Impact performance for high frequency hydraulic rock drill drifter with sleeve valve

Abstract

Abstract A high frequency hydraulic rock drill drifter with sleeve valve is developed to use on arm of excavator. In order to ensure optimal working parameters of impact system for the new hydraulic rock drill drifter controlled by sleeve valve, the performance test system is builtusing the arm and the hydraulic source of excavator. The evaluation indexes are gained through measurement of working pressure, supply oil flow and stress wave. The relations of working parameters to impact system performance are analyzed. The result demonstrates that the maximum impact energy of the drill drifter is 98.34J with impact frequency of 71HZ. Optimal pressure of YZ45 rock drill is 12.8 MPa-13.6MPa, in which the energy efficiency reaches above 58.6%, and feature moment of energy distribution is more than 0.650. Keywords : rock drill drift, sleeve valve, energy efficiency, impact energy, feature moment of energy distribution 1. Introduction Hydraulic rock drill drifter is a tunnel construction and mining device widely used in projects of mining, railway and highway construction. It supplies basic condition to speed up project construction, and reduce intensity [1-2]. At presentlabor , the use of hydraulic rock drill drifter need special propeller under limit of structure and inverse impact force in drilling process, which makes self-propelled drill frame have large work range with high cost, or low cost with small work range[3-4]. Excavator is widely used earthwork excavating equipment with a large range arm. Development of the hydraulic rock drill drifter adjusted used on excavator can extend the working range of the drill and increase the additional value without cost increase. owever, under Hrestrain of the arm in excavator, the hydraulic rock drill drifter used in excavator must be with compact structure, small volume and light weight. The hydraulic rock drill drifter has two types according to structure of flow distributing valve [5]. Spool valve is used by one type, and sleeve valve used by the other. and sleeve valve installedPiston on the same axis in hydraulic rock drill drifter controlled by sleeve valve, which makes volume of the drifter smaller, weight lighter and structure more compact [6]. In the paper, a high frequency hydraulic rock drill drifter with type YZ45 will be designed, which uses sleeve vale to control flow distribution.