Rock drilling device with recoil damper
AssigneeAtlas Copco Rocktech AB
InventorsChrister Jonsson, Jorgen Jonasson
Life of this patent
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Abstract
Rock drilling device for drilling with a drill string comprising a set of tubes (1) and a set of rods (2) arranged centrally in the set of tubes. The rock drilling device comprises conduit (22) for sensing a liquid pressure in a recoil damper (21) and actuating valves (23,24) for stopping the supply of pressure liquid to a hammer device (25) of the rock drilling device when the pressure in the recoil damper (21) falls below a predetermined value in order to prevent that the drilling tool and/or the machine housing is damaged at a to low damper pressure
Claims3
Rock drilling device comprising a machine housing (3), a hammer piston (4) movable to-and-fro in the machine housing, a drill string comprising a set of tubes (1) for transferring rotation to a drill bit and a set of rods (2) arranged centrally in the set of tubes for transferring impact energy from said hammer piston to said drill bit, and a recoil damper (21) arranged in the machine housing for damping recoils from said set of rods, characterized by means (22) for sensing a liquid pressure in said recoil damper (21) and actuating means (23,24) for stopping the supply of pressure liquid to a hammer device in the rock drilling device when the pressure in the recoil damper (21) falls below a predetermined value.
Dependencies are inferred from the claim text.