Portable electromagnetic ultrasonic crack detector for locomotive wheel pair tread

Abstract

A portable electromagnetic ultrasonic flaw detector for wheel set treads of rolling stock. The ultrasonic frequency signal generated by the ultrasonic frequency signal generator in the main engine is sent to the power amplifier by the logic control unit for amplification, and then generated on the surface and near surface of the wheel set by the electromagnetic ultrasonic transducer. Ultrasonic surface wave, the ultrasonic surface wave propagates along the surface of the wheel set, and the ultrasonic surface echo is received by the electromagnetic ultrasonic transducer; it is sent to the programmable amplification unit in the host for amplification, and converted into digital by the analog-to-digital converter. The signal is directly sent to the memory for storage through the logic control unit and / or processed by the digital signal processing unit and then sent to the memory for storage through the logic control unit. The flaw detector can automatically realize a one-time full-coverage scan of the wheel tread circumference. It is not necessary to clean the surface of the wheel to be tested during the detection, and no coupling agent is required during the detection. Work, and easy to carry, especially suitable for grass-roots stations and segments.

Description

Technical field [0001] The invention relates to an ultrasonic flaw detection device, in particular to an electromagnetic ultrasonic flaw detector for wheel set tread defects of locomotives and vehicles. Background technique [0002] In recent years, with the rapid development of my country's national economy, the running speed of trains has increased year by year. The speed-up operation of the train puts forward higher requirements on the quality of the train. As an important part of the train, the wheelset, especially the defects such as scratches, peeling, and cracks on the surface of the tread and near the surface, are major factors that endanger driving safety. Therefore, it is necessary to detect the wheel at any time, especially to detect whether there is a defect in the wheel tread. This is an extremely important daily and recurring job. [0003] The traditional wheel set tread defect detection method mainly relies on manual detection, the detection results are hig...

AI Technical Summary

Problems solved by technology

None of them can directly detect the defects in the continuous shell layer on the surface of the wheel tread and near the surface. It needs to scan continuously along the surface in the state of disintegration of the wheel (falling wheel) to realize the continuous flaw detection of the wheel surface, and it is impossible to perform dynamic automatic continuous detection. detection

[0004] When the piezoelectric ultrasonic detector is used, it is necessary to clean the surface of the object to be tested, remove surface dirt and anti-rust paint and other pretreatments; after the test is completed, according to the relevant railway regulations, the surface must also be post-treated, such as coating anti-rust Paint, etc., the detection time is long, there are many supporting procedures, and the efficiency is low

In the detection process, in order to improve the coupling efficiency, a couplant must be used, which brings inconvenience to the field detection application

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