A Pneumatic Air Leg Rock Drill is one of the most widely used drilling tools in mining, tunneling, construction blasting, and geological exploration. With strong impact power, flexible operation, and high drilling efficiency, it has become the preferred handheld drilling equipment for medium-hard and hard rock formations. This article provides a complete overview, including working principles, features, applications, model selection, and maintenance tips - helping users and search engines better understand this essential tool.
What Is a Pneumatic Air Leg Rock Drill?
A Pneumatic Air Leg Rock Drill is a handheld rock drilling machine powered by compressed air. It combines a drill body with an extendable air leg (supporting jack), allowing operators to drill upward, downward, or inclined holes with minimal physical effort.
It is ideal for drilling blast holes with a diameter of 32–45 mm and depths of up to 5 meters, depending on rock hardness and drilling rods used.
Common alternative terms include:
Air Leg Jack Hammer
Pneumatic Rock Drilling Machine
Mining Air Leg Drill
Pneumatic Jackleg Drill
Using these synonyms helps enhance SEO keyword diversity while keeping the content natural.
Technical Data
|
Pneumatic Rock Drill With Air Leg |
|||||
|
Technical Parameters |
YT28 |
YT27 |
YT29A |
YT24C |
YT24 |
|
Weight(kg) |
26 |
27 |
26.5 |
24 |
24 |
|
Length(mm) |
661 |
668 |
659 |
628 |
678 |
|
Air Pressure(Mpa) |
0.4-0.63 |
0.4-0.63 |
0.4-0.63 |
0.4-0.63 |
0.4-0.63 |
|
Impact Rate(Hz) |
≧37 |
≧39 |
≧39 |
≧37 |
≧31 |
|
Air consumption(L/S) |
≦81 |
≦86 |
≦88 |
≦80 |
≦67 |
|
Impact Energy(J) |
≧70J |
≧75J |
≧78J |
≧65J |
≧65J |
|
Cylinder*Stroke(mm) |
80*60 |
80*60 |
82*60 |
76*60 |
70*70 |
|
Air Pipe Diameter(mm) |
25 |
19 |
25 |
25 |
19 |
|
Shank Dimension(mm) |
22*108 |
22*108 |
22*108 |
22*108 |
22*108 |
|
Drilling Depth(m) |
5 |
5 |
5 |
5 |
5 |
|
Bit Diameter(mm) |
34-42 |
34-45 |
34-45 |
34-42 |
34-42 |
How Does a Pneumatic Air Leg Rock Drill Work?
The machine operates through compressed air delivered from an air compressor.
The general process includes:
Compressed air enters the drill cylinder, driving the piston to reciprocate.
The piston impacts the shank (drill bit tail), generating strong impact force.
The drill rod rotates synchronously through a rotary sleeve.
The air leg provides thrust, keeping the bit tightly pressed into the rock.
Rock chips are flushed out by air and water, keeping the hole clean.
This mechanism allows continuous drilling with high penetration rates even in very hard rock layers.
Key Features of Pneumatic Air Leg Rock Drills
1. Strong Impact Energy
Delivers high-frequency blows, improving penetration rate in granite, basalt, quartzite, and other hard formations.
2. Flexible Operation with Air Leg
The telescopic air leg absorbs vibration, reduces operator fatigue, and supports overhead and inclined drilling.
3. High Reliability and Simple Maintenance
Fewer moving parts and mechanical simplicity ensure durability and low maintenance cost.
4. Suitable for Harsh Environments
Pneumatic systems are safe in high-temperature, dusty, or explosive environments where electric drills are unsafe.
5. Low Operating Cost
Compressed air is the only power source - energy efficient and easy to deploy at mining or construction sites.
Applications of Pneumatic Air Leg Rock Drills
A Pneumatic Air Leg Rock Drill is widely used in:
Underground mining
For blast hole drilling in metal mines and coal mines.
Tunnel construction
For anchor bolt holes and pre-splitting.
Road and railway engineering
Blasting holes for road cuts and slopes.
Hydropower and dam projects
Rock reinforcement holes and controlled blasting.
Geological exploration
For small-diameter exploration and sampling.
Its versatility makes it essential for rock engineering companies.
How to Choose the Right Air Leg Rock Drill Model
When selecting the right machine, consider the following:
✔ Rock hardness
Harder rocks need larger impact energy models.
✔ Drilling depth
Longer holes require stronger air legs and higher impact power.
✔ Working posture
Overhead drilling - choose lighter models
Horizontal drilling - choose medium-heavy models
✔ Air compressor matching
Typical requirement: 0.4–0.63 MPa, ≥2.5 m³/min airflow.
✔ Lubrication
Always use proper air-oil lubricators to protect internal components.
Maintenance Tips for Longer Service Life
To keep the drill running smoothly:
✔ 1. Ensure clean, dry compressed air
Moisture shortens piston life.
✔ 2. Lubricate daily
Use specialized air-oil lubricants.
✔ 3. Check drill rod and shank wear
Replace when deformation or cracking appears.
✔ 4. Clean internal parts regularly
Prevents carbon buildup and wear.
✔ 5. Use quality drill bits
High-quality alloy bits increase drilling speed significantly.
A Pneumatic Air Leg Rock Drill is an essential tool for mining, tunneling, and construction drilling tasks. Its high impact power, ease of use, and reliable performance make it a trusted choice for contractors worldwide. With proper maintenance and a suitable model selection, this machine delivers excellent drilling efficiency and long operating life.
You might also be interested in these machines：Hand Held Rock Drill ,Small Down The Hole Drilling,Mini Pneumatic Drill
Product Detail
- Brand Name: D miningwell
- Minimum Order Quantity: 1 set
- Packaging Details: Standard Export Packing
- Delivery Time:7-10 days
- Payment Terms:L/C, T/T, Western Union
Air rock drill is a rock drilling equipment with high impact energy, and lower air consumption. It is widely fitting for underground mine, railway traffic, water conservancy and so on.
Features
- 1). Strong impact energy
- 2). Energy saving and high efficiency
- 3). Wet drilling
- 4). Easy to operate
- 5). Low noise
- 6). Low vibration
- 7). Easy procurement of spare parts
- 8).Easy cleaning of air/water holes
Our Advantages
Extensive production experience: D Miningwell has been in the leading position of mining equipments with an experience of 20 years.
b. Complete production facilities: MININGWELL has its own drilling rig, DTH hammer, and drill pipe production workshops. Our technicians will do regular scheduled maintenance on these machines to guarantee them work well.
Quality Control:Miningwell has a complete QC process, to ensure that the production sequence of the product obeys the specifications, and the parts are not damaged. Every equipment and drilling tool from Miningwell will undergo a strict factory inspection. Loading safety inspection: To ensure the safety of the goods in the container.
One-Stop Procurement Service: From underground rock drilling to open-pit DTH rock drilling to deep well drilling, MININGWELL's supply chain covers all outstanding rock drilling products in China and can provide one-stop services for global rock drilling companies.
Best after-sale service: D Miningwell's principle is to provide customers with both the most working-efficient and cost-efficient drilling solutions. 22 overseas service stations guarantee your after-sales service.
Our History
Reform of shareholding cooperative system and establishment of Quxian Technology Mechanical Experiment Factory.
Moved to the Gaotang Road Science and Technology Park in Qujiang and became the first batch of high-tech manufacturers to settle in the high-tech park.
Changed the factory name to Quzhou Miningwell Machinery Factory to provide accessories for surrounding drilling rig factories.
Product pedigree and began market sales, expanding two production lines for drill pipes and DTH hammers.
Established Zhejiang Miningwell Supply Chain Management Co., Ltd and started the foreign trade journey.
Started independent research and development and production of HT series open-air DTH drill rigs.
Shipping&Payment
Our payment methods: credit card, L/C, T/T, Western Union, and we support shipping by air and by sea.
FAQ
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