A pinch roll tension current limit control method and system

Abstract

The application discloses a pinch roll tension current limiting control method, and relates to the field of steel production, and solves the technical problem that a large deviation is caused between feedback speed and set speed of the existing pinch roll. It comprises the following steps: step one, collecting the roll diameter of the pinch roll; step two, collecting the real-time tension current of the pinch roll; step three, collecting the real-time torque of the pinch roll; step four, limiting control of the real-time tension current of the pinch roll; step five, displaying the limiting control of the real-time tension current of the pinch roll; step six, obtaining the speed difference value in the rolling process of the pinch roll; and step seven, precisely quantifying and superimposing the control of the roll gap of the pinch roll in the rolling process. The application further discloses a pinch roll tension current limiting control system. The application can reduce accident time, improve production output and the finished product rate index.

Description

Technical Field

[0001] This invention relates to the field of steel production, and more specifically, to a method and system for limiting the tension current of pinch rolls. Background Technology

[0002] The pinch rolls in high-speed rolling mills are crucial, directly impacting the connection between the finishing mill and the wire rod mill, particularly in speed control. However, significant uncertainties exist in controlling the pinch roll clamping force. Excessive clamping force can cause the pinch roll drive motor to trip due to excessive current, while insufficient clamping force can lead to problems with speed coordination between the pinch roll and the finishing mill, as well as with the wire rod mill and workpiece transfer. Therefore, actual pinch roll control must achieve both reasonable clamping force and sufficient transfer force for the workpiece. Furthermore, it's essential to maintain overall current control during clamping to prevent protective tripping. However, current technology lacks this design feature, resulting in either insufficient clamping force or pinch roll drive motor tripping during actual rolling operations. A serious problem with existing technology is that if the transmission system experiences current saturation protection during normal rolling, it will cause a significant deviation between the feedback speed of the pinch rolls and the set speed. This leads to problems in on-site process control, resulting in either quality issues with the rolled piece at the pinch rolls or steel piling due to workpiece waviness in the high-speed zone. Therefore, existing technology has many defects and shortcomings, cannot be well matched to the production process, and causes quality problems and steel piling issues during production. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method and system for tension current limiting control of pinch rollers, which addresses the shortcomings of the existing technology and solves the technical problem that the feedback speed and the set speed of the existing pinch rollers will have a large deviation.

[0004] The tension current limiting control method for pinch rollers according to the present invention includes the following steps:

[0005] Step 1: Collect the diameter of the pinch roller;

[0006] Step 2: Collect the real-time tension current of the pinch roller;

[0007] Step 3: Collect the real-time torque of the pinch roller;

[0008] Step 4: Real-time tension current limiting control of the pinch roller;

[0009] Step 5: Display the real-time tension current limit of the pinch roller;

[0010] Step 6: Obtain the speed difference during the pinch roll rolling process;

[0011] Step 7: Precise quantitative superposition control of the roll gap of the pinch rolls during the rolling process.

[0012] As a further improvement, when a clamping abnormality occurs or a protective command triggers compensation, the speed of the pinch roller is differentially compensated. The method for differentially compensating the speed of the pinch roller includes:

[0013] Set an average speed value, obtain the real-time speed of the pinch roller, and compare the average speed value with the real-time speed of the pinch roller to obtain a speed compensation value.

[0014] The expression for calculating the speed compensation value is:

[0015] V 补偿 =V 均 -V 当前

[0016] Where V 补偿 V is the speed compensation value. 均 V is the average speed. 当前 The real-time speed of the pinch roller.

[0017] Furthermore, in step two, the real-time tension current of the pinch roller is acquired through a current identification sensor and a signal transmission system.

[0018] Furthermore, in step three, the real-time torque of the pinch roller is acquired through a torque conversion and identification sensor and a signal transmission system.

[0019] Furthermore, in step four, the real-time tension current limiting control method of the pinch roller includes: setting the torque amplitude and the current amplitude, comparing the real-time torque of the pinch roller with the torque amplitude, and obtaining the torque difference.

[0020] The real-time tension current and current amplitude of the pinch roller are compared to obtain the current difference; the tension current value of the pinch roller is calculated by comparing the torque difference and the current difference.

[0021] Furthermore, the expression for calculating the tension current value of the pinch roller is:

[0022]

[0023] Where I is the tension current value of the pinch roller. The torque difference is defined as follows: F1 is the real-time torque of the pinch roller, I1 is the real-time tension current of the pinch roller, K1 is the torque correction coefficient, and K2 is the current correction coefficient.

[0024] Furthermore, in step seven, a time axis is established, the roll gap of the pinch roll at different time points is obtained, and the average value of the roll gap of the pinch roll in the time interval is calculated using the roll gap of the pinch roll at different time points.

[0025] Furthermore, the expression for calculating the average value of the roll gap of the pinch roll is:

[0026]

[0027] Laver is the average value of the pinch roll gap collected in the time interval, n is the number of time points in the time axis, and L is the real-time pinch roll gap collected at each different time point in the time axis.

[0028] A pinch roll tension current limiting control system, comprising,

[0029] The integrated control module for matching the diameter of the double-high-speed pinch roll is used to collect the diameter of the pinch roll;

[0030] The pinch roll current acquisition and closed-loop control module is used to acquire the real-time tension current of the pinch roll;

[0031] The pinch roller torque acquisition and closed-loop control module is used to acquire the real-time torque of the pinch roller;

[0032] The tension current limiting logic control and timing control module of the pinch roll is used for real-time tension current limiting control of the pinch roll.

[0033] The pinch roll tension current limit visualization setting and command import control module is used to display the real-time tension current limit of the pinch roll.

[0034] The pinch roll tension current limiting feedback speed drop early warning control module is used to obtain the speed difference value of the pinch roll during the rolling process;

[0035] The feedback speed drop roller diameter intelligent compensation control module is used to intelligently differentiate the roller diameter of the clamping roller when the clamping is abnormal or a protective command is triggered.

[0036] The tension current limiting control module for the pinch roll gap and roll diameter linkage is used to precisely quantify and superimpose control the gap of the pinch roll during the rolling process.

[0037] As a further improvement, the pinch roller tension current limiting visualization setting and command import control module includes a command import control unit, which is used for command transmission and command execution connection. Beneficial effects

[0038] The advantages of this invention are:

[0039] 1. By collecting the diameter of the pinch roll, the current of the pinch roll, the torque of the pinch roll, controlling the tension current of the pinch roll, displaying the tension current limit of the pinch roll, obtaining the speed difference of the pinch roll during the rolling process, and accurately quantifying and superimposing the roll gap of the pinch roll during the rolling process, optimal control of the tension current limit of the pinch roll based on the intelligent matching of on-site rolling elements can be achieved. This ensures the clamping effect and speed stability of the pinch roll, while avoiding accidents caused by protective tripping, thereby reducing accident time and improving production output and yield.

[0040] 2. By collecting the roller diameter, current and torque of the pinch rolls, intelligent matching of all rolling elements for pinch roll control is achieved.

[0041] 3. By precisely quantifying and superimposing the roll gap of the pinch rolls during the rolling process, the signal symmetry connection optimization control of the pinch roll control process is achieved.

[0042] 4. By controlling the tension and current of the pinch roll and displaying the tension and current limit of the pinch roll, steel accumulation in the pinch roll area during the rolling process can be effectively avoided, achieving optimal control of the pinch roll tension and current limit based on intelligent matching of on-site rolling elements. Attached Figure Description

[0043] Figure 1 This is a flowchart of the tension current limiting control method for the pinch roller of the present invention;

[0044] Figure 2 This is a block diagram of the tension current limiting control system for the pinch roller of the present invention. Detailed Implementation

[0045] The present invention will be further described below with reference to embodiments, but this does not constitute any limitation on the present invention. Any limited modifications made by any person within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0046] See Figures 1-2 The present invention provides a method for limiting the tension current of a pinch roller, which includes the following steps:

[0047] Step 1: Collect the diameter of the pinch rolls. Pinch rolls refer to the workpiece clamping and conveying equipment located between the finishing mill and the wire rod mill on a double-high-speed wire rod production line. Roll diameter matching integrated control refers to the systematic design of process control based on the basic and error values ​​of the roll diameter. Data acquisition refers to collecting relevant data from the pinch rolls during the rolling process. Parameter import refers to importing and optimizing the relevant control parameters of the pinch rolls.

[0048] Step Two: Acquire the real-time tension current of the pinch roll. In Step Two, the real-time tension current of the pinch roll is acquired through a current identification sensor and a signal transmission system. Dynamic amplitude closed-loop control of the current process amplitude refers to the precise quantitative control of the amplitude during the pinch roll clamping process through an innovatively designed amplitude monitoring system and amplitude control logic switching system.

[0049] Step 3: Acquire the real-time torque of the pinch rolls; In step 3, the real-time torque of the pinch rolls is acquired through a torque conversion and identification sensor and a signal transmission system. Pinch roll torque acquisition refers to collecting the torque of the pinch rolls during the normal rolling process, mainly accomplished through integrated control of the torque conversion and identification sensor and signal transmission system. Dynamic amplitude closed-loop control of the torque process amplitude refers to achieving precise quantitative control of the amplitude during the pinch roll clamping process through an innovatively designed amplitude monitoring system and amplitude control logic transition.

[0050] Step 4: Real-time tension current limiting control of the pinch rollers.

[0051] In step four, the real-time tension current limiting control method of the pinch roller includes: setting the torque amplitude and current amplitude, comparing the real-time torque of the pinch roller with the torque amplitude, and obtaining the torque difference;

[0052] The real-time tension current of the pinch roll is compared with the current amplitude to obtain the current difference; the tension current value of the pinch roll is calculated by comparing the torque difference with the current difference.

[0053] The expression for calculating the tension current value of the pinch roll is:

[0054]

[0055] Where I is the tension current value of the pinch roller. F1 is the real-time torque of the pinch roller, I1 is the real-time tension current of the pinch roller, ΔI is the current difference, K1 is the torque correction coefficient (taken as 0.8), and K2 is the current correction coefficient (taken as 0.75).

[0056] When the torque difference The real-time torque F1 of the pinch roller is 10 N / m, the real-time tension current I1 of the pinch roller is 1 A, and the current difference is 0.5 A. Therefore, the tension current value I of the pinch roller is approximately 0.65 A.

[0057] Integrated control enables optimal superposition control of tension and current control. Tension-current limiting logic control refers to logic recognition and logic command transmission control based on process control. Tension-current limiting timing control refers to timing command design based on timing flow.

[0058] Step 5: Display the real-time tension current limit of the pinch roll; the pinch roll tension current limit visualization system refers to a key variable import setting control system designed based on the window control system of the pinch roll tension current limit. Command import control refers to import control designed based on command transmission and command execution connection. Integrated control of parameter import and command output can realize rapid adjustment of pinch roll matching during the rolling process.

[0059] Step Six: Obtain the speed difference during the pinch roll rolling process; the pinch roll tension current limiting feedback speed system refers to a closed-loop speed control system based on speed setting and speed feedback throughout the entire pinch roll control process. Feedback speed drop warning refers to the differential speed response when clamping abnormalities occur or protective commands are triggered. This differential response can affect the smoothness of production. The feedback speed drop warning control system can promptly eliminate the impact of speed drops on the rolling line.

[0060] When a clamping abnormality occurs or a protective command triggers compensation, differential compensation is applied to the speed of the pinch roller. Methods for differential compensation of the pinch roller speed include:

[0061] Set the average speed, obtain the real-time speed of the pinch roller, compare the average speed with the real-time speed of the pinch roller, and obtain the speed compensation value.

[0062] The expression for calculating the speed compensation value is:

[0063] V 补偿 =V 均 -V 当前

[0064] Where V 补偿 V is the speed compensation value. 均 V is the average velocity. 当前 This refers to the real-time speed of the pinch rollers.

[0065] When the average speed is 10 m / H and the real-time speed of the pinch roller is 2 m / H, the speed compensation value V 补偿 It is 8m / H.

[0066] Based on intelligent optimization of pinch roll gap difference and roll diameter linkage, precise quantitative superposition control of the pinch roll gap during the rolling process is achieved. Intelligent compensation for feedback speed drop in roll diameter refers to intelligent optimization control based on the dynamic speed change during feedback speed drop and the introduction of roll diameter deviation margin. Intelligent differential compensation for roll diameter refers to parameterized control optimization at the system initialization input end based on the difference variable in the field, thereby achieving intelligent correction at the output end.

[0067] Step 7: Precise quantitative superposition control of the roll gap of the pinch rolls during the rolling process.

[0068] In step seven, a time axis is established, and the roll gap of the pinch rolls at different time points is obtained. The average value of the roll gap of the pinch rolls in the time interval is calculated using the roll gaps of the pinch rolls at different time points.

[0069] The expression for calculating the average value of the roll gap of the pinch rolls is:

[0070]

[0071] L aver is the average value of the pinch roll gap collected within the time interval, n is the number of time points in the time axis, and L is the real-time pinch roll gap collected at different time points in the time axis.

[0072] When the number of time points in the time axis is 3, and the roll gaps of the pinch rolls at different time points are 1m, 2m, and 3m respectively, then the average value L of the pinch roll gaps collected in the time interval is... aver It is 2m.

[0073] The roll gap of the pinch roll refers to an important parameter variable in the actual use of the pinch roll; specifically, it is the gap between the upper and lower rolls, serving as the transmission channel for the rolled workpiece. The tension and current limiting control based on the linkage between the pinch roll gap and roll diameter refers to an integrated control system that optimizes the pinch roll gap difference and intelligently optimizes the linkage between the roll diameter and the tension and current.

[0074] A pinch roll tension current limiting control system, comprising,

[0075] The integrated control module for matching the diameter of the double-high-speed pinch roll is used to collect the diameter of the pinch roll;

[0076] The pinch roll current acquisition and closed-loop control module is used to acquire the real-time tension current of the pinch roll.

[0077] The pinch roller torque acquisition and closed-loop control module is used to acquire the real-time torque of the pinch roller;

[0078] The tension current limiting logic control and timing control module for the pinch roll is used for real-time tension current limiting control of the pinch roll.

[0079] The pinch roll tension current limit visualization setting and command import control module is used to display the real-time tension current limit of the pinch roll; the pinch roll tension current limit visualization setting and command import control module includes a command import control unit, which is used for command transmission and command execution connection.

[0080] The pinch roll tension current limiting feedback speed drop early warning control module is used to obtain the speed difference value of the pinch roll during the rolling process;

[0081] The feedback speed drop roller diameter intelligent compensation control module is used to intelligently differentiate the roller diameter of the clamping roller when the clamping is abnormal or a protective command is triggered.

[0082] The tension current limiting control module for the pinch roll gap and roll diameter linkage is used to precisely quantify and superimpose control the pinch roll gap during the rolling process.

[0083] By incorporating a comprehensive control module for matching the diameter of the double-high wire rod pinch roll, a pinch roll current acquisition and closed-loop control module, a pinch roll torque acquisition and closed-loop control module, a pinch roll tension current limiting logic control and timing control module, a pinch roll tension current limiting visualization setting and command import control module, a pinch roll tension current limiting feedback speed drop early warning control system, a feedback speed drop roll diameter intelligent compensation control system, a feedback speed drop roll diameter intelligent compensation control system, and a pinch roll gap and roll diameter linkage tension current limiting control system, optimal control of the pinch roll tension current limiting based on intelligent matching of on-site rolling elements can be achieved. This ensures the pinch roll clamping effect and speed stability, while avoiding accidents caused by protective tripping, thereby reducing accident time and improving production output and yield.

[0084] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A method for limiting the tension current of a pinch roller, characterized in that, It includes the following steps: Step 1: Collect the diameter of the pinch roller; Step 2: Collect the real-time tension current of the pinch roller; Step 3: Collect the real-time torque of the pinch roller; Step 4: Real-time tension current limiting control of the pinch roller; Step 5: Display the real-time tension current limit of the pinch roller; Step 6: Obtain the speed difference during the pinch roll rolling process; Step 7: Precise quantitative superposition control of the roll gap of the pinch rolls during the rolling process; In step four, the real-time tension current limiting control method of the pinch roller includes: setting the torque amplitude and the current amplitude, comparing the real-time torque of the pinch roller with the torque amplitude, and obtaining the torque difference. The real-time tension current of the pinch roll is compared with the current amplitude to obtain the current difference; the tension current value of the pinch roll is calculated by the torque difference and the current difference. The expression for calculating the tension current value of the pinch roller is: Where I is the tension current value of the pinch roller. The torque difference is defined as follows: F1 is the real-time torque of the pinch roller, I1 is the real-time tension current of the pinch roller, K1 is the torque correction coefficient, and K2 is the current correction coefficient. In step seven, a time axis is established, and the roll gap of the pinch roll at different time points is obtained. The average value of the roll gap of the pinch roll in the time interval is calculated using the roll gap of the pinch roll at different time points.

2. The method for limiting the tension current of a pinch roller according to claim 1, characterized in that, When a clamping abnormality occurs or a protective command triggers compensation, differential compensation is performed on the speed of the pinch roller. The method for differential compensation of the speed of the pinch roller includes: Set an average speed value, obtain the real-time speed of the pinch roller, and compare the average speed value with the real-time speed of the pinch roller to obtain a speed compensation value. The expression for calculating the speed compensation value is: V 补偿 =V 均 -V 当前 Where V 补偿 V is the speed compensation value. 均 V is the average speed. 当前 The real-time speed of the pinch roller.

3. The method for limiting the tension current of a pinch roller according to claim 1, characterized in that, In step two, the real-time tension current of the pinch roller is acquired through a current identification sensor and a signal transmission system.

4. The method for limiting the tension current of a pinch roller according to claim 1, characterized in that, In step three, the real-time torque of the pinch roller is acquired through a torque conversion and identification sensor and a signal transmission system.

5. The method for limiting the tension current of a pinch roller according to claim 1, characterized in that, The expression for calculating the average value of the roll gap of the pinch roll is as follows: L aver is the average value of the pinch roll gap collected within the time interval, n is the number of time points in the time axis, and L is the real-time pinch roll gap collected at each different time point in the time axis.

6. A system applying the tension current limiting control method for pinch rolls according to any one of claims 1-5, characterized in that, It includes, The integrated control module for matching the diameter of the double-high-speed pinch roll is used to collect the diameter of the pinch roll; The pinch roll current acquisition and closed-loop control module is used to acquire the real-time tension current of the pinch roll; The pinch roller torque acquisition and closed-loop control module is used to acquire the real-time torque of the pinch roller; The tension current limiting logic control and timing control module of the pinch roll is used for real-time tension current limiting control of the pinch roll. The pinch roll tension current limit visualization setting and command import control module is used to display the real-time tension current limit of the pinch roll. The pinch roll tension current limiting feedback speed drop early warning control module is used to obtain the speed difference value of the pinch roll during the rolling process; The feedback speed drop roller diameter intelligent compensation control module is used to intelligently differentiate the roller diameter of the clamping roller when the clamping is abnormal or a protective command is triggered. The tension current limiting control module for the pinch roll gap and roll diameter linkage is used to precisely quantify and superimpose control the gap of the pinch roll during the rolling process.

7. The system according to claim 6, characterized in that, The pinch roll tension current limiting visualization setting and command import control module includes a command import control unit, which is used for command transmission and command execution connection.

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