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In the cost of livestock and poultry products, feed accounts for 55-65%. Compound feed is the energy basis of the diet of animals and poultry: of these, the bird receives 93-95% of the total energy of the feed, pigs - 80-85%, cattle 30-45%. In farms that do not use the services of feed mills, but have a sufficient set of ingredients for the production of their own high-quality mixed feeds, it is advisable to use grinding and mixing blocks (RSB) with a productivity of 2-6 t / h. Such farms include all dairy farms, pig-breeding with a livestock of up to 30 thousand, poultry farms up to 300 thousand laying hens or broilers. The article presents a new constructive design and the principle of operation of technologically linked and autonomously working machines: a plant for fractional grinding and production of mixtures of grain feeds and a plant for the preparation of medical, vitamin and mineral premixes using the laboratory mill ML-1. It is advisable to use a vertical hammer mill with replaceable cylindrical sieves with a height of 200-250 mm, an inner diameter of a cylindrical sieve - 500 mm, a gap between it and the ends of the hammers - 1-2 mm as part of the fractional grinding installation. The number of hammers is determined on the basis that the sum of their thickness should once overlap the height of the perforated part of the sieve. Depending on the daily needs of the farm for feed, it is advisable to use three types of plants: with a capacity of 2 t / h, 4 and 6 t / h. The vibrodoser works from an electric motor with a power of 0.2 ... 0.3 kW with a frequency of 1500 rpm. The prepared premix is ​​poured into one of the bins as an ingredient and dispensed into the feed mixture in a dosage.

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