TIGHTENING AND UNTIGHTENING DEVICE FOR BEARINGS OF ROLLING MILLS

摘要

A tightening and untightening tool (20, 30) for a roll bearing assembly of a rolling mill, has a box-like body of toroidal shape with a central hole fitting around the cylindrical end part (6) of a back-up roll (1). It has drive keys (28) that slide into corresponding drive splines on the outside of the locknut (13) and a torque reaction slot (27) that fits over a reaction plate (14). The tool (20, 30) is provided with a hydraulic drive motor (31) for tightening the bearing locknut (13) against a thrust bearing (11).