Stress regulator for pulp grinding apparatus and method
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United States of America Patent
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Nov 26, 1991
Issued Date -
N/A
app pub date -
Oct 15, 1990
filing date -
Aug 4, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides a regulator for a refiner or grinding apparatus having opposed relatively rotatable grinding discs. Each grinding disc carries a grinding segment, and a predetermined gap or grinding space is defined between the grinding segments. The regulator, which is provided to compensate for axial variations in the predetermined grinding space due to variations of the load, includes a piston axially movable in a cylinder and a calibrated resilient element acting on the piston. The regulator is coupled to a hydraulic servo motor for the grinding discs, and the dimensions of the piston and cylinder of the regulator are selected to correspond to that of the servo motor, but in reduced scale. By calibrating the resilient element of the regulator to correspond to the axial load applied to the grinding discs, the displacement of the regulator piston corresponds to the relative displacement of the grinding disc and thus to a variation in the grinding space between the grinding discs. Variations in the grinding space are instantaneously and continuously counteracted by the regulator to maintain the grinding space at its predetermined value.
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