📦 Underground Mining Drilling Rigs
Kaishan KJ421 Underground Drill Rig
Model: KJ421
The Kaishan KJ421 is a compact underground drill rig engineered for efficient drilling in confined tunnels and mining headings. As a dedicated underground drilling rig, it combines a robust boom system, powerful hydraulic rock drill, and reliable diesel engine to deliver consistent performance in hard rock conditions. With a drilling depth of up to 30 meters and hole diameter range of 45–102 mm, the KJ421 excels in underground development, tunneling, and mining support operations. Its articulated chassis and four-wheel drive ensure stable maneuverability on rough terrain, while the ergonomic control panel simplifies operation and reduces operator fatigue. Designed for productivity and safety, the KJ421 integrates advanced hydraulic controls and efficient dust suppression. Whether you are drilling blast holes, anchor holes, or exploration holes, the Kaishan KJ421 provides a cost-effective, durable solution for underground drilling projects worldwide.
Best For
Technical Specifications
| Model | Kaishan KJ421 |
| Impact Pressure | 180-200bar |
| Engine | Cummins QSB3.9-C125 |
| Drilling Method | Hydraulic percussion |
| Engine Power | 93 kW |
| Weight | 22,000 kg |
| Dimension (L×W×H) | 13000 × 2,200 × 2,400 mm |
Product Details
Technical Selection
Key parameters for matching this machine to your job. Send us your hole diameter, depth and rock condition and our engineers will confirm the right configuration.
Impact Pressure
180-200bar
Engine Power
93 kW
Weight
22,000 kg
Dimension (L×W×H)
13000 × 2,200 × 2,400 mm
Not sure this model fits? Tell us the hole diameter and depth — we will confirm the matching rig, compressor and hammer.
Check with an engineerKey Advantages
Powerful hydraulic rock drill for fast penetration in hard rock
Articulated boom and telescopic feed for precise hole positioning
Four-wheel drive articulated chassis for excellent maneuverability
Ergonomic control panel with joystick operation for reduced fatigue
Integrated dust suppression system for a safer working environment
Reliable diesel engine delivering high torque and fuel efficiency
Applications
📍 Underground Mining Development
Drilling blast holes and anchor holes in narrow veins and development headings.
Solution: The KJ421's compact size and articulated boom allow efficient drilling in confined spaces, improving cycle times and reducing dilution.
📍 Tunnel Excavation
Drilling blast holes for tunnel advance in civil engineering and hydropower projects.
Solution: With a drilling depth of up to 30 meters and hole diameter range of 45–102 mm, the KJ421 ensures accurate hole placement and fast advance rates.
📍 Rock Bolting and Ground Support
Installing rock bolts and cable bolts for ground reinforcement in underground mines.
Solution: The rig's precise boom control and powerful rock drill enable quick and reliable bolt hole drilling, enhancing safety and stability.
📍 Exploration Drilling
Drilling exploratory holes for geological assessment and resource definition.
Solution: The KJ421 can be equipped with various drilling tools to obtain core samples or perform percussion drilling, providing valuable geological data.
KJ Series Models
Compare specifications across the series to find the right model.
| ☑ | Model | Model | Impact Pressure | Engine | Drilling Method | Engine Power | Inquire |
|---|---|---|---|---|---|---|---|
| KJ421This model | Kaishan KJ421 | 180-200bar★ | Cummins QSB3.9-C125 | Hydraulic percussion | 93 kW | Get a Quote | |
| KJ422 | Kaishan KJ422 | 180-200bar | Cummins qsb5.9-c160 | DTH / Rotary | — | Get a Quote | |
| KJ210 | Kaishan KJ210 | 150bar | Cummins | Hydraulic top hammer drilling | 45 kW diesel (optional electric motor) | Get a Quote | |
| KAISHAN KJ310 | Kaishan KJ310 | 130bar | — | Rotary / DTH | 45 kW | Get a Quote | |
| KAISHAN KJ311 | Kaishan KJ311 | 130BAR | — | Hydraulic percussion + rotation | 93 kW | Get a Quote | |
| KAISHAN KJ311D | Kaishan KJ311 | 130bar | — | Top Hammer / DTH | 45 kW | Get a Quote | |
| KJ211 | Kaishan KJ211 | 130bar | 1.5KW | Hydraulic Top Hammer | 45 kW | Get a Quote |
Compare 2–3 models? Tick the boxes and send them together — we will quote each one for you.
Tip: select multiple models and click “Inquire All” — the selected models are added to the quote form automatically, so you get a faster quotation.
Not sure which model fits your project? Send us your working pressure and air demand — our engineers will recommend the right one.
Main Components
- Hydraulic rock drill
- Articulated boom
- Telescopic feed beam
- Control panel
- Diesel engine
- Undercarriage with four-wheel drive
- Dust suppression system
- Drill string (rods and bits)
Working Principle
The Kaishan KJ421 underground drill rig operates on a hydraulic percussion principle. A diesel engine drives the hydraulic system, which powers the hydraulic rock drill. The rock drill converts hydraulic energy into impact energy, delivering high-frequency blows to the drill string. Simultaneously, the rotation unit turns the drill string, while the feed system applies thrust to keep the bit in contact with the rock. The impact energy travels through the drill rods to the bit, fracturing the rock. Flushing water or air removes cuttings from the hole. The articulated boom and feed beam allow precise positioning of the drill bit. The operator controls all functions via a joystick panel, ensuring efficient and accurate drilling. This method is highly effective in hard rock and provides fast penetration rates with good hole quality.
Detailed Features
- ▸High-frequency hydraulic rock drill for rapid penetration
- ▸Articulated boom for wide coverage and precise positioning
- ▸Telescopic feed beam for efficient drilling
- ▸Four-wheel drive articulated chassis for superior mobility
- ▸Ergonomic joystick controls for reduced operator fatigue
- ▸Integrated dust suppression system for safety
- ▸Robust construction for long service life
- ▸Easy maintenance access for reduced downtime
Packaging & Shipping
The Kaishan KJ421 is shipped in a disassembled state for efficient transport. The main components are securely packed in wooden crates and steel frames, protected against moisture and corrosion. Standard export packaging is suitable for sea freight. The rig can be loaded into a 40-foot container or flat rack. Delivery time is typically 30–45 days after order confirmation. Ports of shipment include Shanghai, Qingdao, or as per customer request.
After-Sales Service
Kaishan offers comprehensive after-sales service for the KJ421. The rig comes with a 12-month warranty or 2000 working hours, whichever comes first. A 24-hour technical support hotline is available for troubleshooting. We provide on-site installation and commissioning, as well as operator training. Genuine spare parts are available globally through our distribution network. Regular maintenance kits and service contracts are offered to ensure optimal performance and extended equipment life.
Frequently Asked Questions
What hole diameter and drilling depth can the Kaishan KJ421 achieve?+
The Kaishan KJ421 drills holes from 45–102 mm in diameter to a depth of up to 30 meters. It uses hydraulic percussion drilling for blast holes, anchor holes, and grouting holes in hard rock. This size range suits underground development and tunneling headings.
What engine powers the Kaishan KJ421?+
The Kaishan KJ421 is powered by a Cummins QSB3.9-C125 engine rated at 93 kW. The diesel engine delivers high torque and fuel efficiency for underground drilling. It drives the hydraulic percussion system and the four-wheel drive articulated chassis.
What impact pressure does the KJ421 hydraulic rock drill require?+
The Kaishan KJ421 operates at an impact pressure of 180–200 bar. This hydraulic percussion system drives the high-frequency rock drill for fast penetration in hard rock. The pressure range supports consistent drilling in confined tunnels and mining headings.
Where can the Kaishan KJ421 be used?+
The Kaishan KJ421 is built for underground mining development, tunnel excavation, rock bolting and ground support, and exploration drilling. Its four-wheel drive articulated chassis provides stable maneuverability on rough terrain. The rig weighs 22,000 kg and measures 13000 × 2,200 × 2,400 mm.
How is the Kaishan KJ421 shipped?+
The Kaishan KJ421 is shipped disassembled for efficient transport, with main components packed in wooden crates and steel frames. Standard export packaging protects against moisture and corrosion and suits sea freight. The rig can be loaded into a 40-foot container or flat rack, with delivery typically 30–45 days after order confirmation.
What warranty and after-sales support come with the KJ421?+
The Kaishan KJ421 includes a 12-month warranty or 2000 working hours, whichever comes first. A 24-hour technical support hotline is available, along with on-site installation, commissioning, and operator training. Genuine spare parts are available globally through the distribution network.
What controls and safety features does the KJ421 have?+
The Kaishan KJ421 uses an ergonomic control panel with joystick operation to reduce operator fatigue. An integrated dust suppression system supports a safer working environment. The articulated boom and telescopic feed beam allow precise hole positioning without repositioning the carrier.
Related Insights
Related Projects
Where This Machine Is Used
Is This Rig Right for My Project?
Answer seven questions about your hole, depth and rock — get a matched rig, compressor, hammer, bit and rod.
Need Technical Support?
Request information and get a quote from our engineers.
Recommended System
Rig + air compressor + drilling tools matched to your project. Get pre-matching advice from our engineers.
Recommended Equipment Configuration
Matched from real machine parameters — rig, compressor, hammer, bit and rod working as one system.
KJ421
- Hole range
- 42–102 mm
Why matched
Parameter-matched to the machine on this page.
KSCY-175/8
- Working pressure
- 8 bar
- Air flow
- 5 m³/min
Why matched
Covers the required 8 bar / 1.55 m³/min air demand (rated 8 bar / 5 m³/min).
L2
- Hole range
- 68–88
- Air flow
- 5–5 m³/min
- Working pressure
- 5+ bar
- Bit shank
- L2.5** / DIR80
Why matched
Hole range 68–88 mm covers your requirement 42–102 mm.
R32
- Hole range
- 76–102
- Pressure class
- 高风压 (High pressure)
Why matched
Hole range 76–102 mm covers your requirement 42–102 mm.
System requirement: 8 bar / 1.55 m³/min · 42–102 mm
