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- Boom coverage for 3m (10ft) wide tunnel x 4.2m (14ft) high
- Designed to tram in a 3.1m (10ft 3in) high tunnel
- Hydrostatic drive
- Electrical powered for tramming and drilling
- Hydraulics featuring variable displacement piston pumps
- TSRU rotary drifter (two-speed) for industrial minerals
OVERVIEW
The CB-8R hydraulic bolter drill, a single-boom hydraulic rig, is designed for drilling vertical and angled holes for bolting in underground production or development headings. The CB-8R features a side shift which allows the bolter to do a maximum drilling pattern of 1.2m (4ft).
The CB-8R includes the following features:
- Improved operator’s stand and compartment
- Improved guarding around operator
- Larger opening to operator’s compartment
- Increased bolt rack capacity
- New two-speed drill
- Hydraulic centralizer for drilling extended holes
- Expandable pins and bushing to reduce maintenance
- Drill guard
- Dust collector
- Auto shutdown
- Cable reel for 106m (350ft) of trailing cable
The CB-8R also includes robust drilling and carrier hydraulics that feature variable displacement piston pumps, specifically:
- Jumbo hydraulics: for drill rotation, feed, and boom movements
- General hydraulics: circuit design for optimal efficiency of steering and brakes
SPECIFICATIONS
TSRU (Two-Speed Rotation Unit)
| Technical Data | Wet | Dry | |
| Overall length | mm | 400 | 415 |
| Weight | kg | 68 | 70 |
| Rotation speed range | rpm | 240-750 | 240-750 |
| Oil supply | Lt/min | 40 | 40 |
| Normal drilling speed | rpm | 550 | 550 |
| Normal bolt tightening speed | rpm | 240 | 240 |
| Peak output torque (1) @ 22.5 MPa | Nm | 537 | 537 |
| Output torque (dynamic) (1) @ 19.0 MPa | Nm | 456 | 456 |
| Output torque (dynamic) (1) @ 14.0 MPa | Nm | 337 | 337 |
| Starting torque (static) (1) @ 19.0 MPa | Nm | 342 | 342 |
| Nominal water flow | Lt/min | 25 | — |
| Water pressure range | kPa | 700-1200 | — |
| Nominal air flow | Lt/sec | — | 20 |
| Nominal vacuum | kPa V | — | 55 |
TECHNOLOGY
TSRU Rotary drill
- Robust bearings for high feed side loads
- Compatible with existing feeds
- Maximum overhaul intervals
- Low surface speed for dynamic seals
- Automatic switching between high speed and high torque
- Non-handed design (one unit for all applications)
- 20% increase in drilling speed
- 25% increase in torque (above HDR40)
- 33% less installed hydraulic power
- Lowest maintenance costs
- Reliability
- Faster drilling speeds
- Lowest tool consumption
- Easiest to operate
- Highest penetration rates
- Lowest noise level