Ultrasonic flaw detection method and device for upper arcs and lower jaw areas on both sides of rail head

Abstract

The invention relates to an ultrasonic flaw detection method and a device for upper arcs and lower jaw areas on both sides of a rail head. Each upper arc and lower jaw area on both sides of the rail to-be-tested is provided with an artificial defect of flat-bottomed hole. Each lower jaw ultrasonic probe of the ultrasonic flaw detection device on the rail head is successively pressed down to both sides of the rail tread, and the lower jaw ultrasonic probe emits ultrasonic waves downward, the rail moves, to perform the flaw detection on the lower jaw of the rail, when the rail passes through twosets of the ultrasonic flaw detection device of lower jaw on the rail head. Each ultrasonic probe for upper arc is successively raised to the two lower jaw faces of the rail, and the two ultrasonic probes for the upper arcs emit ultrasonic waves upward, the rail moves, to perform the flaw detection on the upper arcs of the rail, when the rail passes through two sets of the ultrasonic flaw detection device of upper arcs on the rail head. According to the ultrasonic flaw detection method and the device for upper arcs and lower jaw areas on both sides of the rail head, the method and the devicehave the advantages that the detection of the blind spot of the ultrasonic flaw detection on the upper arcs and the lower jaw areas of the rail head is realized, and that the cross section of the railhead covered by ultrasonic wave >=90% is realized.

Description

technical field [0001] The invention belongs to the field of non-destructive flaw detection of rails, and in particular relates to an ultrasonic flaw detection method and device for the upper circular arc and the lower jaw area on both sides of the rail head. Background technique [0002] The upper arc area of ​​the rail head is in direct contact with the railway wheels, and the force between the wheels and rails is large and complex. The lower jaw area of ​​the rail head is frequently stretched and compressed under the action of the wheel pressure. The above two areas are prone to defects on the railway line. Area. The existing online automatic ultrasonic flaw detection technology for rails in China can only detect the core area of ​​the rail head. The two upper arcs and the lower jaw area of ​​the rail head are the flaw detection detection blind areas of the existing online automatic ultrasonic flaw detection technology for rails. The existing technology ultrasonic coverag...

AI Technical Summary

Problems solved by technology

The existing online automatic ultrasonic flaw detection technology for rails in China can only detect the core area of ​​the rail head. The two upper arcs and the lower jaw area of ​​the rail head are the flaw detection detection blind areas of the existing online automatic ultrasonic flaw detection technology for rails. The existing technology ultrasonic coverage Rail head cross section 70%

However, Australian standard rails and high-speed rails have higher requirements. The ultrasonic flaw detection coverage area on the rail cross section must meet: rail head ≥ 90%, and the current conventional rail flaw detection methods cannot meet the requirements

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