| 摘要 |
PURPOSE: A control method of process tension at a vertical continuous melting plating facility is provided, which can control strip tension by a set tension evenly throughout the whole region from a zinc plating pot to a temper press mill, and so can greatly reduce quality inferiority such as the pinch tree and deviations of plated amount caused by variations of strip tension that are resulted from restrictions of each roll and liquid. CONSTITUTION: The control method is as follows: (i) tension control system consists of a plating pot (1), cooling tower, a temper pass mill (3), a turn around roll (4), a tension meter (5), a tension control roll (6), a water quenching facility (7), an air knife and a tension roll (11); (ii) compare tension feed back value (TF) of the tension meter (5) and set value (SV1) and set the difference as a tension correction value; (iii) actuate the thyristor (THY) by the correction value (the signal) to start a DC motor (13) for controlling the speed of the tension control roll (6), thereby compensate the speed of helper roll to control tension; and (iv) control the tension of strip (10) by adding the position correction value of a tension equalizing device (12) and the tension correction value.
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