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To install the switch, cut out a small panel, on the order of 8 by 8 inches, from the side of the bin at the level where you'd want to shut off the belt and limit any further material buildup. Cut this panel out carefully because the cut-out piece will be used as a hinged pressure plate. Attach the panel back in its original position using a hinge and a torsion spring mounted along the bottom of the panel. Position and wire an electrical switch such that when pressure on the side of the enclosure pushes the hinged panel outward, the switch will be activated and shut off the feed belt.
Whatever method you use, ensure that your bins and chutes are equipped to effectively prevent spillage. By stopping the flow of material before spillage occurs you not only eliminate manual clean-up work, but you prevent the type of accidents associated with such work.
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Several methods are available to stop the flow of material to a chute or bin and prevent spillage. These include the use of sonic or optic sensors, tilt switches, and rotating-vane type indicators.