Authors

Abstract

To address the problems of poor fertilizer distribution uniformity and low application accuracy during the operation of rice fertilizer spreaders, this paper designs a shaftless double-screw fertilizer spreader for rice. Combining dynamic methods to analyze the filling stage and discharge stage of the fertilizer spreader, and investigating the impact of its structural parameters on the uniformity of fertilizer discharge. The fertilizer distribution process was simulated using EDEM software, and single-factor experiments were conducted to analyze the effects of spiral blade outer diameter, pitch, and rotational speed on fertilizer distribution uniformity. Furthermore, a two-factor orthogonal rotational combination experiment was carried out under different structural parameter conditions to analyze the interactions between influencing factors and determine the optimal parameter combination. The optimal parameters were found to be an outer diameter of 23.3 mm, a pitch of 23.6 mm, and a rotational speed of 149.2 r/min, yielding a uniformity coefficient of variation of 6.1%. Bench test results showed that the relative error between the simulation and experimental uniformity coefficient was 0.7%, indicating strong agreement. The results meet the agronomic requirements for fertilization and ensure stable fertilizer supply. These findings provide a reference for the design optimization of spiral fertilizer spreaders.

Abstract in Chinese

针对水稻排肥器作业时存在施肥均匀性差和施肥精度等问题，本文设计了一种无轴双螺旋式水稻排肥器。结合动力学方法对排肥器的充肥阶段与排肥阶段进行分析，探究其结构参数对排肥均匀性的影响。利用EDEM软件对排肥过程进行仿真，通过单因素试验分析螺旋叶片外径、螺距和螺旋转速对排肥均匀性的影响。此外，在不同结构参数条件下进行二次正交旋转组合试验，分析各影响因素之间交互作用并确定最佳参数组合。最优参数组合为当螺旋叶片外径为23.3mm，螺距为23.6mm，转速为149.2r/min，均匀性变异系数为6.1%。台架试验结果表明：均匀性变异系数仿真试验相对误差为0.7%，仿真与台架试验吻合度较好，满足施肥农艺及供肥稳定性要求。研究结果可为螺旋式排肥器设计优化提供参考。