Online detecting method and device for hot rolling strip surface fault based on laser line light source

A technology of laser line light source and hot-rolled strip steel, which is applied in the direction of optical testing for defects/defects, etc., to achieve good image quality, good light concentration and monochromaticity, and reduce hardware costs

Inactive Publication Date: 2007-01-24
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0007] Aiming at the problems existing in the current on-line inspection system for surface defects of hot-rolled strip steel using the method of "area array CCD camera + str

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  • Online detecting method and device for hot rolling strip surface fault based on laser line light source

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Embodiment Construction

[0015] exist figure 1 Among them, behind the laminar flow cooling (4) and above the roller table in front of the side guide plate (6), an upper surface detection chamber (7) is built, and an upper surface detection device is installed in the upper surface detection chamber (7), including a linear array CCD camera (9) and laser line light source (10). The installation position of the upper surface detection device should be away from the laminar flow cooling, but it should not affect the maintenance and replacement of the side guide plate. Under the roller table in front of the coiler (5) build the lower surface detection cabin (8), install the lower surface detection device in the lower surface detection cabin (8), including a linear array CCD camera (9) and a laser line light source ( 10), because the lower surface detection device will not affect the replacement of the side guide plate, so its installation position should be as close as possible to the coiler to reduce the ...

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Abstract

Using laser line in high brightness emitted from linear light source of green laser in great power irradiates surface of hot rolling strip steel. Linear array CCD camera collects laser light reflected from surface of strip steel online so as to obtain image on surface of strip steel. Based on different properties of light reflectivity between defect area and no defect area on surface of strip steel, the invention carries out process and analysis for image on surface of strip steel collected by camera, so as to determine whether there are defects on surface of strip steel and sort the defects. The invention does not need of unpacking roller, installing baffle, uses fewer light sources so as to lower cost of hardware, and maintenance cost. Since laser light possesses good condensation performance and monochromaticity, images on surface of strip steel collected by camera are in good quality. Thus, tiny defect can be detected.

Description

technical field [0001] The invention relates to an online detection method for surface defects of hot-rolled strip steel and a detection device for realizing the method. Background technique [0002] Due to the high temperature and high speed of the hot-rolled strip steel production line, it is impossible to conduct online detection of surface defects manually, so it is difficult to obtain timely feedback and comprehensive understanding of the surface defects of the coil. Since the 1980s, foreign countries have begun to study the online detection of hot-rolled strip surface defects. At present, the relatively mature technology comes from the German Parsytec company (Chinese name is German Baishitai Company), the company's hot-rolled The on-line detection system for strip surface defects has been applied in Baosteel 2050 and 1580 production lines and Wuhan Iron and Steel 2250 production line. The surface image of the steel plate is collected by an area array CCD camera. Thi...

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Application Information

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IPC IPC(8): G01N21/95
Inventor 徐科杨朝霖周鹏高阳
Owner UNIV OF SCI & TECH BEIJING
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