Drilling apparatus

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 4/14 (2006.01) E21B 6/00 (2006.01)

Patent

CA 2208893

A drilling device operates as a down-the-hole drill by a feeding motion along its longitudinal direction, a to-and-fro hammering motion and a rotational motion around its longitudinal axis. The drilling apparatus includes hammering means, driven by pressure medium in liquid form led by a second flow arrangement from the pressure medium system of the drilling apparatus. The hammering means include a hollow frame part, a valve and flow directing arrangement controlling the flow of pressure medium for the hammering means, a piston arrangement carrying out the hammering motion by influence of the above and an accumulator arrangement for storing pressure medium. To minimize the cross section of the hammering means, a flow way of the second flow arrangement in connection with the piston arrangement, such as an input flow way and/or output flow way, is divided into two or more flow parts.

L'invention concerne un appareil de forage (1) qui progresse dans le trou de forage par un mouvement d'avancement dans le sens longitudinal (s), un mouvement de martelage en va-et-vient (t) et un mouvement de rotation (w) autour de l'axe longitudinal (s) du dispositif. L'appareil de forage en question comprend un système de martelage (8), dont le principe fonctionnel est celui d'une pressurisation hydraulique obtenue par un deuxième écoulement (9) du système de pressurisation de l'appareil proprement dit. Le système de martelage (8) est équipé d'un châssis creux (7), d'une valve et d'un dispositif d'écoulement (o) qui permet de contrôler le débit du liquide de pressurisation dans la structure, un piston (10) produisant le martelage sous l'effet de la pression et un accumulateur (11) permettant de stocker le liquide de pressurisation. Afin de réduire au minimum la section transversale du système de martelage (8), on divise en deux ou en plus de deux passages le deuxième écoulement (9) fonctionnant en liaison avec le piston (10), dans une configuration à voie d'admission (9a) et/ou voie d'évacuation (9b).

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