E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 21/08 (2006.01) E21B 10/18 (2006.01) E21B 21/16 (2006.01) E21B 44/00 (2006.01)
Patent
CA 2258783
In connection with rock drilling it is necessary to control the airflow through the drill bit in question. The pressure of the flushing air is measured in a reference area in order to mathematically calculate nominal and corrected airflow values through the drill bit with the aid of said pressure. According to the invention, existing nozzles (8) and/or channels (11) in the drill bit are utilised as a reference area for pressure measurement, and the real pressure is measured with the aid of a measurement means (14) which comprises a narrow tube (15) communicating with a manometer, which tube with an orifice is inserted into one nozzle (8) of the drill bit.
Pour le forage de la roche, il convient de réguler le flux d'air à travers le fleuret à rocher en question. La pression de l'air d'évacuation est mesurée dans une zone de référence afin de calculer mathématiquement des valeurs d'écoulement d'air nominales et corrigées à travers le foret à rocher à l'aide de ladite pression. Selon l'invention, des buses (8) et/ou des canaux (11) existant dans le fleuret à rocher sont utilisés en tant que zones de références pour la mesure de la pression, et la pression réelle est mesurée à l'aide d'un moyen de mesure (14) comprenant un tube étroit (15) communiquant avec un manomètre, lequel tube doté d'un orifice est inséré à l'intérieur d'une buse (8) du fleuret à rocher.
Gowling Lafleur Henderson Llp
Sandvik Ab
LandOfFree
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