作为一种适用于设施园艺大棚的微型农业机械,微耕机已得到广泛使用.微耕机的车架底盘直接影响着整机的性能和使用寿命,但目前大多数停留在静力学分析的层面上,对其进行动力学分析研究的仍然较少.本文基于ansys workbench软件的模态分析模块,分析了各阶频率、对应的振型及应变云图,为避免发生共振及后续改进等研究提供有效的理论基础.

The microstructure and micro crack morphologies of the weld between the impeller body and the spoiler were observed by using optical microscope and scanning electron microscope. The results show that the stress corrosion cracking initiates and propagates in the welding heat affected zone near the fusion line, and the microstructure of impeller body near the fusion line obviously changes compared with the parent metal. The welding thermal cycle directly causes the heat affected zone near near the fusion line to produce Cr2N and to form a poor Cr area around. The formation of the poor Cr area is the root of corrosion resistance degradation of the weld microstructure and the main cause of premature stress corrosion cracking of the impeller. In the case that the impeller cannot undertake post heat treatment, the on-site verification shows that removing the spoilers near the heart area of the impeller does not obviously reduce the turbulence effect, meanwhile it can avoid stress corrosion cracking.

针对CK7520B型车床装夹工件的要求,设计了一款新型机械手的夹持机构,利用UG软件对其进行了计算机辅助设计,利用Parasolid格式实现了UG和ADAMS的数据交换,利用MSC.ADAMS对夹持机构进行了虚拟仿真,给出了在工况下夹持机构的各动力学参数,利用上述参数进行了验证分析,对夹持机构中零件进行了校核.最终设计的夹持机构满足了空间和抓举的要求.

物联网是由多项信息技术融合而成的新型技术体系,物联网在农业上的应用是现代农业发展的方向.本文阐述了物联网在现代农业上应用的意义和应用现状,分析物联网在农业上应用存在的问题和制约因素,指出了物联网在农业上应用的发展对策,最后对物联网在现代农业上应用进行了展望.