Longwall top coal caving alpha sophie

ALPHA Intelligence Holdings Co. Ltd.
Australia  China  Zambia  Pakistan Chile
 澳大利亚  中国  赞比亚  巴基斯坦  智利 Web: www.alpha-
technology.com.au

Longwall Top Coal Caving Mining (LTCC)

About us
Integrated engineering solutions to coal and minerals.
Our services include underground mining, open cut mining, mineral processing and
materials handling. We provide engineering, equipment, project delivery and operations
services for coal, iron ore, copper, gold, zinc, silver and other base metals..
Leading in 3D engineering and intelligent operation in coal preparation. We’re
the first company who developed 3D engineering methods successfully in China.
There are only 3 companies can provide the Bigdata based intelligent operation system
For CHPP worldwide. We're one of them.
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Sophie Guan MOB:+86-135-5023-0907 | Email: sophie.guan@alpha-technology.com.au

All our engineers come from famous international process engineering companies,
Engineering Team Experienced in design, construction, project delivery in CHPP,
mining and mineral processing field.
In last four years, our engineering capability has been recognized by mining giants. Our clients are
Rio Tinto, Anglo American, Worley Pasons, Shenhua, Xstrata Coal，etc.
We have already established branch or office in Australia, India(Agent), Pakistan, Zambia, and Chile.
About us
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Four Major Business - 1
Open
Cut
Mining
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Underground Mining
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Process
Coal Washing Plant  Screening & Crushing  Sands Washing  Slime Drying System
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Materials Handling
Tube Pipe Conveyor
Express Load-Out Station
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Longwall Top Coal Caving Mining Brief
Longwall Topcoal Caving (LTCC) is a method of extraction for
underground mining of thick seams. It uses a longwall set-up
and natural forces to aid in the winning of coal. With this
method of extraction only a single longwall is developed at the
foot of the seam. The control of the roof layers at the face is
by means of powered supports. At the face, the coal is mined
with a Shearer at a set height, and transported out of the mine
using an armoured face conveyor (AFC). According to the rate
of advance, the upper coal section of the seam is then
induced to cave at the goaf side and is removed by a second
AFC, which is situated behind the face supports.
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First LTCC Mining Method in Australia
Application & improvement
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Approval by Australia – 12th July 2006
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First LTCC Mining Method in Australia
Austar Coal Mine
Yancoal Australia
Yancoal chose Austar to introduce a
new technology called Longwall Top
Coal Caving (LTCC) technology in
September 2006.
LTCC technology is ideal in thick coal
seams and enables much greater
resource recovery in seams such as
Austar’s Greta Seam.
By using the LTCC mining method, a
further 80% of the additional coal in
the seam can be accessed and
recovered, significantly improving
the total recovery of the in-ground
coal resource and overall mine
economics.
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LTCC Mining Method Methodology
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Special Designed Roof Supports
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Depth of Coal 400-700 Meters; Currently, the mining depth is 530 Meters;
Coal Seam Thickness 4.5-7 Meters; Phase 3rd 6.5-7 Meters.
Mining Production Planning
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LTCC Mining Units Completion and Commissioning in Oct. 2016
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Front
conveyer
rear
conveyer
crab
support
Groove
Support
crab
support
reversed
loader
move tail
3D Assembling Layout of LTCC Mining Units
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rear conveyer
Front conveyer
UpperCrossheading
LowerCrossheading
crab
support
face
support
transition
support
Groove Support
reversed loader
belt
monorail
pump station
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M o n o r a i l
5% of the emulsion are transmitted through the drill
hole from the ground to the pump case
Name Specifications Quantity
350bar high pressure DN50 2
420bar high pressure DN38 1
return liquid DN63 2
Atomized High Pressure Water DN63 1
cooling water DN50 1
Waterborne Fire-Proofing DN50 1
High-pressure Air DN50 1
3.3Vcable 185mm2 2
transformer 6250kvA 1
pump station 4台泵 1
Mining Units of Fully mechanized top coal caving face
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Coal Shearer Loader
The motor power 1250kw
Traction VVVF Pin rail electric
traction
Haulage speed 0-35m/min
Drum diameter 2.2m (2.2-3.5m)
Cutting depth 800mm
voltage level 3.3kv
Bridge Stage Loader
Link specifications 34x126mm
chain speed 1.25m/s
capacity 3000t/h
groove widths 1200mm
voltage level 3.3kv
Crusher
Coal quantity 3000t/h
voltage level 3.3kv
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Armored Face
Conveyor
Features Details
The motor power 2x540kw KP-45 type CST gearbox drive
Link specifications 42x146m
m
Hydraulic motor tight chain device at the head and the
tail of the machine
chain speed 1.12m/s The tail of the scraper chain tightened automatically
capacity 1800t/h Chute form: the front of the machin-PF6; the end o the
machine-PF5
Crossheading widths 1000mm
voltage level 3.3kv
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Two pillar top coal caving support
Hydraulic Roof Supports of top coal caving face
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Crab support
Support form four columns strut shield
type caving pressure support
space 1756mm
Pull off distance 800mm
weight of the support 34t
Column diameter 280mm
supporting height 2100 - 3900
setting load 799t
working resistance 998t
Groove Support
Support form fission 8 pillars left and right
supporting height 2.2-4.5m
The way of move move left and right
Hydraulic Roof Suppor0ts of top coal caving face
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Automatic pressure compensating
system for high pressure
This system can help roof supports to
have stable high setting load
automatically.
Advanced Technologies:
The first Fully Mechanized Caving
Equipment used in Austar coal mine
Principle of Automatic pressure compensating system
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The mining units can't satisfy safety
production while meet weak roof of tail.
The adaptability of the crab support is
not very well.The operation is complex
and the production efficiency is low
The phenomenon of rear conveyer takes
back coal is serious, this will make it stop
working.
The head and the tail of the front
conveyer rised
Major Problem of Austar LTCC Method
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When the condition of the tail top plate is not very well,the tail beam of the crab support
will press the end of the tail.It'll cause the support move,the end of the tail is difficult to
operate。
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The adaptability of the crab support is not very well.The operation is complex and difficult. The
produce efficiency is also low.
When the condition of the roof of tail is not very well，There are many equipment damage
accidents on the crab support.
The middle column of
thr crab support is
broken
The pit on middle column's
top beam is broken
The part of passage
frame is broken
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The operation of crab support is complex and difficult, it is not
easy to realize automation
the cable of the rear of the machine is bad base case is warping
the support is skew
tail beam presses on the rear of the machine
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Both ends of working face need to be connected to the Internet in order to protect the rear machine
head and empennage
Networking will take long time per shift , high cost and low efficiency
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The phenomenon of rear conveyer takes back coal is serious, this will make it stop
working.
Rear head is short, the phenomenon of rear conveyer takes back coal is serious.
Especially the baseplate Mudstone will become soft when it is wet, in the shape of mud,
and the pressure of working face is high, when floor heave occurs, the design of rear
chute and open bottom causes more baseplate mud been brought back to empennage
After fore conveyer head and empennage rise,
manual dropping and clean-up labor intensity is
high, the efficiency is very low, affect production
greatly.
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For the problems of LTCC's application in Austar coal mine, combined with working face
arrangement method of Australia and two alley timbering form, according to the strict
requirement of safety, high efficiency, economy, environmental protection of mine, we have
improved the fully mechanized corollary equipment to optimize the equipment and improve
efficiency
Rear conveyor head adopts crossed side -
dump
Install two set of new shield supports in
the main part
Rear empennage and 4 sets' crab
supports move inside 4 sets' supports to
working face, the original location install 4
sets of new 2-column type shield
supports
SOLUTIONS for Major Problem of Austar LTCC Method
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SOLUTIONS for Major Problem of Austar LTCC Method
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Technical improvement and development prospect of LTCC
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2-column Type Top Coal Caving Normal Support
Supporting height 2100mm ~ 4500 mm
Support center distance 2050mm
Working resistance 1427 T @pressure45MPa @height3500mm
Supporting density 116 T/m²
Column cylinder diameter 450 mm
The main top beam length 5540 mm
Support advancing interval 1000 mm
Control Method PMC-R
Weight 56.5 T
Hydraulic support test 60000times
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Three-column Crab Support
The overall design of three-column crab
support is simple, support strength increases,
especially the support force of top beam's front
end increases obviously, the rear supporting
space also becomes bigger, support actions are
reduced, it is easy to realize fully automatic control
Canceled the telescopic front
beam,retained side wall plate, whole top
beam,in the front row is two columns of
φ380mm,the rear is one column of
φ380mm,shield beam uses jack of cylinder
diameter φ200,hinged unpowered gangue
blocking plate with inhibiting device in the
back of shield beam
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Rear Chute Cover And Top Coal Increasing Device
With development of the monitoring working
condition technology, as well as the improvement of
ring chain strength and manufacturing quality which
has almost reduced chain breakage. Adopted
covered chute is the demanding of publicity of
comprehensive technology, simultaneously rear
chute cover owns many superiorities.
Top coal increasing
device is adopted by
Xinglong coal mine firstly in
domestic. It is piloted in
Austar coal mine with a
good result. Via update and
promotion , transport
machine of North Gongnila
coal mine is installed top
coal increasing device. This
device has obtained Austria
patent.
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Rear cross side unloading head Rear tail linear
arrangement driving
device
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Bottom bracket
Reducer box protection plate
Raise Jack Base
Second Base
Raise Jack
Support connecting head
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“POWER CHAIN”
Novel transfer machine scraper
chain“POWER CHAIN”
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SOLUTIONS for Fast Advancing Working Face of LTCC Method
Underground Monorail Transportation System
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We imported global advanced monorail locomotive technology of Czech STAVUS
company which in large content has improved the rate of working station
mobility and workers transportation.
Localization process: Partial components and the whole assembly work is being
prepared, which is expected in 2016 to achieve the whole machine in china.
Transport System of Underground Device and Workers –
Monorail Locomotive
Underground Transportation System
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The coal industry is the pillar industry of our country. With the continuous application of
new science and technology in coal mining industry, the development of efficient and
efficient auxiliary mode of transport has become an important task for the construction of
China's coal industry . Since 2004, diesel powered monorail locomotive is used to some
extent in china. In the coal enterprises, diesel monorail crane is mainly used for
producing data, personnel transport and working face moving in the mining process, and
achieved good economic benefit
Monorail locomotive as mine auxiliary transportation equipment, in western
countries has decades of history, better solves the problem of low efficiency of coal
mine auxiliary transportation, to improve coal production to the positive role.
Application of Monorail Locomotive
Underground Transportation System
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The monorail has the self motivation and driving device, compared with
the general transport, monorail is without the problems like off the track, off
the danger of rope, a sports car, which greatly reducing the probability of
auxiliary transportation safety accidents, realize safe and safe security
production.
Advantages of Monorail Locomotive
Improvement of transport rate and reducing of transport workers
mean the lower cost of coal as well as it can be as the auxiliary
transportation system for tunneling of Fully Mechanized Heading
machine to reduce preparation time before working face installation.
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Monorail Locomotive
The monorail is widespread in Europe, South America and other developed countries mining.
Wide application: Monorail Transport system has a huge advantage in thin coal seam, medium
thick coal seam, inclined coal seam.
Safe and efficient: Monorail can be safe and efficient completion of face equipment handling,
personnel transport etc.
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THANK YOU!
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Longwall top coal caving alpha sophie

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