Research On Cushion Structure Of High-speed Pneumatic Cylinder

In the modern industrial production process, the efficiency of automated production is becoming increasingly important. Cylinder is one of the most common in industrial automation actuators, so high speed is an inevitable requirement. Restraining the cylinder speed how to solve the cushion problem quickly when it is reach the end of travel. Especially when the external conditions of cylinder is changing, the original good cushion state will be destroyed. If we adjust the cushioning to good state again, it is consuming and laborious. Therefore this article focused on the external conditions (speed and load of cylinder) changing, by research of theory and experiment, with mechanical feedback cushion structure to achieve high-speed self-adaptive cushion cylinder. Moreover, the effective cushion structure can determine what changes in external conditions, automatically adjust itself for this change to achieve effective cushion.In this paper, the analysis of cylinder characteristic cushion is beginning, using experimental experience, analyzing the characteristic of cushion cylinder and the reason of cushion failing. Then doing research on the friction of cushion cylinder, by means of a large number of experiments to measure it, fitting the variation formula. By means of deflation method, measuring the speed changing valve in test rig, coming out with fitting variation formula of effective area, which made simulation more accurate.Improving traditional ways of cushion, based on MATLAB, making process in modeling and simulation analysis, coming out with the area curve which can exhaust air in cushion chamber. Towards the structure designing previous, using simulation in fluent and modifying the size for the new structure. With using pressure cylinder of intake chamber, adaptive cushion is achieved. Completing production process, with a lot of experiments, it can be verified that when speed changing±11% and load changing ±44% the new structure has a good ability to adapt the conditions changing in a certain range.