... , barley, rice, sorghum, millet. wheat and rice Threshing machine/ Super rice and wheat of combine harvester/Threshing wheat and ... efficiency.Structure and working principle:This machine has into hopper, roller, concave board, and other components of the shelf.Work, will ... roller in the concave board grain sticks of the friction components, extrusion, collision, the jitter make particles on the stem ...