FLUID DRIVE TYPE DRILL BEAT ASSEMBLY AND DRILLING MACHINE

摘要

PURPOSE: A fluid drive type drill bit assembly and an excavation apparatus therewith are provided to obtain the rotation power of a drill bit through the pressure of fluid used as coolant and lubricant. CONSTITUTION: A fluid drive type drill bit assembly(50) comprises a rotary body(52) and a drill bit(54). The rotary body is rotatably installed in the end of a drill string(30) through a bearing(53). The rotary body is composed of a rotary nozzle unit(520) and a body unit(522). The rotary nozzle unit is coupled to the end of the drill string and has multiple holes(521a). The body unit is downward extended from the center of the rotary nozzle unit and has two or more blades(524). The drill bit is installed in the lowermost end of the rotary body and has multiple excavation blades.