Rotary lead-through for the coolant inflow and outflow of a back-up and/or conveyor roller which is rotably held in a bearing arrangement at the end

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).