Deflection compensating roll and method of use thereof

Details Deflection compensating roll and method of use thereof Deflection compensating roll and method of use thereof

1999-05-25

2001-05-08

Rosenbaum, I Cuda (Department: 3726)

Roll or roller

With antideflection means

Rotatable relative to supporting shaft

C492S016000, C492S020000

Reexamination Certificate

active

06228009

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a deflection compensating roll and method of use thereof, and more particularly, to a deflection compensation roll with a carrier that is held nonrotatably in outer bearings and passes through a rotatable roll shell and supports the latter by interposed hydrostatic support devices.
2. Description of Background Information
German Patent No. DE 25 10 410 C3 discloses a deflection compensating roll having a control apparatus that acts on pressure control valves in the feed lines to the hydrostatic support devices and to the piston/cylinder units. When the line load is changed by hydrostatic support elements, the bearing forces in the outer bearings must also be readjusted using the hydraulic piston/cylinder units. The readjustment is minor, normally ranging between approximately 0-10% of the applied line load. The unavoidable friction between piston and cylinder results either in an imprecise pressure setting of the outer bearings, or the pressure can only be precisely set with great effort.
German Patent No. DE 39 09 911 C1 discloses a measurement device for ascertaining the bearing stress on an inner bearing between the roll shell and the carrier of a deflection compensating roll. Pressure fluid pockets are provided on opposite sides of the bearing axis on at least one bearing surface. These pressure fluid pockets are supplied through a restrictor with pressurized fluid which passes through the gap formed between the bearing surfaces to an outlet. The pressures of these pockets are considered “sensor measurement values.”
SUMMARY OF THE INVENTION
The present invention provides a deflection compensating roll and method of use thereof. The deflection compensating roll of the present invention roll has a carrier that is nonrotatably held by an outer bearing and is disposed within a roll shell. The present invention also includes a plurality of hydrostatic support devices arranged about the outer surface of the carrier that support the roll shell. Also included is a hydraulic piston/cylinder unit having an actuating element, the outer bearing supported on the actuating element, and the actuating element adapted to force the outer bearing toward a mating roll. A bearing surface intermediate the outer bearing and the actuating element is present, and at least one pocket located opposite the bearing surface and having a surrounding rim is also present. The pocket is connected by a restrictor to a pocket pressurized fluid source, and a gap is present intermediate the bearing surface and the rim, the pocket being further connected by a gap to an outlet.
An inner bearing may be present at each end of the roll shell that functions to support the roll shell. Additionally, a control device adapted to control the pressure supplied to the support devices in zones may be provided.
A feature of the invention provides a catch basin surrounding the surrounding rim, with the outlet exiting from the catch basin.
According to another feature of the invention the restrictor may be adjustable.
Furthermore, a check valve that bypasses the restrictor may be provided, the check valve opening in a direction toward the pocket pressurized fluid source.
A pressure chamber present within the piston/cylinder unit may be provided, along with a piston pressure source adapted to supply the pressure chamber with pressurized fluid, as well as a shutoff valve that connects the pressure chamber to the piston pressure source.
Additionally, a pressure accumulator adapted to be connected to the pressure chamber may be provided, as well as a changeover valve adapted to charge the pressure chamber with fluid from the piston pressure source, and a container adapted to accept fluid from the pressure accumulator.
The method of applying a deflection compensating roll toward a mating roll includes forcing the outer bearings toward the mating roll by actuating the actuating element of the hydraulic piston/cylinder unit.
In another feature of the invention, the pressure supplied to the support devices may be controlled in zoned by using a control device. Additionally, the restrictor may be adjusted.
The method may additionally comprise bypassing the restrictor with a check valve in a direction toward the pocket pressurized fluid source. The method may also comprise connecting the pressure chamber of the piston/cylinder unit to a piston pressure source via a shutoff valve.
A further feature of the method comprises connecting a pressure accumulator to the pressure chamber and charging the pressure chamber with fluid from the piston pressure source via a changeover valve. Further, the method may additionally comprise discharging fluid from the accumulator into a container.
Other exemplary embodiments and advantages of the present invention may be ascertained by reviewing the present disclosure and the accompanying drawings.


REFERENCES:
patent: 3887245 (1975-06-01), Rouch
patent: 3909080 (1975-09-01), Hällnor et al.
patent: 4023480 (1977-05-01), Biondetti
patent: 4856154 (1989-08-01), Nikulainen et al.
patent: 5254070 (1993-10-01), Callhoff
patent: 5928121 (1999-07-01), Stotz et al.
patent: 3022491 (1981-12-01), None
patent: 2510410 (1982-03-01), None
patent: 3909911 (1990-06-01), None

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