This document describes the components and operation of a continuous miner machine used for underground coal mining. It discusses the main parts of the continuous miner including the cutter head, gathering arms, conveyor system, traction system, dust collector, and electrical and hydraulic systems. It provides specifications for the JOY 12CM15 continuous miner, which has a cutter head diameter of 1.12m, cutting width of 3.3m, and maximum cutting height of 4.6m. The continuous miner uses its cutter head and gathering arms to extract coal, which is then transferred via the conveyor system for removal from the mining face.

1. Nirbhay Kumar Sinha
Roll-2013MT0130
Branch-Mining Machinery Engg.
ISM Dhanbad

2. INTRODUCTION :
 Continuous mineris a machine used for
cutting and loading of coal used in
underground Board and Pillar mining
operation.
 The JOY continuous minerproduct line has
been developed to meet the high productivity
requirements of today's underground mining
industry.

3. Types available in the market : -
The continuous miner product range is
segmented by mining height requirements into
three machine classes for low, medium and
high-seam applications.
 14CMSeries Continuous Miners
 12CMSeries Continuous Miners
 12HMSeries Continuous Miners

4. Main parts of a Continuous
Miner : -
 Cutter
 Gathering head
 Conveyor
 Traction
 Dust collector
 Manifold Hydraulics
 Electrical Circuits

5. CONTINUOUS MINER (MAIN
PARTS)
CUTTING
PEAKS
CUTTER DRUM
GATHERING ARM
CHAIN CONVEYOR
HYDRAULIC SHEAR
CYLINDER
BOOM
TRACTION

6. Specification : -
 JOY 12CM15 is a high capacity, totally
remote controlled CMdesigned formedium to
high coal seam applications. The machine has
 Cutter head drum Diameter - 1.12m
 Cutting Width - 3.3m
 Max cutting height - 4.6m
 Conveyor width - 0.76m
with 2.41m/s speed

7. Specification : -
 CM is equipped with 2 cutter motors, with
standard clutch protected, AC induction Motors
(170KW) mounted parallel to centreline of boom
frame.
 Each cutter motor connects to the gearing of gear
case using an internal torque shafts.
 2 gathering head motors (AC) of 40KW
 2 traction motors (DC) of 26KW
 1 pump motor of 52KW;
 1 dust collector fan motor 19KW.
 Total Weight of CM = 58 tonns(58376Kg)

8. Cutter Drum: - Left Cutter
Drum
Centre Cutter
Drum
Right Cutter

9. Cutter Head
 The cutter head may be of borer type,
Oscillating head type and Horizontal drum
type.
 The majority of the continuous miners
currently in operation are of horizontal
drum type on which block are mounted in
the form of a scrolls, carrying peak boxes.
 The boxes are welded or bolted to the
drum.

10. There are 2 cuttermotorone in each side of the machine.
AC induction, 1500 rpm
170KWeach.
Cutter Motor.

11. Tungsten carbide teeth used for cutting.
Replaced when broken and treated as consumables.
Peaks consists of two materials, tungsten carbide and
PEAK (TEETH)

12. The most important physical properties of the cemented
carbide are hardness and toughness.
The value of both these properties can be varied by the
presence of cobalt.
Variation of Hardness/Toughness with % of
cobalt
% of Cobalt

13. The most important physical properties of the cemented
carbide are hardness and toughness.
The value of both these properties can be varied by the
presence of cobalt.
Variation of Hardness/Toughness with % of
cobalt
% of Cobalt

14. Angle formed by a line drawn longitudinally through the shank
and the point of peak and the line forming the radius of the
peak point.
The sum of the back and front clearance angles will be equal
Angle 0f Attack & Clearance Angle of a
PEAK
Angle of Attack
Front Clearance Angle
Back Clearance Angle
Angle of Attack

15. 5 Ton Hydraulic Jack.
Cutter boom.
Cutter
Boom
Shear
Cylinders

16. Gathering Head : -
Centrifugal Loading Arm
These CLA’s rotate in opposite
direction to each other.

17. There are 2 Gathering motorone in each side of the machine.
AC induction
40KWeach.
Gathering Motor.

18. Gathering head is raised and lowered by a single
acting lift cylinder on each side of the machine.
Gathering Head Lift Cylinder.

19. Conveyor : -
Foot Shaft Flight
Foot shaft is a shaft with a
(4 toothed) sprocket, over
which the flight barchain
sits, whose construction is
responsible formovement
of coal

20. The movement of flight bar is >100mm from centre ----chain
should be tightened.
The movement of flight bar is <50mm from centre ----chain
should be loosened.
ConveyorChain Adjustment:

21. ConveyorChain Adjustment:
 A loose chain may jam, a tight chain
may become overloaded causing
high temperature in the drive or foot
shaft leading to excessive wear. So,
in order to address this issue a
tension adjustment arrangement is
made by incorporating a spring at
the end of the take up cylinder to
the side of swing conveyor.

22. Traction :-

23. Traction :-
 Incorporates Crawler chain, brakes,
Traction Motor, Traction planetary and
Traction Reducer.
 Traction motors are of 26KW of DC.
 Traction motors are connected with
reducer and the sun and planetary
arrangement helps the crawler chain to
move which sits on the sprocket
connected with sun shaft.

24. Traction :-
 It is equipped with spring applied,
hydraulically- released traction brakes,
which are normally applied.
 Springs inside brake assembly push a
piston against brake disks results in
stoppage.
 These are released when hydraulic
pressure is applied to compress the
springs and retract the piston.

25. This uses a slurry pump – motor to remove
slurry from dust collector sump. It is located
in the dust collector fan compartment.
Dust Collector.

26. Electrical System:
 The input power to the CM is a 3 phase
950v AC (though 1100v or 1.1KV is the
specified value).
 Traction motors are controlled with a dual
6SCR drive system.
 A control Transformer drops the line
voltage to 110v AC for the control circuit,
and 12 volts for the head light circuit.

27. CONCLUSION:-
 In this world where nowadays where
technology matters CM plays an important
role and is a kind of boon in the field of mining
industries, which has not only reduce the
manpower and accidental records but has also
increased the coal production as compared to
the conventional methods.

28. REFERENCES:-
 Wikipedia
 Google Search
 Google Image
 Class Notes (Ajit Kumar Sir)

29. THANKYOU