Control method of high-pressure water descaling equipment

Abstract

The invention relates to a high-pressure water descaling equipment control method, and belongs to the technical field of steel rolling control methods. According to the technical scheme, control programs of the descaling pump outlet circulating valve under two different working conditions of a circulating valve closing unloading mode in the descaling pump speed increasing process and a circulating valve opening unloading mode in the descaling pump speed increasing process are formulated, a descaling pump outlet circulating valve opening degree adjusting method is formulated, and the opening degree of the circulating valve is controlled; and a descaling program of a rolling mill and a descaling box behind the furnace is formulated, and accurate distance control over the steel billet and a descaling point is achieved. The high-pressure water descaling pump has the beneficial effects that the precision of the descaling equipment is improved, the high-pressure water descaling pump is stable in speed increasing and reducing operation, the descaling time is shortened, and the descaling water consumption cost is reduced, so that the power consumption cost of a descaling pump set is reduced, meanwhile, the service life of the descaling pump is prolonged, the pressure drop speed of the system is reduced, and the descaling effect is improved.

Description

Technical Field

[0001] This invention relates to a control method for high-pressure water descaling equipment, belonging to the technical field of steel rolling control methods. Background Technology

[0002] The high-pressure water descaling system, a core quality control device in medium and heavy plate rolling production, directly impacts the surface quality of the steel plates through its operational stability and precision. Handan Iron and Steel's 3500mm medium plate production line was relocated and put into operation in March 2023. The production line was upgraded from a single-stand to a dual-stand configuration, and the number of descaling pumps increased from two to three. The operating mode was adjusted from "one in use, one on standby" to "two in use, one on standby." With the accelerated production pace and higher product quality requirements, higher demands are placed on equipment performance. As a crucial link in ensuring product surface quality, the long-term stable operation of the descaling system is essential for the quality control of the production line.

[0003] A malfunction in the descaling pump, the core equipment of the high-pressure water system, will lead to a prolonged production line shutdown. This equipment is equipped with a high-power 3150KW motor, resulting in significant energy and water consumption. The original equipment had a lifespan of only one year, after which it needed to be taken offline and returned to the factory for repairs, with a single unit repair costing as much as 480,000 yuan, and the annual repair cost for three units reaching 1.44 million yuan. To reduce production costs, technical improvements are needed, focusing on enhancing the operational accuracy of the descaling equipment, extending the service life of the descaling pump, and simultaneously reducing system energy and water consumption. By preventing equipment accidents and improving equipment accuracy, production efficiency can be effectively improved. Summary of the Invention

[0004] The purpose of this invention is to provide a control method for high-pressure water descaling equipment. By setting the control program for the descaling pump outlet circulation valve, setting the rolling mill descaling program, and precisely adjusting the opening amount of the descaling pump outlet circulation valve, the accuracy of the descaling equipment can be improved, the high-pressure water descaling pump can operate stably during acceleration and deceleration, the descaling time can be shortened, the descaling water consumption cost can be reduced, thereby reducing the power consumption cost of the descaling pump group, extending the life of the descaling pump, reducing the system pressure drop rate, and improving the descaling effect, effectively solving the above-mentioned problems existing in the background technology.

[0005] The technical solution of this invention is: a control method for a high-pressure water descaling device, comprising the following steps: (1) Develop a control program for the outlet circulation valve of the descaling pump under two different operating conditions: the circulation valve is closed and unloading mode during the descaling pump speed-up process and the circulation valve is open and unloading mode during the descaling pump speed-up process. This will reduce the unloading water volume of the descaling pump during high-speed operation and shorten the high-speed operation time of the descaling pump. (2) Formulate a method for adjusting the opening degree of the circulation valve at the outlet of the descaling pump, control the opening degree of the circulation valve, and reduce pressure loss during the pressurization process; (3) Formulate the descaling procedure for the rolling mill and the descaling box after the furnace, adopt production line image signal technology and intelligent algorithm to monitor the position of the billet in real time and automatically trigger the descaling operation to achieve precise distance control between the billet and the descaling point.

[0006] In step (1), the control program for the unloading mode of the circulation valve during the descaling pump speed-up process is as follows: when the pressure of the high-pressure water system is lower than 21MPa, the descaling pump starts the pressure-up process. After the descaling pump receives the speed-up command for 5 seconds, the circulation valve closes the unloading function.

[0007] In step (1), the control program for the unloading mode of the circulation valve during the descaling pump speed-up process is as follows: when the system pressure exceeds 23MPa, the descaling pump starts to reduce pressure, and when the system pressure reaches 22.9MPa, the circulation valve opens the unloading function.

[0008] In step (2), first adjust the opening of the circulation valve to the maximum opening state, and then gradually and slowly close the valve; during this process, closely observe the operating status of the descaling pump. When a slight vibration is found in the pump body during the speed increase or decrease, immediately open the circulation valve in the opposite direction by half a turn; continue to observe the speed change process of the descaling pump. After confirming that the vibration phenomenon has been completely eliminated, the opening degree can be determined as the optimal working position; repeatedly verify to ensure that vibration can be effectively suppressed under various working conditions.

[0009] In step (3), based on the conveying speed of 1 m / s of the rolling mill roller table, combined with the steel plate position signal obtained by the rolling mill image acquisition system and the arrangement position of each group of descaling manifolds, the descaling control of four key positions, namely, the furnace descaling box inlet A, the furnace descaling box outlet B, the mill inlet C, and the mill outlet D, is realized.

[0010] Descaling control at inlet A of the descaling box after the furnace: a. Equipment layout parameters: The upper descaling nozzle is installed at 2.2 meters, and the lower descaling nozzle is installed at 3.3 meters; b. Trigger logic settings: When the rolling mill imaging system detects that the billet head image signal has reached a position of 1.2 meters, the control system issues a command to open the descaling valve. When the image signal of the billet tail reaches the 3.8-meter position, the control system issues a command to close the descaling valve; c. Actual operating parameters: When the distance between the billet head image signal and the nozzle is 1 meter, the descaling valve is opened to start water spraying. When the distance between the billet tail image signal and the nozzle is 0.5 meters, the descaling valve stops spraying water.

[0011] Descaling control at position B of the descaling box outlet after the furnace: a. Equipment layout parameters: The upper descaling nozzle is installed at 4.6 meters, and the lower descaling nozzle is installed at 6 meters; b. Trigger logic settings: When the rolling mill imaging system detects that the billet head image signal has reached the 3.6-meter position, the control system automatically issues a command to open the descaling valve. When the image signal of the billet tail reaches the 6.5-meter position, the control system automatically issues a command to close the descaling valve. c. Actual operating parameters: When the distance between the billet head image signal and the nozzle is 1 meter, the descaling valve is opened to start water spraying. When the distance between the billet tail image signal and the nozzle is 0.5 meters, the descaling valve stops spraying water.

[0012] Descaling control at mill inlet C position: a. Equipment layout parameters: The upper descaling nozzle is installed at 36.72 meters, and the lower descaling nozzle is installed at 36.14 meters; b. Trigger logic settings: When the rolling mill imaging system detects that the billet head image signal has reached the 35.14-meter position, the control system issues a command to open the descaling valve. When the image signal of the billet tail reaches the position of 37.22 meters, the control system issues a command to close the descaling valve; c. Actual operating parameters: When the distance between the billet head image signal and the nozzle is 1 meter, the descaling valve is opened to start water spraying. When the distance between the billet tail image signal and the nozzle is 0.5 meters, the descaling valve stops spraying water.

[0013] Descaling control at mill exit position D: a. Equipment layout parameters: The upper descaling nozzle is installed at 40.42 meters, and the lower descaling nozzle is installed at 41 meters; b. Trigger logic settings: When the rolling mill imaging system detects that the billet head image signal has reached the 42-meter position, the control system issues a command to open the descaling valve. When the image signal of the billet tail reaches the position of 40.92 meters, the control system issues a command to close the descaling valve. c. Actual operating parameters: When the distance between the billet head image signal and the nozzle is 1 meter, the descaling valve is opened to start water spraying. When the distance between the billet tail image signal and the nozzle is 0.5 meters, the descaling valve stops spraying water.

[0014] The beneficial effects of this invention are as follows: by setting the control program of the descaling pump outlet circulation valve, setting the rolling mill descaling program, and precisely adjusting the opening amount of the descaling pump outlet circulation valve, the accuracy of the descaling equipment can be improved, the high-pressure water descaling pump can be made to run stably during speed increase and decrease, the descaling time can be shortened, the descaling water consumption cost can be reduced, thereby reducing the power consumption cost of the descaling pump group, while also extending the service life of the descaling pump, reducing the system pressure drop rate, and improving the descaling effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the descaling manifold at the mill inlet and the descaling location of the steel plate according to the present invention; Figure 2 This is a schematic diagram of the descaling manifold at the mill exit and the descaling location of the steel plate in this invention; Figure 3 This is a schematic diagram of the descaling manifold and steel plate descaling positions after the furnace in this invention. Detailed Implementation

[0016] To make the purpose, technical solutions, and advantages of the invention's embodiments clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only a small part of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0017] A control method for a high-pressure water descaling device includes the following steps: (1) Develop a control program for the outlet circulation valve of the descaling pump under two different operating conditions: the circulation valve is closed and unloading mode during the descaling pump speed-up process and the circulation valve is open and unloading mode during the descaling pump speed-up process. This will reduce the unloading water volume of the descaling pump during high-speed operation and shorten the high-speed operation time of the descaling pump. (2) Formulate a method for adjusting the opening degree of the circulation valve at the outlet of the descaling pump, control the opening degree of the circulation valve, and reduce pressure loss during the pressurization process; (3) Formulate the descaling procedure for the rolling mill and the descaling box after the furnace, adopt production line image signal technology and intelligent algorithm to monitor the position of the billet in real time and automatically trigger the descaling operation to achieve precise distance control between the billet and the descaling point.

[0018] In step (1), the control program for the unloading mode of the circulation valve during the descaling pump speed-up process is as follows: when the pressure of the high-pressure water system is lower than 21MPa, the descaling pump starts the pressure-up process. After the descaling pump receives the speed-up command for 5 seconds, the circulation valve closes the unloading function.

[0019] In step (1), the control program for the unloading mode of the circulation valve during the descaling pump speed-up process is as follows: when the system pressure exceeds 23MPa, the descaling pump starts to reduce pressure, and when the system pressure reaches 22.9MPa, the circulation valve opens the unloading function.

[0020] In step (2), first adjust the opening of the circulation valve to the maximum opening state, and then gradually and slowly close the valve; during this process, closely observe the operating status of the descaling pump. When a slight vibration is found in the pump body during the speed increase or decrease, immediately open the circulation valve in the opposite direction by half a turn; continue to observe the speed change process of the descaling pump. After confirming that the vibration phenomenon has been completely eliminated, the opening degree can be determined as the optimal working position; repeatedly verify to ensure that vibration can be effectively suppressed under various working conditions.

[0021] In step (3), based on the conveying speed of 1 m / s of the rolling mill roller table, combined with the steel plate position signal obtained by the rolling mill image acquisition system and the arrangement position of each group of descaling manifolds, the descaling control of four key positions, namely, the furnace descaling box inlet A, the furnace descaling box outlet B, the mill inlet C, and the mill outlet D, is realized.

[0022] Descaling control at inlet A of the descaling box after the furnace: a. Equipment layout parameters: The upper descaling nozzle is installed at 2.2 meters, and the lower descaling nozzle is installed at 3.3 meters; b. Trigger logic settings: When the rolling mill imaging system detects that the billet head image signal has reached a position of 1.2 meters, the control system issues a command to open the descaling valve. When the image signal of the billet tail reaches the 3.8-meter position, the control system issues a command to close the descaling valve; c. Actual operating parameters: When the distance between the billet head image signal and the nozzle is 1 meter, the descaling valve is opened to start water spraying. When the distance between the billet tail image signal and the nozzle is 0.5 meters, the descaling valve stops spraying water.

[0023] Descaling control at position B of the descaling box outlet after the furnace: a. Equipment layout parameters: The upper descaling nozzle is installed at 4.6 meters, and the lower descaling nozzle is installed at 6 meters; b. Trigger logic settings: When the rolling mill imaging system detects that the billet head image signal has reached the 3.6-meter position, the control system automatically issues a command to open the descaling valve. When the image signal of the billet tail reaches the 6.5-meter position, the control system automatically issues a command to close the descaling valve. c. Actual operating parameters: When the distance between the billet head image signal and the nozzle is 1 meter, the descaling valve is opened to start water spraying. When the distance between the billet tail image signal and the nozzle is 0.5 meters, the descaling valve stops spraying water.

[0024] Descaling control at mill inlet C position: a. Equipment layout parameters: The upper descaling nozzle is installed at 36.72 meters, and the lower descaling nozzle is installed at 36.14 meters; b. Trigger logic settings: When the rolling mill imaging system detects that the billet head image signal has reached the 35.14-meter position, the control system issues a command to open the descaling valve. When the image signal of the billet tail reaches the position of 37.22 meters, the control system issues a command to close the descaling valve; c. Actual operating parameters: When the distance between the billet head image signal and the nozzle is 1 meter, the descaling valve is opened to start water spraying. When the distance between the billet tail image signal and the nozzle is 0.5 meters, the descaling valve stops spraying water.

[0025] Descaling control at mill exit position D: a. Equipment layout parameters: The upper descaling nozzle is installed at 40.42 meters, and the lower descaling nozzle is installed at 41 meters; b. Trigger logic settings: When the rolling mill imaging system detects that the billet head image signal has reached the 42-meter position, the control system issues a command to open the descaling valve. When the image signal of the billet tail reaches the position of 40.92 meters, the control system issues a command to close the descaling valve. c. Actual operating parameters: When the distance between the billet head image signal and the nozzle is 1 meter, the descaling valve is opened to start water spraying. When the distance between the billet tail image signal and the nozzle is 0.5 meters, the descaling valve stops spraying water.

[0026] In practical applications, this invention sets a control program for closing (A) and opening (B) the pump outlet circulation valve during the descaling pump speed-up process, so that the circulation valve of the descaling pump is in two energy-saving modes during the speed-up process, specifically: A: A control program was developed for the descaling pump's speed-up process, specifically addressing the efficiency issue during this process. When the high-pressure water system pressure drops below 21 MPa, the descaling pump begins its pressurization process. To ensure stability during speed increase and improve pump efficiency, a circulation valve closing signal was implemented: 5 seconds after the descaling pump receives the speed-up command, the circulation valve will close its unloading function. This interlocking control design offers multiple advantages: it ensures smooth operation during the speed-up phase and significantly improves pump efficiency. Furthermore, this solution effectively shortens the high-speed operation time of the descaling pump and reduces water and electricity consumption during the speed-up process.

[0027] B: A control program was developed for the descaling pump's speed-up process and the circulation valve opening unloading mode, focusing on resolving the stability issue during the descaling pump's speed reduction. When the system pressure exceeds 23 MPa, the descaling pump begins pressure reduction. To ensure the stability of the speed reduction process, a circulation valve opening signal is set before speed reduction: when the system pressure reaches 22.9 MPa, the circulation valve opens to unload. This control strategy also achieves multiple benefits: it ensures a smooth transition during the speed reduction process while maintaining the working efficiency during the speed-up phase.

[0028] The two control schemes (B and B) achieve optimal operation of the descaling pump under different working conditions through precise pressure parameter settings and timing control. 21MPa and 23MPa are designated as key pressure thresholds, and 22.9MPa as the deceleration trigger point, combined with a 5-second delay shutdown design, forming a complete pressure regulation system. These technical measures not only improve system response speed but also reduce energy consumption and extend equipment lifespan. Through intelligent control of the circulation valve, the system can minimize water waste while ensuring process requirements are met, reflecting the energy-saving and environmentally friendly design concept of modern industrial control systems.

[0029] Adjusting the opening of the circulation valve at the outlet of the descaling pump refers to the technical operation of precisely adjusting the opening amount of the circulation valve. During the operation of the descaling pump, when the pump body accelerates or decelerates, its shaft speed changes drastically by 2100 revolutions per second within 3 seconds. This sudden change in speed causes rapid fluctuations in the fluid velocity and pressure inside the pump, generating strong hydraulic shocks, which in turn lead to vibration problems in the descaling pump body and connecting pipelines. To effectively alleviate this phenomenon, it is necessary to coordinate the opening action of the circulation valve during the descaling pump speed change to buffer the system shock through unloading water flow. The specific adjustment method is as follows: First, adjust the opening of the circulation valve to the maximum opening state, and then gradually and slowly close the valve. During this process, closely observe the operating status of the descaling pump. When slight vibration is found in the pump body during acceleration or deceleration, immediately open the circulation valve in the opposite direction by half a turn. Continue to observe the speed change process of the descaling pump. After confirming that the vibration phenomenon has been completely eliminated, the opening position can be determined as the optimal working position. This adjustment process needs to be repeatedly verified to ensure that vibration can be effectively suppressed under various operating conditions. By precisely controlling the opening degree of the circulation valve, sufficient unloading water volume can be ensured to buffer pressure shocks, while avoiding energy waste caused by over-opening. The key to this method is to appropriately increase the safety margin after finding the vibration critical point, thereby ensuring the stability and reliability of the system operation.

[0030] The core of developing an automatic descaling program for the mill and the descaling box after the furnace lies in using the conveying speed of 1 m / s on the rolling mill roller table, combined with the steel plate position signal obtained by the rolling mill image acquisition system and the arrangement position of each group of descaling manifolds, to achieve automatic descaling control at four key positions: the inlet A of the descaling box after the furnace, the outlet B of the descaling box after the furnace, the inlet C of the mill, and the outlet D of the mill.

[0031] The implementation of this invention achieves the following technical advantages: 1. Precise control: Through the coordinated operation of the image positioning system and the automatic control system, the descaling operation is ensured to be carried out in the optimal position range.

[0032] 2. Resource conservation: It avoids the phenomenon of premature or delayed water spraying caused by human judgment errors in traditional manual operation, which significantly reduces water consumption and thus reduces power consumption.

[0033] 3. Process optimization: Automated descaling control makes the process parameters of the entire rolling process more stable, which is conducive to improving the consistency of product quality.

[0034] 4. Efficiency Improvement: It eliminates manual intervention, shortens process time, and improves the overall operating efficiency of the production line.

[0035] During system operation, all control parameters are monitored and recorded in real time through the central control system, providing reliable data support for subsequent process optimization. Simultaneously, the system features automatic alarm functions for abnormal situations, ensuring production safety. The application of this automatic descaling program marks a new stage in the automation level of the production line, laying a solid foundation for subsequent intelligent transformation.

[0036] This invention enables the descaling pump's circulation valve to operate in two energy-saving modes, A and B, during acceleration. These two control schemes, through precise pressure parameter settings and timing control, achieve optimal operation of the descaling pump under different working conditions. 21MPa and 23MPa are designated as key pressure thresholds, and 22.9MPa as the deceleration trigger point. Combined with a 5-second delay shutdown design, this constitutes a complete pressure regulation system. These technical measures not only improve system response speed but also reduce energy consumption and extend equipment lifespan. Through intelligent control of the circulation valve, the system can minimize water waste while ensuring process requirements are met, embodying the energy-saving and environmentally friendly design philosophy of modern industrial control systems.

[0037] The precise adjustment of the opening amount of the descaling pump outlet circulation valve ensures sufficient unloading water volume to buffer pressure shocks while avoiding energy waste caused by over-opening.

[0038] This invention changes the waste of water and electricity caused by manual descaling in the past, and achieves technical advantages such as precise control of descaling position, resource saving, automated process and efficiency improvement.

Claims

1. A control method for a high-pressure water descaling device, characterized in that... Includes the following steps: (1) Develop a control program for the outlet circulation valve of the descaling pump under two different operating conditions: the circulation valve is closed and unloading mode during the descaling pump speed-up process and the circulation valve is open and unloading mode during the descaling pump speed-up process. This will reduce the unloading water volume of the descaling pump during high-speed operation and shorten the high-speed operation time of the descaling pump. (2) Formulate a method for adjusting the opening degree of the circulation valve at the outlet of the descaling pump, control the opening degree of the circulation valve, and reduce pressure loss during the pressurization process; (3) Formulate the descaling procedure for the rolling mill and the descaling box after the furnace, adopt production line image signal technology and intelligent algorithm to monitor the position of the billet in real time and automatically trigger the descaling operation to achieve precise distance control between the billet and the descaling point.

2. The control method for a high-pressure water descaling device according to claim 1, characterized in that: In step (1), the control program for the unloading mode of the circulation valve during the descaling pump speed-up process is as follows: when the pressure of the high-pressure water system is lower than 21MPa, the descaling pump starts the pressure-up process. After the descaling pump receives the speed-up command for 5 seconds, the circulation valve closes the unloading function.

3. The control method for a high-pressure water descaling device according to claim 1, characterized in that: In step (1), the control program for the unloading mode of the circulation valve during the descaling pump speed-up process is as follows: when the system pressure exceeds 23MPa, the descaling pump starts to reduce pressure, and when the system pressure reaches 22.9MPa, the circulation valve opens the unloading function.

4. The control method for a high-pressure water descaling device according to claim 1, characterized in that: In step (2), first adjust the opening of the circulation valve to the maximum opening state, and then gradually and slowly close the valve; during this process, closely observe the operating status of the descaling pump. When a slight vibration is found in the pump body during the speed increase or decrease, immediately open the circulation valve in the opposite direction by half a turn; continue to observe the speed change process of the descaling pump. After confirming that the vibration phenomenon has been completely eliminated, the opening degree can be determined as the optimal working position; repeatedly verify to ensure that vibration can be effectively suppressed under various working conditions.

5. The control method for a high-pressure water descaling device according to claim 1, characterized in that: In step (3), based on the conveying speed of 1 m / s of the rolling mill roller table, combined with the steel plate position signal obtained by the rolling mill image acquisition system and the arrangement position of each group of descaling manifolds, the descaling control of four key positions, namely, the furnace descaling box inlet A, the furnace descaling box outlet B, the mill inlet C, and the mill outlet D, is realized.

6. The control method for a high-pressure water descaling device according to claim 5, characterized in that: Descaling control at inlet A of the descaling box after the furnace: a. Equipment layout parameters: The upper descaling nozzle is installed at 2.2 meters, and the lower descaling nozzle is installed at 3.3 meters; b. Trigger logic settings: When the rolling mill imaging system detects that the billet head image signal has reached a position of 1.2 meters, the control system issues a command to open the descaling valve. When the image signal of the billet tail reaches the 3.8-meter position, the control system issues a command to close the descaling valve; c. Actual operating parameters: When the distance between the billet head image signal and the nozzle is 1 meter, the descaling valve is opened to start water spraying. When the distance between the billet tail image signal and the nozzle is 0.5 meters, the descaling valve stops spraying water.

7. The control method for a high-pressure water descaling device according to claim 5, characterized in that: Descaling control at position B of the descaling box outlet after the furnace: a. Equipment layout parameters: The upper descaling nozzle is installed at 4.6 meters, and the lower descaling nozzle is installed at 6 meters; b. Trigger logic settings: When the rolling mill imaging system detects that the billet head image signal has reached the 3.6-meter position, the control system automatically issues a command to open the descaling valve. When the image signal of the billet tail reaches the 6.5-meter position, the control system automatically issues a command to close the descaling valve. c. Actual operating parameters: When the distance between the billet head image signal and the nozzle is 1 meter, the descaling valve is opened to start water spraying. When the distance between the billet tail image signal and the nozzle is 0.5 meters, the descaling valve stops spraying water.

8. The control method for a high-pressure water descaling device according to claim 5, characterized in that: Descaling control at mill inlet C position: a. Equipment layout parameters: The upper descaling nozzle is installed at 36.72 meters, and the lower descaling nozzle is installed at 36.14 meters; b. Trigger logic settings: When the rolling mill imaging system detects that the billet head image signal has reached the 35.14-meter position, the control system issues a command to open the descaling valve. When the image signal of the billet tail reaches the position of 37.22 meters, the control system issues a command to close the descaling valve; c. Actual operating parameters: When the distance between the billet head image signal and the nozzle is 1 meter, the descaling valve is opened to start water spraying. When the distance between the billet tail image signal and the nozzle is 0.5 meters, the descaling valve stops spraying water.

9. The control method for a high-pressure water descaling device according to claim 5, characterized in that: Descaling control at mill exit position D: a. Equipment layout parameters: The upper descaling nozzle is installed at 40.42 meters, and the lower descaling nozzle is installed at 41 meters; b. Trigger logic settings: When the rolling mill imaging system detects that the billet head image signal has reached the 42-meter position, the control system issues a command to open the descaling valve. When the image signal of the billet tail reaches the position of 40.92 meters, the control system issues a command to close the descaling valve. c. Actual operating parameters: When the distance between the billet head image signal and the nozzle is 1 meter, the descaling valve is opened to start water spraying. When the distance between the billet tail image signal and the nozzle is 0.5 meters, the descaling valve stops spraying water.

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