In the oil drilling industryand all kinds of cone bits, it is an important and indispensable part of rollerbit, but for some of drilling industry, the price is too high, which has ledsome drilling industry had a great interest in the secondary cone bit. Itsprice is low and quality is reliable (in petroleum drilling using only the lifeof 1/3) , reduces a lot of cost for drilling industry. So the second hand ofcone bit has become an important part for some drilling industry.
The most widely used one inoil drilling and geological drilling is cone bit. Cone bit is of impact, crushing and shearing crushing rock role in rotation, so cone bit can adapt tovarious strata of soft, medium and hard. Especially after the appearance of jettype roller bit and rock bit cone bit nozzle, the drilling speed is greatlyimproved, which is a great revolution in the history of the development of conebit. Cone bit by tooth type can be divided into milling (steel teeth) teethroller bit. (rock inlaid on the hard alloy tooth roller cone bit; according tothe cone number) can be divided into single, double cone roller, roller and athree roller bit. At present, at home and abroad, the most common and most usedone is three cone bit.