马铃薯收获机摆动筛与块茎运动仿真分析

针对我国现有马铃薯收获机摆动筛设计手段落后、设计效率低等问题,应用基于特征的参数化造型软件Inventor对摆动筛进行参数化造型,采用ADAMS机械仿真软件对收获机摆动筛的虚拟样机进行运动仿真;对摆动筛质心点运动的合成速度、加速度和位移曲线以及块茎质心点所受碰撞压力曲线进行分析。结果表明:当摆动筛摆动频率为5.5 Hz,摆幅为30 mm时,摆动筛质心点的速度v≤500 mm/s,加速度a为2.5 m/s2≤a≤20 m/s2,中、小块茎与筛面的碰撞压力分别为120和250 N,均小于损伤压力,且输送顺畅,伤薯率≤4%,满足设计要求。

Moving simulation analysis on swing sieve of potato harvester

Owing to the unadvanced and inefficient design of a potato harvester,a feature-based parametric modeling software,Autodesk Inventor,was used for its modeling.The movement of swing sieve,a key part of potato harvester,was simulated using the ADAMS package.The complex velocity,acceleration and displacement curves as well as collision pressure curves were analyzed.The analytical results show that the centroid velocity of the swing sieve is lower than 500?mm/s,its acceleration higher than 2.5?m/s~2,the collision pressures of little and middling potatoes are 120?N and 250?N respectively,which are all lower than the damage pressure,potatoes conveying freely and the damaged rate less than 4% when its frequency is 5.5?Hz and the swing amplitude 30?mm.