Wire or felt forming section with breast rollers supported by hydrostatic bearings
AssigneeJ. M. Voith GmbH
InventorsHans-Peter Sollinger, Christian Schiel
Life of this patent
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Abstract
A wire or felt forming section of a paper-making machine has breast rollers for guiding a respective one of two forming wires. The two rollers are disposed with a pulp gap formed between the two rollers and the wires are disposed just downstream of a pulp suspension ejecting nozzle of a headbox. Each roller is supported against the respective taut forming wire by a hydrostatic bearing. The hydrostatic bearing has two circumferentially separated resiliency chambers provided in a combined region of resiliency disposed over an arc of the circumference of the roller. A sealing strip after the region of resiliency prevents fluid from contacting the wire.
Claims40
A wire or felt guiding arrangement for a web of fiber pulp suspension, comprising:
- a first and a second breast roller on respective opposite sides of a pulp suspension outlet from a headbox and defining a pulp gap between the rollers generally where the rollers are closest together;
- a respective taut wire or felt passing under tension partially around each roller and through the pulp gap so that the headbox suspension outlet ejects suspension between the wires or felts toward the pulp gap;
- means defining a respective hydrostatic bearing engaging an outer surface of each of the rollers and extending longitudinally in a cross-machine direction of the roller along the length of the roller for supporting each of the rollers against the tension exerted thereon by the respective wire or felt;
- each roller being biased against the hydrostatic bearing by at least one of gravity and the respective wire or felt under tension, each roller being positioned along its entire length by the hydrostatic bearing and by one or both of the force of its own weight and the tension provided by the respective wire or felt, thereby providing a continuous hydrostatic roller support over the entire roller length;
- each roller circumference forming a first arc disposed against the bearing substantially opposite a second arc of the circumference that the wire or felt engages.
The guiding arrangement apparatus as in claim 3, wherein at least the upper roller comprises a hollow cylinder.
A wire or felt guiding arrangement for a web of fiber pulp suspension, comprising:
- a first lower and a second upper breast roller on respective opposite sides of a pulp suspension outlet from a headbox and defining a pulp gap between the rollers generally where the rollers are closest together;
- a respective taut wire or felt passing under tension partially around each roller and through the pulp gap so that the headbox suspension outlet ejects suspension between the wires or felts toward the pulp gap;
- means defining a respective hydrostatic bearing engaging on outer surface of each of the rollers and extending longitudinally in a cross-machine direction of the roller along the length of the roller for supporting each of the rollers against the tension exerted thereon by the respective wire or felt;
- each roller being biased against the hydrostatic bearing by at least one of gravity and the respective wire or felt under tension;
- and further comprising:
- roller suspension means for preventing the upper roller from falling out of its bearing while the wire or felt is not present against the upper roller, said suspension means comprising a longitudinally extending means extending through the roller and having a surface that impacts against an inner surface of the upper roller when the longitudinally extending means begins to oscillate, thereby to suppress the oscillations.
Dependencies are inferred from the claim text.