Method and arrangement of controlling of percussive drilling...

Details Method and arrangement of controlling of percussive drilling... Method and arrangement of controlling of percussive drilling...

E - Fixed Constructions

21

B

E21B 44/00 (2006.01)

Patent

CA 2463603

The rock drill apparatus (1) comprises a rock drill machine (6) provided with a percussion device (4), a feed device (9) and a tool (7), the tool (7) end comprising a bit (8) for breaking rock. The tool (7) is arranged to transmit impact energy generated by the percussion device (4) as a compression stress wave to the bit. The feed device (9) is arranged to thrust the tool (7) and the bit (8) against the rock to be drilled, whereby on drilling at least part of the compression stress wave generated by the percussion device (4) to the tool (7) reflects from the rock to be drilled back to the tool (7) as tensile stress, and impact energy of the percussion device (4) is adjusted on the basis of the level of tensile stress (.sigma.v) reflecting from the rock.

L'invention concerne un appareil de forage de roches (1), comprenant un perforateur mécanique (6) doté d'un dispositif à percussion (4), un entraîneur automatique (9) et un outil (7), l'extrémité de l'outil (7) possédant un trépan (8) conçu pour casser la roche. L'outil (7) est adapté de façon à transmettre au trépan l'énergie de frappement générée par le dispositif à percussion (4), sous la forme d'une vague de contrainte de compression. L'entraîneur automatique (9) est adapté de manière à projeter l'outil (7) et le trépan (8) contre la roche à forer. Lors du forage, au moins une partie de la vague de contrainte de compression transmise à l'outil (7) par le dispositif de percussion (4) est renvoyée de la roche à forer à l'outil (7), sous la forme d'une contrainte de traction, et l'énergie de frappement produite par le dispositif à percussion (4) est réglée en fonction du degré de la contrainte de traction (.sigma.¿v?) renvoyée par la roche.

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