Буровая установка DTH
FAQ for DTH Drilling rig
A down-the-hole (DTH) drill is a rock drilling equipment specially designed for mining drilling operations. Its core feature is that the percussive hammer works together with the drill bit at the bottom of the borehole—different from traditional rock drills with external percussion mechanisms, this structure greatly reduces energy loss and improves drilling efficiency.
- The percussive hammer of the down-the-hole (DTH) drill descends to the borehole bottom with the drill bit to work directly, greatly reducing energy transmission loss; its drilling efficiency is 30%–50% higher than that of conventional rock drills, and it consumes less energy for the same drilling depth.
- Its underground models adopt explosion-proof design, featuring a compact and flexible structure suitable for drilling in narrow roadways; open-pit models boast strong power to handle large-diameter (Φ80~Φ300mm) and deep-hole (50~200m) blasting pre-split hole operations, and can also be extended to rock drilling projects such as hydropower and highway subgrades.
- During operation, high-pressure airflow realizes slag removal and cooling simultaneously, which not only avoids bit jamming and burying, but also reduces drill tool wear, extending the service life of drill tools by 20%–40% and lowering equipment failure rates.
- The drill features minimal drill pipe swing during drilling, with borehole deviation controlled within ±2° and regular, smooth borehole walls, which can accurately meet the high-precision construction requirements of mining blast holes and geological exploration holes.
- Open-pit blasting hole depth is set at 1.05–1.1× bench height, with 0.5–2m subdrilling to avoid stumps; diameter depends on rock hardness—Φ100–300mm for hard rocks (f≥8), Φ80–120mm for soft rocks (f＜6), matching explosive cartridge specs.
- Underground blasting hole depth is 1.8–3.5m to fit roadway sections and prevent over/under-break; prioritize small-diameter tools to suit narrow spaces and avoid operation restrictions.
- Exploration hole depth varies by stage: 50–200m for reconnaissance (penetrating overburden to ore beds), 200–500m for detailed surveys (covering full ore beds plus 20–50m underlying strata); deepen appropriately in complex areas for sampling integrity.
- Exploration hole diameter is chosen by depth and formation—Φ46–75mm for shallow holes (＜100m, matching core barrels), Φ75–130mm for deep/broken formations (reducing blockage); match probe size if in-situ testing is needed.
- For high altitudes, choose plateau supercharged diesel or cold-resistant electric power with ≥15% power redundancy. For high dust, install a 3-stage dust filter and motor vent dust nets. For high humidity, use IP55 waterproof electric power; for diesel models, optimize fuel tank waterproofing and add oil dehumidifiers.
- For high altitudes, apply temperature-resistant fluororubber seals and metal-elastic double seals for key parts. For high dust, adopt labyrinth-lip-dust retainer triple seals and high-temp sealant for frame gaps. For high humidity, use hydrolysis-resistant polyurethane seals, desiccant in airtight chambers and drain holes in hydraulic systems.
- For high altitudes, use a dry-wet combined dust removal system with 20% higher-power fans and anti-freezing devices. For high dust, deploy high-airflow pulse dust collectors with PTFE membrane filters and dust monitors. For high humidity, prioritize moisture-proof dry dust removal, coat filters with anti-caking layers and clean wet dust deposits regularly.
- Air compressor’s rated discharge pressure should be ≥ drill impactor’s rated working pressure + pipeline drop margin: 0.3–0.5 MPa for normal conditions, 0.5–0.8 MPa for deep-hole/long-distance transport.
- Air compressor’s rated displacement should be ≥ drill’s rated air consumption + loss margin: 10%–20% for single-rig use, 20%–30% for multi-rig/high-dust conditions.
- For high altitudes, use plateau supercharged air compressors or add 20%–30% displacement margin; for wet clay formations, boost displacement by 15%–20% to prevent drill jamming.
- Check pipeline tightness regularly to cut pressure/displacement loss; adjust parameters by bit diameter/hole depth to avoid energy waste or drill wear/efficiency drop.
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