Internally dampened percussion rock drill

Details Internally dampened percussion rock drill Internally dampened percussion rock drill

E - Fixed Constructions

21

B

E21B 4/14 (2006.01) B23B 47/00 (2006.01) B25D 9/00 (2006.01)

Patent

CA 2716775

A percussion drill, and methods of using the same, including a shank in mechanical alignment with a piston- hammer and a valve in fluid communication with the piston- hammer. The percussion drill further includes an internal hydraulic dampening system for reducing the velocity of the piston-hammer when the shank is forward of a power position relative to the velocity of the piston-hammer when the shank is in a power position. Preferably, the internal hydraulic dampening system includes mechanical alignment of a portion of the piston-hammer with a port in fluid communication with the valve, operable to reduce fluid flow into an area surrounding the valve when the piston-hammer is forward of its position relative to its normal operation.

La présente invention concerne un perforateur mécanique et des procédés pour son utilisation, comprenant un emmanchement intérieur en alignement mécanique avec un piston-marteau et une soupape en communication fluidique avec le piston-marteau. Le perforateur mécanique comprend en outre un système damortissement hydraulique interne pour réduire la vitesse du piston-marteau lorsque lemmanchement se trouve dans une position motrice. De préférence, le système damortissement hydraulique interne comprend un alignement mécanique dune partie du piston-marteau avec un orifice en communication fluidique avec la soupape, pouvant être actionné pour réduire lécoulement de fluide dans une région entourant la soupape lorsque le piston-marteau est avant de sa position par rapport à son fonctionnement normal.

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