FI118777B - Vibration reducing arrangement for roller e.g. size press roller, in paper or cardboard processing machine, has disk attached to fastening ring over viscoelastic ring, and bearing vibration-isolating mass - Google Patents

Abstract

The arrangement has a cylindrical casing (1) and a front part with spindles for supporting a roller to a frame of a paper processing machine, where the front part is provided at opposite ends of the cylindrical casing. A fastening ring (2) is arranged in the casing, and a disk (4) is attached to the fastening ring over a viscoelastic ring (3). The disk bears a vibration-isolating mass (5). The viscoelastic ring consists of natural rubber, synthetic rubber or synthetic polymer material such as polyurethane. The disk consists of steel.

Description

f - 1 118777 Arrangement for Damping the Roll of a Paper / Board Machine or a Post-Processing Machine

The present invention relates to an arrangement for damping the vibrations of a paper / board machine or a post-processing machine comprising a tubular jacket and end portions at opposite ends provided with shaft pins to support the roll of the machine.

Such an inner hollow tubular shell roll is light compared to the closed roll 10. They are used in non-pin positions, e.g., guide, guide, and take-out rolls, or in nip positions, e.g., a coating or surface sizing station roll or a multi-roll calender intermediate roll. The sheath is typically made by casting, but it can also be made by welding a sheet of steel, for example. The sheath has a thickness of several tens of millimeters and requires 15 to always be machined. By machining, a sufficient circularity of the sheath can be achieved, but the vibration characteristics of the roll change, however, as the sheath thickness changes at different points along the sheath length.

US2004 / 0154479 discloses a prior art cushioning system in which a damping mass placed inside a roll is supported by a rubber ring on the roll. The rubber ring acts as both a spring and a damper / **; *. The problem is that the damping is based on the rubber ring compression ♦ · ♦: · γ tension / tensile properties which are not optimal for the damping power ♦ · ·.

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Accordingly, it is an object of the present invention to provide a damping system. • a control that allows the vibrations of the roll to be controlled in a relatively simple way. To achieve this object, the arrangement according to the invention is characterized in that the arrangement comprises a fastening ring 30 attached to the roll diaper and connected by a viscoelastic ring member which supports a damping mass. In the solution according to the invention «Shear stresses of rubber or similar viscoelastic material, 118777 2, which provide more effective damping than the prior art compression / tensile stress solution.

The invention will now be described with reference to the accompanying drawing, the sole figure of which is a schematic longitudinal sectional view of a part of a roll equipped with a damping arrangement according to the invention.

The damping arrangement according to the invention comprises a fastening ring 2 attached to the roll casing part 1, to which a steel plate 4 is attached via a ring 3 made of rubber or other viscous elastic material, to which a damping mass 5 is attached.

In this solution, the vibrations are transmitted through the shear forces of the rubber ring 3, thereby providing an effective damping of the vibrations. The rubber ring 15 3 can be secured to the steel plate 4 and the securing ring 2, for example by vulcanization or gluing.

The viscoelastic ring 3 may be natural rubber or synthetic rubber or a synthetic polymeric material, e.g. polyurethane.

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Claims (5)

118777 An arrangement for damping a vibration of a roll of a paper / board machine or a finishing machine comprising a tubular jacket (1) and end portions at its opposite ends provided with shaft pins for supporting the roll on the machine body, characterized in that the assembly includes a roll sleeve (1) 2) to which is attached via a viscoelastic ring (3) a plate part (4) which supports the damping mass (5). Arrangement according to Claim 1, characterized in that the viscoelastic ring (3) is made of natural rubber or synthetic rubber or of a synthetic polymeric material, for example polyurethane. Arrangement according to Claim 1 or 2, characterized in that the plate (4) is made of steel. Roll according to one of Claims 1 to 3, characterized in that the roll is a nip roll selected from the group consisting of a surface sizing roll, a coating roll and a multi roll roll calender. F1 ·· 20 Roll according to one of Claims 1 to 3, characterized in that the roll * · · is selected from the group consisting of a guide roll, a guide roll and an output roll. • · · * · · »» 1 * • 1 1 • · · 25 • · · · · · 1 · · · · · · · · · · · · · · · · · · · · · · · · „· »« ·· · 118777