Abstract
It is scientifically proven that the main factors affecting the productive potential of the animals, are the structure of fodder farms, the quality of feed and methods of feeding. It is known that concentrated fodder are an important component in the diet of animals and contribute to a stronger manifestation of their productive potential. For grinding grain into livestock is usually used crusher with different working bodies. The most widely is spread hammer mill grain crusher. This happens due to the simplicity of their construction and relatively high resource of working bodies. Currently, for farmers are of great interest the small-sized feed factories and units, which include crusher grain with a fan. However, along with the obvious advantages of hammer crusher, like with forced feeding of material and with pneumatic, have a number of disadvantages, one of which is the increased wear of their working bodies: hammers, screens, fan blades. The greatest interest from the point of reducing wear represent fan blades, as changing their shape, it is possible to reduce or increase the intensity of wear. In addition, they are more prone to wear, since all of the crushed material passes through them with great speed, while in the grinding chamber, the amount of grain distributed over a larger number of hammers, and the relative velocity of grains in it decreases. The analysis showed that the intensity of wear of working surfaces of the blades of the fan depends on the coefficient of friction of grains on the blade, the angle of the blade to the radius of the rotor disc, and the greatest influence on friction force has a peripheral speed of the blades. To increase the service life of the blades and reduce the intensity of wear and tear it should be choosen the correct form of the smallest possible radius of curvature. The method is proposed on the basis of which it is possible to calculate the amount of wear of fan blades, taking into account its aerodynamic characteristics.
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