摘要 |
PURPOSE:To provide energy economization by connecting hearth.roll groups installed in a soaking zone or/and overaging zone of a continuous annealing furnace by means of a carriage to constitute freely vertically movably said carriage and controlling the vertical movement of the carriage so as to adjust the loop of a steel strip thereby minimizing the change of the pass length in the stage of changing the operating speed. CONSTITUTION:Hearth rolls 11 are connected by a carriage 12 in the above- described zone 2 or overaging zone 4. The carriage 12 is constituted freely vertically movably. The vertical movement of the carriage 12 is controlled by an ordinary control device for driving. If it is supposed now that the carriage 12 is lowered as shown by, for example, an alternate long and two short dashes line, the time when a steel strip 10 exists in the zone 2 or the zone 4 increases. The heat pattern is therefore changed as shown by the broken line in the figure. Bridle rolls 13 are preferably provided in the inlet and outlet of the zone 2 or the zone 4 to regulate fluctuation in the tension on the strip 10 when the carriage 12 moves upward or downward. |