Authors

Abstract

Aiming at the problem of poor uniformity and stability of fertilizer discharge caused by the operation of the fertilizer discharger in the variable fertilization operation of rice. Combined with the agronomic requirements of deep fertilization on the northeast side, an impeller type variable side deep fertilizer was designed. According to the change of the prescription map, change the adjustment factors to achieve reasonable fertilization. Based on EDEM simulation, using the fertilizer discharge stability and uniformity coefficient of variation as indicators, under different impeller blades, different impeller speeds and different fertilizer discharge port angles, a secondary orthogonal rotation combination test was carried out, using Design-Expert. V8.0.6.1 is analyzed and tested, the regression equation and the response surface diagram are obtained, the interaction between the influencing factors is analyzed, and the best combination is determined. It is concluded that the stability and uniformity coefficient of variation of fertilizer discharge have reached the quality evaluation index of fertilization machinery According to technical specifications, the coefficient of variation of stability is 0.67%~2.85%, and the coefficient of variation of uniformity is 2.7%~16.4%. When the number of blades is 6, the fan angle of the fertilizer outlet is 35.7°, and the impeller speed is 18.85 r·min-1, the minimum variation coefficient of stability is 0.67%, and the minimum variation coefficient of uniformity is 2.1%. The bench test results are basically consistent with the optimal combination of simulation, and meet the design requirements.

Abstract in Chinese

针对在水稻变量施肥作业中，排肥器运转导致排肥均匀性和稳定性较差的问题。结合东北侧深施肥农艺要求，设计了一种叶轮式变量侧深施肥器。根据处方图变化，改变调节因素来实现合理施肥。基于EDEM模拟仿真，以排肥稳定性、均匀性变异系数为指标，在不同叶轮叶片、不同叶轮转速和不同排肥口角度大小参数下，进行二次正交旋转组合试验，运用Design-Expert.V8.0.6.1进行分析检验，得到回归方程和响应曲面图，分析影响因素之间交互作用，确定最佳组合，得出：排肥稳定性和均匀性变异系数均达到了施肥机械质量评价指标技术规范要求，稳定性变异系数为0.67%~2.85%，均匀性变异系数为2.7%~16.4%。当叶片数为6片，排肥口扇面角度大小为35.7°，叶轮转速为18.85 r·min-1时，稳定性变异系数最小为0.67%，均匀性变异系数最小为2.1%。台架实验结果与仿真最优组合基本吻合，符合设计要求。