大采高工作面刮板输送机中部槽断裂原因分析
Analysis on Breaking Causes of Middle Pans of Scraper Conveyor in Fully-Mechanized High Cutting Coal Mining Face
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摘要: 针对补连塔煤矿7 m大采高工作面刮板输送机中部槽易断裂的问题,对中部槽的运动轨迹进行分析得到其工况,按照刮板输送机中部槽的主要工况对应的受力情况对其进行压力试验,比较中部槽材料成分以及机械性能,得到中部槽断裂的主要原因。结果表明:中部槽实际的断裂和变形结果同有限元分析结果相符合,通过压力试验分析得到中部槽的最大应力位置,压力增大到4 330 kN时中部槽凸头与槽帮过渡部位有开裂趋势,同时哑铃销座凹头窝中部有开裂趋势,并对该中部槽断裂部位进行元素分析,可知Si、Mn、Cr、P和Mo等元素偏高直接影响了中部槽的硬度,导致中部槽易于断裂。Abstract: According to the easy breaking problem of the middle pans in the scraper conveyor of a 7 m high cutting coal mining face in Bulianta Mine, the motion tr aces of the middle pans were analyzed and the performances were obtained. According to the main performances of the middle pans in the scraper conveyor, a pressur e test was conducted on the related stressed conditions, the material composition and mechanical performances of the middle pan were compared and the main breakin g causes of the middle pan were obtained. The results showed that the actual breaking and deformation results of the middle pan were ftted to the results of the finite e lement analysis. The pressure test analysis showed the max stress location of middle pan. When the pressure increased to 4 330 kN, the convex head of the middle pa n and the transition part of the pan sidewall would be in a cracking tendency. Meanwhile, the middle part of the concave head in the dumbbell key seat would be in a cr acking tendency. An element analysis was conducted on the breaking part of the middle pan. The analysis showed that an overhigh content of Si, Mn, Cr, P, Mo and oth er element would directly affect the hardness of the middle pan and could cause the easy breaking of the middle pan.
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