大型自移式破碎站钢结构落料冲击系数研究

Research on blanking impact coefficient of steel structure in large self-mobile crushing station

基于虚拟样机技术及有限元法,提出了破碎站钢结构的力学模型等效及落料冲击系数的数值模拟方法,采用理论公式对单块物料冲击钢结构的动载系数进行计算,并将其与数值模拟分析结果对比。分析表明,1 m3大小的正方体煤岩物料从5 m高度下落直接冲击钢结构,其冲击系数的理论计算及刚体动力学分析结果均为123,而柔体动力学分析结果为125,三者误差约1.6%,表明提出的数值模拟方法及钢结构等效模型有效,分析方法可为破碎站的性能评估及结构优化提供基础。

Based on the virtual prototype technology and finite element method, a mechanical model of the steel structure of crushing station and a numerical simulation method of blanking impact coefficient were proposed. Then the dynamic load coefficient of a single material was calculated by theoretical formula, and it was compared with the numerical simulation result. When a cubic coal rock of 1 m^3 hit the steel structure directly from a height of 5m, the theoretical impact coefficients and rigid body dynamic results were 123, while the flexible body dynamic analysis result was 125, the error of which being about 1.6%. It is indicated that the numerical simulation method and the equivalent model of the steel structure are effective, and the analysis method can provide a basis for the performance evaluation and structure optimization of the crushing station.