特大采高液压支架底板比压分析研究

Analysis of Floor Pressure of Hydraulic Powered Support for Ultra High Mining

为分析对比特大采高液压支架在不同工况下的底板比压分布,首先建立支架在正常工作加载、柱窝上方横向(纵向)加载、顶梁两端加载、顶梁前方(后方)扭转加载和顶梁受偏载几种工况下的原始三维模型,利用HYPERMESH对支架顶梁、掩护梁和前后连杆进行柔性化预处理,最后由多体动力学软件ADAMS建立支架的数值仿真模型。工作阻力由垂直施加于各种工况顶板的主动外载荷提供,并通过碰撞接触将外载传递给顶梁,然后经由弹簧阻尼系统等效替代的立柱及平衡千斤顶和由"旋转副"进行连接的支架各处铰接点传递到支架底座,最后由建立在底座底部的四排弹簧来平衡主动外载,使整个系统达到稳定。通过测取底座底部四排弹簧的力,可得支架在不同工况下的底板比压分布情况。结果表明:支架在不同工况下的底板比压分布情况各有异同;但整体来看,底座前端底板比压较大。

In order to analyze and compare the specific floor pressure distributions under different working conditions of hydraulic powered support for ultra high mining, a three-dimensional model of hydraulic support under normal working load, transverse （longitudinal） load above the column socket, load on both ends of the top beam, torsional load in front of the top beam （rear）, and deviated load of the top beam was first established. The roof beam, cover beam and front and rear connecting rod were then preprocessed by using HYPERMESH. A numerical simulation model of the support was finally established by using the multi-body dynamic software ADAMS. The working resistance was provided by the active external load that was applied vertically to the roof of various working conditions, and the external load was transferred to the top beam through collision contact. It was then transferred to the support base through the column and the equilibrium jack which are equivalent replacement of the spring damping system and through the articulation points of the support connected by the rotary pair. The active external load was finally balanced by the four rows of springs set up at the bottom of the base to make the whole system stable. By measuring the force of the four rows of springs at the bottom of the base, the specific floor pressure distributions under different working conditions were obtained. The results show that the specific floor pressure distributions are different under different working conditions, but on the whole, the front floor pressure is larger than that in other places.