METHOD FOR AUTOMATICALLY CORRECTING GUTTER OF STRIP IN CONTINUOUS GALVANIZING LINE

摘要

PURPOSE: A method for automatically correcting gutter of strip in continuous galvanizing line is provided to perform plating operation better by reducing and preventing gutter of the strip during change of thickness and steel type of strip or change of tension or widthwise coating amount during on line. CONSTITUTION: The method comprises a step of outputting data of the intermesh amount as much as its difference into motor controller after comparing thickness of strip preestimated and set with an intermesh amount for carbon content in process control computer(36) in case that there are variations in steel type and thickness between welded preceding and following coils of the strip entering zinc pot; a step of outputting the data of the intermesh amount to the motor controller(31) by finding a preset intermesh amount for tension variation using instrumentation control computer(37) in case that line tension of the strip is changed; a step of controlling gutter of the strip by driving a motor(32) using the motor controller(31) through intermesh amount and distance data inputted in the respective steps and moving stabilizing roll(12) back and forth as much as the inputted data of the intermesh amount according to sensing signals of potentiometer(34) that is a distance sensor; and a step of controlling gutter of the strip again by computing a degree of gutter of the strip accordingly and transmitting the computed degree of gutter of the strip to the motor controller(31) if the calculated coating weight difference exceeds a certain value after calculating coating weight difference using coating gauge(38) in case that coating weight difference is generated in a width direction of the strip regardless of the gutter control in the above step.