Tunnel Drilling Rig: Introduction & Main Models

1. What is a Tunnel Drilling Rig?

A tunnel drilling rig is a specialized piece of equipment designed exclusively for underground drilling operations within mine roadways and tunnels. It is an indispensable tool in geological exploration, mine safety, and underground engineering, serving core purposes such as deep geological prospecting, gas drainage, water injection/drainage, ventilation channel construction, and grouting for fire prevention and pressure relief.

As a leading provider of mining drilling solutions, Puhua Energy Equipment Technology (Shandong) Co., Ltd. has integrated advanced design concepts into its tunnel drilling rigs, making them highly adaptable to the complex and confined environments of underground mines. The key advantages of Puhua’s tunnel drilling rigs include excellent disassembly performance, lightweight components, and 0°–360° omnidirectional drilling angle adjustment. Unlike surface drilling rigs, they typically do not require a mast and are instead fixed on single-leg or double-leg columns for stable operation.

Core Structure & Classification

Puhua’s tunnel drilling rigs are composed of four core modules: power unit, rotator, drill rod pulling/pushing mechanism, and drill rod screwing/unscrewing device. Based on power transmission and structural design, they are divided into two main categories:

Spindle-type (including spiral differential feed): Characterized by stable rotation and high precision, suitable for medium-depth drilling with strict hole quality requirements.

Power-head type (mechanical and full-hydraulic): The mainstream design in modern mines, offering high torque, stepless speed regulation, and strong adaptability. Puhua focuses on full-hydraulic power-head tunnel drilling rigs (ZDY series), which feature dual-pump systems for independent control of rotation and feed, significantly improving operational efficiency.

In terms of drive mode, Puhua provides pneumatic, hydraulic, and electric options to meet the safety and power supply standards of different mining regions worldwide.

2. What Are the Main Models of Tunnel Drilling Rigs?

The most widely used tunnel drilling rigs in global mining operations are classified by rated torque, with the ZDY series being the industry benchmark. 

The model nomenclature is standardized: 

ZDY stands for full-hydraulic tunnel drilling rig (Z=Drill, D=Power-head, Y=Hydraulic); the number represents rated torque (N·m);

 S： denotes a dual-pump system;

 L indicates a crawler-mounted walking structure.

Puhua Energy Equipment Technology offers a complete lineup of ZDY series tunnel drilling rigs, covering low, medium, and high torque requirements. The four most popular models are:

1.ZDY3200S (Full-Hydraulic, Dual-Pump, Stationary)

Rated Torque: 3200 N·m

Key Features: Compact structure, dual-pump independent control, 0°–±90° drilling angle adjustment, suitable for small-to-medium mine roadways.

Applications: Gas drainage holes, water exploration/drainage holes, geological prospecting holes in narrow roadways (section > 6.5 m², height > 2.3 m).

Puhua Advantage: Equipped with a high-precision hydraulic control system, reducing energy consumption by 15% compared to standard models, and featuring a quick-connect design for 30% faster on-site assembly.

2.ZDY4000S (Full-Hydraulic, Dual-Pump, Stationary)

Rated Torque: 4000 N·m

Key Features: Balanced performance, strong feed force (up to 110 kN), stable rotation, compatible with φ50–φ73 drill rods.

Applications: Medium-depth drilling (200–300 m) in coal mines and non-ferrous metal mines, including gas drainage, water control, and geological exploration.

Puhua Advantage: Integrated with a load-sensing hydraulic system, automatically adjusting power output based on drilling load, extending component service life by 40%.

3.ZDY4000L (Full-Hydraulic, Crawler-Mounted)

Rated Torque: 4000 N·m

Key Features: Puhua’s flagship model—ultra-compact design (only 2/3 the size of similar products), dual-crawler chassis for flexible movement in confined tunnels, 360° azimuth adjustment, and ±90° tilt adjustment.

Applications: The first choice for underground drilling in large mines, capable of rapid relocation between working faces, suitable for high-gas mines and complex geological conditions.

Puhua Advantage: Patented crawler steering technology, enabling in-situ turning in 1.2 m-wide roadways; IP65-rated electrical components, resistant to moisture and dust in underground environments.

4.ZDY6000L (Full-Hydraulic, High-Torque Crawler-Mounted)

Rated Torque: 6000 N·m

Key Features: Heavy-duty design, maximum feed force 165 kN, deep drilling capacity (up to 500 m), suitable for hard rock formations (rock hardness coefficient f ≤ 10).

Applications: Deep geological exploration, high-pressure gas drainage, and large-diameter engineering holes in large-scale mines.

Puhua Advantage: Equipped with a powerful hydraulic power station and intelligent monitoring system, real-time displaying torque, pressure, and drilling depth; supporting one-key drilling and automatic rod handling, reducing labor intensity by 60%.

3. What Are the Core Advantages of Puhua’s Tunnel Drilling Rigs?

Puhua Energy Equipment Technology (Shandong) Co., Ltd. has been focusing on R&D and manufacturing of mining drilling equipment for over a decade, and its tunnel drilling rigs stand out in the global market with the following unique strengths:

1. Ultra-Adaptable to Confined Spaces

All Puhua tunnel drilling rigs adopt a modular and lightweight design, with each component weighing less than 200 kg, facilitating manual handling and assembly in narrow mine roadways. The crawler-mounted models (ZDY4000L/6000L) feature a narrow body (width ≤ 1 m) and low height (≤ 1.75 m), easily passing through mine doors and low-altitude roadways.

2. Omnidirectional & High-Precision Drilling

Puhua’s rigs support 0°–360° azimuth adjustment and ±90° tilt adjustment, enabling horizontal, upward, downward, and top/bottom plate drilling to meet various underground construction needs. The precision positioning system ensures a hole deviation rate of less than 1%, meeting the strict requirements of gas drainage and geological exploration.

3. Efficient & Reliable Hydraulic System

The full-hydraulic design with a dual-pump system allows independent control of rotation and feed, with stepless speed and torque adjustment. Puhua uses high-quality imported hydraulic components (e.g., Rexroth, Parker) and a multi-stage filtration system, ensuring stable operation in harsh underground environments and reducing downtime by 50%.

4. Safe & User-Friendly Operation

Equipped with a centralized control console, operators can perform all functions (drilling, rod handling, moving) remotely, away from the hole opening, enhancing safety. The rigs feature multiple safety protections: over-pressure, over-torque, anti-runaway, and emergency stop functions, fully complying with international mine safety standards (e.g., ATEX, MA).

5. Low Maintenance & Long Service Life

Puhua’s tunnel drilling rigs are designed for easy maintenance, with quick-wear parts (e.g., chuck jaws, seals) having high universality and easy replacement. The main components (except consumables) require no special maintenance for 6–12 months, reducing overall maintenance costs by 30–60% compared to competitors.

4. How to Select the Right Tunnel Drilling Rig Model?

Choosing the appropriate tunnel drilling rig depends on three core factors: mine conditions, drilling requirements, and operational efficiency. Puhua Energy Equipment Technology provides professional selection guidance for global customers:

1. Based on Mine Roadway Size

Narrow roadways (width < 2 m, height < 2.5 m): Choose ZDY3200S or ZDY4000L (ultra-compact crawler model) for easy passage and maneuverability.

Medium roadways (2 m ≤ width < 3 m): ZDY4000S (stationary) or ZDY4000L (crawler) are ideal, balancing performance and space adaptability.

Large roadways (width ≥ 3 m): Opt for ZDY6000L (high-torque crawler) for deep drilling and heavy-duty operations.

2. Based on Drilling Depth & Torque Demand

Shallow drilling (≤ 200 m): ZDY3200S (3200 N·m) meets basic gas drainage and water exploration needs.

Medium drilling (200–400 m): ZDY4000S/L (4000 N·m) offers stable performance and high efficiency.

Deep drilling (≥ 400 m) / hard rock: ZDY6000L (6000 N·m) provides sufficient torque and feed force for complex formations.

3. Based on Mobility & Operational Efficiency

Fixed working faces: Stationary models (ZDY3200S/4000S) are cost-effective with stable performance.

Frequent relocation between working faces: Crawler models (ZDY4000L/6000L) are preferred, with Puhua’s dual-crawler design enabling fast movement and in-situ turning.

4. Puhua’s Customization Service

For customers with special requirements (e.g., ultra-narrow roadways, high-temperature environments, remote control), Puhua provides customized tunnel drilling rig solutions, adjusting parameters, structure, and configuration to meet specific operational needs.

Conclusion

Tunnel drilling rigs are core equipment for safe and efficient mining operations, and the ZDY series (ZDY3200S, ZDY4000S, ZDY4000L, ZDY6000L) represents the highest level of global tunnel drilling technology. Puhua Energy Equipment Technology (Shandong) Co., Ltd. integrates advanced design, reliable quality, and professional service into its products, providing global mining customers with efficient, safe, and cost-effective underground drilling solutions. Whether for small-scale coal mines or large-scale non-ferrous metal mines, Puhua’s tunnel drilling rigs can meet diverse operational needs and become a reliable partner for mine productivity improvement.