Roll or roller – With antideflection means – Rotatable relative to supporting shaft
Reexamination Certificate
2002-03-05
2004-09-28
Rosenbaum, I Cuda (Department: 3726)
Roll or roller
With antideflection means
Rotatable relative to supporting shaft
C492S006000, C492S016000, C492S020000
Reexamination Certificate
active
06796929
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application claims priority under 35 U.S.C. §119 of German Patent Application No. 101 10 695.5 filed on Mar. 6, 2001, the disclosure of which is expressly incorporated by reference herein in its entirety.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a self-adjusting deflection controlled roll comprising a rotating roll jacket, a carrier which passes axially through the roll jacket and which is rotationally fixedly held at its ends in racks, and at least one support member arranged at the carrier and exerting a support force on the inner side of the roll jacket in a pressing plane, with at least one axial end of the roll jacket or an axial continuation associated with this being rotatably mounted by at least one bearing on a non-rotating axial bearing sleeve of a bearing housing secured against rotation extending into the region between the roll jacket or the axial continuation and the carrier, said bearing housing being freely movable relative to the carrier substantially in the pressing plane perpendicular to the roll axis. A self-adjusting deflection controlled roll of this kind is known, for example, from EP-A-0 787 912.
2. Discussion of Background Information
Such adjustable deflection rolls are frequently used in practice in the pressing and smoothing sections of paper making machines, wherein they can in particular be designed as so-called self-adjusting rolls in which the roll jacket can be displaced by several centimeters relative to the carrier, in particular by the support members, in order to open and close the pressing jacket.
In the deflection controlled roll known from EP-A-0 787 912, the relevant bearing housing is guided outside the bearing sleeve in the pressing plane perpendicular to the roll axis at a guide ring rotatably held at the carrier and comprising a guide flange and rotatably and tiltably held at the carrier by a pivot bearing with a spherical bearing surface. The roll jacket can be secured against rotation at the carrier by guide members axially arranged between the bearing sleeve and a radial ring surface of the carrier.
SUMMARY OF THE INVENTION
It is the aim of the invention to provide an improved deflection controlled roll of the kind initially named. In this connection, among other things, a bearing which is as compact as possible and self-guiding as possible and an introduction of force which is as central as possible in the region of this bearing should be achieved.
This object is satisfied in accordance with the invention in that the roll jacket is radially supported at the carrier transversely to the pressing force plane via the axial bearing sleeve of a respective bearing housing and is axially fixed at the carrier at an axial end via a guide device radially provided between the bearing sleeve of the relevant bearing housing and the carrier and allowing both a tilting movement and a movement of the bearing sleeve substantially in the pressing plane perpendicular to the roll axis. In this connection, the guide device radially provided between the bearing sleeve and the carrier are preferably arranged in an axially central region of the bearing sleeve and/or centered relative to this bearing sleeve in an axial direction.
With this design, in particular an extremely compact, self-guiding bearing results in whose region a central force introduction is possible. Moreover, the bearing housing is always oriented in accordance with the roll jacket independently of the respective roll strain or roll deflection so that in particular no tilting can occur between the roll jacket and the bearing housing even with a more pronounced roll deflection. Jamming effects are practically precluded in the region of the guide device allowing a tilting movement. Both the radial guiding and the axial guiding of the roll jacket are ensured at the same time via the relevant transmission bearing.
The bearing sleeve is expediently also supported radially at the carrier transversely to the pressing plane via the guide means.
In a preferred practical embodiment of the deflection controlled roll in accordance with the invention, the guide device includes at least one guide member rotatably mounted in the bearing sleeve or the carrier about an axis perpendicular to the pressing plane, said guide member sliding as a follower in a guide provided at the carrier or at the bearing sleeve and being displaceably guided by this substantially parallel to the pressing plane perpendicular to the roll axis. In this connection, these guide devices can in particular include at least two follower-like guide members provided at opposing sides of the carrier and respectively cooperating with a guide.
The guide cooperating with a respective guide member can, for example, be formed at a counter-plate secured at the carrier or at the bearing sleeve.
The guide member rotatably mounted in the bearing sleeve or in the carrier can in particular be formed by a spigot with a collar or the like.
The roll jacket is advantageously axially fixed at the carrier at the axial end at the drive side via the guide means associated with a relevant bearing housing.
The roll jacket is advantageously supported radially at the carrier at the other axial end, preferably at the guide side, transversely to the pressing force plane via the axial bearing sleeve of a relevant bearing housing, but axially displaceable relative to said carrier. In this connection, the bearing sleeve of the relevant bearing housing is expediently radially supported at the carrier via at least two bearing members which are arranged at mutually opposing carrier sides and which are each rotatably mounted in the bearing sleeve or in the carrier about an axis perpendicular to the pressing plane. The bearing members rotatably mounted in each case in the bearing sleeve or the carrier about an axis perpendicular to the pressing plane can cooperate with a counter surface which is preferably formed by a counter plate secured to the carrier or to the bearing sleeve.
In a preferred practical embodiment of the deflection controlled roll in accordance with the invention, at least one piston in cylinder arrangement acting generally in the pressing plane perpendicular to the roll axis is provided radially between the bearing sleeve of a respective bearing housing and the carrier. In this respect, at least one piston in cylinder arrangement arranged at the support member side of the carrier and/or at least one piston in cylinder arrangement arranged at the opposite carrier side can be provided.
Such a piston in cylinder arrangement can in particular serve to relieve the roll jacket of the weight force acting outside the working width of the roll jacket and/or to load or relieve the respective jacket end in order to influence the pressing force distribution in the press nip by controlled pressure medium loading and/or to fix the roll jacket in place in a position raised by a counter roll by shutting off the pressure medium backflow from the piston in cylinder arrangement.
The bearing sleeve of a respective bearing housing can in particular be provided in the region of a carrier spigot which is narrowed relative to the axially central region of the carrier. The piston in cylinder arrangement can thus in particular be arranged between the narrowed carrier spigot and the bearing bush, where there is sufficient room available.
The piston of the piston in cylinder arrangement loading the bearing sleeve can comprise a relief chamber fed with pressure fluid at the side of the piston confronting the bearing sleeve, whereby the axial forces or friction forces which occur can be reduced. In this connection, the relief chamber can be fed via at least one capillary. The feeding of the relief chamber can take place via the pressure chamber of the piston in cylinder arrangement through the piston or from the side of the bearing sleeve.
The piston in cylinder arrangement can directly contact the inner side of the bearing sleeve or a shallow side of an intermediate member arranged betwe
Cuda Rosenbaum I
Greenblum & Bernstein P.L.C.
Voith Paper Patent GmbH
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