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外文資料翻譯譯文
（作者未知） 2010/4/14
（接上頁(yè)）ive drilling — the most common method for drilling holes up to 140 mm diameter — hammers the rock with impacts transferred from the rock drill to a drill bit in the bottom or a hole. Hydraulic pressure generates the force required — pressure builds to a maximum and when released, drives an impact piston forward. When the piston strikes a chuck, it transfers its kinetic energy as a stress wave through a drill rod to the drill bit, which uses this impact energy to pulverize the rock. Obtaining the highest drilling productivity and economy requires operation of all components in the system to be highly synchronized.
Design criteria
When designing the hydraulic system for a rock drill rig, the operator must be given complete and independent control of the key parameters — percussion pressure, percussion frequency, feed force, and rotation — to achieve optimum drilling efficiency. When all of these parameters are optimized to suit working conditions, the drill bit has full contact with the rock and the shock wave captures maximum kinetic energy to ensure that each impact achieves high productivity.
Although the design of the machine itself accounts for much of the machine’s productivity, achieving maximum productivity to meet cost targets requires a well-engineered hydraulic system with components that can maintain high reliability even in the face of frequent heavy impacts. Furthermore, a precise remote control is needed to achieve the high synchronization necessary for maximum productivity. Remote control also provides higher visibility, controllability, and safety than machine-mounted controls. It also lends itself to data acquisition to monitor operation and aid in improving future design of machines.
Nimco Controls AB, Malmo, Sweden, developed a system to meet these criteria in drill rigs manufactured by KG Mekaniska AB, Karl Gustav, Sweden. The electrohydraulic system integrates the features of Nimco’s Easy- Prog CANbus-based remote-control （未完，下一頁(yè)）
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