| 摘要 |
FIELD: mining industry. ^ SUBSTANCE: device has body with blades provided with cutters, central aperture for core catcher and apertures for pumping of drilling mud, placed in inter-blade channels of chisel in body wall between central aperture and outer surface of chisel body. Apertures for pumping of solution are made in radial and/or tangential plane in such a way, that distance between central aperture and apertures for mud pumping at input into chisel body is greater, than at output from chisel body. ^ EFFECT: higher reliability, higher durability, higher efficiency. ^ 6 dwg |
