Vibrating Grizzly Feeders are engineered to combine the functions of feeders and screens into one machine and are capable of accepting loads, bypassing material and moving material. The tapered opening design of the grizzly bars is self-cleaning. It nudges rocks hanging between bars along to increasingly wider openings, eventually separating them out from oversize material and bypassing the crusher. Bypassing material that is already to size helps producers increase overall plant capacity, boost efficiency, control fines and reduce maintenance.
The main frame of a Vibrating Grizzly Feeder is comprised of deep, fabricated side frames and heavy-duty cross-members and a pan section that incorporates 80,000 lbs. (36,000 kg) of yield-strength steel; all of which are welded and stress-relieved to provide producers with years of low-maintenance service. Replaceable liners protect the pan and are built in segments for economical replacement.
McLanahan also produces Vibrating Grizzly Feeders with a variety of grizzly configurations. Standard grizzly sections are in multiples of 3′ (0.9 m) and available in several different lengths. The most popular design incorporates a 3′ (0.9 m) declined grizzly section at the discharge end to better transition material into the crusher. The two-step grizzly configuration is also a popular variation. In this variation, two grizzly bar sections positioned horizontally with a large step between tumble material for more efficient fines removal. The two-step grizzly can be used in applications where two different sized materials are desired, including rip-rap applications.