| 摘要 |
Revolving drum has an external bearing ring, running on rollers having their axles mounted parallel to the drum axis in the bearing casing. These rollers are axially movable. Pref. the rollers together with their axles are axially displacable in the bearing casing and optionally are connected to a hydraulic piston-cylinder unit, which provides the axial movement. Additionally, the rollers may have edge flanges, which centre the bearing ring on them.
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