| 摘要 |
PURPOSE:To accurately control steel tapping-off time and to fix molten steel temp. by comparing molten steel flow rate obtained by continuously weighing ladle weight with the optimum flow rate beforehand and moving vertically a bar-type stopper brick of the steel tapping hole. CONSTITUTION:The molten metal 8 is flowed out in a ladle 7 from the steel tapping hole 6 in a converter. The weight of this ladle 7 is continuously measured by a load-cell 9, to obtain the flow rate of molten steel 8. Comparison of this steel flow rate with the optimum flow rate determined beforehand from the steel tapping weight of the previous heat and the steel tapping-off time is calculated. Based on the calculation result, the bar-type stopper brick 5 positioned facing the steel tapping hole 6 is vertically moved through a vertical moving device and a linked arm 4, to change the gap between the stopper brick 5 and the steel tapping hole 6. In this way, the steel tapping flow is controlled, and also while detecting the slag mixing in the latter stage of steel tapping-off, the tapping-off time is controlled and the temp. of molten steel 8 poured into the ladle 7 is fixed to constant and the steel quality accompanying this is fixed to constant.
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