FIELD: blast furnace handling equipment. SUBSTANCE: metal core is inserted into blast furnace outlet hole plug prior to complete hardening of mass. Later the core is withdrawn to open outlet hole. Core is inserted by means of jack, which provides sliding reciprocating movement of grip along column. Core is withdrawn by continuous backward motion of grip urged by first jack and high-power drive, such as second jack which urges first jack to move to rear part of column. EFFECT: increased efficiency, simplified construction and enhanced reliability in operation. 13 cl, 11 dwg , 1 tbl
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