Abstract:Aiming at the phenomenon such as large amount of soil tillage, low rainfall in spring and high resistance to tillage, a striptype operation method with less tillage was proposed, and a driving stubble cutter was designed. By analyzing the working condition of the driven stubble cutter, the tillage resistance of the stubble cutter can be reduced when the sliding angle of the stubble cutter was greater than or equal to the friction angle of the stubble or soil in contact with it. Combined with the measurement of sliding friction angle between stubble and soil and the speed of stubble cutter, the curve equation of blade edge was determined. The stress state of the stubble was further analyzed and the friction angle between materials was measured, and the radius of the driven stubble cutter was 230 mm. Finally, the driven stubble cutter was obtained by determining the geometric size, cutter shaft and cutter head of the blade. Then, the finite element simulation model was used to verify the stability and performance of stubble cutter, and the discrete element simulation experiment was used to compare the performance and effect of stubble cutter operation. The results of the analysis and verification of the finite element simulation modal showed that the driven stubble cutter met the design requirements. The experimental results of discrete element simulation showed that the tillage resistance of the driven stubble cutter was 19.78% lower than that of the driven disc cutter, and the amount of soil throwing was 13.95% lower than that of the driven disc cutter. Therefore, the performance of driven stubble cutter in tillage resistance and soil moving capacity was better.
