JUSTIFICATION OF IS CONSTRUCTIVE-TECHNOLOGICAL SCHEME OF FRACTIONAL AIR-SIEVE MACHINES
Issues of the development of technical means as part of the post-harvest grain cleaning technology capable of bringing the quality of the final product to the required purity indicators in a single technological cycle, as well as sorting the grain heap into seed, grain and fodder fractions, were studied. The methods of the theory of solving engineering problems (TRIZ), the laws of the development of technical systems proposed by Altshuller GS, the theoretical basis for assessing the effectiveness of grating and air separation of grains were used. It is established that the effectiveness of screen cleaning depends on the speed of the grate mill, the length of the separating gratings and the specific load. Reserves for improving the quality of lattice cleaning are revealed. It is substantiated that the intensive growth of the efficiency of the screen separator is possible when the function of fractionating the grain heap from the sieve mill is transferred to the aspiration system. It is proposed to intensify the process of isolation of a light impurity by an aspiration system by increasing the velocity of the airflow in the channel, increasing the width of the channel, preliminary formation of the grain flux by the vibrating channel, so that light impurities enter the active layer before the grain material enters the channel.Separate difficult-to-separate large impurities from the bulk of the cleaned grain is suggested using sorting grids with round holes of increased diameter.The expediency of using the single-tier arrangement of the stripping and sorting sieves is established. It is shown that an increase in the lattice mill to three sieves in one module instead of two will increase the length of sorting sieves in 2 times.The structural-technological scheme of the fractional air-screening machine, which improves the process of post-harvest grain separation and allows to isolate forage, seed and food fractions from the initial heap, was developed