A down-the-hole drilling rig, commonly shortened to DTH drilling rig, is professional pneumatic rock drilling equipment widely recognized as reliable downhole drilling equipment for hard rock construction. Different from traditional top hammer drilling machines, its core DTH hammer follows the drill bit directly into the borehole. High-pressure compressed air drives the internal piston to strike the drill bit at high frequency, breaking hard rock efficiently, while exhaust air discharges rock cuttings out of the hole continuously. Most mainstream models adopt a durable crawler chassis design, equipped with diesel power systems, hydraulic feeding and rotary mechanisms, supporting adjustable drilling diameter and depth. It can move freely on muddy, sloped, and rugged construction sites. From open-pit mine blasting holes to highway slope reinforcement, this versatile drilling rig has become essential heavy-duty machinery for geotechnical engineering worldwide. If you are interested, please contact Yugong Machinery immediately for more information.
Crawler Down the Hole Drilling Machine Parameter
| Main Specifications | YG 412B-1 | YG 416T-1 | YG 420B-1 | YG 420TA-1 |
| Feeding method | Hydraulic cylinder + chain | Hydraulic cylinder + chain | Hydraulic cylinder + chain | Hydraulic cylinder + chain |
| Feed total length | 4,600 mm | 5,500 mm | 5,500 mm | 5,880 mm |
| Feed extension | 800 mm | 970 mm | 970 mm | 970 mm |
| Feed travel length | 2,680 mm | 3,670 mm | 3,670 mm | 3,670 mm |
| Feed force max. | 15 kN | 15 kN | 15 kN | 20 kN |
| Feed speed max. | 16 m/s | 26 m/s | 26 m/s | 30 m/s |
| Pullback force max. | 25 kN | 25 kN | 25 kN | 45 kN |
| Hole range | Φ90-115 mm | Φ90-115 mm | Φ90-127 mm | Φ90-138 mm |
| Optimum hole depth | 21 m | 21 m | 21 m | 21 m |
| Drill pipe | Φ60 mm × 2 m | Φ60 mm × 3 m | Φ76 mm × 3 m | Φ76 mm × 3 m |
| Hammer | 3.5″ | 3.5″ | 4″ | 4″ |
| Rotation torque | 1,650 N·m | 2,200 N·m | 2,200 N·m | 3,200 N·m |
| Rotation speed | 100-220 rpm | 0-150 rpm | 0-150 rpm | 60-110 rpm |
| Fuel tank capacity | 115 L | 70 L | 70 L | 70 L |
| Tramming speed max. | 2.5 km/h | 2.5 km/h | 2.5 km/h | 3 km/h |
| Gradeability max. | 25° | 25° | 25° | 25° |
| Ground clearance | 310 mm | 310 mm | 310 mm | 310 mm |
| Track frame oscillation angle | / | ±10° | ±10° | ±10° |
| Traction force max. | 40 kN | 40 kN | 40 kN | 54 kN |
| Weight (w/o Options) | 3,950 | 4,620 | 4,620 | 5,500 |
| Dimensions (L×W×H) | 4,450×2,080×2,460 mm | 5,700×2,130×2,300 mm | 5,700×2,130×2,300 mm | 5,600×2,308×2,500 mm |
| Dust Collection | exist | exist | exist | exist |
6 Core Advantages of DTH Drilling Machine
1. High Drilling Efficiency in Hard Rock Strata
The DTH hammer transfers impact energy directly to the drill bit without energy loss through long drill rods. It achieves far faster penetration speed in granite, basalt, and other hard rocks compared with top hammer drills, greatly shortening single-hole construction time and enabling teams to finish more drilling tasks within limited project schedules.
2. High Borehole Straightness with Low Deviation
The hammer works inside the hole to guide the drill bit steadily, effectively avoiding hole deflection and bending. Accurate vertical or inclined boreholes guarantee safe blasting, stable anchor installation, and qualified foundation reinforcement, reducing construction rework caused by unqualified holes.
3. Strong Site Adaptability with Flexible Mobility
Crawler-type down-the-hole drilling rig features excellent off-road performance. It can climb steep slopes, pass narrow mountain roads, and travel on muddy mining surfaces, easily reaching remote construction positions inaccessible to wheeled equipment. Compact lightweight models are also available for small-scale urban engineering projects.
4. Low Long-Term Operating & Maintenance Cost
Standardized, readily available spare parts, including drill bits, DTH hammers, and drill rods, are widely available globally at affordable prices. The mechanical structure is mature and stable with low failure frequency. Proper daily cleaning and lubrication can extend the machine’s service life for many years, balancing initial investment and later running expenses to optimize overall cost performance against different DTH drilling machine price ranges.
5. Multiple Working Mode Compatibility
This downhole drilling equipment supports dry drilling and dust-proof wet drilling options. Wet drilling greatly reduces construction dust, complying with strict environmental protection rules in urban and residential surrounding projects, helping contractors avoid official construction suspension penalties.
6. Simple Operation & Low Labor Dependency
The centralized hydraulic control panel features intuitive operation buttons. New operators can master drilling, feeding, rotation, and walking operations through short professional training. Only one or two workers are required to complete the whole drilling process, effectively cutting labor costs and solving the industry’s shortage of skilled drill operators.
5 Wide Applications for Down The Hole Drilling Machine
1. Open-Pit Mining Blasting Drilling
It is the most common application of the down-the-hole drilling machine. In coal mines, iron mines, copper mines, and quarries, contractors use this rig to drill blast holes for ore stripping and stone exploitation. Fast and stable drilling ensures continuous mining progress and improves overall mine output.
2. Highway, Railway & Hydraulic Engineering
For mountain road excavation, slope stabilization, tunnel pre-blasting, and reservoir reinforcement projects, DTH drilling rigs are used to drill anchor holes, drainage holes and blast holes. Reliable borehole quality guarantees slope safety and infrastructure construction compliance.
3. Quarry Stone Exploitation
Large stone quarries need regular blast hole drilling for block stone mining. The high-efficiency rock-breaking capacity of DTH equipment meets mass drilling demands, supporting standardized and large-scale stone production.
4. Water Well & Geothermal Drilling in Rocky Areas
In mountainous regions with thick rock layers, this rig is ideal for shallow domestic water wells, farm irrigation wells, and geothermal exploration boreholes, solving the difficulty of traditional drilling machines failing to penetrate hard rock formations.
5. Urban Foundation & Disaster Prevention Projects
It is widely applied in landslide governance, foundation consolidation, municipal pipeline construction, and emergency disaster reinforcement. Dust-proof and low-vibration models can work safely near residential buildings without disturbing residents’ daily lives.
7 Complete Buying Advice for Down the Hole Drilling Rig
1. Confirm Local Geological Conditions First
Clarify whether your working strata are soft weathered rock or high-hardness granite. Hard rock projects require high-air-pressure DTH hammers and high-power engines, while soft rock scenarios can select economical light-duty models to avoid overinvestment and unreasonable DTH drilling machine prices.
2. Define Required Drilling Diameter & Maximum Depth
Determine the hole size and depth according to your project type. Blasting and slope anchor projects need specific diameter ranges; deeper drilling tasks require reinforced feed systems and high-torque rotary heads. Matching parameters can effectively prevent equipment overload and frequent breakdowns.
3. Choose Suitable Chassis & Power Configuration
Select crawler chassis for mountain, mining, and muddy sites; wheeled portable models fit flat urban construction zones. Diesel engines are the mainstream choice for off-grid remote sites, while electric DTH rigs are preferred for fixed factories and indoor projects to meet environmental requirements.
4. Match Supporting Air Compressor Parameters
DTH drilling relies on compressed air to drive the hammer. You must select an air compressor with matched pressure and displacement. Mismatched compressor parameters will cause slow drilling speed, insufficient impact force, and serious hammer wear, greatly shortening the service life of core components.
5. Compare Configuration & Brand to Evaluate Comprehensive Cost Performance
Never make purchase decisions only based on the lowest DTH drilling machine price. Focus on core parts brands, hydraulic system stability, and dust-proof and anti-corrosion design. High-quality downhole drilling equipment adopts thickened steel frames and well-known brand hydraulic components, with lower failure rates and longer service life.
6. Verify After-Sales Service & Global Spare Parts Supply
Choose reputable manufacturers that provide multi-language operation manuals, on-site or remote technical training, long-term warranty, and stable global supply of DTH hammers, drill bits, and other wearing parts. Perfect after-sales support can avoid long-term project shutdown losses caused by minor equipment faults.
7. Confirm Environmental & Mobility Requirements
If your construction site is near residential areas or under strict environmental supervision, choose wet dust suppression DTH drilling rigs. For frequent cross-region project transfers, prioritize lightweight crawler models with convenient trailer transportation design to save logistics costs.
Factory Direct DTH Drilling Machine-Choose YG Machinery
If you are searching for a cost-effective down-the-hole drilling rig with transparent DTH drilling machine prices, YG industrial-grade DTH drilling equipment can perfectly match mining, infrastructure, and water well projects. Choose YG reliable downhole drilling equipment now to boost your construction efficiency, cut comprehensive operating costs, and capture more local engineering market share! If you are interested, please contact YG for a discount.
