CN102519983B - Method for detecting pressing mark of photovoltaic aluminum section on line - Google Patents
Method for detecting pressing mark of photovoltaic aluminum section on line Download PDFInfo
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- CN102519983B CN102519983B CN 201110444225 CN201110444225A CN102519983B CN 102519983 B CN102519983 B CN 102519983B CN 201110444225 CN201110444225 CN 201110444225 CN 201110444225 A CN201110444225 A CN 201110444225A CN 102519983 B CN102519983 B CN 102519983B
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- optoelectronic switch
- impression
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- section bar
- aluminium section
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Abstract
The invention provides a method for detecting the pressing mark of a photovoltaic aluminum section on line. The method comprises the following steps of: arranging a start photoelectric switch, a stop photoelectric switch and a camera on a conveying belt of the aluminum section; and when the aluminum section quickly passes through a monitoring area, sequentially triggering the start photoelectric switch, the stop photoelectric switch and the camera, processing image information acquired by the camera by using an industrial personal computer, and identifying whether the pressing mark exists on a workpiece or not and is qualified or not, so that the aim of detecting whether the aluminum section is qualified or not is fulfilled. The image information acquired by the camera for detecting the pressing mark is processed by the industrial personal computer, so that the pressing mark of the aluminum section under the quick movement condition is effectively detected, and the invention has the characteristics of simple and compact detection device and simple and reliable detection method.
Description
Technical field
The present invention relates to the online measuring technique field, relate in particular to and utilize reflective photoelectric switch and video camera to whether existing standard compliant impression to carry out the method automatically detected on the aluminium section bar workpiece that is applied to photovoltaic generating system.
Background technology
Aluminium section bar is a large amount of structural members that adopt in photovoltaic generating system, and along with the development of photovoltaic system, the requirement of photovoltaic aluminium section bar is increasing.The surface of aluminium section bar need to process standard compliant impression, at the scene, workshop of photovoltaic generating system, need to detect online whether having formed qualified impression on aluminium section bar.Most domestic photovoltaic generation enterprise still adopts manual observation to the detection of aluminium section bar at present, establishes some workmans on aluminium section bar travelling belt side and is estimated and process, and according to whether impression is qualified, the aluminium section bar workpiece is divided into to certified products and unacceptable product.
The shortcoming that manual detection exists mainly contains: the on-the-spot dust in workshop is many, noise is large, and workman's testing environment is severe; The discomforts such as the long-time uninterrupted observation moving object of normal eye is known from experience the generation dim eyesight, eye is swollen, undetected, false retrieval phenomenon, easily occur in testing staff's non-stop run for a long time; For the detection of high dimensional accuracy, human eye is difficult to accurately judgement, and error is large, can't guarantee to detect quality; The speed of artificial observation is limited, and production efficiency is had to very big restriction.
Therefore, according to the requirement of different length aluminium section bar, the on-line detecting system of research based on the Electromechanical Control technology, the detection method of research to impression, realize the quick online detection of aluminium section bar, for the automated production of aluminum fabrication industry provides technology, with equipment, support and be very important.
Summary of the invention
The object of the present invention is to provide a kind of pressing mark of photovoltaic aluminum section online test method, improve efficiency and accuracy that aluminium section bar detects, capture undetected, false retrieval phenomenon difficult point that manual observation causes, realize the full-automatic aluminium section bar of producing, from the detection that is worked into of aluminium section bar, rely on machine to complete fully, support for the safe and reliable production of aluminium section bar provides technology and equipment.
Technical scheme of the present invention is as follows:
A kind of pressing mark of photovoltaic aluminum section online test method, is characterized in that comprising the steps:
1) build detection system:
Initial optoelectronic switch is installed on the aluminium section bar travelling belt, is finished optoelectronic switch and video camera, described initial optoelectronic switch, end optoelectronic switch are connected with video camera respectively, and described initial optoelectronic switch, end optoelectronic switch are connected with industrial computer with video camera;
2) the aluminium section bar workpiece passes through the surveyed area on the aluminium section bar travelling belt fast, successively triggers described initial optoelectronic switch, video camera, end optoelectronic switch, video camera, gathers the indentation image at aluminium section bar workpiece two ends;
2.1) image acquisition for the first time of initial optoelectronic switch and video camera:
When the aluminium section bar workpiece enters surveyed area, trigger initial optoelectronic switch, initial optoelectronic switch becomes high level from low level; The image that now camera acquisition one width comprises impression;
2.2) finish the image acquisition for the second time of optoelectronic switch and video camera:
When the aluminium section bar workpiece is about to leave surveyed area, trigger and finish optoelectronic switch, finish optoelectronic switch and become low level from high level; The image that now camera acquisition one width comprises impression;
3) video camera by image acquisition, in the internal memory of industrial computer, identified the impression in image by industrial computer, and the impression recognition result of comprehensive front and back two width images, determine that whether workpiece is qualified, and concrete steps are as follows:
When video camera photographs image, at first by transfer algorithm, be converted into gray-scale map, and carry out filtering and picture smooth treatment; Afterwards, pixels all on image is carried out to binary conversion treatment, disposal route is: according to the workpiece situation, select this point a certain neighborhood on every side, the gray-scale value of points all in this neighborhood is carried out to direct mean value calculation or by calculating mean value after the Gaussian distribution weighting, if mean value is greater than this gray-scale value, this point is judged to be black, otherwise is judged to be white, simultaneously by the image inverse; According to surface of the work situation again carry out the morphological dilations or contraction of one or many image after, find white connected region thereafter; White connected region is judged, if meet the indentation image rule, is determined with impression, be not judged to be without impression if meet, and by impression sign on image; Finally this impression sign is placed in to relevant position demonstration on original image; If the two width images that video camera gathers all have been judged as impression after above-mentioned steps, determine that workpiece is certified products.
Described initial optoelectronic switch and to finish the installation site of optoelectronic switch as follows: when the aluminium section bar workpiece during in surveyed area, described initial optoelectronic switch and finish optoelectronic switch and be positioned at the lower face that the aluminium section bar workpiece has impression, have the Surface Vertical of impression with the aluminium section bar workpiece.
The installation site of described video camera is as follows: when the aluminium section bar workpiece, during in surveyed area, there is the surface of impression position for video camera in the aluminium section bar workpiece, with the aluminium section bar workpiece, the Surface Vertical of impression is arranged.
The relative position of described beginning optoelectronic switch and end optoelectronic switch and video camera is as follows: the horizontal range of described initial optoelectronic switch and video camera equals the distance of right side impression to edge, aluminium section bar workpiece the right, and the horizontal range of described end optoelectronic switch and video camera equals the distance of left side impression to aluminium section bar workpiece left margin.
Useful technique effect of the present invention is:
One, the present invention is fixed in pick-up unit on the aluminium section bar travelling belt, and optoelectronic switch and camera are fixed on pick-up unit, realize contactless detection; Fast through monitored area, successively trigger initial optoelectronic switch, video camera, end optoelectronic switch, video camera when aluminium section bar, then pass through the processing to image acquisition information by industrial computer, and then judge that whether aluminium section bar is qualified.Mounting means is simple, and detection method is reliable, compared with current other existing detection mode, more reliable, convenient.
Two, the original image that video camera of the present invention is taken, after involving after filtration the binaryzation conversion, can be identified the domain of the existence of impression, because the impression location is relatively fixing on image, can be only to occurring in image that indentation unit is analyzed with raising speed and reduces error, the good Indentation position of mark and analyzed area on image after identification, more intuitively be placed in mark on original image and show for making image.
Three, the designed optoelectronic switch of the present invention, select infrared LED as infrarede emitting diode, and photoelectricity receives triode as infrared receiving tube, and shock resistance and anti-seismic performance are good, and reliability is high, and the life-span is long.Consider that aluminium section bar detects the relation of time space position, selects reflective receive mode.Video camera is selected high-speed camera, can guarantee that image definition is in tolerance interval.
The accompanying drawing explanation
Fig. 1 is initial optoelectronic switch, the installation site figure that finishes optoelectronic switch, video camera.
Fig. 2-1st, the impression gray level image.
Fig. 2-2nd, do by Fig. 2-1 image that binaryzation converts rear inverse.
The image of impression sign is done in Fig. 2-3rd on Fig. 2-2.
Fig. 2-4th, transfer to the image on Fig. 2-1 by the impression sign on Fig. 2-3.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.
At first, build impression on-line detecting system as shown in Figure 1.Initial optoelectronic switch 1 is installed on the pick-up unit of aluminium section bar travelling belt, is finished optoelectronic switch 2 and video camera 3.Beginning optoelectronic switch 1, end optoelectronic switch 2 are connected with video camera 3 respectively.And the electric-control system that is core with the industrial computer of detection signal being processed to judgement by initial optoelectronic switch 1, end optoelectronic switch 2 and video camera 3 is connected (industrial computer is not shown in Fig. 1).Initial optoelectronic switch 1, can detect the arrival of workpiece, takes order to video camera 3 simultaneously; Finish optoelectronic switch 2, can detect the end of workpiece, take order to video camera 3 simultaneously; Video camera 3, can detect the situation of impression.
As shown in Figure 1, initial optoelectronic switch 1, the installation site of finishing optoelectronic switch 2 and video camera 3 are respectively: when aluminium section bar workpiece 4 during in surveyed area, the initial optoelectronic switch 1 judged for reference position and the end optoelectronic switch 2 judged for end position are installed on the lower face that impression is arranged of aluminium section bar workpiece 4, and the Surface Vertical that impression is arranged with aluminium section bar workpiece 4, and, apart from the surface that impression is arranged one segment distance of aluminium section bar workpiece 4, this distance can be adjusted according to the designing requirement of optoelectronic switch.
Next, adjust the relative position of initial optoelectronic switch 1, end optoelectronic switch 2 and video camera 3, while having made signal intensity, video camera 3 can collect indentation image just.Specifically, the initial optoelectronic switch in Fig. 11 equals the distance of impression 5 to aluminium section bar workpiece 4 edges, the right with the horizontal range of video camera 3, and finish optoelectronic switch 2, with the horizontal range of video camera 3, equals the distance of impression 6 to aluminium section bar workpiece 4 left margins.The position of initial optoelectronic switch 1 and end photoswitc 2 is with respect to video camera 3 position symmetries.
When above-mentioned initial optoelectronic switch 1, finish that optoelectronic switch 2 and video camera 3 install according to the position of Fig. 1 and in running order, can the aluminium section bar workpiece 4 of each process be detected.Specifically, the detecting step of a workpiece is: when aluminium section bar workpiece 4 enters surveyed area, first trigger initial optoelectronic switch 1, initial optoelectronic switch 1 becomes high level from low level; Now video camera 3 is positioned at directly over impression 5, gathers the image that a width comprises impression 5; When aluminium section bar workpiece 4 is about to leave surveyed area, trigger and finish optoelectronic switch 2, finish optoelectronic switch 2 and become low level from high level, now video camera 3 is positioned at directly over impression 6, gathers the image that a width comprises impression 6; Last aluminium section bar workpiece 4 leaves initialize switch, makes initial optoelectronic switch 1 become low level from high level, and so far a workpiece sensing is complete.
As shown in Fig. 2-1 ~ 2-4, by black and white or colour TV camera 3 by image acquisition to after in the internal memory of industrial computer, in industrial computer, adopt machine vision technique to be identified impression in image, the judged result of comprehensive front and back two width indentation images determines that whether workpiece is qualified.Specifically comprise four steps:
When video camera photographs image, at first by transfer algorithm, be converted into gray-scale map, and carry out filtering and picture smooth treatment, now the gray-scale value at impression place obviously reduces (seeing Fig. 2-1).Identify impression by gray-scale value mean value afterwards, pixels all on image is carried out to binary conversion treatment, disposal route is: according to the workpiece situation, select this point a certain neighborhood on every side, the gray-scale value of points all in this neighborhood is carried out to direct mean value calculation or by calculating mean value after the Gaussian distribution weighting, if mean value is greater than this gray-scale value, this point is judged to be black, otherwise is judged to be white, simultaneously by image inverse (seeing Fig. 2-2).According to surface of the work situation again carry out the morphological dilations or contraction of one or many image after, find white connected region thereafter.White connected region is judged, if meet the indentation image rule, be determined with impression, be not judged to be without impression if meet, and impression sign (is shown in to Fig. 2-3) on image.Finally, for making image more directly perceived, this impression sign is placed in to relevant position demonstration (seeing Fig. 2-4) on original image.If the two width images that video camera gathers all have been judged as impression after above-mentioned steps, determine that workpiece is certified products.
Above-described is only the preferred embodiment of the present invention, the invention is not restricted to above embodiment.Be appreciated that other improvement and variation that those skilled in the art directly derive without departing from the basic idea of the present invention or associate, within all should thinking and being included in protection scope of the present invention.
Claims (4)
1. a pressing mark of photovoltaic aluminum section online test method, is characterized in that comprising the steps:
1) build detection system:
Initial optoelectronic switch is installed on the aluminium section bar travelling belt, is finished optoelectronic switch and video camera, described initial optoelectronic switch, end optoelectronic switch are connected with video camera respectively, and described initial optoelectronic switch, end optoelectronic switch are connected with industrial computer with video camera;
2) the aluminium section bar workpiece passes through the surveyed area on the aluminium section bar travelling belt fast, successively triggers described initial optoelectronic switch, video camera, end optoelectronic switch, video camera, gathers the indentation image at aluminium section bar workpiece two ends;
2.1) image acquisition for the first time of initial optoelectronic switch and video camera:
When the aluminium section bar workpiece enters surveyed area, trigger initial optoelectronic switch, initial optoelectronic switch becomes high level from low level; The image that now camera acquisition one width comprises impression;
2.2) finish the image acquisition for the second time of optoelectronic switch and video camera:
When the aluminium section bar workpiece is about to leave surveyed area, trigger and finish optoelectronic switch, finish optoelectronic switch and become low level from high level; The image that now camera acquisition one width comprises impression;
3) video camera by image acquisition, in the internal memory of industrial computer, identified the impression in image by industrial computer, and the impression recognition result of comprehensive front and back two width images, determine that whether workpiece is qualified, and concrete steps are as follows:
When video camera photographs image, at first by transfer algorithm, be converted into gray-scale map, and carry out filtering and picture smooth treatment; Afterwards, pixels all on image is carried out to binary conversion treatment, disposal route is: according to the workpiece situation, select this point a certain neighborhood on every side, the gray-scale value of points all in this neighborhood is carried out to direct mean value calculation or by calculating mean value after the Gaussian distribution weighting, if mean value is greater than this gray-scale value, this point is judged to be black, otherwise is judged to be white, simultaneously by the image inverse; According to surface of the work situation again carry out the morphological dilations or contraction of one or many image after, find white connected region thereafter; White connected region is judged, if meet the indentation image rule, is determined with impression, be not judged to be without impression if meet, and by impression sign on image; Finally this impression sign is placed in to relevant position demonstration on original image; If the two width images that video camera gathers all have been judged as impression after above-mentioned steps, determine that workpiece is certified products.
2. pressing mark of photovoltaic aluminum section online test method according to claim 1, it is characterized in that: described initial optoelectronic switch and to finish the installation site of optoelectronic switch as follows: when the aluminium section bar workpiece during in surveyed area, described initial optoelectronic switch and finish optoelectronic switch and be positioned at the lower face that the aluminium section bar workpiece has impression, have the Surface Vertical of impression with the aluminium section bar workpiece.
3. pressing mark of photovoltaic aluminum section online test method according to claim 1, it is characterized in that: the installation site of described video camera is as follows: when the aluminium section bar workpiece during in surveyed area, there is the surface of impression position for video camera in the aluminium section bar workpiece, with the aluminium section bar workpiece, the Surface Vertical of impression is arranged.
4. pressing mark of photovoltaic aluminum section online test method according to claim 1, it is characterized in that: the relative position of described beginning optoelectronic switch and end optoelectronic switch and video camera is as follows: the horizontal range of described initial optoelectronic switch and video camera equals the distance of right side impression to edge, aluminium section bar workpiece the right, and the horizontal range of described end optoelectronic switch and video camera equals the distance of left side impression to aluminium section bar workpiece left margin.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110444225 CN102519983B (en) | 2011-12-27 | 2011-12-27 | Method for detecting pressing mark of photovoltaic aluminum section on line |
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| CN 201110444225 CN102519983B (en) | 2011-12-27 | 2011-12-27 | Method for detecting pressing mark of photovoltaic aluminum section on line |
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| CN103335948B (en) * | 2013-05-31 | 2016-05-11 | 合肥众沃仪器技术有限公司 | Intensity of press marks on cigarette paper measurement mechanism and method |
| CN108169241B (en) * | 2018-01-04 | 2020-12-15 | 宁波伊士通技术股份有限公司 | Image acquisition method for product of production line |
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| US4247306A (en) * | 1979-01-17 | 1981-01-27 | Elkem Spigerverket A/S | Detection of flaws in metal members |
| US6085414A (en) * | 1996-08-15 | 2000-07-11 | Packard Hughes Interconnect Company | Method of making a flexible circuit with raised features protruding from two surfaces and products therefrom |
| JP2000230926A (en) * | 1999-02-10 | 2000-08-22 | Kawasaki Steel Corp | Method and apparatus for inspecting defect |
| CN101105459A (en) * | 2007-05-15 | 2008-01-16 | 广州市万世德包装机械有限公司 | Empty bottle mouth defect inspection method and device |
| WO2010006895A1 (en) * | 2008-07-16 | 2010-01-21 | Siemens Aktiengesellschaft | Operating method for a processing device processing a metal strip and system for processing a metal strip |
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