Unlike top hammer drilling tools, DTH drilling tools are a type of drilling machinery that uses compressed air as a power source, with the power unit entering the rock hole to perform drilling. They are widely used in drilling engineering both domestically and internationally.

DTH drilling tools typically consist of a drill bit, a hammer, and drill rods.3They are equipped on a drilling rig.(Drilling frame)and are also equipped with an air compressor to form a drilling unit. Depending on the pressure of the compressed air used by the DTH drilling tools, they are usually classified into low-pressure DTH tools.(The pressure is between0.6 to 0.8 MPa.Medium-high pressure DTH tools.(The pressure is between1.0 to 2.0 MPa.And high-pressure DTH tools.(The pressure is greater than2.5 MPa.These are different types. Due to the different driving air pressures, the drilling efficiency of DTH tools varies, and the performance requirements for the products are also different. Therefore, there is a significant price difference between low-pressure DTH tools and medium-high pressure DTH tools.3Market situation of DTH drilling tools in China.

   At present, the diameter range of low-pressure down the hole drill bits used is 68-200mm, with a larger usage of drill bits with diameters of 90-130mm. The matching low-pressure down the hole impactors mainly come in three specifications: 90 type, 100 type, and 150 type. Low pressure down the hole impact drilling tools have a relatively low market price and are one of the preferred products for small construction projects, individual quarries, and construction teams with poor rock drilling equipment in China. Medium to high pressure down the hole rock drilling tools are widely used in construction sites such as open-pit and underground mines, quarries, hydropower projects, water well drilling, mineral exploration, rock steel cable anchoring hole drilling, geothermal excavation, and subway engineering excavation pile support. They have a series of characteristics such as fast drilling speed, high flatness of the borehole, smooth borehole wall, and good rigidity of the drill rod and impactor. The high-pressure down the hole drilling tool products have very strict requirements in terms of material, mechanical processing, heat treatment process, and overall fitting performance of the product. At present, domestic high-pressure down the hole drilling tools are in the research and development stage of product performance and quality. With the continuous improvement of technical performance indicators and product quality stability of domestic high-pressure down the hole drilling tools, high-pressure down the hole drilling tool products will have greater expansion space in domestic and foreign markets.