FACILITY FOR WELL DRILLING (VERSIONS) Russian patent published in 2009 - IPC E21B10/00 

FIELD: mining.

SUBSTANCE: invention refers to facilities for well drilling mainly in hard rocks with implementation of cone bits. The facility incorporates cone bit with support, bottom drill tube, support unloading unit in form of a flushing plate with circular collar creating friction pairs together with back tampered cones of cone bits, also the facility incorporates a unit of forced circulation running of cone bits. This unit is installed inside the bottom drill tube and made in form of an axial turbine the shaft of which is connected with the flushing plate. The support of the cone bit includes a locking element and a rolling bearing. The rolling bearing is formed with rollers of different diameters. Bearing bodies of smaller diameters are equipped with a rubber coat the exterior diameter of which corresponds to the exterior diameter of bearing bodies of bigger diameter. The locking element consists of spring loaded pins arranged in radial channels cut in a journal. Free ends of pins are of spherical shape and are located in a circular groove cut on the interior surface of the cone bit. Rollers with rubber coat and hollow rollers are arranged alternately with other rollers next nearest.

EFFECT: increased efficiency of cone bit operation.

4 cl, 7 dwg