At present, modern hammer crushers are widely used for grinding grain, the technological process of which involves suction of the starting material, crushing and pumping the finished product into an intermediate container to separate feed streams. One of the basic working tools is a separating sieve, by means of which the material to be crushed obtains the required dimensions. The aim of the work was experimental finding of a relationship between the parameters of the separating sieve of the crusher and the quality parameters of the crushed grain. During the operation the sieve parameters are changing due to wear and deformation: the shape and size of the holes change, the thickness of the sieve decreases. Experimental studies have shown a significant impact of the changing parameters of the sieve upon the quality of the crushed grain. The obtained approximating formula shows the linear nature of the increase in the length of the holes of the separating sieve of the crusher depending on the processed grain mass with the value of the approximation reliability R 2 = 0.96. In order to maintain the quality of the finished product, it is necessary to take into account the change in the sieve parameters of the crusher and to replace the sieves in due time. In order to partly meet the requirements for the allowed values of the quality parameters of the grain crushed by the crusher of the discussed design, it is necessary to limit the maximum processed grain mass of the installed sieves to 149000-160000 kg, with the hole size being 10.96 ± 0.04 mm.
One of the undesirable factors when grinding grain with hammer crushers is the formation of flour dust, which is fire and explosive, as well as harmful to the health of service personnel. The applied fabric dust collectors ineffectively purify the air coming out of the pneumatic system of the crusher. One of the directions of development of dust collection equipment is the development of wet dust collectors or the improvement of existing ones. The proposed two-stage wet dust collector gives greater efficiency of air purification from dust, which is shown by laboratory studies. One of the factors affecting the quality of cleaning is the speed of rotation of the agitator blade, which varies depending on the concentration of dust in the liquid of the first stage. Not the entire dust-air mixture passes through the upgraded dust collector, but only the part that is redundant. This allows you to increase the life of the dust collector before the next service. The aim of the work is to study the dependence of the rotation speed of the blade of the agitator of the first stage of the dust collector on the density of the liquid. Methods of mathematical modeling of the agitator operation, approximation and regression analysis were used for the research, correlation analysis was performed. Theoretical studies have revealed a hyperbolic dependence of the rotation frequency of the paddle agitator on the density of the colloidal solution, however, experimental data provided other quantitative indicators. To determine the necessary parameters of the equation, the least squares method was used to approximate the experimental data. The calculated data obtained were compared with the experimental ones by the coefficient of determination, and the model was highly adequate, R2 = 0,9705. The presented method of selecting the regression equation shows good convergence with the experiment. The equations derived for a laboratory installation can be converted to an industrial design using the theory of similarity.
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