Roll having means for determining pressure distribution

B - Operations – Transporting – 30 – B

Patent

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Details

B30B 3/04 (2006.01) B30B 15/00 (2006.01) D21F 3/06 (2006.01) D21G 9/00 (2006.01) G01L 5/04 (2006.01)

Patent

CA 2198471

A roll system (1) for use particularly in a papermaking press nip (10) for dewatering a fibrous web, comprising a roll (1) disposed so as to rotatingly cooperate with another roll (12) in a press nip (14), the roll (1) having a helical sensor (6) for sensing pressure exhibited on the roll (1), and transmitting pressure signals (20) to a processor (23) as the roll (1) rotates. Trigger signals (30) are generated at certain times as the roll (1) rotates, the time of the occurrence of the trigger signal (30) representing a specific location on the helical sensor (6). The pressure signals (20) are coordinated with the trigger signals (30), such that the pressure corresponds to the angular position of the roll (1) where it is sensed. The operator may thus be given a visual (24, 26) or audible (25) indication of the existence of non-uniformities in pressure sensed at various locations along the roll (1), thereby enabling corrective action to be initiated if necessary.

L'invention concerne un système de rouleau (1) prévu pour être utilisé dans une ligne de contact de machine à papier (10) pour enlever l'eau d'une bande fibreuse. Ce système comporte un rouleau (1) placé de manière à pouvoir entrer en rotation et coopérer avec un autre rouleau (12) au niveau d'une ligne de contact (14). Le rouleau (1) comporte un capteur hélicoïdal (6) pour détecter la pression exercée sur le rouleau (1) et transmettre des signaux de pression (20) à un processeur (23) lors de la rotation du rouleau (1). Des signaux de déclenchement (30) sont générés à certains moments lors de la rotation du rouleau (1), et le moment où le signal de déclenchement (30) est généré représente un emplacement spécifique sur le capteur hélicoïdal (6). Les signaux de pression (22) sont coordonnés aux signaux de déclenchement (30) de telle sorte que la pression correspond à la position angulaire du rouleau (1) où elle est détectée. L'opérateur reçoit ainsi une indication visuelle (24, 26) ou sonore (25) indiquant l'existence de pressions non uniformes détectées en divers emplacements le long du rouleau (1). Cela permet, si nécessaire, d'effectuer les corrections requises.

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