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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.

Influence of rotary grain crusher parameters on quality of finished product