KJ421 Fully Hydraulic Tunneling Jumbo

Model: KJ421 Two-Boom Fully Hydraulic Tunneling Jumbo

Applicable Roadway Section: 16–68㎡ medium & large tunnels, underground powerhouses, deep stope

Boom System: Dual symmetric universal booms, 360° full rotation per boom, 360° rotatable auto self-leveling feed beam

Rock Drifter: 2 sets HC95LM high-frequency hydraulic drifters, 21kW single impact power

Drilling Range: Hole diameter 42–102mm, max economical drilling depth 4.8m

Travel System: 4×4 four-wheel drive articulated chassis, min turning radius ≤6.3m, max gradient 14°

Overall Dimension: L13000 × W2200 × H2400/3100 mm

Total Machine Weight: Approx. 22000 kg

Covers extra-large 16–68㎡ cross sections, ideal for large water powerhouses and extra-long tunnel excavation projects
Dual 360° long-stroke universal booms with 360° rotatable self-leveling feed beam forms neat blast holes to reduce overbreak
Dual 21kW high-power HC95LM drifters deliver efficient penetration on dense granite & basalt with low consumable loss
Dual-purpose simultaneous blast & bolt drilling shortens full tunneling construction cycle
4×4 articulated heavy-duty 4WD chassis with max 14° gradient, stable anti-slip travel under 22-ton full load
FOPS & ROPS falling-rock proof panoramic cabin with integrated hydraulic valve bank for easy operation
Official full machine mining Ex explosion-proof certification & multi-layer IP65 sealing for long-term compliant operation in gas & dusty roadways
Built-in high-pressure synchronous water mist dust suppression realizes low-dust underground work and extends drifter seal service life
Dual independent large-capacity hydraulic supply circuits maintain stable oil pressure during synchronous dual-boom drilling
Full modular split design for separate disassembly, maintenance and replacement of boom, travel and electric control units