The development of core drill bit

Core drill bits or needs to be replaced at the end of the center core drill bits, you should clear the hole, the hole bottom residue Chuijin, then stop turning, the center of the arix core drill bit slowly move up move, the size of the lifting force to move the center of the core drill bits just to mention as appropriate, to enhance the height of the eccentric core drill bits back up contact with the front end of the casing shoe; then core drill bits a low speed reverse, while slowly lifting up the test center core drill bits. When the observed center core drill bits can smoothly upgrade, show eccentric core drill bit has collapsed, then the center core drill bits can enhance a conventional manner, until all proposed center core drill bits. When reversing core drill bits, care should be taken to prevent tripping core drill bit.

Sometimes due to excessive residual rock bottom slag hole, eccentric rotary core drill bits is part of rock slag death eccentric core drill bits folded card. When try to mention a few still does not work, should convey compressed air, re-core drill bits for cleaning, and DTH for a short work, and then re-center the core drill bits lifting operations.
DTH core drill bits pipe construction technology is an effective method for overcoming the complex formation core drill bits means difficult, eccentric core drill bits pipe with its unique structure, excellent performance for complex formation to provide core drill bits construction a reliable technical support. Applied to the construction of the electroplated core drill bit pipe with the specifications of the series has also been increasingly improved.