Analysis and optimization of the working parameters of the impact mechanism of hydraulic rock drill based on a numerical simulation

An impact system is the core part of the hydraulic rock drill. The dynamic simulation model of the hydraulic impact system is established based on the system simulation platform AMEsim. We used the AMEsim simulation model to verify the displacement, velocity curves of the piston, and valve by using stress wave testing data. The following key features of the impact system are determined: the characteristic curves of the pressure variations in the piston chambers, the influences of oil flow, the charging pressures of the high-pressure accumulator, the pre-setting pressure of the relief valve on impact performance, and impact efficiency. On the basis of orthogonal experiments, a response surface method is used to build a mathematical model of the impact system with efficient and various working parameters. The impact system with an optimal efficiency is designed, and the working parameters are optimized. Our proposed system efficiency increases by 17.7% after the working parameters are optimized. This study provides a theoretical basis for the design and optimization of the impact system parameters of the hydraulic rock drill with a sleeve valve.