US 5,495,798 AGranted

Adjustable-crown roll

AssigneeValmet Paper Machinery Inc.

InventorsJuhani Niskanen, Kyo/ sti Uuttana

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Abstract

The invention concerns an adjustable-crown roll having a stationary roll axle which is supported on the machine frame by means of articulated bearings, and a roll mantle which is arranged to revolve on the axle. Hydrostatic loading members or an equivalent pressure fluid chamber or series of chambers are arranged in the space between the axle and the roll mantle. By means of the loading members or equivalent, the profile of a nip formed with a counter-roll of the roll is regulated. A support bushing arranged concentrically with the roll mantle is attached to one end of the roll mantle and revolves along with the roll mantle. A bearing is installed on the support bushing. The bearing receives axial forces from the roll mantle and transfers the same to the machine frame through the non-revolving bearing block or housing of the bearing. The bearing is arranged, in the axial direction, outside the roll, whereby the roll is suitable for use as a hot roll.

Claims20

Dependent claims

An arrangement for an adjustable-crown roll in nip-defining relationship with a counter-roll, comprising

a machine frame,
an adjustable crown roll comprising a stationary roll axle and a roll mantle arranged to revolve on said roll axle,
articulated bearings including respective non-revolving bearing blocks, said roll axle being supported on said machine frame by means of said articulated bearings,
loading members arranged in a space between said roll axle and said roll mantle and being fitted substantially in a plane of the nip defined by said variable-crown roll and said counter-roll, said loading members regulating the profile of the nip,
at least one support bushing attached to a respective end of said roll mantle and arranged concentrically with said roll mantle such that said at least one support bushing revolves along with said roll mantle,
a hydrostatic bearing coupled to said machine frame and to said at least one support bushing attached to said roll mantle, said hydrostatic bearing structured and arranged to receive axial forces from said roll mantle through said at least one support bushing and transfer said axial forces of said roll mantle to said machine frame,
said hydrostatic bearing including a non-revolving housing coupled to said machine frame and a hydrostatic pressure chamber situated between said at least one support bushing and said non-revolving housing.

4 more elements

An arrangement for an adjustable-crown roll in nip-defining relationship with a counter-roll, comprising

a machine frame,
an adjustable crown roll comprising a stationary roll axle and a roll mantle arranged to revolve on said roll axle,
articulated bearings including respective non-revolving bearing blocks, said roll axle being supported on said machine frame by means of said articulated bearings,
loading members arranged in a space between said roll axle and said roll mantle and being fitted substantially in a plane of the nip defined by said variable-crown roll and said counter-roll, said loading members regulating the profile of the nip,
a support bushing attached to each end of said roll mantle and arranged concentrically with said roll mantle such that said support bushings revolve along with said roll mantle, and
a pair of hydrostatic bearings coupled to said machine frame and to a respective one of said support bushings attached to said roll mantle, said hydrostatic bearings structured and arranged to receive axial forces from said roll mantle through said support bushings and transfer said axial forces of said roll mantle to said machine frame, said hydrostatic bearings including a non-revolving housing coupled to said machine frame and a hydrostatic pressure chamber situated between said support bushing and said non-revolving housing.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/139,938Filed 19 Oct 1993 · continuation
Priority: FI 9100807 Jan 1991
Granted: 5 Mar 1996
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

F16C 13/028
By fluid pressure: with a plurality of supports along the length of the roll mantle, e.g. hydraulic jacks
D21G 1/022
With deflection compensation means acting between the roller shell and its supporting member: the means using fluid pressure
D21G 1/0226
Rolls; Their bearings: bearings
F16C 13/02
Rolls, drums, discs, or the like ; Bearings or mountings therefor: bearings