电弧炉电极升降系统静态刚度分析

Static Stiffness Analysis for the Electrode Lifting System of Electric Arc furnace

为了准确的计算电弧炉电极升降系统刚度特性,基于有限元理论,提出了一种电极升降系统刚度特性数值计算方法。建立了电弧炉电极升降系统静态刚度计算模型,根据实际冶炼工况,首次定义了三种方向电极升降系统刚度。计算分析了横臂与立柱链接螺栓预紧力,立柱上升高度以及关键结构设计参数立柱直径对电极升降系统三种刚度的影响规律。结果表明螺栓预紧力的增加及立柱直径的增大会使得各向系统刚度增加,然而立柱上升位置的提高使得系统刚度降低,尤其是垂向和扭转刚度。与螺栓预紧力及立柱上升高度因素相比,立柱直径变化对系统各向刚度影响较大。研究结果对电弧炉升降机械系统的结构设计以及下一步的动力学特性分析具有重要的指导意义。

In order to calculate the stiffness characteristics of the electrode lifting system of electric arc furnace, a numerical computation method was proposed based on the finite element theory. Using the proposed method, the static stiffness model of the electrode lifting system was created and three types of stiffness of the system were defined according to the actual melting process. Then the influences of the bolt pretightening force, the column elevation and the key design parameter which is the column diameter on the systematic stiffness were investigated. The results show that the increase of the bolt pretightening force and the column diameter can increase the systematic stiffness. However, the increase of the column elevation can decrease the systematic stiffness especially for the transverse and torsional stiffness. Compared to the bolt pretightening force and the column elevation, the column diameter has a stronger effect on the systematic stiffness. Results of this study can be applied to guide the structural design of the electrode lifting mechanical system and provide a theoretical foundation for subsequent dynamic analysis.