Switch machine indication bar notch width monitoring system and eddy current sensor thereof

Abstract

The invention discloses a switch machine indication bar notch width monitoring system and an eddy current sensor thereof. The eddy current sensor comprises an eddy current probe and an eddy current circuit; the eddy current circuit comprises an oscillator module, a detection module, a temperature compensation module and an output buffer module. The eddy current sensor is characterized in that high frequency oscillating current passes the eddy current probe, alternating magnetic field is generated in the head of the eddy current probe, the alternating magnetic field changes with moves of a metal conductor when the metal conductor moves in an effective range of the alternating magnetic field, a change in the alternating magnetic field is converted into a voltage or current change, the oscillator module is used for producing an oscillation signal and outputting the oscillation signal to the detection module, the detection module is used for rectifying and filtering an alternating-current voltage signal output by the oscillator module into a stable direct-current voltage signal, the temperature compensation module is used for compensating temperature, and the output buffer module is used for amplifying and outputting the higher-level direct-current voltage signal. The eddy current sensor allows a change in a gap between a check post and a notch of a check block to be acquired in real time.

Description

Technical field [0001] The invention belongs to the technical field of electronic communication, and relates to a system for monitoring the notch width of a switch switch machine, in particular to an eddy current sensor used for monitoring the notch width of the switch switch machine. Background technique [0002] The normal working condition of the railway switch point machine is very important to ensure the normal operation of the railway. In the future, the operation of large axle load trains and the further increase in transportation volume will cause more frequent impacts on the switch equipment and increase the vibration intensity. , Wear and tear, geometric changes, the research of monitoring the working condition of the railway switch point machine has never been interrupted for more than ten years. At present, the main parameters for monitoring the working state of the point machine at home and abroad are the conversion resistance and the width of the bar notch. Resistan...

AI Technical Summary

Problems solved by technology

[0003] The existing monitoring methods for the gap width of the indicator rod all have their shortcomings: such as the touch bead sensor technology and the spring displacement sensor technology, the detection device is easily damaged, the photoelectric encoder technology is easily polluted and the accuracy is reduced, and the reflective optical fiber displacement Sensor technology and Hall displacement sensor technology. The probe is too large and inconvenient to install. The camera technology method does not quantify the detection results and requires manual judgment to indicate the width of the rod gap.

[0004] At the same time, the existing commonly used monitoring method is the camera technology method, which requires a special communication line along the rail, the system cost is relatively high, and there is no quantitative detection result, and manual judgment is required to indicate the gap width of the pole. Personal subjective factors, imprecise, large error

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