Drill rod handler
A drill rod handler provides rods to be used to form a drill string in on-shore drilling operations. The drill rod handler includes side arms which are moveable to encourage drill rods to roll towards or away from a center line of the drill rod handler. A working arm is arranged to grasp a centrally located drill rod, and to raise it from a horizontal to a vertical configuration. The working arm may then slew to correctly position the drill rod at the correct location for use.
1. A grabbing arm for use in movement and manipulation of an elongate member, the grabbing arm being generally elongate, wherein said grabbing arm comprises:
a first grabber and a second grabber, each of said first and second grabbers spaced apart from each other in an elongate direction and configured to engage with said elongate member for movement and manipulation of said elongate member, wherein each of said first and second grabbers include:
a primary grasper and a secondary grasper that are each independently moveable between an open configuration and a closed configuration, said primary grasper having a first effective circumference in the closed configuration, and said secondary grasper having a second effective circumference in the closed configuration, wherein each of the primary and secondary graspers includes a set of jaws operated by a linking structure,
wherein the first effective circumference of the primary grasper is substantially the same as the circumference of said elongate member, and the second effective circumference of the second grasper is larger than the first effective circumference, and
wherein the primary grasper of the first grabber is spaced apart in the elongate direction from the primary grasper of the second grabber, and the secondary grasper of the first grabber is spaced apart in the elongate direction from the secondary grasper of the second grabber,
wherein each first and second grabber is moveable between (i) an open position in which both respective primary and secondary graspers are in their open configuration and (ii) a closed position in which both respective primary and secondary graspers are in their closed configuration, said primary grasper of each of the first and second grabbers being sized to grasp and hold the elongate member in the closed configuration and the secondary grasper of each of the first and second grabbers being sized to be at least partially spaced from the elongate member in the closed configuration.
2. A grabbing arm as claimed in claim 1 , wherein the linking structure is arranged such that the operation of an operating cylinder causes opening and closing of the jaws.
3. A grabbing arm as claimed in claim 2 , wherein the operating cylinder is arranged to operate radially relative to the area bounded by the jaws.
4. A grabbing arm as claimed in claim 1 , wherein the grabbing arm has a moveable foot.
5. A grabbing arm as claimed in claim 4 , wherein the moveable foot is arranged to move in an elongate direction.
6. A grabbing arm as claimed in claim 1 , wherein the grabbing arm includes a detection means to indicate whether the elongate member is in a position to be grasped by the first and second grabbers.