Grinding apparatus for a suspension of fibres for paper manufact

Details Grinding apparatus for a suspension of fibres for paper manufact Grinding apparatus for a suspension of fibres for paper manufact

1981-08-20

1983-09-06

Rosenbaum, Mark

Solid material comminution or disintegration

Apparatus

With automatic control

2412592, B02C 714

Patent

active

044024630

ABSTRACT:
A housing is equipped with a set of grinding tools and a rotor equipped with a second set of grinding tools. One of the parts carrying the grinding tool set is moveable in relation to the other part, which may be constituted by the rotor, in axial direction of the rotor and can be adjusted by a piston-and-cylinder unit impingeable with a pressurized fluid medium, preferably compressed air. The compressed air infeed into the piston-and-cylinder unit is accomplished by a compensation force regulator controlled as a function of the pressure of the stock suspension within the internal compartment of the housing and a grinding force regulator controlled independently of the compensation force regulator in accordance with a set value signal infed by a control line. The pressure force exerted upon the one moveable part therefore is the resultant of a first force component influenced by the compensation force regulator and corresponding to a compensation force which compensates the pressure force of the stock suspension and a second force component influenced by the grinding force regulator and adjustable in accordance with a predetermined grinding force. Thus, there prevails a substantially constant grinding load which is practically independent of possible changes of the stock suspension pressure within the housing.

REFERENCES:
patent: 3276701 (1966-10-01), Fisher
patent: 3420458 (1969-01-01), Yli-Paavola
patent: 3604645 (1971-09-01), Keyes
patent: 3810584 (1974-05-01), Kahmann
patent: 3847359 (1974-11-01), Holmes et al.

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