一、清选设备清选设备主要用于种子的初步处理,可去除裹杂在种粒中间的长梗、大土石块、特大粒、小短屑、轻颖壳、小土石块、特小粒、部分秕谷粒等。就目前来看,此类机械主要有两种原理,三种组合。两种原理是:一是根据轻杂与良种之间较大的比重差异性,所表现出来的在风中悬浮速度不同,利用一定的风速,将轻杂和良种分离,即风选;二是根据大小杂与良种之间较大的外在形状和几何尺寸的差异性所表现出来的在筛孔中通过性的不同,利用具有一定形状和几何尺寸筛孔的筛片将大小杂和良种筛分,即筛选。三种组合形式为:单 First, the cleaning equipment The cleaning equipment is mainly used for the initial treatment of seeds can be removed wrapped in the middle of the long stems, large earth blocks, extra large grains, small short crumbs, glume shells, small rocks, special Small grains, some grains and so on. For the moment, these machines mainly have two principles, three combinations. Two kinds of principle are: First, according to the difference of light weight and the larger proportion among the elite, which shows the different speed in the wind suspension, the use of a certain wind speed, light hybrids and seed separation, namely wind election; Second is According to the size of miscellaneous and good varieties between the larger external shape and geometry of the differences shown in the mesh through the different sex, the use of a certain shape and size sieve sieve mesh size and hybrid seed screen Points, that is, screening. The three combinations are: single