Centrifugal granulometer
OwnerMichele Tropeainventor
Life of this patent
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Abstract
A centrifugal granulometer comprises a hollow circular horizontal plate that is driven in rotation about its vertical axis and that has a transparent peripheral zone. Particulate material is introduced into the interior of the plate at a predetermined distance radially inward of the periphery of the plate, where it becomes suspended in a liquid. Upon rotation of the plate, the particles migrate through the liquid radially outwardly in dependence on their mass and size. A light beam passing through the translucent peripheral portion is transmitted to a photoelectric receiver with an intensity that varies inversely as the concentration of particles in the peripheral zone. The plot of transmitted light versus time gives information as to the quantity and distribution of the particles according to size and weight.
Claims7
A centrifugal granulometer comprising a centrifugal rotor in the form of a hollow disc, means mounting said disc for rotation about a vertical axis, means for rotating said disc about said vertical axis, a cone mounted for rotation coaxially with said disc, the base of the cone comprising the radially inner edge of a single flat continuous annular chamber within said disc, the disc having a single translucent continuous annular peripheral zone, means to project a light beam through said translucent zone, and photoelectric means to determine and record the intensity of said beam which has passed through said zone as a function of time, said cone comprising the inner wall of a frusto-conical feed passage for a specimen whose granulometry is to be determined, the lower edge of said feed passage opening into the inner edge of said annular chamber entirely about said inner edge.
A centrifugal granulometer comprising a centrifugal rotor in the form of a hollow disc, means mounting said disc for rotation about a vertical axis, means for rotating said disc about said vertical axis, a cone mounted for rotation coaxially with said disc, the base of the cone comprising the radially inner edge of a flat annular chamber within said disc, the disc having a translucent peripheral zone, means to project a light beam through said translucent zone, photoelectric means to determine and record the intensity of said beam which has passed through said zone as a function of time, and at least one valve at the periphery of the disc for the discharge of a specimen that has undergone analysis.
Dependencies are inferred from the claim text.