Hoisting mechanism for steel processing ladles in RH degassers

A hoisting mechanism for raising a ladle filled with liquid steel from a ladle transfer vehicle to immersion pipes of a vacuum treatment tank of an RH degasser, comprising:

• two lifting arms, wherein a first end of at least one of said lifting arms is associated with a hydraulic cylinder and each of said lifting arms comprises a receiving means located between the first end and a second bearing end of the respective lifting arm, the receiving means being adapted to be brought into engagement with a support device formed on said ladle, wherein the second bearing end of each of said lifting arms is supported in a stationary saddle support, wherein each saddle support comprises a runway, which is disposed on said second, bearing ends of said lifting arms and has the shape of a portion of a circular arc, and a path of rolling contact, which is adapted to axially fixedly guide said runway during a pivoting movement of both first ends of the actuated by the hydraulic cylinder, such that due to a shifting of a point of load introduction in said saddle support that occurs during the pivoting movement, horizontal movement of said ladle during the pivoting movement is reduced and compensated, and wherein said support devices are in the form of plates rotatably or pivotably supported on trunnions that project radially from opposite sides of said ladle, and wherein said each of said lifting arms is provided with a receiving means that extends under said plate in a positively or form-fitting manner.

A hoisting mechanism for raising a ladle filled with liquid steel from a ladle transfer vehicle to immersion pipes of a vacuum treatment tank of an RH degasser, comprising:

• two lifting arms, wherein a first end of at least one of said lifting arms is associated with a hydraulic cylinder and each of said lifting arms comprises a receiving means located between the first end and a second bearing end of the respective lifting arm, the receiving means being adapted to be brought into engagement with a support device formed on said ladle, wherein the second bearing end of each of said lifting arms is supported in a stationary saddle support, wherein each saddle support comprises a runway, which is disposed on said second, bearing ends of said lifting arms and has the shape of a portion of a circular arc, and a path of rolling contact, which is adapted to axially fixedly guide said runway during a pivoting movement of both first ends of the actuated by the hydraulic cylinder, such that due to a shifting of a point of load introduction in said saddle support that occurs during the pivoting movement, horizontal movement of said ladle during the pivoting movement is reduced and compensated, and wherein said lifting arms are lengthened beyond said saddle support to form an end that extends beyond said saddle support, and wherein said end that extends beyond said saddle support is provided with a counterweight.