Authors

Abstract

Buckwheat huller is the key equipment of the buckwheat rice processing and its performance is directly related to the quality and yield of buckwheat rice. The key working parts of the sand disc sheller are a pair of parallel sand discs. The structure and the working parameters of the sand discs are the key factors affecting the shelling performance. In this paper, the effect of rotating speed of sand disc, shelling clearance, grain size of sand disc and width of the working face on the shelling performance are experimentally investigated. The results show that the rice yield and relative broken rice rate increase with the increase of the rotating speed of the lower sand disc, and the relative broken rice rate increases sharply when the speed reaches a certain value. With the linear increase of the shelling clearance, the rice yield and the relative broken rice rate are first decreased rapidly, and then decrease slowly. The smaller the particle size of the sand disc is, the higher the rice yield and the relative broken rice rate are, and the influence of the lower sand disc is obviously greater than that of the upper one. Properly widening the width of working face will increase the rice yield but the width tends to have little influence on the rice yield when it increases to a certain extent, and its change has a small impact on the relative broken rice rate. According to the results of single factor test and orthogonal test, the sheller can achieve a better shelling performance and work efficiency when the grain size of the upper sand disc is F24, the grain size of the lower sand disc is F36, the shelling clearance is 5 mm, the rotating speed of the sand disc is 950 r/min, and the width of the working face is 2 cm

Abstract in Chinese

荞麦剥壳机是荞麦米加工的关键设备，其性能的优劣直接关系着荞麦米的质量和产量。砂盘式剥壳机其关键工作部件为一对平行放置的砂盘，砂盘的结构和工作参数是影响剥壳效果的关键因素。文中以砂盘转速、剥壳间隙、砂盘的粒度及工作面宽度为试验因素对剥壳效果进行了试验研究。试验结果表明：随着下砂盘转速的增加，出米率和相对碎米率随之上升，当速度到达一定数值后相对碎米率急剧上升；随着剥壳间隙的线性增大，出米率和相对碎米率先出现快速下降，随后缓慢下降；砂盘粒度越小出米率和相对碎米率越高，且下砂盘的影响程度明显大于上砂盘；工作面宽度的适当增加会造成出米率的增加，当增大到一定程度后对出米率影响趋于平缓，其对相对碎米率影响较小。综合单因素试验和正交试验结果可知，上砂盘粒度24目、下砂盘粒度36目，剥壳间隙5mm、砂盘转速950r/min、工作面宽度2cm时，剥壳机能够取得较好的剥壳效果和工作效率。