KJ321 Fully Hydraulic Tunneling Jumbo

KJ321 is dedicated two-boom drill jumbo for large-section tunnels and mines, covering extra-wide 12–45㎡ roadways. Dual symmetric 360° rotatable universal booms matched with auto-parallel feed beams eliminate operation blind zones, realizing simultaneous drilling of face blast holes and surrounding rock support bolt holes on single unit. Heavy-load 4×4 articulated 4WD chassis delivers stable climbing performance. Certified full mining Ex explosion-proof and IP65 dust & water proof with built-in water mist dust suppression system, suitable for large-section excavation of hard rock metal mines, long highway & railway tunnels and large underground water power plants. Modular design simplifies maintenance, full machine export and matched wear drill tools supply available.

Covers extra-large 12–45㎡ cross sections with wider height & width range than standard KJ311 series
Dual 360° full-range universal booms, auto self-leveling feed beam forms regular blast holes to reduce overbreak
Simultaneous blast & bolt support drilling, dual-purpose single machine shortens tunneling cycle
4×4 four-wheel drive articulated chassis, max 14° gradient, stable heavy load & flexible relocation
HC25 high-frequency stepped piston drifter delivers high hard rock penetration efficiency with low tool consumption
Open cabin with wide operator vision, integrated hydraulic valve bank for simple easy operation
Full machine mining explosion-proof + IP65 multi-layer sealing, long-term compliant operation in gas & heavy-dust underground
Built-in high-pressure water mist dust suppression for low-drill-dust underground working environment
Large-capacity dual independent hydraulic circuits maintain steady non-attenuated pressure during synchronous dual-boom drilling
Full modular split design for separate disassembly & maintenance of boom, travel and electric control parts