Authors

Abstract

Strip-tillage is an effective option for proper seedbed preparation because it ensures the suitable conditions for seed germination and has been widely implemented. This study developed a strip-tillage of corn planter row cleaner using bionic vertical rotary blades to remove seedbed straw and ideal soil for no tillage sowing can be created. Through the qualitative analysis of the serrated arrangement contour of the praying mantis foreleg tip, the characteristic curve of the praying mantis foreleg tip was extracted and fitted, and the bionic geometric structure surface of the vertical rotary blade was constructed. The model and interaction system were established in EDEM 2.6 simulation environment, and their physical properties were calibrated with the real properties of lime concretion black soil and wheat straw. According to theoretical design to set simulation parameters, the radius of the cutter head was set to 120 mm, the driving speed of the cutter shaft was set to 500 r/min, and the depth of the cutting edge was set to 10 mm, the operating velocity of the active anti-blocking device was set to 5 km/h. The experiment results show that when the moving speed ratio is increased from 2.8 to 4.5, compared with the traditional vertical rotary blades, the straw removal rate and soil uniformity of seed bed are increased by 6.4% and 9.3%, and the average torque of the rotary tiller has been reduced by 12.3% respectively, the process effect and sowing quality being effectively improved. The study can provide theoretical reference for realization of no-tillage sowing vertical rotary tillage blade to reduce resistance and consumption and improve the quality

Abstract in Chinese

带状耕作是可以为种子发芽提供良好环境的一种途径，已经被广泛应用。本文设计了一种基于螳螂趾多段锯齿状结构的立式仿生清茬防堵装置。通过对螳螂前肢尖锯齿状排列轮廓进行了定性分析，提取并拟合出螳螂前肢尖特征曲线，构建了立式旋耕刀的仿生几何结构曲面。运用 EDEM 软件构建无支撑秸秆全覆盖土壤离散元模型，在秸秆-土壤-仿生立式清茬防堵装置系统中进行秸秆移位虚拟仿真，设了仿生立式清茬防堵装置的刀轴驱动转速为500r/min、回转半径为 150 mm及刀齿入土深度为10mm，利用仿真数据对秸秆扰动位移、清秸率进行分析，检验仿生立式清茬防堵装置结构参数和运动参数设计的合理性，试验结果表明，当移动速度比由2.8提高到4.5时，与传统的立式旋耕刀相比，秸秆清理率和种床土壤均匀度分别提高了6.4%和9.3%，旋耕机的平均扭矩降低了12.3%。本文的研究结果为实现免耕播种立式清茬防堵装置减少阻力和消耗，提高种床耕作质量提供了理论参考。