Control system for keeping tonnage stability of tundish

Abstract

The invention discloses a control system for keeping tundish tonnage stability, which comprises a data entry module, a monitoring module, a judgment module and a molten steel outflow module, and is characterized in that the data entry module records the tonnage of a tundish, the monitoring module reads the tonnage of the tundish in real time, and the judgment module compares the tonnage of the tundish with preset data to determine the tonnage of the tundish; the molten steel outflow module controls the outflow amount of molten steel based on the result of the judgment module; the PLC system outputs signals and can control the closure sliding plate to adjust the opening degree of the sliding nozzle through the oil cylinder, tundish tonnage control is achieved, the PLC system can not only be in seamless joint with an existing mechanical mechanism, but also be optimized and adjusted according to the specific characteristics of the mechanical mechanism, the adaptability can ensure the operation efficiency and stability of mechanical equipment, and the adaptability is high. The solution has remarkable advantages in the aspects of improving the molten steel processing efficiency, reducing the operation cost or improving the product quality and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of molten steel processing, and particularly to a control system for maintaining the stability of tundish tonnage. Background Art

[0002] The stability of the tundish during continuous casting is of great significance for ensuring the efficient operation of the continuous caster and the quality of the cast billet. Ensuring the quality of the cast billet: The stability of the tundish directly affects the surface and internal quality of the cast billet. Through precise and highly stable dynamic control technology of the cast billet temperature, precise process control can be achieved, where the temperature of the cast billet decreases smoothly and slowly longitudinally and cools evenly laterally, thereby significantly improving the surface and internal quality of the cast billet. Improving production efficiency: The stability of the tundish can reduce production interruptions caused by equipment failures or operational errors, thereby increasing the operating rate and production efficiency of the continuous caster. Reducing production costs: By improving the stability of the tundish, the service life of the tundish can be extended, the frequency of tundish replacement can be reduced, thereby reducing refractory costs and the consumption of steel materials in production. Optimizing production operations: The stability of the tundish helps to smoothly carry out multi-hearth continuous casting, expand the variety of continuous casting, increase the continuous casting ratio, improve the operating rate of the caster, and optimize the production operation process. Improving the temperature uniformity of molten steel: The tundish can store molten steel and ensure the uniform temperature of the molten steel, providing a stable supply of molten steel for continuous casting. Promoting metallurgical effects: As a refining reactor, the tundish has metallurgical functions including removing the sources of recontamination of molten steel, improving the flow conditions of molten steel, reducing inclusions, thereby enhancing the metallurgical quality of the cast billet. Improving the purity of molten steel: Through tundish metallurgy technology, non-metallic inclusions in molten steel can be reduced, and the purity of molten steel can be improved, which is particularly important for the production of high-quality steel grades. Supporting the development of high-end varieties: The development of high-end variety steels places higher requirements on the stability and control accuracy of the continuous casting process, and the stability of the tundish is one of the key factors to achieve these requirements.

[0003] In related technologies, when the control of tundish tonnage mainly relies on manual regulation, under interference conditions such as casting speed fluctuations, there are problems such as low effectiveness and poor stability. When manually adjusting the opening degree of the ladle nozzle, it is difficult to precisely control the speed of molten steel entering the tundish and the liquid level height, resulting in unstable tundish liquid level. Under interference conditions such as casting speed fluctuations, the response speed of manual operation is much lower than that of an automated control system, and the tundish liquid level height cannot be adjusted in a timely manner. Due to different experiences and judgment abilities of different operators, there may be significant differences in the control effect of the tundish liquid level. Summary of the Invention

[0004] The purpose of the present invention is to provide a control system for maintaining the stability of tundish tonnage to solve the problems raised in the above background art.

[0005] To achieve the above object, the present invention provides the following technical solution: A control system for maintaining the stability of the tundish tonnage, including a data entry module, the data entry module records the tonnage of the tundish, and the data entry module records the tonnage A of the current tundish and the tonnage A1 of the previous tundish; A monitoring module, the monitoring module reads the tonnage of the tundish in real time, and the tonnage sensor reads the tonnage of the tundish every 0.2 seconds to achieve real-time monitoring; A judgment module, the judgment module compares the tonnage of the tundish with preset data; A molten steel outflow module, the molten steel outflow module controls the outflow rate of molten steel based on the result of the judgment module; Several groups of preset data are set, and the preset data is set based on the tonnage of the tundish. The data entry module, the monitoring module, the judgment module, and the preset data form a PLC system. The PLC system controls the action of the molten steel outflow module to adjust the outflow rate of molten steel to maintain the tundish tonnage within a set range.

[0006] Further, the judgment module includes Judgment One, Judgment Two, Judgment Three, and Judgment Four; Judgment One judges whether A is less than or equal to A1 and less than or equal to 44.8: Check whether the current tundish tonnage A is less than or equal to the previous tonnage A1 and less than or equal to 44.8. If not, jump to Judgment Two; Judgment Two judges whether A1 is less than or equal to A and less than or equal to 44.8: Check whether the previous tundish tonnage A1 is less than or equal to the current tonnage A and less than or equal to 44.8. If not, jump to Judgment Three; Judgment Three judges whether A is greater than or equal to A1 and greater than or equal to 45.2: Check whether the current tundish tonnage A is greater than or equal to the previous tonnage A1 and greater than or equal to 45.2. If not, jump to Judgment Four; Judgment Four judges whether 45.2 is less than or equal to A and less than or equal to A1: Check whether the current tundish tonnage A is between 45.2 and the previous tonnage A1. If not, return to the step of reading the tundish tonnage.

[0007] Further, the molten steel outflow module includes a long nozzle, a throttling slide plate is installed on the long nozzle, the throttling slide plate hole controls the opening and closing degree of the long nozzle, the throttling slide plate is controlled by an oil cylinder, and the output signal of the PLC system controls the action of the oil cylinder.

[0008] Compared with the prior art, the beneficial effects of the present invention are: (1) The output signal of the PLC system can control the intercepting slide plate through the oil cylinder to adjust the opening and closing degree of the sliding nozzle, thereby realizing the control of the molten steel flow rate and further realizing the tundish tonnage control. The PLC system can not only be seamlessly docked with the existing mechanical mechanism, but also be optimized and adjusted according to the specific characteristics of the mechanical mechanism. This adaptability can ensure the operation efficiency and stability of the mechanical equipment.

[0009] (2) The PLC system is customized according to specific requirements and goals. This autonomy enables the PLC system to better meet specific operating requirements and environmental conditions, providing more freedom and customizability.

[0010] (3) The PLC system provides a highly adaptable, flexible design and new solution to meet specific mechanical operation requirements. This solution has significant advantages in improving the molten steel processing efficiency, reducing operating costs or improving product quality, etc. Brief Description of the Drawings

[0011] Figure 1 It is the system flow chart of the present invention; Figure 2 It is the equipment structure diagram of the present invention; Figure 3 It is the start-stop flow chart of the PLC system of the present invention.

[0012] In the figure: 1, ladle; 2, long nozzle; 3, tonnage sensor; 4, PLC system; 5, intercepting slide plate. Detailed Embodiment

[0013] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0014] Embodiment: Please refer to Figures 1-3 , the present invention provides a technical solution: a control system for maintaining the stability of the tundish tonnage, including a data entry module, which records the tundish tonnage data and preset parameters, and allows the operator to manually adjust the preset value or enter process parameters through the control button group; a monitoring module, the monitoring module reads the tonnage of the tundish in real time, and the monitoring module includes a tonnage sensor; a judgment module, the judgment module compares the tonnage of the tundish with the preset data; a molten steel outflow module, the molten steel outflow module controls the outflow amount of the molten steel based on the result of the judgment module; Several groups of preset data are set. The preset data is set based on the tonnage of the tundish. The data input module, monitoring module, judgment module, and preset data form a PLC system. The touch screen and industrial control keyboard of the PLC system provide a manual input function for the data input module; The PLC system controls the actions of the molten steel outflow module to adjust the outflow rate of the molten steel so as to maintain the tundish tonnage within the set range.

[0015] In this embodiment, as Figure 2 shown, Structure 1 is a ladle, Structure 2 is a long nozzle, Structure 3 is a tonnage sensor that can collect the tundish tonnage data in real time, Structure 4 is a PLC system responsible for processing the tundish tonnage data collected by the tonnage sensor and then outputting a control signal, Structure 5 is the intercepting slide plate of the ladle sliding nozzle, which is controlled by an oil cylinder. The PLC output signal can control the intercepting slide plate through the oil cylinder to adjust the opening degree of the sliding nozzle, thereby realizing the control of the molten steel flow rate and further realizing the control of the tundish tonnage.

[0016] In this embodiment, the real-time control of the tundish tonnage is achieved by combining the independently set PLC program with the existing machinery. Taking the collection of the tundish tonnage data as the input end, calculating through the independent PLC program and outputting a control signal to the control end of the tundish sliding nozzle. The three items are linked together to form a feasible start-stop process of a monitoring and control system, which is used to adjust the size of the ladle sliding nozzle to maintain the tundish tonnage within a specific range.

[0017] In specific applications, as Figure 3 shown, the steps of the PLC flow chart are as follows: 1. Start: The starting point of the process.

[0018] 2. Input the tundish tonnage A, A1: Input the current tundish tonnage A and the previous tundish tonnage A1.

[0019] 3. Read the tundish tonnage every 0.2S: The system reads the tundish tonnage every 0.2 seconds to achieve real-time monitoring.

[0020] 4. Judge whether A is less than or equal to A1 and less than or equal to 44.8: Check whether the current tundish tonnage A is less than or equal to the previous tonnage A1 and less than or equal to 44.8.

[0021] - If yes, execute the next step.

[0022] - If no, jump to the next judgment.

[0023] 5. Expand the ladle sliding nozzle for 0.2S: If the condition is met, expand the ladle sliding nozzle for 0.2 seconds to increase the molten steel flow rate.

[0024] 6. Determine whether A1 is less than or equal to A and less than or equal to 44.8: Check whether the previous tundish tonnage A1 is less than or equal to the current tonnage A and less than or equal to 44.8.

[0025] - If so, the process ends.

[0026] - If not, skip to the next judgment.

[0027] 7. Determine whether A is greater than or equal to A1 and greater than or equal to 45.2: Check whether the current tundish tonnage A is greater than or equal to the previous tonnage A1 and greater than or equal to 45.2.

[0028] - If so, execute the next step.

[0029] - If not, skip to the next judgment.

[0030] 8. Close the ladle sliding gate by 0.2 s: If the condition is satisfied, close the ladle sliding gate for 0.2 seconds to reduce the molten steel flow rate.

[0031] 9. Determine whether 45.2 is less than or equal to A and less than or equal to A1: Check whether the current tundish tonnage A is between 45.2 and the previous tonnage A1.

[0032] - If so, the process ends.

[0033] - If not, return to the step of reading the tundish tonnage.

[0034] In this embodiment, according to the existing mechanical mechanism, a matching PLC system is designed without a complete reconstruction.

[0035] This PLC system can not only be seamlessly docked with the existing mechanical mechanism, but also be optimized and adjusted according to the specific characteristics of the mechanical mechanism. This adaptability can ensure the operation efficiency and stability of the mechanical equipment.

[0036] It is customized according to specific requirements and goals. This autonomy enables the program to better meet specific operation requirements and environmental conditions.

[0037] This embodiment provides a highly adaptable, self-designed and innovative solution to meet specific mechanical operation requirements. This solution has significant advantages in improving steel production efficiency, reducing operating costs or improving product quality, etc.

[0038] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A control system for maintaining the stability of the tonnage of the middle package, characterized in that: include: A data entry module, the data entry module records the tonnage of the package; A monitoring module, which reads the tonnage of the intermediate package in real time; A judgment module, wherein the judgment module compares the tonnage of the middle package with preset data; A molten steel outflow module, which controls the outflow of the molten steel based on the result of the judgment module; Several groups of preset data are set, and the preset data are set based on the tonnage of the middle package. The data entry module, monitoring module, judgment module, and preset data constitute a PLC system. The PLC system controls the action of the molten steel outflow module to adjust the outflow of molten steel to maintain the tonnage of the middle package within the set range.

2. A control system for maintaining the stability of the tonnage of the middle package according to claim 1, characterized in that: The data entry module records the tonnage A of the current middle package and the tonnage A1 of the previous middle package.

3. A control system for maintaining the stability of the tonnage of the middle package according to claim 1, characterized in that: The monitoring module includes a tonnage sensor.

4. A control system for maintaining the stability of the tonnage of the middle package according to claim 3, characterized in that: The tonnage sensor reads the tonnage of the middle package every 0.2 seconds to achieve real-time monitoring.

5. A control system for maintaining the stability of the tonnage of the middle package according to claim 2, characterized in that: The judgment module includes judgment one, judgment two, judgment three, and judgment four; The judgment 1 determines whether A is less than or equal to A1 and less than or equal to 44.8: check whether the current middle package tonnage A is less than or equal to the previous tonnage A1 and less than or equal to 44.8, if not, jump to judgment 2; The second judgment determines whether A1 is less than or equal to A and less than or equal to 44.8: check whether the tonnage A1 of the previous middle package is less than or equal to the current tonnage A and less than or equal to 44.

8. If not, jump to judgment three; The judgment three determines whether A is greater than or equal to A1 and greater than or equal to 45.2: check whether the current middle package tonnage A is greater than or equal to the previous tonnage A1 and greater than or equal to 45.2, if not, jump to judgment four; The fourth judgment determines whether 45.2 is less than or equal to A and less than or equal to A1: check whether the current middle package tonnage A is between 45.2 and the previous tonnage A1, if not, return to the step of reading the middle package tonnage.

6. A control system for maintaining the stability of the tonnage of a middle package according to claim 1, characterized in that: The molten steel outflow module comprises a long shroud, and a cut-off slide is installed on the long shroud. The cut-off slide hole controls the opening and closing degree of the long shroud.

7. A control system for maintaining the stability of the tonnage of a middle package according to claim 1, characterized in that: The intercepting slide plate is controlled by a cylinder, and the output signal of the PLC system controls the action of the cylinder.

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