Structural Design And Optimization Of Automatic Assembly's Lifting Mechanism

This paper takes the design and optimization of non-standard automation equipment as the background.First of all,in terms of the production requirements,a set of lifting mechanism for lifting 100 gal kettle type vessel is designed,then the static analysis and modal analysis are figured out to verify the rationality of the structure design.Finally major load-bearing parts are analyzed,by using finite element simulation analysis and optimization method.This paper summarizes the research status of lifting mechanism at home and abroad.Starting from reliability,stability and lightweight of lifting mechanism both determined the overall scheme are driven by hydraulic power unit not only saves space,but improves the stability and load capacity of the equipment.Guidance with double high-precision linear guides,limited three degrees of freedom of rotation and one degree of freedom of translation,ensure the accuracy and stability of equipment lifting process.The main actuating elements of the lifting mechanism are two hydraulic cylinders mounted in parallel,which can ensure the lifting bracket always paralleled to the ground during lifting while the bracket plane tilt exists in some single hydraulic cylinders having been effectively solved in which leads to stuck guide rail and abnormal noise.Finally,the final design scheme of lifting mechanism is determined comprehensively,and its three-dimensional model is established by using Solidworks three-dimensional modeling software.Finite element model of lifting mechanism is established by ANSYS Workbench and simulation analysis of actual working conditions have been carried out for lifting mechanism.In static strength analysis,the hexahedron entity unit is used to divide the lifting mechanism into meshes,simulate the stress,strain distribution and displacement of the lifting mechanism under actual conditions,and then find out the dangerous position of deformation of the lifting mechanism after being stressed.Then,multi-objective dimension optimization technology is used to optimize the design of relevant parts of the mechanism so as to make the lifting mechanism more effective.The quality of the whole lifting mechanism is reduced by 26.3Kg,and the lightweight effect is remarkable.Finally combined with ANSYSModal module in Workbench,this paper can be based on the databases to carry out modal analysis on the bracket,lifting frame and lifting mechanismas a whole,collect dynamic characteristics parameters such as specific frequencies and corresponding vibration modes of the bracket and lifting frame at the front eight levels,and analyses the influence of each mode on the working characteristics of lifting mechanism;acquires dynamic characteristics parameters at the first three stages of the whole lifting mechanism to improve the performance.The structural design of lifting mechanism provides direction basis.According to the analysis results,it can be seen that resonance will not be affected by comparing the operating frequencies of main running parts of the equipments.Meanwhile,the lifting mechanism has reasonable dynamic performance.Finally,the final configuration and relevant design parameters of the lifting mechanism are determined by combining the initial design and optimization simulation.