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A Modelling of Cyclic Thermal and Impact Loads on Excavator Bucket


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DOI: https://doi.org/10.15866/ireme.v15i4.20699

Abstract


Open brown coal mining is usually complicated with high temperatures of coal massif, caused by spontaneous combustion, which significantly accelerates wear rate and resource consumption of excavator bucket. During excavation of hot coals, subjected to spontaneous combustion, excavators work in extreme conditions, which lead to a great reduction of their service life. In order to prolong excavators’ service life, repair and maintenance techniques are employed in mines. However, making a proper schedule of those techniques in such dangerous mines is a difficult task. This is also aggravated by a lack of techniques of in-situ resource analysis. In this study, an attempt to assess resource consumption rate of a hydraulic excavator bucket, working at excavation of self-ignited coal, has been made. In order to calculate the resource of a bucket, a computer model of the bucket fatigue life assessment has been made, using finite element analysis. Proposed model allows calculating stresses, induced during one digging cycle, and assessing residual resource of the bucket, which is related to its resource. It has been determined that thermal loads significantly accelerate bucket resource consumption, especially the bottom part of the bucket and the tooth caps. According to the research, tooth caps will fail after 253 hours of digging, and bottom part after 102 days. It has been concluded that, in order to increase service life of excavators operating in mines subjected to spontaneous combustion, it is necessary to revise the existing maintenance and repair system.
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Keywords


Coal; Excavator; Finite Element Method; Maintenance Techniques; Residual Resource; Thermal Fatigue; Tooth Caps

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References


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