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Steel wire rope detection device based on three-dimensional image, surface damage detection method and rope diameter calculation method

A detection device and three-dimensional image technology are applied in the field of wire rope detection, which can solve the problems of difficulty in realization, inability to guarantee the detection rate of wire rope surface damage, low manual inspection efficiency, etc., and achieve the effect of simple structure

Inactive Publication Date: 2020-09-29
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Affected by factors such as personnel quality, working environment, and harsh working conditions, manual inspection cannot guarantee the detection rate of wire rope surface damage
The machine vision detection method is mainly to use the camera to take pictures and transmit the pictures to the remote server. The machine vision algorithm analyzes the surface damage of the steel wire rope on the picture and gives the damage information. This method can only see one side of the steel wire rope but not the back of the steel wire rope at the same time. , to see the back of the wire rope requires at least two cameras
[0005] The diameter measurement of the steel wire rope is carried out manually using a caliper. The wire rope needs to stop working during the measurement. Generally, partial measurement is performed. If the overall measurement takes too long, and the measured value needs to be manually recorded
In addition, using a circuit system composed of a charge-coupled device (CCD) to measure the diameter of the steel wire rope is expensive and difficult to implement.
In short, the existing manual inspection is inefficient and wastes a lot of production time, and the accuracy of surface damage detection cannot be guaranteed
Other detection methods cannot intuitively reflect the surface damage of the wire rope

Method used

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  • Steel wire rope detection device based on three-dimensional image, surface damage detection method and rope diameter calculation method
  • Steel wire rope detection device based on three-dimensional image, surface damage detection method and rope diameter calculation method
  • Steel wire rope detection device based on three-dimensional image, surface damage detection method and rope diameter calculation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 As shown, the real-time online detection device for the steel wire rope is sleeved on the steel wire rope, and includes a camera, two mirrors, a white bottom plate, two light sources and a communication unit; Above; the two mirrors are symmetrically arranged on the left and right sides of the steel wire rope, and each mirror is gradually inclined from top to bottom to a position close to the center point of the white base plate, and the extension angle of the two mirrors is 120°; The two light sources are respectively arranged on the left and right sides of the steel wire rope, and are all arranged below the steel wire rope and above the camera; the white bottom plate, the mirror and the camera are all relatively parallel to the steel wire rope; the white bottom plate The center points of , mirror, camera and light source are all located on the same horizontal plane.

[0033] Described camera adopts black-and-white CCD camera; Described camera is 300 m...

Embodiment 2

[0035] The above-mentioned detection device can be used to detect the surface damage of the steel wire rope. The detection process is as follows: figure 2 As shown, the specific steps include:

[0036] 1. Wire rope 3D imaging algorithm:

[0037]After image segmentation, image transformation, image enhancement, and image splicing are performed on the front, left rear, and right rear images of the steel wire rope obtained from the camera, the unfolded image of the surface of the steel wire rope can be obtained. The surface normal vector of the steel wire rope is calculated by the light and shade changes of each point on the microscopic image of the steel wire rope, that is, the reflected light intensity, so as to calculate the height value of each point and restore the three-dimensional shape of the surface. The light intensity reflected by a point on the surface of an object is proportional to the cosine of the incident angle of the point, that is

[0038] E(x,y)=I(x,y)ρcosθ...

Embodiment 3

[0062] The rope diameter calculation method of the steel wire rope, the camera shoots the shadow area left by the steel wire rope on the white base plate, obtains a frontal image, processes the frontal image to obtain the width of the steel wire rope image, and then calculates the wire rope according to the distance between the camera, the steel wire rope and the white base plate. real-time rope diameter. Specifically:

[0063] For the front image of the steel wire rope, the grayscale image is converted, and the converted image is Gaussian filtered. Canny edge detection is performed on the image after Gaussian filtering, using the edge(I, method, threshold) function, where I is the input image, method is the specified algorithm, the algorithm uses "canny" for edge detection, and threshold is the threshold, usually set to 0.1 . Then use the morphological algorithm to remove smaller objects to obtain the image edge feature image, and the width of the wire rope image on the whi...

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Abstract

The invention relates to a steel wire rope detection device based on a three-dimensional image, a surface damage detection method and a rope diameter calculation method, and belongs to the technical field of steel wire rope detection. The steel wire rope detection device sleeves a steel wire rope and comprises a camera, two mirrors, a white bottom plate, two light sources and a communication unit;the white bottom plate is arranged over the steel wire rope, and the camera is arranged under the steel wire rope; the two mirrors are arranged in the left side and the right side of the steel wire rope respectively, each mirror inclines gradually in the direction close to the center point of the white bottom plate from top to bottom, and the extending included angle of the two mirrors is 120 degrees. The two light sources are arranged in the left side and the right side of the steel wire rope respectively and arranged below the steel wire rope and above the camera. The white bottom plate, the mirrors and the camera are all parallel to the steel wire rope; and the central points of the white bottom plate, the mirrors and the camera are positioned in the same plane. The detection device isused for automatically detecting surface damage and giving an alarm, and can continuously and automatically calculate the diameter of the steel wire rope in real time.

Description

technical field [0001] The invention belongs to the technical field of steel wire rope detection, and in particular relates to a three-dimensional image-based steel wire rope detection device, surface damage detection and rope diameter calculation method. Background technique [0002] The steel wire rope is made of many small carbon steel wires twisted into small strands, and then several of these strands are interlaced around the rope core to form ropes with different diameters. As a traction device, wire rope is widely used in various fields of the national economy such as elevators, high-altitude cableways, hoisting, transportation, ship traction, mine hoisting, and bridges. As an important component, steel wire rope often has surface damage such as broken wire, corrosion, and wear during use, which can easily cause safety production accidents, property losses, casualties, and adverse social impacts. [0003] When the wire rope carries different loads, the diameter of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/08
CPCG01B11/08
Inventor 马建伟李兴海臧绍飞吕进锋李晓静侯向关汪钰珠王郁茜
Owner HENAN UNIV OF SCI & TECH