Method and arrangement in rock drilling rig

Details Method and arrangement in rock drilling rig Method and arrangement in rock drilling rig

B - Operations, Transporting

25

D

B25D 9/26 (2006.01) E21B 44/00 (2006.01)

Patent

CA 2735772

A rock drilling rig (1) is provided with a rock drilling machine (6) comprising an impact device (4), a feed device (9) and a tool (7) with a drill bit (8) at the end thereof for breaking rock. The impact device is arranged to cause a stress wave to the tool and from there further to the rock to be drilled. During drilling at least some of the compressive stress wave (.sigma.i) caused to the tool is reflected as a stress wave (.sigma.r) from the rock back to the tool. The method comprises determining a momentum (P r) of the stress wave (.sigma.r) reflected from the rock to the tool and adjusting the operation of the impact device and/or that of the feed device on the basis of the momentum.

L'invention concerne une installation de forage de roche (1) équipée d'une machine de forage de roche (6) comprenant un dispositif d'impact (4), un dispositif d'alimentation (9) et un outil (7) pourvu d'un trépan de forage (8) à l'extrémité de celui-ci pour casser la roche. Le dispositif d'impact est conçu de manière à appliquer une onde de contrainte à l'outil et à partir de celui-ci à la roche à forer. Pendant le forage, au moins une partie de l'onde de contrainte de compression (si) appliquée à l'outil est renvoyée sous la forme d'une onde de contrainte (sr) de la roche à l'outil. Le procédé comprend la détermination d'une quantité de mouvement (Pr) de l'onde de contrainte (sr) qui est renvoyée de la roche à l'outil et le réglage du fonctionnement du dispositif d'impact et/ou de celui du dispositif d'alimentation sur la base de la quantité de mouvement.

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