| 摘要 |
A variable-crown roll for forming a nip with a counter-roll includes a rotatably mounted roll mantle and a fixed central axle situated within the roll mantle defining a space therebetween in which nip profile adjustment devices, such as hydrodynamic glide-shoes mounted on pistons, are provided. The roll mantle is journaled on the central axle which in turn is supported at its ends at points axially outside of the journaling points of the roll mantle. An annular member is provided between each of the end portions of the central axle within the mantle or an extension thereof. A bearing or bearings for journaling the roll mantle on the fixed central shaft is mounted at each end of the roll between a respective annular part and an end region of the mantle or an extension thereof. Hydraulic power devices are provided at each end of the roll between the annular part and the end portion of the central axle which act in the plane of the nip. The hydraulic power devices are loaded by pressurized fluid so that the nip formed by the variable-crown roll and its counter-roll can be opened or closed. Moreover, the hydraulic power devices apply forces to the ends of the roll mantle for equalizing the distribution of loading forces.
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