This “technical tip” answers how to calculate the downward force a hopper will exert on a feeder conveyor. Downward Force equals the product of the active volume in cubic feet and the bulk density in pounds per cubic foot. The active parabolic volume may be approximated by a prism which equals the hopper opening length x the hopper opening width x the height of the prism. Prism height equals 3 x length or 3 x width, whichever is smaller.
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