JPH02197460A - Point supervisory unit - Google Patents

Abstract

PURPOSE:To surely detect abnormality before a fault by measuring an operating current in an electric point and detecting generation of the abnormality when at least one of the peak value, peak position, mean value, operating time and the number of operating times is displaced from a permissible value in this measured operating current. CONSTITUTION:An operating current is measured of a point by a sensor part 2 penetrating through an electric motor of the point, thus in accordance with the measured current, the point action is supervised. The current, measured in the sensor part 2, is supplied to a microcomputer part 7 through an amplifier part 5 and an A/D converter part 6. The microcomputer part 7 fetches a data to be stored in a memory means 7a while stores and compares with a threshold value each condition, respectively consisting of a current peak value, peak position, mean value, operating time and a number of operating times, in a threshold value memory means 7b, comparing means 7c and an operating pattern extracting means 7d. As a result, when at least one of the conditions is out of the permissible value, generation of abnormality is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a switch machine monitoring device for monitoring electric switch machines in railway signals.

[Prior Art] Railway switch machines use AC induction motors, the mechanical output and torque of which are proportional to the square of the current. The output is transmitted to the turnout via a friction clutch. The purpose of this clutch is to protect the motor, so that it does not receive a shock when starting up, and also to allow it to idle when an excessive load is applied. Therefore, by measuring the operating current of the motor, it is possible to know whether the operating state of the point machine is normal or not.

For this reason, in the past, regular patrols were carried out at night when train service was interrupted, and the switch machine was operated using a manual switch, and the current and switching time were measured. - Performing maintenance such as loosening nuts and refueling.

[Problem to be solved by the invention] Once a switch malfunctions, it has a great impact on train operation, so detecting malfunctions in advance is extremely important for normal train operation, and maintenance Although it is possible to predict failures in advance to some extent by increasing the number of times, there are limits to this.

[Means for Solving the Problems] In order to solve such problems, the present invention detects when at least one of the peak value, peak position, average value, and number of operating times of the current deviates from a permissible value. It is equipped with an abnormality detection circuit.

[Effect] Abnormalities can be determined before they occur.

[Embodiment] Fig. 1 is a system diagram showing an embodiment of the present invention, in which a current sensor (by winding a large number of secondary coils around a high permeability toroidal core) is passed through the electric motor 1a of the switch machine 1. ,
The device is composed of a terminal device 3 (which obtains a voltage proportional to the through-current) and a terminal device 3 which processes current information, and the data is sent to the central office via a transmission line 4.

FIG. 2 is a block diagram of the hardware. The current information detected by the sensor 2 is amplified by the amplifier section 5, noise is removed by a filter, and then supplied to the microcomputer section 7 via the A/D conversion section 6. ．． The microcomputer section 7 takes in and stores data in the storage means 7a, and also stores the data in the threshold storage means 7b,
The comparison means 7c and the operation pattern extraction means 7d store the current peak value, peak position, average value, operation time, and number of operations, and compare them with threshold values. In addition, switch 9
is used to set the device number, and the conversion section 8 is used to convert the output signal from the microcomputer section into a format suitable for the transmission line.

Figure 3 shows measurement data obtained from the sensor, which is A/D converted and then stored in memory. When current is supplied to the motor, a starting current flows and the first peak appears. After that, a nearly constant current flows, and a second peak appears just before the power is turned off. This is a characteristic of a normal switch machine and occurs every time the switch machine changes.

Figure 4(a) shows the state in which the peak current is extracted.
b) shows peak time extraction, and the time from the beginning of current flow to the second peak position is determined. Figure 4(c)
shows how the rolling time is extracted, and the time from the beginning to the end of the current flow is extracted. FIG. 4(d) shows how the average current is extracted, and after masking the hatched portion of the first peak from the beginning of the current flow, the average from the beginning to the end is taken as the average current.

FIG. 4 is a block diagram showing the main parts of signal processing.
As shown in the figure, the extracted data is compared in comparison means 7c in microcomputer section 7 with control limit pattern 7f consisting of threshold value storage means 7b and operation pattern extraction means 7d. If there are any signs of malfunction in the point machine, there will be some changes in the extracted data. For example, when a sliding part runs out of oil, the switching time becomes longer and the average time increases. For this reason, if at least one of the specifications is outside the control limits, the result is transmitted to a central station (not shown) via the transmission means 7e. This allows the central station to constantly monitor the operating status, allowing it to detect failures in advance and take optimal measures before they occur.

[Effects of the Invention] As explained above, in this invention, data is transmitted to the central station when at least one of the specifications of the current value deviates from a predetermined value, so that the switch machine does not malfunction. This has the effect of being able to detect problems before they occur.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention; FIG. 2 is a block diagram; FIG. 3 is a waveform diagram of various parts; and FIG. 4 is a block diagram of main parts. 1... Point machine, 2... Sensor, 3... Terminal device, 4... Transmission line, 5... Amplifier section, 6
...A/D conversion section. 7...Microcomputer section. Patent applicant Shikoku Railway Company Kyosan Seisakusho Co., Ltd. Agent Kazuko Yamakawa (and 2 others) Figure 1 Figure 3

Claims (1)

[Claims] In a switch monitoring device that monitors the operation of an electric switch of a railway signal safety device by measuring the operating current using a current sensor, the peak value of the current, A switch machine monitoring device comprising an abnormality detecting means for detecting that at least one of a peak position, an average value, an operating time, and the number of operating times deviates from an allowable value.