Improvements in wind tunnel for cleaning and classifying...

B - Operations – Transporting – 07 – B

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B07B 4/00 (2006.01) B07B 4/02 (2006.01) B07B 4/04 (2006.01) B07B 9/00 (2006.01) B07B 13/11 (2006.01) B65G 53/40 (2006.01)

Patent

CA 2374231

A first stage chamber (10) has upwardly diverging walls (12a and 12b) to let an upward airstream passing through. When particles are fed homogeneously at the top chamber (10), they reach equilibrium at different heights depending on their weights. The particles suspended and classified at different heights are conveyed by a horizontal airstream in parallel horizontal channels (41) toward a chamber side wall (12b) where they are removed. Ribbed sections (44) adjacent to the channels (41) divide the chamber into deviating pathways to homogenize the spread of particles in the chamber. Light trash is removed through the top toward a cyclone (33). Heavy particles are removed at the chamber bottom. A second stage (70) received the particles from the first stage chamber (10) and performs a further classification by ballistically projecting the particles into one of two groups.

L'invention concerne une chambre de première étape (10) comportant des parois (12a et 12b) qui sont divergentes dans le sens ascendant, de manière qu'elles laissent passer un courant d'air ascendant. Lorsqu'on alimente de manière homogène la chambre supérieure (10), elles parviennent à un équilibre à des hauteurs différentes selon leur poids. Les particules suspendues et classées à différentes hauteurs sont transportées par un courant d'air dans des canaux horizontaux parallèles (41) et amenées vers une paroi latérale de la chambre (12b) où elles sont éliminées. Des parties crénelées (44) adjacentes aux canaux (41) divisent la chambre en plusieurs voies afin d'homogénéiser la distribution des particules dans la chambre. Les détritus légers sont éliminés par le sommet et dirigés sur un cyclone (33). Les particules lourdes sont éliminées au fond de la chambre. Un second étage (70) reçoit les particules provenant de la chambre de premier étage (10) et procède à un nouveau classement en projetant ces particules de manière balistique dans un des deux groupes.

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