PURPOSE:To improve the quality and yield of molten steel and working efficiency by calculating deviation of charging rate, judging whether existence of abnormal spout is or not, controlling the charging rate so as to eliminate the deviation and restraining the charging rate at the time of detecting the abnormal spout. CONSTITUTION:The wt. variation of auxiliary material in charging hopper 4 is measured with charging weigher 5 and periodically inputted into control device 11. At the supply time, it is controlled so as to approach to zero in the deviation of the charging rate. Picture signal of monitoring camera 8 at furnace opening part is periodically inputted into the control device 11. At the time of judging what spouted material is much, the charging rate is made to low. At the time, when even by controlling the charging rate, the spout is not killed, hopper gate 6 is closed. By this method, the quality and yield of the molten steel and the working efficiency can be improved.
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