초록 ▼

A pressure control device for processing machines having at least one roll which has a stationary core around which a hollow roll which forms the roll proper revolves with radial spacing from the core, the hollow roll supported at its ends on the core and supported on the core in between in the radi

A pressure control device for processing machines having at least one roll which has a stationary core around which a hollow roll which forms the roll proper revolves with radial spacing from the core, the hollow roll supported at its ends on the core and supported on the core in between in the radial direction by a fluid pressure medium disposed in a chamber formed at the core, the fluid pressure medium generating a force acting on the inside of the hollow roll to provide the operating pressure of the roll, with a loading device operated by a fluid pressure medium also applied either to the roll or a counter-roll, either the loading device or roll forming a controlling element, with a control pressure which is derived from the pressure prevailing therein used to adjust a pressure in the other controlled element which has a definite predetermined pressure ratio to the pressure in the controlling element, which pressure control device includes a pressure ratio monitoring device having as inputs the control pressure and the actual pressure in the controlled element and compares the inputs and, if the pressure in the controlling element becomes to high relative to a predetermined pressure ratio, reduces the pressure to the controlled element in order to reestablish the desired predetermined pressure ratio.

대표청구항 ▼

A pressure control device for processing machines having at least one roll which has a stationary core, around which a hollow roll which forms the roll proper revolves with radial spacing from the core, the hollow roll supported at its ends on the core and supported on the core in the radial directi

A pressure control device for processing machines having at least one roll which has a stationary core, around which a hollow roll which forms the roll proper revolves with radial spacing from the core, the hollow roll supported at its ends on the core and supported on the core in the radial direction by a fluid pressure medium which is disposed in a chamber formed at the core, the fluid pressure medium generating a force acting on the inside of the hollow roll and thereby generating the operating pressure of the roll; a counter roll supported in opposition to said roll with a stationary core, one of said rolls being supported in a stationary manner; a loading device which is operated by a fluid pressure medium supporting the other of said rolls so as to apply a pressure thereto, said roll with a stationary core around which a hollow roll is disposed and having a chamber for a fluid pressure medium and said loading device, respectively, forming first and second pressure controllable devices, comprising: (a) means to supply a predetermined pressure to one of said pressure controllable devices said device thereby becoming a controlling element; (b) means to derive from the pressure prevailing in said controlling element, a control pressure; (c) means having said control pressure as a control input for adjusting a pressure in the other of said pressure controllable devices, which is in a definite predetermined pressure ratio to the pressure in the controlling element, said other pressure controllable device thereby becoming a controlled element; (d) means for measuring the actual pressure in the controlled element; and (e) a pressure ratio monitoring device having as inputs said control pressure and said actual pressure, said monitoring device adapted to reduce the pressure applied to said controlling element if the pressure in said controlling element is too high relative to said predetermined pressure ratio.