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Because the cutting action is produced primarily by rotational torque, it is also referred to as rotary cut drilling. 2.3 Principle of rolling and drilling The rolling principle is applicable to the drilling of rocks below medium hardness. The roller drill applies the rolling principle to the drilling. The drilling process of the roller bit is shown in Figure 4. The drill is connected to the roller cone bit through the drill rod, and the drill rod is used to pressurize the bit into contact with the rock. At the same time, under the rotating action of the drill pipe, the cone with column teeth on the drill bit rolls, and through the column teeth in contact with the rock,down the hole bit, the vibration impact and press-in force are transmitted to break the rock. This kind of drilling method is a combination of vibration impact crushing action and shear crushing action, so it is called rolling drilling, because the cone rolls on the rock, it can also be called rolling drilling. Coal mine roadheaders and tunnel boring machines all use the principle of rolling and crushing rocks. 2.4 Vibrating drilling principle The principle of vibration drilling is shown in Figure 5. Vibration drilling is applicable to drilling in soil or soft rock. The equipment for vibration drilling includes sonic drill, ultrasonic rock drill, etc. 2.5 Combined action of multiple principles Percussive, cutting, rolling, and vibrating methods are the four basic ways to drill holes in rock or soil. Actual drilling equipment is generally a combination of several principles. For example, hydraulic rock drill drilling is mainly based on impact action, supplemented by cutting action. Sonic drilling is based on the principle of vibration and the combined action of vibration, rotary cutting and rolling. 03. Difference between drilling, perforation and rock drilling 3.1 Drilling Whether it is earthwork, tunnel engineering or mine excavation engineering; whether it is impact, cutting or vibration, as long as it is a drilling operation, it can be called drilling. 3.2 Perforation In rock excavation operations in open pit and underground mines, boreholes may also be referred to as perforations. 3.3 Rock drilling Percussion drilling and percussion-based drilling operations can be called rock drilling. Equipment using other drilling principles, such as cutting and vibrating drilling operations, cannot be called rock drilling. 04. Definition of down-the-hole hammer, rock drill and power head 4.1 Definition of down-the-hole impactor As the name implies, mining dth bit ,Borehole Drill Bits, the down-the-hole impactor is a tool that uses the principle of down-the-hole impaction to drill holes. (2) The drilling equipment using the roller bit can only be called a roller drill; (3) Rotary cutting drilling equipment shall be called drilling rig, such as cutting drilling rig and rotary drilling rig; (4) Equipment using power head for drilling shall be called drilling rig, such as pipe shed drilling rig and top drive drilling rig; (5) Down-the-hole percussive drilling equipment should be called down-the-hole drill; (6) Open-air top hammer percussive drilling equipment should be called open-air top hammer drilling rig; (7) Tunnel and underground top hammer percussive drilling equipment should be called rock drilling jumbo; (8) Drilling equipment modified from automobiles should be called drilling rig; (9) If the traveling speed is very slow, such as less than 10KM/H,dth drilling hammer, it should be called a drilling rig. Thank you for reading, remember to press the official account! Return to Sohu , see more Responsible Editor:. wt-dthtools.com