夹持式穴播轮种子室内种子运动分析

Analysis on seed movement in seed chamber of clamping dibber wheel

种子在夹持式穴播轮中的运动状态对精密排种有重要影响,应用力学分析计算和试验的方法研究种子在穴播轮直立圆桶型种子室内的运动。在穴播轮转动时种子室内的种子作为一个整体相对种子室中心受顺时针和反时针力矩作用,顺时针力矩使种子沿种子室内圈下滑,反时针力矩使种子随种子室内圈上升。当2个力矩值大小相等时,种子室内种子的深度称为种子下滑临界深度,若种子深度小于临界深度,种子在种子室内圈上整体滑动不上升,否则种子沿种子室内圈上升。试验表明,对现有夹持式穴播轮,未安装取种器时种子下滑临界深度为0.05m,安装取种器时为0.01m。

The seed movement as a whole in the vertical cylinder seed chamber of clamping dibbler wheel has important effects on precision seeding of the dibbler wheel. The purpose of this work was to disclose the law of seed movement in the seed chamber by methods of mechanical analysis and experiment. Seeds as a whole in the seed chamber are forced by two torques relative to the centre point of the seed chamber, which are clockwise and anticlockwise torques, when dibbler wheel rotates. The clockwise torque makes the seed population to slip down on the inner side of the chamber, and the anticlockwise torque makes the seed population to rise and do circular motion around the centre point of seed chamber. When values of the two torques are equal, the depth of seed in the seed chamber is called seed slipping critical depth. Given that seed depth in the seed chamber is lower than seed slipping critical depth, seeds will slip on the inner side of the seed chamber as a whole; otherwise, seeds will go up along the inner side of seed chamber. The experiment showed that the seed critical depth was 0.05 m when seeding devices were not equipped in seed chamber, and the seed critical depth was 0.01 m when seeding devices were equipped.