High-speed non-destructive testing method for rail surface defects and its implementing device

Abstract

The invention provides a high-speed non-destructive testing method and realization device of rail surface defects. The method uses the jet flame as the excitation source to heat the rail surface at a certain angle to its moving direction, and the infrared thermal imager inputs the real-time collected infrared images into the computer to achieve rapid positioning, imaging and quantitative identification of rail surface defects . The non-destructive testing device includes a flame heating module fixed on the device base, an adjustment mechanism for adjusting the flame spray angle, an infrared thermal imager, a flame control module, a synchronization control module and a computer. The invention adjusts and controls the flame injection speed and temperature through the flame control module, adopts the flame nozzle body enveloping the surface of the rail and the array flame nozzles arranged on the inner side to realize the flame shape control, and optimizes the incident angles at different speeds, thereby achieving the The surface of the rail is heated quickly and uniformly, which realizes high-speed non-destructive detection of surface defects of the rail, and has the advantages of fast detection speed and low cost.

Description

technical field [0001] The invention relates to the technical field of on-line non-destructive testing of rail surface defects, and more particularly, to an active infrared thermal imaging detection method based on jet flame heating or "lighting up" surface defects of rails and an implementation device thereof. [0002] technical background [0003] The rail is the main component of the railway track. During the long-term service, it is rolled by the train wheelset, and defects such as fatigue cracks, flat scars, and rail head peeling are prone to occur on the surface and shallow areas of the rail. If it is not detected and discovered in time, and reasonable grinding and maintenance are given, the originally small defects may expand, and even cause the rail to break, which will eventually lead to major accidents such as train derailment and overturning. In order to prevent the occurrence of rail fractures and timely repair and maintenance, a variety of non-destructive testing...

AI Technical Summary

Problems solved by technology

However, it still cannot meet the detection speed requirement of 80km / h for high-speed railway rail detection.

At the same time, in order to obtain a better detection effect, the distance between the induction coil (or yoke) and the rail surface is usually required to be controlled at about 1-2mm, which makes the use of ECPT for online detection of rails a certain safety hazard; and the detection results are easily affected. The impact of emissivity changes caused by dust, water droplets on the surface of the tested rail, and the surface topography of the rail

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