| 摘要 |
<p>PURPOSE:To improve the accuracy of a plate thickness by supressing the generation of offset deviation, at the time of proportionally controlling the position of a rolling-down cylinder in a hydraulic draft type rolling mill. CONSTITUTION:In a device 32 for controlling a hydraulic control valve, a command signal D3 for the position of a hydraulic control valve, which signal is formed from the deviation between a command signal D2 for operating a hydraulic control valve inputted from a device 30 for controlling the position of a rolling-down cylinder and a feed back signal F2 from a sensor 26 for the position of a hydraulic control valve, is inputted in a hydraulic control valve 22, controlling the position of the valve and the position of a rolling-down cylinder 16. At this time, the deviation between a command signal D1 for the position of the rolling- down cylinder, which signal is obtained by a comparator 34, and a signal F1 for detecting the position of the rolling-down cylinder is multiplied by a proportional gain function 38 by a multiplier 36, the resultant operating quantity (signal) for a proportional control is added by an adder 46 to an integral correction signal C, which is obtained by multiplying through a multiplier 44 an integral gain 48 by the integral value of the same deviation determined through an integrator 43, and the command signal D2 for operating a hydrulic control valve is formed in which the operating quantity at the time of the proportional control is corrected according to the integral value of a control deviation.</p> |
