| As a machine to prepare adobe for a setting machine’s palletizing, the adobe grabbing machine plays an important role in the brick factory automation equipment. Pneumatic clamp device is a part of the adobe grabbing machine and is the directly part to carry the green brick. Meanwhile, the guide rod of the pneumatic clamp device is been used as the guide of catch plate sliding and a bearing bar under load operating conditions. Thus the pneumatic clamp device and the guide rod blanks research work stress state has practical significance. Due to the alternating load applied on it, the guide rods is prone to fatigue damage and fracture. After the elaboration of finite element theory fatigue cumulative damage theory. And though corresponding wall thickness and other supporting department to improve the using life of guide rods.Firstly, choosing the research object and establishing the solid model of folder blank system and pneumatic devices. After casting machine to grab the mechanical structure and presentation folder blank pneumatic means the force of the two conditions for easy analysis the introduce the system. After simply analysis of the grasping adobe system, limited element method was used to analysis the two working condition. Both the results showed that the max stress located at the region which was pressed by screw.Secondly, The fatigue life of guide rods was calculated though five block diagram method by combining the FEM results, load spectrum, S-N curve of material and the nominal stress method. The draw of the guide rod’s fatigue life and the minimum fatigue life was got after the analysis.Thirdly, Through the analysis of main factors of guide rods’fatigue life, and with the aid ofthe corresponding models and data we have the laws of pressing force F, pressed area S, and the wall thickness t with the maximum stress. From these main factors, focusing on the thickness of the guide bar’s re-selection, and improved targeting axial guide rods to increase the pressure area for reducing the maximum stress. The fatigue life of the guide rod under the wall thickness and the axial positioning structure is verified, and the feasibility of the scheme is proved to improve the fatigue life of the guide bar. |
