Kaishan Surface Drilling Rigs/Mid-size Crawler DTH Drill Rig Series
KG420B
KG420B is Kaishan's surface DTH drilling rig, an improved model brought in line with national diesel-engine emission regulations. It uses a Yuchai four-cylinder engine, a folding frame track with four-wheel drive, track leveling cylinders and a plunger-piston tramming motor, an enlarged lifting oil cylinder and chain, and a thickened profile housing. KG420BH is the same rig equipped with a dust collector.
Model of drill rig
KG420B
Dimensions & weight — Weight of complete machine
4150 kg
Dimensions & weight — Overall dimensions (L × W × H)
5500 x 2250 x 2350 mm
Drilling capability — Drilling hardness
f = 6-20
Overview
KG420B is Kaishan's surface DTH drilling rig, an improved model brought in line with national diesel-engine emission regulations. It uses a Yuchai four-cylinder engine, a folding frame track with four-wheel drive, track leveling cylinders and a plunger-piston tramming motor, an enlarged lifting oil cylinder and chain, and a thickened profile housing. KG420BH is the same rig equipped with a dust collector.
Key highlights
- ✓Yuchai four-cylinder diesel engine meeting national emission and environmental standards.
- ✓Folding frame track with four-wheel drive for rough ground and quick relocation.
- ✓Track leveling cylinders and a plunger-piston tramming motor raise working pressure and increase rotary torque and revolving speed.
- ✓Enlarged lifting oil cylinder and chain increase lifting force and reliability.
- ✓Thickened profile folded housing raises structural strength and rigidity.
- ✓Additional lifting ring makes handling and lifting convenient.
- ✓Dust-collector version KG420BH adds a dust collector for more environmentally friendly, more reliable operation.
Applications: Surface down-the-hole (DTH) drilling of holes from Φ90 mm to 130 mm. · Rock of hardness f = 6-20, at an economical drilling depth of 25 m. · Sites that pair the rig with a portable air compressor: selection depends on hole diameter and air-hose length, and the catalog recommends KSCY550-13, KSCY570/12-550/15 or LGCY17/18-18/15T.
Specifications
Request the current specification sheet for this model using the button above.
Other specifications
| Model of drill rig | KG420B |
Dimensions & weight
| Weight of complete machine | 4150 kg |
| Overall dimensions (L × W × H) | 5500 x 2250 x 2350 mm |
Drilling capability
| Drilling hardness | f = 6-20 |
| Drilling diameter | Φ90-130 mm |
| Depth of economical drilling | 25 m |
| Rotary speed | 0-140 rpm |
| Rotary torque (max) | 2000 N·m |
| Lifting force | 25 kN |
| Method of feed | Cylinder and leaf chain |
| Feed stroke | 3780 mm |
| Travelling speed | 0-2.5 km/h |
| Climbing capacity | ≤30° |
| Ground clearance | 280 mm |
| Tilt angle of beam | down 135°, up 50°, total 185° |
| Swing angle of beam | left 100°, right 45°, total 145° |
| Pitch angle of drill boom | down 50°, up 25°, total 75° |
| Swing angle of drill boom | left 44°, right 45°, total 89° |
| Leveling angle of track | ±10° |
| Compensation length of beam | 900 mm |
Engine & drive
| Supporting power | Yuchai YC4DK80-T302, 58 kW / 2200 r/min |
| DTH hammer | 3 in, 4 in |
| Drilling rod | Φ64 x 3 m or Φ76 x 3 m |
| Air consumption | 10-17 m³/min |
| Maximum height of horizontal hole | 2750 mm |
| Minimum height of horizontal hole | 350 mm |
| Dust collector (standard configuration) | QZA-90, 8 filter elements |
| Dust collector (alternative configuration) | QZA-120, 12 filter elements |
Applications
- Open-pit mining
- Bench blasting
- Production drilling
Recommended packages
Air compressor match
This rig draws 10-17 m³/min at the hammer (3" or 4"). The standard pairing is a KSCY mobile compressor in the 18-21 m³/min class — e.g. KSCY-310/22 (21 m³/min @ 2.2 MPa) or KSCY-650/20-700/17T (18-19 m³/min dual-mode).
DTH hammer & bits
3" and 4" DTH hammers cover the Φ90-130 mm range — K3/K30C class for 90-105 mm holes, moving up a size for 130 mm holes. Matching button bits order as a set.
Need a complete drilling package? Request a rig + compressor + tooling quote →
Frequently asked questions
What applications suit the KG420B?
Open-pit mining, Bench blasting, Production drilling.
Which air compressor pairs with the KG420B?
This rig draws 10-17 m³/min at the hammer (3" or 4"). The standard pairing is a KSCY mobile compressor in the 18-21 m³/min class — e.g. KSCY-310/22 (21 m³/min @ 2.2 MPa) or KSCY-650/20-700/17T (18-19 m³/min dual-mode).
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.
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Guides that reference the KG420B by model name.