The performance of orbiting screw reclaimers operating in flat bottom bins and stockpiles is examined, Such reclaimers are located close to the floor of the bin or stockpile and withdraw bulk solid by conveying it radially inward to the central discharge point, As the screw rotates to effect the feeding process, it also traverses the floor area with an orbiting or slewing motion thus permitting a "first-in, first-out" flow pattern to be achieved, Variable screw geometry is required to achieve both uniform draw-down and controlled load and torque during the slewing motion, Design equations for throughput and torque computations are presented, A primary requirement is for the screw reclaimer to have sufficient lateral and torsional stiffness to limit the deflection and be able to withstand the combined effects of bending and torsion.
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