A high-synchronous control method for the pressing system of a hot-dip galvanized skin pass machine
A technology of synchronous control and skin pass machine, which is applied in the direction of rolling force/roll gap control, etc., can solve the problems that cannot realize the high-precision synchronous action requirements of hydraulic cylinders, affect the efficiency of production and operation, and product quality, so as to avoid the reduction of rolls and rolls. Quickly open accidents, improve production efficiency and product quality, and improve the effect of synchronous control accuracy and response time
Active Publication Date: 2014-10-08
ANGANG STEEL CO LTD
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Problems solved by technology
[0005] Neither the position control method nor the rolling force control method introduced in the above literature can realize the high-precision synchronous action requirements of the hydraulic cylinder of the pressing system of the skin pass mill.
Therefore, accidents of rolling rolls and quick opening of skin pass mills still occur from time to time, which affect the efficiency of production and operation and the quality of products
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[0027] The present invention will be further described below in conjunction with accompanying drawing.
[0028] Step 1: Realization of the calibration function of the skin-pass pressing system:
[0029] 1.1 First obtain the initial conditions required for calibration, including: the value of the change in the roll diameter of the work roll and the backup roll and the thickness value of the strip steel in the frame;
[0030] 1.2. In the position control mode, fully open the roll gap and release the hydraulic cylinder to the bottom;
[0031] 1.3. Start to calibrate the position sensor, and realize the function of clearing the roll gap under the rolling force of 0.56MN.
[0032] Step 2: The system adds position tilt control mode compensation in single position control mode:
[0033] 2.1 as figure 1 , 2 , 5 shown. The original single-position control method mainly controls the proportional valve to drive the input of the hydraulic cylinder through the PID alone. However, due ...
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A high synchronizing control method of a pressing system of a hot galvanizing skin pass machine includes that a. the single position control mode is adopted in the inputting process of a hydraulic cylinder of the pressing system, and simultaneously position inclination control is added to serve as compensation measurers; b. the system switches the single position control mode into the single rolling force control mode and sets set values of two proportional valves on the operation side (OS) and the drive side (DS) to be 10% of full bias current when the work roll is contacted with belt steel and the rolling force is 0.5MN to enable the work roll to stably close a roll gap and avoid roll blocking accidents caused by instantaneous large action of the pressing system at the switching moment; c. the system adopts the single rolling force control mode in the normal working process, simultaneously increased rolling force differential control to enable independent rolling force control systems on two sides to reach high synchronization by means of rolling force differential control; and d. the system has the automatic demarcation function.
Description
technical field [0001] The invention belongs to the field of automatic control of metallurgical production, and relates to a method for controlling the synchronous action of a hydraulic cylinder of a pressing system of a skin pass machine. Background technique [0002] The cold-rolled hot-dip galvanizing line is one of the deep-processing production lines of cold-rolled sheets, and the skin pass mill is an important process equipment of the galvanizing line, and its HGC (hydraulic roll gap control) synchronous control feature has an Critical. At present, there are mainly two ways of HGC synchronous control of galvanizing skin pass machine at home and abroad: (1) closed-loop control with combined rolling force band tilt; (2) single rolling force without tilt control. Its representative control technology can be found in Document 1. "Control System of Hand-Dip Galvanizing Line Skin Finishing Machine" [Hebei Metallurgy, 2003, 135(3): 50-52.] and Document 2. "Continuous Hot Gal...
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IPC IPC(8): B21B37/58
Inventor 张岩王军生刘宝权费静秦大伟宋君孔伟东
Owner ANGANG STEEL CO LTD