a machine for removing dust and foreign matter from grain, for removing the husks from the products of the processing of crops, and for checking the quality of the hulled product, by-products, and hulls. Grain separators are divided into two groups.
In separators of the first group, which operate with a variable amount of air, grain is fed into the separator by a feeder roller and is regulated by valves and counterweights. The setting of the valve is determined by screws. In the separator passages, particles that are more prone to blow away are carried off and settle in a chamber, from which they drop out as they accumulate. In separators of the second group, which operate with a constant amount of air, the grain falls in an even layer through a tube of the working chamber and a valve onto a movable deflecting panel and from it into an outlet channel, undergoing two blowing processes en route. The impurities picked up by the airflow pass along the aspiration duct into the settling chamber, from which they are removed by a worm conveyor. The air enters the suction intake of the fan, which feeds it to the opening of the working chamber for repeated blowing.