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Analysis of the axle fracture of the bucket wheel excavator

机译：斗轮挖掘机轴断裂分析

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摘要

The common design of the bucket wheel drive mechanism in some bucket wheel excavators (BWE) consists of a gearbox and a hollow shaft, while the bucket wheel is supported by the axle passing through the hollow shaft. Improper maintenance and inadequate elimination of axis misalignment of the hollow shaft and the bucket wheel axle are the main causes of excavator failure and axle fracture. The paper examines the causes of bucket wheel axle fractures. Experimental testing of the chemical composition and mechanical properties of the material used to make the bucket wheel axle and metallographic inspections of the fracture surfaces in the bucket wheel axle by means of electronic and light microscope carried out in the first part of the paper have shown that there are no significant inhomogeneities and errors in the material of the axle. The second part of the paper presents the FEM analysis of influences of disturbances on the manner of support of the bucket wheel axle on the fracture. It shows that the negative influences of support of the axle reflected through the increase in the stress concentration and occurence of the initial crack are the main causes of the axle fracture.
机译：在一些斗轮挖掘机（BWE）中，斗轮驱动机构的常见设计包括齿轮箱和空心轴，而斗轮由穿过空心轴的轴支撑。维护不当和空心轴与铲斗轮轴的轴心不完全消除是导致挖掘机故障和轮轴断裂的主要原因。本文研究了铲斗轮轴断裂的原因。在论文的第一部分中进行的用于制造斗轮轴的材料的化学成分和机械性能的实验测试以及通过电子显微镜和光学显微镜对斗轮轴的断裂表面进行金相检查的结果表明：轴的材料没有明显的不均匀性和误差。本文的第二部分介绍了有限元分析法，分析了扰动对斗轮轴在断裂处的支撑方式的影响。它表明，通过应力集中的增加和初始裂纹的出现所反映出的对轴支撑的负面影响是造成轴断裂的主要原因。

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