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In a roll apparatus formed by a top roll and a hydraulically supported bottom roll, which together form a roll nip, additional piston/cylinder units that can lift the hollow cylinder near its working position closing the roll nip are provided at least at the ends of the hydraulically supported botto

In a roll apparatus formed by a top roll and a hydraulically supported bottom roll, which together form a roll nip, additional piston/cylinder units that can lift the hollow cylinder near its working position closing the roll nip are provided at least at the ends of the hydraulically supported bottom roll. Due to the geometric arrangement employed, this lifting function is operative only up to a predetermined position of the hollow cylinder relative to its crosshead, which is selected to be at a short distance before closure of the roll nip. The pressure in the piston/cylinder unit degenerates whenever the piston of the additional piston/cylinder unit is forced out of sealing contact with its respective cylinder when the predetermined position is reached.

대표청구항 ▼

A roll apparatus having a top roll and a hydraulically supported bottom roll defining a roll nip therebetween, said bottom roll comprising: a rotating hollow cylinder having an inner circumference and an outer working roll circumference; a stationary crosshead extending lengthwise through said hollo

A roll apparatus having a top roll and a hydraulically supported bottom roll defining a roll nip therebetween, said bottom roll comprising: a rotating hollow cylinder having an inner circumference and an outer working roll circumference; a stationary crosshead extending lengthwise through said hollow cylinder to form a surrounding clearance space with the inner circumference of the hollow cylinder; said hollow cylinder being supported for radial displacement, as a whole, in the active plane away from the crosshead to a working position in the roll nip; and at least one supporting element provided near each end of the hollow cylinder extending from the crosshead to abut the inner circumference of the hollow cylinder, each supporting element comprising a piston/cylinder unit including: a piston and a cylinder, said piston being sealingly and slidably received in said cylinder to close said cylinder up to a predetermined relative position of said piston and cylinder corresponding to a predetermined position of the hollow cylinder in the roll nip short of the working position, said cylinder opening after said predetermined relative position is reached; and a first hydraulic fluid supply line communicating with the cylinder whereby the piston/cylinder units move the hollow cylinder to the predetermined position short of the working position when hydraulic fluid is conducted to the cylinders.