PURPOSE: To throw charge in an intended distribution state into a blast furnace by determining the deviation between the actual opening speed and set opening speed of a bell positioned in the lowermost stage, calculating the correction opening speed therefrom and correcting the next set opening speed with said speed.
CONSTITUTION: The opening time TSi and opening degree PSi of a large bell 2 for an optional number of batches are optionally set and are inputted to an input board 14 for setting and are stored into a furnace top sequence control device 12. The values (TSi, PSi) area successively drawn out in conformity with the batch progression of the furnace top sequence and are calculated and converted to the speed set value VSi of the large bell=PSi/TSi. On the other hand, the control device 12 determines the correction opening speed ΔVi by the prescribed equation in conformity with the batch progression of the furnace top sequence and corrects the speed set value VSi of the large bell by using the same. The large bell 2 operate in accordance with the control set value (VSi+ΔVi) and stops finally at the set open position PSi by receiving the limination by the collation and calculation with the pulse signal of a pulse transmitter 13.
MIYAZAKI YOJI
MATSUNAGA KATSUHIRO
