CN112296297B - Method for controlling water gap blockage and electronic equipment - Google Patents
Method for controlling water gap blockage and electronic equipment Download PDFInfo
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- CN112296297B CN112296297B CN202011059303.2A CN202011059303A CN112296297B CN 112296297 B CN112296297 B CN 112296297B CN 202011059303 A CN202011059303 A CN 202011059303A CN 112296297 B CN112296297 B CN 112296297B
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- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
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- B22D11/18—Controlling or regulating processes or operations for pouring
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Abstract
The invention discloses a method for controlling water gap blockage, which comprises the following steps: acquiring a first plane image of a continuous casting nozzle, wherein the first plane image comprises a first nozzle side hole; in the first plane image, determining a first ratio between unit pixels and unit length and a first area image corresponding to a residual pore area of a first nozzle side hole; determining an actual length value and an actual width value of a side hole of a second nozzle of a new nozzle before continuous casting; then determining a second area image corresponding to the second nozzle side hole equivalent in the first plane image based on the first ratio; and determining the blockage rate of the continuously cast water gap according to the areas of the first area image and the second area image, thereby determining the classification grade of the continuously cast water gap when the current steel grade is cast and the continuous casting heat number of the new water gap when the steel grade is cast. The scheme can quickly and accurately evaluate the water gap blockage degree, reduces the production cost and ensures the product quality.
Description
Technical Field
The application relates to the technical field of steel smelting, in particular to a method for controlling water gap blockage and electronic equipment.
Background
In the continuous casting process, because of the influence of secondary oxidation, slag entrapment and endogenous inclusions, inevitable endogenous inclusions and foreign inclusions in molten steel can be adhered to the wall of a water gap in the process that the molten steel of a tundish enters a crystallizer through the water gap, so that the water gap is blocked and the molten steel flows obliquely. The bias flow of the molten steel directly causes the instability of the liquid level and increases the probability of slag entrapment. In addition, the falling off of large-sized stickies causes serious quality problems to the billet. Therefore, the nozzle needs to be replaced after a certain number of heats are poured, but molten steel with different components and brands has completely different speeds of nozzle blockage during pouring, so that the nozzle blockage condition needs to be accurately evaluated and controlled according to different steel types. At present, no relevant criterion is established for evaluating the blockage condition of the water gap, the continuous casting heat of the water gap is determined mainly by artificially evaluating the blockage rate of the water gap, the subjectivity and uncertainty of an evaluation result are necessarily brought by artificial evaluation, the production cost is inevitably increased, and the invisible risk is brought.
Disclosure of Invention
The invention provides a method for controlling water gap blockage, which aims to solve or partially solve the technical problems that the judgment of the water gap blockage degree is inaccurate and the production cost is increased due to subjectivity and uncertainty of artificially evaluating the water gap blockage degree.
In order to solve the technical problem, the invention provides a method for controlling the water gap blockage, which comprises the following steps:
acquiring a first plane image of a continuous casting nozzle, wherein the first plane image comprises a first nozzle side hole;
in the first plane image, determining a first ratio between unit pixels and unit length and a first area image corresponding to a residual pore area of a first nozzle side hole;
determining an actual length value and an actual width value of a side hole of a second nozzle of a new nozzle before continuous casting;
determining a second area image corresponding to the second nozzle side hole equivalent in the first plane image according to the first ratio, the actual length value and the actual width value;
determining the blockage rate of the water gap after continuous casting according to the areas of the first area image and the second area image;
according to the blockage rate of the water gap after continuous casting, determining the classification and the rating of the water gap after continuous casting when the current steel grade is cast;
and according to the classification grade, determining the continuous casting heat of the new nozzle when the current steel grade is poured.
Optionally, the first area image corresponding to the remaining pore area of the first nozzle side hole is determined according to the following method:
and determining a visible area of the first nozzle side hole in the first plane image, wherein the visible area corresponds to the first area image of the residual pore area.
Further, according to the areas of the first area image and the second area image, determining the blockage rate of the nozzle after continuous casting, specifically comprising:
removing the first area image from the second area image to obtain a residual image;
and determining the ratio of the first pixel quantity of the residual image to the second pixel quantity of the second area image, and determining the ratio as the blockage rate of the continuous casting nozzle.
Further, according to the blockage rate of the nozzle after continuous casting, determining the classification grade of the nozzle after continuous casting when the current steel grade is cast, specifically comprising the following steps:
if the value of the blockage rate is 0-30%, the classification grade of the water gap after continuous casting is 11 grades;
if the blockage rate is 30-60%, classifying and grading the water gap after continuous casting to be 12 grades;
if the value of the clogging rate is > 60%, the classification of the nozzle after continuous casting is rated as class 13.
Further, according to the classification rating, determining the continuous casting heat of the new nozzle when the current steel grade is cast, specifically comprising:
if the classification grade is 11, increasing the continuous casting heat of the new nozzle when the current steel grade is cast;
if the classification grade is 12 grades, the continuous casting heat number of the new nozzle in the process of casting the current steel grade is kept unchanged;
and if the classification grade is 13, reducing the continuous casting heat of the new nozzle when the current steel grade is cast.
According to the technical scheme, the actual length value and the actual width value of the second nozzle side hole of the new nozzle before continuous casting are determined, and the method specifically comprises the following steps:
acquiring a second plane image of the new nozzle before continuous casting, wherein the second plane image comprises a second nozzle side hole;
determining a second ratio between unit pixels and unit lengths in the second planar image;
determining the length pixel value and the width pixel value of a second nozzle side hole in a second plane image;
and determining the actual length value and the actual width value of the second water gap side hole according to the second ratio, the length pixel value and the width pixel value.
Further, determining a second ratio between the unit pixel and the unit length in the second planar image specifically includes:
acquiring an actual width value of the end part of the nozzle positioned below the side hole of the second nozzle in the new nozzle;
determining an end pixel value occupied by the end of the water gap in the width direction;
and determining a second ratio between the unit pixel and the unit length in the second plane image according to the actual value of the width of the water gap end part and the value of the end pixel.
Based on the same inventive concept of the above technical scheme, the invention also provides a device for controlling the water gap blockage, which comprises:
the acquisition module is used for acquiring a first plane image of the continuous casting nozzle, and the first plane image comprises a first nozzle side hole;
the first determining module is used for determining a first ratio between unit pixels and unit length and a first area image corresponding to a residual pore area of the first nozzle side hole in the first plane image;
the second determining module is used for determining the actual length value and the actual width value of a second nozzle side hole of the new nozzle before continuous casting;
the third determining module is used for determining a second area image corresponding to the second nozzle side hole equivalent in the first plane image according to the first ratio, the actual length value and the actual width value;
the fourth determining module is used for determining the blockage rate of the water gap after continuous casting according to the areas of the first area image and the second area image;
the fifth determining module is used for determining the classification and the rating of the continuously cast water gap when the current steel grade is cast according to the blockage rate of the continuously cast water gap;
and the sixth determining module is used for determining the continuous casting heat of the new nozzle when the current steel grade is cast according to the classification rating.
Based on the same inventive concept of the foregoing technical solutions, the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the steps of any one of the foregoing technical solutions are implemented.
Through one or more technical schemes of the invention, the invention has the following beneficial effects or advantages:
the invention provides a method for controlling water gap blockage, which comprises the steps of acquiring a horizontal plane image after pouring, determining a first area image corresponding to a residual pore area from the plane image, then determining a ratio between pixels and distances in the plane image, determining a second area image in which a water gap side hole of a new water gap is equivalent to an old water gap image according to actual values of the length and the width of the water gap side hole of the new water gap, and then determining the water gap blockage degree by comparing the areas of the two area images so as to guide the accurate control of a subsequent continuous casting furnace; according to the scheme, subjectivity and uncertainty caused by the degree of water gap blockage evaluation can be avoided, and meanwhile, image acquisition and pixel measurement can be quickly realized through the image acquisition equipment and the image processing tool, so that the evaluation efficiency is obviously improved while the result accuracy is ensured, the degree of water gap blockage evaluation and the corresponding pouring heat control are convenient, quick and accurate, the production cost can be reduced, and the product quality is ensured.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 shows a flow chart of a method of controlling nozzle clogging according to one embodiment of the present invention;
FIG. 2 shows a photograph of the topography of a post-pouring nozzle according to one embodiment of the present invention;
FIG. 3 shows a topographical photograph of a new nozzle prior to casting in accordance with one embodiment of the present invention;
FIG. 4 shows a schematic view of the visible area of the remaining void area of a post-pour nozzle in an image processing tool according to one embodiment of the present invention;
FIG. 5 shows a full nozzle side hole schematic of a pre-pour new nozzle in an image processing tool according to one embodiment of the present invention;
FIG. 6 shows a schematic view after removal of the remaining void area in the full nozzle side hole according to one embodiment of the present invention;
fig. 7 shows a schematic view of an arrangement for controlling nozzle clogging according to an embodiment of the present invention.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments. Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control. Unless otherwise specifically stated, various apparatuses and the like used in the present invention are either commercially available or can be prepared by existing methods.
In order to solve the subjectivity and uncertainty of artificially evaluating the degree of nozzle clogging, through research, in an alternative embodiment, as shown in fig. 1, a method for controlling nozzle clogging is provided, and the overall idea is as follows:
s1: acquiring a first plane image of a continuous casting nozzle, wherein the first plane image comprises a first nozzle side hole;
specifically, after pouring the nozzle, a photo of a nozzle side hole area of the nozzle is taken by using a photographing device, such as a mobile phone, a digital camera or an on-site industrial image capturing device, and as shown in fig. 2, the photo should include a nozzle side hole and an end area (upper side in the figure) located below the nozzle side hole.
S2: in the first plane image, determining a first ratio between unit pixels and unit length and a first area image corresponding to a residual pore area of a first nozzle side hole;
specifically, the new nozzle before use has a complete nozzle side hole, the nozzle after casting is usually blocked to different degrees, the remaining pore area is the pore area of the new nozzle minus the blocked pore area, in the picture obtained in step S1, the pore area image of the nozzle after casting is the remaining pore area, and the corresponding first area image can be determined according to the gray scale difference between the pore area in the image and the nozzle base body by using an image editing tool. A first ratio between the unit pixel and the unit length represents a proportional relation between the pixel and the distance in a first plane image (namely a picture of a water gap after pouring); and determining the corresponding actual straight-line distance between the two points according to the first ratio and the measured pixel quantity between the two points in the first plane image. Due to the inevitable differences in the shooting parameters under different conditions, a first ratio between pixels and length needs to be determined in the first planar image taken each time.
Whether the new nozzle is before pouring or the old nozzle is after pouring, the distance value of the end part of the lower part of the nozzle side hole (corresponding to the upper part of the nozzle side hole in the figure 2) is fixed, such as 120mm, and the influence of smelting environment is extremely small, so that the proportional relation between pixels and the distance can be determined by taking the known distance as a standard. Optionally, the first ratio between the characterization pixel and the distance may be determined by the following method:
s21: acquiring a width actual value of a water gap end part below a water gap side hole in the first plane image;
s22: determining an end pixel value occupied by the end of the water gap in the width direction;
specifically, in the image processing tool, a horizontal straight line may be drawn in the end region by the scale tool, thereby obtaining a pixel value of the width occupied by the end of the nozzle.
S23: and determining a first ratio between the unit pixel and the unit length in the first plane image according to the actual value of the width of the water gap end part and the value of the end part pixel.
That is, the actual value of the width of the nozzle tip and the measured tip pixel value are known, and the first ratio is calculated.
S3: determining an actual length value and an actual width value of a side hole of a second nozzle of a new nozzle before continuous casting;
specifically, the second nozzle side hole is a nozzle side hole of the new nozzle before pouring, and the cross section of the second nozzle side hole is rectangular, as shown in fig. 3. The length value and the width value of the side hole of the new nozzle can be determined by product manual inquiry or actual measurement.
S4: determining a second area image corresponding to the second nozzle side hole equivalent in the first plane image according to the first ratio, the actual length value and the actual width value;
s5: determining the blockage rate of the water gap after continuous casting according to the areas of the first area image and the second area image;
specifically, the degree of nozzle blockage essentially represents the proportional relationship between the residual pores of the side holes of the nozzle after pouring and the complete pores of the side holes of the nozzle of the new nozzle. Therefore, the blockage condition of the nozzle can be accurately evaluated by measuring the area of the nozzle side hole image of the new nozzle and the area of the residual pore image of the old nozzle after pouring. In order to evaluate the accuracy, the area occupied by the nozzle side hole of the new nozzle needs to be determined effectively in the first plane image (old nozzle photo). Since the nozzle side hole of the new nozzle before pouring has a regular rectangular cross section, the pixel values occupied by the length and the width of the nozzle side hole of the new nozzle can be respectively calculated according to the actual length value and the actual width value of the new nozzle in S3 and the first ratio determined in S2, and the second area image of the nozzle side hole of the new nozzle when being equivalent to the first plane image can be determined through the length pixel value and the width pixel value. Next, the blockage rate of the old nozzle can be calculated by determining the areas of the remaining pore area image (first area image) of the old nozzle after casting and the pore area image (second area image) of the new nozzle before casting. Specifically, the clogging rate of the old gate is [1- (second region image area-first region image area)/second region image area ] × 100%. In fact, the areas of the first region image and the second region image can be characterized by the corresponding pixel quantities, and therefore, the occlusion rate can be calculated by measuring the pixel quantities of the first region image and the second region image.
S6: according to the blockage rate of the water gap after continuous casting, determining the classification and the rating of the water gap after continuous casting when the current steel grade is cast;
s7: and according to the classification grade, determining the continuous casting heat of the new nozzle when the current steel grade is poured.
Specifically, the nozzle is graded according to the different sizes of the blockage rates, the grading of the nozzle needs to be combined with specific steel types, and the influence on the speed of the nozzle blockage is obviously different due to the molten steel with different components. Therefore, by evaluating the blockage level of the nozzle under the current continuous casting furnace number, the most appropriate continuous casting furnace number of the new nozzle when the new nozzle is used for casting the molten steel of the variety subsequently can be determined.
In a word, the scheme provides a plane image for collecting the side hole of the nozzle after pouring, a first area image corresponding to the residual pore area is determined from the plane image, then a second area image equivalent to the side hole of the new nozzle in the old nozzle image can be determined by determining the ratio of pixels to the distance in the plane image according to the actual length and width values of the side hole of the new nozzle, and then the nozzle blockage degree can be determined by comparing the areas of the two area images so as to guide the accurate control of the subsequent continuous casting furnace number.
The method of taking pictures and measuring pixels is adopted in the embodiment, so that the time efficiency of evaluating the water gap blockage is improved. Before this scheme, other two kinds of modes have been tried out and have evaluated the mouth of a river jam condition: firstly, measuring the volume of a side hole of a new nozzle and the residual volume of the side hole of an old nozzle after pouring through a solution, and determining the blocking condition according to the volume ratio; secondly, rubbing the old water gap after pouring, rubbing the appearance of the side hole of the water gap containing the blocking object through the covering cloth with grids and rubbing equipment, determining the number of the grids covered by the blocking object through image analysis, and further evaluating the blocking degree of the water gap. However, both of these solutions have some problems: on one hand, the measurement can be carried out only after the nozzle is completely cooled, so that the process is time-consuming, and rapid evaluation and timely continuous casting control adjustment cannot be carried out; for a solution volume method, preparing corresponding solution and a device to measure the volume of a side hole of a water gap of an old water gap; for the rubbing method, a mesh overlay and a rubbing device are required to be prepared to perform rubbing; on the other hand, the accuracy of the nozzle blockage rate evaluated by the solution volume method and the rubbing method is in some problems, the nozzle side hole is a three-dimensional space, the solution volume method can seriously block the position near a certain height level inside the side hole, the other parts are obviously distorted under the condition of no blockage, and the determined nozzle blockage level is obviously lower than the actual service condition; and rubbing method is difficult to carry out complete rubbing to the plug that has unsmooth uneven space appearance, and to unsmooth uneven plug, because the influence rubbing area in space is actually bigger partially, and mouth of a river total area is planar area to influence evaluation result. The image and pixel method provided by the embodiment reduces the interference of the spatial distribution morphology of the blockage on the blockage rating; meanwhile, the scheme is simple in operation process, the water gap can be photographed immediately after being replaced, the photographed image is guided into the image processing tool to be processed without waiting for cooling, and therefore the water gap blockage grade can be evaluated quickly by means of the image processing tool.
In summary, the present embodiment provides a method for controlling nozzle clogging, which includes acquiring a horizontal planar image after pouring, determining a first area image corresponding to a remaining pore area from the planar image, then determining a ratio between pixels and distances in the planar image, determining a second area image, equivalent to an old nozzle image, of a nozzle side hole of a new nozzle according to actual values of length and width of the nozzle side hole of the new nozzle, and then determining a nozzle clogging degree by comparing areas of the two area images, so as to guide accurate control of a subsequent continuous casting furnace. According to the scheme, subjectivity and uncertainty caused by the degree of water gap blockage evaluation can be avoided, and meanwhile, image acquisition and pixel measurement can be quickly realized through the image acquisition equipment and the image processing tool, so that the evaluation efficiency is obviously improved while the result accuracy is ensured, the degree of water gap blockage evaluation and the corresponding pouring heat control are convenient, quick and accurate, the production cost can be reduced, and the product quality is ensured.
In the foregoing embodiment, the determination of the second region image representing the nozzle side hole of the new nozzle before pouring, the determination of the first image region representing the nozzle side hole of the old nozzle after pouring, and the measurement of the ratio between the pixel and the distance may be implemented by an image processing tool, or by a secondary development processing system, inputting a photographed image in the processing system, and then calling the image processing tool to implement the image processing.
Therefore, based on the same inventive concept of the previous embodiment, in another alternative embodiment, the first region image corresponding to the remaining pore region of the first nozzle side hole is determined according to the following method: and determining a visible area of the first nozzle side hole in the first plane image, wherein the visible area corresponds to the first area image of the residual pore area.
An alternative way is to determine the visible area of the remaining pore area in the first plane image by using the color or gray scale difference between the pore area and the nozzle matrix in the first plane image, with the help of an image processing software, such as an irregular frame selection tool or a quick selection tool of PhotoShop software, as shown in fig. 4.
Optionally, S5: according to the areas of the first area image and the second area image, the blockage rate of the nozzle after continuous casting is determined, and the method specifically comprises the following steps:
s51: removing the first area image from the second area image to obtain a residual image;
s52: and determining the ratio of the first pixel quantity of the residual image to the second pixel quantity of the second area image, and determining the ratio as the blockage rate of the continuous casting nozzle.
In the planar image, the area of a certain region image may be characterized by the amount of pixels occupied by the certain region image in the planar image, so an optional implementation manner is as follows: newly building a first image layer and a second image layer in Photoshop software, wherein the first image layer comprises a first area image, the second image layer comprises a second area image, and the first area image and the second area image have different filling colors;
and combining the first image layer and the second image layer into a third image layer, determining the ratio of the first pixel quantity of the residual image to the second pixel quantity of the second area image after the first area image is deducted from the second area image by using a histogram tool of Photoshop software, and determining the ratio as the blockage rate of the nozzle after continuous casting.
As shown in fig. 5, the second area image in the second image layer is rectangular, and the area occupied by the second area image when the second area image is equivalent to the first plane image can be determined according to the actual length value and the width value of the nozzle side hole of the new nozzle and the first ratio determined from the first plane image.
Because the image in the first image layer is the residual pore area of the nozzle side hole of the nozzle after pouring, the image in the second image layer is the pore area of the nozzle side hole of the new nozzle before pouring, and the first image layer and the second image layer have the same pixel-distance proportional relation (first ratio), the pixel amount occupied by the residual image is measured by an image processing tool at this time, and the blockage rate of the nozzle can be determined, wherein the schematic diagram is shown in fig. 6.
After the blockage rate of the nozzle is determined, the nozzle is graded, optionally, the classification grade of the nozzle after continuous casting when the current steel grade is poured is determined according to the blockage rate of the nozzle after continuous casting, which specifically comprises:
if the value of the blockage rate is 0-30%, the classification grade of the water gap after continuous casting is 11 grades;
if the blockage rate is 30-60%, classifying and grading the water gap after continuous casting to be 12 grades;
if the value of the clogging rate is > 60%, the classification of the nozzle after continuous casting is rated as class 13.
What the jam rate characterization is that the plug accounts for the percentage value of the complete mouth of a river side opening area of new mouth of a river, according to the classification that the mouth of a river blockked up, can instruct the new mouth of a river to set up reasonable continuous casting heat, and is further, according to categorised rating, confirms the continuous casting heat of new mouth of a river when pouring current steel grade, specifically includes:
if the classification grade is 11, increasing the continuous casting heat of the new nozzle when the current steel grade is cast;
if the classification grade is 12 grades, the continuous casting heat number of the new nozzle in the process of casting the current steel grade is kept unchanged;
and if the classification grade is 13, reducing the continuous casting heat of the new nozzle when the current steel grade is cast.
That is, if a certain steel grade is seriously blocked at the lower nozzle of the current continuous casting furnace, the continuous casting furnace can be properly reduced and the blocking rate can be measured again, if the blocking rate is lower, the continuous casting furnace of the nozzle can be improved, and the specific change amount of the continuous casting furnace needs to be determined according to different steel grades respectively. So, can confirm the best continuous casting heat according to the steel grade of difference, improve the rate of utilization at the mouth of a river and the stability of production, improve product quality, avoid appearing the production risk.
Generally speaking, the size specification of the nozzle side hole of the new nozzle can be determined by a product manual or a quality certificate, but there is a certain difference in the rectangular cross section of each nozzle side hole, and in the present application, the clogging rate is essentially calculated by pixels, so that, in order to unify the measurement conditions and improve the measurement consistency, based on the same inventive concept of the foregoing embodiment, in a further alternative embodiment, the determining the actual length value and the actual width value of the second nozzle side hole of the new nozzle before continuous casting specifically includes:
acquiring a second plane image of the new nozzle before continuous casting, wherein the second plane image comprises a second nozzle side hole;
determining a second ratio between unit pixels and unit lengths in the second planar image;
determining the length pixel value and the width pixel value of a second nozzle side hole in a second plane image;
and determining the actual length value and the actual width value of the second water gap side hole according to the second ratio, the length pixel value and the width pixel value.
In a word, the consistency of the shooting parameters and the shooting angle of the new nozzle with the old nozzle is ensured as much as possible, the ratio of the pixel in the second plane image to the distance is determined, then the length pixel value and the width pixel value of the side hole of the nozzle in the second plane image are measured, and the actual length and the actual width value are further determined.
Optionally, the determining manner of the second ratio is the same as the determining manner of the first ratio, which is specifically as follows:
determining a second ratio between the unit pixel and the unit length in the second planar image, specifically comprising:
acquiring an actual width value of the end part of the nozzle positioned below the side hole of the second nozzle in the new nozzle; determining an end pixel value occupied by the end of the water gap in the width direction; and determining a second ratio between the unit pixel and the unit length in the second plane image according to the actual value of the width of the water gap end part and the value of the end pixel.
Optionally, a ruler tool (such as Photoshop software) in the image processing software is used to determine the length pixel value and the width pixel value of the side hole of the second nozzle, and the end pixel value of the end part of the nozzle in the width direction.
The following describes the process of the above method with reference to a specific embodiment:
after 7 furnaces are continuously cast for a certain steel grade, a water gap needs to be replaced:
(1) photographing the replaced water gap to obtain a first plane image including a water gap side hole and a lower end part of the blocked water gap;
(2) and selecting the blocked visible area in the first plane image by adopting a 'quick selection tool' of Photoshop software. Pasting the image of the area into the newly-built layer 1, and filling white, as shown in fig. 4;
(3) knowing that the width of the lower end of the side hole of the nozzle is 120mm, measuring by using a ruler tool of Photoshop software to obtain a pixel value of the width, and thus obtaining a first ratio of the pixel in the image to the actual width;
(4) calculating to obtain corresponding pixel values of the length and the width of the equal-area rectangle of the new nozzle in the first plane image according to the width value (60mm), the length value (80mm) and the first ratio of the nozzle side hole of the new nozzle; newly building a layer 2, putting a rectangular picture with the same area as the side hole of the brand new water gap into the layer 2, and filling black, as shown in fig. 5;
(5) combining the layers 1 and 2 into a layer 3, and detecting the proportion of the black area remained in the layer 3 after the layer 1 is deducted by using a histogram, so as to obtain that the blockage area ratio of the side hole of the water gap is 79.18%, as shown in fig. 6;
(6) the water gap is evaluated to be 13 grade, which shows that the water gap is seriously blocked after 7 furnaces of continuous casting of the current steel grade, the water gap is adjusted to be 5 furnaces of continuous casting and then is replaced by a new water gap, tracking shows that the blocking grade of the adjusted water gap is 12 grade, the product quality of a casting blank is good, and obvious slag entrapment and other quality problems do not occur.
The width value and the length value of the side hole of the new nozzle can be determined in advance by adopting the following methods:
(1) taking a fresh water gap for photographing to obtain a second plane image including a side hole and a lower end of the water gap;
(2) knowing that the width of the lower end is 120mm, the pixel occupied by the end is measured 181, thus giving a second ratio of pixel to actual width 181: 120 of a solvent;
(3) and continuously measuring in the second plane image to obtain the length and width pixel values of the rectangle corresponding to the equal area of the side hole of the new water port, which are respectively 120.7 and 90.5, and then determining that the length value is 80mm and the width value is 60mm according to the second ratio.
Based on the same inventive concept of the previous embodiment, in another alternative embodiment, as shown in fig. 7, there is further provided an apparatus for controlling the clogging of a nozzle, comprising:
the acquisition module 10 is configured to acquire a first plane image of a nozzle after continuous casting, where the first plane image includes a first nozzle side hole;
a first determining module 20, configured to determine, in the first plane image, a first ratio between a unit pixel and a unit length and a first area image corresponding to a remaining pore area of the first nozzle side hole;
the second determining module 30 is configured to determine an actual length value and an actual width value of a second nozzle side hole of the new nozzle before continuous casting;
the third determining module 40 is configured to determine, according to the first ratio, the actual length value, and the actual width value, a second area image corresponding to the second nozzle side hole equivalent in the first plane image;
the fourth determining module 50 is configured to determine a blockage rate of the nozzle after continuous casting according to areas of the first area image and the second area image;
a fifth determining module 60, configured to determine a classification rating of the continuously cast nozzle when the current steel grade is cast according to the blockage rate of the continuously cast nozzle;
and the sixth determining module 70 is used for determining the continuous casting heat of the new nozzle when the current steel grade is poured according to the classification rating.
Based on the same inventive concept of the foregoing embodiments, in another alternative embodiment, an electronic device is further provided, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor executes the computer program, the steps of any one of the methods in the foregoing embodiments are implemented.
Through one or more embodiments of the present invention, the present invention has the following advantageous effects or advantages:
the invention provides a method for controlling water gap blockage, which comprises the steps of acquiring a horizontal plane image after pouring, determining a first area image corresponding to a residual pore area from the plane image, then determining a ratio between pixels and distances in the plane image, determining a second area image in which a water gap side hole of a new water gap is equivalent to an old water gap image according to actual values of the length and the width of the water gap side hole of the new water gap, and then determining the water gap blockage degree by comparing the areas of the two area images so as to guide the accurate control of a subsequent continuous casting furnace; according to the scheme, subjectivity and uncertainty caused by the degree of water gap blockage evaluation can be avoided, and meanwhile, image acquisition and pixel measurement can be quickly realized through the image acquisition equipment and the image processing tool, so that the evaluation efficiency is obviously improved while the result accuracy is ensured, the degree of water gap blockage evaluation and the corresponding pouring heat control are convenient, quick and accurate, the production cost can be reduced, and the product quality is ensured.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (8)
1. A method of controlling nozzle clogging, the method comprising:
acquiring a first plane image of a continuously cast nozzle, wherein the first plane image comprises a first nozzle side hole;
in the first plane image, determining a first ratio between unit pixels and unit length and a first area image corresponding to a residual pore area of the first nozzle side hole;
determining the actual length value and the actual width value of a side hole of a second nozzle of a new nozzle before continuous casting, comprising the following steps: acquiring a second plane image of the new nozzle before continuous casting, wherein the second plane image comprises a second nozzle side hole; determining a second ratio between unit pixels and unit lengths in the second planar image; determining a length pixel value and a width pixel value of the second nozzle side hole in the second planar image; determining an actual length value and an actual width value of the second nozzle side hole according to the second ratio, the length pixel value and the width pixel value;
determining a second area image corresponding to the second nozzle side hole equivalent in the first plane image according to the first ratio, the actual length value and the actual width value;
determining the blockage rate of the continuously cast water gap according to the areas of the first area image and the second area image;
according to the blockage rate of the continuously cast water gap, determining the classification grade of the continuously cast water gap when the current steel grade is cast;
and determining the continuous casting heat of the new nozzle when the current steel grade is cast according to the classification rating.
2. The method of claim 1, wherein determining the first region image corresponding to the remaining pore region of the first nozzle side hole is based on:
determining a visible region of the first nozzle side opening in the first planar image, the visible region corresponding to a first region image of the remaining pore region.
3. The method according to claim 2, wherein the determining the clogging rate of the nozzle after continuous casting according to the areas of the first area image and the second area image specifically comprises:
removing the first area image from the second area image to obtain a residual image;
and determining the ratio of the first pixel quantity of the residual image to the second pixel quantity of the second area image, and determining the ratio as the blockage rate of the water gap after continuous casting.
4. The method according to claim 3, wherein the determining the classification rating of the continuously cast nozzle when casting the current steel grade according to the clogging rate of the continuously cast nozzle comprises:
if the blockage rate is 0-30%, the classification grade of the water gap after continuous casting is 11 grade;
if the blockage rate is 30-60%, the classification grade of the water gap after continuous casting is 12 grade;
and if the value of the blockage rate is greater than 60%, the classification of the water gap after continuous casting is graded as 13.
5. The method of claim 4, wherein said determining a continuous casting heat of said new nozzle in casting said current steel grade based on said classification rating comprises:
if the classification grade is 11 grades, increasing the continuous casting heat of the new nozzle during casting the current steel grade;
if the classification grade is 12 grade, the continuous casting heat of the new nozzle in the process of casting the current steel grade is kept unchanged;
and if the classification grade is 13 grades, reducing the continuous casting heat of the new nozzle during the casting of the current steel grade.
6. The method of claim 1, wherein determining a second ratio between unit pixels and unit lengths in the second planar image comprises:
acquiring the actual width value of the end part of the nozzle positioned below the side hole of the second nozzle in the new nozzle;
determining an end pixel value occupied by the water gap end in the width direction;
and determining a second ratio between the unit pixel and the unit length in the second plane image according to the actual value of the width of the water gap end and the value of the end pixel.
7. An apparatus for controlling the clogging of a nozzle, said apparatus comprising:
the acquisition module is used for acquiring a first plane image of a continuous casting nozzle, wherein the first plane image comprises a first nozzle side hole;
the first determining module is used for determining a first ratio between unit pixels and unit length and a first area image corresponding to a residual pore area of the first nozzle side hole in the first plane image;
the second confirms the module for confirm the actual length value and the actual width value of the second mouth of a river side opening of new mouth of a river before continuous casting, include: acquiring a second plane image of the new nozzle before continuous casting, wherein the second plane image comprises a second nozzle side hole; determining a second ratio between unit pixels and unit lengths in the second planar image; determining a length pixel value and a width pixel value of the second nozzle side hole in the second planar image; determining an actual length value and an actual width value of the second nozzle side hole according to the second ratio, the length pixel value and the width pixel value;
a third determining module, configured to determine, according to the first ratio, the actual length value, and the actual width value, a second area image corresponding to the second nozzle-side hole equivalent in the first plane image;
the fourth determining module is used for determining the blockage rate of the water gap after continuous casting according to the areas of the first area image and the second area image;
the fifth determining module is used for determining the classification grade of the continuously cast water gap when the current steel grade is cast according to the blockage rate of the continuously cast water gap;
and the sixth determining module is used for determining the continuous casting heat of the new nozzle during the casting of the current steel grade according to the classification rating.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method of any one of claims 1 to 6 when executing the program.
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| CN1152267A (en) * | 1995-03-29 | 1997-06-18 | 新日本制铁株式会社 | Prediction and control of quality of continuously cast article |
| CN107192714A (en) * | 2017-06-01 | 2017-09-22 | 首钢总公司 | A kind of method and system for measuring Submerged Nozzle Clogging Course degree |
| CN111678603A (en) * | 2020-06-09 | 2020-09-18 | 首钢集团有限公司 | Detection device and method for degree of blockage of submerged nozzle |
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2020
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1152267A (en) * | 1995-03-29 | 1997-06-18 | 新日本制铁株式会社 | Prediction and control of quality of continuously cast article |
| US5884685A (en) * | 1995-03-29 | 1999-03-23 | Nippon Steel Corporation | Quality prediction and quality control of continuous-cast steel |
| CN107192714A (en) * | 2017-06-01 | 2017-09-22 | 首钢总公司 | A kind of method and system for measuring Submerged Nozzle Clogging Course degree |
| CN111678603A (en) * | 2020-06-09 | 2020-09-18 | 首钢集团有限公司 | Detection device and method for degree of blockage of submerged nozzle |
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