JP2014091417A - Operation monitoring circuit for railroad crossing gate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily achieve a railroad crossing gate operation monitoring circuit that monitors the incorrect ascent of a shutdown rod more than a predetermined time when the descent condition of the shutdown rod is continued.SOLUTION: A monitoring circuit 20 made of a relay circuit is provided in a railroad crossing gate 10 configured such that an ascending/descending control circuit 11 made by an electronic circuit ascends and descends a shutdown rod 18 by performing rotation control of a motor 13 according to ascending/descending command signals TER, CR1, and also a descent detection member 16 detects the shutdown rod 18 in a descent position to generate a descent position signal LLS. A non-descent detection circuit 21 detects a state of non-descent in which the shutdown rod 18 cannot descend within a predetermined time in the descent instruction of the ascending/descending command signal CR1 using a retention time relay TMR. In addition, an incorrect ascent detection circuit 30 detects a state of incorrect ascent in which the shutdown rod descent detection of the descent position signal LLS is cut off more than a predetermined time during continuation of descent instructions of the ascending/descending command signal CR1 using the same retention time relay TMR. By this arrangement, the shutdown rod 18 is made to descend by its own weight when detecting abnormal conditions.

Description

  The present invention relates to a crossing circuit breaker operation monitoring circuit that monitors the operation of a crossing circuit breaker, and more particularly to a crossing circuit breaker operation monitoring circuit that detects an abnormality related to the lowering of a barrier rod.

  A railroad crossing breaker (see, for example, Patent Documents 1 to 3) includes a barrier rod that opens and closes a railroad crossing, a motor that raises and lowers the barrier rod, a motor drive circuit that rotationally drives the motor, and an external device such as a railroad crossing control device. A lift control circuit that controls the lifting and lowering of the barrier rod by generating a motor rotation command to the motor drive circuit in response to a lift command signal received from the device, and a lowered position where the barrier rod closes the railroad crossing A lowering detecting member for detecting that the lowering member is descending, and an ascending detecting member for detecting that the blocking bar is raised to a rising position for opening the railroad crossing. When instructed, the barrier rod is lowered and stopped at the lowered position, and when the raising command is instructed by the elevation command signal, the barrier rod is raised and stopped at the raised position. It has become the jar.

  The railroad crossing breaker (see, for example, Patent Documents 1 and 3) also includes an operation monitoring circuit for fail-safe. The operation monitoring circuit is a timer circuit mainly composed of a slow-release element relay, which starts the timer under the condition of breaking / falling descent, and stops the timer by detecting the breaking / falling descent of the descent detecting member. When the shutoff rod does not reach the lowered position within a predetermined time after the lowering is instructed by, it is determined that an abnormality has occurred in the lowering of the shutoff rod, and power supply from the motor drive circuit to the motor is forcibly cut off. The barrier rod is lowered by its own weight. Conventionally (see, for example, Patent Document 1), not only this operation monitoring circuit, but also the above-described lift control circuit is configured by a relay circuit. Safety was ensured.

No. 7-16540 JP 2006-69333 A Japanese Patent Application No. 2011-068939

  However, under the technical trend of configuring the lift control circuit with an electronic circuit such as a microprocessor (see, for example, Patent Document 3), the electronic circuit for the lift control circuit is not a dual fail-safe computer but a single system due to cost constraints. Adopting a general computer is becoming unavoidable, but in such a case, it is difficult to ensure the same level of safety as before simply by monitoring the inability to lower the barrier with an operation monitoring circuit. . In other words, when the lifting control circuit is configured with a relay circuit, a fail-safe lifting control circuit that does not continue to raise the breaking rod against the breaking rod descent condition even if a circuit element or the like breaks down has a proven safety However, if the lift control circuit is configured with a general electronic circuit, the lift control circuit may be in a condition that causes a break-down condition depending on the failure of the lift control circuit. On the other hand, it is also conceivable to raise the blocking rod undesirably.

And as one of the countermeasures, it is good to make the elevating control circuit have a fault diagnosis function and to cooperate with the relay circuit to ensure fail-safety (see, for example, Patent Document 3), but it is composed of a relay circuit. If the operation monitoring circuit that monitors the falling of the breaking rod within a certain time is taken over when the breaking rod descent condition is input, it is necessary to use it in accordance with it. It is desirable to ensure fail-safety.
Therefore, it is a technical problem to simply realize a crossing breaker operation monitoring circuit for monitoring an illegal rise of the breaking rod over a predetermined time when the breaking rod descent condition is continued.

  The level crossing breaker operation monitoring circuit of the present invention (Solution 1) was created to solve such a problem, and comprises a monitoring circuit that detects an abnormality with a timer using a time element relay, In accordance with a lifting command signal received from an external device, the lifting control circuit controls the rotation of the motor to raise and lower the barrier rod, and the lowering detection member indicates that the barrier rod is lowered to a lowered position where the railroad crossing is closed. It is provided in a railroad crossing breaker that detects and generates a descending position signal, monitors the ascending / descending operation of the shut-off rod based on the ascending / descending command signal and the descending position signal, and cuts off the power supply to the motor when abnormal. In the crossing circuit breaker operation monitoring circuit for dropping the barrier rod by its own weight, the timer is started in response to a change from the rising instruction to the lowering instruction of the raising / lowering command signal, and the lowering position signal In addition to a descent impossibility detecting circuit for detecting a descent impossibility that the interrupting descent cannot be lowered within a predetermined time by stopping the timer in response to detection of a descent descent, the descent command signal while the descent instruction continues The present invention is characterized in that it includes an unauthorized rise detection circuit that detects an unauthorized rise in which the detection of the drop position signal of the lowered position signal stops for a predetermined time or longer by a timer operation using a time relay.

  Further, the crossing circuit breaker operation monitoring circuit of the present invention is (solution means 2), the crossing circuit breaker operation monitoring circuit of the solution means 1, wherein the condition part of the unauthorized rise detection circuit is the time element part of the time element relay. And the time relay is used both as a timer for the descent impossible detection circuit and as a timer for the illegal rise detection circuit.

  Further, the crossing circuit breaker operation monitoring circuit of the present invention is (solution means 3), the crossing circuit breaker operation monitoring circuit of the above solution means 1 and 2, wherein the barrier rod is moved down to the lowered position in response to the descending instruction of the elevation command signal. When the lowering position signal is detected and the lowering position signal has been detected, the lowering position signal is interrupted, but the lowering position signal is not correctly detected. The detection circuit is configured to detect illegal rise.

In such a crossing circuit breaker operation monitoring circuit of the present invention (solution 1), a new unauthorized rise detection circuit is provided where the descent impossibility detection circuit is configured with a proven conventional relay circuit. Has been added, and while the lowering command signal continues to be lowered, the lowering position signal breakage detection is detected until an illegal rise that stops for a predetermined time or longer. Even if it is configured by a circuit, an unauthorized increase in the blocking rod due to a malfunction of the lift control circuit is accurately detected, so that necessary safety is ensured.
Therefore, according to the present invention, the level crossing circuit breaker operation monitoring circuit for monitoring the inability to descend the breaking rod when the breaking rod descent condition is input and monitoring the illegal rise of the breaking rod when the breaking rod descent condition is continued is a conventional relay circuit. This can be realized simply following the above.

Further, in the level crossing breaker operation monitoring circuit of the present invention (solution 2), the necessary two timer functions are exhibited by one time element relay, so that the relay circuit is simplified.
Therefore, according to the present invention, the level crossing circuit breaker operation monitoring circuit for monitoring the inability to descend the breaking rod when the breaking rod descent condition is input and monitoring the illegal rise of the breaking rod when the breaking rod descent condition is continued is a conventional relay circuit. Can be realized simply and simply by using.

In a crossing control device provided for a crossing in a double track section, if a train enters the same warning section immediately after a certain train passes the crossing and enters the warning section, it responds to the train advancement. The up instruction is maintained during the time when the up / down command signal that has been instructed in advance is set in advance, but after that time elapses, the instruction is changed to the down instruction. Therefore, if the time specified by the time element related to detection of illegal rise is longer than the ascending instruction maintenance time secured by the time element related to the up / down command signal, the timer operation of the time element relay may not be stable. Can occur.
On the other hand, in the level crossing breaker operation monitoring circuit of the present invention (Solution means 3), the illegal rise only occurs within a time frame shorter than the ascending instruction maintenance time from when the breaking position signal breakage detection is stopped. Since the detection is not performed, even when the equipment level crossing breaker is provided at the crossing in the double-track section, it is possible to accurately detect not only the descent but also the illegal rise.

1 is a block diagram of a level crossing breaker and a circuit diagram of a level crossing breaker operation monitoring circuit according to the first embodiment of the present invention. FIG. It is an example of a signal waveform at the time of normal operation concerning a level crossing breaker operation monitoring circuit. It is an example of a signal waveform at the time of a descent impossible detection concerning a level crossing breaker operation monitoring circuit. It is an example of a signal waveform at the time of an illegal rise detection concerning a level crossing breaker operation monitoring circuit.

With respect to such a crossing breaker operation monitoring circuit of the present invention, a specific mode for carrying out this will be described with reference to Example 1 below.
The embodiment 1 shown in FIGS. 1 to 4 embodies all the above-described solving means 1 to 3 (claims 1 to 3 at the beginning of the application).

  A specific configuration of the first embodiment of the crossing breaker operation monitoring circuit according to the present invention will be described with reference to the drawings. FIG. 1A is a block diagram of a railroad crossing breaker 10, and FIG. 1B is a circuit diagram of a monitoring circuit 20 (railway crossing barrier operation monitoring circuit).

  First, the railroad crossing breaker 10 equipped with the monitoring circuit 20 (the railroad crossing barrier operation monitoring circuit) will be described. The railroad crossing barrier 10 (see FIG. 1 (a)) swings the barrier 18 that opens and closes the railroad crossing. A barrier rod holding portion 17 that holds the movable rod in a cantilever state, and a barrier rod through the rotary transmission portion 14 to raise and lower the barrier rod 18 so that the barrier rod 18 takes a substantially horizontal posture or a substantially vertical posture. A motor 13 (electric motor) that bidirectionally rotates the holding unit 17 by a predetermined swing angle θ, a motor drive circuit 12 that performs rotational driving of the motor 13 by, for example, three-phase power feeding, and an external crossing control device A lift control circuit 11 for controlling the lifting / lowering of the barrier 18 by generating a motor rotation command Sm to the motor drive circuit 12 in response to the lift command signal CR1 relayed by the crossing fixture box. Have

  Further, the railroad crossing breaker 10 (see FIG. 1A) detects that the blocking bar 18 has risen to the ascending position at which the railroad crossing road is opened, and feeds back the ascending position signal ULS to the elevation control circuit 11. A rising detection member 15, and a lowering detection member 16 that detects that the blocking bar 18 is lowered to a lowered position that closes the railroad crossing and feeds back the lowered position signal LLS to the elevation control circuit 11. When the lowering command 18 is instructed to be lowered, the barrier rod 18 is lowered to the lowered position and stopped there, and when the elevator command signal CR1 is instructed to be raised, the barrier rod 18 is raised to the elevated position and stopped there. It is supposed to let you. The above elements 11 to 18 constituting the railroad crossing breaker 10 may be known ones except that the elevating control circuit 11 is embodied by an electronic circuit (see, for example, Patent Documents 1 and 2). Further explanation of elements 11-18 is omitted.

  Further, the railroad crossing breaker 10 (see FIG. 1 (a)) also includes a monitoring circuit 20 that detects an operation abnormality of the railroad crossing breaker 10 with a timer using a slow release element relay TMR. The monitoring circuit 20 receives the raising / lowering command signal CR1 and the lowered position signal LLS, and monitors the raising / lowering operation of the blocking bar 18 based on these signals. When the hourly relay TMR falls due to timeout, an abnormality is detected. The railroad crossing breaker 10 lowers the weight of the barrier rod 18 by cutting off the power supply to the motor 13 according to the abnormality detection of the monitoring circuit 20.

  In order to supply power to the motor 13 for driving up and down or to cut off power supply to the motor 13 for lowering its own weight, the power supply line of the motor 13 may be turned on / off. The power supply line of the motor drive circuit 12 is turned on / off at a contact point of a normal relay R (normal R) indicating normal operation. In addition to the normal relay R, a self-weight relay R (self-weight R) indicating that the operation state is forced to reduce its own weight, or a serious relay R (serious R) indicating that a serious failure has occurred. ) Also responds to the time-out of the slow release elementary relay TMR, and more specifically, each relay drops.

  A specific circuit configuration example of the monitoring circuit 20 will be described (see FIG. 1B). The monitoring circuit 20 includes a descent impossible detection circuit 21 that follows the conventional circuit, and a newly added illegal increase detection circuit 30. It has. Whereas the above-described lifting control circuit 11 is an electronic circuit using a single common computer, the monitoring circuit 20 includes not only the descent impossible detection circuit 21 but also the illegal rise detection circuit 30 as an electromagnetic relay or a semiconductor relay. It is made with a relay circuit using. Both the inability to descend detection circuit 21 and the unauthorized rise detection circuit 30 are relay circuits that allow the slow release element relay TMR to function as a timer. The inability to descend detection circuit 21 includes the condition part 22 and the element in addition to the slow release element relay TMR. In contrast, the unauthorized rise detection circuit 30 includes a relay relay unit 31 and a condition unit 32. The timer of the inability to descend detection circuit 21 and the timer of the unauthorized rise detection circuit 30 are provided. In order to share the slow release element relay TMR, the condition part 32 of the unauthorized rise detection circuit 30 is incorporated in the time element part 23 of the slow release element relay TMR in a parallel connection form.

  Although each circuit will be described, the specific circuit configuration can be variously modified, so only a basic example is shown (see FIG. 1B). Here, the specific circuit circuits important for the implementation of the present invention are described. Details the role The condition unit 22 of the inability to descend detection circuit 21 includes, for example, a parallel connection circuit of a relay contact related to the elevation command signal CR1 and an open / close switch related to the descending position signal LLS, and when the elevation command signal CR1 instructs to rise and The slow release element relay TMR is excited whenever the lowering position signal LLS detects the lowering of the breaking rod. In other words, the excitation of the slow release element relay TMR is stopped only when the lowering command signal CR1 instructs the lowering but the lowering position signal LLS does not detect the breaking / falling descent.

  Further, the time element 23 of the slow release element relay TMR in the descent impossible detection circuit 21 is composed of, for example, a CR charge / discharge circuit in which a resistor and a capacitor are connected in series, and the excitation of the slow release element relay TMR by the condition part 22 is performed. The release element relay TMR is maintained in an excited state until the predetermined time by the time element unit 23 elapses, but after the predetermined time has elapsed, the slow release element relay TMR is shifted to a non-excited state with a delay. Thus, the slow release element relay TMR functions as a timer.

  Further, the descent impossible detection circuit 21 includes the condition unit 22 and the time element unit 23 described above, so that the timer function of the slow release element relay TMR according to the change from the rising instruction to the lowering instruction of the ascending / decreasing command signal CR1. , And detecting the impossibility of lowering when the shut-off rod 18 cannot be lowered within a predetermined time by stopping the timer function of the slow release element relay TMR in response to the detection of the drop-off position signal LLS. It has become. It should be noted that during the above-mentioned predetermined time (hereinafter referred to as the descent impossibility confirmation time) defined by the time element 23 of the descent impossible detection circuit 21, it is appropriate that the lifting / lowering operation of the blocking rod 18 is performed in about 6 seconds one way. Is set to about 10 seconds, which is sufficiently longer than that.

  The unauthorized rise detection circuit 30 causes the time frame portion 31 and the condition portion 32 to define two predetermined times of different lengths one by one in order to accurately detect the unauthorized rise of the barrier 18 even at a crossing in a double track section. ing. Specifically, in the time crossing warning section of the double track section, the time element (hereinafter referred to as the minimum lifting time t0 of the lifting / lowering command signal CR1) related to the lifting / lowering command signal CR1 due to the train approach immediately after entering the train is at least 4 seconds. Is secured, for example, 2 seconds, which is half of the minimum climbing time t0, is adopted as a predetermined time shorter than the minimum climbing time t0 (hereinafter referred to as the illegal climbing monitoring time t1). The illegal rise monitoring time t1 in seconds is defined by the time element of the time frame portion 31. In addition, for example, 1 second is adopted as a predetermined time (hereinafter, referred to as an unauthorized rise confirmation time t2) that is shorter than the unauthorized rise monitoring time t1 but longer than chattering, surge noise, or the like of the fall detection member 16. Is determined by the condition unit 32.

  The time frame unit 31 in the unauthorized increase detection circuit 30 is a relay circuit including a relay relay 1R that generates a relay signal corresponding to the lowered position signal LLS and a time frame generation relay 2R that defines the unauthorized increase monitoring time t1. The relay relay 1R can be configured as a single relay because it only converts the descending position signal LLS into a relay signal. However, the relay contact of the relay relay 1R and, for example, a CR charging / discharging circuit are also connected to the time frame generation relay 2R. ing. When the relay relay 1R is excited, the time frame generating relay 2R is excited and the CR charge / discharge circuit is charged. When the relay relay 1R is not excited, the CR charge / discharge circuit is discharged. For this reason, when the lowering position signal LLS transitions from the state in which the breaking rod descent is detected to the state in which the blocking rod descent is not detected, the time frame generation relay 2R is energized only during the illegal rise monitoring time t1. Such a time frame generation relay 2R generates a relay signal for the time frame of the illegal rise monitoring time t1 when the blocking bar 18 moves away from the lowered position after reaching the lowered position.

  The condition part 32 in the unauthorized rise detection circuit 30 is composed of, for example, a series connection circuit of a relay contact of the relay relay 1R, a relay contact of the time frame generation relay 2R, a relay contact of the elevation command signal CR1, and a resistor. Are connected in parallel. The up / down command signal CR1 instructs the lowering, the time frame generation relay 2R generates the time frame of the illegal increase monitoring time t1, and the original lowering position signal LLS of the relay relay 1R detects the breaking / falling descent. The element release relay TMR is controlled to drop only when the three conditions are satisfied. The time element of the slow release time element relay TMR defined by the condition part 32 is shorter than the minimum rise time t0 of the time element defined by the time element part 23, and further the time frame defined by the time frame generation relay 2R. The unauthorized rise confirmation time t2 is shorter than the unauthorized rise monitoring time t1.

  Then, the unauthorized rise detection circuit 30 includes the time frame unit 31 and the condition unit 32 described above, so that the time until the unauthorized increase monitoring time t1 elapses after the detection of the drop position signal LLS is stopped. While trying to detect the illegal rise of the barrier rod 18 only within the frame, in that trial, the detection of the lower rod position of the lower position signal LLS is longer than the illegal rise confirmation time t2 while the lowering command signal CR1 continues to be lowered. When it stops, it is detected by a timer operation using a slow release element relay TMR as an illegal rise.

The usage mode and operation of the monitoring circuit 20 (crossing breaker operation monitoring circuit) of the first embodiment will be described with reference to the drawings. 2 to 4 are waveform examples relating to several signals in the monitoring circuit 20, FIG. 2 is an example of a signal waveform during normal operation, FIG. 3 is an example of a signal waveform when a descent cannot be detected, and FIG. It is an example of a signal waveform at the time of detection.
Since the monitoring circuit 20 is installed in the railroad crossing breaker 10 and monitors the lifting / lowering operation of the barrier 18, the normal operation, the descent impossible detection, and the illegal rise detection will be described in order.

  When the railroad crossing breaker 10 is normal (see FIG. 2), the lift command signal CR1 instructs to rise until the train arrives at the installation level crossing, and accordingly the barrier 18 continues to stop at the lifted position. Since the lowering position signal LLS does not indicate the detection of the breaking rod drop, in the monitoring circuit 20, the timer for using the slow release element relay TMR is stopped, the relay relay 1R does not activate the time frame generation relay 2R, The time frame generation relay 2R does not generate a time frame. For this reason, the self-weight relay R indicates a state where the self-weight does not fall, and the critical relay R and the normal relay R indicate an accident-free state, so that the motor drive circuit 12 and the motor 13 are operable in the railroad crossing breaker 10. As a result, the blocking bar 18 can be moved up and down in accordance with the control of the lifting control circuit 11.

  In this state, when the train approaches the railroad crossing, the instruction of the raising / lowering command signal CR1 changes from rising to lowering (see time t21 in FIG. 2). A timer for using the slow release element relay TMR is started. Then, during normal operation, before the elapse time of about 10 seconds until the descent impossibility of confirmation elapses (see time t22 in FIG. 2), the blocking rod 18 reaches the lowered position, and the lowered position signal LLS indicates the detection of the broken rod drop. Therefore, in the monitoring circuit 20, the timer for using the slow release element relay TMR stops and the relay relay 1R responds. However, at this start timing, the relay relay 1R does not yet activate the time frame generation relay 2R. The generation relay 2R does not generate a time frame. Therefore, neither the self-weight relay R nor the critical relay R nor the normal relay R is changed, and in the railroad crossing breaker 10, the barrier bar 18 continues to stop at the lowered position in accordance with the control of the lift control circuit 11.

  Then, when the train passes through the railroad crossing, the instruction of the raising / lowering command signal CR1 changes from descending to ascending (see time t23 in FIG. 2), and accordingly the barrier rod 18 rises and leaves the descending position. Since the LLS does not indicate the detection of the breaking dredging, the relay relay 1R responds to the monitoring circuit 20 and this time the relay relay 1R activates the time frame generation relay 2R. Therefore, the time frame generation relay 2R monitors the illegal increase. A time frame of time t1 is generated, but within that time frame, the raising / lowering command signal CR1 instructs to rise, and therefore the timer for using the slow release relay TMR is activated by the condition unit 32 of the unauthorized rise detection circuit 30 It will never be done. Therefore, neither the self-weight relay R nor the critical relay R nor the normal relay R is changed, and in the railroad crossing breaker 10, the cutoff bar 18 rises according to the control of the lift control circuit 11. In this way, if the blocking rod 18 moves up and down normally, the inability to descend detection circuit 21 of the monitoring circuit 20 does not detect the inability to descend, and the unauthorized increase detection circuit 30 of the monitoring circuit 20 does not detect unauthorized increase. .

  On the other hand, when an abnormality occurs in the railroad crossing breaker 10 and the barrier 18 does not descend, or when the arrival of the barrier 18 is not detected (see FIG. 3), the train is Until the instruction of the lift command signal CR1 changes from rising to falling (see time t31 in FIG. 3) and the monitoring circuit 20 starts the timer for using the slow release element relay TMR accordingly. This is the same as in the normal state described above. However, in this abnormal situation, since the descending position signal LLS does not indicate the detection of the breaking rod descent after that, when the descent impossibility confirmation time of about 10 seconds has elapsed (see time t32 in FIG. 3), the monitoring circuit 20 The timer for slow release element relay TMR is up.

  Thus, the inability to descend the shut-off rod 18 is detected by the inability to descend detection circuit 21 of the monitoring circuit 20, and the own weight relay R, the critical relay R, and the normal relay R respond to the inability to descend by the time-up, Since the self-relay relay R indicates a state in which the self-weight falls, and the critical relay R and the normal relay R indicate an accident state, in the railroad crossing breaker 10, the power supply to the motor drive circuit 12 and thus the motor 13 is cut off. 18 descends to its lowered position under its own weight. Therefore, even if an abnormality occurs in the elevation control circuit 11 or the descent detection member 16 and a situation in which the descent is not possible is detected, the weight drop of the blocking rod 18 is forced by the action of the monitoring circuit 20 at that time. Fail-safety is ensured when entering the breaking dredging condition.

  On the other hand, even if there is an abnormality in the railroad crossing breaker 10, in the case of a non-obvious abnormality that is manifested by the inability to descend, it is detected that the barrier 18 has reached the lowered position within the descent impossibility confirmation time. The above-described descent impossible detection circuit 21 cannot cope with it. When the lift control circuit 11 is embodied by an electronic circuit that does not guarantee fail-safety, for example, when examining the appearance of bugs in the software of the lift control circuit 11, the lift control circuit 11 is a fail-safe relay circuit. Unlike the case of the embodiment, even when the appropriate lowering of the blocking rod according to the elevation command signal CR1 can be confirmed once based on the lowered position signal LLS, the blocking rod 18 is not actually lowered to the lowered position. It cannot be said that there is no problem that the lifting / lowering control circuit 11 raises the blocking rod 18 lowered to the lowered position against the raising / lowering command signal CR1.

  When there is such an abnormality (see FIG. 4), until the train comes to the railroad crossing, the train approaches the railroad crossing and the instruction of the lift command signal CR1 changes from rising to lowering (time t41 in FIG. 4). In response to this, the monitoring circuit 20 starts a timer for using the slow release element relay TMR, but before the time is up, the lowering position signal LLS indicates the detection of the breaking descent and the timer is stopped. Until the relay relay 1R responds (see time t42 in FIG. 4), it is the same as in the normal state described above (see times t21 and t22 in FIG. 2). However, in this abnormal situation, the descent position signal LLS does not show the detection of the breaking rod descent even though the elevation command signal CR1 continues to instruct the descent (see time t43 in FIG. 4).

  Then, in the unauthorized rise detection circuit 30 of the monitoring circuit 20, the relay relay 1R responds to the change in the descending position signal LLS, and the relay relay 1R activates the time frame generation relay 2R. A time frame for the monitoring time t1 is generated. In this abnormal situation, the original lowering position signal LLS of the relay relay 1R is cut off even though the raising / lowering command signal CR1 maintains the lowering instruction within the time frame of the illegal rising monitoring time t1 of about 2 seconds. Since the three conditions that no dredging has been detected are satisfied, a timer for using the slow release element relay TMR is started by the condition unit 32 of the unauthorized rise detection circuit 30, and the above three conditions are for an unauthorized rise confirmation time of about 1 second. When t2 is reached (see time t44 in FIG. 4), the timer for using the slow release element relay TMR is timed up.

  In this way, the illegal rise detection circuit 30 of the monitoring circuit 20 detects the illegal rise of the blocking rod 18, and the own weight relay R, the critical relay R, and the normal relay R respond to the illegal rise detection at the time up, Since the dead weight relay R indicates a state in which the dead weight is lowered and the serious relay R and the normal relay R indicate an accident state, in the railroad crossing breaker 10, the breaking bar 18 is lowered to the lowered position by its own weight. Therefore, even if an abnormality occurs in the lift control circuit 11 or the descending detection member 16 and an illegal rise is detected, the weight drop of the blocking rod 18 is forced at that time, so that the blocking rod descending condition input is performed. The safety of time is ensured.

  In this example, after the illegal rise is detected, if the lowering position signal LLS detects the breaking descent, the timer for using the slow release relay TMR and the critical relay R are reset (see time t45 in FIG. 4), and further rising and lowering are performed. When the instruction of the command signal CR1 changes from descending to ascending, the self-weight relay R is also reset (see time t46 in FIG. 4), so that the abnormality detection state is canceled and the normal operation state is automatically restored.

The electronically controlled railroad crossing breaker of the present invention can be applied to any one having a balancer or not having a balancer.
Also, not only those that swing the barrier rod as described above, but an electronically controlled level crossing blocker that can switch between the lifting control and the self-weight drop control, the elevator rod can be lifted and lowered while maintaining a horizontal posture. It can also be applied to.

10 ... Railroad crossing breaker, 11 ... Lift control circuit,
12 ... Motor drive circuit, 13 ... Motor (electric motor), 14 ... Rotation transmission part,
DESCRIPTION OF SYMBOLS 15 ... Ascent detection member, 16 ... Decrease detection member, 17 ... Blocking bar holding part, 18 ... Blocking bar
20. Monitoring circuit (crossing circuit breaker operation monitoring circuit),
21 ... Descent impossible detection circuit, 22 ... Condition part, 23 ... Time element part,
30 ... Injustice rise detection circuit, 31 ... Relay unit (time frame generation unit), 32 ... Condition unit,
TER, CR1 ... Lift command signal, Sm ... Motor rotation command,
LLS ... descending position signal, ULS ... ascending position signal,
TMR ... Release element relay, 1R ... Relay relay, 2R ... Time frame generation relay

Claims (3)

  It consists of a monitoring circuit that detects an abnormality with a timer using a time element relay, and the lifting control circuit controls the rotation of the motor according to the lifting command signal received from the external device to raise and lower the blocking rod, and the blocking rod is Provided in a level crossing breaker that generates a descending position signal by detecting that the descending position is lowered to a descending position for closing the level crossing, and based on the elevation command signal and the descending position signal, In the crossing circuit breaker operation monitoring circuit that monitors the lifting operation of the vehicle and cuts off the power supply to the motor and lowers the weight of the shut-off rod when abnormal, the timer according to a change from the rising command to the lowering command of the lifting command signal And the timer is stopped in response to the detection of the lowering position signal of the lowering position signal, so that the lowering speed cannot be lowered within a predetermined time. In addition to the descent impossibility detection circuit to detect, the timer operation using the time element relay detects the illegal rise in which the descent position descent detection of the descent position signal stops for a predetermined time or longer while the descent instruction of the elevating command signal is continued A crossing breaker operation monitoring circuit comprising an illegal rise detection circuit that performs the above operation.   The condition part of the illegal rise detection circuit is incorporated in the time element part of the time element relay, and the time element relay is used as both the timer of the non-descent detection circuit and the timer of the unauthorized increase detection circuit. The crossing breaker operation monitoring circuit according to claim 1.   The lowering of the raising / lowering command signal is continued even after the lowering instruction of the raising / lowering command signal continues after the lowering of the raising / lowering command signal continues. 3. The level crossing breaker operation monitor according to claim 1 or 2, wherein the unauthorized rise detection circuit detects an unauthorized rise when the detection of the breaking and descending position signal is interrupted. circuit.

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