Strand guiding roller

1. A strand guiding roller comprising:

at least one roller shell having opposite first and second ends, a respective shaft recess having an inner lateral surface in each end of the roller shell;

a respective supporting shaft connected in a rotationally fixed manner at each end of the roller shell, a supporting bearing rotatably supporting each supporting shaft; the roller shell being connected in a rotationally fixed manner to the respective supporting shafts carrying the roller shell on both ends by shrink-fit connections or by press-fit connections; each supporting shaft comprising at least one shaft stub having an outer lateral surface which forms a shrink-fit connection or a press-fit connection with the inner lateral surface of the recess in a roller shell, the shrink-fit connection or press-fit connection producing a seal, wherein the shrink-fit connection or press-fit connection has a length of shrink fit for which the ratio of the length of the shrink fit to the diameter of the shaft is greater than 1, and further comprising the roller shell having a cylindrical outer surface;

at least one coolant channel passing through the roller shell and the at least one coolant channel is arranged radially inward from the cylindrical outer surface of the roller shell;

and substantially radial feed and discharge lines for a cooling medium pass through the shrink-fit connection between the supporting shaft and the roller shell.

2. The strand guiding roller as claimed in claim 1 , comprising a plurality of the roller shells arranged in a line in an axial direction, two neighboring ones of the roller shells are respectively connected in a rotationally fixed manner by a respective one of the supporting shafts, and the one supporting shaft is supported centrally by a respective one of the supporting bearings.

3. The strand guiding roller as claimed in claim 2 , wherein a coolant channel passes through the successive supporting shafts and roller shells which alternate in the axial direction.

4. The strand guiding roller as claimed in claim 3 , wherein the coolant channel is of a constant cross section and has a central orientation in the axial direction of the roller.

5. The strand guiding roller as claimed in claim 1 , further comprising a manifold sealing ring arranged between the roller shell and the supporting shaft, the shaft forms with the roller shell a coolant distributing line, into which the substantially radial feed or discharge lines and the axially parallel coolant channels run out, and the manifold sealing ring forming with the roller shell and with the supporting shaft a rotationally fixed shrink-fit connection or a press-fit connection.

6. The strand guiding roller as claimed in claim 1 , further comprising a cardan shaft connection of a driven strand guiding roller having a connecting element connected in a rotationally fixed manner to a respective supporting shaft supported centrally on a supporting bearing by a shrink-fit connection or by a press-fit connection.

7. The strand guiding roller as claimed in claim 1 , wherein the supporting bearings are movable bearings comprising rolling bearings having rolling elements which compensate for operationally induced axial displacements and alignment deviations (CARB bearings).

8. The strand guiding roller as claimed in claim 1 , wherein the at least one coolant channel is arranged at a constant distance in from the cylindrical outer surface of the roller shell.