Description:

When the cone bit working, the cone will rotate, and the teeth contact with the well bottom by turns, which can break up the rock by shocking, squeezing and the sliding shearing. The torque for breaking the rock is small. The contacting size between the teeth of the cone and the well bottom is small, the specific pressure is high, for which it is easy to enter the stratum. The sum length of the working cutting is large, which reduces the wear relatively. These characteristics make the cone bit can be applicable to various ground ranges form soft to hard. The application range: the tri-cone bit is a kind of drill head which is used most widely in the oil rig. It has more advantages, it breaks up the rock by shocking, squeezing and the sliding shearing. The resistance in breaking the rock is small, the contacting size between the teeth of the cone and the well bottom is small, the specific pressure is high, for which it is easy to enter the stratum. The sum length of the working cutting is large, the wear is small. So it is used widely in various stratum range from soft to hard. The working principle: (1) the revolution and rotation of the cone (2) the vertical vibration of the drill head and the shaking and squeezing to the stratum (3) the shearing of the teeth to the stratum (4) the self-washing of the cone bit.