Scanning device for steel rail bottom transverse cracks

Abstract

The invention discloses a scanning device for steel rail bottom transverse cracks. The scanning device comprises two ultrasonic wave probes and a scanning frame; each ultrasonic wave probe comprises a probe box, a piezoelectric crystal plate and an organic glass inclined wedge, the organic glass inclined wedge is installed in the probe box, and the piezoelectric crystal plate is installed on the outwards-inclined outside bevel of the organic glass inclined wedge; the overall scanning frame is in a bar shape, a first installing hole and a second installing hole are formed in the scanning frame, the two ultrasonic wave probes are oppositely fixed in the first installing hole and the second installing hole through bolts respectively, the included angles between the bevel edges and the bottom faces of the organic glass inclined wedges of the two probes are alpha1 and alpha2, and the distance L between the organic glass inclined wedges is calculated through the formula L=Htanbeta1+Htanbeta2, wherein H represents the height of a steel rail, and beta1 and beta2 represent refraction angles of ultrasonic waves of the two ultrasonic wave probes in the steel rail. The scanning device for the steel rail bottom transverse cracks has the advantages that whether the transverse cracks exist in the steel rail bottom can be quickly determined, and meanwhile the steel rail bottom transverse crack positions can be precisely determined.

Description

technical field [0001] The invention relates to a rail crack scanning device, in particular to a rail bottom transverse crack scanning device. Background technique [0002] At present, the detection of transverse cracks at the bottom of the rail is mainly carried out by a rail flaw detection trolley carrying front and rear 37° probes. The 37° probe is placed on the surface of the rail. The working principle of the rail flaw detection trolley is: the ultrasonic waves sent by the probe enter the rail and encounter transverse cracks at the rail bottom At the same time, the ultrasonic waves are reflected back to the probe twice, and the probe converts the ultrasonic waves into electrical signals and transmits them to the oscilloscope, where the corresponding waveforms and images are displayed. However, when the flaw detection trolley encounters a rail weld during its implementation, waveforms appear alternately on the corresponding 37° channel of the oscilloscope. For bottom tr...

AI Technical Summary

Problems solved by technology

However, when the flaw detection trolley encounters a rail weld during its implementation, waveforms appear alternately on the corresponding 37° channel of the oscilloscope. Bottom transverse cracks, the accuracy of damage location is very low by steel ruler measurement

It is difficult for the flaw detection trolley to distinguish the transverse cracks at the rail bottom at the weld seam and the weld bars at the rail bottom, which makes it difficult to detect rail flaws and easily leads to misjudgments

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