| 摘要 |
PURPOSE:To exactly detect the level of the molten metal in a casting mold in a vacuum melting furnace by measuring the surface of the molten metal in the casting mold in said furnace through the peep window of the melting furnace by means of a linear sensor through the slit of a disk rotating in the furnace on the front face of the window. CONSTITUTION:The surface of the molten metal is observed by the linear sensor 5 through the peep window 1a of the vacuum melting furnace 1 in the stage of measuring the level of the molten metal in the casting mold 2 in the vacuum melting furnace 1 in a continuous casting installation using the vacuum melting furnace. The disk 3 having the long slit 3a in the diametral direction is rotated at a high speed on the front face of the peep window 1a to prevent the sticking of metallic vapor to the inside surface of the peep window 1a. The pulses in the bright and dark state projected to plural photodetectors provided to the linear array 5b of the linear sensor 5 are detected and the ratio between the bright part of the surface of the molten steel and the dark part of the casting mold part is detected therefrom, by which the surface position of the molten steel in the mold 2 is exactly detected. |
