Method for detecting contamination and/or damaging of a face...

D - Textiles – Paper – 21 – G

Patent

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Details

D21G 1/00 (2006.01) G01H 1/00 (2006.01)

Patent

CA 2310068

The invention concerns a method for detecting contamination and/or damaging of a face (10) that runs through a nip or nips (N1...N10) in a calender for paper. In the method vibrations occurring in connection with the constructions (18, 100) of a calender are detected and processed. The vibrations are detected by means of at least one vibration detector (40; 41...46; 41a...46a, 41b...46b) fitted in connection with the bearing supports of calender rolls (11...16) or in connection with constructions (18, 100) related to said bearing supports. By means of these vibration detectors the calender roll(s) (11...16) is/are identified from which the vibration derives. In the method, it is possible to observe the rotation of all of the rolls to be monitored and to measure vibration from any suitable point whatsoever, for example from the frame (100) of the machine, by employing at least one vibration detector (40), the time (T r) of the cycle of the vibration signal obtained from said detector(s) being compared with the numbers of revolutions of the rolls to be monitored. In this way, the source of the disturbance is determined, and action is taken in order to eliminate the disturbance.

L'invention concerne un procédé de détection d'impuretés et/ou d'endommagement d'une face (10) qui passe à travers une ligne de contact ou des lignes de contact (N1...N10) dans une calandre pour papier. Selon le procédé, on est en mesure de détecter et traiter les vibrations découlant des constructions (18, 100) d'une calandre. On détecte les vibrations à l'aide d'au moins un détecteur de vibrations (40; 41...46; 41a...46a; 41b...46) en connexion avec les supports des rouleaux de calandre (11...16) ou en connexion avec les constructions (18; 100) liées auxdits supports. Ces sont les détecteurs de vibrations qui permettent d'identifier le(s) rouleaux(x) de calandre (11...16) à l'origine des vibrations. Selon le procédé, on peut observer la rotation de tous les rouleaux à surveiller et mesurer les vibrations à partir de tout point convenable, par exemple à partir du châssis (100) de la machine, à l'aide d'au moins un détecteur (40) de vibrations, de la durée (Tr) du cycle du signal de vibration obtenue à partir dudit(desdits) détecteur(s) en comparaison avec les nombres de révolutions des rouleaux à surveiller. Ainsi, on détermine l'origine de la perturbation et on peut prendre les mesures adéquates pour remédier au problème.

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