Removal of Heavy foreign Material
The rock trap is located on the high side of the deck before the cutout gates. The primary purpose of the rock trap is for removal of a small percentage of heavy contaminant. Initially the rock trap was designed to remove dirt and stones from edible dry beans, hence the name rock trap. However, the rock trap has proven to be effective in many products and is included as standard on all decks. Almost any heavy contaminant may be removed at the rock trap. The greater the density differences between the heavy contaminant and the good product the easier the separation.
Foe best results, the rock trap should be operated to maintain a continuous discharge. If the concentration of heavy foreign material is low then adjust the rock trap gate at the minimum flow rate you can maintain without bridging and stopping the flow. If the percentage of heavy foreign material is high then adjust the rock trap gate for greater flow.