Hollow Axle Flaw Detection System and Flaw Detection Method

Abstract

The invention provides a flaw detection system for a hollow axle. The flaw detection system comprises an ultrasonic sensor, an encoder, an UT (ultrasonic treatment) module, a probe rotation angle compensation device, an inclination and coded signal processing module and a host computer, wherein the probe rotation angle compensation device is a tilt sensor arranged in a feeler lever and outputs an analog quantity signal of the tilt sensor; the inclination and coded signal processing module receives the analog quantity signal of the tilt sensor and a digital pulse signal of the encoder, converts the signals into a deflection angle of the feeler lever and a rotation angle of a probe respectively and outputs the angles to the host computer; the host computer compensates the rotation angle of the probe according to the deflection angle of the feeler lever so as to determine the flaw detection position of the hollow axle. The invention further provides a flaw detection method based on the flaw detection system for the hollow axle. According to the flaw detection system for the hollow axle and the flaw detection method, the problem of probe angle errors caused by deflection of the feeler lever in a flaw detection process is solved, the flaw detection position can be determined accurately, the flaw detection accuracy can be improved, meanwhile, the deflection state of the feeler lever is monitored effectively, and the service life of the feeler lever is prolonged.

Description

technical field [0001] The invention relates to a hollow axle flaw detection system and a flaw detection method. More specifically, the present invention relates to a hollow axle flaw detection system and flaw detection method for accurately locating defect positions by detecting the deflection angle of the probe rod to compensate the rotation angle of the probe. Background technique [0002] At present, the hollow axle flaw detection of EMUs has become an important maintenance procedure to ensure the safe operation of trains. The internationally common hollow axle flaw detection technology uses a probe rod and installs ultrasonic transmitting and receiving probes on the top of the probe rod. The probe part is installed on the probe rod through the motor connection probe frame. In the flaw detection operation, as the probe rod is slowly advanced along the axial depth to the inside of the axle, and the probe at the front end is slowly rotating, the ultrasonic signal can rea...

AI Technical Summary

Problems solved by technology

However, because the probe rod is connected to the main body of the flaw detector by the drag chain, there is a certain room for movement in the connection

Therefore, in some unpredictable and uncontrollable situations, the rotating force of the probe will cause the probe rod to deflect or swing slightly

Although the swing amount is small, it will cause errors in the rotation angle positioning of the probe, and ultimately affect the accuracy of flaw detection

At the same time, because the probe rod is in a stressed state for a long time, it will cause strain on the drag chain and directly affect the life of the probe rod

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