Finite Element Analysis For Cutting Arm On EBH360Roadheader

Roadheader, whose development improves the tunneling speed and efficiency of minetunnels greatly, is commonly used equipment in drifting tunnel. In the adverse workingenvironment, the load fluctuation range of cutting mechanism that with complexity of stressis large during working process. Meanwhile the large vibration has an impact to the strengthof the machine parts. For the production efficiency and mechanization degree couldimprove greatly, better adaptability and higher stability for working environment is neededto boring machine.This paper study on EBH360cantilevered boring machine’s cutting arm. During workingprocess, the cutting arm is forced by various resistances, such as tangential resistance,incremental launching resistance, normal resistance whose direction is uncertain, and thedynamic load. The work performance and the stability of the whole machine are determinedby the rational structure of boring machine. And deficient structure strength and stiffnesswill decrease the cutting performance and cause fatigue break. With stress analysis andstrength check of components of cutting arm, this paper optimized the design and improvedthe structure for stress concentration and hazardous areas. Details are as follows:1) The work process and the principles of the boring machine were analyzed to determinethe condition load that use to calculate static strength of structural components. Accordin tothe analysis, four dangerous condition were determined which are the cutting arm in theposition of the horizontal, the vertical force maxium, the highest, the lowest, respectively.2) Pro/e is a3D modeling software that was used to establish three-dimensional solidmodel of cutting arm. And the ANSYS, a finite element analysis software, was used in thefinite element analysis of above mentioned conditions. The analysis suggests that duringworking the parts that easy to damage include the outer cylinder, the axle sleeve and thebackseat plate.3) According to the result of finite element analysis, for the specific position of the maximum stress, various parts were designed and modified. Then the finite element analysismodel that was modified was established. The analysis of the condition that cutting arm inthe horizontal position suggests that the stress of the modified model decreased significantly,which meets the design requirements.