Hydrostatic self-loading controlled deflection roll

D - Textiles – Paper – 21 – G

Patent

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Details

D21G 1/02 (2006.01) F16C 13/00 (2006.01)

Patent

CA 2197665

A hydrostatic self-loading controlled deflection roll has a central, hydraulically operated shoe which extends substantially the entire cross-machine width of the rotating roll shell (1), and two outboard shoes (24, 26, 28, 30) disposed, in the cross-machine direction, outside of the nip loading zone. The use of the outboard shoes (24, 26, 28, 30) permits the use of a single, full-length nip shoe (3) within the nip loading zone, which simplifies control and provides for more uniform temperature distribution. The outboard shoes (24, 26, 28,30) also provide better crown control. The outboard shoes (24, 26, 28, 30) are preferably disposed within a head flange (17, 18) area of the roll, at the location where spherical bearings would normally be present in a conventional roll. A bearing ring is disposed axially outside of the head flange (17, 18) and around a portion of a bearing box at either end of the roll for rotatably supporting the roll shell about bearings in the bearing box. A barrier seal is disposed between the stationary roll shaft and the roll shell (1) intermediate the bearings and outboard shoes (24, 26, 28, 30).

Un cylindre auto-chargeur, hydrostatique, à déviation contrôlée, comporte un sabot central à actionnement hydraulique qui s'étend sensiblement sur la totalité de la largeur de la virole (1) du cylindre rotatif, dans le sens transversal de la machine. Il comprend également deux sabots extérieurs (24, 26, 28, 30) disposés dans le sens traversal de la machine, à l'extérieur de la zone de charge de contact. L'utilisation des sabots extérieurs (24, 26, 28, 30) permet d'avoir recours à un seul sabot de contact (3) sur toute la longueur de la zone de charge de contact, ce qui simplifie le contrôle et assure une répartition des températures plus uniforme. Les sabots extérieurs (24, 26, 28, 30) assurent également un meilleur contrôle de la cambrure. Les sabots extérieurs (24, 26, 28, 30) sont, de préférence, placés dans une zone formant bride de tête (17, 18) du cylindre, à l'endroit où se trouveraient normalement des paliers sphériques dans un cylindre traditionnel. Une bague de palier est placée, dans le sens axial, à l'extérieur de la bride de tête (17, 18) et autour d'une partie d'un boîtier de roulement à chaque extrémité du cylindre pour supporter en vue de sa rotation la virole de cylindre autour des paliers dans le boîtier de roulement. Un joint d'étanchéité formant barrière est placé entre l'arbre de cylindre fixe et la virole de cylindre (1) entre les paliers et les sabots extérieurs (24, 26, 28, 30).

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