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The separating ability of the lattice surface when working with combed grain heaps of various fractional compositions was studied. The scientific hypothesis of the study is the assumption that with an increase in the mass fraction of chaff in the heap, the separation efficiency should decrease due to an increase in the volume of grain with a constant mass of the sample of the heap under study as the grain content decreases due to the larger volumetric mass of the latter compared to the chaff. It is a legitimate assumption that the passage of a larger volume of heap through the holes of the lattice surface requires more time, that is, the separation rate should decrease. Experimental studies were carried out on a combed grain heap of wheat variety Moskovskaya 56 with a relative humidity of 12%. The mass fraction of grain in the heap varied from 100 to 60% in increments of 10%. The experimental installation was made on the basis of the grain elevator of the KZS 1218 combine harvester, in which, instead of the dismantled lower wall, a lattice surface with longitudinal holes 900 mm long and 12 mm wide was installed. The installation simulated the operation of the inclined chamber of a combine harvester, the lattice bottom of which should separate free grain from the combed heap and direct it for cleaning, bypassing the threshing apparatus. In this regard, the speed of the scraper conveyor was 3 m/s. The heap that passed through the holes in the lattice was caught, after which it was disassembled into fractions and accounted for. As a result of the experiment, it was established that as the mass fraction of grain in the heap decreases, the separation rate of the latter within the zone of variation of the initial parameter decreases by 4%. Therefore, it is advisable to first remove a significant portion of light impurities from the combed heap before it enters the inclined chamber.
Ozherelev et al. (Sat,) studied this question.