The birth and development of the pneumatic water well drilling rig is a major revolution in drilling technology. It changed the traditional way of cutting and grinding broken rock, make the rock broken into a volume, greatly improving the drilling efficiency and adaptability to hard and complex formation, its significant technical and economic benefits is regarded as one of the symbols of modern drilling technology and measure of drilling technology, brought to the attention of the drilling industry at home and abroad.

Pneumatic DTH hammer drilling is mainly started from drilling blasting hole, well bedrock hole and geological exploration hole. Domestic and foreign researchers in order to expand its application scope, such as DTH hammer hook form, work performance, make it meet the requirements of a variety of engineering applications.

With the research on the mechanism of DTH fracturing rock, the basic theory of various DTH hammer, the internal dynamic process research, the improvement of structural design, processing and manufacturing level, the improvement of component materials and the combination with many other technological methods, the DTH multi-process drilling technology has been formed, which greatly widens its application field.At present, DTH hammer drilling technique has been widely used in water well engineering and gradually become a conventional drilling method.

The use of pneumatic dth water well drilling rigs in rock and complex formations has the following advantages:

(1) high slag discharge wind speed, clean hole bottom, no secondary crushing;Because of no liquid column pressure, the crushing condition of hole bottom is improved without underground water.

(2) the drilling method of pneumatic water well drilling rig is high-frequency impact on the bottom of the hole, reducing the impact on the rock or inclined stratum of the hole inclination, so as to improve the verticality of the drilling, and at the same time, reduce the rock collapse of the hole wall;

(3) compared with rotary drilling, pneumatic drilling wells drilling pressure and torque is much smaller.This can reduce the quality and ability of drilling equipment and create favorable conditions for drilling large caliber hard rock.

(4) pneumatic water well drilling rig has good adaptability and can work in various complicated rock formations (including aquifers);

(5) simple structure, easy to use and maintenance.