Steel rail section central axis detection method and system and steel rail section centering detection method and system

Abstract

The invention relates to the field of railway track detection, and provides a steel rail section central axis detection method and system, a steel rail centering detection method and system and a steel rail flaw detection vehicle. The section central axis detection method comprises the steps that the outline (5) of a steel rail section is shot on one side of a steel rail, and the outline (5) of the steel rail section comprises a rail web outline (52) and a rail head outline (51); the rail web outline (52) is acquired from the outline (5) of the steel rail section; and the rail web outline (52) matches a standard contour (8) to obtain the central axis (7) of the section of the steel rail. By adopting the method, the central axis of the section of the steel rail can be quickly and accurately judged, and the flaw detection efficiency is improved.

Description

technical field [0001] The invention relates to the field of railway track detection, in particular to a rail alignment detection method and system, a rail flaw detection method and a flaw detection vehicle. Background technique [0002] With the rapid development of my country's railway tracks, rails need to carry a large number of transportation tasks every day, and damage to rails is inevitable. The rail flaw detection vehicle carries the damage detection task of the rails in service and plays an important role in ensuring the safety of railway transportation. [0003] When the existing rail flaw detection vehicle performs flaw detection operations, such as figure 1 As shown, the ultrasonic probe 1 is usually aimed at the center line of the rail waist of the rail 2, and the ultrasonic probe 1 judges whether the rail 2 is damaged by the strength of the received rail bottom echo signal. Such as figure 2 As shown, if the ultrasonic probe 1 deviates from the center line o...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: (1) the laser displacement sensor is used to measure the distance, and the anti-interference ability of the centering system is poor, such as rail joint splints, turnouts, sundries and other interferences will cause misoperation of the servo motor; (2) due to The rail head is easy to be worn when the rail is in service, and the rail centerline calculated by the worn rail head profile will deviate from the actual rail centerline, and the reliability is not good; (3) the experiments in this literature show that with the As the speed increases, the automatic centering performance will decrease. In order to improve the centering accuracy, the speed of the flaw detection vehicle must be reduced. Due to the decrease in the efficiency of the flaw detection vehicle, it will inevitably affect the normal transportation of trains.

This method has the following disadvantages: (1) This method has different calculation standards for seamless lines and seamed lines, and is not universally applicable

(2) The profile of the rail is only based on a small piece of data (such as rail waist or rail head), and it is easy to cause low detection accuracy for large side grinding (such as curves)

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