滚筒式采煤机截割部壳体热结构耦合分析

Analysis on Thermal-Structure Coupling of Shearer Cutting Unit Case

为研究热载荷和力载荷对滚筒式采煤机截割部壳体应力和变形的影响,建立了MG300/700-WDK采煤机截割部壳体的热结构耦合模型,在壳体热稳态温度场分析的基础上对壳体进行了热结构耦合分析。热结构耦合分析结果表明:壳体温度最大值出现在高速级轴承座孔处,且壳体上下壁面温差为7℃;与截割部壳体静力学分析结果相比,考虑热效应的壳体最大应力增大30.3%,最大变形增大93.3%。在截割部加载试验台上进行加载试验,对壳体的温度和惰一轴孔位置处应力变化进行测量,试验结果表明数值分析与试验结果有良好的一致性。

In order to investigate influence of thermal and force load to stress and deformation of shearer cutting unit case, thermal-structure coupling model for MG300/700-WDK shearer cutting unit case was established, and thermal-structure coupling analysis was conducted based on temperature filed analysis. The analysis results indicated that the largest temperature value appeared around the high-speed level bearing bore and temperature difference between the upper wall and the lower wall was 7 ℃. Compared with the statics analysis result for the cutting unit case, the largest stress and the largest deformation of the cutting unit case had respectively increased by 30.3% and 93.3% when considering thermal effect.Stress change at idler shaft bore and temperature of the cutting unit case were measured when loading test conducted on the loading test bench for the cutting unit case, which indicated that numerical simulation analysis had a good consistency with test results.