What is used to clean grains?

　　What is used to clean grains?

　　Traditional methods

　　The simplest cleaning method, known as winnowing, consists of tossing the grain into the air and letting the wind carry off the lightest impurities.However, this cleaning method does not eliminate the heavier impurities (gravel, foreign grains, earth, etc.).

　　Cleaning devices

　　If the desired product is to be completely free of impurities and suitable for long-term storage, appropriate cleaning devices must be used, such as: winnowers, pre-cleaners and cleaner-separators.

　　A seed cleaner uses a combination of winnowing with a fan to remove lighter particles (e.g. empty grains) and sifting with sieves on an oscillating screen to remove particles that are smaller (e.g. weed seeds) and larger particles (e.g. straw).

　　Winnowers

　　These machines, some models of which may reach an output of one ton per hour, can significantly contribute to improving product quality and marketing, especially in production areas.

　　Sometimes operated by hand but more often motorized, winnowers are relatively simple machines that consist mainly of a hopper to receive the grain, a fan and a set of sieves.The grain unloaded into the hoppers first has its lightest impurities removed by running it through a current of air produced by a fan.Then, the set of sieves completes the cleaning of the grain at the same time it is sorted according to size.

　　Pre-cleaners

　　These motor-driven devices are generally used to pre-clean grain that has been harvested when moist, before it goes to the artificial dryer.

　　There are several models of pre-cleaner:

　　The circular pre-cleaner, in which impurities are eliminated principally by suction

　　The drum pre-cleaner, in which the heaviest impurities are eliminated by passing the grain through the meshes of a drum, and the lightest are eliminated by suction

　　The clodder, in which the bulkiest impurities are eliminated by means of a coarse, vibrating sieve.

　　Combined cleaner and separator

　　These machines, whose large outputs can be as much as 20 tonnes an hour, are certainly the most effective instruments for cleaning grain, and all storage centres should be equipped with them.

　　Combined cleaner and separators are motor-driven and consist mainly of a reception hopper, a fan and set of viurities, followed by siftings of the grain.

　　Gravity Destoner

　　Gravity grading destoner is used to remove impurities in raw material, this destoner can efficiently separate the stones, glasses and other high density or low density impurities in grain. There are two layers of the destoner with different functions.Applied for continuous stone removing process, our gravity destoner comes with high separating efficiency, high throughput, and wide application.