Publish Time: 2022-07-26 Origin: Site
DTH drill bit is divided into low pressure DTH drill bit, medium and high air pressure DTH drill bit. The down-the-hole drill bit is used in conjunction with the down-the-hole impactor, which has the characteristics of straight drilling, fast speed and deep drilling.
What is the purpose of the DTH hammer bit?
What are the characteristics of the use of the DTH hammer bit?
What are the structural features of DTH hammer bit?
The DTH hammer bit is a tool that transmits impact energy and directly breaks the rock. It forms an integral mechanism with the impactor. The structure and quality of the drill bit directly affect the use of the DTH hammer. Therefore, according to the different physical and mechanical properties of rocks, reasonable selection of drill bits with different forms and structures is an important technical condition for improving drilling efficiency and increasing the service life of the drill bit.
The forms of drill bits used for DTH hammer drilling are basically: ① concentric alloy ball-tooth drill bit, ② eccentric alloy ball-tooth drill bit, ③ blade type alloy drill bit, ④ reverse circulation alloy ball-tooth drill bit.
1) DTH hammer bit has high efficiency, long service life, low required rotation speed, small torque, small axial pressure, and has the effect of preventing hole skew and correcting skew. At the same time, the loss of equipment and drilling tools is also very small, which has been recognized by people.
2) Using DTH hammer bit for down-the-hole hammer drilling is currently one of the most effective ways to improve the efficiency of hard rock drilling. Production practice shows that its drilling efficiency is about 10 times higher than that of rotary drilling, especially in arid water-deficient areas and exposed rock areas, it can effectively drill to improve production efficiency and reduce construction costs.
3) The ability of air DTH hammer drilling process to carry rock powder mainly depends on the air return speed. When the outer annulus clearance of drilling is too large, it is difficult for rock powder to return. DTH hammer bit is suitable for drilling construction with good diameter below 400mm.
There are many kinds of DTH hammer bit, but from the shape of cemented carbide in broken rock, it can be divided into two kinds: one is blade bit and the other is column tooth bit. The former is used in general soft formation and the latter is used in hard formation.
DTH hammer bit is more complex than conventional rotary drilling bit in downhole stress, so its structure is also more complex. Generally, the blade edges of the blade edge drill are arranged in a cross shape, X shape or in the form of leading edge. Almost all the alloys of cylindrical bit adopt the method of interference cold pressing. The diameter of DTH hammer bit is 220mm, which is commonly used in China. The diameter of large-diameter super DTH hammer can reach 762mm, while the cluster large-diameter DTH hammer can drill 1016mm diameter holes.
At Zhuzhou Jinxin Group Cemented Carbide Co., Ltd., you can get the best quality DTH hammer bits and the most intimate after-sales service.