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A system and method for track surface damage detection based on speckle photography technology

A technology of surface damage and detection system, which is applied in the direction of scattering characteristic measurement, measuring device, and optical test for flaws/defects, etc. It can solve problems such as water loss of slippery boots, increased detection costs, and high requirements for operator experience, so as to achieve rapid positioning and improve The effect of probing speed

Active Publication Date: 2020-07-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The track inspection trolley adopts a combination of semi-mechanization and intelligence to detect the internal geometric state of the railway track (gauge, level, direction, height, positive and negative distortion) and external geometric state (track centerline deviation, elevation deviation), but its shortcomings Due to the short operating time window and low efficiency, the daily inspection is about 10km, and the operator has high requirements for experience
In the integrated ultrasonic flaw detection vehicle, the maximum detection speed is only 80km / h, and the wheel sensor has good adaptability to the line, especially suitable for the condition of the seamed line or the bad shape of the rail head (such as severe side grinding); the sliding shoe type The sensor has relatively strict requirements on the shape of the rail head. Side grinding and rail gaps will cause the shoe to lose water and damage the coupling, which will affect the detection effect
[0003] After retrieval, a dual-rail automatic flaw detection system (see the invention patent "Dual-rail Automatic Flaw Detection System" of the Shanghai Institute of Railway Science and Technology for details, publication date: 2012-05-09, publication number: CN102445495A) and a railway rail flaw detection Wheel probe and railway rail flaw detection method (see the invention patent "A railway rail flaw detection wheel probe and railway rail flaw detection method" issued by China Railway Corporation, the publication date is: 2018-02-23, and the publication number is: CN 107727741A) The method of measuring railway rail interface echo based on ultrasonic technology to realize the analysis of rail damage and positioning is introduced respectively. However, the disadvantage of this method is that the coupling between the ultrasonic probe and the rail still needs a couplant, which virtually increases the detection cost. Unable to realize non-contact detection

Method used

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  • A system and method for track surface damage detection based on speckle photography technology
  • A system and method for track surface damage detection based on speckle photography technology
  • A system and method for track surface damage detection based on speckle photography technology

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Embodiment 1

[0040] A track surface damage detection system based on speckle photography technology, such as figure 1 As shown, it includes: rail 1, fastener 2, concrete pillow 3, first detection unit 4-1, second detection unit 4-2, first laser displacement sensor 5-1, second laser displacement sensor 5-2 and industrial computer6. in:

[0041]The first detection unit and the second detection unit are used to emit laser light to the surface of the rail and collect speckle difference images, and are respectively located on the left and right sides of the bottom of the train. In this embodiment, the first detection unit is located on the left side of the bottom of the train to detect the left track; the second detection unit is located on the right side of the bottom of the train to detect the right track.

[0042] The first detection unit and the second detection unit are respectively packaged by sub-packages, and the bottom of the package needs to be opened to allow the light path to pass...

Embodiment 2

[0056] If the time for the train to pass through two adjacent concrete sleepers is Δt, the maximum shooting frame rate of the camera is f, and at least n images are needed between two adjacent concrete sleepers to completely detect the rail surface, then f× Δt>n, for example: if the distance between two adjacent sections of concrete is 0.6m, at least 4 images need to be collected, and when the frame rate of the CCD camera 15 is 600fps, the speed of the train can reach 315km / h.

[0057] A rail surface damage detection method based on speckle photography technology, comprising:

[0058] S1, the first laser displacement sensor and the second laser displacement sensor measure the height of the track concrete sleeper and output it to the industrial computer;

[0059] S2, the industrial computer receives the output of the first laser displacement sensor and the second laser displacement sensor, judges whether to pass through the concrete pillow, and counts the concrete pillow of the...

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Abstract

The invention belongs to the technical field of optical detection and track surface damage detection, and relates to a track surface damage detection system and method based on a speckle photography technology. The track surface damage detection system based on the speckle photography technology includes steel rails, fasteners, concrete pillows, a first detection unit, a second detection unit, a first laser displacement sensor, a second laser displacement sensor, and an industrial control computer. The first detection unit and the second detection unit are used for collecting a speckle difference image; the first laser displacement sensor and the second laser displacement sensor are used for measuring the height of the concrete pillows of a track; and the industrial control computer is used for receiving output of the first laser displacement sensor and the second laser displacement sensor, judging whether or not to pass through the concrete pillows, controlling collecting the speckledifference image on the surfaces of the steel rails, and analyzing the speckle difference image to achieve judgement of damage of the surfaces of the steel rails. The system and the method achieve non-contact detection of the damage of the surface of the track, and the detection speed is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of optical detection and track surface damage detection, and relates to a track surface damage detection system and method based on speckle photography technology. Background technique [0002] As of March 5, 2018, the operating mileage of my country's high-speed railways has increased to 25,000 kilometers, accounting for two-thirds of the world. The maximum detection speed of the rail flaw detection vehicle is only 80km / h. The wear and tear damage on the surface of the rail mainly includes crushing, peeling off blocks and wave wear. At present, the rail flaw detection technology mainly includes: rail inspection trolley, such as the GRP1000 / 3000 / 5000 of the Swiss company Amberg, China Zhengzhou Chenwei TRIG1000 railway track detector; Integrated ultrasonic flaw detection vehicles, such as SPERRY1900 in the United States and GTC-80 in China. The track inspection trolley adopts a combination of semi-mechaniza...

Claims

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Application Information

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IPC IPC(8): G01N21/88G01N21/47G01N21/01
Inventor 姚若河杨云云叶晓靖
Owner SOUTH CHINA UNIV OF TECH