Authors

Abstract

In order to improve the seed filling performance of mechanical hole type seed metering device with high speed, a vertical disc metering device was designed with seed agitator to improve the seed filling probability. Discrete element simulation method and physical prototype bench tests were used to simulate and analyse the seed metering process. The structure parameters of the seed agitators were optimized by the quadratic orthogonal rotation central composite design test. The results showed that: 1) the addition of seed agitator had a significant influence on the MIS (miss index), among which the concave type had the lowest MIS, and it was the highest without agitator; 2) for concave type agitator, the optimal value of depth and angle were 3.1 mm and 60.5°, respectively; 3) the physical prototype tests showed that the QFI (quality of feed index) was more than 95% under the speed of 2-10 km/h, and the MIS was less than 1%, which meets the requirements of precision sowing.

Abstract in Chinese

为了提高机械式排种器的高速作业性能，设计了一种垂直圆盘排种器，通过搅种装置提高种子填充率。采用离散元仿真和台架试验对排种过程进行仿真和分析。采用二次正交旋转中心组合设计试验对搅种装置的结构参数进行优化分析。结果表明：1）搅种装置对漏播指数有显著影响，其中凹式搅种槽的漏播率最低，没有搅种槽时漏播率最高；2）凹式搅种槽的最佳深度和倾角分别为3.1mm和60.5°；3）台架试验表明，在2～10km/h转速下，排种器的合格率大于95%，漏播率小于1%，满足精量播种的要求。