DEVICE FOR CONTROLLING PLASMA HEATING TO MOLTEN STEEL IN TUNDISH IN CONTINUOUS CASTING EQUIPMENT

摘要

PURPOSE:To control temp. of molten steel in a tundish to the desired temp. with good accuracy by detecting voltage and current of arc to control arc power so as to become constant at the time of heating the molten steel in the tundish with the plasma arc in continuous casting for the molten steel. CONSTITUTION:At the time of continuously casting the molten steel, the molten steel 14 in the tundish 13 is heated with arc in a plasma torch 10. In this case, the arc voltage of plasma torch 10 is detected with a voltage detector 4, and this signal is inputted into a current computing part 5 and the set current value obtd. by dividing the preset power beforehand inputted is inputted into a current control computing part 6, and in this control part 6, the set current value inputted from the current computing part 5 and the actually measured current value detected and outputted with a current detector 3 is comparison-calculated. The obtd. correct current value is outputted to a main control part 2 and the power supplied to the plasma torch 10 is controlled based on the correct current value inputted from the current control computing part 6 to control the temp. of molten steel 14 to the suitable temp. to continuous casting, and the continuous casting operation is stably executed.