| 摘要 |
PROBLEM TO BE SOLVED: To prevent the buckling or breakage without generating any excessive tension in a strip even when the line is stopped by setting the current command value for a drive motor of a helper roll to be zero when the master speed command value to command the strip carrying speed of the whole line does not exceed the set value. SOLUTION: In a speed controlling method for a helper roll in a continuous annealing line provided with a bridle roll and the helper roll for carrying a strip, the speed of all bridle rolls and all helper rolls is generally controlled so as to be a main speed command value (MRH) which is a specified speed value of the strip of the whole line. When the master speed command value (MRH) is decelerated in stopping the line and the speed reaches the lower limit speed v1 of the control limit of a motor speed control device to control the speed or under, the helper roll speed control is stopped, and the speed is set to be free. The helper roll is naturally rotated following the motion of the strip to prevent occurrence of any excessive tension between the bridle roll and the helper roll.
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