CN114540581B - RH vacuum treatment regulation and control method - Google Patents
RH vacuum treatment regulation and control method Download PDFInfo
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- CN114540581B CN114540581B CN202210187372.4A CN202210187372A CN114540581B CN 114540581 B CN114540581 B CN 114540581B CN 202210187372 A CN202210187372 A CN 202210187372A CN 114540581 B CN114540581 B CN 114540581B
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Abstract
The invention belongs to the technical field of RH vacuum treatment, and particularly relates to a regulating and controlling method of RH vacuum treatment, which comprises the following steps: in the RH vacuum treatment process, an image with a brightness change part at the bottom of the vacuum tank is obtained in real time based on an image recognition mechanism at the top of the vacuum tank; obtaining the area change or the length change of a dark part in the image at the current moment according to the image at each moment; judging whether the area change or the length change accords with a corresponding first threshold range or not based on the area change or the length change, and starting a cold steel melting process if the area change or the length change accords with the first threshold range; and judging whether the steel meets the corresponding second threshold range, and if the steel meets the second threshold range, starting the cold steel melting process. According to the invention, through the image recognition system, the area change or the length change of the dark part in the image is obtained, and the degree of the junction steel in the tank is judged in real time by combining with the corresponding threshold range, so that the corresponding operation of the RH furnace is guided.
Description
Technical Field
The invention belongs to the technical field of RH vacuum treatment, and particularly relates to a regulating and controlling method of RH vacuum treatment.
Background
At present, after each molten steel furnace is processed, on-site operators visually observe the condition of a camera in a vacuum groove in real time, as the number of the molten steel furnaces processed by RH is increased, the number of cold steel in the groove is increased, the 'visual field' which can be observed by the camera in the groove is reduced (the observable diameter is reduced, the observable part is a bright part, the visual sense is bright, the cold steel at other outer edges is blackened, the visual sense is dark), and whether the cold steel is formed or not is judged according to the visual field. However, by looking at the change in field of view of the camera in the tank, the degree of the cold steel is felt, or based on experience (e.g., 15 uses of the dip tube), and then a decision is made as to whether to melt the cold steel, due to the reliance on manual visual inspection; and the condition that the cooling steel is advanced or delayed often occurs. The cooling steel can lead to more cooling steel frequency in advance, and the overall cost and the energy consumption are increased; the delay of the cold-rolled steel can cause the pollution of the cold-rolled steel to the molten steel which is processed later when the cold-rolled steel is serious, thereby causing quality accidents.
In this regard, some researches are carried out in the prior art, but more researches are only carried out on how to achieve the purpose of cooling steel by controlling the means such as ' coal oxygen lance flow rate, proportion, lance position, alloy oxidation heat release ' when conditions such as ' temperature of molten steel to an RH station, oxygen content in molten steel to the RH station, aperture of a dipping tube, vacuum degree in an RH tank, degree of cooling steel and the like are basically known ', but the conditions such as ' arrival temperature, vacuum degree ' and the like can be measured and obtained by corresponding equipment in all steel plants, but the ' real-time inner diameter of the dipping tube and the like cannot be measured in real time by the existing means, and further the corresponding operation of an RH furnace cannot be guided.
Disclosure of Invention
The invention aims to overcome the defect that the RH treatment effect is influenced by roughly judging whether to chill the steel or not through manual visual inspection of the visual field of a camera in the prior art, and provides a regulating and controlling method for RH vacuum treatment.
In order to achieve the above object, the present invention provides a method for controlling RH vacuum treatment, comprising: during the process of the RH vacuum treatment,
based on an image recognition mechanism positioned at the top of the vacuum tank, acquiring an image with a brightness change part at the bottom of the vacuum tank in real time;
obtaining the area change or the length change of a dark part in the image at the current moment according to the image at each moment;
judging whether the area change or the length change accords with a corresponding first threshold range or not based on the area change or the length change, and starting a cold steel melting process if the area change or the length change accords with the first threshold range; judging whether the steel meets a corresponding second threshold range, and if the steel meets the second threshold range, starting a cold steel melting process; wherein the area change or the length change has a correspondence relation with the extent of the gellan steel with its corresponding threshold range.
In a first embodiment, the area change of the dark portions in the image is a ratio Δs of the difference between the areas of all the dark portions in the image and the area of the dark portions in the image where the dip tube is located to the total area of the image, and the first threshold range is 65-74%, and the second threshold range is 75-95%.
In some preferred embodiments, the obtaining, from the image at each time, an area change of a dark portion in the image at the current time includes:
obtaining all dark part areas in the image, the dark part area where the dip tube is positioned in the image and the total area of the image at the current moment according to the image at each moment;
and obtaining the ratio delta S of the difference value of the areas of all the dark parts in the image and the area of the dark parts in the image to the total area of the image based on the areas of all the dark parts in the image, the area of the dark parts in the image and the total area of the image at the moment.
In a second embodiment, the area change of the dark portion in the image is a ratio Δa of the total area value of the dark portion of the dip tube in the image at the current time to the total area value of the dip tube at the initial time, and the first threshold range is 40-60%, and the second threshold range is 10-39%.
In some preferred embodiments, the obtaining, from the image at each time, an area change of a dark portion in the image at the current time includes:
according to the image at each moment, obtaining the total area of the dark part of the dip tube in the image at the current moment and the total area of the dip tube at the initial moment;
and obtaining the proportion delta A of the total area value of the current time of the dark part of the dip tube in the image to the total area value of the initial time based on the total area of the current time and the total area of the initial time of the dark part of the dip tube in the image.
In a third embodiment, the image is square by adjusting the image recognition mechanism, and
the length of the dark part in the image is changed to be a difference DeltaL between the side length a of the square and the equivalent diameter b of the bright part in the image, the first threshold range is 5-7cm, and the second threshold range is 8-9cm.
In some preferred embodiments, the modulation method further comprises:
and obtaining the inner diameter change delta D of the dark part where the dip pipe is positioned in the image at the current moment according to the image at each moment, judging whether the delta D accords with a third threshold range, and if the delta D accords with the third threshold range, severely corroding the dip pipe at the current moment and needing to be replaced off line.
More preferably, the inner diameter variation Δd is an inner diameter difference and the third threshold value is in the range of 6-12cm.
In some preferred embodiments, the obtaining, from the image at each time, a change Δd of the inner diameter of the dark portion where the dip tube is located in the image at the current time includes:
according to the image at each moment, obtaining the real-time inner diameter of the dark part where the dip pipe is positioned in the image at the current moment and the inner diameter at the initial moment;
and obtaining the inner diameter change delta D of the dark part of the dip pipe in the image at the current moment based on the real-time inner diameter of the dark part of the dip pipe in the image and the inner diameter at the initial moment.
In some preferred embodiments, the modulation method further comprises:
based on the real-time inner diameter of the dark part where the dip pipe is located in the image at the current moment, according to the corresponding relation between the inner diameter d of the dip pipe and the circulation flow Q and the circulation flow G, and according to the corresponding relation between the circulation flow G and the high vacuum time t and the circulation flow total amount M, the circulation flow G or the high vacuum time t required by the vacuum treatment at the current moment RH is obtained;
and carrying out RH vacuum treatment process based on the circulation flow G or the high vacuum time t required by the RH vacuum treatment at the current moment.
According to the invention, through the image recognition system, the area change or the length change of the dark part in the image is obtained, and the degree of the junction steel in the tank is judged in real time by combining with the corresponding threshold range, so that the corresponding operation of the RH furnace is guided. Further, through a great deal of practical experience and research, three specific corresponding relations related to the quantized cold steel degree are provided, so that whether the quantized cold steel is needed or not can be accurately judged through testing, and the corresponding operation of the RH furnace can be conveniently and definitely guided. Based on the inner diameter change of the dark part where the dip pipe is located in the measured image, a clear corresponding relation for judging the erosion degree of the dip pipe is provided so as to judge whether the dip pipe needs to be replaced off line or not; and further regulating the circulation air flow G or the high vacuum time t, thereby saving the circulation air flow or shortening the high vacuum time, and being used for regulating the production rhythm or increasing the soft blowing time of the furnace.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of an image structure at the initial time of the present invention.
FIG. 2 is a schematic view of the structure of the present invention in the case of more gellan steel at a certain time.
Description of the reference numerals
1-vacuum tank, 2-dip tube, 3-dark part, 4-bright part.
Detailed Description
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
In the present invention, the bright portion 4 of the image in which the brightness varies is relative to the dark portion 3, that is, the image is divided into the bright portion 4 and the dark portion 3. Since the temperature in the vacuum vessel 1 is high during the RH vacuum treatment, the refractory in the vacuum vessel 1 in a relatively cool state is particularly black (mainly, the holes of the two dip pipes 2 and the black part of the periphery in the initial visual field range) and is classified into a dark part, as shown in FIG. 1, and thus is also easily distinguished and divided by the image recognition mechanism.
In order to guide the corresponding operation of an RH furnace, the invention provides a regulating and controlling method for RH vacuum treatment, which comprises the following steps: during the process of the RH vacuum treatment,
s1, acquiring an image with a light and shade change part at the bottom of a vacuum tank 1 in real time based on an image recognition mechanism positioned at the top of the vacuum tank 1;
s2, according to the image at each moment, obtaining the area change or the length change of the dark part 3 in the image at the moment;
s3, judging whether the area change or the length change accords with a corresponding first threshold range or not, and starting a cold steel melting process if the area change or the length change accords with the first threshold range; judging whether the steel meets a corresponding second threshold range, and if the steel meets the second threshold range, starting a cold steel melting process; wherein the area change or the length change has a correspondence relation with the extent of the gellan steel with its corresponding threshold range.
The invention discloses a method for opening a cold steel melting process when the cold steel melting process accords with a first threshold range, which means that the cold steel melting process can be considered to be opened when the cold steel melting process accords with the first threshold range, namely, the cold steel melting process can be opened or not, the method can remind technicians of the current cold steel degree, and whether the cold steel melting process is opened or not can be considered according to actual conditions.
The "change in area or change in length of the dark portion 3 in the image" means that the area of the dark portion 3 in the image changes to a certain extent or the length (or converted length) of the dark portion 3 changes to a certain extent according to the difference of the degree of the gellan steel; the area change may be an area change difference, or may be an area after change, and the length change may be a length change difference, or may be a length after change. The dark portion 3 may be the area of all the dark portions 3 in the image, or may be the area of part of the dark portions 3 in the image.
It will be appreciated that the image with the light-dark changing portions means that the image is composed of the light-colored portions 4 and the dark-colored portions 3.
The image recognition mechanism is basically arranged right above the vacuum groove 1, as shown in fig. 1, a part of the periphery of the initial visual field area of the image is dark, and two dark parts 3 in the middle are two holes of the dip pipe 2. The area in the present invention may be a continuous area or a total area of discontinuous portions unless otherwise specified. As the cold steel increases, the dark surrounding portions 3 of the image diffuse inwardly along the arrows in fig. 1, and the area thereof increases. As the number of furnaces for treating molten steel increases, the refractory material of the dip tube 2 is washed out and eroded, and the dark part 3 of the dip tube 2 in the image diffuses outwards along the arrow in fig. 1, and the inner diameter of the dark part is larger.
Based on this, the inventors have further found through a great deal of research that the correspondence between the area change or the length change of the dark portion 3 in the image and the extent of the gellan steel is related, and the system can automatically run the gellan steel processing program according to conditions such as production rhythm, thereby guiding the RH vacuum processing operation. The prior art does not have any judging standard or basis for the degree of the gellan steel, and cannot be expected, because the condition of the gellan steel is complex, the RH vacuum treatment process is continuously changed, the formation of the gellan steel is complex, for example, the density and the quantity of the gellan steel are different, and the bonding degree of the gellan steels in different batches is also different.
Specifically, in the first embodiment, the area of the dark portion 3 in the image is changed to be the ratio Δs of the difference between the area of all the dark portions 3 in the image and the area of the dark portion 3 in which the dip tube 2 is located in the image to the total area of the image. In this solution, the inventors have made extensive studies to characterize the area change according to this Δs, and have found that in some embodiments, the initial area of the dark portion 3 in the image is 21% of the total area of the image, i.e. the initial time Δs is 21%, and as the cold steel grows more and more, the area of the dark portion 3 in the image increases, and when Δs becomes 22-42%, the amount of cold steel is about 0-0.3t; the more the cold steel is, the more the delta S is, the cold steel amount is about 0.4 to 0.5t when the delta S is 43 to 53 percent; when DeltaS is 54-64%, the cold steel amount is about 0.6-0.9t; when DeltaS is 65-74%, the cold steel amount is about 1-1.5t; when DeltaS is 75-95%, the cold steel amount is about 1.6-2.2t. When the delta S meets the first threshold range of 65-74%, the amount of cold steel is large, cold steel can be considered, and when the delta S meets the second threshold range of 75-95%, the cold steel is serious, and the cold steel is necessary to be melted. Thus, in this embodiment, the present invention requires that the first threshold range be 65-74% and the second threshold range be 75-95%.
The Δs can be obtained in any way by a person skilled in the art. In some preferred embodiments, the obtaining, from the image at each moment, the area change of the dark portion 3 in the image at the moment includes:
according to the image at each moment, obtaining the areas of all dark parts 3 in the image at the moment, the areas of the dark parts 3 in the image where the dip tube 2 is positioned and the total area of the image;
and obtaining the ratio delta S of the difference value of the area of all the dark parts 3 in the image and the area of the dark parts 3 in the image of the dip tube 2 to the total area of the image based on the area of all the dark parts 3 in the image, the area of the dark parts 3 in the image of the dip tube 2 and the total area of the image at the moment.
It will be appreciated that as the amount of gellan steel increases, the area of all dark portions 3 in the image includes the surrounding dark portions and the dark portions where the dip tube is located. The total area of the image is summed by the areas of all dark portions 3 and bright portions 4.
In the second embodiment, the area change of the dark portion 3 in the image is the ratio Δa of the total area value at the current time of the dark portion 3 in which the dip tube 2 is located in the image to the total area value at the initial time. In this scheme, according to the Δa, the inventors found through a lot of researches that assuming that the initial total area of the dark portion 3 where the two dip pipes 2 are located is a as shown in fig. 1, as the cold steel is more and more, the total area value at the moment is a portion B not surrounded by the dark portion around, as shown in fig. 2, Δa=b/a, and when Δa is 80-100%, the cold steel amount is about 0-0.4t; when delta A is 61-79%, the cold steel amount is about 0.5-0.9t; when the delta A is 40-60%, the cold steel quantity is about 1-1.5t; when DeltaA is 10-39%, the cold steel amount is about 1.6-2.2t. Thus, in this embodiment, the present invention requires that the first threshold range is 40-60% and the second threshold range is 10-39%.
In some preferred embodiments, the obtaining, from the image at each moment, the area change of the dark portion 3 in the image at the moment includes:
according to the image at each moment, obtaining the total area of the dark part 3 where the dip tube 2 is positioned at the current moment and the total area of the initial moment in the image;
and obtaining the proportion delta A of the total area value of the current time of the dark part 3 of the dip tube 2 in the image to the total area value of the initial time based on the total area of the current time of the dark part 3 of the dip tube 2 in the image and the total area of the initial time.
In a third embodiment, the regulation method further comprises: the image is made square by adjusting the image recognition mechanism, and the length of the dark portion 3 in the image is changed to be the difference Δl between the side length a of the square and the equivalent diameter b of the bright portion 4 in the image. Preferably, the equivalent length is obtained in the following manner: according to the image at each moment, obtaining the equivalent diameter b at the moment of the bright color part 4 in the image and the side length a of the image at the initial moment; based on the current time equivalent diameter b of the bright color portion 4 in the image and the side length a of the image at the initial time, the length variation Δl of all the dark color portions 3 in the image is obtained, where Δl=a-b.
In this scheme, the length change according to the degree of the gellan steel is characterized by the L, and the inventors have found through extensive studies that when Δl=0 to 1.4cm, the amount of the cold steel is about 0 to 0.4t; when DeltaL=1.5-3.4 cm, the cold steel amount is about 0.5-0.6t; when DeltaL=3.5-4.9 cm, the cold steel amount is about 0.7-0.9t; when DeltaL=5-7 cm, the cold steel amount is about 1-1.6t; when Δl=8-9 cm, the amount of cold steel is about 1.7-2.2t. Thus, in this aspect, the invention requires that the first threshold range is 5-7cm and the second threshold range is 8-9cm, where cm is the size unit in the image, i.e. the reference for 1 unit of image division is cm.
In the present invention, the image is square, which means that the image is square as much as possible, or may be square-like.
More preferably, the regulation method further comprises: the image recognition means are adjusted such that the area of the dark part 3 at the initial moment in the image is as small as possible. The preferable scheme can more accurately reflect the change condition of the dark part 3 in the image.
The inventors have further studied and found that the service life of the dip tube 2 is about 70-150 furnaces (typically 80-100 furnaces), i.e. after the 80-100 furnaces are treated with molten steel, the dip tube 2 is too severely eroded to be stopped (i.e. taken off line), the old dip tube 2 is removed, the molten steel can be treated again after the new dip tube 2 is installed (baking is performed before use), and the life of the refractory in the vacuum vessel 1 is longer. For safe and stable production, replacement is required off-line before the dip tube 2 is too severely eroded, however, there is currently no clear solution available for judging the extent of erosion of the dip tube 2. In some preferred embodiments of the invention, the method of modulating further comprises: and obtaining the inner diameter change delta D of the dark part 3 where the dip pipe 2 is positioned in the image at the current moment according to the image at each moment, judging whether the delta D accords with a third threshold range, and if the delta D accords with the third threshold range, severely corroding the dip pipe 2 at the current moment and needing offline replacement. Under the preferred scheme, as the number of furnaces for treating molten steel is increased, the inner diameter of the dip tube 2 is increased (the refractory is washed and eroded), the inner diameter of the dark part 3 where the dip tube 2 is positioned in an image is changed, and the erosion degree of the dip tube 2 is judged by combining the relation between the change degree of the inner diameter and the corresponding threshold range; and the regulating and controlling method based on delta D is reliable, as the central point of the dark part 3 where the dip pipe 2 is positioned can be always observed, if not, the cold steel knots are too much. It will be appreciated that if the dip tube 2 is replaced, a conventional bake is performed prior to the RH vacuum treatment process.
More preferably, the inner diameter variation Δd is an inner diameter difference and the third threshold value is in the range of 6-12cm. In some embodiments, for example, the dip tube 2 inner diameter erodes from the first 500mm to 560-620mm, representing a working layer single-sided refractory brick of 70mm or less, eroded more than 60mm when changed from 130mm to offline.
For the manner of obtaining the inner diameter variation Δd, in some preferred embodiments, the obtaining, from the image at each time, the inner diameter variation Δd of the dark portion 3 where the dip tube 2 is located in the image at the current time includes:
according to the image at each moment, obtaining the real-time inner diameter of the dark part 3 where the dip tube 2 is positioned in the image at the moment and the inner diameter at the initial moment;
based on the real-time inner diameter of the dark portion 3 where the dip tube 2 is located in the image and the inner diameter at the initial time, the inner diameter change DeltaD of the dark portion 3 where the dip tube 2 is located in the image at the current time is obtained.
The inventors have further studied and found that, for the same steel as a whole, the circulation flow rate Q of molten steel in each furnace should be theoretically uniform for each vacuum treatment of molten steel RH, but as the dip tube 2 erodes, the diameter d becomes larger, and the circulation flow rate G is always a certain value, Q becomes larger as d becomes larger in the later stage of life of the dip tube 2, and the molten steel is actually "overstocked". In some preferred embodiments of the invention, the method of modulating further comprises:
based on the real-time inner diameter of the dark part 3 where the dip tube 2 is positioned in the image at the current moment, according to the corresponding relation between the inner diameter d of the dip tube 2 and the circulation flow Q and the circulation flow G, and according to the corresponding relation between the circulation flow G and the high vacuum time t and the circulation flow total quantity M, the circulation flow G or the high vacuum time t required by the vacuum treatment at the current moment RH is obtained;
and carrying out RH vacuum treatment process based on the circulation flow G or the high vacuum time t required by the RH vacuum treatment at the current moment.
In the above preferred embodiment, the flow rate Q of the retaining ring is always constant, and the circulation flow rate G or the high vacuum time t can be regulated and controlled in real time according to the requirement according to the real-time inner diameter d of the dark portion 3 where the dip tube 2 is located in the image; specifically, the method can reduce G along with the enlargement of the real-time monitoring d, so that the circulating argon or nitrogen (generally argon) can be saved; if G is not wanted to be regulated, Q can be kept the same for each furnace steel of the casting time all the time by reducing the time t of the whole high vacuum treatment, so that the saved time can be used for regulating the production rhythm or increasing the soft blowing time of the furnace. Wherein, soft blowing is a technique of reducing ladle bottom blowing flow after vacuum treatment is finished, so that the molten steel surface slightly fluctuates, and the process is favorable for floating removal of inclusions in molten steel, so that the longer the better the longer the steel is.
Wherein, the circulation flow Q (also called circulation rate) is the amount of molten steel passing through the RH degassing chamber per minute. The empirical formula for the loop flow Q is as follows:
Q＝114G 1/3 d 4/3 [Ln(P 0 /P)] 1/3
wherein:
q: ring flow (t/min);
g: circular flow (Nm) 3 /min) (i.e., total flow of the circular argon blowing);
d: the inner diameter (m) of the dip tube 2;
p: pressure in the tank (kPa);
P 0 : atmospheric pressure (kPa).
From the above empirical formula: the ring flow Q is dependent on: circulation air flow G, inner diameter d of dip tube 2, in-tank pressure P, and atmospheric pressure P 0 These four parameters. While for a particular steelworks P, P 0 These two parameters have been basically determined so that if one wants to keep the ring flow Q constant all the time, d increases and G must decrease. Based on this, the above regulation is performed.
The regulation of the high vacuum time t is based on the circulating air circulating total amount m=circulating flow Q, and for the same steel grade (assuming that the molten steel amount per furnace is 130 t), the required M for each furnace molten steel is the same, so that the high vacuum time t can be obtained according to the calculated circulating flow Q based on d, and Q increases with d, so that t is reduced, namely the time t of the whole high vacuum treatment is reduced.
The RH vacuum treatment process is performed based on the circulation airflow G or the high vacuum time t required for the current RH vacuum treatment, which means that the RH vacuum treatment process is performed according to the circulation airflow G or the high vacuum time t required for the current RH vacuum treatment.
The invention is further illustrated below in connection with specific examples.
Example 1
A method of regulating RH vacuum processing, comprising: during the process of the RH vacuum treatment,
based on an image recognition mechanism positioned at the top of the vacuum tank 1, obtaining an image with a light and shade change part at the bottom of the vacuum tank 1 in real time;
according to the image at each moment, obtaining the real-time inner diameter d of the dark part 3 where the dip tube 2 is positioned in the image at the moment;
based on the real-time inner diameter d of the dark part 3 where the dipping tube 2 is positioned in the image at the current moment, circulating air according to the dipping tube 2d and the annular flow QCorrespondence of flow rate G (q=114G 1/3 d 4/3 [Ln(P 0 /P)] 1/3 ) And obtaining the high vacuum time t required by the vacuum treatment at the current moment RH according to the corresponding relation (M=Q×t) between the circulation air flow G and the high vacuum time t and the circulation air circulation total amount M.
And carrying out an RH vacuum treatment process based on the high vacuum time t required by the RH vacuum treatment at the current moment.
Wherein the inner diameter of the new dip tube 2 is 0.5m. The vacuum degree P was found to be 0.266kPa, and the constant circulation flow rate G was determined to be 55Nm 3 And/h, the required circulation flow Q is 79.6t/min. The high vacuum time was 15min and the total circulating gas circulation M was 79.6x15=1194t.
Example 2
The procedure of example 1 was followed, except that the dip tube 2 was eroded so that d was 0.55m, and then the required circulation flow rate Q was 90.4t/min. To achieve the same total cycle, the high vacuum time t required for regulation was 1194/90.4=13.2 min, a 1.8min reduction compared to example 1.
Example 3
The procedure of example 1 was followed, except that the dip tube 2 was eroded so that d was 0.6m, and then the required circulation flow rate Q was 101.5t/min. To achieve the same total cycle, the high vacuum time t required for regulation was 1194/101.5=11.7 min, 3.3min shorter than in example 1.
According to the embodiment, the high vacuum time can be shortened by adopting the regulating method of the invention, and the high vacuum time can be used for regulating the production rhythm or increasing the soft blowing time. Similarly, if the high vacuum time is not required to be shortened, the circulation gas flow rate G can be reduced and gas can be saved while the circulation flow rate Q is kept constant.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of the individual technical features in any other suitable way, which simple variants and combinations should likewise be regarded as being disclosed by the invention, all falling within the scope of protection of the invention.
Claims (7)
1. A method for controlling RH vacuum processing, comprising: during the process of the RH vacuum treatment,
based on an image recognition mechanism positioned at the top of the vacuum tank, acquiring an image with a brightness change part at the bottom of the vacuum tank in real time;
obtaining the area change of a dark part in the image at the current moment according to the image at each moment;
judging whether the area change accords with a corresponding first threshold range or not based on the area change, and starting or not starting a cold steel melting process if the area change accords with the first threshold range; judging whether the steel meets a corresponding second threshold range, and if the steel meets the second threshold range, starting a cold steel melting process; wherein the area change and the corresponding threshold range have a corresponding relation related to the degree of the gellan steel;
the area change of the dark part in the image is the ratio delta S of the difference value of the area of all the dark parts in the image and the area of the dark part where the dip pipe is positioned in the image to the total area of the image, the first threshold range is 65-74%, and the second threshold range is 75-95%; or the area change of the dark part in the image is the ratio delta A of the total area value of the current moment of the dark part of the dip pipe in the image to the total area value of the initial moment, the first threshold range is 40-60%, and the second threshold range is 10-39%.
2. The method according to claim 1, wherein when the area change of the dark portion in the image is Δs, the obtaining the area change of the dark portion in the image at the present time from the image at each time includes:
obtaining all dark part areas in the image, the dark part area where the dip tube is positioned in the image and the total area of the image at the current moment according to the image at each moment;
and obtaining the ratio delta S of the difference value of the areas of all the dark parts in the image and the area of the dark parts in the image to the total area of the image based on the areas of all the dark parts in the image, the area of the dark parts in the image and the total area of the image at the moment.
3. The method according to claim 1, wherein when the area of the dark portion in the image changes to Δa, the step of obtaining the area change of the dark portion in the image at the current time from the image at each time includes:
according to the image at each moment, obtaining the total area of the dark part of the dip tube in the image at the current moment and the total area of the dip tube at the initial moment;
and obtaining the proportion delta A of the total area value of the current time of the dark part of the dip tube in the image to the total area value of the initial time based on the total area of the current time and the total area of the initial time of the dark part of the dip tube in the image.
4. A method of modulating according to any one of claims 1-3, further comprising:
and obtaining the inner diameter change delta D of the dark part where the dip pipe is positioned in the image at the current moment according to the image at each moment, judging whether the delta D accords with a third threshold range, and if the delta D accords with the third threshold range, severely corroding the dip pipe at the current moment and needing to be replaced off line.
5. The method according to claim 4, wherein the inner diameter change Δd is an inner diameter difference, and the third threshold value is in the range of 6 to 12cm.
6. The method according to claim 4, wherein the step of obtaining the change Δd of the inner diameter of the dark portion of the dip tube in the image at the current time based on the image at each time comprises:
according to the image at each moment, obtaining the real-time inner diameter of the dark part where the dip pipe is positioned in the image at the current moment and the inner diameter at the initial moment;
and obtaining the inner diameter change delta D of the dark part of the dip pipe in the image at the current moment based on the real-time inner diameter of the dark part of the dip pipe in the image and the inner diameter at the initial moment.
7. The method of claim 5, further comprising:
based on the real-time inner diameter of the dark part where the dip pipe is located in the image at the current moment, according to the corresponding relation between the inner diameter d of the dip pipe and the circulation flow Q and the circulation flow G, and according to the corresponding relation between the circulation flow G and the high vacuum time t and the circulation flow total amount M, the circulation flow G or the high vacuum time t required by the vacuum treatment at the current moment RH is obtained;
and carrying out RH vacuum treatment process based on the circulation flow G or the high vacuum time t required by the RH vacuum treatment at the current moment.
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| CN106011386B (en) * | 2016-06-21 | 2018-06-29 | 首钢京唐钢铁联合有限责任公司 | A kind of control method of RH top guns smelting cold steel |
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| US10761035B2 (en) * | 2017-02-27 | 2020-09-01 | Nippon Steel Corporation | Diagnosis support apparatus, diagnosis support method, diagnosis method, and repair method of vacuum degassing tank |
| CN110819768B (en) * | 2019-11-20 | 2021-11-09 | 马鞍山钢铁股份有限公司 | Method for improving RH vacuum grooving cold steel efficiency for low-carbon aluminum killed steel |
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