| 摘要 |
PROBLEM TO BE SOLVED: To correctly detect any abnormal blow of an immersed lance caused by the breakage thereof without any constant monitoring or requiring any working skill. SOLUTION: In a method for detecting whether or not the blow is normally performed when the powder 1A fed from at least one pressure vessel 2A via a carrier gas is blown into a molten metal 51 in a torpedo 50 from a tip of the immersed lance 43, the vibration caused by blowing the powder 1A and the gas in the molten metal 51 from the tip of the immersed lance 43 is detected by an accelerometer 70 provided on a torpedo car 50a, and the abnormal blow of the immersed lance 43 is detected when the detected vibration is below the threshold of the vibration in the abnormal blow of the immersed lance 43 according to the powder blowing speed which is obtained in advance.
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