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2022
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Popularization of Some Knowledge Points on DTH Drill
The size of the down-the-hole bit impactor mainly depends on the hole diameter and rock type. For blast holes, the diameter of DTH holes varies from 89mm to 252mm. The hole diameter less than 89mm mainly adopts the top hammer type, more than 252mm multi-purpose rotary excavation method. Generally speaking, the small diameter of a DTH impactor is its nominal size, that is, the small diameter of a 4 inch impactor is 4 inches in diameter. In general, there is sufficient annular space between the impactor and the hole wall and between the drill pipe and the hole wall for slag removal.
DTH BITThe size of the impactor depends mainly on the pore size and rock type. For blast holes, the diameter of DTH holes varies from 89mm to 252mm. The hole diameter less than 89mm mainly adopts the top hammer type, more than 252mm multi-purpose rotary excavation method. Generally speaking, the small diameter of a DTH impactor is its nominal size, that is, the small diameter of a 4 inch impactor is 4 inches in diameter. In general, there is sufficient annular space between the impactor and the hole wall and between the drill pipe and the hole wall for slag removal. The large size of the matching drill bit is the size of the impactor plus 1 inch. The closer the outer diameter of the drill pipe is to the outer diameter of the impactor, the more slag can be guaranteed and the possibility of sticking is reduced.
From the processing technology of drill pipe (drill pipe), the surface finish and dimensional accuracy of cold drawn pipe are better than those of hot drawn pipe. Good surface finish means that the surface of the steel pipe is not easy to peel off, and the metal debris produced by the peeling will reduce the service life of the impactor. In addition, friction welding should be used between the thread of the drill pipe and the main body, which can increase the strength of the drill pipe. At the same time, good heat treatment of the thread can increase the reliability and strength of the thread, make the connecting and unloading rod smoother, and improve work efficiency and overall perforation speed.
Choose the right down-the-hole drill bit: Let's look at the drill bit again. The main body of the drill is usually processed from cemented carbide, and then heat treated to the specified hardness, so that the compressive stress on the surface has sufficient fatigue resistance, and then inlaid cemented carbide drill teeth. The design of the convex tooth drill can achieve the drilling efficiency and is suitable for medium and soft rocks with low grindability. For hard rock with high grindability, the flat bit can extend the life of the bit. If the outer edge of the button is large enough, grinding the drill bit multiple times can extend the service life of the drill bit and reduce the cost of use. In addition, the concave button drill bit can also be applied to such hard rock with high grindability.
DTH BITPractical application: Open-pit mines and quarries usually require durable down-the-hole bit impactors for drilling, because quarries are usually long-term work, and frequent replacement of impactors is too uneconomical. Some good DTH impactors can be repaired and used multiple times before being completely replaced, such as changing the direction of the outer tube of the impactor. Drilling needs to be carried out in remote locations with poor related facilities. Therefore, the requirements for DTH impactors are simple design, high reliability and adaptability to high wind pressure drilling. In actual use, an important factor must always be considered, that is, the driller. The experienced driller can effectively adjust the drilling parameters, reduce the failure probability of the impactor and extend the life of the impactor.
on the marketDTH BITThere are many kinds of impactors, some cheap and some high-end. However, to measure the value of the impactor, we should not only look at its material and design itself, but also consider the balance between the efficiency brought to the user and the cost of rock meters. Of course, as a user, we also need to consider whether the impactor manufacturer can provide sufficient technical support and guidance for use, which is also very important, which can effectively help our users improve the efficiency of DTH drill bits and reduce the cost of use.
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