Design And Optimization Of Scissor Lift System For Aerial Work Platform

With the rapid development of urban infrastructure construction,national defense industry,modern logistics warehousing and other industries,the market for aerial work platforms has entered a period of rapid development,and its service area is also expanding.As a kind of widely used special equipment of electromechanical and hydraulic integration special operation equipment,scissor aerial working platform is widely used.It uses a shear fork lifting mechanism,which makes the work platform have a larger carrying capacity and improve operating efficiency.The mechanism has the characteristics of simple structure,good flexibility,strong stability,etc.It incorporates a variety of technologies such as mechanical,hydraulic transmission and electrical control,and it meets the requirements of high mobility with a wide range of regional and high-level operations better.This paper bases on the scissor aerial working platform as the research object.Firstly,the mechanical model of shear fork lifting mechanism is established by using the virtual displacement principle,and the mathematical model of constrained reaction force of key hinge points is established by split method,and the model is solved.According to the characteristics of the shear fork lifting mechanism,the kinematics analysis of the shear fork lift mechanism is carried out.In order to solve the problem that the thrust of hydraulic cylinder is too high in the process of lifting,the key structural parameters are optimized by the multi-objective optimization function fminimax.The optimization results show that the maximum driving force of the hydraulic cylinder is reduced by 13.2%,and the lifting acceleration of the working platform is reduced by 42.6%.Secondly,using ADAMS and ANSYS simulation software to establish the multi-rigid body model and rigid-flexible coupling model of the lift mechanism.And dynamic simulation analysis of different hydraulic cylinder are driving conditions respectively.Finally,the hydraulic system is designed based on the analysis of the load condition of the hydraulic cylinder.Analysis of system stability and dynamic characteristics through position control transfer function of hydraulic subsystem.According to the synchronous control strategy of double hydraulic cylinder,the hydraulic synchronous control model is built by AMESim/Simulink,and the synchronous motion of double hydraulic cylinder is simulated.The results show that the displacement difference range between the two hydraulic cylinders is kept between 0?0.97mm,which improves the operating stability of the working platform and the synchronization precision of the hydraulic system,and reduces the demand pressure of the hydraulic cylinder system.