Rock Straight System: Hard Rock Longwall Mining System for Low Seam Deposits

Overview
Miner - Typical Machine Length
22 ft
Conveyor System Length - Approximate
328 ft
Roof Support - Height Extended
85 in
  • Exterior View

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

Miner - Typical Machine Length
22 ft

Hard Rock Conveyor HRC30

Conveyor System Length - Approximate
328 ft

Hard Rock Roof Support HRS1220

Roof Support - Height Extended
85 in

Power

Total Installed Power - Approximate
938 mm H2O
Miner Haulage Speed
0-6 m/min (0-19.7 ft/min)

Roof Support System

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

Miner Machine Weight

Weight - Total
45 t

Seam Height

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

Conveyor System

Conveyor Capacity - Approximate
176 tonnes/hr
Note
100 m (328 ft) conveyor length/varies with rock density.

Dimensions (Approximate) - HRM220 Hard Rock Miner

Seam Range
1.3-2.0 m (4.2-6.6 ft)
Typical Machine Length
22 ft
Cutting Head Diameter
50 in
Installed Power Hydraulic System
74 mm H2O
Cutting Units
2
Installed Power per Cutting Unit
177 mm H2O
Installed Power Electrical System
428 mm H2O
Cutting Depth - Up To
4 in
Cutting Drum Speed
60 r/min
Body Height
47 in
Machine Weight - Approximate
45 t
Operating Voltage
1,000 V; 50 Hz; 3 AC

Dimensions (Approximate) - HRS1220 Hard Rock Roof Support

Height - Closed
42 in
Height - Extended
85 in
Canopy Width
63 in
Main Canopy Length
167 in
Swivel Canopy Length
59 in
Base Width
51 in
DA (Double Acting) Ram Stroke
25 in
Leg Centers Distance - Vertical to Face
1440/1660 mm (56.69 in/65.35 in)
Bearing Surface Base
38 ft²
Distance Roof Support Centers
69 in
Support Resistance (at Height 1600 mm/62.99 in) - Setting Load at 320 bar (4,641 psi)
320 psi
Support Resistance (at Height 1600 mm/62.99 in) - Yield Load at 415 bar (6,019 psi)
377 psi
Support Resistance (at Height 1600 mm/62.99 in) - Load at the End of Swivel Canopy
15 psi
Weight
10 t
Canopy Extension Length
59 in

Dimensions (Approximate) - HRC30 Hard Rock Conveyor

Line Pan Length
103 in
Line Pan Height
11 in
Chain Length - Up To
328 ft
Line Pan Width
69 in
Apron Plate Spacing
4 × 108 mm (4 × 4.25 in)
Apron Plate Chain Diameter
30 mm × 108 mm (1.18 in × 4.25 in)
Chain Speed
2 ft/min
Capacity per Hour
176 t

Rock Straight System

Rock Straight System

Rock Straight System

Rock Straight System

Rock Straight System

Hard Rock Miner HRM220

Hard Rock Miner HRM220

Hard Rock Miner HRM220

Hard Rock Miner HRM220

Hard Rock Miner HRM220

Hard Rock Miner HRM220

Hard Rock Miner HRM220

Hard Rock Roof Support HRS1220

Hard Rock Roof Support HRS1220

Hard Rock Roof Support HRS1220

Hard Rock Roof Support HRS1220

Hard Rock Roof Support HRS1220

Hard Rock Roof Support HRS1220

Hard Rock Roof Support HRS1220

Hard Rock Conveyor HRC30

Hard Rock Conveyor HRC30

Hard Rock Conveyor HRC30

Hard Rock Conveyor HRC30

Hard Rock Conveyor HRC30

Hard Rock Conveyor HRC30

Hard Rock Conveyor HRC30

Cutting Principle and Cutter Head

Cutting Principle and Cutter Head

Cutting Principle and Cutter Head

Cutting Principle and Cutter Head

Cutting Principle and Cutter Head

Cutting Principle and Cutter Head

Health and Safety

Health and Safety

Health and Safety

Health and Safety

Health and Safety

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