Control method of cooling liquid for cold rolling strip steel

Abstract

The control method of cooling liquid for cold rolling strip steel includes: for the process computer to calculate the cooling liquid flow rate under the rated speed based on the friction and heat conductance in cold rolling; for the process computer to down send the cooling liquid flow rate during rolling; for the PLC to match based on the cooling liquid flow rate and the rolling speed and to apply the matched flow rate as the given value for controlling the valve; and for the PLC to calculate the control degree and opening of the valve, with the control degree being calculated based on the mathematical model. The present invention compensates the effect of pipeline, nozzle and other factors by means of the mathematical model to obtain the practical flow rate value and can raise the control precision of strip steel thickness.

Description

technical field [0001] The invention relates to a liquid flow control method, in particular to a cooling liquid flow control method for cold-rolled strip steel. Background technique [0002] Existing cold-rolled steel strip coolant (being emulsion) flow control method mainly comprises: calculate the coolant flow rate under rated speed by process computer according to the friction in the cold-rolled rolling and conduction calorific value; In the rolling mill, the process computer sends the coolant flow rate at the rated speed; PLC matches the cooling liquid flow rate at the rated speed issued by the process computer according to the rolling speed. The matching method is: [0003] F=F bas +(V-V min )÷(V set -V min )×F set [0004] F application traffic; [0005] f bas Basic traffic; [0006] f set Coolant flow at rated speed; [0007] V current rolling speed; [0008] V set Maximum rolling speed; [0009] V min Minimum rolling spe...

AI Technical Summary

Problems solved by technology

Since the control degree of the control valve is calculated according to the ratio of the control given value of the control valve to its maximum flow, however, during debugging, we found that due to the influence of pipelines, nozzles and other factors, the control degree of the cooling control valve does not It is proportional to the measured value of the flow rate, and the deviation of the flow rate will cause deviations in the oil film and cooling after the rolling speed is changed, resulting in strip thickness fluctuations and affecting the strip thickness control accuracy