Percussion device and rock drilling machine including such a...

B - Operations – Transporting – 25 – D

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Details

B25D 9/26 (2006.01) E21B 1/26 (2006.01) B25D 9/14 (2006.01)

Patent

CA 2640533

A percussion device having, inside a machine housing (7), a movable percussive piston (2), the movement of which being controllable through a movable valve body (5), which is arranged to, in dependence of a signal indicating the axial position of the percussive piston, alternately to a pressure source and to a low pressure connect a chamber, in which a driving surface on the piston (2) is located, whereby control channel means ( 10, 12; 10', 12' ) for transmitting said signal have opening means opening into a cylinder space for receiving the piston (2) for co-operation with a control edge (11,13) on the piston. Adjustment means are arranged for making possible an adjustment of which axial position of the piston said signal is transmitted. The adjustment means includes at least one axially displaceable control means (9, 9', 9'' ), which contacts the piston, and which includes a portion ( 10, 12; 10', 12 ' ) of the control channel means including the opening means. The invention also concerns a rock drilling machine and a method.

L'invention porte sur un dispositif à percussion comportant, à l'intérieur du corps (7) de la machine, un piston à percussion mobile (2) dont le déplacement peut être commandé par un corps de soupape mobile (5) qui est agencé, en fonction d'un signal indiquant la position axiale du piston à percussion, alternativement par rapport à une source de pression et à une basse pression, de façon à se raccorder une chambre dans laquelle une surface d'entraînement est formée sur le piston (2). Des canaux de commande ( 10, 12; 10', 12'), prévus pour transmettre ce signal, comportent un dispositif d'ouverture donnant dans un espace cylindrique de façon à recevoir le piston (2) afin que celui-ci coopère avec un bord de commande (11, 13) du piston. Un dispositif de réglage est disposé pour pouvoir effectuer un réglage de la position axiale du piston où le signal est transmis. Le dispositif de réglage comprend au moins un élément de commande à déplacement axial (9, 9', 9'') qui vient en contact avec le piston et qui comprend une partie ( 10, 12; 10', 12 ') du canal de commande comprenant le dispositif d'ouverture. Cette invention porte également sur une perforatrice de roches et sur un procédé correspondant.

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