EXPERIMENTAL RESEARCH ON THREE-LEVEL VIBRATING SCREENING OF BUCKWHEAT BASED ON DISCRETE ELEMENT METHOD

To improve the operating effect of buckwheat classifying equipment and meanwhile reduce dependence on tests in process parameter optimization equipment, this paper designed a three-level screen for buckwheat, confirmed structure parameters upper lower sieves, established screening discrete element model with EDEM software, conducted numerical simulation sieving processes at an amplitude 24 mm, 28 mm 32 respectively. The results indicated that when inclination angle surface was 3°, vibrational direction 30° frequency 4.5 HZ, as increased, conveying capacity increased same time seed loss rate also which 16 s, 0.03%, 0.37% 1.42%, respectively; proportion medium particles collecting box overflow 2.88%, 8.65% 17.65%, small residue 0.58%, 6.06% 19.14%, Through comprehensive analysis capacity, effect, good. This study can provide reference design equipment.