Analysis and optimization of working parameters of vertical rotary tiller blade based on discrete element method

In order to explore the influence of tilling parameters of vertical rotary tilling blade on its stress and soil crushing effect, a discrete element model of vertical tilling blade operation was firstly established, and the resistance and torque of rotary tilling blade were analyzed. By designing orthogonal rotary test, the influence of working parameters of vertical rotary blade on rotary resistance, torque, power and soil breakage rate was obtained and a mathematical model was established. The model could be used to predict data and guide operations. Through response surface analysis and mathematical model analysis, single blade power and soil crushing rate of vertical rotary tillage cutter were optimized, and the optimal operating parameters were obtained as follows: forward speed 1.2 m/s, tool speed 307.141 r/min, tillage depth 25 cm, power of vertical rotary tillage cutter 7.042 kW, soil crushing rate 80.85%. The optimal working parameters were put into the simulation test, and the relative error of the predicted power and the simulated power was 3.97% and the relative error of the soil breakage rate was 3.45%, which verified the availability of the prediction model.