JP6310197B2 - Alarm transmitter - Google Patents

Description

  The present invention relates to an alarm transmission device for wirelessly transmitting an alarm.

  Conventionally, as for the work in a track performed between trains, safety is ensured by arranging train guards 82 and 83 as shown in FIG. An outer train guard 82 is disposed near the track away from the work site 81 in the train traveling direction, and a local train guard 83 is disposed near the work site 81. When the outside train guard 82 recognizes the approach of the train 2, the train guard 82 notifies the local train guard 83 of the approach of the train by the work radio 86. The local train guard 83 who has received the communication gives a signal to the work manager 84 that the train is approaching. Upon receiving the signal, the work manager 84 instructs the worker 85 to evacuate, and the work manager 84 and the worker 85 evacuate outside the construction limit of the track 6. When communication between the outside train guard 82 and the local train guard 83 is interrupted due to a failure of the work radio 86, the outside train guard 82 arranges a train stop by waving a red flag 87 I do. If the train crew does not notice the red flag 87, an accident may occur. For this reason, in order to further improve the safety of the work on the track, as an auxiliary means for the red flag 87, it has been studied to transmit a warning to the crew members of the train 2 using radio.

  There is a train radio system as information transmission means between a commander at a command center and a crew member of a train (for example, see Patent Document 1). It is possible for a train watchman to transmit information to the commander using a telephone along the line, and to transmit the information from the commander to the train crew by the train radio system. However, since it takes time to transmit information from the railway line to the train crew via the commander, it cannot be said that it is suitable for transmitting an alarm in an emergency that requires a train stop arrangement.

  In the train radio system, a plurality of radio channels having different frequencies are used. The radio channel is used by switching between sections, up and down lines, and station premises. For this reason, when a radio using the radio of the train radio system is made and a train watchman carries the radio and tries to send an alarm directly to the train, a human error called a radio channel selection error in the radio An alarm may not be transmitted.

Japanese Patent Laid-Open No. 10-285101

  The present invention solves the above-described problem and selects a radio channel in radio transmission of an alarm to a radio station in which some of the radio channels having different frequencies are set to be receivable. The purpose is to prevent mistakes.

  An alarm transmission device according to the present invention is an alarm transmission device for wirelessly transmitting an alarm to a radio station in which a part of a plurality of radio channels having different frequencies is set to be receivable. It is characterized in that alarms are wirelessly transmitted almost simultaneously in all wireless channels by sequentially switching channels and wirelessly transmitting alarms.

In this alarm transmission device, the wireless station is an on-board station for performing wireless communication with a base station mounted on a train and connected to the command station by wire, and a call between the command station and the train. The train radio system, which is a system for use, has the base station and the on- board station, the frequency of the radio channel is a frequency used for the train radio system, and the alarm is transmitted to the train crew The radio is transmitted to the on-board station from the vicinity of the track on which the train travels, and is received by the on-board station. The radio wave transmitted to the on-board station is preferably a carrier wave modulated with an alarm sound.

In this alarm transmission device, the wireless transmission is preferably performed by a frequency modulation method. The wireless transmission may be performed by an amplitude modulation method. The radio channel is preferably switched by automatically changing a carrier frequency using a PLL synthesizer.

  In this alarm transmission device, it is preferable that the alarm transmission device is carried by a train guard in the work on the track.

  In this alarm transmission device, an alarm may be wirelessly transmitted to the onboard station when installed at a railroad crossing and when the emergency button for the railroad crossing is pressed or when the obstacle detection device for the railroad crossing operates.

  According to the alarm transmission device of the present invention, since alarms are wirelessly transmitted almost simultaneously on all the wireless channels, it is not necessary for the user of the alarm transmission device to select a wireless channel, and an error in selecting a wireless channel can be prevented. . In addition, since the alarm is transmitted wirelessly by sequentially switching each wireless channel, interference between radio waves of a plurality of wireless channels does not occur.

The figure which shows the use condition of the alarm transmitter which concerns on the 1st Embodiment of this invention. The perspective view of the alarm transmitter. The timing chart which shows the output of the alarm transmitter for every radio channel. The figure which shows the work in a track | line using the same alarm transmitter. The block block diagram of the alarm transmitter which concerns on the 2nd Embodiment of this invention, and a level crossing security device. The figure which shows the work in the conventional track.

(First embodiment)
An alarm transmission device according to a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the alarm transmission device 1 of this embodiment is for transmitting an alarm to a crew member of a train 2. This alarm transmission device 1 is used in a line section where a train radio system is provided. The train radio system includes a base station 3 on the ground side and an on-board station 4 on the upper side of the vehicle. The base station 3 is connected to the command station 5 by wire. The onboard station 4 is a radio station that is mounted on the train 2 and performs radio communication with the base station 3. The alarm transmitter 1 wirelessly transmits an alarm to the onboard station 4 of the train 2 traveling on the track 6 from the vicinity of the track. The warning is received by the onboard station 4. In the present embodiment, this wireless transmission is performed by a frequency modulation method.

  The train radio system is a command call system introduced nationwide on conventional lines in Japan. The transport commander in the command station 5 on the conventional line collects information and transmits the command to and from the crew members of the train 2 using the train radio system. There are two types of train radio systems: a duplex type A, a half duplex type B, and a simplex type C. These types are selected in consideration of the train operation density for each line section, and B type and C type are mainly introduced. The base station 3 is provided along the line 6 at an interval of about 3 km, and has B-type or C-type radio equipment. The onboard station 4 accommodates the C-type radio in the B-type radio so that the vehicle can be operated in both the B-type and C-type line, and the train is in the B-type line. Even when traveling, the C-type radio is ready to receive.

  The alarm transmission device 1 of the present embodiment wirelessly transmits an alarm to the radio of the onboard station 4. The radio equipment of the on-board station 4 is, for example, a radio equipment of a C type train radio system. A frequency modulation method is used for the C-type train radio system. The radio wave transmitted by the alarm transmitter 1 is obtained by modulating a carrier wave with an alarm sound. The alarm sound is, for example, a recorded voice “Stop”. The alarm sound only needs to be identifiable as an alarm, and may be a single sound or a special signal sound. The special signal sound is, for example, a sound having a pitch pattern.

  As shown in FIG. 2, the alarm transmission device 1 includes a device main body 11, a transmission antenna 12, and a transmission button 13. The transmission button 13 is colored red. When the transmission button 13 is pressed by the user, an alarm is wirelessly transmitted.

  A train radio system uses a plurality of radio channels having different frequencies. The on-board station 4 is set to be able to receive some of the plurality of wireless channels having different frequencies. The radio channel is determined by dividing the frequency band of the radio wave to be used into a plurality of sections. For example, in the C type train radio system, the number of radio channels is three. A receivable radio channel is selected corresponding to the line section or the like. As shown in FIG. 3, the alarm transmission device 1 is substantially simultaneously transmitted to all the radio channels CH1 to CH3 by sequentially switching the radio channels CH1 to CH3 and wirelessly transmitting the alarm to the onboard station 4. Send alarms wirelessly. The radio channel switching in the alarm transmitter 1 is performed by automatically changing the carrier frequency using a PLL synthesizer. In FIG. 3, the horizontal axis represents time t, and the vertical axis represents the output of each of the radio channels CH1 to CH3. In this embodiment, the time Tc for transmitting an alarm on one radio channel is about 200 ms, and the time for transmitting an alarm on all three channels is about 600 ms. Such channel switching is repeated at a cycle T≈3Tc. The onboard station 4 receives an alarm on a part of the radio channels, and emits an alarm sound intermittently at a period T.

  As shown in FIG. 4, the alarm transmission device 1 configured as described above is carried by a train guard, particularly, an outside train guard 82 in the work on the track. The outside train guard 82 is disposed in the vicinity of the track away from the work site 81 in the train traveling direction. A local train guard 83 is arranged near the work site 81. At the work site 81, a work manager 84 and a worker 85 are engaged in work. When the outside train guard 82 recognizes the approach of the train 2, the train guard 82 notifies the local train guard 83 of the approach of the train by the work radio 86. When communication between the outside train guard 82 and the local train guard 83 is interrupted due to a failure of the work radio 86, the outside train guard 82 arranges a train stop by waving a red flag 87 And the transmission button 13 of the alarm transmission device 1 is pressed. When the transmission button 13 is pressed, the alarm transmission device 1 wirelessly transmits an alarm on all the wireless channels almost simultaneously. The onboard station 4 receives the alarm regardless of which radio channel is set to be receivable. The onboard station 4 has a speaker in the driver's cab of the train 2 and, when receiving an alarm, emits an alarm sound from the speaker.

  Since the alarm transmission device 1 wirelessly transmits an alarm to the onboard station 4 from the vicinity of the track on which the train 2 travels, the distance from the onboard station 4 is extremely close. For this reason, in the onboard station 4, the radio wave intensity of the alarm received from the alarm transmitter 1 is stronger than the signal received from the base station 3. In the frequency modulation method, when a signal having a strong radio wave intensity at the same carrier frequency and a weak signal are received, the weaker signal is masked. Therefore, even when the crew member of the train 2 is talking with the commander at the command station, the onboard station 4 receives the warning from the warning transmission device 1 in preference to the voice from the base station 3.

  When the amplitude modulation method is used for radio transmission, masking as in the frequency modulation method does not occur, but the onboard station 4 simultaneously receives the alarm from the alarm transmitter 1 and the voice from the commander. In this case, since the warning from the warning transmission device 1 is recognized by the crew of the train 2 by overlapping the voice from the commander, the warning can be transmitted.

  When the crew member of the train 2 hears an alarm sound emitted by the onboard station 4 and determines that the train 2 needs to be stopped by visual recognition of the red flag 87, the crew member immediately applies the emergency brake. The train 2 is stopped before the work site 81 by an emergency brake.

  As described above, according to the alarm transmission device 1 according to the present embodiment, since alarms are wirelessly transmitted substantially simultaneously in all the wireless channels CH1 to CH3, it is not necessary for the user of the alarm transmission device 1 to select a wireless channel, and wirelessly. Channel selection errors can be prevented. Moreover, since the alarm transmission apparatus 1 switches each radio channel CH1-CH3 sequentially and transmits an alarm wirelessly, the interference between the radio waves of the plurality of radio channels CH1-CH3 does not occur.

  Since the alarm transmitter 1 wirelessly transmits an alarm directly from the vicinity of the track to the onboard station 4 of the train 2, the alarm can be quickly transmitted to the train crew from the vicinity of the track. Further, since the alarm is received by the on-board station 4, it is not necessary to newly install a receiver for alarm reception on the train 2 and the introduction cost of the alarm transmitter 1 is reduced.

  When radio transmission is performed by the frequency modulation method, the onboard station 4 receives the warning from the warning transmission device 1 with priority over the voice from the base station 3 by masking. It becomes easy to recognize.

  By carrying the alarm transmission device 1 by the train guard 82 in the work in the track, the alarm transmission device 1 can be used for train stop arrangement, and the safety of the work in the track is further improved.

(Second Embodiment)
An alarm transmission device 1 according to a second embodiment of the present invention will be described with reference to FIG. The alarm transmission device 1 of the present embodiment has the same configuration as that of the first embodiment, and is different in that it is installed at a railroad crossing. The alarm transmission device 1 wirelessly transmits an alarm when the emergency button 911 for a railroad crossing is pressed or when the obstacle detection device 92 operates.

  A railroad crossing is a section where a railroad and a road intersect. A railroad crossing safety device is provided at the railroad crossing to ensure safety. The structure of the railroad crossing safety device differs depending on the level crossing installation location and the type of crossing. In this embodiment, the case of a typical type 1 automatic crossing is shown. A type 1 crossing is a crossing having a crossing alarm 93 and a crossing breaker 94. The automatic level crossing is a level crossing in which the level crossing breaker 94 and the like operate by automatic control.

  The level crossing is a level crossing safety notification device 91, an obstacle detection device 92, a level crossing alarm 93, a level crossing breaker 94, a level crossing controller 95a, 95b, a level crossing control device 96, and a train direction. It has an indicator 97, a special signal light emitter 98, and a crossing failure indicator 99. The level crossing controllers 95a and 95b are provided at the start point and the stop point, respectively, and detect the train. When a train is detected by the level crossing controller 95a, the level crossing control device 96 operates the level crossing alarm 93 and the like. The railroad crossing alarm 93 warns the level crossing passerby that the train is approaching the railroad crossing by a flashing red light and a warning sound. The railroad crossing breaker 94 blocks road traffic with a blocking bar. The train direction indicator 97 indicates the traveling direction of the train to the crossing passer. The level crossing trouble notification device 91 includes an emergency button 911, and causes the special signal light emitter 98 to emit light when the emergency button 911 is pressed. When the obstacle detection device 92 detects an obstacle on a crossing, the obstacle detection device 91 is automatically operated. The level crossing failure indicator 99 indicates to the level crossing passer that the level crossing alarm 93 is broken.

  In the present embodiment, the alarm transmission device 1 is connected to a crossing trouble notification device 91 and an obstacle detection device 92 of a crossing safety device. The radio transmitted by the alarm transmitter 1 is preferably set so that the radio wave intensity is stronger than the radio from the base station in a track separated from the railroad crossing by the braking distance of the train.

  In such a level crossing, when the emergency button 911 of the level crossing trouble notification device 91 is pushed by a level crossing person, the special signal light emitter 98 emits light, and the alarm transmission device 1 wirelessly transmits an alarm. The onboard station 4 of the train approaching the railroad crossing receives an alarm and emits an alarm sound. The crew of the train visually recognizes the light emission of the special signal light emitter 98 and hears an alarm sound from the onboard station 4 and immediately applies an emergency brake. If the train crew does not notice the light emission of the special signal light emitter 98, it hears an alarm sound and applies an emergency brake. The train is stopped before the railroad crossing by an emergency brake.

  When the obstacle detection device 92 detects an obstacle on the crossing, the crossing trouble notification device 91 operates, the special signal light emitter 98 emits light, and the alarm transmission device 1 wirelessly transmits an alarm. The onboard station 4 of the train approaching the railroad crossing receives an alarm and emits an alarm sound. The crew of the train visually recognizes the light emission of the special signal light emitter 98 and hears an alarm sound from the onboard station 4 and immediately applies an emergency brake. If the train crew does not notice the light emission of the special signal light emitter 98, it hears an alarm sound and applies an emergency brake. The train is stopped before the railroad crossing by an emergency brake.

  As described above, according to the alarm transmission device 1 according to the present embodiment, when the emergency button 911 for a railroad crossing is pressed or when the obstacle detection device 92 is operated, the on-board station 4 of the train approaching the railroad crossing warns. Since it receives, it becomes easy for the crew of a train to recognize the abnormality of a crossing, and the safety of a crossing improves.

  In addition, this invention is not restricted to the structure of said embodiment, A various deformation | transformation is possible in the range which does not change the summary of invention. For example, in the second embodiment, if the emergency button 911 or the obstacle detection device 92 is provided at the level crossing, the level crossing provided with the alarm transmission device 1 may be a level crossing other than the type 1 automatic level crossing.

1 Alarm transmitter 2 Train 3 Base station 4 On-board station (radio station)
6 Track 82 Train guard 911 Emergency button 92 Obstacle detection device CH1, CH2, CH3 Radio channel

Claims (7)

An alarm transmission device for wirelessly transmitting an alarm to a radio station set to be able to receive a part of a plurality of radio channels having different frequencies,
By sequentially switching each wireless channel and wirelessly transmitting alarms, all wireless channels transmit alarms almost simultaneously,
The radio station is an on-board station for performing radio communication with a base station mounted on a train and connected to a command center by wire,
A train radio system that is a communication system between the command center and the train has the base station and the onboard station,
The frequency of the radio channel is a frequency used for the train radio system,
In order to transmit the warning to a crew member of a train, the warning transmission device is characterized in that the warning is wirelessly transmitted to the onboard station from the vicinity of the track on which the train travels and is received by the onboard station. 2. The alarm transmission device according to claim 1, wherein the radio wave transmitted to the on-board station is a carrier wave modulated by an alarm sound. The wireless transmission, an alarm transmission device according to claim 1 or claim 2, characterized in that performed by the frequency modulation. The alarm transmission device according to claim 2, wherein the wireless transmission is performed by an amplitude modulation method. The alarm transmission device according to any one of claims 1 to 4, wherein the switching of the wireless channel is performed by automatically changing a carrier frequency using a PLL synthesizer. The alarm transmission device according to any one of claims 1 to 5, wherein the alarm transmission device is carried by a train watchman in the work on the track. Is installed in a railroad crossing, when the emergency button of the railroad crossing is pressed, or when said crossing of the obstacle detection device is operated, the preceding claims, characterized in that wirelessly transmits an alarm to the vehicle upper station The alarm transmission device according to any one of 5 .

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