关键词: 秸秆还田机, 离散元, 弯刀—秸秆—土壤, 互作模型

Abstract:

The mechanical state of the straw returning machine directly affects the returning quality and tool reliability. The optimization experiment of tillage parameters was carried out in the black soil with a water content of 30% and firmness of 700 kPa. It was concluded that the average value of cutter shaft torque was the smallest when the tillage depth was 20 cm, the rotation speed of the cutter shaft was 240 r/min, and the unit straw amount was 3.5 kg/m². Based on the tillage of parameters optimized and determination of the simulation of contact parameters and material parameters, the simulation interaction models of returning machete soil and returning machete soil straw were established by the discrete element method. The changes of torque of machete with and without straw were compared, analyzed, and verified by experiments. The simulation test showed that the maximum torque with and without straw was 25.8 N∙m and 21.7 N∙m, respectively, and the average torque was 19.5 N∙m and 17.4 N∙m. The average power consumption of knife roller with straw was greater than 12.1% of that without straw. The verification test showed that the maximum torque with and without straw was 32.3 N∙m and 26.7 N∙m, respectively, and the average torque was 23.7 N∙m and 21.3 N∙m. The average torque with straw was about 11.3% higher than that without straw. The comparative analysis showed that the changing trend of the test value and simulation value with or without straw was basically the same, but the test value was higher than the simulation value, and the data fluctuated and changed quickly.

Key words: straw returning machine, discrete element method, scimitarstrawsoil;