QDL highlights DTH hammer evolution and global growth

QDL, also known as Qideli, outlined its role in the evolution of down-the-hole hammer technology, from low-pressure tools to high-pressure valveless designs. The Putian, China-based company says its products now serve drilling markets in more than 50 countries and territories, with annual exports above $10 million.

Why it matters: - DTH hammer technology is central to mining, water well drilling, tunneling and foundation work because it affects drilling speed, depth and wear on equipment. - QDL says its focus on drilling tools, materials and process control has helped the company move from a regional manufacturer into a global supplier. - The company says its products are used in more than 50 countries and territories, with repeat purchases above 97% and annual export value above USD 10 million.

What happened: - Putian, China-based Putian Qideli Engineering Equipment Co., Ltd., which operates as QDL, published a detailed overview of the evolution of DTH hammer equipment and its own product lineup. - The company traces its manufacturing start to 1993 and says it began full-scale DTH hammer production in 2005. - QDL positioned its DTH hammer line as covering low-pressure, medium-pressure and high-pressure drilling needs. - The company highlighted the DHD series, the QD series and other hammer families as part of its portfolio.

The details: - Low-pressure DTH hammers typically operate at 0.5–1.0 MPa, with a focus on durability and simple air distribution. - QDL links this segment to its CIR series and to the P and K series, which it says are widely sold in Russia and Vietnam. - The company says these tools fit small mines, shallow water wells and photovoltaic foundation piling work up to 30 meters deep. - QDL’s medium-pressure range covers 10–15 bar and includes the M series and QP series. - The company says those models deliver a 20% to 40% efficiency gain versus low-pressure alternatives and are suited for small-diameter blast holes and water wells up to 100 meters deep. - High-pressure DTH hammers operate above 15 bar, with working pressure levels cited at 1.5–2.5 MPa or higher. - QDL says high-pressure hammers are built for open-pit mining and deep drilling, including hole diameters up to 1000 mm and depths up to 500 meters. - The company says modern high-end hammers increasingly use valveless designs that let the piston control air paths directly. - QDL says its high-end parts use 42CrMo steel for outer casings, top chucks and valve seats, with quenching and tempering for strength and wear resistance. - The company says pistons and inner cylinders are made from low-carbon special steel, carburized to an HRC 55–58 surface hardness and treated for core toughness. - QDL says those materials help prevent fractures or chipping even under pressures above 3.0 MPa. - The DHD340 and DHD380 models are listed as operating at 10 to 25 bar. - QDL says it uses CNC machining and cylindrical grinding to hold critical dimensions to 0.01 mm tolerance. - The company says its internal bore-processing method improves oil retention and lubrication, which helps reduce friction in abrasive rock such as granite and basalt. - QDL says its QD series increases drilling speed by 15% and maintains high pressure and flushing integrity beyond 1500 meters of continuous operation. - The company says its product range serves open-pit mining, quarrying, water well drilling, foundation engineering, tunneling and underground construction. - QDL says its internal defect feedback rate is below 1%. - The company says it customized the air distribution architecture of its hammers for Morocco’s water well market to reduce clogging. - QDL says a slight increase in exhaust volume improved flushing and eliminated large-scale clogging incidents in that market. - The company says its high-pressure hammers transfer energy directly to the rock face with minimal vibration, which helps protect rotary heads and feed systems from wear. - QDL’s website is More information.

Between the lines: - The article is as much a positioning statement as a product summary. QDL is arguing that manufacturing precision, metallurgy and field customization separate a solutions provider from a commodity supplier. - The strongest claims center on efficiency, durability and export performance, which are the metrics that matter most to buyers in drilling and mining. - The emphasis on regional market fit suggests QDL is tailoring tools to local drilling conditions rather than selling a one-size-fits-all product.

What's next: - QDL says it will continue pushing high-pressure, energy-saving DTH hammer designs for tougher drilling environments. - The company’s next growth appears tied to premium mining and infrastructure markets in Australia, the Middle East and Africa. - QDL’s broader strategy is to expand its global footprint while maintaining quality control and field-specific customization.

The bottom line: - QDL is pitching itself as a Chinese DTH hammer maker that has moved beyond standard manufacturing into precision-engineered, export-focused drilling solutions.