METHOD OF AUTOMATIC CONTROL OF PARTICLE SIZE IN PULP FLOW Russian patent published in 2014 - IPC G01N15/02 

FIELD: measurement equipment.

SUBSTANCE: method for automatic control of particle size in a pulp flow includes periodical feeling of material particles with a micrometer feeler with conversion of particle value fixed by a feeling mechanism, into an electric signal proportionate to their absolute size. For this purpose pulp is sampled, filtered, sent to a conditioning tank. Then sample density is measured in the conditioning tank. At the same time the pulp sample is dissolved by water to the condition providing for getting a single layer of material particles when fixed by the micrometer feeler. Then the dissolved sample is pumped in the circulation mode along the circuit including the conditioning tank and the measurement chamber. After that they measure size of material particles in the circulating flow passing via the measurement chamber during the period of time, duration of which is set by results of preliminary calibration, and the content of controlled class is calculated by results of measurement of contents of intermediate size classes.

EFFECT: increased reliability and accuracy of measurements of grain composition of material in a pulp flow.

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