Blasthole drilling rig ZR122

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Overview
Engineered for demanding blasthole drilling operations, the Komatsu ZR122 rotary drill delivers high bit loading, substantial rotary capability and structural durability to support productive, low cost-per-meter drilling. The machine combines a boxed (boxer-style) mast, a high-force rack-and-pinion pulldown and automated systems to optimise hole quality, placement accuracy and operational uptime.

Key advantages

• Robust boxer-style mast: enclosed-section mast improves structural reliability and simplifies inspection and maintenance.
• High-force rack-and-pinion pulldown: provides 122,000 lb bit loading and substantial rotary force to penetrate hard rock.
• Automated bit carousel: advanced auto-bit changer reduces changeover time and operator exposure while keeping hole integrity consistent.
• High-Precision GPS (HPGPS): accurate hole placement for improved blasting outcomes and downstream efficiency.
• Configurable, application-ready design: flexible setup options to adapt to site-specific drilling patterns and lower total drilling costs.

Features and benefits (selected)

• Solid boxer-style mast construction: reduces stress raisers and crack initiation points, easing inspection and repair.
• Innovative rack-and-pinion pulldown: maximises drilling forces while promoting system reliability and reduced maintenance intervals.
• Auto-bit and pipe handling: carousel-based handling streamlines bit changes and enables rapid diameter changes to optimise fragmentation.
• Enhanced structural design: mast, main and front frames engineered for durability; front frame configurable for add-ons or power-supply options.
• Auto-navigation with HPGPS: supports precise drill movement between holes and enables unmanned movements when required.
• Single and multi-pass angle drilling: versatile mast configurations for a range of applications using the same platform.

Drill steel and components
Komatsu blasthole drill steel (fabricated and integral) is matched to drills with OD diameters from 7" to 13 3/4". Fabricated drill steel uses alloy-steel tool joints with ultrasonic inspection. Wrench slots or flats are milled to suit wrench requirements. Rotary-shouldered connections are kemplated to protect against galling during break-in. Heavy-wall construction and optional tungsten hard facing improve life and lower operating cost.

• Integral drill steel manufactured from premium alloy-bar stock.
• Bores trepanned to size for correct balance in selected rotary-shouldered connections.
• Concentricity and axial alignment of connections held to close tolerance.
• Tungsten hard facing available for abrasion and erosion protection.
• Komatsu supplies matching bit subs and saver/top subs to connect drill pipe to shock subs.

Resources (available documents)

• ZR122 Spec Sheet (English)
• ZR122 Sell Sheet (English)
• Boxer mast and rack-and-pinion sell sheet (one-pager)
• Press release: newest blasthole drill provides high productivity

Technical specifications

• Model / SKU: ZR122
• Category: Blasthole drills — Rotary drill
• Hole diameter (in): 13 3/4
• Hole diameter (mm): 349
• Bit loading (kg): 55,338
• Bit loading (lbs): 122,000
• Single pass hole depth (ft): 65
• Single pass hole depth (m): 20