The sturdy and reliable universal boom features an optimal cross-sectional coverage shape. The propulsion beam can rotate 360° and automatically level, making drill positioning quick and convenient. The boom can also be used for lateral stone door opening and anchor drilling operations. The drilling rig layout ensures good operator visibility. With a balanced design, the powerful four-wheel-drive articulated chassis ensures flexible, fast, and safe movement in narrow roadways. The high-frequency impact drill uses a staged piston to optimize impact wave transmission efficiency, increasing drilling speed, reducing tool wear, and improving equipment reliability. The spacious working area and a range of automatic features help the operator focus on drilling safely, quickly, and accurately. All maintenance points are well-protected yet easy to service.
Quzhou Mazellion Heavy Industry Technology Co., Ltd. is a professional manufacturer of diesel screw air compressors and mining drilling equipment, serving global mining, quarry, water well drilling, and construction projects. We provide factory-direct supply, stable quality, and full OEM customization to help customers win local markets with better cost performance and reliability.
To start cooperation: send your inquiry → get a tailored technical solution & quotation → confirm order → production & testing → fast shipment → long-term spare parts & technical support. We respond quickly and support you throughout the whole project.
Drilling Rig Specification Table
Dimensions and Weight
| Parameter | Specification |
| Length | 13000 mm |
| Width | 2200 mm |
| Height | 2400 / 3100 mm |
| Weight | Approx. 22000 kg |
| Tramming speed on flat ground | 10 km/h |
| Maximum climbing capacity | 25% (14°) |
Safety Protection
| Parameter | Specification |
| Noise level | < 100 dB(A) |
| Lifting safety roof | FOPS & ROPS certified |
Air & Water System
| Parameter | Specification |
| Air compressor | DLGF 1.5/8-11(B) |
| Capacity of air compressor | 1.55 m³/min |
| Pressure | 8 bar |
| Device of shank lubrication | Electronic pulse lubrication pump |
| Air consumption of lubrication | 2 × 0.3 m³/min |
| Oil consumption of lubrication | 2 × 180-250 g/h |
| Power of water pump | 7.5 kW |
| Capacity of water pump | 10 m³/h |
Chassis
| Parameter | Specification |
| Diesel engine | Cummins B3.9CS4-130C, 96 kW / 2500 rpm |
| Drive system | Hydraulic torque converter + gearbox |
| Travelling braking | Wet bridge brake |
| Parking braking | Mechanical brake |
| Fuel tank | 120 L |
Drilling System
| Parameter | Specification |
| Rock drill | 2 × HC95LMH / RD22U |
| Rod size | R38 / T38 |
| Impact power | 21 kW / 22 kW |
| Impact frequency | 62 Hz / 53 Hz |
| Hole diameter | Ø42-102 mm |
| Beam rotation | 360° |
| Feed extension | 1600 mm |
| Model of drill boom | K40 |
| Form of drill boom | Self-leveling |
| Boom extension | 1800 mm |
Electric Hydraulic Power Unit
| Parameter | Specification |
| Motor | 2 × 75 kW |
| Pump Type | Axial variable displacement piston pump |
| Rotation | Gear pump |
| Filter fineness | 10 μ |
| Hydraulic oil tank | 400 L |
| Hydraulic cooler | Water cooler |
| Working voltage | 380 V |
| Frequency | 50 Hz |
| Starting method | Star-triangle |
| Cable specifications | 3 × 120 + 3G25 |
1. Large-Scale Underground Metal Mining
Designed for high-productivity development in large underground gold, copper, iron ore, zinc, lead, and nickel mines. The dual-boom system enables simultaneous drilling operations, significantly improving tunnel advance rates and overall mining efficiency.
2. Large Cross-Section Drift Development
Ideal for haulage drifts, transportation tunnels, ventilation drifts, and service galleries with medium to large cross-sections. The extensive boom coverage allows complete face drilling with fewer repositioning operations.
3. Railway and Highway Tunnel Construction
Suitable for drill-and-blast excavation in railway tunnels, highway tunnels, and underground transportation projects. The hydraulic drilling system delivers accurate hole placement and consistent drilling performance in hard rock conditions.
4. Hydropower and Underground Cavern Projects
Widely used in hydropower stations, underground powerhouse caverns, water diversion tunnels, surge chambers, and other large-scale underground infrastructure projects requiring efficient face drilling and controlled blasting.
5. High-Speed Mine Development Projects
The dual-boom design allows simultaneous drilling of cut holes, stoping holes, and perimeter holes, making the KJ421 an excellent solution for mines seeking faster development cycles and increased production capacity.
6. Underground Infrastructure and Civil Engineering
Applicable to metro tunnels, utility tunnels, underground storage facilities, defense projects, and other underground construction works where reliable drilling performance, precise hole alignment, and high operational efficiency are essential.
Promote 360° beam rotation and automatic leveling
Powerful four-wheel drive articulated chassis
Spacious working area with good visibility
Q1:What spare parts support do you provide?
We maintain spare parts inventory for: Hydraulic rock drills, Hydraulic pumps, Feed beams, Hydraulic cylinders, Electrical components, Sealing kits, Filters. Critical spare parts can normally be shipped within 3–7 working days.
Q2: Which payment term can you accept?
30% T/T in advanced, 70% T/T against the B/L copy.
Q3:What is the typical production and delivery time for the KJ421 drill rig?
For a standard configuration, the production lead time is typically between 45 and 60 days after receipt of the deposit. Delivery schedules may vary depending on the quantity ordered and any customization requirements. Large project orders can be arranged according to the customer's construction schedule.
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