Roller with controllable deflection

Details Roller with controllable deflection Roller with controllable deflection

1997-12-01

1999-07-06

Hughes, S. Thomas

Roll or roller

With antideflection means

Rotatable relative to supporting shaft

492 16, 492 46, B21B 2700

Patent

active

059191210

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a roll of the type having bending control, in which a hollow rotating roll having an outer working surface can be bent. The roll is provided with a non-rotatable crossbeam which penetrates the roll lengthwise, and is supported at its ends against an outer bracing element. The crossbeam is offset with a radial clearance all around from the inner circumference of the hollow rotating roll. Mounted on the crossbeam is a series or row of supporting elements that can be actuated by a fluid pressurized medium, fed by a plurality of supply lines running from the ends of crossbeam through a central longitudinal recess in the crossbeam. These enable the pressurization by the pressurized medium of individual or a plurality of supporting elements jointly connected group-wise to a supply line. The supply lines are being combined to make a supply unit that forms an assembly closed upon itself and which, as an entity, is insertable into or removable from the longitudinal recess of the crossbeam.
In rolls of this general type, a row of approximately twenty to eighty supporting elements are usually distributed over the length of the roll, usually on the side of the roll nip. These supporting elements are constructed like piston/cylinder units and abut against the inner circumference of the hollow roll, with bearing pockets being formed in the contact surface which exert a hydrostatic pressure against the inner circumference of the hollow roll, and from which pressurized fluid constantly escapes over their boundaries, so that a load-bearing liquid film is maintained which prevents a metallic contact between the supporting element and the inner circumference of the hollow roll.
During operation, these supporting elements must be supplied with at least one fluid pressurized medium. This medium usually is a pressurized fluid, in particular a pressurized oil, which may also be used as a heat-carrier medium. However, it is also possible to use gas-driven, and especially air-driven supporting elements.
Examples of such rolls are described in the following patents: U.S. Pat. No. 3,119,324, DE 22 30 139 B2, U.S. Pat. No. 2,395,915, DE 36 40 902 C2 and DE 38 20 974 C2, the contents of which are incorporated herein by reference for these teachings.
In many cases, the supporting elements are combined to form a plurality of groups which receive the fluid pressurized medium, at a common pressure, and thus require only one supply line. The smaller the groups, the more supply lines must be present. When, in the extreme case, each supporting element is to be acted upon separately in order to influence the line force in a particularly sensitive manner, at least just as many supply lines must be present as supporting elements. Since the supply lines cannot have less than a certain minimum cross-section, because the supporting elements need a certain throughput volume for their proper operation, especially for the maintenance of the separating liquid film, the feeding of the pressurized medium to the individual supporting elements or groups of supporting elements presents a problem, because only a very limited cross-section is available for this purpose. The crossbeam, which sags inside the hollow roll under the line load given by the line force, must not be substantially weakened in its bearing cross-section if the roll is to be able to generate higher line pressures.
A first possibility for supplying the supporting elements is the subject matter of the German patent 24 07 510 B2, in which, at the location of each supporting element, a control valve is provided, by means of which an actuating pressure adjusted for each supporting element is formed, by reduction, from the pressurized fluid introduced through a central main channel. For example, the respective valve is remotely pneumatically operated. Thus, correspondingly many remote-control lines must again be accommodated, as well. The arrangement of a multitude of valves is costly, and the weakening of the cross-section is not inconside

REFERENCES:
patent: 1432645 (1922-10-01), Vaughan
patent: 2395915 (1946-03-01), Specht
patent: 3119324 (1964-01-01), Justus
patent: 3587152 (1971-06-01), Hold
patent: 3802044 (1974-04-01), Spillmann et al
patent: 3932921 (1976-01-01), Biondetti
patent: 3997953 (1976-12-01), Christ et al.
patent: 4047273 (1977-09-01), Biondetti
patent: 4090282 (1978-05-01), Lehmann
patent: 4292716 (1981-10-01), Marchioro
patent: 4307501 (1981-12-01), Ahrweiler
patent: 4747195 (1988-05-01), Snellman
patent: 4757582 (1988-07-01), Verkasalo
patent: 4919761 (1990-04-01), Schiel et al.
patent: 4984343 (1991-01-01), Schrors
patent: 5152041 (1992-10-01), Link et al.
patent: 5534117 (1996-07-01), Roerig
patent: 5599263 (1997-02-01), Haiko et al.
patent: 5645517 (1997-07-01), Stotz
patent: 5662571 (1997-09-01), Brandiser et al.

Affiliated with

Also associated with

Rating

Roller with controllable deflection does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Roller with controllable deflection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Roller with controllable deflection will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-895297