Signal acquisition circuit, signal acquisition device and signal acquisition system applicable to magnetic steel online fault diagnosis

Abstract

The invention provides a signal acquisition circuit, a signal acquisition device and a signal acquisition system applicable to magnetic steel online fault diagnosis. The signal acquisition circuit comprises a signal connecting module, a magnetic steel noise signal acquisition module and a magnetic steel internal resistance signal acquisition module, wherein input of the signal connecting module is connected with two ends of a magnetic steel coil, and output of the signal connecting module is connected with a channel switching module and connected with a corresponding signal acquisition module according to diagnosis requirement; the magnetic steel noise signal acquisition module is connected with the output of the signal connecting module through the channel switching module when magnetic steel noise detection is required to be performed, so as to acquire a magnetic steel noise signal, amplify the magnetic steel noise signal and then output the amplified magnetic steel noise signal; and the magnetic steel internal resistance signal acquisition module is connected with the output of the signal connecting module through the channel switching module when magnetic steel internal resistance detection is required to be performed, so as to acquire a magnetic steel internal resistance signal, perform filtration and impedance conversion on the magnetic steel internal resistance signal and then output the magnetic steel internal resistance signal. The signal acquisition circuit, the signal acquisition device and the signal acquisition system are capable of avoiding a situation that management data of other tracks are influenced when diagnosis is performed through more shafts or less shafts in the prior art.

Description

technical field [0001] The invention relates to equipment maintenance technology in the railway transportation management process, in particular to a signal acquisition circuit, device and system suitable for online fault diagnosis of magnetic steel. Background technique [0002] In the process of railway transportation management, wheel sensors are widely used together with radio frequency identification (RFID) equipment to judge and count the axles of trains in operation, and combined with the 5T system to monitor and control train vehicles in real time. As the most basic equipment in all systems, wheel sensors are fundamental to the normal operation of all equipment. At present, the widely used wheel sensor uses the principle of electromagnetic induction to wind the coil around the NdFeB permanent magnet. When the train vehicle passes above the permanent magnet, the magnetic field in the permanent magnet will change, so that the induced electromotive force will be generat...

AI Technical Summary

Problems solved by technology

However, with the aging of the magnetic steel coil and the weakening of the magnetism of the permanent magnet, the detection sensitivity of the corresponding wheel sensor will be reduced or even misjudged, and there will be multiple or few axes.

At present, the wheel sensor failure is only judged by the multi-axis and few-axis data of the passing vehicle. This method affects the normal function of the system at the expense of data accuracy.

Images