Numerical investigation of performance of hydraulic percussion drifter

Oh, Joo-Young; Song, Chang-Heon; Kim, Dae-ji; Kim, Jeonggil; Park, Jin‐Young; Cho, Jung-Woo

doi:10.1007/s12541-016-0107-8

Cited by 16 publications

(4 citation statements)

References 14 publications

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“…Different travel gears were analyzed, and it can be seen that the energy utilization rates in the short piston tests were above 53%, with the maximum value being 56.92%. According to the comparative literature, the hydraulic rock drill designed by Joo Young [23,24], with high pressure (210 bar) and large flow (120 L/min) parameters, obtained a sufficient drilling efficiency and impact force. Nygrena [15,16] concluded that the ideal energy utilization efficiency is close to 60% under very good drilling conditions, but could fall to less than 40% under poor drilling conditions.…”

Section: Energy Utilization Ratementioning

confidence: 99%

“…They investigated the effect of turbulence velocity fluctuations on impactor performance by comparing the ratios between the simulated and experimental impactor efficiencies. Joo Young et al [23,24] studied the hydraulic circuit and impact processes of a hydraulic rock drill, as well as the dynamic effect of rock hardness on impact performance. They found that the energy utilization rate of the rock drill decreased with an increase in hardness.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Piston Mass and Working Pressure on the Impact Performance of a Hydraulic Rock Drill Using the Stress Wave Method

Yang,

Li,

2023

Machines

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To optimize and improve the impact performance of a hydraulic rock drill, it is helpful to test the stress waves of the drill and analyze the impact energy, impact frequency, and energy utilization rate. For this study, a stress wave test bench was designed and built, according to international standards, in order to study the impact process of a hydraulic rock drill under the working pressures of 18 MPa and 23 MPa. The impact energy, impact frequency, and energy utilization rate of two different hydraulic rock drill pistons in low, middle, and high gear were analyzed using a control variable method. The results demonstrate that the impact stress waves of the rock drill periodically occur in the drill rod, and then decay exponentially until they become close to zero. Moreover, the amplitude of the incident stress wave determines the rock-breaking ability of the drill. The impact energy of the short piston is greater than that of the long piston, with a maximum average value of 346.1 J; the impact frequency of the long piston is higher than that of the short piston, with a maximum average value of 62 Hz; and the energy utilization rate of the short piston is higher than that of the long piston, with a maximum average value of 56.92%, which is close to the theoretical ideal efficiency. Therefore, it can be concluded that the impact performance of a hydraulic rock drill can be effectively tested using the proposed horizontal bench, and that piston characteristics and the working pressure are the main factors affecting impact performance. Accordingly, when developing a hydraulic rock drill, it is advisable to select a shorter piston and a higher working pressure, thus allowing the drill to provide good impact performance.

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Section: Energy Utilization Ratementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Piston Mass and Working Pressure on the Impact Performance of a Hydraulic Rock Drill Using the Stress Wave Method

Yang,

Li,

2023

Machines

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“…In recent years, hydraulic rock drills have been widely used in many applications, such as mining, coal mine roadway excavation, railway tunnel, highway tunnel, and rock excavation projects because of their high efficiency, clean, and safety. 1,2 The hydraulic rock drill with high frequency and high power becomes the first choice facing the scale of mining and larger-scale tunneling. 3,4 Different from the DTH (down-the-hole) hammers, [5][6][7] the hydraulic rock drill is driven by hydraulic system and belongs to top hammer drilling.…”

Section: Introductionmentioning

confidence: 99%

Percussion characteristic analysis for hydraulic rock drill with no constant-pressurized chamber through numerical simulation and experiment

Geng

Jia

et al. 2019

Advances in Mechanical Engineering

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Considering the insufficiency of numerical study on the percussion characteristic of hydraulic rock drill, which restricts the improvement of efficiency and reliability, a coupling model including the impact piston, spool valve, impact accumulator, and connecting pipelines was established taking into account the oil compressibility, oil leakage, and pressure drop in valve ports. The rebound velocity of impact piston was calculated based on the stress wave theory. The simulation results revealed the coupling mechanism of percussion system. Pressure curves of the piston's front-chamber and rearchamber, and valve's left-chamber and right-chamber were obtained by field rock drilling test. Then, the velocity curve of impact piston was obtained after judging the striking point through the feature of rear-chamber's pressure spike, so were the rock drill's impact energy, impact frequency, and impact power. The simulation and experimental results have consistency. And, on this basis, the influence of spool valve's damping clearance (d) and pipeline diameters (d 1 , d 2) connecting the impact piston and spool valve on the percussion performance and system cavitation was researched. The results show that the larger d is better considering reversal time of spool valve, the impact frequency of rock drill, pressure fluctuation, and cavitation relief. But too large d will cause over quick impact velocity of the spool valve, which may lead to strong vibration and the damage of spool valve. The optimal value of d is 0.01 mm by comprehensive consideration. The pipeline diameters have an important influence on the pressure fluctuation and negative pressure in rear-chamber. The diameters should be larger than 18 mm to alleviate the cavitation. This article provides means for the design and research of rock drills.

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“…In recent years, the hydraulic surface drilling rigs are widely used in surface mining, quarries, and construction [1][2][3]. However, the drilling rigs are working with low energy efficiency (i.e., consume excessive energy).…”

Section: Introductionmentioning

confidence: 99%

Control strategy of energy saving for power system in hydraulic surface drilling rig

Liang

Wanrong

2018

J Braz. Soc. Mech. Sci. Eng.

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In order to achieve the purposes of better energy saving and lower fuel consumption under the condition in which load changes frequently and fluctuates dramatically, the energy-saving control strategy of power system is put forward in a hydraulic surface drilling rig. The structure of power system and working conditions of hydraulic surface drilling rigs are described. The mathematical models of the external characteristic for engine, variable pump, and air screw compressor in hydraulic surface drilling rig are presented in detail. Then the control strategy of power system and the fuzzy PID control algorithm to implement this strategy are proposed to control the engine speed in various working states. The simulation analysis and experimental investigation are carried out to study the fuel consumption in the typical operating conditions by using energy-saving control strategy. Results show that the energy-saving control strategy can reduce fuel consumption for the hydraulic surface drilling rig while ensuring that the system performance is not sacrificed.

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Numerical investigation of performance of hydraulic percussion drifter

Cited by 16 publications

References 14 publications

Influence of Piston Mass and Working Pressure on the Impact Performance of a Hydraulic Rock Drill Using the Stress Wave Method

Influence of Piston Mass and Working Pressure on the Impact Performance of a Hydraulic Rock Drill Using the Stress Wave Method

Percussion characteristic analysis for hydraulic rock drill with no constant-pressurized chamber through numerical simulation and experiment

Control strategy of energy saving for power system in hydraulic surface drilling rig

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