Forklift Door Frame Dynamic And Static Joint Simulation And Structural Optimization

Driven by the economic globalization and e-commerce,the logistics industry has developed rapidly and has become China’s largest industry.Forklifts,as the most core equipment of the logistics industry,their performance directly affects logistics efficiency and then affects the economic development.The mast is a key component of the forklift for lifting goods.In recent years,new forklifts have developed in the direction of large lifts and high lifts,which have placed higher requirements on the performance of the mast.Traditional physical prototype-based design methods have high The shortcomings of long cycle and large design margin are no longer enough to meet the needs of high performance masts.The research object of this paper is the two-stage mast structure of a certain type of internal combustion forklift.The research is based on dynamic and static CAE simulation technology and structural optimization technology.Firstly,a multi-body dynamic model of the forklift is established through virtual prototype technology,and dynamic simulation analysis is performed for a variety of different working conditions.The displacement and load of key parts of the mast are output as the boundary conditions for static analysis.Preprocess the model in Hypermesh,including mesh division,mesh connection,application of loads and constraints,etc.Ansys is used to solve the finite element model of the gantry,and its mechanical properties such as strength,stiffness,and load capacity are analyzed..Then,the lightweight design was carried out based on the static analysis results of the portal frame,and a lightweight design method based on the combined approximate model was proposed.Through the entropy weight TOPSIS structure comprehensive contribution analysis method,the design parameters that have the greatest i MPact on the performance of the portal frame are selected as lightweight design variables.The sample points collected by the hypercube experimental design method were used to construct a combined approximate model of the outer gantry mass,maximum stress,and maximum deformation,and combined with the NLPQLP secondary sequence planning algorithm to develop a lightweight design,the outer gantry was optimized to reduce the mass by 13.36%,The maximum stress is reduced by 4.65%.Due to the irrational shape of the busbar of the mast roller,the contact stress between the roller and the channel steel is too large,and serious stress concentration occurs at the contact edge,which is also one of the main causes of fatigue damage to the mast.Aiming at this problem,the paper finally conducted nonlinear contact analysis between the roller and the channel steel by using the non-linear finite element software ABAUQS and the finite element pre-processing software Hypermesh to study the influence of different wheel pressure and different material properties on the contact stress.The modification plan makes the contact stress greatly reduced,the "edge effect" is reduced,and the fatigue life of the mast is effectively improved.