Kaishan Underground Drilling Rigs/Underground Tunnelling (Development) Drilling Rigs
KJ421
KJ421 Full-hydraulic Tunnelling Drilling Rig features two symmetric flexible booms for vertical, inclined and horizontal blast holes and rock bolts, suitable for tunneling in cross-sections of 16-68m², with a total weight of about 22,000kg. It is equipped with 2×K40 booms (1,800mm extension) and 2×HC95LMH/22U rock drills (21-22KW impact power), drilling holes of Φ42-102mm, with 2×75kW electric motors.
Hole diameter
Φ42-102 mm
Overview
KJ421 Full-hydraulic Tunnelling Drilling Rig features two symmetric flexible booms for vertical, inclined and horizontal blast holes and rock bolts, suitable for tunneling in cross-sections of 16-68m², with a total weight of about 22,000kg. It is equipped with 2×K40 booms (1,800mm extension) and 2×HC95LMH/22U rock drills (21-22KW impact power), drilling holes of Φ42-102mm, with 2×75kW electric motors.
Key highlights
- ✓Dual booms without blind spots: two symmetric rectangular-coordinate flexible booms, no operation blind spots, working range 4×4-8.7×7.8m
- ✓High-frequency rock drill: 2×HC95LMH/22U, 21-22KW impact power, stepped piston optimizing impact wave transmission for higher drilling speed and lower tool consumption
- ✓Large hole diameter: Φ42-102mm, K40 booms with 1,800mm extension, 360° beam rotation and 1,600mm compensation stroke
- ✓Powerful chassis: Cummins B3.9CS4-130C (96KW) diesel engine, torque converter + gearbox transmission, four-wheel-drive articulated chassis, travel speed 10km/h, max climbing capacity 25% (14°)
- ✓Safety and comfort: FOPS & ROPS certified canopy with optional enclosed cab; 2×75kW electric motors, 400L hydraulic oil tank, 10μ filtration
Applications: Blast hole and rock bolt drilling in large-section underground mines and tunnel excavation.
Genuine Kaishan equipment supplied through our authorized distribution channel, with configuration, export coordination, spare-parts and after-sales support.
Specifications
Request the current specification sheet for this model using the button above.
Drilling capability
| Hole diameter (mm) | Φ42-102 |
| Tunnel working range | 16-68 m² section |
Engine & drive
| Chassis engine | Cummins B3.9CS4-130C 96KW/2500rpm |
| Impact power | 21KW / 22KW |
| Frequency | 62Hz / 53Hz |
| Motor power | 2×75kW |
| Voltage | 380V 50Hz |
Drive & handling
| Feed beam tilt | 360° |
| Mast compensation length (mm) | 1600 |
| Boom model | K40 |
| Boom extension | 1800mm |
Mud & hydraulic
| Fuel tank (L) | 120 |
| Filtration precision | 10μ |
| Hydraulic oil (L) | 400 |
Tooling & air
| Rock drill | 2×HC95LMH / 22U |
Performance & mobility
| Travel speed | 10km/h |
| Gradeability | 25%(14°) |
Other specifications
| Noise | <100dB(A) |
Applications
- Underground mining
- Development drilling
- Tunnel face drilling
Recommended packages
Air compressor match
Underground jumbos run on the mine's electric/hydraulic supply — confirm voltage and water/air services at the heading. Where air is needed, match a KSDY electric compressor to the site power.
DTH hammer & bits
Kaishan underground rigs use premium hydraulic rock drills (Montabert HC50/HC95/HC109) for face and production drilling; the KSQ31 DTH model runs K-class hammers. Confirm rock drill model against your tunnel section.
Need a complete drilling package? Request a rig + compressor + tooling quote →
Frequently asked questions
What applications suit the KJ421?
Underground mining, Development drilling, Tunnel face drilling.
Which air compressor pairs with the KJ421?
Underground jumbos run on the mine's electric/hydraulic supply — confirm voltage and water/air services at the heading. Where air is needed, match a KSDY electric compressor to the site power.
Can the equipment be configured to my project?
Send your project details through the inquiry form and we will confirm the available configuration for the selected model before quotation.