For hydropower dam foundation grouting, railway cutting slope anchoring, and open-pit mine bench blasting – the drilling quality of these projects directly determines construction safety and schedule. The dth rig machine, with its hammer directly hitting the hole bottom, achieves a perfect combination of high drilling speed and high precision in hard rock conditions. YG offers you two main models: YG412 (compact, 30m depth) and YG420 (powerful, 40m depth), covering 50-203mm hole diameters and adapting to various work sites from narrow foundation pits to open mines.
YG Dth Rig Machine Parameters
| Model | YG412 | YG420 |
| Drilling diameter(mm) | 50~203 | 50~150 |
| Rock hardness | f=6~20 | f=6~20 |
| Drilling depth (m) | 30 | 40 |
| Walking speed(km/h) | 2.5 | 2.5 |
| Gradeability | 30° | 30° |
| Power type | Diesel | Diesel |
| Fuel tank volume(L) | 85 | 85 |
| Hydraulic oil tank volume(L) | 188 | 188 |
| Weight(Kg) | 6300 | 6300 |
| Dimension(mm) | 6600*2110*2500 | 6600*2110*2500 |
5 Features of the YG DTH Rig Machine
- Compact design for tight spaces: The YG412 is only 2.1m wide, so it can easily enter restricted work areas like urban subway sites and building foundation pits – much more maneuverable than similar-sized equipment.
- Two impactors cover all rock types: The YG412 comes with a 120kg-class impactor for medium-weathered rock, while the YG420 carries a 200kg high-torque impactor to tackle hard rock – fully covering f=6-20 rock grades.
- Intelligent fuel monitoring: Both models come standard with a fuel consumption monitoring system. Actual fuel use is 15% lower than similar down hole drilling equipment, giving a clear long-term cost advantage.
- 30° climbing ability: The crawler chassis gives the machine strong terrain adaptability – it can move itself onto mine benches and slope sites without assistance.
- Large-capacity hydraulic system: The 188L hydraulic oil tank ensures stable operation even under prolonged heavy loads, keeping continuous work reliable.
How to Choose the Right Down Hole Drilling Equipment? Six Key Points
Buying a dth rig machine is not just about the price. These six factors directly determine whether the equipment suits your job:
① Hole diameter: Blast holes range from 50mm to 203mm. The YG412 covers 50- 203 mm fully, while the YG420 focuses on the common 50- 150 mm range – so first define your design hole diameter, then select the model.
② Hole depth: For shallow holes (≤30m), the YG412 is enough; for deeper holes (30- 40 m), choose the YG420 – its larger impact energy keeps the hole bottom clean and maintains drilling efficiency.
③ Rock hardness: Medium-hard rock (f=6-10, e.g. limestone, sandstone) is less demanding; hard rock (f=12-20, e.g. granite, basalt) requires a high-torque impactor; otherwise, drilling speed drops sharply.
④ Air compressor matching: The drilling efficiency of down hole drilling equipment is directly related to the compressor air output. The integrated type is simple and convenient; the split type lets you flexibly match a larger compressor.
⑤ Terrain: On flat ground, a wheel-based drill can work; for slopes and rough mine terrain, you must choose crawler-type – 30° gradeability is the basic requirement.
⑥ Budget: The compact YG412 has a lower purchase cost, suitable for small-to-medium projects and frequent site moves; the powerful YG420 has higher single-unit efficiency, suitable for large mines aiming for maximum output.
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Integrated Vs Split DTH Boring Machine: Which One Is Right for Your Mine?
This is the most common question when customers buy a dth boring machine. Both options have their own suitable scenarios – it all depends on your operation mode:
Integrated (with built-in compressor): High integration – ready to use on arrival, no extra compressor needed. Ideal for projects that require frequent relocation: hydropower infrastructure, road construction, temporary quarries. The downside is that the built-in compressor has limited output, and for ultra-deep holes the slag discharge may not be as good as with a high-capacity split setup.
Split (with external wheel-mounted compressor): The compressor is independent, so you can match different air outputs as needed. Suitable for long-term continuous operation in fixed mines – a large-capacity compressor improves deep-hole drilling speed and slag removal. The downside is extra transport and hook-up time, making relocation less efficient.
Quick rule: if your project is “multiple sites, short cycles, frequent moves” → choose the integrated dth boring machine; if it’s “single mine, long cycle, continuous extraction” → choose the split type.
Wide Applications of Down Hole Drilling Equipment
- Metallurgy and mining: Open-pit mine bench blast hole drilling – a core tool for daily mine production.
- Building stone quarries: Blast drilling for limestone, granite and other construction stone – drilling accuracy directly affects blast fragmentation.
- Railway and highway construction: Cutting excavation and slope anchor hole drilling – the down the hole drill rig excels especially in hard rock sections.
- Hydropower foundation: Dam foundation grouting holes and consolidation holes – require high precision in depth and deviation.
- Defence and underground works: Military excavation and underground chamber blast hole drilling.
- Underwater rock blasting: With special waterproof impactors, used for channel and port underwater rock drilling and blasting.
FAQs about the Down the Hole Drill Rig
Q1: Both YG412 and YG420 weigh 6300kg – what’s the difference?
The two models share the same chassis, but differ in impactor size and drilling capability. The YG412 has a 120kg impactor, max hole diameter 203mm, depth 30m; the YG420 has a 200kg impactor, max hole diameter 150mm, depth 40m.
Q2: Can a dth rig machine work underwater?
Yes. With a special waterproof impactor, it can be used for underwater drilling and blasting in channel improvement and port construction.
Q3: What is the fuel consumption like?
Both machines have an intelligent fuel monitoring system. The 85L diesel tank supports a full shift, and overall fuel consumption is about 15% lower than similar equipment.
Q4: Do I need to buy drill pipes separately?
Drill pipes are usually configured according to your drilling depth. Contact YG with your specific conditions for a tailored solution.
Q5: Is the equipment easy to transport between sites?
The machine dimensions are 6600×2110×2500mm and weight 6300kg – it can be transported by flatbed truck and loaded/unloaded by crane.
Contact YG
No matter the size of your project, YG can match you with the most suitable dth rig machine solution. From urban foundation pit support to large-scale mining, from 30m shallow holes to 40m deep holes, the YG412 and YG420 provide reliable and efficient drilling solutions. Contact YG for detailed selection advice and equipment quotes.
