Method and apparatus for controlling drilling of rock drill

Details Method and apparatus for controlling drilling of rock drill Method and apparatus for controlling drilling of rock drill

E - Fixed Constructions

21

B

E21B 44/06 (2006.01) B25D 9/26 (2006.01)

Patent

CA 2323950

The invention relates to a method for controlling drilling of a rock drill, in which method a pressure sensor (20) measures the pressure in a space situated behind pistons (4a, 4b, 14a, 14b) supporting a shank (2). The pressure value measured is used to monitor a return pulse that is reflected from the rock to the drill bit and further via the drilling apparatus to the pistons (4a, 4b, 14a, 14b), the return pulse making the pistons move backward and thus causing an increase in the pressure in the space behind the pistons (4a, 4b, 14a, 14b). This, in turn, results in a pressure pulse (B) which can be detected by the pressure sensor (20) and which differs from normal pressure variation (A) caused by the impact motion. On the basis of this pressure pulse (B), a control unit (21) adjusts the feed and the impact power of the drilling machine as well as other parameters affecting the drilling. The invention further relates to an apparatus comprising means for implementing the measurement of pressure pulses (B) according to the method.

L'invention concerne un procédé de commande de sondage d'une perforatrice. Dans ce procédé, un capteur de pression (20) mesure la pression dans un espace situé derrière des pistons (4a, 4b, 14a, 14b) supportant une tige (2). On utilise la valeur de pression mesurée pour surveiller une impulsion de retour réfléchie par la roche vers le trépan, puis, à travers l'appareil de forage, vers les pistons (4a, 4b, 14a, 14b). Cette impulsion de retour fait reculer les pistons, augmentant ainsi la pression dans l'espace derrière les pistons (4a, 4b, 14a, 14b), ce qui, à son tour, se traduit par une impulsion de pression (B) pouvant être détectée par le capteur de pression (20), et différant de la variation de pression normale (A) causée par le mouvement de percussion. Une unité de commande (21) utilise l'impulsion de pression (B) pour régler l'alimentation et la puissance de percussion de la machine de forage, ainsi que d'autres paramètres ayant un effet sur le forage. L'invention concerne également un appareil comportant des moyens pour mettre en oeuvre la mesure des impulsions de pression (B) selon ce procédé.

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