The impact energy, which is the main performance index of a rock drill, was estimated by many researchers in an indirect way because of the difficulty of direct measurements.
Those measurement methods are difficult to apply to the performance tests of mass-produced drills as they require modification of the structure of percussion drills or preparation of standardized rock samples.
In view of these practical requirements, Han Tok Hyong, an institute head at the Faculty of Mining Engineering, proposed a new structure of impact energy measurement device and analyzed its performance and availability through simulation.
The analysis results show that the stress wave transmitted through the drill rod is converted into the pressure wave of oil filled inside the cylinder. Its maximum value is 15-28MPa, varying with position. Therefore, a suitable location of the measurement point can raise measurement accuracy while extending the service life of the sensor.
The proposed device can be used effectively in the field of impact energy measurement of rock drills due to its simple structure and high reliability. Especially, as it is possible to estimate impact energy without altering the structure of rock drills, it can be used in performance testing processes in rock drill plants.
For more information, please refer to his paper “Simulation Study of Hydraulic Measuring Device for Impact Energy Estimation in Performance Test of Rock Drill” in “Proceedings of KUTIC-2025”.