双转子水平旋转搂草机弹齿疲劳寿命分析

Fatigue Life Analysis of Spring Teeth of Double Rotor Horizontal Rotating Rake

针对目前内蒙地区华德牧草生产的9LSQ-5.3型水平旋转搂草机弹齿部分结构性能较差、易发生疲劳损伤造成断裂,且作业环境受地形影响载荷复杂的问题,对载荷特性和弹齿疲劳寿命展开分析。首先,通过有限元分析获得弹齿的固有频率和振型,找出弹齿疲劳损伤危险点,以草场试验获得加速度数据并根据加速度数据绘制路面载荷谱;结合相关疲劳分析理论,在ANSYS中利用断裂力学仿真法结合路面载荷谱、材料特性参数对应关系进行疲劳分析,得到危险点寿命为4955 h,并通过材料优化提高弹齿寿命。

In view of the poor structure and performance of spring teeth of 9LSQ-5.3 type horizontal rotating rake rake produced by Huade grass in Inner Mongolia,which is prone to fatigue damage and fracture,and the complex loading environment affected by terrain,the loading characteristics and fatigue life of spring teeth were analyzed.Firstly,the natural frequency and mode of vibration of the elastic tooth are obtained through finite element analysis,and the dangerous point of fatigue damage of the elastic tooth is found out.Then,the grassland experiment obtains the data and draws the pavement spectrum according to the data.Combined with the relevant fatigue analysis theory,the fracture mechanics simulation method was used in ANSYS to conduct fatigue analysis in combination with the pavement load spectrum,material characteristics and corresponding relationship,and the life of the hazard point was obtained as 4995h,and the elastic tooth life was improved through structural optimization.