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Railway fastener abnormality detection system based on monocular vision and laser speckles

A laser speckle, monocular 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, eliminate foreign objects on the railway, and reduce the computational complexity.

Pending Publication Date: 2018-02-13
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 fastener abnormality detection system based on monocular vision and laser speckles
  • Railway fastener abnormality detection system based on monocular vision and laser speckles
  • Railway fastener abnormality detection system based on monocular vision and laser speckles

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Such as figure 1 As shown, a rail fastener anomaly detection system based on monocular vision and laser speckle is characterized in that: two laser speckle projectors Sa4-1 and Sb4-2, two cameras Ca5-1 and Cb5- 2. Four laser displacement sensors La8-1, Lb8-2, Lc8-3, Ld8-4, 1 wheel encoder 6, 1 RFID detector 7 and 1 industrial computer 9, among which the laser speckle projection The detector Sa4-1 and the camera Ca5-1 are located on the left side of the bottom of the train, forming the first measurement unit 21 to detect the fasteners 2 on both sides of the left rail 1; the laser speckle projector Sb4-2 and the camera Cb5-2 are located on the train The right side of the bottom constitutes the second measurement unit 22, which detects the fasteners 2 on both sides of the right rail 1; the laser speckle projector 4 and the camera 5 are located directly above the rail 1; the laser speckle projector 4 projects a speckle pattern 19 to the surface of the fastener 2, the camer...

Embodiment 2

[0074] 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

[0076] The difference from Embodiment 1 is that the four laser displacement sensors 8 adopt another installation method: as Figure 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 ...

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Abstract

The invention discloses a railway fastener abnormality detection system based on monocular vision and laser speckles. The railway fastener abnormality detection system is used for detecting whether fasteners are abnormal or not and comprises laser speckle projectors, area array cameras, a wheel encoder, an RFID detector and an industrial personal computer, wherein the laser speckle projectors andthe area array cameras are arranged above a bottom sleeper of a train body, the laser speckle projectors are positioned right above the fasteners and project laser speckles towards fastener areas perpendicularly, the wheel encoder is fixed on a rotating shaft of a wheel and connected with the area array cameras, the RFID detector is fixed below the train body, and the industrial personnel computerpositioned in a carriage is connected with the area array cameras, the wheel encoder and the RFID detector. The railway fastener abnormality detection system has the advantages that with mottled grains on the surfaces of the fasteners increased through the laser speckle projectors, image block matching precision can be improved and the three-dimensional topography of the fasteners is constructedaccurately, so that various abnormalities of different types of fasteners can be detected effectively.

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 monocular 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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Patent Type & Authority Applications(China)
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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