Research On An Electro-pneumatic Hybrid-driven Actuator And Its Characteristics

In the process of industrial production,all kinds of mechanical systems are the necessary tools and important guarantee for increasing productivity.Whether it is a large industrial equipment,cargo logistics carrier,or small household facilities,precision measuring instruments,are required to have proper mechanical systems to complete the motivation.The motion of the mechanical system is accomplished by a variety of actuators,which are the core components in the mechanical system.And an excellent actuator,with good performance,simple structure,is a great guarantee for mechanical system productivity.The diversification of production determines the diversification of the actuator.Some need rotary actuators,and some need to do linear motion,and some need move far,and some require high precision,and some need to carry large loads,some require small size.Among in linear actuators,there are many mature actuator such as hydraulic cylinder,cylinder,linear motor,etc.Hydraulic cylinder focuses on the large load,mainly used in heavy machinery.The cylinder focuses on the speed,is the ideal high-speed actuator.Electric cylinder focuses on accuracy,relatively easy to achieve high-precision control.However,with the application of the actual scene becoming increasingly complex,the comprehensive performance of the actuators are increasing,including the speed,the precision and bearing capacity,etc.How to meet the requirements of high precision and fast execution under the premise of a certain bearing capacity is another key and difficult point in the research of linear actuator.In view of the above facts,this paper presents a new type of electropneumatic hybrid-driven actuator,which combines the advantages of the motor and the cylinder.There is a special designed coupling mechanism,which allow the pneumatic cylinder part to accomplish the most of the total stoke,and then connected with the motor,which would subsequently complete the remaining small part of the total stroke.So it can achieve high accuracy and high speed performance simultaneously.The main contents of this paper are as follows:Firstly,this paper introduce the basic principle of the electro-pneumatic hybrid-driven actuator.According to the goal to be achieved,this paper combined the the advantages of the motor and the cylinder.Secondly,the mechanical structure design of the gas electric hybrid actuator is carried out.The mechanical part of the actuator,the cylinder part,the coupling part and the mechanical structure of the sealing part are designed in detail.Thirdly,according to the characteristics of the actuator to be studied,the modeling and Simulation of the actuator system is carried out.AMESim and MATLAB co-simulation based on the performance of the actuator is analyzed,compared with cylinder and motor model.Finally,a real electro-pneumatic hybrid-driven actuator prototype is produced.And also the experiment platform is built too,including the control system with the myRIO controller as its core.Control and data acquisition program is written with LabVIEW.Analysis is made out according to the experiments.The experimental results show that the proposed electro-pneumatic hybrid-driven actuator can achieve the desired design goals,compared to the cylinder,greatly enhance the positioning accuracy;compared to the linear motor,greatly enhance the speed of execution.