Electrically Controlled Hydraulic Rock Drill
Shah, Kabeer Hussain
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Epiroc Rock Drills AB is a recognized around the world as a leading manufacturer and supplier of mining machinery and tools for surface drilling and underground drilling operations. This thesis work is an investigative study to find the possibilities to use electric valves in current hydraulic rock drills. The primary requirement for this purpose is the modelling of a controller to regulate valve in a percussion mechanism. The controller should control the valve operation and also, piston motion by adjusting the piston stroke length. To model and implement the controller in a percussion mechanism, knowledge of the operation of valves in current rock drills is necessary. The other requirement is the simulation model of an electric valve to work along controller. The master thesis has resulted in a conceptual design of an electrically controlled hydraulic rock drill. The design is based on the percussion mechanism of the rock drill. The functionality of the system has been proven in a simulation model, and possible operational range, efficiency and control strategy has been studied in several analysis. The results of the simulation analysis agree with the specified requirements. Furthermore, these results point out the capability of the controller to operate valve, adjust piston stroke length and percussion pressure and the use of two input signals simultaneously for better control and performance of the percussion mechanism. The recommendation on the basis of this investigative study is to thoroughly investigate the implementation of the controller in a current rock drill. If the system meets the specified requirements, it is recommended then to build the controller in order to further evaluate its capabilities.