Grip valve control system for a rock drill

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 19/08 (2006.01) E21B 19/086 (2006.01) E21B 19/087 (2006.01)

Patent

CA 2333300

The invention relates to a rock drill air leg control system incorporated in the backhead (10) of a rock drill. The system comprises a single spool valve (22) having two manual controls (46, 53), one for setting a thrust applied by an air leg to a rock drill and the other for retracting the air leg without affecting the thrust setting achieved by operation of the first control. The first manual control is in the form of a twist-grip control (53) which is arranged to set the axial position of a spring-biased valve spool (30) in the valve (22) via a pin (50) and a plunger (46). The plunger (46) also forms the second of the manual controls and can be pressed against the spring-biased valve spool (30) to vary the axial position of this spool.

La présente invention concerne un système de commande pour pousseur pneumatique de trépan à roches intégré dans la culasse arrière (10) du trépan. Le système comprend un distributeur unique à tiroir (22) muni de deux commandes manuelles (46, 53) qui servent l'une à régler la poussée appliquée par un pousseur pneumatique sur le trépan, l'autre à rappeler le pousseur pneumatique sans altérer le réglage de poussée donné par la première commande. Cette première commande manuelle se présente sous la forme d'une poignée rotative (53) permettant de régler la position axiale d'un tiroir (30) sous charge de ressort dans le distributeur (22) par l'intermédiaire d'un doigt (50) et d'un plongeur (46). Ce plongeur (46) constitue également la seconde commande manuelle et peut poussé contre le tiroir sous charge de ressort (30), ce qui a pour effet de modifier la position axiale dudit tiroir.

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