Two-stage wood-chip drum-screen with dust removal

Details Two-stage wood-chip drum-screen with dust removal Two-stage wood-chip drum-screen with dust removal

B - Operations, Transporting

07

B

209/114

B07B 4/06 (2006.01) B07B 1/24 (2006.01)

Patent

CA 1039237

ABSTRACT OF THE DISCLOSURE A drum screen for cleaning and classifying wood chips is mounted for rotation. The screen has apertures of varying size to permit cleaned chips to pass through to be deposited on conveyors located below. An internal annular spiral baffle extends the full length of the drum and a series of chip lifters are located between the flights of the spiral baffle and project radially inwards from the interior surface of the drum. Wood chips are fed into the drum at one end and are carried through the drum while being lifted to- wards the axis of the drum by the chip lifters to effect loosening of waste material from the chips. Cleaned chips pass through the apertures in the drum and chips too large to pass through are car- ried forward and discharged from the end of the drum onto a con- veyor. A casing surrounds the upper portion of the drum and par- tially encloses the discharge end of the drum. An air suction de- vice is connected to the discharge end of the drum, drawing off all waste material loosened from the chips.

266748

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