JPH1111315A - Switch monitoring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the correct load torque, and to achieve the monitoring by correcting the drive current value of a drive motor based on the current in the no-load condition of the drive motor, and calculating the load torque of an electric switch based thereon. SOLUTION: The power is supplied to a drive motor M of an electric switch 1 from a power source part 2, and detected by an ammeter 3, and the load torque and the abnormal condition of an electric switch 1 are detected by a processing circuit 4b including CPU through an analog/digital(A/D) conversion circuit 4a in a processing part 4. The processing part 4 includes a correcting means, a calculating means and a judging means. The part except the original high current value in the unlocked section among the load torque in the conversion section of the electric switch 1 becomes a condition of the substantially no-load operation of the drive motor M. The no-load part is shifted to zero and corrected. The measured operating current value is corrected by the processing circuit 4b, and the load torque of the electric switch 1 is calculated corresponding to the current and torque curves for collation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch monitoring apparatus for monitoring an electric switch on a railway, and more particularly, to a switch control system for detecting a drive current of the electric switch. The present invention relates to a device capable of accurately monitoring the operation state of a computer.

[0002]

2. Description of the Related Art Conventionally, as this type of a switch monitoring apparatus, for example, as disclosed in Japanese Patent Application Laid-Open No. 2-197460, a current of a drive motor of an electric switch is detected.
It has been proposed to monitor the operating state of the electric switch based on the detected value.

[0003] In the switch monitoring apparatus according to this proposal, the drive motor of the electric switch is usually constituted by a 100-volt capacitor-started single-phase induction motor. To detect the operating state of the electric switch.

[0004]

When the torque of the electric point machine is determined from the drive current value of the drive motor of the electric point machine and the electric point machine is to be monitored, the electric point machine is required. Since the current / torque characteristics of the drive motors incorporated in each machine are different for each drive motor, there is a disadvantage that accurate load torque cannot be detected.

[0005] Further, even when it is attempted to detect the presence or absence of an abnormal state of the electric pointing machine by detecting that the drive current value of the drive motor exceeds a predetermined reference value, it is not possible to perform accurate detection. was there.

[0006] Further description will be made with reference to FIG.
(A) shows currents of drive motors (motors in the figure) M1, M2, M3 of three electric switches (not shown).
FIG. 4 is a torque characteristic diagram, wherein a predetermined drive current (operating current) i
Load torque T1, T2, T3 of each electric point machine at
Are different from each other as shown in the figure.

Therefore, when the load torque of the electric point machine is obtained from the current / torque characteristics and the drive current of the drive motor of the electric point machine, it is determined that the obtained load torque is not an accurate load torque. Has problems.

Therefore, the present invention has been made to solve the above-mentioned drawbacks, and as shown in FIG. 5B, each of the drive motors M1 and M incorporated in each electric switch.
2, utilizing the fact that the torque relationship obtained by subtracting the no-load current (the current at the position intersecting with the X axis in FIG. 5A) from the drive current of M3 is approximated, that is, the drive motor is driven by an electric switch. Applying the no-load current before being incorporated in the motor or the substantially no-load current before the drive motor incorporated in the electric switch operates the operating rod, obtains an accurate load torque. It is an object of the present invention to provide a switch monitoring device capable of performing the above-mentioned operations. It is another object of the present invention to provide a switch monitoring apparatus capable of accurately detecting an abnormality of an electric switch from a driving current by using a current at the time of no load.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, a device for monitoring a switch according to the present invention is provided with an electric switch based on a drive current value of a drive motor of the switch. And a current detecting means for detecting a drive current of the drive motor, wherein the current monitor detects an operation state of the electric point machine from the obtained load torque. Correction means for correcting the obtained drive current value based on the current when the drive motor is operated under no load,
Load torque calculating means for calculating a load torque of the electric pointing machine based on the corrected drive current value.

[0010] In order to achieve the above object, a monitoring device for a turning machine according to the present invention obtains a load torque of the electric turning machine based on a drive current value of a drive motor of the electric turning machine. What is claimed is: 1. A turning point monitoring device for monitoring an operation state of an electric turning point machine from the obtained load torque, comprising: current detection means for detecting a driving current of the driving motor; and current / torque of the driving motor. Correction means for correcting the characteristics based on the current when the drive motor is operated without load, and load torque for calculating the load torque of the electric pointing machine based on the corrected current / torque characteristics of the drive motor Calculation means.

In order to achieve the above object, a turning point monitoring device according to the present invention detects a driving current of a driving motor of an electric turning point machine, and the detected driving current matches a predetermined reference value. A point monitoring device that determines that the electric point is in an abnormal state when the electric current exceeds the current, the current detecting means for detecting a driving current of the driving motor, and a detected driving current value. Correcting means for correcting the drive motor based on the current when the load motor is operated under no load; comparing the corrected drive current value with the predetermined reference value to determine whether there is an abnormal state of the electric pointing machine. And determining means for determining.

In order to achieve the above object, a turning point monitoring device according to the present invention detects a driving current of a driving motor of an electric turning point machine, and the detected driving current has a predetermined reference value. A point monitoring device that determines that the electric point is in an abnormal state when it exceeds the current, the current detecting means for detecting a drive current of the drive motor, and the predetermined reference value A correcting means for correcting based on the current when the drive motor is operated under no load, and comparing the detected drive current value with the corrected predetermined reference value to determine whether there is an abnormal state of the electric point machine. And determining means for determining

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a switch monitoring apparatus according to one embodiment.

The drive motor M is a single-phase induction motor driven by a capacitor in the same manner as a drive motor provided in a well-known electric point machine, and operates an operating rod (not shown) of the electric point machine 1. It is used as a drive source for converting a tong rail (not shown).

The drive motor M is configured to be driven by receiving power from a power supply unit 2 composed of a 100 volt AC power supply, and the drive power supply is provided by an ammeter 3 serving as a current detecting means of the present invention. It is configured to be detected.

In FIG. 1, reference numeral 4 denotes a processing unit, which is an analog / digital (A / D) conversion circuit 4a for converting an analog current value detected by the ammeter 3 into a digital current value, and a digital conversion. And a processing circuit 4b mainly composed of a CPU for detecting a load torque and an abnormal state of the electric pointing machine 1 based on the obtained drive current value. In addition,
The processing unit 4 functions as a correction unit, a calculation unit, and a determination unit of the present invention.

Next, the monitoring control operation of the electric switch 1 will be described with reference to FIG. The curve shown by the solid line in FIG. 2A is an operating current diagram when the drive current (operating current) of the drive motor M when the electric pointing machine 1 is driven is measured.

In this operating current, a large current is obtained at the start of driving, but during the movement of the lock piece for unlocking the operating rod (in the unlocking section in FIG. 2A).
Has a characteristic that the current value is relatively flat, and the current value gradually increases during the conversion section in which the next operation rod moves to change the tong rail. Then, in the locked section when the operation rod is locked in that state after the change of the tongue rail, the current value sharply decreases.

The operation state of the electric switch 1 is monitored by monitoring the load torque state in the turning section where the operating rod moves. That is, this conversion section is a section in which the operation rod moves, and for example, when the oil between the tongue rail and the floor plate (not shown) has run out, or when foreign matter is present, friction increases. This is because it can be detected as an increase in load torque.

The portion of the lock unlocking section excluding the initially high current value is in a state in which the load on the drive motor before moving the operation rod is light, and therefore, the operation of the drive motor M in this portion is It can be seen that the driving motor M is substantially operated with no load.

The operating current indicated by the chain line in FIG.
The measured operating current curve indicated by the solid line is a corrected operating current curve in which a portion in which the drive state can be regarded as being driven with no load in the unlocking section is shifted downward to a value of 0.

Therefore, by using the corrected operating current, a load torque having a small error can be obtained as shown in FIG. 5B. For this reason, the processing circuit 4b performs correction for converting the measured operating current value shown in FIG. 2A into a corrected operating current value shown by a dashed line.

FIG. 2B is a current / torque curve diagram for comparison obtained by subtracting the no-load current from the drive current of the drive motor M stored in advance in a memory (not shown) of the processing circuit 4b. It should be noted that this curve can also be an average of the plurality of drive motors during no-load operation.

In the processing circuit 4b, the load torque of the electric pointing machine 1 is calculated by associating the corrected operating current value with the current / torque curve for verification. For example, when the maximum current in the conversion section (load torque monitoring section) of the corrected operating current curve is i, the load torque T corresponding to the i is calculated.

The calculated load torque is compared with a predetermined reference value to determine the presence or absence of an abnormal state, or is stored in a memory (not shown) of the processing circuit 4b and displayed on a display screen as required. Or printed out.

FIG. 3 shows that the measured operating current is kept as it is, and the current i flowing during the no-load operation is obtained from the measured operating current (see FIG. 3 (a)).
To correct the current / torque curve for verification (see FIG. 3B).

Accordingly, when the measured operating current is made to correspond to the corrected current / torque curve for comparison, it is possible to detect the load torque of the electric point machine 1 with a small error.

FIG. 4 shows whether the operating current (drive current) which is the basis of the load torque of the electric pointing machine 1 exceeds a predetermined threshold value (corresponding to the "predetermined reference value" of the present invention). This indicates that the abnormality determination of the electric switch 1 can be performed.

First, in FIG. 4A, the corrected operating current value is compared with a predetermined threshold value. As described above, the corrected operating current value indicates a load torque with a small error, so that an accurate abnormality determination can be performed.

When it is determined that the load current is abnormal, that is, when the corrected load current value exceeds the threshold value, the processing circuit 4
The alarm is notified to the attendant via an alarm (not shown).

FIG. 4B shows a corrected threshold value (the calculated threshold value of the present invention) obtained by shifting the predetermined threshold value upward by the current (i) during the no-load operation of the drive motor M. (Corresponding to a predetermined reference value) to compare with the operating current measured.

FIG. 4C shows that the corrected operating current is obtained by lowering the measured operating current by the difference (i) between the assumed no-load current and the actually measured no-load current. The operation current can be easily corrected by shifting the operation current.

FIG. 4 (d) also shows that the corrected operating current can be easily created. The current (i) at the time of no load is determined in advance, and the no-load current of the measured operating current curve is determined. The corrected operating current is obtained using the difference (i2-i1) from the current (i2).

As described above, since the predetermined threshold value is compared with the corrected operating current value, or the corrected threshold value is compared with the operating current value, accurate abnormality determination is performed. Can be.

[0035]

According to the present invention, there is provided a switch monitoring apparatus comprising: a current detecting means for detecting a drive current of a drive motor; and a detected drive current value based on a current when the drive motor is operated under no load. And a load torque calculating means for calculating the load torque of the electric pointing machine based on the corrected drive current value, so that accurate load torque with little error can be detected and monitored. Can be.

According to the present invention, there is provided a switch monitoring apparatus comprising: a current detecting means for detecting a drive current of a drive motor; and a current / torque characteristic of the drive motor based on a current when the drive motor is operated under no load. And a load torque calculating means for calculating the load torque of the electric pointing machine based on the corrected current / torque characteristics of the drive motor. Can be detected and monitored.

The point monitoring apparatus according to the present invention comprises a current detecting means for detecting a drive current of a drive motor, and correcting the detected drive current value based on a current when the drive motor is operated under no load. Correction means, and a determination means for comparing the corrected drive current value with the predetermined reference value to determine the presence or absence of an abnormal state of the electric point machine,
Accurate abnormality determination can be performed.

The point monitoring apparatus according to the present invention comprises a current detecting means for detecting a drive current of a drive motor, and correcting the predetermined reference value based on a current when the drive motor is operated under no load. Correction means, and a determination means for comparing the detected drive current value with the corrected predetermined reference value to determine the presence or absence of an abnormal state of the electric point machine. It can be carried out.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a switch monitoring apparatus according to an embodiment of the present invention.

2A is an operating current curve diagram, and FIG. 2B is a current / torque curve diagram.

3A is an operating current curve diagram, and FIG. 3B is a current / torque curve diagram.

FIG. 4 is an explanatory diagram showing a relationship between a threshold value and an operating current curve.

FIG. 5 is a current / torque curve diagram.

[Description of Signs] 1 Electric Pointing Machine 2 Power Supply Unit 3 Ammeter 4 Processing Unit 4a Analog / Digital Conversion Circuit 4b Processing Circuit M Drive Motor

Claims (4)

[Claims] 1. A load torque of an electric point machine is obtained based on a drive current value of a drive motor of the electric point machine, and an operation state of the electric point machine is monitored from the obtained load torque. A current detecting means for detecting a drive current of the drive motor, and a correction means for correcting the detected drive current value based on a current when the drive motor is operated under no load. And a load torque calculating means for calculating a load torque of the electric pointing machine based on the corrected driving current value. 2. A load torque of the electric point machine is obtained based on a drive current value of a drive motor of the electric point machine, and an operation state of the electric point machine is monitored from the obtained load torque. A current detector for detecting a drive current of the drive motor, and correcting a current / torque characteristic of the drive motor based on a current when the drive motor is operated under no load. And a load torque calculating unit configured to calculate a load torque of the electric pointing machine based on the corrected current / torque characteristics of the drive motor. 3. A drive current of a drive motor of the electric point machine is detected, and when the detected drive current exceeds a predetermined reference value, it is determined that the electric point machine is in an abnormal state. A current detecting means for detecting a drive current of the drive motor, and a correction means for correcting the detected drive current value based on a current when the drive motor is operated under no load. And determining means for comparing the corrected drive current value with the predetermined reference value to determine the presence or absence of an abnormal state of the electric point machine. apparatus. 4. A driving current of a driving motor of the electric pointing machine is detected, and when the detected driving current exceeds a predetermined reference value, it is determined that the electric pointing machine is in an abnormal state. A current detecting means for detecting a drive current of the drive motor, and a correction means for correcting the predetermined reference value based on a current when the drive motor is operated under no load. Determining means for comparing the detected drive current value with the corrected predetermined reference value to determine whether or not the electric pointing machine is in an abnormal state; Monitoring device.