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A detection method for bolt floating of rail fasteners based on height comparison

A technology of track fasteners and detection methods, which is applied in the direction of measuring devices, instruments, and optical devices, etc., can solve the problems that cannot be automatically judged and changed, and achieve the effects of flexible use, elimination of safety hazards, and wide range of use

Active Publication Date: 2020-12-29
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

Although this patent can detect whether the bolts of the railway fasteners are loose, its main disadvantage is that these gaskets need to be installed during the construction of the rails to change the structure of the existing fasteners
Moreover, this method requires manual participation in the detection and cannot be automatically judged

Method used

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  • A detection method for bolt floating of rail fasteners based on height comparison
  • A detection method for bolt floating of rail fasteners based on height comparison
  • A detection method for bolt floating of rail fasteners based on height comparison

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In this embodiment, by measuring the height of the hexagonal bolt of the W-shaped fastener, it is used to determine whether the fastener is loose. The structure of the W-shaped fastener is as follows: image 3 shown.

[0050] Step 1: Use the 3D imaging system to obtain the 3D shape data of the fastener.

[0051] use figure 2 The shown line structured light scanning 3D imaging system acquires 3D shape data of rail fasteners. Such as figure 2 As shown, the line-structured light scanning 3D imaging system includes a line-structured light projector 1 and an area array camera 2, the positions and angles of the line-structured light projector 1 and the area array camera 2 remain fixed, and the line-structured light projector 1 generates a line structure The light sheet light is projected onto the fastener 4 perpendicular to the rail 3, forming a section profile on the surface of the fastener 4, and the section profile is photographed by the area array camera 2, and the d...

Embodiment 2

[0072] The difference from Example 1 is that the bolt height h is calculated in step 4 c The method is: set the center of the ROI of the bolt region of interest as the circle point and r5 as the radius, and calculate the mean or median value of the two-dimensional depth image pixels in the circle area as the bolt height h c , r5 is 0.5 times of r2.

Embodiment 3

[0074] The difference from Example 1 is that the bolt height h is calculated in step 4 c The method is: perform morphological filtering on the bolt region R obtained in step 3-2 to eliminate isolated noise; perform bolt cross-sectional shape fitting on the bolt region R, and extract the mean or median value of the pixels in the fitted shape region as the bolt height h c .

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PUM

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Abstract

The invention discloses a method for detecting floating of track fastener bolts based on height comparison, which belongs to the field of railway infrastructure detection. The method mainly comprisesthe following steps of: obtaining three-dimensional shape data of the track fastener and converting the date into a two-dimensional depth image; determining an area of interest of the bolts in the two-dimensional depth image; and calculating bolt height in the area of interest of the bolts, and comparing the bolt height with reference height value when the bolts are not floating, for detecting whether the bolts are floating. The method for detecting floating of the track fastener bolts disclosed by the invention has the advantages that an existing railway fastener structure is not changed, themethod is simple and reliable, use range is wide, use mode is flexible, and the like, the loose defect of the fastener can be effectively detected in advance, and running safety of the track is guaranteed.

Description

technical field [0001] The invention relates to the field of railway infrastructure detection, in particular to a method for detecting the floating of rail fastener bolts based on height comparison. Background technique [0002] The fastener is an important part connecting the rail and the sleeper. Its function is to fix the rail on the sleeper, maintain the gauge and prevent the rail from moving vertically and horizontally relative to the sleeper. Therefore, the fastener plays an important role in ensuring the stability and reliability of the track. play a very important role. Bolts are the key to ensure that the fasteners are firmly fixed. Once the bolts float and loosen, the fasteners will inevitably become loose or even detached, causing serious safety hazards. [0003] 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. With the rapid development of hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/24
CPCG01B11/24
Inventor 左丽玛
Owner 成都精工华耀科技有限公司
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