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7/31/2019 Draglile Mining
1/15
Hoist Rope
Boom Point Sheave
Hoist Chain
Dump Rope
Bridge support Rope
Mast
Boom
Boom Foot
TubShoe
Hoist Drum
Drag Drum
A Frame
Drag Chain
Dragline Bucket
Major component of a dragline
KhanindraPathaksLecture
1
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Hoisting line
Boom
Boom Point Sheave
Dumping Line
Drag Cable
Bucket
DRAG LINEKhanindra Pathaks Lecture 2
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15-200
Hdm
Hdg
Rdm
Rdg th
RcrRb
Hb
Hp
Main Working Parameters of a Dragline
Khanindra Pathaks Lecture 3
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Dragline Faces
End Face (Deep Cut) End Face (High Cut)
Combination Digging
Khanindra Pathaks Lecture 4
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A
h
HB B
A1
y
1 21wd
Awd bFS
Hwd
Khanindra Pathaks Lecture 5
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XXXXXXXXXXXXXX
A TYPICAL DRAGLINE OPERATION
HIGHWALL
BOOM DIGGING POSITION
DRAGLINE POSITION No. 3
PREVIOUS DIGOUT
KEY CUT
DRAGLINE POSITION No. 1
DRAGLINE POSITION No. 3
NEXT DIGOUT
DRAGLINE POSITION No. 2
BOOM DUMPING POSITION
EXPOSED COAL SEAM
HIGHWALL
FLOOR
DRAGLINE POSITION No. 2
DRAGLINE POSITION No. 1, 3
KEY CUT
PRODUCTION CUT
BACKWALL
SPOIL
PREVIOUS CUTKEY CUT
SPOILCOAL SEA M
A A
SECTION A-A
Khanindra Pathaks Lecture 6
7/31/2019 Draglile Mining
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Extended Bench Method
PIT WIDTH
Overburden to be rehandled
Dragline Dump Radius
This method of face development is applied when effective reach of the dragline is to be extended.
This is associated with certain degree of rehandling This method is useful when the overburden depths can not be handled by normal casting It may be necessary when overburden depths are gradually increasing or there is a temporary change in relief.
Khanindra Pathaks Lecture 7
7/31/2019 Draglile Mining
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Bridge Length
Block to be excavated
Highwall bench to be excavated
New Pit
At the completion of the previous block, the dragline is located at the endof the bridge. From this position the last of the block of OB can bespoiled directly . To start excavation of the new block, the dragline iswalked off the bridge and placed in line with the new high wall at A. Thisis now ready for providing key cut for the block to be excavated.
A
Khanindra Pathaks Lecture 8
7/31/2019 Draglile Mining
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New Pit
At this situation, the key cut is completed. Atthe start of this cut, the dragline must be farenough along the cut to allow the bucket tobe pulled right up to the length of the newblock without the drag rope limit switchesbeing activated. As the cut is deepened, themachine walks forward and across the cutto keep in line with the highwall batter at
the depth it is digging. The key cut spoil isused to form the bulk of the next bridge.
A
New bridge beingBuilt from key cutspoil
Khanindra Pathaks Lecture 9
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New Pit
Here the new bridge is completed to therequired lenth by part of the highwall benchand the top of the block. Same draglineposition is used to excavate the high wallbench as well as the top of the block. Dozris used to clean up loose bench materialwhile the dragline is digging from the top ofthe block.
New bridge
Highwall Bench
Top of block
Khanindra Pathaks Lecture 10
7/31/2019 Draglile Mining
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Corner of key cut
After completion of the digging of thehighwall bench further excavation of thebulk of the block takes place. To directlydump the material , position ofhe draglinewill have to be proper.
Start of new spoil pil
Khanindra Pathaks Lecture 11
7/31/2019 Draglile Mining
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Corner of key cut
Excavation with DL close to the edge of theworking face. Final clean up of top of coalsam is carried out at this stage.
Working Face
Khanindra Pathaks Lecture 12
7/31/2019 Draglile Mining
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Corner of key cut
Final stage. Clears the last part of theprevious bridge
Khanindra Pathaks Lecture 13
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Khanindra Pathaks Lecture 14
7/31/2019 Draglile Mining
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y40
20
0
-20
-40
20
I40 60
III
IIRotationaxisofexc
avator
Variation of the angle of inclination of the bucket bottom within dragline working zone(I - Rotation axis of excavator)Khanindra Pathaks Lecture 15
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