Roller press with a device for the relief of the pressure roll

Details Roller press with a device for the relief of the pressure roll Roller press with a device for the relief of the pressure roll

1988-04-26

1989-06-13

Simone, Timothy F.

Presses

Automatic or material triggered control

Of roll separation or speed

72245, 100 50, 100 53, 100163A, 100170, 1623601, B30B 1516

Patent

active

048381560

ABSTRACT:
A roller press has a press roll and at least one pressure roll applying pressure to it. In the end region of each pressure roll, there is an associated positioning cylinder. The positioning cylinders relieve the pressure of the pressure roll against the press roll automatically upon an impermissible increase in the operating pressure in the positioning cylinder. For this purpose, each positioning cylinder has a safety valve which is operated either by the working fluid in the positioning cylinder to the pressure relief condition or by an electrical signal, in different embodiments, to relieve pressure in the positioning cylinder. The safety valves are coupled to each other by a signal line. When one safety valve relieves one positioning cylinder, all of the positioning cylinders are relieved. Details of the working fluid operated safety valves and of the electrically operated safety valves are disclosed, including details of the valve body and the application of pressures upon the valve bodies which causes them to shift.

REFERENCES:
patent: 2605108 (1952-07-01), Stephens
patent: 2750986 (1956-06-01), Russell et al.
patent: 2855829 (1958-10-01), Allemann
patent: 2869437 (1959-01-01), Hornbostel et al.
patent: 3515637 (1970-06-01), Reynolds et al.
patent: 3645285 (1972-02-01), Miyazaki
patent: 4113079 (1978-09-01), Wright
patent: 4197158 (1980-04-01), Johnson
patent: 4212504 (1980-07-01), Krylov et al.
patent: 4597326 (1986-07-01), Tapani
patent: 4620477 (1986-11-01), Ripani et al.
patent: 4632325 (1986-12-01), Feyerl et al.
patent: 4770094 (1988-09-01), Schiel

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