| abstract |
Tool is drilled through the utility model relates to a kind of core, including core bit, catches core device and inner core tube, and core bit includes outer core pipe and hollow drill bit, and drill bit includes second level blade, is equipped with coolant circuit hole at blade；Catching core device includes annular matrix and multiple claws, and annular matrix is mounted in inner core tube, and claw is arranged on annular matrix, and claw upper end is inwardly collapsed；Outer core pipe bottom is stretched in inner core tube lower end.The utility model designs the mechanical claw that collapses upward and inwardly, and when claw downlink is easily strutted by core, so that core be made to enter in inner canister；When uplink, claw is difficult to be strutted by core, and since core cannot resist the clamping action of biggish pulling force and claw, core is pulled off at claw, and the core of fracture will continue uplink with claw to be maintained in inner cylinder；Coolant circuit hole is set at blade position, coolant liquid can gush out cooling blade by the through-hole, accelerate the cooling velocity of blade, reduce the abrasion of cutter, extend the service life of blade. |