JPH0621809Y2 - Gate rod lift detector - Google Patents

Description

TECHNICAL FIELD The present invention relates to a gate rod up / down abnormality detector that automatically detects an up / down abnormality of a gate rod of a circuit breaker in a parking lot or railroad crossing.

2. Description of the Related Art As a conventional method for detecting an abnormal rise and fall of a gate rod of a gate breaker in a parking lot or railroad crossing, a reference value of motor energization time when the gate rod is operating normally is used as a threshold for abnormality determination. Then, the method is used in which the actual motor energization time detected by the sensor when rising or falling is compared with this threshold value, and whether the gate rod is moving up or down is detected based on the magnitude of the threshold value. Normally, a weight for balancing is attached to the gate rod on the side opposite to the fulcrum, and the gate rod moves up and down in a state where the weight and the weight are balanced. Therefore, if the gate rod is broken, the balance between the two is lost, the weight side becomes heavier, the gate rod rise time (hence, motor energization time) becomes shorter, and conversely, the gate rod descent time (hence motor Energization time) becomes longer. Therefore, by comparing the actual energization time of the rise or fall with the threshold value, the abnormality of the gate rod can be detected.

Problems to be solved by the invention When the motor energization time during rising or falling is detected by comparison with a predetermined threshold value as described above, the type of gate rod, weight, balance adjustment by weight, motor capacity, etc. Due to the difference, even when the motor energization time is normal, it is not uniform. For this reason, when installing the gate or replacing the gate rod, it is necessary to finely adjust the balance between the gate rod and the weight so that the motor energization time is strictly adjusted to a predetermined value. However, there was a problem that it required skill and time to perform on-site work.

The present invention has been devised in view of the above circumstances, and provides a gate rod lifting / lowering abnormality detector which is extremely easy to adjust on site and has excellent workability.

Means for Solving the Problems In order to solve the above problems, the present invention detects the energization time or drive current value of a motor for driving a gate rod and detects a pulse having a time width proportional to the time or current value. A sensor for outputting, and a pulse counting circuit for counting the number of clock pulses of the time width with a pulse given from the sensor as a gate-on condition and generating an output at any of a plurality of output terminals corresponding to the count number. , A count indicator consisting of the same number of output terminals connected to each output terminal of the pulse count circuit as a display element group, and switching connection to any of the output terminals of the pulse count circuit And an abnormality detection circuit that detects when an output has occurred at any of the output terminals that are switched and connected and detects that an abnormality has occurred in raising or lowering the gate rod. It is composed of.

As an example of the operation, the operation in the case of detecting the gate rod ascending / descending abnormality based on the energization time when the gate rod is descending will be described. The gate rod lifting / lowering abnormality detector of the present invention is pre-adjusted to detect the gate rod lifting / lowering abnormality as follows when installing a gate for a breaker at a parking lot or railroad crossing, or when replacing a gate rod. .

That is, the weight is adjusted so that the raising / lowering operation of the gate rod is within the specified normal range, and then the power supply of the gate rod up / down abnormality detector of the present invention is turned on. When the gate rod is moved up and down in this normal state, the sensor detects the energization time when the gate moves up and down, and outputs a pulse having a time width proportional to the time.
The pulse counting circuit sequentially counts clock pulses during the arrival of a pulse corresponding to the gate rod descending among the output pulses of the sensor, and sequentially outputs the output to the output terminal corresponding to each count. Therefore, when the energization time ends and the counting operation ends, the display element of the display connected to the output terminal corresponding to the count number at the end of this counting lights up, and the energization time when the gate rod descends in the normal gate state. Is visually displayed to the worker.

While looking at the lighting position of the display, the operator sets a higher pulse count number to the reference value (threshold value) by the allowable error of the normal energization time from the lighting position to the pulse count number corresponding to the reference value. An abnormality detection circuit for detecting an abnormality in raising or lowering the gate rod is selectively connected to the output terminal of the corresponding pulse counting circuit through a changeover switch.

By the above operation, the pre-adjustment of the gate rod lifting / lowering abnormality detector of the present invention is completed, and thereafter, the detection operation of the gate rod lifting / lowering abnormality is started.

If there is no abnormality in raising and lowering the gate rod, the descent time of the gate rod is within the normal range. Therefore, each time the gate rod descends, the pulse count number output by the pulse count circuit is always within the normal range, and an output occurs only in the output terminal range lower than the output terminal to which the abnormality detection circuit is connected, The abnormality detection circuit never operates.

Now, for example, if the gate rod is broken, the balance of the gate rod will be lost and the weight attached to the opposite side of the fulcrum will be heavier, and as a result, the descent time of the gate rod and hence the energization time when the gate rod is lowered falls within the normal range. Beyond the length. For this reason,
The pulse count number of the pulse count circuit becomes larger than the normal range which is the reference value (threshold value), and the count output is given to the output terminal higher than the output terminal to which the abnormality detection circuit is connected. As a result, when the count output reaches the count value of the output terminal corresponding to the reference value (threshold value) to which the abnormality detection circuit is connected, the abnormality detection circuit detects and operates and notifies the occurrence of a gate abnormality. is there.

In the above description, the case where the gate rod lowering abnormality is detected based on the energization time when the gate rod is descending has been described, but it is also possible to detect based on the energization time when the gate rod is rising. In this case, the rise time of the gate rod, that is, the energization time becomes shorter than the normal time due to the breakage of the gate rod. Therefore, in contrast to the descending time, the abnormality detection circuit corresponds to the allowable error amount of the normal energization time. Only the output terminal corresponding to the reference value (threshold value) on the lower side may be selectively connected. Further, instead of the energization time, it is possible to detect based on the driving current value of the motor at that time. That is, when the gate rod is broken or the like, the weight side becomes heavier. Therefore, the drive current value of the gate rod drive motor is smaller than the normal current value when it rises and larger than the normal current value when it descends. Even if this drive current value is used as a reference value (threshold value) instead of time, it can be similarly detected.

Embodiment Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an example of a gate rod lifting / lowering abnormality detector according to the present invention, which is configured to detect a gate rod lifting / lowering abnormality based on an energization time when the gate rod is descending, in which 1 is a sensor and 2 is a sensor. Is a pulse count circuit, 3 is a display, and 4 is an abnormality detection circuit. In the case of the illustrated example, the sensor 1 is composed of a current transformer 11 and a rectifier circuit 12, and as shown in FIG. 2, the energization time of the drive current flowing through the gate rod drive motor M when the gate rod is raised and lowered is calculated as follows. It is a sensor that outputs a pulse with a proportional time width. The pulse count circuit 2 is
For example, the sensor 1 is composed of a decimal counter clock counter 21, a clock pulse generator 22, and an AND gate 23.
From among the pulses sent from, the pulse corresponding to the energization time when the gate rod is descending is selected, and the number of clock pulses of the clock pulse generator 22 is counted during the pulse generation of the time width proportional to the energization time, Each time the count is performed, an output is sequentially generated at any of the output terminals T _{1 to} T _n corresponding to the number of pulses. Indicator 3 consists pulse counting circuit display element group such as an LED of the same number as the output terminal T ₁ through T _n that is connected in one-to-one correspondence to each of the output terminals T ₁ through T _n of 2, the corresponding When an output is applied to the output terminal, the corresponding display element lights up, and the energization time at that time is visually displayed to the outside. Abnormality detection circuit 4
Is composed of a changeover switch 41, an amplifier 42, and an abnormality display alarm (detection lamp) 43. With the changeover switch 41, the output terminals T _{1 to} T _n of the pulse count circuit 2 can be freely changed over and selectively connected. When an output is generated at the output terminal corresponding to the value (threshold value), this is a circuit that detects the output and lights the abnormality display alarm (detection lamp) 43 and the like to notify the generation of the gate rod lift error.

In the above configuration, first, the following pre-adjustment is performed for detecting a gate rod up / down abnormality as follows. That is, after adjusting the raising / lowering operation of the gate rod within the specified normal range, the gate rod lifting / lowering abnormality detector is turned on to perform the raising / lowering operation of the gate rod. By this operation, the sensor 1 causes the current I flowing in the motor M as shown in FIG.
_AC is detected and rectified and output as a pulse indicating the energization time.

The pulse output from the sensor 1 is given to the AND gate 23 to turn on the gate. As a result, every time a pulse is applied from the sensor 1, the clock pulse of the dead clock pulse generator 22 is sent to the counter 21 while the output pulse of the sensor 1 is generated. The counter 21 starts counting under the gate-on condition that the control input to the reset terminal R is "0" indicating that the gate rod is descending, and counts clock pulses during generation of an output pulse when the gate rod is descending. Each time the count is performed, outputs are sequentially generated at the output terminals T _{1 to} T _n corresponding to the count number. Therefore, when the pulse indicating the energizing time at the time of descending disappears and the counting of the clock pulse ends, the LED connected to the output terminal corresponding to the count number lights up, and the energizing time at the time of descending is visually counted and displayed. .

The operator turns the changeover switch 41 of the abnormality detection circuit 4 while looking at the lighting position of the LED, and sets the number of clock pulses higher than the output terminal at the lighting position by an amount corresponding to a predetermined tolerance of the energization time. The reference value (threshold value) is defined, and the abnormality detection circuit 4 is switched and connected to the output terminal of the reference value (threshold value). By the above operation, the preliminary adjustment for detecting the gate abnormality is completed.

The gate abnormality detector of the present invention adjusted as described above and set with the reference value (threshold value) thereafter detects a gate abnormality as follows.

During normal operation without gate abnormality, the energization time during the fall is within the normal range (reference value). Therefore, the count output of the counter 21 is the output terminal position corresponding to the reference value to which the abnormality detection circuit 4 is connected by the pre-adjustment. Never reach. Therefore, the abnormality detection circuit 4 does not operate.

Now, when the gate rod is broken or the like, the weight attached to the opposite side of the fulcrum becomes relatively heavier, and the descent time of the gate rod becomes longer than the normal range. Therefore, the count number of the counter 21 also increases, and the count output is generated up to the output terminal position corresponding to the count number higher than the output terminal to which the abnormality detection circuit 4 is connected. Therefore, when the count number of the counter 21 reaches the output terminal position corresponding to the connected reference value of the abnormality detection circuit 4, the amplifier 4
2 operates, and the abnormality display alarm (detection lamp) 43 is turned on to notify the outside of the occurrence of the gate rod up / down abnormality.

In addition, in the case of detecting the gate rod ascending / descending abnormality by the energization time when the gate rod is raised, the counter 21 counts when the control input “1” (FIG. 2) is given to the reset terminal R of the counter 21. The reset control may be performed as follows. When the gate rod ascending / descending abnormality is detected by the energization time when the gate rod is descending, the control input is set to "0" as shown in FIG. Further, in the case of detecting a gate abnormality by the drive current value of the motor, as the sensor 1, instead of the illustrated rectifier 12, a conversion circuit that generates a pulse having a time width proportional to the current value detected by the current transformer 11 is adopted. do it.

Effect of the Invention The present invention has the configuration and operation as described above, and when setting the energization time or the threshold value of the drive current value for detecting the abnormalities of the gate rod ascent / descent, the operator simply turns on the lighting position of the display unit while turning it on. It is only necessary to selectively connect the abnormality detection circuit to the upper or lower output terminals by the amount corresponding to the required tolerance from the position, and the rise / fall time of the gate rod is used to detect the gate rod up / down abnormality as in the past. There is no need to strictly adjust to the specified threshold. Therefore, as compared with the prior art, on-site work is extremely simple and the workability is remarkably improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing an embodiment of a gate rod lifting / lowering abnormality detector according to the present invention, and FIG. 2 is a waveform diagram for explaining its operation. M: Gate rod drive motor, 1: Sensor, 2: Pulse count circuit, 3: Display device, 4: Abnormality detection circuit, 41: Changeover switch, 43: Abnormality display alarm device, T _{1 to} T _n : Pulse count circuit Output terminal.

Claims (1)

[Scope of utility model registration request] 1. A gate rod up / down abnormality detector comprising a sensor (1), a pulse counting circuit (2), an indicator (3) and an abnormality detecting circuit (4), wherein the sensor (1) is , A drive current of the gate rod lifting drive motor (M) is detected, and a pulse having a time width proportional to the time or current value is output for the energization time or the drive current value. The pulse output of 1) is input, the count signal is output from the output terminals (T ₁ , T ₂ , ..., T _n ), and the display (3) inputs the output of the pulse count circuit (2). The detection data is displayed by a display element, and the abnormality detection circuit (4) has a changeover switch (41) and an abnormality display alarm (43), and the changeover switch (41) causes a clock pulse when a gate rod up / down abnormality occurs. Criteria for the number of clock pulses corresponding to the number The value (threshold value) can be set in advance, and the output terminals (T ₁ , T ₂ ,
..., _Tn ), and the abnormality display alarm (43) is connected after the changeover switch (41), and operates when the output of the pulse count circuit (2) exceeds the set reference value. A gate rod up / down abnormality detector that notifies the occurrence of a gate rod up / down abnormality.