带状耕作对种床秸秆清除率和土壤扰动的仿真与试验

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.