DEVICE FOR ASSEMBLY OF CONE CUTTER BIT SECTIONS Russian patent published in 2008 - IPC E21B10/00 

FIELD: mining.

SUBSTANCE: invention concerns drilling equipment and can be applied in cone cutter bits assembly. The device for assembly of cone cutter bit sections includes pivot housing with plate and supports for section orientation and fixation, template ring for ensuring necessary cutter bit diametre. On the plate there are basic mounting pins equidistanced from each other. Assembled sections have mounting holes on the ends, matching the basic mounting pins, and are mounted with minimum positive allowance by dihedrals. The case bears moving cams with sprung thrusters and rigid struts with replaceable template ring mounted on them and having internal diametre equal to the assembled cutter bit diametre. Minimum positive allowance δ is arranged between the dihedral planes of assembled sections to enable each section thruster turning around the basic mounting pin axis till reverse cutter cones contact internal surface of the template ring. Axes of all basic mounting pins at the section ends are positioned at planes passing over dihedral axes at equal acute angles β if seew from entering side, while axes of shearing thrusters are positioned at acute angles γ to leaving sides. Axes of internal mounting surfaces of rigid struts, intermediary ring and gage ring coincide with the central device axis. Cams shifting cutter bit sections during assembly are equipped with adjustable spring thrusters allowing compensation of difference in radial foot forging sizes of cone cutter bit at the points of their contact to the cutter bit feet.

EFFECT: fast and more accurate cutter bit assembly.

5 cl, 9 dwg