Rock drill operations are classified as top hammer drilling (THD), down-the-hole drilling, or rotary drilling. The rock drill in the THD method consists of a percussion drill rig module and a drill bit. The percussion drill rig module consists of a drifter, feed drive, and auto rod changer. In particular, the drifter generates the impact and rotational force for drilling. The purpose of this study was to analyze the hydraulic circuits of the drifter and to develop an analysis tool for analyzing the impact capability. This study also analyzed the capability of the drifter with regard to the penetration rate and varying kinetic energy, which is dependent on rock stiffness, using the developed analysis tool.
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- A PS :
area of impact piston in supply port
- A P4 :
area of impact piston in forth chamber
- A V3 :
area of shuttle valve in third chamber
- A VSb :
area of shuttle valve in chamber (V Sb )
- A Da :
area of damping piston in first damping chamber
- A Db :
area of damping piston in second damping chamber
- β :
bulk Modulus of the fluid
- c :
- c P :
friction coefficient of impact piston
- c V :
friction coefficient of shuttle valve
- c D :
friction coefficient of damping piston
- e :
eccentricity of spool
- F load :
- F r :
- m P :
mass of impact piston
- m V :
mass of shuttle valve
- m D :
mass of damping piston
- P P4 :
pressure of impact piston in forth chamber
- P PS :
pressure of impact piston in supply port
- P V3 :
pressure of shuttle valve in third chamber
- P VS :
pressure of shuttle valve in supply port
- Q PS :
flow rate from supply port to impact piston
- Q VSa :
flow rate from supply port to shuttle valve
- Q Da :
flow rate from supply port to damping piston
- x D :
displacement of damping piston
- x P :
displacement of impact piston
- x V :
displacement of shuttle valve
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Oh, JY., Lee, GH., Kang, HS. et al. Modeling and performance analysis of rock drill drifters for rock stiffness. Int. J. Precis. Eng. Manuf. 13, 2187–2193 (2012). https://doi.org/10.1007/s12541-012-0290-1
- Damping piston
- Impact piston
- Rock drill drifter
- Rock stiffness
- Shuttle valve
- Top hammer drilling