CLOSING COMBINING REGULATING MECHANISM FOR TAPPING HOLE OF MOLTEN METAL FROM METALLURGICAL VESSEL

摘要

PURPOSE: To ensure the good sealness of a closing mechanism in the molten metal tapping port of a metallurgical vessel by mutually conforming the coefficients of thermal expansion in both refractory parts with each other at the closing parts of the molten metal tapping hole so as to develop an annular gap which prevents the penetration of the molten metal during pouring operation. CONSTITUTION: In the closing and regulating mechanism for tapping port of the molten metal from the metallurgical vessel, a fixed part 2 of fixed refractory portion and a rotary part 3 of rotary refractory portion, are provided. Cylindrical sealing surfaces 17, 18 in both parts 2, 3 are formed and mutually fitted. Then, the coefficients of thermal expansion in the fixed part 2 and the rotary part 3 of both refractory portions are mutually conformed with each other so as to develop the annular gap 19 for executing the clearance fitting which prevents the penetration of the molten metal during pouring operation. The annular gap is desirable to be 0.05-0.7 mm at a low temp. In this way, the good sealness of the closing mechanism in the molten metal tapping port of the metallurgical vessel can be guaranteed.