D - Textiles – Paper – 21 – G
Patent
D - Textiles, Paper
21
G
D21G 7/00 (2006.01) D21G 1/00 (2006.01) F16F 7/10 (2006.01) F16F 15/00 (2006.01)
Patent
CA 2287200
The invention relates to a method for damping vibration in a paper machine or in a paper finishing device by means of a dynamic damper which comprises an additional weight suspended from a vibrating object by means of a spring. In the method, the spring constant of the spring (3) of the dynamic damper and/or the mass (4) of the dynamic damper is/are changed by means of a control device (9) in order to tune the natural frequency of the dynamic damper. In an advantageous application of the invention, the vibration induced by rolls (1) which are in nip contact is damped by means of the damper so that the damper is tuned to a frequency that is substantially equal to a multiple of the rotational frequency of the roll that is closest to the natural frequency of the vibrating system. The invention also relates to an apparatus.
Cette invention se rapporte à un procédé permettant d'amortir les vibrations dans une machine à papier ou dans un dispositif de finissage du papier au moyen d'un amortisseur dynamique qui comporte un poids supplémentaire suspendu à un objet vibrant au moyen d'un ressort. Selon ce procédé, la constante de raideur du ressort (3) de l'amortisseur dynamique et/ou la masse (4) de l'amortisseur dynamique est/sont modifiées au moyen d'un dispositif de commande (9) servant à accorder la fréquence naturelle de l'amortisseur dynamique. Dans une application avantageuse de l'invention, les vibrations induites par les rouleaux (1) qui forment la ligne de contact, sont amorties par l'amortisseur de sorte que ce dernier est accordé sur une fréquence qui est sensiblement égale à un multiple de la fréquence de rotation du rouleau le plus proche de la fréquence naturelle du système vibrant. Cette invention se rapporte également à l'appareil mettant en oeuvre ledit procédé.
Hietamaki Erkki
Karhunen Jouko
Kolio Jorma
Lehtovirta Esa
Puranen Arto
Metso Paper Inc.
Sim & Mcburney
Valmet Corporation
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