Roll or roller – With antideflection means – Rotatable relative to supporting shaft
Patent
1992-02-06
1993-03-02
Eley, Timothy V.
Roll or roller
With antideflection means
Rotatable relative to supporting shaft
100162B, 492 5, B21B 1302
Patent
active
051897768
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates generally to a roller and more particularly to a roller for compressing webs of material.
Such a roller is known from DE-A-29 07 761. There, the sealing members move out during operation and displace the hollow roller relative to the crosshead, until a force equilibrium is achieved. The position which results in this case is indefinite.
However, there is a need for positioning of the sealing members, i.e. of the hollow roller relative to the crosshead, in many cases, for example if a roller is supposed to work in a calander, with a hollow roller freely movable in the plane of effect, radially relative to the crosshead, as the bottom roller. Without positioning, the position of the hollow roller would be dependent only on the forces, and in an extreme case, the bent crosshead could come to rest on the inside circumference of the rotating hollow roller.
Therefore, controls have already been developed for positioning of the hollow rollers which are freely movable in the plane of effect, which act on support elements comparable to the sealing members (DE-B-28 49 253, DE-A-30 26 865), or on external force members which engage on the crosshead (DE-A-29 43 644). In these embodiments, however, the detour of an external regulation is taken, which is connected with a correspondingly reduced response sensitivity and significant additional expenditure.
The reference DE-C-38 05 323 indicates a direct influence on the extension movement, effective by the structure of the individual sealing member. However, this involves a sealing member of a different type, namely a support element with a throttled passage from the cylinder chamber to the bearing pocket. When the extension is too great, the sealing member releases deflection channels, which causes the pressure to collapse. The known support element therefore only serves for the purpose that in an emergency, a limit position is not exceeded from one side. This embodiment is not suitable for positioning purposes, i.e. for maintaining a certain position. This is also true because the pressure is changed when the position influence occurs, which is not allowed to happen for positioning during operation.
The invention is based on the task of allowing positioning of the hollow roller relative to the crosshead, in the plane of effect, in a direct way and without significant additional expenditure.
SUMMARY OF THE INVENTION
This task is accomplished by the invention reproduced in claim 1.
When the stop has been reached, the sealing member is mechanically held in place and cannot move out further. This results in the positioning. However, the pressure fluid passed to the cylinder chamber still reaches the bearing pockets, via the passages, and forms the hydrostatic pressure cushion there. In practice, rollers of the type in question are not controlled only with regard to the line force distribution, but also with regard to the temperature distribution. For reasons of uniform heat transfer to the inside circumference of the hollow roller, the amount flow of the pressure fluid passed to the bearing pockets is therefore very predominantly kept constant. Thus, the same amount of fluid always overflows at the edges of the bearing pockets. If the line force in the roller gap becomes greater, the gap at the edge of the bearing pockets becomes narrower, and the pressure increases, while the amount passing through remains the same. If the line force decreases, the pressure fluid in the bearing pockets is able to raise the hollow roller slightly, which causes the gap at the edge to become greater and allows the pressure fluid to flow off more easily. The pressure in the bearing pockets decreases slightly as a result. Finally, for every condition in the roller gap, a corresponding equilibrium occurs at the edge of the bearing pockets.
At a hydraulic support device of a general type, stops to limit the extension are known from FR-A-23 34 002. However, the hydrostatic bearing pockets of the piston-like sealing members are supplied from thr
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Eduard Kusters Maschinenfabrik GmbH & Co KG
Eley Timothy V.
Martin C. Richard
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