Abstract
A backfilling hydraulic support with six pillars used for working face roof support and goaf backfilling in coal mine is designed, and the structure and working principle of the backfilling hydraulic support are described. In order to improve the working stability of backfilling hydraulic support, the differential equations of motion and the state space model of backfilling hydraulic support are established based on Lagrange method and space coordinate system. According to the support structure and related parameters, the differential equation of motion of the system is solved by MATLAB. The influence law of disturbance frequency and amplitude on the top beam vertical vibration, roll and pitch vibration is obtained. The results show that the vertical vibration and roll vibration of the top beam are more severe in the low frequency range. And the degree of vibration gradually decreases as the disturbance frequency increases. As the disturbance amplitude increases, the vibration of the top beam is more severe. The vibration of the backfilling hydraulic support and the deformation distribution nephogram of the top beam are obtained by the finite element analysis, the validity of the dynamic model is verified by finite element simulation. The results provide the basis for the optimization design and the stability evaluation of backfilling hydraulic support.
Highlights
In order to realize the safe production of coal mine and the green mining of coal mine, people pay more and more attention to the backfilling technology of fully mechanized mining [1, 2]
As one of the important equipment in backfilling mining technology, backfilling hydraulic support can play the role of traditional hydraulic support in fixing support, isolating mining area and goaf
The conveying mechanism and tamping mechanism can be arranged on the backfilling hydraulic support to transport and tamp the filling materials, which can improve the stress state of overlying strata and restrain the roof subsidence [3]
Summary
In order to realize the safe production of coal mine and the green mining of coal mine, people pay more and more attention to the backfilling technology of fully mechanized mining [1, 2]. Xu Junming analyzed the structure of the backfilling hydraulic support, established a mechanical relationship model between the backfilling hydraulic support and the surrounding rock [5, 6]. ESTABLISHMENT AND SIMULATION OF DYNAMIC MODEL OF BACKFILLING HYDRAULIC SUPPORT WITH SIX PILLARS. By analyzing the interaction between the hydraulic support and the direct jack, Qi Fangkun established the force model of the four-pillar backfilling support and calculates the working resistance of the pillar and the jack [9]. The above research mainly focuses on the analysis of the structural stress of the backfilling hydraulic support and its relationship with the surrounding rock, and there are few studies on dynamic models and dynamic characteristics of backfilling hydraulic support. The structure and working principle of backfilling hydraulic support with six pillars are analyzed in this paper. The differential equations are solved by numerical integration method, and the dynamic response of the backfilling hydraulic support under different excitations is obtained
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