Metso Paper Inc.

Aki Mikkola

Pekka Kivioja

Kari Holopainen

Jorma Snellman

Jori Onnela

Ari Lehto

Juha Lahtinen

Esa Lensu

The invention relates to a method for providing a roll ( ) for a paper machine with sliding bearings, the roll comprising a stationary roll axle ( ) and a tubular roll mantle ( ) arranged to revolve around it. In the method, the roll mantle ( ) is supported on the roll axle ( ) by means of hydraulic sliding bearing members ( ) which are arranged to accomplish radial fitting with bearings of the roll mantle in the loading direction and in the lateral direction with respect to it, and the axial fitting with bearings of the roll mantle. The sliding bearing members are loaded by means of a hydraulic medium, the feed of which to the sliding bearing members is controlled by means of control valves ( ). In the method relating to the invention, when loading (F) is applied to the sliding bearing member ( ) effective in the loading direction, the loading force applied to the sliding bearing member ( ) subject to an external load due to the loading is compensated for automatically, essentially immediately, without an external control instruction, by means of the movement of the control valve ( ) stem ( ) of the sliding bearing member ( ) subject to loading, the said control valve ( ) bringing about a rapid increase in the pressure of the hydraulic medium in the sliding bearing member ( ) subject to the external load, at the same time as the pressure of the medium supplied to the sliding bearing member ( ) located radially on the opposite side of the roll axle ( ) in the loading direction is adjusted to a certain minimum value, whereby the bearings of the roll mantle are rendered so as to be essentially without stroke. The invention also relates to a roll for a paper machine which is provided with sliding bearings.

Method for providing a roll for a paper machine with sliding bearings and a roll for a paper machine with sliding bearings

The invention relates to a slide shoe assembly for a roll ( ) in a paper/board machine or a finishing machine, said roll ( ) comprising a stationary axle ( ), around which is rotatably mounted a cylindrical roll shell ( ), a clearance ( ) formed between the axle ( ) and an inner surface ( ) oF the roll shell ( ) being fitted with loading elements ( ) operated by a pressurized hydraulic fluid and provided with slide shoes ( ) which are loadable against the inner surface ( ) of the roll shell ( ) for controlling the distribution of a nip pressure in a nip (N) established with a counter roll ( ). According to the invention, the loading element is equipped with means capable of eliminating or compensating for a nip-load induced deflection of the roll shell and/or a deflection of the slide shoe caused by the pressure of a hydraulic medium, thereby eliminating the harmful effects caused by said deflections on an oil film between the loading shoe and a cylindrical surface supported thereby.

Slide shoe assembly for a roll in a paper/board machine of a finishing machine

Growing community of inventors

Lappeenranta, Finland

Aki Mikkola