Control method for improving continuous casting self-opening rate
By laying a silicon carbide covering layer on the surface of the sprue sand and using a self-opening risk prediction model, the problem of cold steel forming at the tapping nozzle due to low converter tapping temperature was solved, thereby improving the self-opening rate of continuous casting and production stability, and ensuring the quality of the cast billet.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
- Filing Date
- 2025-12-23
- Publication Date
- 2026-04-10
AI Technical Summary
Existing technologies are insufficient to effectively improve the self-opening rate of continuous casting, especially when the converter tapping temperature is low, cold steel is prone to form at the nozzle, leading to self-opening failure and affecting production continuity and product quality.
By laying a silicon carbide covering layer on the surface of the guide sand and combining it with the self-opening risk prediction model of LSTM neural network, the amount of guide sand and silicon carbide used is optimized to form a dense protective layer, avoiding direct contact between molten steel and steel flow, controlling the steel flow rate and argon gas stirring, and achieving self-opening without intervention.
It significantly improves the self-opening rate of continuous casting, reduces the occurrence of cold steel buildup at the nozzle, ensures production continuity and the internal quality of the billet, avoids the problems of secondary oxidation of molten steel and increased inclusions in traditional methods, and is easy to operate without the need for additional adjustments to the smelting process.
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Figure CN121820575A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the technical field of steel plants, in particular to a control method for improving continuous casting self-opening rate. BACKGROUND
[0002] A steel plant is an industrial facility specializing in iron ore processing and steel production, and its core task is to convert natural iron ore into high-quality steel. The continuous casting self-opening rate is a core indicator in the continuous casting process, which refers to the frequency or proportion of the ladle automatically opening during the continuous casting process. The continuous casting self-opening rate reflects the stability and efficiency of the ladle automatically opening during the continuous casting operation. A high self-opening rate can ensure that the molten steel flows smoothly into the crystallizer, avoid the flow of liquid slag in the tundish into the casting blank, thereby reducing the casting blank reconnection, downtime accidents, and ensuring the continuity of production and product quality. The current continuous casting self-opening rate of 120-ton ladles nationwide is generally around 99%. Due to factors such as steel grade and iron consumption, the existing continuous casting self-opening rate is difficult to improve by improving the material quality of the drainage sand. Moreover, the temperature of the molten steel discharged from the converter cannot be increased in many cases. The low temperature at the bottom of the ladle leads to the formation of cold steel around the water gap. The cold steel around the water gap of the ladle is difficult to completely melt in subsequent smelting, which is a relatively important reason for oxygen burning, especially for molten steel with short refining time. SUMMARY
[0003] The present application is made in view of the above problems, and aims to provide a control method for improving the continuous casting self-opening rate to solve the problems raised in the background art. To achieve the above-mentioned purpose, the present application provides the following technical scheme: a control method for improving the continuous casting self-opening rate, comprising the following steps: S1, ladle pretreatment During the hot repair of the ladle, the residual steel, slag, and magnesium fire mud in the water gap are thoroughly cleaned to ensure that the water gap is unobstructed and free of debris. S2, self-opening risk prediction model construction A continuous casting self-opening control system is built to collect key parameter data in real time, and a risk prediction model is constructed based on an LSTM neural network. The model is input with 3000 furnace data to obtain the self-opening risk prediction model. S3, drainage sand laying The ladle is baked to an inner lining temperature of 820 DEG C or higher. The sanding operation is completed within 30 minutes after stopping the baking to avoid rapid cooling of the ladle. Mechanical sanding or funnel sanding is used to add a predetermined amount of drainage sand to the water gap to ensure that the sand body is full and free of segregation and voids. The sand body is naturally settled and densified for 5 minutes. The water content and particle size detection results of the drainage sand are input into the self-opening risk prediction model, and the risk coefficient of the self-opening risk prediction model is updated. S4, silicon carbide cover layer laying After the quicksand settlement is completed, the system determines whether silicon carbide needs to be added according to the real-time risk coefficient of the self-opening risk prediction model. When adding, a corresponding amount of silicon carbide is uniformly spread on the surface of the quicksand through a special feeding device to form a complete cover layer, avoid local exposure, and gently operate during the laying process to prevent impact from causing the quicksand layer to loosen or the silicon carbide to separate, ensuring that the cover layer is tightly attached to the quicksand without obvious gaps.
[0004] S5, converter tapping 10 minutes before tapping, confirm the ladle in place, adjust the position of the ladle to make the horizontal distance between the nozzle center and the converter tapping port ≥ 30 cm, and ensure that the steel flow is offset from directly above the nozzle.
[0005] During converter tapping, control the steel flow speed to be 1.5-2.0 t / min to avoid high-speed steel flow impact, and the steel flow falls into the ladle in an umbrella shape, without directly washing the silicon carbide cover layer and quicksand in the nozzle area. At the same time, the system collects real-time steel flow speed and shape data. When the steel flow speed deviates from the range of 1.5-2.0 t / min, it automatically feeds back to the converter control system to adjust the tapping rhythm. When the steel flow shows a trend of deviating towards the nozzle, an audible and light alarm is triggered immediately, and adjustment suggestions are pushed.
[0006] Further, the following steps are further included: S6, tapping after opening After tapping is completed, the system automatically records the steel flow washing situation, while maintaining an argon stirring flow of 120-160 L / min for 5-8 minutes to ensure uniform steel temperature and composition, while avoiding excessive argon flow that causes the cover layer to loosen; and shortening the ladle turnaround time, ≤180 min from tapping to continuous casting opening.
[0007] Further, the following steps are further included: S7, model iteration After each heat is completed, the system automatically enters the self-opening results and abnormal data, and iterates and optimizes the model every week to continuously reduce the misjudgment rate.
[0008] Further, in step S4, when laying silicon carbide, the system monitors the surface temperature of the ladle in real time through an infrared thermometer. When the temperature is ≥ 850℃, it automatically reminds the operator to strengthen protection. During the tapping process, when personnel are within ≤5 meters of the nozzle area, a safety warning is triggered.
[0009] Further, in step S4, during the laying of silicon carbide, the system links the camera to monitor the uniformity of the cover, avoiding local exposure, and automatically alarms if abnormalities are found.
[0010] Furthermore, in step S4, after the silicon carbide is laid, if the ladle needs to wait for steel to be tapped, the maximum waiting time is no more than 30 minutes. A small amount of argon gas can be introduced into the ladle at a rate of 5-10 L / min to prevent air from entering and causing silicon carbide oxidation, while also avoiding excessive argon gas flow that could blow away the covering layer.
[0011] Furthermore, in step S5, during the tapping process, the state of the steel flow is observed in real time. If the steel flow deviates towards the nozzle, the ladle position or the tapping angle of the converter is immediately adjusted to ensure that the steel flow does not come into contact with the covering layer and the guide sand above the nozzle throughout the entire process.
[0012] Furthermore, in step S6, before continuous casting begins, the argon gas stirring is turned off for 30 seconds. When opening the sprue slide, the operation is slow, with an opening speed ≤0.5cm / s, to avoid the instantaneous impact of molten steel causing the covering layer to fall off. The state of the steel flow is observed. If a slight blockage occurs, a small amount of argon gas can be briefly introduced to assist in guiding the flow at a rate of 10-15L / min. Direct oxygen burning is prohibited.
[0013] Furthermore, in step S6, if the steel tapping waiting time exceeds 30 minutes, the sprue area needs to be re-inspected. If the silicon carbide coating is found to be damaged, 1-2 kg of silicon carbide should be added for repair.
[0014] Furthermore, in step S7, if an automatic opening failure occurs, the system automatically retrieves all process data, generates an anomaly analysis report, and pushes targeted adjustment suggestions.
[0015] Compared with the prior art, the present invention has the following beneficial effects: This method for improving the self-opening rate of continuous casting involves precisely covering the surface of the guide sand with silicon carbide. Even at low converter tapping temperatures, it significantly reduces the formation of cold steel at the nozzle, requiring no additional adjustments to the smelting process. The reliability of self-opening is improved simply through this covering operation, making it highly convenient to operate. Because silicon carbide has a melting point above 2700℃ and extremely poor wettability with molten steel, the dense protective layer formed on the guide sand surface effectively prevents direct contact between molten steel and the guide sand, avoiding rapid heat dissipation and the formation of a thick layer of cold steel. After implementation, the thickness of the cold steel at the nozzle is reduced, completely eliminating the problem of cold steel clogging the nozzle and achieving successful self-opening on the first attempt without the need for oxygen cleaning. Furthermore, the silicon carbide coating not only prevents molten steel from penetrating into the guide sand, but its granular structure also enhances the overall stability of the sand, preventing the guide sand from loosening and being lost due to the impact of the steel flow and argon agitation. At the same time, silicon carbide reacts with molten steel to produce a deoxidation reaction and generates a large amount of heat, thus preventing the formation of cold steel. In addition, compared with the problems of secondary oxidation of molten steel and increased inclusions that may be caused by traditional oxygen-fired casting, silicon carbide coating achieves non-interventional self-opening through physical isolation, further ensuring the internal quality of the billet. Moreover, this application also incorporates a self-opening risk prediction model, which can fine-tune the amount of silicon carbide according to the risk coefficient to maximize the protective effect of the silicon carbide coating. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this drawing or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this drawing. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0017] Figure 1 This is a flowchart illustrating the steps of a method for controlling the self-opening rate of continuous casting according to the present invention. Figure 2 This is a schematic diagram comparing the experimental results of the present invention with those of the prior art. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following description and illustration are provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.
[0019] Obviously, the following description is merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios without any inventive effort. Furthermore, it is understood that although the effort involved in such development may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.
[0020] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.
[0021] Unless otherwise specified, the term "or" is inclusive in this application. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, the condition "A or B" is satisfied by any of the following conditions: A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).
[0022] Terminology explanation: such asFigure 1 As shown, the present invention provides a technical solution: a method for controlling the self-opening rate of continuous casting, comprising the following steps: S1. Ladle Pretreatment During hot repair of the ladle, thoroughly clean the residual steel, slag and magnesium molten metal residue inside the nozzle to ensure that the nozzle passage is unobstructed and free of debris. S2, Construction of Self-Opening Risk Prediction Model A continuous casting automatic start-up control system was built, key parameter data were collected in real time, and a risk prediction model was constructed based on LSTM neural network. The automatic start-up risk prediction model was obtained by inputting 3,000 historical heats of data. S3, Diversion Sand Laying The ladle should be baked until the inner lining temperature is ≥820℃. After baking is stopped, sand should be added within 30 minutes to prevent the ladle from cooling down too quickly. Use mechanical sand addition or funnel sand addition to add a preset amount of diversion sand into the water inlet to ensure that the sand body is fully filled without voids or segregation, and let it stand for 5 minutes to allow the sand body to settle and compact naturally. The results of the moisture content and particle size test of the diversion sand are entered into the self-opening risk prediction model, and the risk coefficient of the self-opening risk prediction model is updated. S4, Silicon carbide capping layer laying After the quicksand settles, the system determines whether silicon carbide needs to be added based on the real-time risk coefficient of the self-developed risk prediction model. When adding silicon carbide, a special feeding device is used to evenly spread the corresponding amount of silicon carbide on the surface of the diversion sand to form a complete covering layer, avoiding local exposure. During the laying process, the operation is gentle to prevent impact from causing the diversion sand layer to loosen or the silicon carbide to delaminate, ensuring that the covering layer is tightly attached to the diversion sand without obvious gaps.
[0023] During silicon carbide laying, the system monitors the ladle surface temperature in real time using an infrared thermometer. When the temperature is ≥850℃, it automatically reminds operators to strengthen protection. During the tapping process, a safety warning is triggered when personnel are ≤5 meters away from the tapping area. During the silicon carbide laying process, the system links with cameras to monitor the uniformity of coverage, avoid local exposure, and automatically alarms when abnormalities are detected. After the silicon carbide layer is laid, if the ladle needs to wait for steel to be tapped (no more than 30 minutes), a small amount of argon gas can be introduced into the ladle at a rate of 5-10 L / min. This prevents air from entering and causing oxidation of the silicon carbide, while also avoiding excessive argon flow that could blow away the covering layer. If the wait is ≤15 minutes: Argon flow rate 5-8 L / min;
[0024] If waiting for 15-30 minutes: Argon flow rate 8-10L / min, and automatic reminder to check the cover layer status every 5 minutes; S5, Converter tapping 10 minutes before tapping, confirm that the ladle is in place and adjust its position so that the horizontal distance between the center of the tap and the converter tap is ≥30cm, ensuring that the steel flow is not directly above the tap.
[0025] When tapping steel from the converter, the steel flow rate should be controlled at 1.5-2.0 t / min to avoid high-speed steel flow impact. The steel flow should fall into the ladle in an umbrella shape and should not directly wash the silicon carbide covering layer and the guide sand in the nozzle area. During the tapping process, the steel flow status is observed in real time. If the steel flow deviates towards the nozzle, the ladle position or the tapping angle of the converter is adjusted immediately to ensure that the steel flow does not come into contact with the covering layer and diversion sand above the nozzle throughout the entire process. Meanwhile, the system collects steel flow velocity and shape data in real time. When the steel flow velocity deviates from the range of 1.5-2.0 t / min, it automatically feeds back to the converter control system to adjust the tapping rhythm. When the steel flow shows a tendency to deviate towards the nozzle, it immediately triggers an audible and visual alarm and pushes adjustment suggestions. S6. Casting begins after tapping. After tapping, the system automatically records the scouring of the steel flow while maintaining an argon gas stirring flow rate of 120-160 L / min for 5-8 minutes to ensure uniform steel temperature and composition, while avoiding excessive argon gas flow that could loosen the capping layer. It also shortens the ladle turnaround time, ensuring that the time from tapping to continuous casting starts is ≤180 minutes. If the tapping waiting time exceeds 30 minutes, the nozzle area must be re-inspected. If damage to the silicon carbide capping layer is found, 1-2 kg of silicon carbide should be added for repair. Before continuous casting begins, turn off the argon gas stirring for 30 seconds. When opening the sprue slide, operate slowly with an opening speed ≤0.5cm / s to avoid the instantaneous impact of molten steel causing the covering layer to fall off. Observe the steel flow status. If slight blockage occurs, a small amount of argon gas can be briefly introduced to assist in guiding the flow at a rate of 10-15L / min. Direct oxygen burning is prohibited. S7, Model Iteration After each furnace cycle, the system automatically records the self-starting results and abnormal data, and iterates and optimizes the model weekly to continuously reduce the false judgment rate. If the automatic startup fails, the system will automatically retrieve all process data, generate an anomaly analysis report, and push targeted adjustment suggestions.
[0026] Example:
[0027] Clean the inside of the nozzle of residual steel and slag (residue from the previous furnace), thoroughly remove the magnesia mud adhering to the inner wall of the nozzle with a wire brush, and check that the nozzle channel is unobstructed to ensure that it is unobstructed. Because the temperature of the ladle lining was 810℃, which was lower than 820℃, the temperature compensation program was initiated, extending the baking time by 15 minutes. The baking was finally stopped after the lining temperature rose to 830℃.
[0028] Within 20 minutes after the baking is stopped, 12 kg of chromium-containing diversion sand is added into the sprue using a mechanical sand-adding device. During the sand-adding process, the device is kept vertical to ensure that the sand body is fully filled in a "bun" shape without any gaps or segregation. Let it stand for 5 minutes to allow the sand body to settle and compact naturally. After settling, the sand surface is about 3 cm away from the top of the sprue. Insert the guide pipe of the special feeding funnel 12cm above the water inlet and slowly pour in 5kg of silicon carbide, spreading it evenly around the circumference of the sand body to ensure that there are no exposed areas in the cover layer. The actual thickness is approximately 6mm. After laying, gently touch the surface of the cover layer with a long-handled tool to confirm that the silicon carbide is tightly bonded to the guiding sand without obvious gaps or delamination, in order to prevent it from falling off due to subsequent impact from molten steel. Because the ladle needs to wait for steel to be tapped, the estimated waiting time is 25 minutes. Start the argon gas branch at the bottom of the ladle and introduce a small amount of argon gas (flow rate 6 L / min) to prevent air from entering and causing silicon carbide oxidation, while also avoiding excessive flow that could blow away the covering layer. Ten minutes before tapping, adjust the ladle position so that the horizontal distance between the center of the tundish nozzle and the converter tapping opening is 35 cm. When tapping from the converter, the initial steel flow rate is controlled at 1.5 t / min. Once the molten steel level in the ladle reaches one-third of its height, adjust it to 1.8 t / min. The steel flow should fall in an umbrella shape onto one side of the ladle, avoiding the area directly above the tundish nozzle. After tapping, the total amount of molten steel was 120 tons. The argon gas flow rate was adjusted to 140 L / min, and the stirring time was 7 minutes to ensure that the temperature and composition of the molten steel were uniform and that the coating did not loosen or fall off during the stirring process. The time from tapping to continuous casting should be controlled at 120 minutes. Argon gas stirring should be turned off 30 minutes before casting begins, and the nozzle area should be checked for any damage or loss of silicon carbide.
[0029] When opening the sprue slide at the start of casting, open it slowly at a speed of 0.4 cm / s. Observe that the steel flow is smooth and there is no blockage. No auxiliary argon gas needs to be introduced. The sprue opens successfully on its own.
[0030] In the above embodiments, a comparative experiment was conducted between the method of the present invention and a traditional method. The experimental comparison results are as follows: Figure 2 As shown, in the existing technology, when the converter tapping temperature or ladle temperature is low during the continuous casting process, the molten steel temperature at the ladle wall is the lowest. If the molten steel temperature is below the liquidus line, it will solidify and form cold steel on the ladle wall. The guide sand at the nozzle has a low temperature and is the easiest place for cold steel to form first. This position is also the part least affected by the argon flow field in subsequent smelting. Therefore, once cold steel forms and reaches a certain thickness, subsequent smelting will not be able to completely melt it. This invention effectively prevents the formation of cold steel or reduces the thickness of cold steel by adding a layer of silicon carbide to the surface of the molten steel. This is because silicon carbide will immediately undergo a deoxidation reaction after contacting molten steel, generating gas and a large amount of heat, increasing the fluidity and heat energy of the molten steel, and effectively reducing the formation of cold steel at the sprue. Based on the comparison results, the failure rate of continuous casting self-opening in the existing technology is relatively high. Before the steel is tapped from the converter, the present invention adds guiding sand into the ladle and then adds a layer of silicon carbide on the surface. The subsequent smelting is carried out according to the normal process, which can effectively improve the situation of oxygen burning caused by cold steel forming at the ladle nozzle. In particular, for low phosphorus steel and other special steels, the self-opening rate of continuous casting can be greatly improved when the converter tapping temperature is low.
[0031] Based on the above description, this invention precisely covers the surface of the guide sand with silicon carbide. Even at low converter tapping temperatures, it can significantly reduce the formation of cold steel at the nozzle, without requiring additional adjustments to the smelting process. The reliability of self-opening is improved simply through a covering operation, offering high operational convenience. Because silicon carbide has a melting point above 2700℃ and extremely poor wettability with molten steel, the formation of a dense protective layer on the guide sand surface effectively prevents direct contact between molten steel and the guide sand, avoiding rapid heat dissipation and the formation of a thick layer of cold steel. After implementation, the thickness of the cold steel at the nozzle is reduced, completely eliminating the problem of cold steel clogging the nozzle and achieving successful self-opening on the first attempt without the need for oxygen cleaning. Furthermore, silicon carbide... The silicon carbide coating not only prevents molten steel from penetrating into the guide sand, but its granular structure also enhances the overall stability of the sand, preventing the guide sand from loosening and being lost due to the impact of the steel flow and argon agitation. At the same time, silicon carbide reacts with molten steel to produce a deoxidation reaction and generates a large amount of heat, thus preventing the formation of cold steel. In addition, compared with the problems of secondary oxidation of molten steel and increased inclusions that may be caused by traditional oxygen-fired casting, silicon carbide coating achieves non-interventional self-opening through physical isolation, further ensuring the internal quality of the billet. Furthermore, this application also incorporates a self-opening risk prediction model, which can fine-tune the amount of silicon carbide according to the risk coefficient to maximize the protective effect of the silicon carbide coating.
[0032] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.
Claims
1. A method for controlling the self-opening rate of continuous casting, characterized in that, Includes the following steps: S1. Ladle Pretreatment During hot repair of the ladle, thoroughly clean the residual steel, slag and magnesium molten metal residue inside the nozzle to ensure that the nozzle passage is unobstructed and free of debris. S2, Construction of Self-Opening Risk Prediction Model A continuous casting automatic start-up control system was built, key parameter data were collected in real time, and a risk prediction model was constructed based on LSTM neural network. The automatic start-up risk prediction model was obtained by inputting 3,000 historical heats of data. S3, Diversion Sand Laying The ladle should be baked until the inner lining temperature is ≥820℃. After baking is stopped, sand should be added within 30 minutes to prevent the ladle from cooling down too quickly. Use mechanical sand addition or funnel sand addition to add a preset amount of diversion sand into the water inlet to ensure that the sand body is fully filled without voids or segregation, and let it stand for 5 minutes to allow the sand body to settle and compact naturally. The results of the moisture content and particle size test of the diversion sand are entered into the self-opening risk prediction model, and the risk coefficient of the self-opening risk prediction model is updated. S4, Silicon carbide capping layer laying After the quicksand settles, the system determines whether silicon carbide needs to be added based on the real-time risk coefficient of the self-developed risk prediction model. When adding silicon carbide, a special feeding device is used to evenly spread the corresponding amount of silicon carbide on the surface of the diversion sand to form a complete covering layer, avoiding local exposure. During the laying process, the operation is gentle to prevent impact from causing the diversion sand layer to loosen or the silicon carbide to delaminate, ensuring that the covering layer is tightly attached to the diversion sand without obvious gaps. S5, Converter tapping 10 minutes before tapping, confirm that the ladle is in place and adjust its position so that the horizontal distance between the center of the tap and the converter tap is ≥30cm, ensuring that the steel flow is not directly above the tap. When tapping steel from the converter, the steel flow rate should be controlled at 1.5-2.0 t / min to avoid high-speed steel flow impact. The steel flow should fall into the ladle in an umbrella shape and should not directly wash the silicon carbide covering layer and the guide sand in the nozzle area. Meanwhile, the system collects steel flow velocity and shape data in real time. When the steel flow velocity deviates from the range of 1.5-2.0 t / min, it automatically feeds back to the converter control system to adjust the tapping rhythm. When the steel flow shows a tendency to deviate towards the nozzle, it immediately triggers an audible and visual alarm and pushes adjustment suggestions.
2. The method for controlling the self-opening rate of continuous casting according to claim 1, characterized in that, It also includes the following steps: S6. Casting begins after tapping. After tapping, the system automatically records the scouring of the steel flow, while maintaining an argon gas stirring flow rate of 120-160 L / min and a stirring time of 5-8 minutes to ensure uniform steel temperature and composition, while avoiding excessive argon gas flow that could loosen the covering layer; and shortening the ladle turnaround time, with the time from tapping to continuous casting start ≤180 min.
3. The control method for improving the self-opening rate of continuous casting according to claim 2, characterized in that, It also includes the following steps: S7, Model Iteration After each furnace cycle, the system automatically records the self-starting results and abnormal data, and iterates and optimizes the model weekly to continuously reduce the misjudgment rate.
4. The control method for improving the self-opening rate of continuous casting according to claim 1, characterized in that: In step S4, during silicon carbide laying, the system monitors the ladle surface temperature in real time using an infrared thermometer. When the temperature is ≥850℃, it automatically reminds the operator to strengthen protection. During the tapping process, when personnel are ≤5 meters away from the tapping area, a safety warning is triggered.
5. The control method for improving the self-opening rate of continuous casting according to claim 1, characterized in that: In step S4, during the silicon carbide laying process, the system uses a linked camera to monitor the uniformity of coverage, avoid local exposure, and automatically alarm when an abnormality is detected.
6. The control method for improving the self-opening rate of continuous casting according to claim 1, characterized in that: In step S4, after the silicon carbide is laid, if the ladle needs to wait for steel to be tapped, the maximum waiting time is no more than 30 minutes. A small amount of argon gas can be introduced into the ladle at a rate of 5-10 L / min to prevent air from entering and causing silicon carbide oxidation, while also avoiding excessive argon gas flow that could blow away the covering layer.
7. The control method for improving the self-opening rate of continuous casting according to claim 1, characterized in that: In step S5, during the tapping process, the state of the steel flow is observed in real time. If the steel flow deviates towards the nozzle, the ladle position or the tapping angle of the converter is immediately adjusted to ensure that the steel flow does not come into contact with the covering layer and the guide sand above the nozzle throughout the entire process.
8. The control method for improving the self-opening rate of continuous casting according to claim 2, characterized in that: In step S6, before continuous casting begins, the argon gas stirring is turned off for 30 seconds. When opening the sprue slide, the operation is slow, with an opening speed ≤0.5cm / s, to avoid the instantaneous impact of molten steel causing the covering layer to fall off. The state of the steel flow is observed. If a slight blockage occurs, a small amount of argon gas can be briefly introduced to assist in guiding the flow at a rate of 10-15L / min. Direct oxygen burning is prohibited.
9. The control method for improving the self-opening rate of continuous casting according to claim 2, characterized in that: In step S6, if the steel tapping waiting time exceeds 30 minutes, the tapping nozzle area needs to be re-inspected. If the silicon carbide coating is found to be damaged, 1-2 kg of silicon carbide should be added for repair.
10. The control method for improving the self-opening rate of continuous casting according to claim 3, characterized in that: In step S7, if the automatic opening fails, the system automatically retrieves the full process data, generates an anomaly analysis report, and pushes targeted adjustment suggestions.