Arrangement for controlling boom for rock drilling unit

Details Arrangement for controlling boom for rock drilling unit Arrangement for controlling boom for rock drilling unit

E - Fixed Constructions

21

B

E21B 15/00 (2006.01) E21B 7/02 (2006.01) E21B 15/04 (2006.01) E21B 41/00 (2006.01)

Patent

CA 2198235

An arrangement for limiting the swing angle of a boom (1) for a rock drilling unit when the boom (1) is being lifted and lowered. In the arrangement, a control member (12) is coupled to the boom (1), turning therewith, said member comprising a slot (13) having a movable dowel pin (14). The dowel pin (14) is coupled to control a relief valve (16) so that when the boom (1) is being lifted or lowered, and when it tends to rum outside the widest permissible swing angle, the control member controls the relief valve (16) so that it lets hydraulic fluid into the swing cylinder (4) for turning the boom to a reverse direction.

Mécanisme destiné à limiter l'angle de pivotement d'un bras (1) d'une perforatrice de roches lorsque ledit bras (1) est levé ou abaissé. Dans ce mécanisme, un élément de commande (12) est couplé au bras (1), tournant avec ce dernier, ledit élément comprenant une fente (13) dotée d'un goujon mobile (14). Le goujon (14) est couplé de manière à commander une soupape de sûreté (16) si bien que, lorsque le bras est levé ou abaissé et qu'il a tendance à tourner au-delà de l'angle de rotation maximal permissible, l'élément de commande actionne la soupape de sûreté afin que cette dernière laisse entrer du fluide hydraulique dans le vérin de pivotement (4) pour faire pivoter le bras dans la direction inverse.

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