YN27C Internal Combustion Rock Drill

The Ultimate Portable Drilling Solution for Mine Tunnel Projects & Extreme Environments

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Industrial Overview: The YN27C Internal Combustion Rock Drill in Mine Tunnel Projects

In modern mining and tunnel engineering, efficiency, adaptability, and portability are critical. The YN27C Internal Combustion Rock Drill stands out as a premier choice for challenging geological conditions. Unlike traditional pneumatic rock drills that require massive external air compressors and heavy hoses, the YN27C is completely self-powered. It integrates a miniature gasoline engine, an air compressor, and the rock drilling mechanism into a single, hand-held unit.

For mine tunnel projects, particularly in remote areas, high altitudes, or rugged terrains where laying down electrical lines or piping compressed air is economically unfeasible, the YN27C offers unparalleled operational flexibility. It is designed to drill holes in rock for blasting, splitting, and anchoring, making it an indispensable tool for tunneling, shaft sinking, and road building in mountainous regions.

Key Engineering Advantages:

Zero External Power Needed: Runs entirely on a small internal gasoline engine.
Multi-functional Capability: Easily converts from drilling to crushing, tamping, and splitting.
High Portability: Weighing under 30kg, it can be carried by a single operator to any remote work face.

YN27C Production Workshop and Technology Setup

Commercial Status & Global Development Trends

The global demand for infrastructure, underground mining, and tunnel construction has driven significant growth in the portable rock drill market. As mining operations expand into deeper and more remote deposits, the logistics of transporting heavy machinery become a bottleneck. This has elevated the commercial status of internal combustion rock drills like the YN27C.

1. Remote Exploration and Greenfield Mine Development

In the early stages of mine development (greenfield projects), infrastructure is virtually non-existent. Transporting heavy diesel air compressors to high-altitude mine sites or dense forest tunnels is extremely costly. Geologists and early-stage construction crews rely on the YN27C to perform initial rock sampling, blast hole drilling for access roads, and trenching. Its ability to start quickly in temperatures ranging from -40°C to 40°C makes it a reliable asset globally.

2. Tunneling in Extreme Geotechnical Conditions

In tunnel projects, unexpected geological shifts can lead to water ingress, rockbursts, or structural collapses. During such emergencies, pneumatic and hydraulic lines are often severed. The YN27C functions as an essential emergency rescue tool, allowing rescue teams to quickly drill holes for ventilation, communication lines, or rescue capsules without relying on the tunnel's main power grid.

3. Technological Advancements in Internal Combustion Drills

Modern trends in YN27C manufacturing focus on reducing emissions, enhancing fuel efficiency, and improving operator safety through advanced vibration-damping handles. Manufacturers are adopting high-strength alloy steels and state-of-the-art heat treatment processes to ensure the internal piston, cylinder, and impact mechanism can withstand prolonged high-frequency stress.

Company Profile

SHENLI is a leading supplier of superior pneumatic tools for the construction, mining and industrial markets. Since 2005, the Shenley brand has been synonymous with quality and innovation.

For over a decade, the SHENLI brand has represented performance, innovation and quality in the pneumatic tool industry. The SHENLI product line now offers a complete line of pneumatic tools, a wholly owned factory, pneumatic tools and a full line of accessories. With superior product performance, as well as superior product and reliability, competitive pricing for factory direct sellers, exceptionally ergonomically designed tools and quality warranty terms, Shenley has become an industry leader. We take every customer's problem seriously so that we can solve our common problems, and choosing Shenley is just the beginning for you. SHENLI will provide reliable service and support through every step of the process from product consultation to final delivery.

Company Mission & Corporate Culture

Company Mission

Striving to be a world-class supplier of rock drills

Adhering to the development experience of pneumatic tools for many years, Shenli takes "customer first, service first" as the spirit of enterprise, and "strive to become the world's first-class rock drill provider" as the vision, constantly innovate technology, strive for perfection, and open up a broader market for customers.

Corporate Culture

More attentive: Work together, keep improving.
More Focused: With sincerity, you can achieve anything.
More thoughtful: Customer first, service first.
Dare to innovate: Keeping up with the times and forging ahead.

Global Projects & Mine Tunnel Cases

Dutch Tunnel Engineering Project

The Dutch customer came to our factory and was satisfied with the production equipment, raw materials as well as advanced processes that we have in place. The client then signed a custom order for 500 units after being shown all of these great things about what is possible here at this facility! They hope long-term cooperation can occur between both parties moving forward since they are happy overall from their visit today.

U.S. Mine Tunnel Exploration Project

The American customer visits our factory and has an in-depth negotiation to reach a long-term cooperation relationship, focusing on supplying high-durability drills for deep underground mining operations.

Japanese Subway Tunnel Project

The Japanese customer was very satisfied with the factory equipment and production process. He also proposed that they work together on design, which would give them an edge over their competitors who do not have this partnership!

Japanese Subway Tunnel Project Cooperation 01

India Coal Mine Tunnel Drilling Project

We are delighted that Indian customers have visited our factory to learn more about ISO 9001 certification, which opens up new opportunities for us to collaborate. We explained in detail which parts go to which products, and how many different assembly lines there are, and we all understood. He is looking forward to working with us. This is our first cooperation, and we still maintain a cooperative relationship.

Factory Tour & Manufacturing Process

Raw materials: All materials are sourced from domestic and international well-known suppliers, and the quality is free from any flaws.

Processing: We have all precision machining production lines, including high-precision CNC lathes, and multi-axis CNC milling machines. Machine tools are from well-known brands, and online quality assurance is performed at every step.

Heat treatment: All heat treatment activities are carried out in a sealed quench furnace with facilities including but not limited to carburizing, nitriding, volume quenching, annealing, and tempering.

Grind: We have world-class grinding equipment that is capable of maintaining dimensions to within 3 microns. The grinding line includes state-of-the-art equipment including universal CNC grinding machines, cylindrical CNC grinding machines with process gauges, CNC internal diameter grinding machines, and universal CNC grinding machines.

Surface treatment: We offer a range of surface treatment options painting and other processes. These processes increase the service life of the tools and provide them with an appearance that meets the customer's requirements.

Assembly & Commissioning: Assembly and testing are carried out by our dedicated team on custom-built assembly platforms and test machines. Each assembled rock drill is tested for torque, BPM, and air consumption. After successful testing, each machine receives a test certificate to ensure its quality.

Quality Control

Quality standard:

Customer satisfaction is achieved through the provision of 'zero defect' products and timely delivery.
Ensuring an orderly programme.
Increased production efficiency through the latest technology and equipment.
The company provides regular training to its employees in accordance with the defined objectives, training needs and requirements.

Experienced quality inspectors use a variety of precision instruments and special gauges to test the dimensional and functional performance of all components. Regular internal and external quality audits are carried out to continuously improve quality.

Our Certifications

Epiroc Intellectual Property Certificate

CE certification is a mandatory conformity mark for certain products sold within the European Economic Area (EEA). CE stands for "Conformité Européenne" which translates to "European Conformity." The CE mark certifies that a product has met EU consumer safety, health or environmental requirements. CE certification also allows manufacturers to freely circulate their products within the EEA. ISO 9001:2015 is an international quality management system (QMS) standard that outlines requirements for a quality management system. The standard is designed to help organizations ensure they meet customer and regulatory requirements. Our factory has been ISO 9001:2015 certified since 2015, and all of our products are CE certified. This ensures that our products meet high standards of quality and safety, and that they can be freely circulated within the EU. CE certification and ISO 9001:2015 certification are just two of the ways we ensure that our products are of the highest quality.

Technical Deep-Dive: Operation and Maintenance of YN27C in Tunneling

To maximize the lifespan of the YN27C Internal Combustion Rock Drill during intensive tunnel excavation, operators must adhere to precise operational protocols and scheduled maintenance. The integration of the two-stroke engine requires a specific fuel-to-oil ratio to ensure optimal lubrication of the cylinder and crankcase under high thermal loads.

Fuel Mixture & Engine Performance

The engine typically runs on a mixture of gasoline and two-stroke engine oil. Using the correct ratio prevents carbon buildup on the spark plug and exhaust port while ensuring that the piston does not seize during continuous drilling. In enclosed tunnel spaces, proper ventilation is essential to manage exhaust gases, even though the YN27C is designed for clean combustion compared to older models.

Impact Mechanism & Rock Bit Selection

The impact energy of the YN27C is transmitted directly to the drill steel and bit. Choosing the right chisel or moil point is critical. For hard rock formations in mine tunnels, tungsten carbide-tipped drill bits are highly recommended. Regular inspection of the drill shank shank dimension and chuck bushing prevents energy loss and premature wear on the internal anvil block.

Daily Maintenance Checklist for Tunnel Operators:

Check spark plug gap and clean carbon deposits every 8 operating hours.
Ensure the air filter is clean to prevent dust from entering the combustion chamber.
Inspect the rotation mechanism to guarantee smooth bit rotation during drilling.
Lubricate the front head and chuck assembly to minimize friction and heat buildup.