Drill rod centering device

Details Drill rod centering device Drill rod centering device

E - Fixed Constructions

21

B

255/23

E21B 17/10 (2006.01)

Patent

CA 1130780

ABSTRACT The invention is concerned with a drill rod centering device including a housing connected with a ro- tating mechanism actuated by a hydraulic drive. The center- ing device of the invention is characterized in that it has at least three link gears with roller bearings. The roller bearings are uniformly circumferentially spaced within the housing and mounted each on a vertical spindle for radial displacement by the action of the hydraulic drive by means of the rotating mechanism and the link gears. The roller bearings have their external side surfaces permanently urged against the drill rod to define the centering diameter. The centering device is also provided with hydraulic valves underlying the roller bearings. The roller bearings are spring-urged along their axes and are mounted for axial dis- placement so that upon a certain friction value developing between the rod and the roller bearings, the roller bearings travel jointly with the rod in the direction of drill to engage the hydraulic valves, whereby the valves exert a force setting the centering diameter to correspond with the drill rod diameter.

346019

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