A pulse generating device and a rock drilling rig comprising...

B - Operations – Transporting – 25 – D

Patent

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Details

B25D 9/22 (2006.01) B25D 17/24 (2006.01) E21B 44/06 (2006.01)

Patent

CA 2704173

The present invention relates to a pulse generating device for inducing a shock wave in a tool, wherein the said pulse generating device comprises an impact means (201, 301) for transferring energy to a drill string (202) connected to the said tool, and wherein the energy transfer gives rise to the said shock wave, in which the said energy is mainly constituted by elastic energy stored in the impact means (201, 301) and/or an energy store. The device comprises control means for controlling the interaction of the impact means (201, 301) with the drill string (202), wherein the said control means for controlling the interaction of the impact means (201, 301) with the drill string (202) comprises a motor (207, 307), and wherein the said motor (207, 307) is designed to, through rotation, alternately open ducts for pressurization and depressurization of at least one drive surface (205) acting upon the said impact means. The invention is characterized in that the rotation axis of the said motor (207, 307) is arranged substantially coaxially with the drill string (202).

La présente invention se rapporte à un dispositif de génération d'impulsions destiné à provoquer une onde de choc dans un outil. Ledit dispositif de génération d'impulsions comprend des moyens de percussion (201 ; 301) destinés à transférer l'énergie vers un train de tiges de forage (202) raccordé audit outil. Le transfert d'énergie donne lieu à ladite onde de choc, dans laquelle ladite énergie est principalement constituée par l'énergie élastique stockée dans les moyens de percussion (201 ; 301) et/ou un réservoir d'énergie. Le dispositif comprend des moyens de commande destinés à commander l'interaction des moyens de percussion (201 ; 301) avec le train de tiges de forage (202). Lesdits moyens de commande destinés à commander l'interaction des moyens de percussion (201 ; 301) avec le train de tiges de forage (202) comprennent un moteur (207 ; 307), ledit moteur (207 ; 307) étant conçu pour, par rotation, ouvrir en alternance des conduits destinés à la mise sous pression et à la décompression d'au moins une surface d'entraînement (205) agissant sur lesdits moyens de percussion. L'invention se caractérise en ce que l'axe de rotation dudit moteur (207 ; 307) est placé de manière sensiblement coaxiale avec le train de tiges de forage (202).

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