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What are the types of drill teeth for rotary drilling rigs?

2023-03-23 15:39

The torque and axial pressure output by the rotary drilling rig are all condensed on the tip of the drill tooth, cutting or crushing. The type selection and quality of drilling teeth determine the drilling load and construction efficiency. Select drill teeth according to geological type and strength. The commonly used drill teeth can be divided into three types: bucket teeth, pick teeth, and cone drills.
1. Bucket teeth
Bucket teeth are a typical cutting and drilling method. Linear cutters are used to achieve drilling through cutting plastic loose geology with the tooth edge. Generally, the width of the tooth tip is between 54mm and 87mm, and the lower the geological strength, the deeper the tooth tip cuts into the stratum. Selecting a wide and long tooth body can increase the cutting flow and prevent the support bottom; As the geological strength increases, the depth of the tooth tip cutting into the geological surface becomes shallower, and the length of the tooth body can also be reduced to eliminate the problem of supporting the bottom. Moreover, the strength of the tooth body can be enhanced. Reducing the width of the tooth body can reduce cutting resistance and improve cutting ability.
2. Pick
Point type cutter, shearing "crushing" drilling method. Its characteristics: the streamlined conical tooth body has a short tooth length, and the tooth tip is made of hard alloy material that is resistant to wear. The tooth tip has a high ground specific pressure value, and the drill tooth pressure is further enhanced, improving the crushing and rock penetration ability.
3. Roller drill
Point type cutters, carbide drill teeth, through axial pressure and torque, form autorotation, revolution sliding, longitudinal vibration, high-frequency shear crushing or impact crushing rock. Compared to the cutting and crushing method of the pick, the pick is fixed by itself, and the single alloy point always rubs against the rock layer, resulting in greater alloy wear and vibration. The tooth wheel rotates automatically, and the cutting edge of the crushing tooth is long, which alleviates wear and vibration. The rock is crushed through multi-point cemented carbide high-frequency impact.