DTH drilling rigs are high-efficiency hard rock drilling equipment that integrates impact and rotation. Their core feature is the direct connection between the impactor (DTH hammer) and the drill bit. During operation, the impactor can submerge to the bottom of the hole to work directly, fundamentally solving the industry pain point of high energy loss in traditional drill rods. If you are interested, please contact us immediately for more product information.
DTH Drilling Rig Parameter
| Model | YGS100A | YGS153 | YGS180 | YGS300 | YGS350 |
| Total weight | 5.95T | 3.8T | 6.3T | 6.8T | 8T |
| Walking speed | 2.5km/h | 2.5km/h | 2.5km/h | 2.2/3.8km/h | 4km/h 2km/h |
| Diesel tank capacity | 85L | 70L | 85L | 85L | 225L |
| Shipping size | 6500*2100*2400mm | 4640*1980*2260mm | 6600*2110*2500mm | 6600*2220*2600mm | 7600*2350*2800mm |
| Drilling hole diameter | 90-146mm | 83-130mm | 90-146mm | 90-152mm | 90-165mm |
| Power configuration | YCD4R22T-80 | YC2108 33kw/2400rpm | YCD4R22T-80 55kw | YC4DK80-T302 | YC4DK100-T304 73.5kw/2200rpm |
| Highest horizontal hole height | 3.2m | 2.8m | 3.6m | 3.25m | 3.5m |
Working Principle of DTH Drilling Rig
The DTH drilling rig works through the coordinated operation of the impact and rotation mechanisms. First, high-pressure compressed air from an air compressor is delivered to the impactor at the bottom of the hole through the drill rod chamber. The high-pressure air drives the piston inside the impactor to perform a high-frequency reciprocating motion, generating a powerful impact force that directly acts on the drill bit, achieving rock breaking.
Second, the rotation mechanism synchronously drives the drill rod and drill bit to rotate at a uniform speed, ensuring that the drill bit evenly cuts the rock around the hole wall. This ensures a regular borehole with a uniform diameter, preventing problems such as hole wall collapse and borehole deviation. Finally, while driving the impactor, the high-pressure air also promptly blows out rock dust generated during drilling, preventing rock dust from clogging the borehole and ensuring continuous drilling operations.
Application Scenarios of DTH Drilling Rig
- Mining: Whether in open-pit coal mines, metal mines, or non-metal mines, dth drilling rigs can be used for drilling blasting holes and anchor bolt holes, providing pre-operational support for mining operations.
- Hydropower Engineering: In projects such as reservoirs, dams, water diversion tunnels, and hydropower stations, dth drilling rigs are used for dam reinforcement, tunnel pre-support, and foundation drilling, adapting to complex rock environments and ensuring the stability of water conservancy projects.
- Road and Bridge Engineering: In the construction of highways, railways, and bridges, especially in mountainous areas, dth drilling rigs are used for drilling operations for roadbed reinforcement and slope protection, efficiently completing drilling into hard rock and accelerating project progress.
In addition, dth drilling rigs also play an important role in urban demolition, geological exploration, national defense engineering, and underwater drilling in ports and waterways. Different scenarios can select suitable down-the-hole hammer drills or other models according to their needs to maximize cost-effectiveness.
Core Features and Advantages of DTH Drilling Rig
1. High Energy Utilization and Outstanding Drilling Efficiency
Because the impactor acts directly on the bottom of the hole, the impact energy does not need to be transmitted through the drill pipe, reducing energy loss by more than 30% compared to traditional drilling rigs. In hard rock formations, the drilling speed is 2-3 times that of traditional drilling rigs, making it particularly suitable for deep-hole and large-diameter drilling operations.
2. Excellent Drilling Quality
The coordinated operation of rotation and impact results in high drilling verticality, uniform hole diameter, smooth hole walls, and a consistently low drilling deviation rate. This effectively reduces the difficulty of subsequent blasting and grouting processes, lowers rework rates, and improves the overall quality of the project.
3. Strong Adaptability and Convenient Operation
YG DTH drilling rigs include various models such as pneumatic, hydraulic, and electric types, adaptable to the drilling needs of different diameters and depths. Whether in open-pit mines or underground engineering projects, whether in hard rock or weathered rock, they can operate stably. Furthermore, the equipment has a compact structure, and some smaller models are easily movable. With simple transport equipment, site relocation is possible, and the operation threshold is low, requiring no specialized technicians to quickly learn how to use it.
4. Long service life and low maintenance cost
The core components are made of high-strength wear-resistant materials, which have strong impact resistance and wear resistance. Routine maintenance only requires periodic inspection of vulnerable parts such as impactors and drill bits. Moreover, the spare parts are universal and easy to purchase, eliminating the need for high maintenance costs and indirectly reducing the overall construction cost.
Common Problems and Solutions for DTH Drilling Rig
1. Weak Impact and Sudden Drop in Drilling Speed
The core cause is insufficient air supply pressure, a clogged air distribution valve, or piston jamming. This is a common fault in down-the-hole hammer drill rigs.
Solution: Ensure the air compressor output pressure meets the requirements of the impactor; disassemble and inspect the air distribution system, removing sludge, rock powder, and other debris; install an automatic lubricator in the air intake line and inject dedicated rock drilling oil in the correct proportion to ensure internal lubrication.
2. Drilling Deviation
This is mainly caused by bent drill rods, insecure rig mounting, or improper adjustment of the working angle.
Solution: Regularly straighten the drill rods and replace worn joints; re-secure the drill rig to ensure its horizontal stability; monitor the drilling angle in real time during operation and correct it promptly to avoid drilling deviation.
3. Impactor leakage and abnormal venting
This is mostly caused by aging seals, loose threads on the outer casing, or a malfunctioning check valve.
Solution: Regularly inspect the seals and replace them with high-temperature resistant fluororubber seals; tighten all connections to the specified torque; clean the check valve regularly to prevent rock powder from jamming.
4. Drill bit detachment
This is mainly due to a loose connection between the drill bit and drill rod or damaged threads.
Solution: Before the operation, check the connecting threads and tighten the connections; if the threads are damaged, replace the drill rod or drill bit immediately to avoid accidents during operation.
Choose YG
Our dth drilling rigs have been exported to numerous countries and regions worldwide, earning widespread trust through reliable quality and excellent service. Click the “Get Free Quote” button now, submit your project scale, geological conditions, and drilling requirements to receive customized solutions and accurate quotes; discuss equipment selection with us one-on-one; and view more equipment images, construction videos, and customer case studies!
