Liquid guide ultrasonic probe array flaw detection test method of train wheel

Abstract

The invention relates to an ultrasonic flaw detection method of a train wheel, and in particular relates to a liquid guide ultrasonic probe array flaw detection test method of a train wheel. The method comprises the following steps of: sequentially distributing a plurality of probes under a rail surface at intervals, and realizing the direct coupling of an ultrasonic wave with a wheel set tread through wave carrying liquid by liquid guide ultrasound; and forming a fan-shaped scanning region by each probe due to a position relationship between each probe after the region above the probe is ground by the wheel and the wheel, and synthesizing all the fan-shaped scanning regions together to form a scanning detecting region containing the whole wheel, wherein the ultrasonic wave is conducted to the wheel from the probes through a liquid medium to complete the scanning type ultrasonic flaw detection of the whole wheel in a manner of non-direct contact. The ultrasonic flaw detection method has the advantages of being extreme in coupling performance, and stable and reliable; the method is high in detecting performance, wherein the detecting density is 10-20 times as thick as that of the current array type equipment, and the quantity of the probes is 1/5-1/10 that of the current array type equipment; and the method is free from mechanical contact and mechanical motion parts, so that the equipment can be convenient to install and maintain.

Description

technical field [0001] The invention relates to an ultrasonic flaw detection method for a railway train wheel, in particular to a liquid conduction ultrasonic probe array flaw detection method for a train wheel. Background technique [0002] At present, there are two methods for on-line pass-through flaw detection of wheels. One is electromagnetic ultrasonic surface wave flaw detection. When the wheel passes through the electromagnetic ultrasonic probe, two ultrasonic surface waves traveling in opposite directions are excited on the surface of the wheel, and it is possible to find the surface 8mm below the tread. Radial defects within the range; the second is the array ultrasonic flaw detection with the patent 201020147840.8 method. Multiple sets of ultrasonic probes are continuously arranged on a section of the detection track. When the wheel rolls over the ultrasonic probe, the probe excites and generates a sound beam inside the wheel. , the area to be inspected is within ...

AI Technical Summary

Problems solved by technology

In order to ensure the fit between the probe and the arc surface of the wheel, the probe moves both in the circumferential direction and in the axial direction. The probe is in direct contact with the wheel and accompanied by the movement in the up and down direction, the circumferential direction and the axial direction, resulting in mechanical wear of the equipment. The probe The ultrasonic coupling with the wheel gap depends on the water sprayed onto the wheel surface, the coupling effect has a certain randomness, and cannot guarantee stable and reliable long-term work

In addition, the density of the probes is limited by the mechanical size of the probes. In addition, three different types of probes are used to cover the entire wheel, and the three types of arrangements need to be spaced. The distance between the probes of the same detection type becomes very large, resulting in The detection density is reduced, the repeatability of the detection is poor, and the phenomenon of misjudgment and missed detection occurs

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