Robbins 91RH C: Raiseboring Machine - Atlas Copco Liberia

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Robbins 91RH C: Raiseboring Machine

George Apostolopoulos

+233 21 774512

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Large-size raise boring machines for holes ranging from 2.4 to 6.0 m (8-20 ft.) in diameter

The Robbins 91 and Robbins 123 rigs are powerful raise-boring rigs with a modular design for easy transport when weight or size limitations can be a serious concern. These rigs drill holes from 2.4 to 6.0 m (8-20 ft.) in diameter and can be relied on in a variety of applications. At Atlas Copco, we strive to construct high-quality machines that are easy to set up, operate and maintain – and our Robbins 91 and 123 rigs are no exception. These machines are built to serve and built to last.

Features & benefits

  • Power you can depend on The powerful 500-kW electric motor drives the reamer to penetrate the hardest rock.
  • Easy maintenance and transport The gear box is installed in a removable barrel, allowing the derrick to be split into smaller, more transportable components.
  • Steadfast and efficient Standard functions include anti-jamming, auto makeup and the gradual ramp-up of speed and torque.

Technical description

Technical data

Operational data - Derrick
Raise diameter, nominal4.5 m
Raise diameter, range2.4 - 5 m
Raise lenght, nominal600 m
Raise lenght maximum1000 m
Reaming thrust6700 kN
RPM, pilot0 - 58 rpm
RPM, reaming0 - 7 rpm
RPM, reaming (reduced torque)7 - 14 rpm
Bailing air (@ 7bar/100 psi)18 m³/min
Bailing, water600 l/min
Electrical power supply (50/60 Hz)580/650 / 778/872 HP
Electrical voltage (50/60 Hz)380-1000 V
Electrical frequency50 - 60 Hz
Electrical power requirement (50/60 Hz)706/791 kVA
Drill pipe diameter327 mm
Drill pipe length s/s1524 mm
Pilot hole diameter349 mm
Pilot hole optional diameter381 mm
Cooling water (at 25ºC / 77°F inlet temperature)160 l/min
Measurements & weights - Derrick
Height extend5100 mm
Height retracted4100 mm
Width piploader included3800 mm
Depth2700 mm
Weight32100 kg
Weight pipeloader included33700 kg
Drill angle (from horizontal)90-60 ºangle
Measurements & weights - Drive pack
Length3400 mm
Height1800 mm
Width1900 mm
Weight7100 kg
Measurements & weights - Thrust pack
Length2300 mm
Height1500 mm
Width1600 mm
Weight2800 kg
Maximum torque, reaming450 kNm
Maximum torque, break out 700 kNm
Stroke2160 mm
Width2300 mm
Traverse rate, fast traverse rate1.7 m/min
Traverse rate, feed rate0.3 m/min

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George Apostolopoulos

+233 21 774512

Send an email