Patent ID: 7165432

Claim:
Device for changing pairs of work rolls and/or pairs of backup rolls on rolling stands, wherein the backup rolls and the work rolls are each supported in chocks that can be raised or lowered in a mill housing frame, the pair of work rolls, supported on the chocks, being movable out by means of a linear actuator, and the pair of backup rolls being movable out or moved in by means of a lower backup roll supported on a track and wheels and by means of a roll changing frame, said roll changing frame being supported on the lower backup roll and itself supporting the upper backup roll, wherein the pair of work rolls ( 2 ) on the drive side ( 12 ) of the rolling stand ( 1 ) can be coupled with a hydraulic piston-cylinder actuator ( 7 a ) that is dimensioned in its stroke length for the removal or installation distance ( 13 ) and can be uncoupled when it has been withdrawn the required distance ( 14 ), comprising a roll changing frame ( 11 ) which, after having been moved in at a height level ( 15 ) between the backup rolls ( 3 a , 3 b ), can be coupled to the same piston-cylinder actuator ( 7 a ), and, when the upper backup roll ( 3 a ) and the roll changing frame ( 11 ) are supported on the lower backup roll ( 3 b ), the pair of backup rolls ( 3 ) can be moved out or moved back in, wherein the piston-cylinder actuator ( 7 a ) is coupled to a pusher ( 16 ) which has connecting arms ( 17 a , 17 b ) aligned with ends ( 8 ) of the rolls, and wherein the piston-cylinder actuator ( 7 a ) is arranged on the drive side ( 12 ) of the rolling stand ( 1 ) and is coupled to the pusher ( 16 ) with its piston rod ( 7 b ).