Analysis And Research On Cylinder Dynamics And Buffering Performance

As a new mechanical transmission technology,pneumatic technology has been widely used in various fields of production automation after more than 200 years of development.As the most widely used executive component in pneumatic system,high speed has become an urgent need and inevitable direction to improve industrial automation production efficiency.However,the high-speed running cylinder will easily produce vibration and impact when it stops at the end of its stroke,seriously shortening the service life of the cylinder.Therefore,the buffer problem of the high-speed cylinder at the end of the stroke has become a key technical problem restricting its rapid development.The main research content of this paper is to comprehensively analyze and study the dynamic characteristics and buffering performance of high-speed cylinders through the method of combining theory with experiment,and then put forward the methods to improve the buffering performance of high-speed cylinders.Based on the theory of gas dynamics and thermodynamics,the dynamic theoretical models of different stages of the high-speed cylinder’s movement process are established: start-up stage,acceleration stage,buffer deceleration stage and residual pressure and exhaust stage.Simulink module and GUI module in MATLAB are used to establish a simulation calculation model with friendly interactive interface according to the theoretical model,and the dynamic characteristics of the high-speed cylinder are simulated and analyzed.The test system of cylinder dynamic characteristics is designed and built,including the design of pneumatic circuit,the installation of test bench and the compilation of measurement and control program,which provides a test basis for the verification of theoretical simulation model and the research of high-speed cylinder buffer performance.Furthermore,the dynamic parameters of the high-speed cylinder during operation were tested and compared with the test results,which verified the correctness of the simulation model.On the basis of the previous theory and experiment,the buffer state of the high-speed cylinder and the buffer capacity of the traditional relief valve buffer structure are further analyzed,and according to the test results,the deficiency of the buffer adjustment capacity of the relief valve is pointed out.Furthermore,the genetic algorithm is used to optimize the structural parameters of the relief valve.Through the comparison and analysis of the simulation results before and after optimization,it shows that the buffer performance of the high-speed cylinder after structural optimization has been improved to a certain extent.Finally,in order to further improve the buffering performance of the high-speed cylinder,a new buffering structure scheme with back pressure control is proposed and the corresponding structure design is carried out.According to the designed structure,the corresponding dynamic simulation model is established and simulated.The analysis results show that the back pressure control buffer structure can ensure the high-speed cylinder to realize good buffer during high-speed operation,and has better buffer adjustment capability than the traditional relief valve buffer structure.The research results in this paper show that the buffer performance of high-speed cylinder is improved by structural optimization design and back pressure control buffer structure.The feasibility of the two methods is analyzed by theoretical simulation model,which provides a certain theoretical reference for the design and development of high-speed cylinder buffer structure in the future.