B - Operations – Transporting – 07 – B
Patent
B - Operations, Transporting
07
B
209/98
B07B 9/00 (2006.01) B07B 4/08 (2006.01)
Patent
CA 1259953
ABSTRACT A cyclic screening apparatus (10) and method utilizes multiple air flows and differential air pressures to separate undersize and oversize particles from a mixture of 5 to 50 micron size particles. The apparatus (10) comprises support means (12) including a first air flow conduit (14) connected to a blower (16). A lower undersize particle collecting housing (20) and chamber has a secondary air flow inlet (24) and outlet (26) for the first and second air flows and undersize particles, connected to a suction fan (SF). A screen spans and is sealingly clamped between an outer flange (22) of the lower housing and the outer flange (52) of an axially movable and pivotable upper receiving housing and chamber. An air distributor rotor (R) with radial arms (34) is slowly rotated below and directs the first air flow through the screen and into the upper chamber and a part thereof flows through a lower portion (40) and against the bottom of lower housing. A nozzle (80) rotatable at the entrance to the upper housing distributes, with the help of incoming secondary air flow, to disperse particulate material, supplied thereto by feed means, (FM) onto the screen below. Oversize particles are periodically vacummed away by a suction fan (SF') drawing a third flow of air into, through and out a slotted collector arm rotated above the screen. In operation the volume of the first air flow, supplied to the air conduit at a predetermined pressure (P3), is less than the combined volume of the first and second flow drawn out of the lower collecting chamber. Thus, the pressure (P1) in the upper chamber is less than the outside atmospheric pressure but greater than the pressure (P2) in the lower chamber. As a result a portion of secondary outside air flow is drawn into the rotary nozzle and helps to disperse the particulate material and the combined first and second air flows are drawn downwardly and helps gravity carry the undersize particles through the screen and into the lower collecting chamber where another portion of the secondary air is drawn into and combined with the combined downcoming first and second air flows to help carry the undersize particles thereform.
512679
Havig Egil
Lovsland Arnstien
Stole Kjell A.
Gowling Lafleur Henderson Llp
Norton Company
LandOfFree
Screening device and process does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Screening device and process, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Screening device and process will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1305251