The down the hole drill rig is the efficiency champion for drilling in open-air engineering projects! It flexibly adapts to various construction scenarios such as metallurgy, mining, railway infrastructure, and underwater reef blasting. Its exclusive percussion drilling technology makes hard rock drilling a breeze, making it an essential piece of core equipment for engineering construction.【WhatsApp/WeChat/Phone】+86 13837122632
How Does a Down the Hole Drill Rig Work?
The DTH drilling equipment connects the hammer directly to the bottom of the drill rod and feeds it into the borehole. High-pressure air or hydraulic power drives the piston inside the hammer to reciprocate at high speed, transmitting enormous energy directly to the drill bit in the form of shock waves to crush the rock at the bottom of the hole. At the same time, the rotating mechanism drives the drill rod and hammer to rotate slowly, making the drill bit crush the rock surface evenly. The crushed rock cuttings are blown out of the hole by the continuously injected high-pressure air flow along the annular space between the drill rod and the borehole wall. This collaborative working mode of “percussion-rotation-slag discharge” gives the down the hole drill rig unparalleled drilling speed and straightness in hard rock formations.
What Fields Is a Down the Hole Drill Rig Suitable For?
- Mining: In open-pit coal mines and metal mines, it is used to drill large-diameter, deep blast holes, and is a powerful tool for the first process of ore stripping and mining.
- Large-scale infrastructure projects: In slope excavation and foundation treatment of large projects such as railways, highways, and hydropower stations, the DTH boring machine can efficiently complete the construction of presplit holes and anchor cable holes to ensure project stability.
- Urban and special projects: It is suitable for space-constrained occasions such as building foundation pit support and subway construction, and is also commonly used for drilling in special blasting projects such as river dredging and underwater reef blasting.
How to Choose the Right Down The Hole Drill Rig?
- Engineering geology and borehole diameter requirements: First, evaluate the rock hardness and the required borehole diameter and depth. Hard rock formations require a higher level of impact energy; large-diameter and deep-hole operations require the drill rig to have greater torque and thrust.
- Construction site conditions: Consider the site terrain, slope, space size, and traffic conditions. Compact crawler-type equipment is required for narrow sites; wheeled chassis or split design may be preferred for frequent site transfers due to their flexibility.
- Balance of power and efficiency: According to the project schedule and cost budget, weigh the drilling speed, fuel consumption, and maintenance cost of the equipment. Efficient DTH drilling equipment should minimize long-term operating expenses while ensuring productivity.
YG DTH Drilling Rig
YG412: With an overall width of only 2.1 meters, it is specially designed for narrow space operations such as urban subway construction and building foundation pit support. Equipped with a 120kg-class hammer, it features outstanding drilling speed in moderately weathered rock formations and is flexible in movement, making it an ideal choice for projects with severe space restrictions.
YG420: Equipped with a 200kg-class high-torque hammer, it has a maximum drilling diameter of 150mm and a drilling depth of up to 40 meters. It is especially suitable for large-scale projects with extremely high requirements for power and efficiency, such as foundation drilling in large mines and hydropower projects.
| 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 |
FAQ for Down the Hole Drill Rig
Q1: What is the difference between a DTH drilling rig and a top hammer drill rig?
The biggest difference lies in the position of the impactor. For the DTH drilling rig, the impactor is at the bottom of the hole to strike the rock directly, resulting in low energy loss and high drilling efficiency in hard rock. For the top hammer drill rig, the impactor sits at the hole opening, and impact force is transmitted through the drill rod. It is suitable for medium-soft rock and small-diameter drilling.
Q2: How to choose between an integrated type and a split type?
Choose the integrated type (with built-in air compressor) if your site requires frequent relocation and there is no high-power air compressor available. If an air compressor is already on-site and the working location is relatively fixed, the split type can reduce your equipment investment.
Q3: How deep can DTH drilling equipment drill?
It depends on the machine model and impactor configuration. The YG412 has a maximum drilling depth of 30 meters, while the YG420 can reach 40 meters. Deeper holes require larger-size equipment or special configurations.
Q4: How does the equipment perform in hard rock?
The YG series is suitable for rock hardness ranging from f=6–20. Drilling speed will decrease in hard rock with a high f value. However, effective operation can still be maintained by selecting proper bit models and impact parameters.
Q5: Is this DTH boring machine easy to transport?
The machine weighs 6,300 kg with overall dimensions of 6.6 × 2.1 × 2.5 meters. It can be transported on a standard flatbed trailer. The crawler enables self-propelled movement, and no extra towing equipment is needed for loading and unloading.
YG – A Professional DTH Boring Machine Manufacturer
Choosing the right down the hole drill rig is a key decision to optimize project cost and schedule. If you are looking for a reliable drilling solution for your project, or want to learn more about the technical details and configuration information of the YG series DTH drilling rigs, our professional team is ready to provide you with one-on-one consultation and support at any time.【WhatsApp/WeChat/Phone】+86 13837122632
