Method and apparatus for controlling tensions in a continuous steelstrip annealing furnace

摘要

Helper rolls in a continuous annealing furnace are divided by a master speed hearth roll serving as the boundary into a plurality of control blocks disposed forwardly and rearwardly of said master speed hearth roll, and the speed of rotation of said master speed hearth roll is used as a reference of speed. Tensions of a steel strip are continuously controlled on the basis of values detected by tension meter in said plurality of control blocks towards the inlet of the furnace for the helper rolls disposed forwardly of said master speed hearth roll and towards the outlet of the furnace for the helper rolls disposed rearwardly of said master speed hearth roll.