossing breakage." ” and coded as “101
201" may be an audio signal.

The verification circuit 3 includes a narrowband filter 10 whose passband is the frequency F ₀ of the verification signal, an amplifier 11 that amplifies its output signal, a rectification and smoothing circuit 12 that rectifies and smoothes its output signal, and its output signal. It is equipped with a verification relay 13 that is energized by
Under normal conditions, the relay 13 operates because the check signal is input via the cable 5, but if any monitored location is abnormal, one of the abnormality detection representative relays FR falls and the check signal is not input. from,
Relay 13 falls. Although the contacts of the relay 13 are not shown, they are connected to an abnormality notification circuit and are used for abnormality notification using a buzzer, lamp, or the like.

The monitoring circuit 4 includes a parallel connection circuit 15 that connects the falling contact of the inspection relay 13 and the attenuator 14, an amplifier 16 that amplifies its output, and a speaker 17 to which the output signal is input. When the relay 13 is operating, the input signal is attenuated by the attenuator 14, and when there is an abnormality in the monitored area, the reference relay 13 falls, and the input signal is directly input to the amplifier 16 through its falling contact, thereby converting the input audio signal. It is broadcast by the speaker 17.

In the above-described centralized monitoring device, during normal operation, each representative relay FR is operated and the monitoring relay 13 of the inspection circuit 3 is operated by the inspection signal from the transmission circuit 1. At this time, since the input signal is attenuated by the attenuator 14 of the parallel connection circuit 15, no noise is broadcast from the speaker 17. However, the abnormality detection relay D1 of any detected location
If either R, D2R...DnR falls, the representative relay FR of the monitored location corresponding to that relay
falls, and the signal generating circuit 8 outputs a predetermined abnormality broadcasting signal. As a result, the verification relay 13 of the verification circuit 3 falls and an abnormality notification is performed by a buzzer or the like, and the parallel connection circuit 15 is short-circuited and the speaker 17 repeatedly broadcasts an abnormality corresponding to the abnormality broadcasting signal. Therefore, due to the abnormal broadcast, the staff member
It is possible to know the location where an abnormality occurs and the details of the abnormality.

FIG. 3 shows an embodiment of a central monitoring device using a commercial frequency of 100 volts AC as a reference signal.
This centralized monitoring device uses a transformer 21 as a transmitting circuit 20 that induces a commercial frequency into the cable 5, and transmits this commercial frequency to the receiving side via the cable 5 and each abnormality detection circuit 2A, 2B, . . . 2N. The verification circuit 22 then passes the input signal through a bandpass filter 24 whose passband is the commercial frequency, an amplifier 25 which amplifies its output, and a rectification and smoothing circuit 26 which rectifies and smoothes the output. The inspection relay 13 is always operated. Each of the abnormality detection circuits 2A, 2B...2N and the monitoring circuit 4 are the same as those in the apparatus shown in FIG.

In the centralized monitoring device shown in Fig. 3, under normal conditions, the commercial frequency is input to the verification circuit 22 and the verification relay 13 is operated, but if any of the abnormality detection relays falls, the receiving side receives the commercial frequency. Check relay 1 is activated by inputting an abnormal broadcast signal instead of
3 falls, and the monitoring circuit 4 repeatedly broadcasts an abnormality. Therefore, the staff member can know where the abnormality has occurred and its details.

FIG. 4 shows an embodiment of a centralized monitoring device using a DC voltage as a reference signal. This central monitoring device is
Except that a DC power supply 28 is used as the transmission circuit 27, the voltage of this DC power supply 28 is sent to the receiving side via the cable 5 and each abnormality detection circuit 2A, 2B...2N, and the checking relay 13 is operated by the DC voltage. The device is constructed similarly to the device shown in FIG.
Therefore, when this central monitoring device is normal, the verification signal (DC voltage) is input to the verification circuit 29 and the verification relay 13 is operated, but if any of the abnormality detection relays falls, the receiving side receives the Verification relay 1 is activated by inputting an audio signal instead of DC voltage.
3 falls, and the monitoring circuit 4 broadcasts the abnormality, thereby allowing the staff in charge to know the location where the abnormality has occurred and the details of the abnormality.

In each of the embodiments described above, when an abnormality occurs at two locations at the same time, the abnormality broadcasting signal from the monitored location near the receiving side is input to the receiving side, and the abnormality broadcasting from the monitoring site near the receiving side is only performed. An error broadcast signal from a monitored location near the transmitting side is not input, and the error broadcast is not made. In order to eliminate this drawback, a means is provided in the cable 5 in parallel with the operating contact of the representative relay FR to block the passage of the reference signal to each of the abnormality detection circuits 2A, 2B...2N, but to allow the passage of the abnormal broadcast signal. That's fine. In other words, in the embodiments shown in Figures 1 and 3, a band elimination filter for eliminating the frequency components of the reference signal is connected, and in the embodiment shown in Figure 4, a capacitor is connected to the cable in parallel with the operating contact of each representative relay FR. Just insert it in 5. In this way, if an abnormality occurs at multiple monitored locations at the same time, the representative relay FR will fall and the reference signal will not be input to the receiving side, but each abnormal broadcast signal will be input to the receiving side, and the monitoring circuit 4 will An abnormal broadcast will be made. In this case, multiple abnormal broadcasts are carried out at the same time, but it is extremely rare for three or more monitored locations to become abnormal at the same time. Since it is possible to distinguish between different types, there is no practical problem.

In addition, in each of the above-mentioned embodiments, each abnormality detection circuit 2
A, 2B...2N is provided with a signal generating circuit 8 to directly output an audio signal for abnormal broadcasting, but an audio signal generating circuit is provided in the monitoring circuit 4 and each abnormality detecting circuit 2A, 2B... 2N may output a code signal specifying an audio signal for abnormal broadcasting as an abnormal broadcasting signal, and the monitoring circuit 4 may decode the code signal to generate an audio signal for abnormal broadcasting.

As described above, the present invention combines an abnormality detection circuit provided at each monitored location with a plurality of abnormality detection relays that individually correspond to each monitored location at a monitored site and drop when the corresponding monitored location is abnormal. , a representative relay that falls when at least one of the abnormality detection relays falls, and an abnormality broadcasting signal generation circuit corresponding to the fallen abnormality detection relay;
an amplifier for amplifying the abnormal broadcasting signal, an operating contact of the representative relay is inserted in series with the cable, a drop contact is inserted between the amplifier and the cable, and the abnormal broadcasting signal is Since the monitoring circuit on the receiving side is equipped with a means for audibly broadcasting the abnormality according to the abnormality broadcasting signal input when the abnormality broadcasting signal is input, a large number of monitored contents can be centrally monitored with a simple and inexpensive device. However, the locations to be monitored and the contents to be monitored can be added and changed very easily. In addition, since a parallel connection circuit is provided on the input side of the broadcasting means in the monitoring circuit, in which the drop contact of the checking relay and the attenuator are connected in parallel, the input signal to the broadcasting means is attenuated by the attenuator during normal operation and is output from the speaker. The reference signal is broadcast at a low volume that does not become a noise, so that failures in the speaker system can be monitored, and in the event of an abnormality, the attenuator is disabled and the abnormality broadcast is performed correctly.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of a centralized monitoring device according to the present invention. FIG. 2 is a diagram showing one embodiment of the representative relay energizing circuit, and FIGS. 3 and 4 are diagrams each showing other embodiments of the central monitoring device. 1, 20, 27: Transmission circuit, 2A to 2N: Abnormality detection circuit, 3, 22, 29: Verification circuit, 4: Monitoring circuit, 5: Cable, 6: Verification signal oscillator, 8:
Signal generation circuit, 9: amplifier, 13: reference relay,
14: Attenuator, 15: Parallel connection circuit, 1
6: amplifier, 17: speaker, 21: transformer,
28: DC power supply, D1R to DnR: Abnormality detection relay, FR: Representative relay.

Claims (1)

[Claims] 1. A transmitting side and a receiving side are connected via a cable laid through a monitored point, the transmitting side is provided with means for transmitting an inspection signal to the cable, and each monitored point is provided with a means for transmitting a check signal to the cable, and a means is provided at each monitored point in series with the cable. Each of the inserted abnormality detection circuits is provided, and the receiving side further includes a checking circuit having a checking relay that is operated when the checking signal is input, and a checking circuit that detects the location to be monitored based on the output signal of the abnormality detection circuit. a monitoring circuit for monitoring an abnormality; the abnormality detection circuit includes a plurality of abnormality detection relays that individually correspond to each monitored content of a monitored location and drop when the corresponding monitored content is abnormal; A representative relay that falls when at least one of the abnormality detection relays falls, an abnormality broadcasting signal generation circuit corresponding to the fallen abnormality detection relay, and an amplifier that amplifies the abnormality broadcasting signal, and The operating contact of the representative relay is inserted in series with the cable, and the falling contact is inserted between the amplifier and the cable, and the monitoring circuit detects the abnormal broadcast signal when the abnormal broadcast signal is input. A collective monitoring device comprising means for broadcasting audibly an abnormal condition according to a signal, and a parallel connection circuit in which a falling contact of the inspection relay and an attenuator are connected in parallel on the input side of the broadcasting means.