At one time, unloader serious failure due to insertion of foreign objects.at one time, the most serious unloader trouble due to foreign object stuckassistall foreign objects were mixed in the coal or stuck in the transport screw then taken out from itall foreign objects which were mixed in the coal or stuck in the transport screw then taken out from itall foreign objects, which were mixed in the coal or stuck in the transport screw then taken out from itmetalscrap