Hydraulic fast locking and loosening device for bearing assemblies of rolling-mill cylinders, and corresponding method of use
AssigneeDanieli & C.Officine Meccaniche S.p.A.
InventorMarco Di Giacomo
Life of this patent
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Abstract
A hydraulic locking and loosening device (40) is set on the neck of a rolling-mill roll or back-up roll with a conical part (3) and a cylindrical part (4), and comprising an oil-film bearing (7, 8), a spacer ring (16), a thrust bearing (15), a thrust ring (17), and a threaded lock ring (18). The locking device (30) comprises a body (21) inserted at the centre in a ram (22) to form a hydraulic actuator with two annular chambers (23), longitudinal arms (31), on each of which is provided a C-shaped notch (32), and a cover (24) for closing the hydraulic chambers (23). A variant of the hydraulic locking and loosening device (40) is provided with a bayonet device for its engaging on the roll end.
Claims12
A roll bearing assembly comprising a roll with an end neck having a first portion (3), with a tapered external surface, and a second portion (4), at the external end of the roll neck, with a cylindrical external surface and adjacent to said first portion (3), and further comprising, from the internal end to the external end of the roll neck, an oil-film bearing (7, 8) fitted on said first portion (3), a spacer ring (16), a thrust bearing (15), a thrust ring (17, 57) and a threaded lock ring (18) fitted on said second portion (4), said thrust ring (17, 57) being provided with engagement means for releasably engaging a roll bearing locking and loosening device (30, 40) for locking and loosening operations.
Hydraulic locking and loosening device comprising a substantially cylindrical body (21, 41), a cylindrical ram (22, 42) provided with a central hole adapted to be set around said cylindrical body (21, 41) at a first ram end side, such as to form at least two annular hydraulic chambers (23, 43) in correspondence of the surface of reciprocal contact, a cylindrical end cap (24, 44) to close at least one of said hydraulic chambers (23, 43), and at least two longitudinal arms (31, 51′, 51″) extending in an axial direction towards a second ram end side, each of said longitudinal arms (31, 51′, 51″) being provided with releasable engagement means to releasably engage a roll bearing assembly for locking and loosening operations.
A method for loosening of bearing assemblies of the type according to claim 1 from a roll end by means of a hydraulic device (30) according to claim 54, comprising the following steps:
- a) assembling the hydraulic device (30, 40) on the end part of said roll (1);
- b) rotating the device (30, 40) about its own axis through an appropriate angle, to engage operatively engagement means (29, 53) located on said thrust ring (17, 57), thus fixing the device (30, 40) to the roll end;
- c) fixing the hydraulic device (30, 40) to the roll by actuating fixing means (26, 46, 47) on the roll end;
- d) loosening said lock ring (18) from the thrust ring (17, 57);
- e) opening of a chock end plate (13), releasing it from a flange (14);
- f) pressurising the hydraulic device (30, 40) by means of an actuator (23, 43), thus exerting an axial force and forcing said thrust ring (17, 57) away from said thrust bearing (15), freeing the chock and the oil-film bearing from the pressure on said roll neck (3);
- g) detaching said hydraulic device (30, 40) and said thrust ring (17) from said roll end;
- and
- i) extracting, in the following order from the neck (3, 4) of the roll (1):
- a thrust bearing (15), a spacer ring (16), a tapered sleeve (8), and a bushing (7).
Dependencies are inferred from the claim text.