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Railway track fastener anomaly detection system based on binocular vision and laser speckle

A laser speckle and binocular vision technology, applied in railway car body parts, railway vehicle shape measuring instruments, optical test flaws/defects, etc. The fastener gasket is missing and the fastener elastic strip is partially damaged, which can increase the artificial texture, reduce the computational complexity and improve the efficiency.

Pending Publication Date: 2018-02-16
成都精工华耀科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the multi-parallel light strip shape modulation method adopted by this type of method is difficult to detect the shape change of the unirradiated area of ​​the light strip. Therefore, it can only detect large-scale defects such as missing fasteners, and cannot detect half-shedding fasteners, Defects such as lack of fastener gaskets, local damage to fastener springs, etc.

Method used

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  • Railway track fastener anomaly detection system based on binocular vision and laser speckle
  • Railway track fastener anomaly detection system based on binocular vision and laser speckle
  • Railway track fastener anomaly detection system based on binocular vision and laser speckle

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Such as figure 1 As shown, a rail fastener anomaly detection system based on binocular vision and laser speckle, consists of two laser speckle projectors Sa4-1 and Sb4-2, four cameras Ca5-1, Cb5-2, Cc5- 3. Cd5-4, composed of four laser displacement sensors La8-1, Lb8-2, Lc8-3, Ld8-4, a wheel encoder 6, an RFID detector 7 and an industrial computer 9, in which laser speckle projection Detector Sa4-1, camera Ca5-1 and Cb5-2 are positioned at the left side of train bottom, constitute the first measurement unit 21 (as Figure 9 As shown), the fasteners 2 on both sides of the left rail 1 are detected; the laser speckle projector Sb4-2, the cameras Cc5-3 and Cd5-4 are located on the right side of the bottom of the train, constituting the second measurement unit 22. The fasteners 2 on both sides of the rail 1 are tested; figure 2 As shown, the laser speckle projector 4 is located directly above the rail 1, and projects the laser speckle 19 to the rail 1 and the fasteners 2 ...

Embodiment 2

[0071] The difference from Example 1 is that, as Figure 9 As shown, the detection device also includes: the first and second measuring units 21 and 22 use hard rubber pads 26 or plastic gaskets as passive damping structures 25 and are fixed to the support beam 23, between the support beam 23 and the train bogie 24 K springs are connected in parallel, and the value of k ranges from 1 to 10.

Embodiment 3

[0073] The difference from Embodiment 1 is that the four laser displacement sensors 8 adopt another installation method: as Image 6 As shown, the laser displacement sensor La8-1 is located in the first or second measuring unit 21 and 22 public field of view, the road plane 11 is perpendicular to the central axis 12 plane of the rail, and the laser displacement sensor Lb8-2 is arranged longitudinally along the rail 1 At the position of laser displacement sensor La8-1d1, the horizontal distance between laser displacement sensors La8-1 and Lb8-2 and the center line of rail 1 is equal to d2; laser displacement sensors Lc8-3 and Ld8-4 are parallel to La8-1 and Lb8-2 The connecting line is placed above the central axis 18 of the railway to measure the height of the upper surface of the sleeper 17. The distance between Lc8-3 and Ld8-4 is 1 / 2 of the width of the upper surface of the sleeper 17; La8-1 and Lc8-2 are located on the front side of the train , Lb8-3 and Ld8-4 are located o...

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Abstract

The invention discloses a railway track fastener anomaly detection system based on binocular vision and laser speckle, comprising laser speckle projectors, cameras, laser displacement sensors, a wheelencoder, an RFID (radio frequency identification) detector and an industrial personal computer, wherein the laser speckle projectors and the cameras form a binocular stereo vision speckle imaging system for performing three-dimensional stereo measurement on fasteners; the laser displacement sensors are used for measuring mounting supporting heights of the fasteners so as to control imaging of thecameras; the wheel encoder and the RFID detector are used for measuring mileage; the industrial personal computer is used for acquiring and processing images and detecting whether the fasteners are abnormal by means of binocular vision stereo matching. The railway track fastener anomaly detection system based on binocular vision and laser speckle has the advantages that a laser speckle source isused to manually add speckle lines to the surface of fasteners, image block matching precision can be improved, three-dimensional shapes of the fasteners are accurately reconstructed, and various anomalies of different types of fasteners can be effectively detected.

Description

technical field [0001] The invention relates to equipment in the field of railway infrastructure detection, in particular to a rail fastener anomaly detection system based on binocular vision and laser speckle. Background technique [0002] Fasteners are components that connect rails and sleepers to form rail rows, and play an important role in ensuring track stability and reliability. In terms of railway infrastructure testing, my country has long been dominated by manual and static testing, with high maintenance costs, high strength, and poor safety. In recent years, my country's high-speed railways have developed rapidly, and higher requirements have been put forward for the automation and real-time performance of railway testing. The existing fastener detection technology at home and abroad is: continuous scanning device based on linear array laser, such as German Sick company; computer vision detection device based on area array image sensor, such as VIS system of Ameri...

Claims

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Application Information

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IPC IPC(8): G01N21/88B61K9/08
CPCG01N21/8851B61K9/08
Inventor 不公告发明人
Owner 成都精工华耀科技有限公司
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