Research Of A Pneumatic-water Hydraulic Intensifier Cylinder With Long Power Stroke

With the development of the booming economy in our country,industrial automation has been developed rapidly and the pneumatic-hydraulic intensifier cylinder is also widely used.In this paper,in order to promote the application of the pneumatic-hydraulic intensifier cylinder in more fields,the pneumatic-hydraulic intensifier cylinder with a power stroke of 100 mm is designed.First of all,according to the technical requirements,this article puts forward the overall technical scheme of the pneumatic-hydraulic intensifier cylinder with big power stroke by comparing the advantages and disadvantages of various pneumatic-hydraulic intensifier cylinders available.Based on the theoretical analysis,important parameters which have great effect on the power stroke are found,then the design of the pneumatic-hydraulic intensifier cylinder with big power stroke is completed.Secondly,the mathematical model of the three working stages of the pneumatichydraulic intensifier cylinder is established.The simulation by the software AMESim is conducted on the three working process of the pneumatic-hydraulic intensifier cylinder,and the changes of the parameters in the three working process are clearly shown.The Simulation results show that the time consumed in the fast load free stroke and the return stroke is very short,but the time used in power stroke is long.Some effective measures to improve the efficiency of the pneumatic-hydraulic intensifier cylinder are found.Some shortcomings of the original control mode are revealed by simulation,then an optimal control scheme is put forward and validated by simulation.Thirdly,a new kind of structure in which an ejection spring is installed at the end of the pneumatic-hydraulic intensifier cylinder is found,which can improve the speed of the pneumatic-hydraulic intensifier cylinder in the power stroke to shorten the time of the power stroke and improve the efficiency,then the stiffness and the compression of the spring are optimized by AMESim simulation.Finally,the parameters and the content for the experiment process are defined,then the design of the experiment is completed.