托盘提升机构动态特性分析及结构优化

Dynamic characteristics analysis and structural optimization of pallet lifting mechanism

称重传感器标定过程中,托盘提升机构动态性能对标定精度有较大影响.文中通过三维软件ProE对托盘提升装置进行三维建模,采用有限元分析技术,对托盘提升机构的模态及谐响应进行理论分析,得到托盘提升装置的固有频率及谐响应曲线,最后对托盘提升机构中响应位移最大的拉杆进行结构优化.研究结果表明,在托盘提升机构的第3,5阶固有模态频率时,气缸与拉杆连接处产生的变形较大;当工作频率接近312.28Hz时,幅频响应曲线的幅值达到峰值,托盘提升装置可能会产生共振;拉杆结构优化设计后,托盘提升机构的最大应力和变形得到大幅度减小.

During the calibration process of the load cell, the dynamic performance of the pallet lifting mechanism has a great influence on the calibration accuracy. In this paper, the three-dimensional modeling of the pallet lifting device is carried out by using 3D software ProE. The finite element analysis technique is used to analyze the modal and harmonic response of the pallet lifting mechanism. The natural frequency response curve of the pallet lifting device is obtained. The pallet lifting mechanism has the structural optimization in response to the largest displacement rod. The results show that the deformation of the cylinder and the rod is larger when the third and fifth order natural modal frequencies of the pallet lifting mechanism are larger. When the operating frequency is close to 312.28Hz, the am plitude of the amplitude-frequency response curve reaches the peak value, and the lifting device may produce resonance.By rod structure optimization design, the maximum stress and deformation of the tray lifting mechanism has been greatly reduced.