冲击载荷下液压支架立柱的受载特性研究

为了研究液压支架立柱受顶板下塌作用易胀缸的问题,使用重锤法来模拟顶板下塌对立柱产生的冲击载荷作用;根据弹簧串联原理推导了完全伸出状态下双伸缩立柱的刚度公式,并进一步得到了立柱液压缸内的压力公式,将重锤冲击立柱的动态加载转变为立柱液压缸内的液压静态加载;使用Workbench仿真得出了立柱的应力、变形云图,得到了立柱的最大受载点在二级缸上且该点位于靠近活柱活塞处,一级缸的最大受载点位于缸底处;通过公式计算及Workbench仿真,得到了随着冲击速度增加立柱最大应力值增大以及随着立柱液压缸内乳化液液柱高度增加立柱最大应力值减小的结论。为立柱强度设计及立柱冲击试验提供重要依据和理论指导。

Study on Load Characteristics of Hydraulic Support Column under Impact Load

In order to study the problem that the hydraulic support column is easy to expand under the action of the roof collapse,the heavy hammer method was used to simulate the impact load of the roof collapse on the column.According to the spring series principle,the stiffness formula of the double telescopic column in the fully extended state was deduced,and the pressure formula in the column hydraulic cylinder was further obtained.The dynamic loading of the hammer impacting the column was transformed into the hydraulic static loading in the column hydraulic cylinder.Using Workbench simulation to get the stress and deformation cloud diagram of the column,obtained that the maximum load point of the column is on the secondary cylinder and this point is located near the piston of the movable column,and the maximum load point of the primary cylinder is at the bottom of the cylinder.Through formula calculation and Workbench simulation,concluded that the maximum stress value of the column increases with the increase of the impact speed and the maximum stress value of the column decreases with the increase of the height of the emulsion liquid column in the pressure cylinder,which provides important basis and theoretical guidance for column strength design and column impact test.