Research On Internal Flow Of Key Components Of Hydraulic Support And Operating Characteristics Of Its Hydraulic System

As the main security support equipment in the coal face, hydraulic supports have decisive significance on constructing the intrinsically safe mine.The structure, performance and the quality of the overall dynamic performance of the key components will affect the reliability and security of the whole coal face. Due to a lack of appropriate theoretical support and the experiments, the study of the hydraulic support for key components (check valve and safety valve), the flow field within hydraulic support system, flow rule and the dynamic properties of their respective is inadequate.This paper have taken the theoretical analysis, calculation, FLUENT and ABAQUS simulation, Matlab/Simulink simulation and experimental study aiming at the common ZY4000/09/21 hydraulic support. And it has analyzed the factors which will affect the key components of hydraulic support and system stability in all domains.Firstly, since the outstanding performance of the relief valve and check valve in the hydraulic support system, the paper establishes the role of three-dimensional flow model, using FLUENT, the computational fluid dynamics software, to simulate the relief valve and check valve aiming at studying the internal-flow-impact on the performance.Secondly, key components of hydraulic supports and hydraulic system dynamics have been analyzed dynamically by constructing mathematical model of the system, through theoretical analysis and using dynamic bond graph method combined with digital simulation software Matlab / Simulink respectively.Again, the material key components of the support and the support systems have been studied based on flow role of the key components in the hydraulic support simulation and the overall system dynamic performance simulation. It has studied the various properties of hydraulic of check valve, safety valve and analyzed the force condition of the support in the work process by means of simulating work environment and conditions in the site operating conditions.Finally, the paper holds that: bedrock subsidence is greater than the pressure, which is the main reason for the accident by analyzing the crushing accident in the applied process. It analysis the descending amount of piston when the roof pressure receives the coupled affect of the roof strata and the flow of seepage fluid by using the theoretical calculation and flow-mechanical model with software ABAQUS simulation.This paper revealed the flow role of key components of hydraulic support and internal system and the dynamic characteristics using numerical analysis and simulation. It has identified the weak parts in the support, and has offered the relationship between bedrock sinking and pressure support and specific prevention measures aiming at the typical crushing accident through theoretical calculation and numerical simulation. This paper has an important guiding significance on the design of hydraulic support, maintenance, troubleshooting and incident handling of.