Compact sandstone oil surveys uses drill bit fixing device

Compact sandstone oil surveys uses drill bit fixing device, including drill bit, connecting thread cover etc. The drill bit middle part has the external screw thread shaft part, external screw thread shaft part and thread bush internal thread hole threaded connection, the transmission shaft lower part has transmission shaft external screw thread shaft part, transmission shaft external screw thread shaft part and thread bush internal thread hole threaded connection, transmission shaft inside has the inner prop hole, the drill bit top has a cylinder plush copper, during the inner prop hole is inserted to the cylinder plush copper, drill bit middle part evenly distributed parallel key, drill bit middle part evenly distributed triangle key, the transmission shaft is inside to have a key -type connection groove, during parallel key, triangle key insert the key -type connection groove, thread buckling intra -annular portion has buckle internal thread hole no. One in one number, thread buckling intra -annular portio