Серия SMD Трехшарошечное рок немного

Turbo drills are widely used in Russia and this requires the bit be suitable for high RPM. Rotary speed of the turbo drills normally used with 11 5/8 and 8 1/2 inch bits can be 400 to 600rpm and working life of conventional roller cone bits is only about 10 hours when used with such turbo drills. Aiming at the high speed drilling condition, Kingdream developed th new Roller-journal Composite Bearing for roller cone bit in combination with metal-face seal, which largely improved the reliability and working life of the bit when used in such ultra high RPM conditions. In addition, corresponding cutting structures and extended dual nozzle hydraulic system for high RPM drilling are also designed. When used in Russia, the bit drilled steadily on turbo drill for more than 30 hours with the rotary speed above 400 RPM. SMD series bit features longer working life, higher reliability and higher ROP when used under ultra-high RPM conditions. In order to be more economical, it is recommended that the SMD bits be used within the range of 250 to 600 RPM.