Abstract: A socket installation structure of a refractory article is designed to prevent gas leakage therein. A first flange is provided between an outward end and an inward end of a socket, and a face of the first flange on the side of an inward end thereof is bonded to an article body of the refractory article through a sealing material. Further, a face of the first flange on the side of an outward end thereof faces a metal plate disposed around the outward end or a second flange provided on the side of the outward end, through a low thermally-conductive material layer made of a low thermally-conductive material having a thermal conductivity at room temperature of 40 (W/(m·K)) or less.

Abstract: A socket installation structure of a refractory article is designed to prevent gas leakage therein. A first flange is provided between an outward end and an inward end of a socket, and a face of the first flange on the side of an inward end thereof is bonded to an article body of the refractory article through a sealing material. Further, a face of the first flange on the side of an outward end thereof faces a metal plate disposed around the outward end or a second flange provided on the side of the outward end, through a low thermally-conductive material layer made of a low thermally-conductive material having a thermal conductivity at room temperature of 40 (W/(m·K)) or less.

Abstract: A floating seal (23) is provided between a mounting bracket (12) fixed to a side frame (6) and a roller (15) rotatable with respect to this mounting bracket (12), and lubricant oil (L) collected in the roller (15) is sealed by this floating seal (23). On the other hand, an air permeable plug (31) provided with an air permeable member (34) made of a porous material of interconnected cells is provided on a lid member (17) of the roller (15), air and/or water vapor is made to flow between the inside and the outside of the roller (15) and flow of lubricant oil (L) and/or rainwater and dusts is prevented by the air permeable member (34) of the air permeable plug (31). As a result, the pressure of the inside and the pressure of the outside of the roller (15) can be made equal all the time.

Abstract: A floating seal (23) is provided between a mounting bracket (12) fixed to a side frame (6) and a roller (15) rotatable with respect to this mounting bracket (12), and lubricant oil (L) collected in the roller (15) is sealed by this floating seal (23). On the other hand, an air permeable plug (31) provided with an air permeable member (34) made of a porous material of interconnected cells is provided on a lid member (17) of the roller (15), air and/or water vapor is made to flow between the inside and the outside of the roller (15) and flow of lubricant oil (L) and/or rainwater and dusts is prevented by the air permeable member (34) of the air permeable plug (31). As a result, the pressure of the inside and the pressure of the outside of the roller (15) can be made equal all the time.