【摘要】 以免耕播种机破茬刀为例,分析破茬刀切断茎秆条件及破茬刀作业时滑切原理,来确定破茬刀结构参数,并借助离散元软件对破茬刀进行仿真试验,研究破茬刀结构参数对于其功耗及土壤扰动面积的影响,从而优化破茬刀结构。理论分析得到:破茬刀的直径范围为420～430mm,滑切角范围为40°～58°。2因素5水平正交旋转组合离散元仿真试验得到:影响破茬刀作业功耗的主次因素为破茬刀直经、滑切角;影响破茬刀土壤扰动面积因素的主次顺序为破茬刀直径、滑切角;理论上当破茬刀直径428.51mm、破茬刀滑切角44.66°时,破茬刀功耗为1.754 6kW,扰动面积为197.836mm~2。试验结果表明:优化后的破茬刀与理论值相比,功耗增加2.23%,土壤扰动面积增加1.31%,均与理论值偏差较小,仿真优化结果可靠。优化后的破茬刀作业性能与作业效果优良,可为少免耕耕作部件的优化设计提供一定依据。更多还原

【Abstract】 The paper takes the stubble chopper which is on the no-tillage seeder as an example to analyze the factors and slide cutting principle of the stubble chopper and to make sure the structure parameters of the stubble chopper. Then using EDEM to do the simulation test on the stubble chopper to study how the structure parameters influence the power consumption and soil disturbance so that the stubble chopper structure can be optimized. Through the theoretical analysis, some parameters of the stubble chopper can be made sure, for example, the range of the diameter is from 420 to 430 mm and the range of the slide cutting angle is from 40°to 58°. Through Two-factor and Five-level Orthogonal Rotating Composite Discrete Element Simulation Test, the primary and secondary factors which influence the power consumption and soil disturbance can be found out. They are the diameter and slide cutting angle of the stubble chopper. Based on the theory, when the diameter is 428.51 mm, the slide cutting angle is 44.66°, the power consumption should be 1.7546 kw and the disturbance area should be 197.836 mm~2. And the result shows that compared with the theoretical value, the optimized power consumption increases by 2.23% and the soil disturbance area increases by 1.31%. It can be found that there is only slight difference between the theoretical one and the optimized one. So it proves the optimization result is reliable. And the optimized stubble chopper has better operating performance and better operating effect. This paper can offer some basis to the optimum design for no-tillage machine parts.更多还原