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Wheat threshing machineis mainly used for threshing wheat as well as millet, soybean and canola to provide primary separation of seed, straw and chaff without shaft twining by wet wheat and choking by dry wheat. It is mainly of four-separation type and matched with a diesel engine or tractor as the power.

It has a cylinder with concave inside it. The cylinder has sharp serrated bars, and rotates at high speed, so that the bars beat against the grain. The concave is curved to match the curve of the cylinder and serves to hold the grain as it is beaten. The beating releases the grain from the straw and chaff.

When the majority of the grain falls through the concave into the sieves, the straw is carried by a set of straw shaker to the rear of the machine, allowing any grain and chaff still in the straw to fall below. Below the straw walkers, a fan blows a stream of air across the grain, removing dust and fines and blowing them away.

The grain, either coming through the concave or the straw shaker, will fall down to the sieves which shake mechanically. The top sieves have larger openings and serves to remove large pieces of chaff from the grain. The lower sieves separate clean grain, which falls through, from incompletely threshed pieces. The incompletely threshed grain is returned to the cylinder by means of a system of conveyors, where the process repeats.

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