关键词: 液压支架, 加载条件, 承载状况, 铰接点载荷

Abstract: The underground mining environment is complex and diverse, and the stress state of hydraulic support is severe, which puts forward higher requirements for the bearing performance of hydraulic support. In order to study the bearing capacity of hydraulic support under different loading conditions, the change trend of hinge point load of hydraulic support is analyzed. Based on ZF5600/16.5/26 top coal caving hydraulic support as an example, the dynamic model of the hydraulic support is established by using LS-Dyna, the rigid joint area is established at the hinge, and the rotation pair connection is defined to transfer the force. Subsequently, combined with different loading forms and loading conditions, the numerical simulation analysis of hydraulic support was carried out. The results show that the stress concentration of top beam is in the front column nest and the rear column nest under internal and external loading, respectively; the load of hinge point fluctuates greatly and the peak value is much larger than the stable value under internal loading; under eccentric loading condition, the load fluctuation of hinge point is the most violent; in different working conditions, the load at the hinge point of the rear connecting rod needs the longest stability time in the force transfer process. The research results can provide reference for structural strength design and reliability analysis of hydraulic support.