Journal of South China University of Technology (Natural Science Edition) ›› 2016, Vol. 44 ›› Issue (11): 90-96.doi: 10.3969/j.issn.1000-565X.2016.11.014

• Mechanical Engineering • Previous Articles     Next Articles

A New Cushion Device for High-Speed Pneumatic Cylinder and its Performance

ZHANG Ri-hong1,2 DU Qun-gui1   

  1. 1.School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China; 2.Faculty of Mechanical and Electrical Engineering,Zhongkai University of Agriculture and Engineering,Guangzhou 510225,Guangdong,China
  • Received:2016-01-11 Revised:2016-06-01 Online:2016-11-25 Published:2016-10-04
  • Contact: 杜群贵( 1965-) ，男，教授，博士生导师，主要从事机电工程现代设计方法研究． E-mail:ctqgdu@scut.edu.cn
  • About author:张日红( 1980-) ，男，博士生，副教授，主要从事机电系统传动与控制研究． E-mail: zrh-neu@163． com
  • Supported by:
    Supported by the Science and Technology Planning Project of Guangdong Province，China( 2013B010203016)

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Abstract:

For the cushion device of the high-speed pneumatic cylinder with a pressure release valve,the speed variation range of pneumatic cylinder piston is narrow,and to achieve optimum cushion conditions is difficult.The main reason is high compressibility of gas.Specifically,when the opening conditions of the pressure relief valve are met,it cannot always keep open before the cylinder arrives at a stroke,and thus the phenomenon of repeated opening and closing is universal.At the same time,the exhaust speed of the valve cannot adapt with the running speed of the piston.In order to solve these problems,a new cushion structure mainly composed of pressure release cushion components and adjustable clearance components is proposed.Then,through the simulation analysis,it is demonstrated that when the mass of moving parts in the pneumatic cylinder is 6 kg,a better cushion for the top speed of the pneumatic cylinder within the range of 2.3 ～ 3.7m/s can be achieved by means of the segmented regulation of both the spring compression amount of the pressure release valve and the clearance volume of the back pressure cavity.Finally,at a maximum velocity of pneumatic cylinder piston of 3.0 m/s,a further simulation is performed by changing the mass of moving parts.It is found that the new cushion structure still has better cushioning and regulating performance when the load mass is changed.

Key words: high-speed pneumatic cylinder, cushion device, cushioning performance, simulation