Arrangement for attenuating vibration of a roll assembly

B - Operations – Transporting – 65 – H

Patent

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Details

B65H 16/06 (2006.01) B65H 18/02 (2006.01)

Patent

CA 2652877

An arrangement of attenuating the vibration in a roll assembly of a fiber web machine, in which assembly the roll (10) being rotatably suspended at its end on bearings in bearing housings (13a, 13b), and the bearing housings being supported on the frame or the foundation of the machine via viscoelastic intermediate piece or pieces (21a, 21b). According to the invention the loss factor of the intermediate piece is greater than 0.1 at the normal operating conditions of the roll at a frequency range, which is ±10 % calculated from the lowest bending eigenfrequency of the roll, and in the each end of the rolthe spring constant of the total influence of the intermediate piece or pieces is in the range of 0.04 GN/m - lGN/m.

La présente invention concerne un agencement pour atténuer la vibration dans un ensemble rouleau d'une machine rotative à toile fibreuse. Dans ledit assemblage, le rouleau (10) est suspendu de façon rotative au niveau de son extrémité sur des paliers dans des corps de palier (13a, 13b), et les corps de palier sont supportés sur le cadre ou la fondation de la machine par l'intermédiaire d'une pièce ou de pièces viscoélastiques intermédiaires (21a, 21b). Selon l'invention, le facteur de perte de la pièce intermédiaire est supérieur à 0,1 dans les conditions normales de fonctionnement du rouleau dans une plage de fréquence qui est calculée à ± 10 % à partir de la fréquences propre de flexion la plus basse du rouleau, et dans chaque extrémité du rouleau la constante de rappel de l'influence totale de la pièce ou des pièces intermédiaires est dans la plage allant de 0,04 GN/m à 1 GN/m.

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