The proportion of machines all stainless steel sieve bed, safe and reliable durability proportion of machine use high proportion of machine without space constraints, the general processing plants can be used. Proportion of machines according to the size of the cereal grains, dry humidity, adjust the speed screening. This model most of the weight machine with the use of the whole plant equipment, such as grinder, stoner, size-sorting machines, and so on. Also stand-alone use. Principle - purpose - characteristics: the of Ng Fung specific gravity machine is the key equipment of seeds and agricultural processing, can be used for a variety of dry granular materials sorting, airflow and vibration friction material generated a larger proportion materials sinking to the bottom, close to the sieve for height mobile, a smaller proportion of the material is suspended in the surface of the material layer to the lower flow, and to achieve the purpose of separation by gravity. This weight machine home and abroad, the advantage of a variety of specific gravity machine and the user needs the proportion of R & D and production machines, the proportion of machines are widely used in seed processing and agricultural by-products processing industry, all kinds of cereal seeds have a good selection of effect. The proportion of functional eliminate blighted Valley, Sprout, infestation, spoilage or deterioration the smut and with Glume of the grain, the geometric size of less than 2mm of grass seed, sand, stones, clods can clear. Featured seed grain weight, germination rate, clarity, and uniformity are significantly improved, especially after the basic cleaning corn, rice, wheat, sorghum, cotton, beans, rapeseed, vegetables, Chinese pine, the larch, arborvitae, spruce, locust seed, using the proportion of machine selection, the effect is more. The reasonable proportion of machine design, excellent performance, high efficiency, easy to operate, reliable work, good versatility, sports balanced, long service life, not easy to damage the damping characteristics of first domestic advanced water.