Patent ID: 7152660

Claim:
A rotary lead-through for the coolant inflow and outflow of a back-up and/or conveyor roller ( 1 ) which is held in a bearing arrangement at the end at least by means of bearing journals ( 10 ) located in bearing blocks ( 11 ), in particular in a continuous casting plant, comprising a covering plate ( 12 ) which covers at least one of the bearing journals ( 10 ) at the end, wherein said covering plate ( 12 ) is supported by the associated bearing block ( 11 ), wherein coolant lines are connected to said rotary lead-through, and comprising a seal ( 18 ) which acts between the bearing plate ( 12 ) and the bearing journal ( 10 ), which seal ( 18 ), together with a sleeve ( 16 ) inserted in the cover plate ( 12 ) so as to be sealed, makes possible relative rotary movement between the covering plate ( 12 ) and the bearing journal ( 10 ), and comprising a line ( 5 ) for coolant inflow and outflow, wherein said line ( 5 ) extends through an axial borehole ( 4 ) in the back-up and/or conveyor roller ( 1 ), wherein said line ( 5 ) for coolant inflow and outflow, together with the borehole ( 4 ) and the sleeve ( 16 ), forms a ring channel ( 7 ) for coolant inflow and outflow, characterised in that the bearing ( 9 ) at one end is a fixed axial bearing, while the bearing adjacent to said bearing ( 9 ) is a detached axial bearing; in that the sleeve ( 16 ) has been inserted into the bearing journal ( 10 ) so as to be sealed at one end and so as to be axially fixed; and in that on the other end of the sleeve ( 16 ), which end has been inserted in the covering plate ( 12 ), the seal ( 18 ) is seated which is effective between the bearing journal ( 10 ) and the covering plate ( 12 ), which seal ( 18 ), as a rotary shaft sealing ring, provides sealing action to the sleeve ( 16 ) and is sealed and axially fixed in the covering plate ( 12 ).