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A Loose Detection Method for Rail Fastener Nuts Based on Height Comparison

A technology of track fasteners and detection methods, which is applied to tracks, track maintenance, roads, etc., can solve problems such as changes and inability to automatically identify, and achieve the effects of eliminating potential safety hazards, flexible use methods, and a wide range of applications

Active Publication Date: 2020-09-08
成都精视华耀科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this patent can detect whether the nuts 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 Loose Detection Method for Rail Fastener Nuts Based on Height Comparison
  • A Loose Detection Method for Rail Fastener Nuts Based on Height Comparison
  • A Loose Detection Method for Rail Fastener Nuts Based on Height Comparison

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] use image 3 The W-shaped fastener shown is illustrative of this embodiment.

[0055] Step 1: Use a 3D imaging system to obtain 3D shape data of rail fasteners;

[0056] use figure 2 The shown line structured light scanning 3D imaging system acquires 3D shape data of rail fasteners. like 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 distance between the light sheet light plane and the area array camera 2 is The geometric position relationship can calculate the coordinates of th...

Embodiment 2

[0073] The difference from Example 1 is that in step 4, the following method is used to calculate the nut height value:

[0074] Step b-4-1: Set the threshold T 1 , perform threshold segmentation on the pixels in the nut ROI to obtain the region R;

[0075]

[0076] Among them, f(x, y) represents the pixel gray value at (x, y) in the nut ROI, and the threshold T 1 =v max -a, where v max Indicates the maximum pixel gray value in the nut ROI, a=5;

[0077] Step b-4-2: Calculate the circumcircle radius r4 of the area R, when r4>r2+e1, calculate the average or median value of the pixels in the area R, as the nut height h c , otherwise go to step 4-3, e1=5.

[0078] Step b-4-3: Carry out circular fitting to the region R, take the center of the circle as the center, set a concentric ring C with radii r5 and r6, r5=r2+e2, r6=r3-e3, Take the average or median value of the pixels in the area of ​​the ring C as the nut height h c ;

[0079] Among them, e2=5, e3=5; r2 is the r...

Embodiment 3

[0081] The difference from Example 2 is that in step b-4-2, when r4>r2+e1, take the non-zero pixel value with the most occurrences in the region R as the nut height h c .

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Abstract

The invention discloses a detection method for looseness of a track fastener nut based on height comparison, and belongs to the field of railway infrastructure construction detection. The detection method comprises the main steps that three-dimensional shape data of a track fastener is acquired and converted into a two-dimensional depth image; and the nut ROI is determined in the two-dimensional depth image, and the nut height is calculated in the nut ROI and compared with the reference height when the nut is not loosened to detect whether the nut is loosened or not. The detection method is convenient to use, does not change a structure of existing railway fasteners, can detect the looseness of various types of fastener nuts, and can effectively guarantee railway operation safety.

Description

technical field [0001] The invention relates to the field of railway infrastructure detection, in particular to a method for detecting loose nuts of rail fasteners 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 and nuts are the key to ensure that the fasteners are firmly fixed. Once the bolts or nuts become loose, the fasteners will inevitably loosen, which will cause 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 high-speed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01B35/12
CPCE01B35/12
Inventor 左丽玛
Owner 成都精视华耀科技有限公司
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