| 摘要 |
PURPOSE:To make a same level for molten steel surfaces at starting of drawing by arranging plural spotted molten steel surface detectors at below position from each level sensor on plural molds and adjusting each nozzle opening in accordance with the time, which the molten steel surface passes. CONSTITUTION:The molten steel 2 is poured on dummy-bars 101, 121 in the molds 6, 26 from a tundish 3. The surfaces of the molten steel 2 ascended in the molds are detected in succession by surface fixed point detecting sensors 9, 29 and 8, 28, and surface detecting signal is transmitted to computing elements 10, 30 for calculating ascending speed and time of molten metal surface for each strand. The computing elements 10, 30 calculates the ascending speed of the molten steel surface and the time from pouring start to detecting time, to output the calculating value to each nozzle opening computing element 50. The computing element 50 calculates an opening correcting value in an opening adjusting device 4a, 24a, so as to come to suitable pouring rate in accordance with an input signals from the computing elements 10, 30 and the opening detector 5, 25 to output to servo-amplifier 11, 31. The servo- amplifier 11, 31 is worked to a driving cylinder b, 24b in accordance with this input signal and the input signal from the opening detectors 5, 25 to adjust flow rate of the molten steel 2 through the nozzles 4, 24.
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