Authors

Abstract

In order to study the effect of population disturbance on the filling performance of the seed metering device, this paper uses the pneumatic precision seed metering device as the model, and uses EDEM software to simulate the population movement of three different seed metering devices. The bench test was carried out at different pressures at 12 km/h and at different speeds at 3.5 kPa. The results show that the designed seed disk with grooves has the most intense disturbance and the highest qualified rate. In order to verify the performance of the disk, full factor tests are carried out on the air pressure and speed, The test results show that when the operating speed is 10~12 km/h and the positive pressure is 3~3.5 kPa, the leakage rate is no higher than 5.42%, the replay rate is no higher than 0.42%, and the qualified rate is no lower than 94.58%. When the operating speed is 14 ~ 16 km/h and the positive pressure is 3.5~4 kPa, the leakage rate is not higher than 6.7%, the replay rate is not higher than 1.04%, and the pass rate is not lower than 93.12%. All the indicators are better than the national standard.

Abstract in Chinese

为研究种群扰动对排种器充种性能的影响，本文以气压式精量排种器为模型，运用EDEM软件对3种不同的排种盘进行种群运动仿真，以种层上方颗粒数目和种群平均运动速度作为指标，分析了各排种盘在不同转速下的种群平均运动速度和种层上方区域数量，仿真结果表明转速越快，种群运动越明显。通过台架试验12km/h速度下不同气压和3.5kPa气压下不同速度进行试验，结果表明设计的带凹槽的排种盘扰动最激烈，合格率最高。为了验证该盘的性能对气压和转速进行全因素试验，试验结果表明针对当作业速度10～12km/h，给定正压3～3.5kpa时，漏播率不高于5.42%，重播率不高于0.42%，合格率不低于94.58%；当作业速度在14～16km/h，给定正压3.5～4kpa时，漏播率不高于6.7%，重播率不高于1.04%，合格率不低于93.12%，各项指标均优于国家标准。