Types of Rotary Drilling Rigs Drill Teeth

Rotary drilling rigs are comprehensive drilling rigs that can be used for dry excavation work with short auger bits or for wet excavation work with rotary bits in the presence of a mud guard arm. The rotary drilling rig can be used in conjunction with a punch to break up hard ground and then excavate the hole. The output torque and shaft pressure of the rotary drilling rig are coalesced on the tips of the drill teeth, which cut or break. The selection and quality of the teeth determines the drilling load and the efficiency of the work. Drilling teeth are selected according to the type and strength of the geology. Commonly used drilling teeth can be divided into three main types: bucket teeth, cut-off teeth and tooth wheel drills, etc.

1. Bucket teeth

The bucket tooth is a typical cutting drilling method, a linear tool, which cuts plastic loose geology through the tooth edge to achieve drilling. The lower the geological strength, the deeper the tip of the tooth is cut into the stratum, the wider and longer the tooth body can be installed to increase the cutting flow and prevent bottoming; and as the geological strength rises, the tip of the tooth is cut into the geological depth becomes shallow, eliminating the problem of bottoming.

2. Rotary cut-off teeth

The rotary cut-off is a point tool that shears the "broken" drilling method. They are characterised by a streamlined tapered tooth body with a short tooth length, a hot isostatically pressed carbide tip that is resistant to wear and tear, and a high tip ground pressure value, which further increases the pressure of the drill tooth and enhances the crushing capacity into the rock.

3. Rotary pallet

The rotary cutter is a point tool in which the carbide teeth are used to break the rock through axial pressure and torque, creating a high frequency of shearing and crushing or impact crushing. Compared to rotary cut-off teeth, the shearing and crushing method is different. The cut-off teeth are fixed by themselves and a single alloy point always rubs against the rock, which results in greater alloy wear and vibration, while rotary palm blades rotate and have a long crushing tooth edge, which relieves wear and vibration and breaks the rock by multi-point carbide impact crushing at a high frequency.