Automatic particle size analyzer using stacked sieves

G - Physics – 01 – N

Patent

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G01N 15/02 (2006.01) B07B 1/38 (2006.01) B07B 1/42 (2006.01) B07B 1/46 (2006.01) B07B 13/04 (2006.01) B07B 13/08 (2006.01) B07B 13/16 (2006.01)

Patent

CA 2126448

The size range of particles separated on a stack of sieves (16a-16f) of different mesh sizes is measured automatically. The stack is clamped together and shaken as a unit to separate the respective fractions, following which the sieves are sequentially separated from the stack and inverted one at a time to dump the fraction retained on each, onto a scale (102). Each fraction is weighed separately and their relative proportions can be calculated automatically. In a preferred embodiment the sieves are individually cantilevered from a vertical conveyor (28). The sieves are inverted one by one to dump their contents by advancing them around a horizontal roll (32) at a lower end of the conveyor.

L'étendue granulométrique de particules séparées au moyen d'une pile de tamis (16a-16f) présentant différentes ouvertures de maille est automatiquement mesurée. La pile est assemblée par serrage et secouée en bloc pour séparer les fractions respectives, après quoi les tamis sont séparés de manière séquentielle de la pile, et renversés un à un pour déverser sur une balance (102), la fraction retenue sur chacun d'eux. Chaque fraction est pesée séparément, les proportions relatives des fractions étant automatiquement calculées. Selon un mode préféré de réalisation, les tamis sont individuellement monté en porte à faux sur un transporteur vertical (28). Les tamis sont renversées un à un pour déverser leur contenu en tournant autour d'un cylindre horizontal (32) placé à l'extrémité inférieure du transporteur.

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