Draglile Mining

7/31/2019 Draglile Mining

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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



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A

h

HB B

A1

y

1 21wd

Awd bFS

Hwd



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XXXXXXXXXXXXXX

A TYPICAL DRAGLINE OPERATION

HIGHWALL

BOOM DIGGING POSITION

DRAGLINE POSITION No. 3

PREVIOUS DIGOUT

KEY CUT



NEXT DIGOUT


BOOM DUMPING POSITION

EXPOSED COAL SEAM

HIGHWALL

FLOOR


DRAGLINE POSITION No. 1, 3

KEY CUT

PRODUCTION CUT

BACKWALL

SPOIL

PREVIOUS CUTKEY CUT

SPOILCOAL SEA M

A A

SECTION A-A



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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.



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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



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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



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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



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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



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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



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Corner of key cut

Final stage. Clears the last part of theprevious bridge



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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

Draglile Mining

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