Design of a grain cleaning machine for small farms

A grain cleaning machine is designed and tested for small growing farm entities and farms of Uzbekistan. Unlike the well-known machines, a rolling rubbing device for placing the grain from not threshed heaps is considered in design in order to segregate the grain from unthreshed ears of wheat separated out during grains volume cleaning in the course of cleaning by masticating them with rollers that rotating against each other. The designed grain cleaning machine together with required operation performances has low amount specific metal content and less energy intensity. The weight of machine is 305 kg and consumes power in amount of 2.7 KW at work performance of 350 kg/hour. On the basis of implemented pilot research it is determined that the best mastication of not threshed ears by least damage of grain is achieved at a rotation frequency of the first roller at 600 rpm, and the second roller within 800-1,200 rpm and at backlashes between rollers of 2-3 mm. For achievement of qualitative clearing of grain lots at minimum loss of grain it is necessary to choose the following intervals of parameters and the operation modes: frequency of sieve fluctuations is 100... 150 rpm; amplitude of fluctuations sieve is 30...50 mm; an angle of slope sieve is 8...11.