Analysis Of The Hydraulic System Of The Hydraulic Rock Drill Rig

The research object of the paper is the product BOOMER 282 of Atlas Copco, analyses the structure of the hydraulic rock drill rig and the main hydraulic systems, focuses on the analysis of the hydraulic outrigger, the amplitude system of the double triangle boom and the impact system of the hydraulic rock drill.The operational principle of the hydraulic outrigger was illustrated, and set up the model of the extending and retracting system of the outrigger with the simulation software AMESim, then find the influence of rotate speed of the engine, the system pressure and the displacement of the hydraulic lock to the extending and retracting efficiency of the outrigger.To make the boom orientation accurately, the amplitude system of the double triangle boom was analyzed, then combine the virtual prototype with the model of the hydraulic system. The output pressure and rate of flow of pump respond the variety of load quickly, the velocity and displacement of the supporting cylinders and pitching cylinders are coincide with the movement of the virtual prototype, and its force is coincide with the fact, The simulation has showed: the models are true and the method of co-simulation that could combine the amplitude mechanism of the double triangle boom with its hydraulic system is a method of modeling and simulation.The impact system of the hydraulic rock drill was analyzed: the three-position and four-way core valve was the research object, set up the model of the control valve and the cylinder with HCD in AMESim. In the condition of the rate of flow invariableness of the pump, batched the masses of the valve, fraction area of valve, strokes of valve, volume of chamber, aperture of the cylinder and the rate of flow separately, and then discovered the influence of them to the impact performance. The simulations above show: in the design of the hydraulic rock drill rig , enther chooses larger displacement of the hydraulic lock or increases the system pressure could improve the extending and retracting efficiency of the outrigger;Keep the pitching cylinders and the supporting cylinders parallel in the initial position and make the ratio of their initial length equal with the ratio of their stroke and match the diameters of their cylinders and positions can improve the accuracy of position of the boom; Choose the fit damp in the oil return system can improve the stability and the rapidity of the position of the boom; Decreasing the mass of control valve or the volume of the chamber or the stroke of valve could increase the impact frequency of the hydraulic rock drill. During the period of the extending of the outrigger and the impacting of the hydraulic rock drill, increases the rotate speed of the engine could improve the extending speed of the outrigger jack and the impact frequency and impact velocity.