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LATEST TECHNOLOGICAL DEVELOPMENTS IN UNDERGROUND MINING
By,Rajat Sahu
109MN0586
Mail: [email protected]
CONTENTS: Double ended ranging drum shearer
(Longwall Mining) Continuous Miner/Road Headers Mechanised Roof Bolter hydraulic face drilling rig Environmental Telemonitoring systems. IN-PIT CRUSHING AND CONVEYING
DOUBLE ENDED RANGING DRUM SHEARER
A double ended ranging drum shearer is provided with a shearer body and a pair of drums disposed at front and rear end portions of the shearer body to be movable up- and down-wardly.
Tech-Features:
Electric Motor: 2X375 or 2X500 kW
Voltage: Up to 1200 Volts
Cutting Drum Dia: 1168 to 1600mm
Drum Speed: 23 to 54rpm
Dust Supression: Water Spray type
Range of Workng Thickness: 0.5 to 5m
Cutting Speed: 2.4 to 6 m/min
ADVANTAGES: High Productivity: OMS upto 40 High production High Rate of Advance Continuous production Low labor requirement High recovery (60% average) Good Accident Record
CONTINUOUS MINER/ROAD HEADERS A roadheader, also called a boom-type roadheader, road header
machine, road header or just header machine, is a piece of excavating equipment consisting of a boom-mounted cutting head, a loading device usually involving a conveyor, and a crawler travelling track to move the entire machine forward into the rock face.
Tech- Specifications:
Weight: upto 80tonnes
Total installed Power upto 300 KW
Excavation height: 3m to 5.5m
Track speed: upto 12m/min
RPM of Cutting head: 30 to 60 rev/min
Operating Voltage: 500 to 1100Volts
Cutting Head dia: upto 1067mm
ADVANTAGES:
High Productivity: OMS ranges 20/30 High production High Rate of Advance Continuous production Low labor requirement Can Advance in hard rock Lower Capital investment Can be used with existing mining methods
MECHANISED ROOF BOLTER A roof bolter is a hydraulically driven miner-mounted bolting rig used to
install rock bolts in mines, tunnels, underground power plants, and storage facilities.
Tech-Specification:
No. of booms: upto 3
Bolting depth: 1.2 to 3.7m
Dust collection: Integral dust collection
Total installed power: upto 100KW
Voltage: 400 to 1100Volts
Boom Extension: 1600mm
Swing Angle: 45’
Magazine Capacity: 10bolts
Drill Speed: Upto 650rpm
ADVANTAGES:
Automatic Grouting, Bolting Uniform application of Torque Reduced Manpower Fast rate of bolting Safe Optimum time usesage
HYDRAULIC FACE DRILLING RIG
Hydraulic face drilling rig handles positioning and drilling for high precision and productivity, offering several levels of automation to suit the mining activity.
Tech-Specification:
Number of booms: 3
Boom extension: max2500 mm
Torque 907 Nm at 1500 rpm
Electronic control panel: Adjustable with display
Total installed power: 293 kW
Main motors: 3x95 kW
Voltage: 690-1000 V
ADVANTAGES:
direct, fast and accurate positioning. Excellent reach and flexibility. high precision and productivity. Supports automation. Reduces cycle time. Safe
ENVIRONMENTAL TELEMONITORING SYSTEMS.
Tech-Specifications:-Dust Monitors.-Noise monitors.-Toxic Gas Detectors.-Methane monitors.-Robust cover for safety.-Flame proof and Intrinsically Safe.-Resilient in the extreme, arduous
conditions-High life expectancy-High accuracy electrochemical cell gas
sensing elements and Optical sensors
ADVANTAGES:
Easy monitoring in large mines. Instantaneous status of gasses. Accurate. Reduces manpower. Decreases fire risk in gassy mines.
ETM IN INMINE NO3ORIENT AREA
IN-PIT CRUSHING AND CONVEYING
Using an in-pit movable crusher and conveying the ore and/or waste out of the pit can reduce the haul costs.
Tech-Specification:
Inlet opening: 1 560 x 1 020 mm Rotor width: 1 500 mm Rotor diameter: 1 300 mm Rotor revolution (max engine speed): 650
rpm Track chain width 600 m 24" Belt width 900 mm Charging volume, approx.: 12m3
ADVANTAGES:
Fewer blockages Consistent size of output material High reduction ratios and throughputs Increased capacity Excellent quality of end product Ability to produce two sellable products by
using the screen box or running in closed circuit
REFERENCES:
http://www.ritchiewiki.com/wiki/index.php/Roof_Bolter http://www.atlascopco.in/inus/products/navigationbyproduct/
Product.aspx?id=1471015&productgroupid=1401267 www.ritchiewiki.com/wiki/index.php/Roof_Bolter cimfr.csircentral.net/364/1/1.pdf en.wikipedia.org/wiki/Longwall_mining www.slideshare.net/venkoos/longwall-mining
