Views: 198 Author: Site Editor Publish Time: 2022-07-20 Origin: Site
The DTH hammer bit is a kind of drill bit used in conjunction with the down-the-hole impactor. Widely used in mining/ quarry/ hydropower engineering/ drilling wells/ side column support, etc.
What are the advantages of using a DTH hammer bit?
How to choose a DTH hammer bit according to the nature of the work?
How to maintain the DTH hammer bit?
The drilling process using the DTH hammer bit is an underbalanced drilling process that uses compressed air as the power medium to drive the DTH hammer to work. Compressed air is also used as a good flushing medium to carry the bottom hole cuttings to the surface. Compared with the conventional drilling process, the air DTH hammer drilling process can greatly improve the drilling efficiency when drilling in the formation with higher rock hardness. The high drilling efficiency of air DTH hammer has the following favorable factors:
(1) The load acting on the cutting tool of the DTH hammer is an impact load, and the contact stress can reach a very high value instantaneously, and the stress is concentrated, which promotes the development of rock cracks.
(2) Cutting tool wear is reduced.
(3) The impact frequency is high, which is conducive to rock crushing.
(4) The bottom of the well is clean, which minimizes repeated crushing.
The parameters affecting the drilling speed of the DTH hammer bit are mainly axial pressure, rotational speed, impact energy and impact frequency. For rocks with different hardness, the selection of parameters is quite different. When drilling into rock with small hardness, the drilling parameters of the DTH hammer bit should mainly meet the requirements of rotary cutting and crushing; when drilling into hard but poorly cemented rock, the drilling parameters should meet the needs of impact crushing to form Volume crushing; when drilling hard and dense rock, the drilling parameters should meet the two rock crushing effects of impact and rotation.
(1) Regularly replace the carbon brush of the DTH hammer bit and check the spring pressure with a professional electrician.
(2) Ensure that the DTH hammer bit is in good condition and clean and the dirt is removed.
(3) The DTH hammer bit should be checked regularly by professionals, and those that are seriously damaged and can no longer be used should be replaced in time.
(4) Timely supplement the body screw fasteners lost on the body due to the operation.
(5) After the DTH hammer bit is used, it should be returned to the tool warehouse for safekeeping. Avoid overnight storage in personal tool cabinets.
Zhuzhou Jinxin Group Cemented Carbide Co., Ltd. has focused on the production and development of DTH hammer bit for more than several years, and they have always put the needs of customers as their top priority.