General Description
RCJ300RC air RC drilling rig is engineered for high-efficiency performance under complex geological conditions. It supports drilling depths of up to 300 meters, with a final hole diameter adjustable between 130 mm and 350 mm. This makes it suitable for applications such as mineral exploration, mining operations, and building foundation construction.
The rig employs advanced reverse circulation technology, generating strong suction at the drill bit to rapidly transport cuttings through the drill pipe and out of the borehole. This effectively prevents the accumulation of cuttings, significantly enhancing drilling efficiency and ensuring high-quality boreholes compared to traditional direct circulation methods.
While the manufacturing cost of the RC rig is higher than that of conventional direct circulation rigs, its good cuttings removal capability can greatly shorten construction timelines and reduce overall project costs. However, the rig's more complex and precise structure requires skilled operators and more meticulous daily maintenance.
An emerging trend in drilling technology is the integration of both direct and reverse circulation systems, allowing automatic switching between modes based on formation changes during drilling. Intelligent control systems are also being adopted to enable remote monitoring and real-time fault diagnostics.
Rancheng Group offers tailored reverse circulation drilling solutions based on each customer's engineering needs, geological conditions, and budget constraints, ensuring optimal performance and cost-effectiveness across various working environments.
Technical Parameters
|
Model |
RCJ300RC air RC drilling rig |
|
|
Drill rig weight(crawler mounted) |
kg |
10000 |
|
Length × Width × Height (normal) |
mm |
6750×2300×3000 |
|
Ambient Temperature Range |
°C |
-10～38 |
|
Drill Ability |
||
|
Nominal Drill Depth |
m |
300 |
|
End-hole Diameter |
mm |
130-350 |
|
Drill angle |
° |
-10-90 |
|
Horizontal hole height |
m |
1.85-2.8 |
|
Drill head output |
||
|
Max Output Torque |
N.m |
10000 |
|
Output Rotation Speed) |
rpm |
55/ 110 |
|
Feeding |
mm |
3500 |
|
Thrust Force |
kN |
100 |
|
Lifting Capacity |
kN |
150 |
|
Oil Pump |
||
|
Output volume |
ml/r |
63+63+25 |
|
Winch |
||
|
Lifting force |
KN |
11 |
|
Hydraulic Oil |
||
|
Tank Capacity |
L |
220 |
|
Nominal Filtration Particle Size |
μm |
10 |
|
Engine(Cummins) |
6BTA5.9-C180 |
|
|
Power |
kW |
132 |
|
Rotary Speed (Max.) |
rpm |
2200 |
|
Track Chassis Base |
||
|
Walk Speed |
Km/h |
2 |
|
Unit Pressure |
MPa |
<0.05 |
|
Climb Ability |
° |
>30 |
Significant Advantage
1. 132kw Diesel engine-driving hydraulic system. Walk, Travel, rotate, feed, hoist, land, lift, compensate, unload are all by hydraulic components.
2. During rock drilling operation, RCJ300RC air RC drilling rig can work with down-the-hole hammer, and also reverse circulation hammer. Air compressor will provide wind to drive and slag. During operation, it can use regular dth hammer and ordinary drill pipe for direct drilling, or use the reverse circulation hammer and double-wall drill pipe (air inlet from the drill pipe interlayer and slag discharge from the inner pipe) for reverse circulation drilling.
3. If cutting or cones are used to make holes, mud can be used to discharge slag.
4. The working device is composed of feed mechanism, top drive rotary machine, sliding frame (mast), centering device, rod unloading mechanism, hoisting system, etc.
5. The RCJ300RC air RC drilling rig can be turned away from the drilling axis, which is convenient for the operation of the hoisting machine.
6. The cylinder plate chain propulsion is reliable and durable.
7. The thrust axis pressure, thrust speed and rotation speed are adjustable.
8. RCJ300RC air RC drilling rig adopts crawler type chassis which is easy to move. It is equipped with four high outriggers. When it is transported over long distances and is loaded by a car, it does not need to be lifted, and it can be directly mounted on the car, which is convenient for transportation.
9. The hydraulic oil will not produce high temperature when the rig is working continuously.
10. The mast can be fixed to the car body during operation, and there is a rear support rod to improve the stability of the mast operation.
Packaging & Shipping
Delivery time: 10-15days
We use professional equipment to frame the boxes. We will arrange specially-assigned person to inspect every step. Ensure transportation safety.
Certificate
Our products have passed CE certification and ISO9001 quality management system certification, ensuring that they meet international standards in terms of safety, reliability and quality.
How to Select Between a Positive Circulation Drilling Rig and a Reverse Circulation Drilling Rig?
-
Positive Circulation Drilling Rig - Soft Soil Layers (e.g., Clay, Silt)
- Positive circulation rigs are suitable for soft soil formations. Injected mud forms stable borehole pressure and develops a dense mud cake along the hole wall, effectively preventing soft soil from softening or collapsing when exposed to water.
- Typical applications: Shallow foundation piles for rural housing, shallow boreholes for municipal pipe network installations.
-
Positive Circulation Drilling Rig - Formations with Small Gravel (≤5 mm)
- In formations containing a small amount of gravel, the natural upward flow of drilling mud can easily carry fine drill cuttings out of the hole. This eliminates the need for strong suction equipment, making the system low-cost and easy to operate.
- Typical applications: Foundation treatments involving backfill soil layers with minor gravel content.
-
Reverse Circulation Drilling Rig - Hard Formations (e.g., Rock, Pebble, or Gravel Layers)
- Reverse circulation rigs perform best in hard or coarse formations. Driven by pump suction or air-lift power, the system creates strong upward force-4 to 5 times more powerful than positive circulation-allowing for efficient removal of large cuttings (up to 100 mm) and reducing the risk of stuck drilling tools.
- Typical applications: Bridge pile foundations, deep foundations for high-rise buildings.
-
Reverse Circulation Drilling Rig - Thick Sand Layers (Permeability Coefficient >10⁻³ cm/s)
- In permeable sandy formations, reverse circulation ensures rapid cuttings discharge, reducing mud retention time and preventing sedimentation or pressure imbalance that could lead to borehole collapse.
- Typical applications: Sandy regions such as the Yellow River Basin and coastal tidal flats.
⚠️ Selection Tips
When drilling in soft soil with reverse circulation, the strong suction may damage the protective mud layer on the borehole wall, increasing the risk of collapse.
When drilling in hard soil with positive circulation, cuttings may accumulate at the bottom of the borehole, accelerating drill bit wear and extending the construction period.
💡 Still unsure about the right rig for your project?
Contact us anytime for a professional, customized drilling solution tailored to your geological conditions, construction needs, and budget.
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