REFRACTORY COMPONENT FOR LINING A METALLURGICAL VESSEL
In a steel ladle used for handling molten steel, a precast ladle barrel ring forms part of a refractory structure that covers the bottom wall and side wall of the steel ladle. The precast ladle barrel ring is comprised of a monolithic annular ring formed of a high-temperature, cast refractory. The annular ring further includes means for positioning the precast ladle barrel ring in a steel ladle.
1 . A lifting device for lifting and positioning a precast ladle barrel ring into a steel ladle, said ring defining a generally cylindrical central cavity and having spaced-apart openings formed in an inner surface thereof communicating with said central cavity, said lifting device comprised of:
a rigid central frame having connection means connectable to a device capable of lifting and moving said frame;
a plurality of leg portions extending outwardly from said frame, said leg portions disposed on said frame to be in registry with said openings in said inner surface of said ring when said lifting device is disposed in said central cavity;
a movable lifter bar associated with each of said leg portions, each lifter bar being movable relative to an associated leg portion between a retracted position and an extended position wherein said lifter bar extends outward from said associated leg portion;
wherein said lifting device is positionable within said central cavity of said precast barrel ring when said lifter bars are in said retracted position; and
wherein said lifting bars extend into said openings in said ring when said lifting bars are in said extended position.
2 . A lifting device as claimed in claim 1 , wherein said leg portions are equally spaced from each other.
3 . A lifting device as claimed in claim 1 , wherein said each of lifter bars includes a flat, upward facing surfacing dimensioned to engage a downward facing surface defined by an opening in said ring.
4 . A lifting device as claimed in claim 1 , wherein said frame is symmetrical about a central axis.
5 . A lifting device as claimed in claim 4 , wherein said lifter bars extend radially outward from said central axis.
6 . A lifting device as claimed in claim 4 , wherein said lifter bars are reciprocally movable between said retracted position and said extended position radially from said central axis.
7 . A lifting device as claimed in claim 1 , wherein said frame is formed of structural steel.
8 . A lifting device as claimed in claim 1 , further comprising locking means for locking said lifter bars into said extended position.