| Pneumatics is an industry technology that transfer power and control signals to control or drive mechanical devices and equipment. Now, Welding guns with pneumatic servo system have abroad application in auto industry for cheaper prices, good welding quality, high efficiency, and so on. Currently, welding pneumatic servo system has some characters during production, such as: high failure rates, unstable, due to compression character of air, nonlinear and time varying of pneumatic servo system, and so on. So the application of pneumatic servo system is emphasis that is the study of developers and engineers on industry area concern.This paper develop the accuracy mathematic model, and analyze the factors that influence the stability of welding gun pneumatic servo system in theory according to the accuracy mathematical model, and then summarize the methods to improve the stability of welding pneumatic system with knowledge from actual working, and use appropriate control methods to control pneumatic servo system stably.First, this paper introduces the pneumatic technology, and the characters, current status and trend of pneumatic servo system, and then introduces welding pneumatic servo system and pneumatic circuits briefly. Second, this paper build mathematic models of welding pneumatic system, and analyze stability of welding pneumatic servo system from two aspects(theory and control of pneumatic and electric) with the mathematic model, and propose the control strategies to improve stability of pneumatic servo system. Finally, this paper design the welding pneumatic servo system from three directions that are electronic control design, pneumatic circuit design and EMC design, and propose comprehensive measures to improve system stability. |
