关键词: 稻谷颗粒, 烘干, 螺旋搅拌器, 搅拌均匀性, 离散单元法, EDEM软件

Abstract: Aiming at the problems of high cost and long research and development period of equipment stirring effect evaluation under different design and movement parameters of stirred grain drying silo, in order to find the best design and motion parameters of the stirred grain drying silo stirring device, based on the theoretical study of the force and motion of a single grain particle under the action of a spiral agitator, the multi-sphere cluster method was used to establish a multi-sphere particle model of rice particles on the basis of the measured three-dimensional dimensions of rice particles, and the single factor discrete element simulation analysis of screw agitator speed and pitch on mixing uniformity was carried out by using the discrete element simulation software EDEM. The results showed that the higher the rotational speed of the spiral agitator, the better the uniformity, and the better the uniformity could be improved by increasing the pitch in a certain range. Comprehensive analysis shows that when the spiral agitator speed is 30 r/min and the pitch is 110 mm, the minimum stirring variation coefficient is 0.1. The accuracy of the simulation results was verified by the prototype test. The results showed that when the screw agitator speed was 30 r/min and the pitch was 110 mm, the stirring uniformity was higher, and the drying efficiency was increased by 25% compared with the original parameter combination.

Key words: rice particles; , dry, spiral agitator, mixing uniformity, discrete element method, EDEM software