Choosing the right type of DTH bit can effectively improve work efficiency, reduce costs and consumption, and speed up the progress of the project. DTH bit selection should consider these issues technically:

　　(1) Reliability. This is one of the important factors to evaluate the technical performance index of the DTH bit, which is mainly determined by technical parameters such as the DTH bit's ability, accuracy, strength, and component durability. According to the construction characteristics of the DTH bit, we generally adopt the idea of ​​a "big horse-drawn trolley" to select the drilling rig to ensure the reliability of the DTH bit in complex working conditions.

　　(2) Maintainability. During the life cycle of DTH bit, inspection, maintenance, repair, and transformation are the main content of DTH bit maintenance. Therefore, when selecting DTH bit, it is necessary to fully consider the maintainability of the drilling rig, that is, drilling

　　Machine inspection, maintenance, and repair are very convenient and simple, and the parts are interchangeable, which will reduce maintenance costs and improve construction efficiency.

　　(3) Compatibility. Each component of the DTH bit is relatively independent and self-contained. It is compatible with a variety of working conditions, a variety of different products and parts, and has good compatibility with existing models. It can reduce costs and better adapt to the market. Change, after simple deployment, diversified production and construction requirements can be completed. If some parts can be used with common parts in the market, priority should be given to DTH bit selection to reduce the bottom cost.

　　With the development of the DTH bit in the direction of large-scale and automation, the possibility of manual control and inspection of the DTH bit is becoming less and less, so that the DTH bit has higher self-controllability, which is also the basic index to measure DTH bit performance.