Numerical Modeling And Working Parameters Optimization Of Hydraulic Impact System Of Valve Sleeve Type Rock Drill

Hydraulic rock drill is a kind of important engineering machinery. It is widely used in construction projects which is a mining, railway and highway. It can effectively accelerate the construction schedule and reduce the labor intensity. Sleeve valve type hydraulic rock drill is regarded as the research object in this paper. Based on the three sections of analysis, the power bond graph theory, and stress wave method, the research of impact mechanism structure design, hydraulic impact system numerical modeling and working parameters optimization are carried out. The main research work are as follows:Based on the three sections of analysis,the impact energy and impact frequency of hydraulic rock drill are regarded as the design goal, the structure size and movement parameters of piston are calculated, and theoretical basis is provided for the simulation model parameters setting of sleeve valve type rock drill.Based on stress wave method, the impact performance experimental system of hydraulic rock drill is build, and stress wave curve is obtained. Impact energy and impact frequency are indirectly received by stress wave calculation, and validation basis is provided for the AMEsim simulation results analysis of hydraulic impact system.The AMEsim simulation model of hydraulic impact system is established on the basis of power bond graph theory. The movement curves of piston and sleeve valve are obtained by simulation, and their motion law is minutely analyzed. The influence of hydraulic rock drill working parameters on the impact performance is studied, which are system oil rate, relief valve setting pressure, high pressure accumulator charging pressure.The response surface model is established among hydraulic impact system efficiency, system oil rate, relief valve setting pressure, and high pressure accumulator charging pressure, based on orthogonal combination design method. The maximum efficiency of hydraulic impact system is considered as the optimization goal, the working parameters of hydraulic rock drill are optimized by adopting multivariate nonlinear programming method. The optimized efficiency of hydraulic impact system is increased by 17.7%, and theoretical basis is provided for the work parameters selection of hydraulic impact system of sleeve valve type rock drill.In this paper, Theoretical basis is provided for the structural design and optimization of sleeve valve type hydraulic rock drill, and improving the efficiency of hydraulic impact system is of great significance.