Crushing feed grain involves hammer crushers, which are characterized by high specific energy consumption and its uneven fractional composition. It is possible to obtain high-quality shredded grain with less energy when using a centrifugal-impact crusher of the new design with a hole in the loading neck to supply the chopping chamber with additional air at a rate of up to 4.8 m/s. An additional hole provides a 1.8...13-time increase in the airspeed through the unloading neck when the rotor's rotation frequency changes from 3,750 to 2,250 min-1 , thereby enabling the timely evacuation of the shredded material from the crusher. The regression equations have been derived to determine the structural and regime parameters of the shredder, which ensure the maximal performance and minimal unit energy costs. The greatest impact on crusher productivity is exerted by the diameter of the sieve holes and the area of the bunker's unloading window. The greatest effect on the specific energy intensity of the grinding process is exerted by the diameter of the sieve holes. The maximal performance of the crusher, 1,440 kg/h, and the minimal energy capacity, taking into consideration the achieved grinding degree, of 2.1 W•s/(kg•grinding degree unit), are observed when using a sieve with the holes' diameter of 7 mm, the rotor's rotation frequency of 3,500 min-1 , and the maximally open unloading window of the bunker, at F = 1.458 m 2 •10-3. The specific energy consumption for chopping barley is less by 1.22...1.89 times than that of the hammer crushers RVO 35, DB-5, KD-2A. The dust-like fraction is less than 5.74 %, which is half the amount of the hammer crusher DM-6. The rational crusher operation modes have been determined in order to prepare feed grain for feeding farm animals of different species and ages

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Grinding of forage grain is a required operation for preparing it for feeding. Crushers, which are widely used for fodder grain crushing, do not provide making a crushed product with a leveled fractional composition, and the grinding process requires high energy intensity. Therefore, the development of alternative grinders that will ensure high-quality grinding of forage grain with less energy is relevant. The article describes the design of the developed test model of a fodder grain grinder of impact centrifugal effect, presents a method for studying its operation when grinding winter rye grain. Grain grinding was carried out with different productive capacity and speed of rotor rotation, and using sieves with holes of different diameters. Based on the study of granulometric composition of the crushed grain, dependence diagrams were plotted that show main quality indicators of grinding process. When using sieves with holes of different diameters, it is possible to obtain a crushed product that meets the requirements of standards for various kinds of farm animals. When comparing energy consumption of a test model of impact centrifugal grinder with hammer-type crushers, the efficiency of using the proposed design of a grinder is confirmed.

Определение оптимальных режимов работы центробежного измельчителя фуражного зерна РЕЗЮМЕАктуальность. Фуражное зерно -важный элемент рационов сельскохозяйственных животных и птицы. Его измельчение -обязательная операция подготовки к скармливанию, которая осуществляется на большинстве предприятий молотковыми дробилками, одним из основных недостатков которых является высокая удельная энергоемкость, поэтому разработка измельчителя, обеспечивающего измельчение фуражного зерна с меньшей удельной энергоемкостью, актуальна. Цель исследования -определение оптимальных режимов работы разработанного центробежного измельчителя фуражного зерна при использовании решет с отверстиями диаметром 4, 6 и 8 мм. Результаты. Определено, что наибольшее влияние на удельную энергоемкость процесса измельчения зерна оказывают диаметр отверстий решета и частота вращения ротора. Для определения минимальных значений критерия оптимизации функция зависимости удельной энергоемкости измельчения зерна от частоты вращения ротора была исследована на экстремум. Это позволило определить оптимальные режимы работы измельчителя для решет с отверстиями исследуемых диаметров.