A method for automatically controlling the finishing mill loop of a hot rolling mill

Abstract

The application relates to a hot-rolling finishing-rolling loop grading automatic control method, which adopts an L2 process control system and an L1 basic automatic control system; the technical simulation operation worker intervention experience value of the loop is linked and matched with the L2 process control system and the L1 basic automatic control system, automatic control of the hot continuous rolling loop is realized under the premise of ensuring production stability, that is, zero intervention of the operation worker to the loop is realized.

Description

Technical Field

[0001] This invention relates to a control method, specifically an automatic control method for the classification of hot-rolled finishing loopers, belonging to the field of hot continuous rolling production technology. Background Technology

[0002] As smart manufacturing projects in the steel industry continue to advance to the production line, Meigang's 1422mm hot strip mill production line has put forward a zero-intervention requirement for looper operation. The measures already taken on-site include: directly prohibiting looper intervention adjustments on the F1, F2, and F3 front stands. Because the strip steel on the finishing mill's rear stands is becoming increasingly thinner while its speed is increasing, if the looper operation on the rear stands is forcibly prohibited, the risks of on-site steel pulling, tailing, and even scrap steel will rapidly increase, seriously affecting production stability.

[0003] After a novelty search, the existing technology disclosed the following solutions: (1) Patent application: CN201310241013.3, patent name: "Method for Variable Coefficient Control of Loop Compensation Main Machine Speed ​​in Hot Strip Milling". This invention belongs to the field of automatic control of loopers in hot strip milling lines, specifically a method for variable coefficient control of looper compensation main machine speed in hot strip milling lines. In the method for variable coefficient control of looper compensation main machine speed in hot strip milling lines, when the computer detects that the looper is biting the strip between adjacent stands of the finishing mill, the adaptive variable coefficient control of the looper compensation main machine speed is activated after a delay of 1-2 seconds, and the compensation value is calculated according to the formula. This invention realizes stable control of looper torque for thin strip milling lines, ensuring stable control of the strip between stands. It saves downtime and improves the surface qualification rate of products. The above solution is different from the automatic control method of looper achieved by simulating operator operation in this invention, and cannot solve the technical problems existing in the prior art, by controlling the variable coefficient of the looper compensation main machine speed. Summary of the Invention

[0004] This invention addresses the technical problems existing in the prior art by providing an automatic control method for the classification of loopers in hot rolling finishing mills. This application relates to an automatic control technology for the classification of loopers in hot rolling finishing mills. This technology simulates the operator's experience value of intervention on the loopers and achieves automatic control of hot continuous rolling loopers under the premise of ensuring stable production, that is, achieving zero operator intervention on the loopers.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: a method for automatic control of hot-rolled finishing looper classification, wherein the method achieves zero intervention of the operator on the looper by linking and cooperating the L2 process control system and the L1 basic automation control system.

[0006] in,

[0007] The L2 process control system has the following control process.

[0008] Based on a comprehensive analysis of the archived data on finishing mill looper interventions by on-site operators for different finishing mill types and thickness grades of strip steel, the finishing mill looper interventions are configured into four levels: Level 0, Level 1, Level 2, and Level 3. The configuration is based on the operator's chosen level of finishing mill looper intervention, following the principle that the greater the intervention amount, the higher the looper configuration level; a looper intervention level of 0 indicates no intervention.

[0009] The L2 finishing mill setting model and finishing mill specification configuration table have been updated to include a finishing mill looper classification configuration function based on different finishing mill races and different thickness grades, as shown in Table 1 "Finishing Mill Specification Configuration Table".

[0010] The L2 finishing mill setting model, based on the finishing mill race to which the strip's tap mark belongs and the thickness grade corresponding to the strip's specifications, distributes the finishing mill looper classification configuration information through the L2 application during the last setting.

[0011] in,

[0012] The L1 basic automation control system has the following control process.

[0013] The L1 basic automation control system reads the configuration data for the finishing mill looper classification issued by L2. When steel bites at different stands in the finishing mill, it matches the corresponding looper speed according to the received finishing mill looper classification configuration data and automatically adjusts the finishing mill looper action according to the control timing. The L1 program control flowchart is as follows: Figure 1 As shown.

[0014]

[0015] (1) When the finishing mill F4 stand bites the steel, the countdown begins until the looper reaches the working angle and the angle fluctuates within a small range, and the tension is constant, that is, when the looper reaches a stable state, the stand automatically reduces the lifting speed of the finishing mill looper according to the stored looper rate, so as to reduce the height of the finishing mill looper.

[0016] 1) If the finishing mill looper is configured to level 0, the operating speed of the finishing mill looper on this stand will remain under the current control and will not be adjusted.

[0017] 2) When the finishing mill looper is configured as level 1, the lifting speed of the finishing mill looper on that stand shall be reduced by 0.5%-5% (this value is determined based on the looper's speed).

[0018] 3) When the finishing mill looper is configured to level 2, the lifting speed of the finishing mill looper on that stand should be reduced by 1%-5% (this value is determined based on the looper's speed).

[0019] 4) When the finishing mill looper is configured to be level 3, the lifting speed of the finishing mill looper on that stand shall be reduced by 1.5%-5% (this value is determined based on the looper's speed).

[0020] (2) When the finishing mill F5 stand bites the steel, the countdown begins until the looper reaches the working angle and the angle fluctuates within a small range, and the tension is constant, that is, when the looper reaches a stable state, the stand automatically reduces the lifting speed of the finishing mill looper according to the stored looper rate, so as to reduce the height of the finishing mill looper.

[0021] 1) If the finishing mill looper is configured to level 0, the operating speed of the finishing mill looper on this stand will remain under the current control and will not be adjusted.

[0022] 2) When the finishing mill looper is configured as level 1, the lifting speed of the finishing mill looper on that stand shall be reduced by 1%-5% (this value is determined according to the looper speed).

[0023] 3) When the finishing mill looper is configured as level 2, the lifting speed of the finishing mill looper on that stand shall be reduced by 2%-5% (this value is determined according to the looper speed).

[0024] 4) When the finishing mill looper is configured to level 3, the lifting speed of the finishing mill looper on that stand shall be reduced by 3%-5% (this value is determined according to the looper speed).

[0025] (3) When the last stand of the finishing mill, namely the F6 stand, bites the steel, after a certain delay, clear the current looper control sequence and prepare to receive the finishing mill looper control sequence of the next strip.

[0026] Compared to existing technologies, this invention has the following advantages: When applied to production site control, this control method achieves zero intervention in the hot strip mill finishing looper. This zero-intervention not only improves labor efficiency and saves on the labor cost of one operator, but also reduces enterprise costs such as scrap reduction and hot shutdowns due to human error. Furthermore, this technology enables fully automated control of hot strip mill finishing looper production, contributing to the construction of a high-quality domestic production base. The technology categorizes operator intervention adjustments to the looper into four levels. It collects operator experience values ​​as settings for the L2 process control system, which are then sent to the L1 automation control system for automatic looper control. This technology addresses the issue of L1 equipment's inability to fine-tune by enabling precise control of different finishing strip types and thickness grades through the L2 process control system. It provides a direction and approach for solving the problem of L1 equipment's inability to fine-tune. Attached Figure Description

[0027] Figure 1 This is the L1 program control flowchart. Detailed Implementation

[0028] To enhance understanding of the present invention, the embodiments will be described in detail below with reference to the accompanying drawings.

[0029] Example 1: Taking the 2.5*1250 GR4160A2 pickled plate produced by Meigang 1422 hot continuous rolling as an example, the automatic control technology of hot rolling finishing looper classification is applied.

[0030] I. L2 Process Control System

[0031] (1) GR4160A2 pickled plate with a diameter of 2.5*1250 produced by 1422 hot continuous rolling, coil number 11898800500, has a finishing race of 1 and a thickness grade of 304. The L2 finishing rolling specification configuration table is for finishing race 1 and thickness grade 304, and the configured finishing looper is grade 2.

[0032] (2) When setting the finishing mill model for the last time, the configured finishing mill looper level 2 will be issued through L1 application.

[0033] II. L1 Basic Automation Control System

[0034] The L1 basic automation control system reads the finishing mill looper classification level 2 issued by L2. When steel bites at different stands in the finishing mill, it configures level 2 according to the received finishing mill looper classification, matches the corresponding looper speed, and automatically adjusts the finishing mill looper operation according to the control timing.

[0035] (1) When the finishing mill F4 stand bites the steel, the countdown begins until the looper reaches the working angle and the angle fluctuates within a small range, and the tension is constant, that is, the looper reaches a stable state. The F4 stand automatically reduces the lifting speed of the finishing mill looper by 1% according to the looper rate of the 2-level matching, so as to reduce the height of the finishing mill looper.

[0036] (2) When the finishing mill F5 stand bites the steel, the countdown begins until the looper reaches the working angle and the angle fluctuates within a small range, and the tension is constant, that is, the looper reaches a stable state. The F5 stand automatically reduces the lifting speed of the finishing mill looper by 2% according to the looper rate of the second-level matching, so as to reduce the height of the finishing mill looper.

[0037] (3) When the last stand of the finishing mill, namely the F6 stand, bites the steel, after a delay of 2 seconds, clear the current looper control timing and prepare to receive the finishing mill looper control timing of the next strip.

[0038] The above steps enable automatic control of the hot strip mill finishing looper. This control method, applied to production site control, achieves zero-intervention in the hot strip mill finishing looper operation.

[0039] It should be noted that the above embodiments are not intended to limit the scope of protection of the present invention. Equivalent transformations or substitutions made based on the above technical solutions all fall within the scope of protection of the claims of the present invention.

Claims

1. An automatic control method for classifying hot-rolled finishing loopers, characterized in that, By linking and coordinating the L2 process control system with the L1 basic automation control system, zero intervention by the operator on the looper can be achieved.

2. The automatic control method for classifying hot-rolled finishing loopers according to claim 1, characterized in that, The L2 process control system has the following control process. (1) Process specification formulation: Analysis of the data archived on the intervention of the finishing rolling looper. By comprehensively analyzing the data archived on the intervention of the finishing rolling looper by the on-site operators, and by analyzing the relationship between the intervention amount and the finishing rolling looper rate of different finishing rolling races and different thickness grades of strip steel, the intervention of the finishing rolling looper is divided into 4 levels: level 0, level 1, level 2 and level 3. The configuration principle is: the greater the looper intervention amount, the higher the looper configuration level; the looper intervention level configuration of level 0 means no intervention. (2) Model setting function development, L2 finishing mill setting model, finishing mill specification configuration table adds finishing mill looper classification setting configuration function according to different finishing mill races and different thickness grades; (3) Model setting reading and triggering: The L2 finishing mill setting model, according to the finishing mill race to which the strip's exit mark belongs and the thickness grade corresponding to the strip's specifications, sends the finishing mill looper classification configuration information to the common memory of the L2 process control system and the L1 basic automation control system through the L2 application during the last setting.

3. The automatic control method for classifying hot-rolled finishing loopers according to claim 1, characterized in that, The L1 basic automation control system has the following control process. The L1 basic automation control system processor reads the setting data for the finishing mill looper classification issued by L2 from the common memory, and automatically adjusts the finishing mill looper operation according to the control timing when different stands bite steel. (1) The L1 basic automation control system processor matches the corresponding looper speed according to the read finishing mill looper classification setting data and stores it. The specific control timing of the finishing mill looper operation is as follows. (2) When the fifth stand of the finishing mill bites the steel, the countdown begins. When the looper reaches a stable state, the stand automatically reduces the lifting speed of the finishing mill looper according to the stored looper rate, so as to reduce the height of the finishing mill looper. 1) If the finishing mill looper is configured to level 0, the operating speed of the finishing mill looper on this stand will remain under the current control and will not be adjusted. all, 2) When the finishing mill looper is configured as level 1, the lifting speed of the finishing mill looper on that stand should be reduced by 0.5%-5%. 3) When the finishing mill looper is configured in level 2, the lifting speed of the finishing mill looper on that stand should be reduced by 1%-5%. 4) When the finishing mill looper is configured with level 3, the lifting speed of the finishing mill looper on that stand should be reduced by 1.5%-5%. (3) When the sixth stand of the finishing mill bites the steel, the countdown begins. When the looper reaches a stable state, the stand automatically reduces the lifting speed of the finishing mill looper according to the stored looper rate, so as to reduce the height of the finishing mill looper. 1) If the finishing mill looper is configured to level 0, the operating speed of the finishing mill looper on this stand will remain under the current control and will not be adjusted. all, 2) When the finishing mill looper is configured as level 1, the lifting speed of the finishing mill looper on that stand should be reduced by 1%-5%. 3) When the finishing mill looper is configured to level 2, reduce the lifting speed of the finishing mill looper on that stand by 2%-5%. 4) When the finishing mill looper is configured with level 3, reduce the lifting speed of the finishing mill looper on that stand by 3%-5%. (4) When the last stand of the finishing mill bites the steel, after a certain delay, clear the currently stored looper settings and prepare to receive the finishing mill looper control settings for the next strip steel.

4. An electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the automatic control method for hot-rolled finishing looper classification as described in any one of claims 1 to 3 above.

5. A computer-readable storage medium storing computer instructions thereon, characterized in that, When the computer instructions are executed by the processor, they implement the automatic control method for hot-rolled finishing looper classification as described in any one of claims 1-3.

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