Valmet Corporation

Metso Paper Inc.

Valmet Paper Machinery Inc.

Esa Lensu

Pekka Kivioja

Juha Lahtinen

Juhani Niskanen

Jori Onnela

Ari Lehto

Esa Salavamaki

Aki Mikkola

Esa Salvamaki

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

A method and apparatus for regulating the temperature in end areas of a roll mantle of a variable-crown roll provided with glide bearings and/or for compensating for an error in the diameter of the roll arising from thermal expansion. The roll mantle of the roll is supported adjustably on the roll axle by hydraulic loading elements loaded by a pressure medium and acting upon the inner face of the roll mantle at least in the direction of the nip plane. Further, the roll mantle is supported on the roll axle by hydraulic glide-bearing elements loaded by a pressure medium and arranged in the areas of the ends of the roll mantle. A fluid is supplied into the end areas of the roll and has a regulated temperature and/or flow so that it is possible to keep the temperature in the end areas of the roll mantle at a desired level, for example, substantially at the same level as the temperature in the middle area of the roll.

Method and apparatus for regulating the temperature in end areas of a

A method for providing a tubular roll mantle of a roll for a paper machine or equivalent with glide bearings and a roll including glide-bearings. The roll mantle is supported on a stationary roll axle by hydraulic glide-bearing members acting upon the roll mantle or upon the roll ends. The bearing members are loaded hydraulically by a pressure medium. The roll mantle is supported on the roll axle by at least one pair of glide-bearing members which acting radially and/or axially in opposite directions. When an outside force that shifts or attempts to shift the roll mantle in the direction transverse to the main loading direction and/or in the axial direction is applied to the roll mantle, the pressure in the glide-bearing member placed at the side of the higher loading is adjusted to a level higher than the pressure in the glide-bearing member acting in the opposite direction so that the outside forces are neutralized. In another embodiment, the roll mantle is permitted to be shifted over a certain distance in the main loading direction. When the roll mantle approaches its preset extreme position in this direction, the movement of the roll mantle is brake down, and finally the movement is stopped in its extreme position by the glide-bearing members.

Method for providing a roll mantle of a tubular roll for a paper machine

A method for providing a tubular roll mantle of a roll for a paper machine or equivalent with glide bearings and a roll including glide-bearings. The roll mantle is supported on a stationary roll axle by hydraulic glide-bearing members acting upon the roll mantle or upon the roll ends. The bearing members are loaded hydraulically by a pressure medium. The roll mantle is supported on the roll axle by at least one pair of glide-bearing members which acting radially and/or axially in opposite directions. When an outside force that shifts or attempts to shift the roll mantle in the direction transverse to the main loading direction and/or in the axial direction is applied to the roll mantle, the pressure in the glide-bearing member placed at the side of the higher loading is adjusted to a level higher than the pressure in the glide-bearing member acting in the opposite direction so that the outside forces are neutralized. In another embodiment, the roll mantle is permitted to be shifted over a certain distance in the main loading direction. When the roll mantle approaches its preset extreme position in this direction, the movement of the roll mantle is braked down, and finally the movement is stopped in its extreme position by the glide-bearing members.

Tubular roll for a paper machine or equivalent with glide-bearings

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Jyvaskyla, Finland

Esa Lensu