G - Physics – 01 – N
Patent
G - Physics
01
N
73/102
G01N 15/02 (2006.01)
Patent
CA 1327460
Abstract The invention relates to a method and means for automatic analysis for determining the size distribution of particles and deviation from desired shape and colour. The method includes collection of particle samples and generation of a particle curtain in monolayer form. It is formed by taking particles through a silo whose distance (a) to a vibrating plate positioned below has a length relative to the distance (b) between the outer edge of the plate and the centre line of the silo that is large enough for the particles flowing out of the silo and down onto the plate and out over its edge to form an angle .alpha. with the horizontal plane. The angle .alpha. is 95 - 50 % of the sliding angle of the particulate material. The particle curtain is lit up and the silhouette of the particles therein is recorded and analyzed and pre- sented in at least one place. The means includes sampler (1) plus silo (3) with at least one level sensor (4) to record the level of particles in the silo (3) and to give a signal to sampler (1). The silo (3) has a vertically displaceable extension (6) at its outlet opening. The lower part of the extension (6) is at a distance a from a vibrating plate (8).
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Asbjõrnsen Odd Andreas
Jõrgensen Terje
Strand Oddbjõrn Erik
Fetherstonhaugh & Co.
Norsk Hydro A.s
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