Rock Straight System

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Overview

The Cat® Rock Straight System is a fully mechanized longwall system adopted to hard rock conditions for continuous mining of low seam hard rock deposits. The Rock Straight System combines the use of a hard rock shearer (Hard Rock Miner HRM220), a hard rock chain conveyor (Hard Rock Conveyor HRC30) and hydraulic roof support (Hard Rock Roof Support HRS1220). It features the unique adaptation of Caterpillar “Activated Undercutting Technology” and has been specifically designed for the extraction of bedded hard rock deposits (e.g. platinum, copper, gold). The Rock Straight System provides economical cutting in the mining of thin seams and narrow veins, especially when selective mining of ore is required.

Hard Rock Miner HRM220

Units:
Miner – Typical Machine Length 22.3 ft 6.8 m Less

Hard Rock Conveyor HRC30

Conveyor System Length (approximate) 328.0 ft 100.0 m Less

Hard Rock Roof Support HRS1220

Roof Support – Height Extended 84.64 in 2150.0 mm Less

Power

Total Installed Power (approximate) 938.0 hp 700.0 kW Less
Miner Haulage Speed 0-6 m/min (0-19.7 ft/min) 0-6 m/min (0-19.7 ft/min) Less

Roof Support System

Support Resistance 320.38 psi 2209.0 kN Less
Note At height of 1600 mm (62.99 in) and setting load at 320 bar (4,641 psi). At height of 1600 mm (62.99 in) and setting load at 320 bar (4,641 psi). Less

Miner Machine Weight

Weight (total) 45.2 tons 41.0 tonnes Less

Seam Height

Minimum to Maximum Cut 1.3 to 2.0 m (4.2 to 6.6 ft) 1.3 to 2.0 m (4.2 to 6.6 ft) Less

Conveyor System

Conveyor capacity (approximate) 176.0 tons/hr 160.0 tonnes/hr Less
Note 100 m (328 ft) conveyor length/varies with rock density. 100 m (328 ft) conveyor length/varies with rock density. Less

Dimensions (Approximate) – HRM220 Hard Rock Miner

Seam Range 1.3-2.0 m (4.2-6.6 ft) 1.3-2.0 m (4.2-6.6 ft) Less
Typical Machine Length 22.3 ft 6.8 m Less
Cutting Head Diameter 50.0 in 1270.0 mm Less
Installed Power Hydraulic System 73.7 hp 55.0 kW Less
Cutting Units 2 2 Less
Installed Power per Cutting Unit 177.0 hp 132.0 kW Less
Installed Power Electrical System 427.6 hp 319.0 kW Less
Cutting Depth (up to) 3.9 in 100.0 mm Less
Cutting Drum Speed 60.0 rpm 60.0 rpm Less
Body Height 47.2 in 1200.0 mm Less
Machine Weight (approximate) 45.2 tons 41.0 tonnes Less
Operating Voltage 1,000 V; 50 Hz; 3 AC 1,000 V; 50 Hz; 3 AC Less

Dimensions (Approximate) – HRS1220 Hard Rock Roof Support

Height Closed 41.73 in 1060.0 mm Less
Height Extended 84.64 in 2150.0 mm Less
Canopy Width 62.99 in 1600.0 mm Less
Main Canopy Length 166.93 in 4240.0 mm Less
Swivel Canopy Length 59.05 in 1500.0 mm Less
Base Width 51.18 in 1300.0 mm Less
DA (double-acting) Ram Stroke 24.6 in 625.0 mm Less
Leg Centers Distance (vertical to face) 1440/1660 mm (56.69 in/65.35 in) 1440/1660 mm (56.69 in/65.35 in) Less
Bearing Surface Base 38.061 ft2 35360.0 cm2 Less
Distance Roof Support Centers 69.29 in 1760.0 mm Less
Support Resistance (at height 1600 mm/62.99 in) – Setting Load at 320 bar (4,641 psi) 320.38 psi 2209.0 kN Less
Support Resistance (at height 1600 mm/62.99 in) – Yield load at 415 bar (6,019 psi) 376.95 psi 2599.0 kN Less
Support Resistance (at height 1600 mm/62.99 in) – Load at the end of swivel canopy 14.5 psi 100.0 kN Less
Weight 10.25 tons 9.3 tonnes Less
Canopy Extension Length 59.05 in 1500.0 mm Less

Dimensions (Approximate) – HRC30 Hard Rock Conveyor

Line Pan Length 102.95 in 2615.0 mm Less
Line Pan Height 11.02 in 280.0 mm Less
Chain Length (up to) 328.0 ft 100.0 m Less
Line Pan Width 69.13 in 1756.0 mm Less
Apron Plate Spacing 4 × 108 mm (4 × 4.25 in) 4 × 108 mm (4 × 4.25 in) Less
Apron Plate Chain Diameter 30 mm × 108 mm (1.18 in × 4.25 in) 30 mm × 108 mm (1.18 in × 4.25 in) Less
Chain Speed 2.3 ft/min 0.7 m/sec Less
Capacity per Hour 176.0 tons 160.0 tonnes Less

Rock Straight System

Continuous cutting, loading and hauling in hard rock mining


Hard Rock Miner HRM220

Continuous cutting operation in low seam heights


Hard Rock Roof Support HRS1220

Protection against roof falls


Hard Rock Conveyor HRC30

Flat and sturdy to suit low seam heights


Cutting Principle and Cutter Head

Activated undercutting maximizes productivity


Health and Safety

Designed for increased safety and performance