CN101905304A - System and method for on-line detection of roundness of continuous casting round billet and image acquiring device - Google Patents
System and method for on-line detection of roundness of continuous casting round billet and image acquiring device Download PDFInfo
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- CN101905304A CN101905304A CN 201010269199 CN201010269199A CN101905304A CN 101905304 A CN101905304 A CN 101905304A CN 201010269199 CN201010269199 CN 201010269199 CN 201010269199 A CN201010269199 A CN 201010269199A CN 101905304 A CN101905304 A CN 101905304A
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Abstract
The invention discloses a system and a method for on-line detection of roundness of a continuous casting round billet. The on-line detection system comprises an image acquiring unit and a controlling unit, wherein the image acquiring unit is arranged right ahead of the end surface of the round billet on a cooling bed and comprises a high-temperature protecting shell and an industry CCD camera which is provided with a telecentric lens and is arranged in the high-temperature protecting shell; and the controlling unit is in signal connection with the industry CCD camera, and is used for processing an image acquired by the end surface of the round billet of the industry CCD camera so as to acquire the roundness of the round billet. The on-line detection system and method of the roundness of the continuous casting round billet have the function of continually acquiring the images of the end surface of the round billet from the continuous casting production site, compared with detection manual in a steelmaking manufacturing plant of the prior method, the invention has the advantages of continual detection, can remind operators on site to adjust a production process so as to prevent the unqualified product from entering the production filed. By using the detection system of the invention, the detection accuracy can be 0.01mm.
Description
Technical field
The present invention relates to the continuous casting of molten steel field, the image collecting device that relates in particular to a kind of on-line detecting system and online test method of roundness of continuous casting round billet and be used for online acquisition continuous cast round billets end view drawing picture.
Background technology
At present, steel mill to the measurement of steel billet end face circularity generally be at steel billet after the flame cutting, be transported on the cold bed through carrying the steel machine, this moment, steel billet temperature was about 600-800 ℃, and the operative employee in the case, use clamp and steel ruler, diameter to steel billet is measured, owing to be subjected to the influence of factors such as the outer slag crust of steel billet, oxide skin, dross, measure error is big, the GRR of measurer is very poor simultaneously, does not possess the ability of line Quality Control basically.In addition, during manual measurement, survey crew will bear the high-temperature baking of steel billet, work under bad environment.
Based on above all multifactor, steel mill is when working control circle base circularity quality, and measure error is big on the one hand, can not reproduce actual conditions exactly, causes a dispute on quality judging; Severe operational environment does not objectively possess and in time detects to avoid causing the material conditions of waste product in batches on the other hand.
Summary of the invention
The object of the invention is to provide a kind of on-line detecting system of roundness of continuous casting round billet, detects the round base circularity on the cold bed is carried out automatic on-line.Another object of the present invention is to provide a kind of online test method of roundness of continuous casting round billet.The present invention also aims to provide a kind of image collecting device that is used for online acquisition continuous cast round billets end view drawing picture.
For this reason, according to an aspect of the present invention, a kind of on-line detecting system of roundness of continuous casting round billet is provided, it comprises: image acquisition units, be arranged on the dead ahead of the end face of the round base on the cold bed, comprise high temperature protection housing and the industrial CCD camera that is arranged in the high temperature protection housing with telecentric mirror head; And control module, being connected with the industrial CCD camera signal, the image that is used for round base end face that the industrial CCD camera is gathered is handled to obtain circle base circularity.
Further, above-mentioned industrial CCD camera is connected with the control module signal by fibre optic transmission equipment.
Further, above-mentioned on-line detecting system also comprises the lighting unit that illumination is provided to the continuous cast round billets end face.
Further, above-mentioned high temperature protection housing has the compressed air inlet and the Compressed Gas outlet of communication with cavity, and this Compressed Gas exports the edge of the outer surface of the transmission lens that is positioned at high temperature protection housing front portion.
Further, above-mentioned high temperature protection housing has support, and support has left and right sides position adjusting mechanism, height adjustment mechanism and luffing angle governor motion.
Further, above-mentioned high temperature protection housing is tubular.Further, the cooling water channel that has annular on the barrel of above-mentioned high temperature protection housing.
Further, above-mentioned control module is used for that the image that the industrial CCD camera is gathered is carried out threshold value and cuts apart, utilize object being measured inside and the ripple of the making an uproar outside in the image after morphologic denoising method is cut apart threshold value to carry out filtering, image after the ripple filtering of making an uproar is carried out the interference of row, column scanning with elimination slag district, and calculate the center of circle and calculate circularity based on the center of circle with least square method.
According to a further aspect in the invention, provide a kind of online test method of roundness of continuous casting round billet, it may further comprise the steps: the end view drawing picture that obtains circle base on the cold bed with the industrial CCD camera with telecentric mirror head that the high temperature protection housing is provided; The end face image is carried out threshold value to be cut apart; Utilize object being measured inside and the ripple of the making an uproar outside in the image after morphologic denoising method is cut apart threshold value to carry out filtering; Image after the ripple filtering of making an uproar is carried out row, column scanning to eliminate the interference in slag district; And utilize the least square method calculating center of circle and calculate circularity in view of the above.
Further, above-mentioned online test method also comprises the step that illumination is provided to circle base end face.
The present invention also provides a kind of image collecting device that is used for online acquisition continuous cast round billets end view drawing picture, comprise: the high temperature protection housing, have the compressed air inlet and the Compressed Gas outlet of communication with cavity, Compressed Gas exports the edge of the outer surface of the transmission lens that is positioned at high temperature protection housing front portion; And the industrial CCD camera that is arranged in the high temperature protection housing with telecentric mirror head.
Further, above-mentioned high temperature protection housing is tubular, has the cooling water channel of annular on the barrel of this high temperature protection housing.
The on-line detecting system of roundness of continuous casting round billet of the present invention, have from the function of continuous casting production scene continuous acquisition circle base end view drawing picture, STEELMAKING PRODUCTION factory adopted the method for manual detection to compare more in the past, advantage with continuous detecting, in time defective work information is sent to master-control room, remind the site operation personnel that production technology is adjusted, prevented that defective work from flowing out the production scene.The accuracy of detection of native system is far above the precision that manual detection reached, and the accuracy of detection of on-line detecting system of the present invention reaches 0.01mm.
Except purpose described above, feature and advantage, other purpose, feature and advantage that the present invention has will be described in further detail in conjunction with the accompanying drawings.
Description of drawings
Constitute this specification a part, be used for further understanding accompanying drawing of the present invention and show the preferred embodiments of the present invention, and be used for illustrating principle of the present invention with specification.Among the figure:
Fig. 1 shows the schematic diagram according to the on-line detecting system of roundness of continuous casting round billet of the present invention;
Fig. 2 shows the schematic layout pattern that is arranged on the scene of detection according to the image acquisition units of on-line detecting system of the present invention;
Fig. 3 is that the A of layout shown in Figure 2 is to view;
Fig. 4 shows the flow chart according to the online test method of roundness of continuous casting round billet of the present invention;
Fig. 5 shows the image of the round base end face of gathering according to industrial CCD camera of the present invention;
Fig. 6 shows image shown in Figure 5 is carried out image after threshold value is cut apart;
Fig. 7 shows make an uproar image after the ripple filtering of image shown in Figure 6;
Fig. 8 shows image procession scanning shown in Figure 7 to eliminate the image after the slag district disturbs;
Fig. 9 shows the perspective view of image acquisition units according to the preferred embodiment of the invention;
Figure 10 shows the structural representation of image acquisition units shown in Figure 9;
Figure 11 shows the local I enlarged diagram of image acquisition units shown in Figure 10; And
Figure 12 shows the side view of image acquisition units shown in Figure 9.
The specific embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
Fig. 1 shows the schematic diagram according to the on-line detecting system of roundness of continuous casting round billet of the present invention.As shown in Figure 1, the on-line detecting system fiber transmission device and the industrial computer 5 that comprise image acquisition units (being image collecting device) 1, lighting unit 2, form by a pair of fiber optic 3,4 and optical fiber.
This image acquisition units 1 is arranged on the dead ahead of the end face of the round base on the cold bed; the industrial CCD camera that it comprises the high temperature protection housing and is arranged in the high temperature protection housing with telecentric mirror head; this industrial CCD camera is used for the end face of the round base 6 on the cold bed is taken pictures; lighting unit 2 is used for providing to circle base end face the illumination of appropriateness; the image that forms in the industrial CCD camera is delivered in the master-control room (not shown) through fiber transmission device, is handled to obtain circle base circularity by 5 pairs of images of industrial computer.
The present invention adopts the industrial CCD camera with telecentric mirror head, its advantage is when in circle base position certain variation being arranged, the image that the camera photographic plate presents does not change thereupon, can obtain distinct image when promptly the position changes before and after the circle base is on cold bed yet.When carrying out the circularity analysis after so having guaranteed, the uniformity of conversion yardstick.
The industrial CCD camera that the present invention will have the telecentric mirror head is positioned in the high temperature protection housing, can guarantee that so camera still can operate as normal under the high temperature of 600-800 degree at the scene.
Lighting unit of the present invention preferably adopts the scatter-type floodlight source of high illumination, all can obtain uniform illumination to guarantee each point of billet surface, has guaranteed that simultaneously billet surface has enough illumination, so that collect the image of low interference, high-resolution.
The present invention adopts fiber transmission device as data transfer means, and transmission range can be brought up to 500 meters, and data can not go out active in this scope, to guarantee the stability of data in the transmission of adverse circumstances medium and long distance.
Fig. 2 and Fig. 3 show the schematic layout pattern that is arranged on the scene of detection according to the industrial CCD camera of on-line detecting system of the present invention.Circle base 6 is via after carrying steel machine (not shown) and being placed into cold bed 7, the industrial CCD industrial camera is positioned at the opposite side of partition wall 8, keep 2 meters distance with circle base end face, after carrying the steel machine and putting down round base 6, can produce an enable signal in the casting machine PCL controller, after industrial computer 5 in this on-line detecting system obtains this information in real time by EPA, send enable signal to the industrial CCD camera, phase machine side battle array photo-sensitive cell exposes, and the image information of obtaining imported into by optical fiber carries out graphical analysis and judgement in the industrial computer 5.
Fig. 4 shows the flow chart according to the online test method of roundness of continuous casting round billet of the present invention.As shown in Figure 4, this online test method comprises: the step S10 that obtains the end view drawing picture of circle base on the cold bed with the industrial CCD camera with telecentric mirror head; The end face image is carried out the step S12 that threshold value is cut apart; The step S14 that carries out filtering with the ripple of the making an uproar outside object being measured inside in the image after threshold value cut apart; Image after the ripple filtering of making an uproar is carried out the step S16 of row, column scanning with the interference in elimination slag district; And utilize least square method to calculate the center of circle and calculate the step S18 of circularity in view of the above.
In step S10, the industrial CCD camera provides the high temperature protection measure, for example camera is prevented in the high temperature protection housing; the image of its collection is a gray level image as shown in Figure 5, such as 256 grades of gray level images; it not only comprises object being measured, also comprises other objects outside the object being measured.
In step S12, the algorithm that passing threshold is cut apart then obtains the black white image that comprises object being measured and non-object being measured as shown in Figure 6.
In step S14, utilize morphologic denoising method to filtering object being measured inside and the ripple of the making an uproar outside, obtain tondino picture as shown in Figure 7.This step can realize in two steps that also at first the ripple of making an uproar to object being measured inside carries out filtering, and the ripple of making an uproar to the measured object external body carries out filtering again, to reach all purposes of filtering of ripple of making an uproar that object being measured is inside and outside.
In step S16,, obtain circular image as shown in Figure 8 by the image after the ripple filtering of making an uproar being carried out row, column scanning to eliminate the interference in slag district.The denoising method of morphologization can guarantee the accuracy of successive image edge extracting in step S14, yet carrying out with gradient operator after image cuts apart, the edge in slag district has a large amount of overlapping phenomenons, and step S16 can remove lap, to guarantee not comprise in the view data interference in slag district.
In step S18, adopt the least square method calculating center of circle and calculate circularity in view of the above, the advantage that adopts least square method to calculate the center of circle is that its serious forgiveness can reach 15%, when promptly having 15% non-marginal point to be mixed in the data, the center of circle still can converge to the real desirable center of circle, algorithm stability height after the optimizing.
Above steps and is exported corresponding roundness error by in view of the above and the circularity analysis software of design is finished, and can report to the police to exceeding the round base of high setting value, and prompting is controlled personnel and operated accordingly.
Fig. 9 to Figure 12 shows the structural representation according to the image acquisition units 1 of on-line detecting system of the present invention.As shown in Figure 9, image acquisition units 1 comprises collection head 10a, and this collection head 10a is installed on the support 10b, and support 10b is fixed on the wall by swell fixture 27.
As Fig. 9 and shown in Figure 10, collection head 10a comprises the high temperature protection housing and is installed on industrial CCD camera 11, the camera power supply 13 in the housing and is positioned at the telecentric mirror head 12 of camera 11 fronts.This camera power supply 13 also can be arranged on the outside of high temperature protection housing.
This high temperature protection housing preferably is tubular, comprises stack shell 14, rear end cap 18 and the transmission lens 20 that is positioned at stack shell 14 front ends, sees shown in Figure 11.
Wherein, rear end cap 18 is provided with compressed air inlet 17, and it links to each other with the compressed gas source at scene, compressed air enters through stack shell 14 inside from import 17, from the edge ejection of the outer surface of transmission lens 20, the heat of inside is taken away, simultaneously transmission lens 20 is cooled off.
Particularly, as shown in Figure 10 and Figure 11, the front end of stack shell 14 is provided with the air-guide part 21 of annular, this air-guide part 21 has a plurality of gas port 21a that communicate with stack shell 14 inside, this air-guide part 21 and outside barrel form guide ring groove 21b, have briquetting 19a on the trim ring 19 of transmission lens 20, and trim ring 19 is pressed on transmission lens 20 on the stack shell 14 by briquetting, so formed Compressed Gas outlet 21c between transmission lens 20 and the briquetting 19a, so that transmission lens 20 is cooled off reliably.
Further, be formed with cooling water channel 15 on the stack shell 14, this cooling water channel communicates with extraneous cooling water by cooling water inlet 16 and coolant outlet 16 ', forms water cooling, to reduce the heat transfer of stack shell 14.
As Fig. 9, Figure 10 and shown in Figure 12, the left and right sides position adjusting mechanism 26 that has luffing angle governor motion 22, height adjustment mechanism 23 on the support 10b and be used to regulate adjustable shelf 24 and fixed mount 25 positions is so that image acquisition units 1 is aimed at circle base end face.
As can be seen from the above description, the on-line detecting system of roundness of continuous casting round billet of the present invention, have from the function of continuous casting production scene continuous acquisition circle base end view drawing picture, STEELMAKING PRODUCTION factory adopted the method for manual detection to compare more in the past, advantage with continuous detecting, adopt the method for manual detection to be generally sampling observation, each is produced order of classes or grades at school detection circle base quantity and is no more than 10, and behind the employing native system, the steel billet that per tour is produced all can be finished circularity analysis and file, prevented that defective work from flowing out the production scene, and in time defective work information has been sent to master-control room, reminded the site operation personnel that production technology is adjusted.The accuracy of detection of native system is far above the precision that manual detection reached, and the method for manual detection is adopted in the production scene, and accuracy of detection can only reach 0.5mm, and detection system of the present invention, its accuracy of detection reaches 0.01mm.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. the on-line detecting system of a roundness of continuous casting round billet is characterized in that, comprising:
Image acquisition units is arranged on the dead ahead of the end face of the round base on the cold bed, comprises the high temperature protection housing and is arranged in the industrial CCD camera with telecentric mirror head of described high temperature protection housing; And
Control module is connected with described industrial CCD camera signal, and the image that is used for round base end face that described industrial CCD camera is gathered is handled to obtain circle base circularity.
2. the on-line detecting system of roundness of continuous casting round billet according to claim 1 is characterized in that, described industrial CCD camera is connected with described control module signal by fibre optic transmission equipment.
3. the on-line detecting system of roundness of continuous casting round billet according to claim 1; it is characterized in that; described high temperature protection housing has the compressed air inlet and the compressed air outlet of communication with cavity, and described Compressed Gas exports the edge of the outer surface of the transmission lens that is positioned at described high temperature protection housing front portion.
4. the on-line detecting system of roundness of continuous casting round billet according to claim 3 is characterized in that, described high temperature protection housing has support, and described support has left and right sides position adjusting mechanism, height adjustment mechanism and luffing angle governor motion.
5. the on-line detecting system of roundness of continuous casting round billet according to claim 3 is characterized in that, described high temperature protection housing is tubular.
6. the on-line detecting system of roundness of continuous casting round billet according to claim 5 is characterized in that, has the cooling water channel of annular on the barrel of described high temperature protection housing.
7. the on-line detecting system of roundness of continuous casting round billet according to claim 1, it is characterized in that, described control module is used for that the image that described industrial CCD camera is gathered is carried out threshold value and cuts apart, utilize object being measured inside and the ripple of the making an uproar outside in the image after morphologic denoising method is cut apart threshold value to carry out filtering, image after the ripple filtering of making an uproar is carried out the interference of row, column scanning with elimination slag district, and calculate the center of circle and calculate circularity based on the described center of circle with least square method.
8. the on-line detecting system of roundness of continuous casting round billet according to claim 1 is characterized in that, also comprises the lighting unit that illumination is provided to described continuous cast round billets end face.
9. the online test method of a roundness of continuous casting round billet is characterized in that, comprising:
Gather the end view drawing picture of circle base on the cold bed with the industrial CCD camera that the high temperature protection housing is provided with telecentric mirror head;
The end face image is carried out threshold value to be cut apart;
Utilize object being measured inside and the ripple of the making an uproar outside in the image after morphologic denoising method is cut apart threshold value to carry out filtering;
Image after the ripple filtering of making an uproar is carried out row, column scanning to eliminate the interference in slag district; And
Utilize the least square method calculating center of circle and calculate circularity in view of the above.
10. the online test method of roundness of continuous casting round billet according to claim 9 is characterized in that, also comprises the step that illumination is provided to described round base end face.
11. an image collecting device that is used for online acquisition continuous cast round billets end view drawing picture is characterized in that, comprising:
The high temperature protection housing, compressed air inlet and Compressed Gas outlet with communication with cavity, described Compressed Gas exports the edge of the outer surface of the transmission lens that is positioned at described high temperature protection housing front portion; And
Be arranged in the industrial CCD camera with telecentric mirror head of described high temperature protection housing.
12. the image collecting device that is used for online acquisition continuous cast round billets end view drawing picture according to claim 11 is characterized in that described high temperature protection housing is tubular, has the cooling water channel of annular on the barrel of described high temperature protection housing.
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