AN APPARATUS FOR CONTROLLING GAS LAYER THICKNESS ON THE SURFACE OF CASTING ROLL IN TWIN ROLL STRIP CASTER

摘要

An apparatus for controlling gas layer thickness on the surface of casting rolls in a twin roll strip caster. The apparatus comprises: a pair of chambe rs (30) fixedly mounted on both lateral portions of the meniscus shield (9) in a width direction of a strip (6); blocking units (40) for blocking introductio n of pollutants into the molten metal pool (5), wherein each of the blocking units (40) includes front and rear barrier members (41 and 42), which are mounted on each of the chambers (30) and in close contact with an outer periphery of the each casting roll (1) or (1a), and a blower (45) for injecting inert gas toward the outer periphery of the each casting roll (1or 1a); operating units (50) for adjusting the thickness and the width of gas layers at both ends of the casting rolls (1 and 1a), wherein each of the operating units (50) includes suction lines (51) connected with the each chamber (30) to transmit suction force to ends of the each casting roll (1or 1a) and a pair of movable plates (52) slidably assembled to both side portio ns within the each chamber (30) for being reciprocated by movable members (55); and a control unit (60) for controlling the suction force of the suction lin es (51) and the movable members (55) by using means for measuring surface conditions and the thicknessof the strip (6). Delayed solidification at stri p edges is prevented to improve the grade in shape and yield of the strip.