基于稻种胚胎定向排列的排种器及参数优化

Seed metering device based on orienting ordered arrangement in embryo and parameter optimization

提出了超级稻种按胚胎部位定向排列播种的思想.利用稻种沿其长轴两个方向摩擦角不同的特性,设计了带有导向板的振动式排种器,实现稻种在振动板上有序排列,分析了稻种在排种过程中胚胎按序排列的机理.运用正交试验法研究了排种器各参数对排序效果的影响,得到各个参数的影响大小次序和一组优化的结构参数.当导向板与播种方向的夹角为35;°筛面角为21°;振幅为3.5 mm;振动方向角为10°;振动频率为3.5 Hz;导向板摩擦角顺行为57.1,°逆行为52.6°时,播种时稻种的定向排列比例为85%以上,振动板对超级稻种摩擦阻力矩的范围为1.89×10-7N.m<Mf<2.23×10-7N.m.

Planting requirement of super-rice is 1 - 2 seedlings per hill, so seeding uniformity and orienting ordered arrangement in embryo are required for super-rice transplanting mechanization. When rice glumes with sliding trend in the opposite direction, coefficient of static friction is larger than in the same direction. These friction properties were used as the basis of designing seeding machines by guided plate and achieving rice seeds array in the same direction when seeding. Based on the device, orthogonal method was used to analyze the effect on rice arrangement, and a set of parameters were obtained. When β =35°, α =21°, A =3.5 mm, ε = 10°,f=3.5 Hz, φn =57.1° and φs =52.6°,more than 85% of rice seed were reached seed embryo ordering. The scope of friction moment between rice seed and vibration plate was between 1.89 × 10^-7 N · m and 2.23 × 10^-7 N · m.