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清茬单体作为斜抛式大豆免耕精播机的关键作业部件,其使用寿命对机具的无故障工作时间起决定性作用。本文首先在介绍免耕精播机作业功能及清茬单体结构组成的基础上,应用EDEM对清茬单体刀齿的土壤切削过程进行模拟仿真,获得单组刀齿单程土壤切削载荷数据及全刀齿土壤切削的载荷-时间历程数据;依此,利用Solid Works Simulation对清茬单体刀盘轴进行有限元静力学分析,模型最大应力发生在键槽端部,值为119.5 MPa,小于材料45号钢许用应力353.2 MPa,满足强度设计要求;清茬单体恒幅及变幅疲劳分析结果表明:模型损坏百分比7.15%,生命周期864 h,刀盘轴是安全的,在作业时段内清茬单体刀盘轴损伤是由中低平均应力循环及较小应力幅值所引起的。研究为清茬单体的疲劳分析提供了一种新的方法。
Clear stubble monomer as a throw-tossed no-tilled precision sowing machine key operating components, the service life of the machine plays a decisive role in the working hours. In this paper, based on the introduction of nil-sow opener function and composition of stubble, the soil cutting process of stub tooth of stubble was simulated by EDEM. All the data of the cutter-soil cutting load-time histories were used. Based on this, Solid Works Simulation was used to analyze the stub shaft of the stubble by finite element method. The maximum stress of the model was 119.5 MPa, 45 steel allowable stress of 353.2 MPa, to meet the strength design requirements; stubble constant amplitude and amplitude fatigue analysis results show that: the model damage percentage of 7.15%, the life cycle of 864 h, cutter shaft is safe, during the operation period The damage of the stubble on the stubble shaft of stubble is caused by the low and middle average stress circulation and the smaller stress amplitude. The research provides a new method for the fatigue analysis of stubble monomer.