There are schemes of various vibroshakers for classification of dry materials for construction, agriculture, food and processing industry, in mining and transport, examined in this article. As a result, of the analysis the authors came to conclusion about low efficiency and reliability of known vibroshakers. In course of their functioning significant part of consumed energy is spent for bringing in movement of massive driving elements. Actually, each of these vibroshakers realizes only one scheme of loading with relatively narrow range of change of its main parameters (amplitude, frequency, transmitting energy). Besides, intensive dynamic loadings make a negative influence on supporting elements of these machines and that leads to their rapid wear. With examination of these disadvantages of known vibroshakers, authors elaborated schemes of improved vibroshakers with electromagnetic drive for classification of dry materials. The proposed vibroshakers provide complex schemes of loading of processed material and that promotes to increase of efficiency of the working process. In one of these schemes foreseen possibilities of change of location of electromagnetic vibro-exciters relatively of foundation. Later allows to change a scheme of loading of the processed material depending from its physical-mechanical characteristics. An electromagnetic drive of the improved vibroschakers gives possibility of a separate and accurate adjustment of the main parameters of the loading of material in wide range. In the constructions of the vibroschakers are absent elements of friction and massive inertia masses therefore they have an increased reliability and efficiency. There are differential equations of the movements of the executive elements of the vibroschakers are proposed in the article that allow to determine their main working parameters in course of different stages of a working cycle. These equations can be used for creation of methods of design calculation of the proposed vibroschakers.

The processes of grinding dry and wet dispersed materials are common in alcohol, beer, sugar, meat, bakery, feed, chemical and a number of other industries, as well as in construction. Relevant for these processes, especially recently, in connection with the rise in the cost of energy resources, is the problem of reducing energy costs during their implementation, subject to high productivity, sufficient degree and uniformity of grinding and moderate cost of equipment for the process. The article proposes scientifically substantiated dependencies for calculating the minimum required electrical power of an experimental industrial grinder, which is considered as a replacement for hammer crushers, when used to grind wet grain of wheat, rye or corn and ensure the specified performance, taking into account the daily volume of raw materials processed at the enterprise. as well as the permissible degree of its refinement. In particular, equations were obtained to determine the power consumption for bringing the raw material in the grinder into rotary motion, for the friction between the grains of the raw material and the grinder discs, as well as the internal surfaces of its working chamber, for the friction between the grains themselves, the power required for grinding. The electric power of the grinder, the effective efficiency (41%) and the total efficiency (14%), by which it is superior to hammer crushers, have been calculated. In this work, based on the theory of contactless hydraulic seals, the analysis of possible trajectories of the particles of the processed raw materials in the working chamber of the grinder (grains of wheat, rye or corn moistened with water) is carried out, the forces acting on the particles of the raw material in the process of their movement from the axis of the grinder to the periphery of the working chamber are determined, as well as the analysis of the interaction of particles during their grinding, based on the theoretical provisions of the mechanics of quasi-solid and quasi-liquid bodies.