METHOD OF AUTOMATIC CONTROL OF FINENESS OF CRUSHED ORE IN FLOW Russian patent published in 2014 - IPC G01N15/02 

FIELD: mining.

SUBSTANCE: method for automatic control of particle size of the crushed ore in the flow comprises determining particle size distribution in the material flow on the basis of the sensor readings, the output signal of which is given to the spectrum analyser and then converted into the signal proportional to the content of the individual fractions of the material fineness. The sensor is used as a level gauge 3. The surface layer of the material flow 6 is scanned with a level gauge beam 3, the line is determined, which envelopes the surface layer of the material, the moving average value of the level gauge signal is calculated, the absolute values of the areas of the figures are calculated, formed by the intersection of the line enveloping the surface layer of the material with the line of the moving average value of the level gauge signal. The statistical distribution of the relative frequencies of observation of equal in value calculated absolute values of the areas of the figures at the range of measurement is calculated, and according to obtained in advance calibration dependence of fineness of individual fractions on the value of absolute values of the areas of the figures formed by intersection of the line enveloping the surface layer of the material with the line of the moving average value of the level gauge signal, distribution of the fractions of fineness of crushed ore in the flow is calculated, also the velocity of the material flow is measured and the absolute values of the areas of the figures formed by the intersection of the line enveloping the surface layer of the material with the line of the moving average value of the level gauge signal, is multiplied by the factor equal to the ratio of the measured rate to the rate corresponding to calibration conditions.

EFFECT: improving reliability and accuracy of control of fineness of crushed ore in the flow by eliminating the influence on the results of measurements of the oscillation of the value and the rate of the material flow.

2 cl, 5 dwg