Analysis And Experimental Study On The Change Law Of Position And Pose Of High Precision Scissor Lift Platform

The high-precision scissor structure lifting system is a high-precision lifting equipment used in the assembly and testing of satellites.The high-precision scissor structure lifting system has the characteristics of compact installation space,large load capacity,high precision,stable lifting and so on.In this paper,according to the technical index of the high-precision scissor structure lifting system,based on the theory of multibody system dynamics,the mathematical model of position and pose error analysis of the high-precision scissor structure lifting system is created.After that,the static analysis of the lifting system and the lifting system are completed..Based on the mathematical model of position and pose error analysis of the lifting system of high precision scissor structure,some suggestions are given for the structural design and error distribution of the lifting system.First,based on the multi-body system dynamics theory,the mathematical model of the posture error analysis of the high-precision scissor structure lifting system is deduced.According to the structure and working principle of the lifting system of the highprecision scissor structure,various manufacturing and assembly errors of the parts that affect the posture accuracy of the lifting system are analyzed.Combined with the stiffness errors of the parts caused by the force,the mathematical model of the lifting system’s position and pose error analysis is derived.Secondly,the statics analysis of the lifting system of the high precision scissor structure and the stiffness analysis of the working platform are completed.Analyze the force of the lifting system with unbiased load and unbiased load.According to the comparison of two situations,adopt the most conforms to the stress analysis results of this study to lift system components caused by the force deformation were analyzed.Obtained the law that the deformation displacement of the lifting system components changes with the height of the working platform.The stiffness of the working platform of the high-precision scissor lifting system is analyzed,and the law of the stiffness of the working platform of the lifting system varies with the height of the platform is deduced by the piece-by-section rigidity method and the superposition method,and check the rigidity of the working platform through the ANSYS software simulation Whether it meets the requirements and the accuracy of the theoretical analysis results.Then according to the static analysis results of the lifting system of the high precision scissor structure and the stiffness analysis results of the working platform,the errors of the lifting system are reasonably distributed by combining with the calculation model.The final result is verified by simulation software,and the change precision of the lifting system’s position and pose meets the requirements of the design index,which provides a theoretical basis for the error distribution and structural design of the high-precision scissor lifting system.Finally,the test of the lifting system of the high-precision scissor structure is completed.According to the requirements of technical indexes,the posture change precision of the developed lifting system was tested.Due to the complexity of the entire mechanical system,the final equipment only met the design index requirements within a part of the working stroke.Then combined with the safety cushion block,the accuracy compensation scheme was given.After the accuracy compensation of the lifting system,it was finally proved that the accuracy of the equipment mechanical system met the design index requirements.