Method for detecting looseness of rail splice fastener

A detection method and fastener technology, applied in image data processing, instruments, calculations, etc., can solve problems such as loosening, reducing the connection and fixing effect of two rails, affecting the safety of track operation, and achieving the effect of ensuring safety

Active Publication Date: 2018-11-16
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

During the operation of the train, the rail joints are impacted and squeezed, which can easily loosen the fasteners of the fishplate, reduce the connection and fixing effect of the two rails, and affect the safety of the track operation

Method used

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  • Method for detecting looseness of rail splice fastener
  • Method for detecting looseness of rail splice fastener
  • Method for detecting looseness of rail splice fastener

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A method for detecting looseness of rail fishplate fasteners, specifically as follows:

[0049] Step 1: Use the 3D imaging system to obtain the 3D topography data of the rail side.

[0050] Such as figure 2 As shown, two sets of 3D imaging systems 1 are used to perform 3D imaging of the areas on both sides of the rail 2 to obtain structural 3D topography data including the rail 2, fishplate 5, nut 3, and screw 4. The 3D imaging system here is a line-structured 3D scanning system.

[0051] Step 2: If figure 2 As shown, take the vertical plane perpendicular to the track plane and parallel to the track direction as the horizontal reference plane 6 of the depth image, and convert the three-dimensional topography data into a two-dimensional depth image; the bit width of the two-dimensional depth image is 8 bits, and the unit pixel value The height resolution is 0.1mm.

[0052] Step 3: On the two-dimensional depth image, according to the size information of the rail sid...

Embodiment 2

[0070] The difference from Example 1 is that in step a-5-7, the black and white pattern of a regular polygon whose circumcircle radius is r3 is used as a template T, the white area is a regular polygon, and the black area is a background, with C(x c ,y c ) is a dot, set the angle search range of -k1~k1 degrees, and the search step is k2 degrees, compare the similarity between the area G and the template T, find the most similar angle, and use it as the nut angle β c , the value range of k1 is 0-120 degrees, and the value range of k2 is 0-60 degrees.

Embodiment 3

[0072] The difference with embodiment 1 is that the height h of the nut 3 is calculated in step 5 c The method is:

[0073] Step b-5-1: Perform threshold segmentation on the depth pixels in the fastener area to obtain the area R:

[0074]

[0075] Among them, f(x,y) represents the gray value of the depth image pixel at (x,y) in the fastener area, v max is the maximum gray value of the depth image pixel in the fastener area, a=10;

[0076] Step b-5-2: Perform morphological filtering on the region R to eliminate isolated noise, calculate the circumcircle radius r5 of the region R, and when r5>r2+e2, calculate the average or median value of the pixels in the region R as the nut height h c , otherwise go to step b-5-3;

[0077] Step b-5-3: Carry out circular fitting on the region R, take the center of the circle as the center, set concentric rings with radii r6 and r7, r6=r2+e3, r7=r3-e3, in Take the average or median value of the pixels in the ring area on the depth image...

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Abstract

The invention discloses a method for detecting looseness of a rail splice fastener and belongs to the field of detection on railway infrastructures. The method comprises the following main steps: acquiring three-dimensional shape data of a side surface of a track by adopting a three-dimensional imaging system, and converting the three-dimensional shape data into a two-dimensional depth image by taking a vertical surface vertical to a rail plane and parallel to a rail direction as a horizontal datum plane of the depth image; according to prior size of the side surface of a rail, adopting a threshold segmentation method and detecting a rail splice region; in the rail splice region, adopting the threshold segmentation method and detecting a fastener region according to prior thickness of therail splice; in the fastener region, calculating height and angle of a moving part of the fastener; and taking the height and angle when the fastener is unloosened as references, performing height androtation angle comparison, and judging whether the fastener is loosened or not. The detection method provided by the invention is easy to use, does not change an existing railway fastener structure and can effectively guarantee railway operation security.

Description

technical field [0001] The invention relates to the field of railway infrastructure detection, in particular to a method for detecting looseness of rail fishplate fasteners. Background technique [0002] The fishplate is an important part for connecting rails and rails, through which two rails can be connected end to end. The specific connection method is: holes are opened at the head of the rail, holes are opened on the surface of the fishplate, the screw passes through the fishplate and the rails, and the fishplate and the two rails are connected and fixed by nuts. During the operation of the train, the rail joints are impacted and squeezed, which easily loosens the fasteners of the fishplate, reduces the connection and fixing effect of the two rails, and affects the safety of the track operation. For this reason, there is an urgent need for a method for dynamic detection of rail fishplate fasteners. Contents of the invention [0003] The object of the present inventio...

Claims

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Application Information

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IPC IPC(8): G06T7/50G06T7/11G06T7/60
CPCG06T7/0004G06T7/11G06T7/60
Inventor 左丽玛
Owner 成都精工华耀科技有限公司
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