What are the classifications of down-the-hole drill bits?
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The drilling tool consists of a drill rod, a ball-tooth drill bit and an hammer. When drilling, drill with two drill pipe adaptors. The rotary air supply mechanism is composed of a rotary motor, a rotary reducer, and a rotary air supply. The rotary reducer is a closed heterosexual component of the three-stage cylindrical gear, which is automatically lubricated by a screw oiler. The air supply gyrator is composed of a connecting body, a seal, a hollow main shaft and a drill pipe joint, and is provided with a pneumatic grip for connecting and unloading the drill pipe. The lifting pressure regulating mechanism is made by the lifting motor to realize the lifting action of the rotary mechanism and the drilling tool with the help of the lifting reducer and the lifting chain. In the closed chain system, a pressure regulating cylinder and a movable pulley block are installed. When the blast furnace opening drill bit manufacturer works normally, the piston rod of the pressure regulating cylinder pushes the movable pulley block to make the drilling tool realize decompression drilling.
1. End face convex type: This drill is divided into two forms, single boss and double boss end face, the latter is mainly used for larger diameter DTH drills. Convex DTH bits can maintain a high rock drilling rate when drilling medium-hard and hard abrasive rocks, but the straightness of the borehole is poor, so it is not suitable for rock drilling with high blast-hole straightness requirements project.
2. Flat end face type: The drill bit of this shape is relatively sturdy and durable, and is suitable for drilling hard and extremely hard rocks, as well as medium and soft rocks where the straightness of the blast-hole is not required.
3. End face concave type: The end face of the drill bit of this shape has a conical concave part, which is the slight nucleation effect of the drill bit during the rock drilling process to maintain the centering performance of the drill bit, and the drilled blast-hole has a good straight line. This kind of drill has good powder discharge effect and fast drilling speed. It is the most commonly used DTH drill in the market.
4. End face deep concave center type: The drill bit of this shape is evolved from the same type of ball-tooth drill bit. The center part of the end face of the drill bit has a deep concave center part. It is used for nucleation in the process of rock drilling, to ensure the straightness of the blast-hole when drilling deep holes, and is only suitable for drilling soft and medium hard rocks.
