CN1900701A - Online detecting method and device for hot rolling strip surface fault based on laser line light source - Google Patents
Online detecting method and device for hot rolling strip surface fault based on laser line light source Download PDFInfo
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- CN1900701A CN1900701A CN 200610088828 CN200610088828A CN1900701A CN 1900701 A CN1900701 A CN 1900701A CN 200610088828 CN200610088828 CN 200610088828 CN 200610088828 A CN200610088828 A CN 200610088828A CN 1900701 A CN1900701 A CN 1900701A
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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
The present invention relates to a kind of online test method of hot-strip surface imperfection, and the pick-up unit of realizing this method.
Background technology
Because temperature height, the speed of hot-rolled strip production line are fast, can't be by manually carrying out the online detection of surface imperfection, therefore the case of surface defects for the roll coil of strip is difficult to be fed back timely and overall understanding.Abroad since the 1980s just to the hot-strip surface imperfection online detection study, the technology of comparative maturity comes from German Parsytec company (Chinese is looked safe company for Germany hundred) at present, the hot-strip surface imperfection on-line detecting system of the said firm has obtained application on Baosteel 2050 and 1580 production lines and Wuhan Iron and Steel Plant 2250 production lines, these systems adopt the scheme of " Array CCD Camera+xenon flashtube ", gather the surface of steel plate image promptly by many xenon flashtube irradiation belt steel surfaces, and by Array CCD Camera.This scheme exists following problem:
(1) Array CCD Camera adopts the mode of frame scan, need on band steel direction of motion (promptly vertical), a bigger collection space be arranged, general requirement according to accuracy of detection, probably more than 200mm, and the spacing of the roller-way of hot-rolled strip production line generally has only 40mm, therefore below roller-way during the lower surface pick-up unit of mounting strap steel, the spacing of roller-way is too little, influences the collection of image.The method that the said firm adopts is the roller of dismantling, and in order to cause band steel toe portion easily to penetrate roller-way greatly because the roller-way spacing becomes behind the roller that prevents to dismantle, thereby causes industrial accident, adds an auxiliary baffle plate in the place of the roller of dismantling.Before band steel toe portion arrived, baffle plate erected, and held band steel toe portion, avoided head to penetrate roller-way; After being with steel toe portion to leave baffle plate, baffle plate falls, and pick-up unit begins workpiece.Therefore cause band steel toe portion not detect.
(2) non-uniform light of xenon flashtube generally needs many xenon flashtubes to shine belt steel surface simultaneously and just can obtain desirable illumination, causes the cost costliness of equipment, and is difficult in maintenance.
Linear array CCD camera is used more extensive in the surface is detected, because linear array CCD camera adopts the mode of line sweep, need be in the big collection space on the band steel direction of motion, therefore, if in the online detection of hot-strip surface imperfection, carry out image acquisition, then can avoid Array CCD Camera need tear problems such as roller, installation baffle plate and head can not detect open with linear array CCD camera.But the frequency acquisition height of linear array CCD camera generally need have only 60 times/second and the glow frequency of xenon flashtube is the highest more than 5000 row/seconds, far below the frequency acquisition of linear array CCD camera.Therefore needing new light source provides illumination for linear array CCD camera, this light source must be high frequency or continuous working, the light source of continuous working at present has LED, fluorescent light, Halogen lamp LED etc., but because the hot-strip surface temperature is very high, the position of light source and the distance of surface of steel plate are far could to guarantee the light source operate as normal, and these light sources do not have the effect of optically focused, and distance is far away more, illumination intensity of light source is just low more, does not reach illuminating effect.
Laser has good optically focused, and general LASER Light Source is a pointolite, in order to be used for the illumination of linear array CCD camera, adds a cylindrical mirror before the laser spots light source, and pointolite is diffused into line source.Since the concentration of energy of this light source, and have good monochromaticity, be applicable to hot-rolled strip production line.
Summary of the invention
The present invention is directed to present hot-strip surface imperfection on-line detecting system and adopt the existing problem of " Array CCD Camera+xenon flashtube " mode, the method and the device of the online detection hot-strip of a kind of employing " linear array CCD camera+laser line light source " mode surface imperfection is provided.
The present invention shines the hot-strip surface with the high brightness laser lines that laser line light source is launched, by linear array CCD camera online acquisition belt steel surface laser light reflected light, by image pick-up card video image acquisition is got off, and carry out A/D and change, become digital picture, digital picture is carried out filtering, processing such as denoising, some undesired signals in the removal of images, whether exist defective again in the detected image, and defective is demarcated, promptly determine the position and the size at defective place, at last, detected defective is discerned automatically, to determine that this defective is the defective of which kind of type, concurrent computational system is passed to database server with the defect information that obtains by gigabit Ethernet, in database server, merge and preserve, can preserve a large amount of defect information historical datas by massage storage, at quality inspection station installing terminal, be connected by gigabit Ethernet between terminal and the database server, by the terminal testing result of display defect in real time.
A kind of hot-strip surface imperfection on-line measuring device of implementing technique scheme, form pick-up unit by described linear array CCD camera and described laser line light source in its feature, pick-up unit is divided into upper and lower surface two cover pick-up units, after the upper surface pick-up unit is installed in the laminar flow cooling, before the flipper guide, before the lower surface pick-up unit is installed in coiling machine.
Further, the present invention adopts all solid state pump laser of peak power output more than 500mW, Wavelength of Laser is 532nm (being green glow), front end at laser instrument adds a cylindrical mirror, cylindrical mirror is according to installation site and the needed laser rays length and the width design of laser instrument, 2 meters of the installation sites of laser instrument apart from the hot-strip surface, available laser rays length is 2 meters, width is 40mm.
Adopt the design of the hot-strip surface imperfection on-line measuring device that technique scheme realizes as follows: the roller-way zone installation surface pick-up unit in the laminar flow cooling back of hot-rolled strip production line before the coiling machine, the upper surface pick-up unit is installed in the roller-way top, and the lower surface pick-up unit is installed in the roller-way below.Pick-up unit comprises many linear array CCD cameras and a laser line light source, video camera is placed on the band steel transversely, the image that adjacent camera collects needs certain overlapping, so that guarantee to scan the image of whole belt steel surface, its overlapping part is eliminated in subsequent image processing, laser instrument adopts all solid state pump laser of peak power output more than 500mW, Wavelength of Laser is 532nm (being green glow), front end at laser instrument adds a cylindrical mirror, cylindrical mirror is according to installation site and the needed laser rays length and the width design of laser instrument, 2 meters of the installation sites of laser instrument apart from the hot-strip surface, available laser rays length is 2 meters, and width is 40mm.Camera acquisition to image send concurrent computational system to, by parallel computing and adopt the rapid image Processing Algorithm that image is carried out real-time analysis and processing.All algorithms comprise that defects detection and classification of defects algorithm all finish in concurrent computational system.The defect information that concurrent computational system obtains (information such as the position of defective, size, type, grade) is passed to database server by gigabit Ethernet, in database server, merge and preserve, can preserve a large amount of defect information historical datas by massage storage.At quality inspection station installing terminal, be connected by gigabit Ethernet between terminal and the database server, by the terminal testing result of display defect in real time.
The invention has the beneficial effects as follows, in whole detection device, only need two laser line light sources, upper and lower surface each with one, and do not need to tear open roller and installation baffle plate, greatly reduce the hardware cost of equipment and installation, maintenance cost.And because LASER Light Source has good optically focused and monochromaticity, the band steel surface image quality that collects is good, and small defective also can detect.
Description of drawings
Be described further originally inventing below in conjunction with drawings and Examples.
Fig. 1 is a pick-up unit scheme of installation of the present invention.1. ground levels among the figure, 2. roller-way, 3. hot-strip, 4. laminar flow cooling, 5. coiling machine, 6. flipper guide, 7. upper surface detects houselet, and 8. lower surface detects houselet, 9. linear array CCD camera, 10. laser line light source.For the ease of expression, upper and lower surface has only been drawn a video camera, generally needs multiple cameras in the practical application among Fig. 1.
Embodiment
In Fig. 1, in laminar flow cooling (4) back, the roller-way top of flipper guide (6) front is built upper surface and is detected houselet (7), installs surface detection apparatus in upper surface detects houselet (7), comprises linear array CCD camera (9) and laser line light source (10).The installation site of upper surface pick-up unit will be cooled off away from laminar flow, but can not influence the maintain and replace of flipper guide.Build lower surface in the roller-way below of coiling machine (5) front and detect houselet (8), the lower surface pick-up unit in detecting houselet (8), is installed lower surface, comprise linear array CCD camera (9) and laser line light source (10), because the lower surface pick-up unit can not influence the replacing of flipper guide, therefore as close as possible coiling machine is wanted in its installation site, to reduce the influence of laminar cooling water.
Camera acquisition to image send concurrent computational system to, by parallel computing and adopt the rapid image Processing Algorithm that image is carried out real-time analysis and processing.Concurrent computational system is realized following function:
(1) image acquisition and digitizing.By image pick-up card video image acquisition is got off, and carry out the A/D conversion, become digital picture, so that carry out subsequent treatment.
(2) image pre-service.Digital picture is carried out processing such as filtering, denoising, some undesired signals in the removal of images.
(3) defects detection.Whether exist defective in the detected image, and defective is demarcated, promptly determine the position and the size at defective place.
(4) classification of defects.Detected defective is discerned automatically, to determine that this defective is the defective of which kind of type.
The defect information that concurrent computational system obtains (information such as the position of defective, size, type, grade) is passed to database server by gigabit Ethernet, and the function that realizes in the database server has:
(1) defective merges.Because system has adopted the mode of a plurality of area array CCD camera synchronous acquisition surface of steel plate images, have some defect distribution adjacent camera collection to image in, merge by defective, these defectives can be merged into a complete defective, so that carry out the classification and the statistics of defective.
(2) defect database.The topmost function of database server is to make up a defect database, in order to preserving and the inquiry defective data, and provides the backup and the restoring function of defective historical data.
(3) assessment roll coil of strip surface quality.According to detected defect information, assess the surface quality situation of the whole roll coil of strip.
At quality inspection station installing terminal, be connected by gigabit Ethernet between terminal and the database server, the function that terminal will realize has:
(1) inquiry has detected coil of strip.The surface imperfection situation of the roll coil of strip that inquiry had detected from defect database.
(2) defective shows.Defect distribution situation on the online demonstration current detection roll coil of strip, and show the details of each defective.
(3) generate also print defect statistical report form.According to the surface imperfection statistical conditions of the roll coil of strip, generate the defect statistics form of the roll coil of strip automatically, and printable.
(4) defective is reported to the police.Report to the police for periodicity defect or some major defects.
Claims (2)
1, a kind of hot-strip surface imperfection online test method based on laser line light source, it is characterized in that the high brightness laser lines of laser line light source emission are shone the hot-strip surface, by linear array CCD camera online acquisition belt steel surface laser light reflected light, image pick-up card gets off video image acquisition, and carry out A/D and change, become digital picture, digital picture is carried out filtering, processing such as denoising, some undesired signals in the removal of images, whether exist defective again in the detected image, and defective is demarcated, promptly determine the position and the size at defective place, at last, detected defective is discerned automatically, to determine that this defective is the defective of which kind of type, again the defect information that obtains is passed to database server by gigabit Ethernet, in database server, merge and preserve, can preserve a large amount of defect information historical datas by massage storage, at quality inspection station installing terminal, be connected by gigabit Ethernet between terminal and the database server, by the terminal testing result of display defect in real time.
2, a kind of device of implementing claim 1, it is characterized in that forming pick-up unit by described linear array CCD camera and described laser line light source, described pick-up unit is divided into upper and lower surface two cover pick-up units, after the upper surface pick-up unit is installed in the laminar flow cooling, before the flipper guide, before the lower surface pick-up unit is installed in coiling machine.
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| CN 200610088828 CN1900701A (en) | 2006-07-19 | 2006-07-19 | Online detecting method and device for hot rolling strip surface fault based on laser line light source |
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| CN 200610088828 CN1900701A (en) | 2006-07-19 | 2006-07-19 | Online detecting method and device for hot rolling strip surface fault based on laser line light source |
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Cited By (29)
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| CN101949865A (en) * | 2010-09-19 | 2011-01-19 | 首钢总公司 | Method for optimizing Parsytec on-line surface defect detection system |
| CN101450352B (en) * | 2007-12-04 | 2011-06-15 | 上海宝钢工业检测公司 | Tandem-mill strip-steel vibration marks detection method |
| CN102162795A (en) * | 2010-02-23 | 2011-08-24 | 宝山钢铁股份有限公司 | Method for comprehensive on-line detection of defects of band steel |
| CN102253049A (en) * | 2011-06-30 | 2011-11-23 | 东北大学 | Method for accurately detecting surface quality on line in production process of band steel |
| CN101294945B (en) * | 2007-04-28 | 2012-03-28 | 宝山钢铁股份有限公司 | White edge detecting method for hot galvanizing alloying plate |
| CN102636492A (en) * | 2012-04-18 | 2012-08-15 | 湖南大学 | High-speed visual on-line detection equipment for surface defects of steel rails |
| CN102645219A (en) * | 2012-05-16 | 2012-08-22 | 航天科工哈尔滨风华有限公司 | Visual navigation system of wall climbing robot for weld inspection, welding and locating method of welding seam and method of obtaining welding seam offset |
| CN103163141A (en) * | 2011-12-14 | 2013-06-19 | 鞍钢股份有限公司 | Strip steel surface online detection system and method based on embedded image processing system |
| CN103543161A (en) * | 2013-10-16 | 2014-01-29 | 湖南镭目科技有限公司 | On-line detection method of continuous casting billet surface quality |
| WO2014040486A1 (en) * | 2012-09-14 | 2014-03-20 | Luoyang Landglass Technology Co., Ltd. | Detection system based on modulation of line structured laser image of glass |
| CN104021540A (en) * | 2013-02-28 | 2014-09-03 | 宝山钢铁股份有限公司 | Static state calibration device and method for machine visual surface detection equipment |
| CN104101603A (en) * | 2013-04-12 | 2014-10-15 | 宝山钢铁股份有限公司 | Device and method for detecting surface defect on strip steel |
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| CN104515776A (en) * | 2013-09-26 | 2015-04-15 | 宝钢新日铁汽车板有限公司 | Device and method for determining positions of strip steel surface defect |
| CN104985002A (en) * | 2015-05-27 | 2015-10-21 | 北京首钢股份有限公司 | Hot rolled strip steel edge defect alarm method and apparatus |
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| CN102162795A (en) * | 2010-02-23 | 2011-08-24 | 宝山钢铁股份有限公司 | Method for comprehensive on-line detection of defects of band steel |
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