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The Principle of Longwall Top Coal Caving (LTCC)

3159 ratings | 1171535 views
Caterpillar has extensive experience in the design of roof supports for specific mining conditions. Cat Longwall Top Coal Caving (LTCC) roof supports allow mining of seams seams thicker than 6 meters (20 feet). Following a conventional cut with a shearer to about 3 m (9.8 ft) the roof supports move forward and allow the caving of the top coal behind the roof supports a second conveyor mounted gob-side. This special LTCC method enables increased coal reserve recovery for only an incremental additional cost. This animation shows how it works.
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Text Comments (167)
Travel HUB-ZW (8 days ago)
Stas Perov (25 days ago)
ну-ка и будто обслуживать сборочный поток ?
Robert Aki (2 months ago)
Does this machine get teleported into the ground magically underneath all the rock/coal? I wonder how it gets there inside everything.
Siim Saare (2 months ago)
I can't understand where is the operator when the machine is running
Xeratok (2 months ago)
Its automation ;)
Andrey Medvedev (2 months ago)
Ни хуя не сообразил, однако было любопытно
Наша Казакша (2 months ago)
@Евгений Фомин они представляет не процес разработки, а труд машину даже не машину, защиту, поэтому что такие машины издавна в процессе
@Наша Казакша Это отлично, что вы разбираетесь в этом, однако анимация полного процесса не указывает
Наша Казакша (2 months ago)
Это метод добывание пи по подземным методом, желали представляет машину с само защитой, которое могут до многих мПа задерживать полный, если глядеть по ТБ то это выглядить горозда эффективнее чем последних видов буркомбайнов
Мне будто, что они сами не совершенно понимают
Sam Dru (2 months ago)
This is bit confusing
Papa Emeritus (2 months ago)
yea you deserve my dislike 👎
Akeem Jadgal (2 months ago)
I love u CAT so nice in I like you so much
Wrestling Encyclopedia (2 months ago)
Oh ok this makes me understand coal mining a whole lot less...
Kodi pauley (2 months ago)
That rear chain looks like it would be a constant problem. And how would you free it up if it gets stuck or even replace chain without pulling the whole wall. Or hell even recover it. Looks difficult
Thomas Kundera (2 months ago)
To really collect all the coal that others left behind, CAT's magic is at 2:20 lets pretend that all the remaining leftover coal is rocks, and we can just happily pretend we didn't left any! Clever.
Christopher Smith (2 months ago)
That is just for the sake of video. The rear gates open and close repeatedly to allow all the coal to be taken without putting too much at once. They stop when it turns to rock
Matt Denham (2 months ago)
A lot of rock goes on the rear chain as well
Quill Maurer (2 months ago)
Very highly automated system requiring only a few highly-trained operators ... remind me again of how renewable energy "killed" all the low-educated but well paying mine laborer jobs? Just as well in my opinion, as such jobs are among the most unhealthy and dangerous in the world, getting laborers out of mines is a good thing, even if they do have to find other jobs.
Ivan Kristo (2 months ago)
Tnx for this YouTube
RedesCat (2 months ago)
Just wait till they hit redstone
Mr H (2 months ago)
I dont understand. Firstly, how the machine can get underground? Where is the hole?
Christopher Smith (2 months ago)
They did a hole first
KBNoyes (2 months ago)
Mr H same way the men get in and the conveyor takes out the coal.
Sofa So (2 months ago)
Every mine has shafts and tunnels. Thru them you transport equipment.
No Name (2 months ago)
It would take a running start with a 15 degree downhill slope for one of these to break the crust on Hillary Clinton's vagina
FlyEye video (2 months ago)
Już widzę te postoje jak się coś zjebie z tym przenośnikiem w zawale, np złamane, zasztrabowane zgrzebło...
Intro M (2 months ago)
Dokładnie, inżynierowie po uju! Nawet jak coś wleci między zestaw a przenośnik będzie problem...
cybercab (3 months ago)
That's just cool.
Kersey J.R. (3 months ago)
I’ve done a lot of mining in Minecraft and I never needed some fancy red stone contraption like this.all I needed was a good diamond picaxe
papa bits (3 months ago)
Gravity is your freind in all mines
Karl Kaluppke (6 months ago)
Looks fine ! What ist the price for 1 unit ? ^^
Noah (3 months ago)
I looked at a website and they are about 1 billion dollars
Roberto Meza Salcedo (6 months ago)
very good
David S (6 months ago)
Mining subsidence is incredibly destructive in my area of southern Illinois.
SuperAgentman007 (6 months ago)
What happens if the main hydraulic system fails on the main lift cylinders do the people get crushed?
No, the supports have a hydraulic system that locks the fluid in the leg (hydraulic cylinder), this holds the shield up - maintaining the height, this system is protected by what is called a yield valve or some other similar arrangement, this allows for the fluid to escape from the leg (hydraulic cylinder) and yield rather than the leg failing. This takes a lot of compression force and generally happens slowly, in some cases it can happen quickly but generally plenty of time to remove people from the area.
Randy Scott (6 months ago)
Long wall mining is pretty amazing compared to what mining was a hundred years ago it may not be perfect but few things are.
jim bob (7 months ago)
Isn't this like a recipe for causing sinkholes on the surface?
Will Iam (8 months ago)
I hate Muslims but I like this machine
Shovelware (8 months ago)
Why is this in my recommendation?
Ning Shi (8 months ago)
Don't you believe that Chinese miners have pioneered and been experienced in this technology. There have been hundreds of installations of LTCC systems in China. The idea of this two legs shield LTCC support was invented by a Chinese miner.
Wow metal gear sólid music
Dziki z lasu (8 months ago)
I saw simmilar system (training version) and much more on a tourist route in Luiza mine in Zabrze, Poland. The main problem is that surface sink abaut 0,5 meter inmiedietly and remains unstable for a long time after, so don't rush on the motorway driving there and obey signes - it is mostly smooth but in some places there are hudge bumps.
White Rabbit (8 months ago)
2:20 Hogvarts magic??!
gav (9 months ago)
One slip and the machine is pinned forever
На видео все этак попросту, а в шахтах насамом деле все по-другому смотрится, то одно то другое.
Boa De Cocoa (9 months ago)
How do you fix the belt if it breaks?
Very slowly 🤗
John Doe (9 months ago)
Everything looks good with 3D animation
japrogramer (9 months ago)
Uhm terrible idea but is it being used today?
Peppironi89 (10 months ago)
Coal is sooooo 1900's
Tong Sheng (6 months ago)
@Peppironi89 - So, WTF is your point?
Peppironi89 (6 months ago)
Tong Sheng get informed better before trying to make a point...
Tong Sheng (6 months ago)
@I Am Sekou - I'm not sure that you can really quantify that, but I won't argue that with you. Could you enlighten us as to how many tens of thousands have been irradiated by coal and are now suffering the after effects? What about the 1150 square miles that have become uninhabitable due to the high levels of radiation from coal? I'm not here to argue. I was just pointing out that nuclear is certainly no panacea.
I Am Sekou (6 months ago)
@Tong Sheng Coal as killed more people than those incidents combined
I Am Sekou (6 months ago)
@Darren Kastl STFU dumbass
Kevin Burress (10 months ago)
Yeah I don't really want to mine coal and most of the people around nobody can really even pass a drug test to work at the mines. Idk.
Kobe Wild (9 months ago)
well you would have to be on drugs to go down underground.
Kevin Burress (10 months ago)
@Landon Smith it's just not what I want to do. Science is more fun.
Landon Smith (10 months ago)
You sound like you wouldn't make it anyways bud..
Joze Bizjak (10 months ago)
This method has been in use in in the coal mine in Velenje, Slovenia for the past 50 years and has been called Velenje mining method. Without CAT machinery. https://youtu.be/svO4zKX8FNg
1allan2 (10 months ago)
Nice, but it fucks up the surface ground structures for everyone above.......
HerpFerpDerp (11 months ago)
Why am I watching this at 3 in the morning?? I'm still in college....
Electronicpoacher1 (11 months ago)
as an ex miner I have seen the gob (we called the gove) hanging for yards before it collapses, the men evacuated the face when it was due to drop in case it came over the butts, which it did frequently with such a hang,,,if this happened it would crush the back end of that machine without a second thought
Christopher Smith (2 months ago)
so they have to replace the back end constantly?
Evelin Design (1 year ago)
Amazing job thanx for sharing
ezaz babu (1 year ago)
I have not understand this process.
eath nowen (1 year ago)
What a load of shit probably be building homes there in the next 10 years that will kill people when they sink
the bean (8 months ago)
Stupid boy
ROUSS SOTHEARA (1 year ago)
acc vs
Ameenk Chanel (1 year ago)
Rakesh chakrobarty (1 year ago)
Amezing machine...
pietzeekoe (1 year ago)
Man what an awful choice in "music". Felt like I was in a space battle.
HERPY DERPEDY (2 months ago)
This is actually a machine used to harvest resources on Mars. The government doesn't want the sheeple to know though.
Adrian Filip (8 months ago)
charles guglielmi (1 year ago)
Não entendi nada
On Your Face (1 year ago)
sink holes in the making.
Christopher Smith (2 months ago)
@Luke millions of people. in america they can mine right under your house. theyll start miles away. this is better than strip mining though. with strip mining theyll literally remove all the mountains around your house
Czorńy Lisek (10 months ago)
Over mines with such type of extraction. Millions
Luke (10 months ago)
Who lives on top of a coal mine?
On Your Face (1 year ago)
watching on a Cat s60.
notafakeaccount (1 year ago)
The poor people who life above
Cintai Aku (1 year ago)
what about the safety of the driver?
Cintai Aku (1 year ago)
How safe to driver?
MrSaemichlaus (1 year ago)
Doesn't the cave-in behind the machine cause sinkholes on the surface? Or is this done very deep where solid rock is likely above the loose "gob"?
Christopher Smith (2 months ago)
​@Sasha Naronin yeah we will see how your house sinks uniformly when they mine under it
Cragified (10 months ago)
Uniformly doesn't mean without damage. "Coal companies that practice longwall mining are allowed, by law, to cause damage to structures, including homes. They are also allowed to disrupt water supplies to homes and livestock. Coal companies are required to pay for repairs to homes and to replace water supplies, but, frequently, residents find themselves embroiled in lengthy battles with these companies to have their living conditions restored." Happens all the time since you can't stop them from undermining your property due to the way of who actually owns the coal in the U.S. works. https://www.coalfieldjustice.org/longwall-mining/
Sasha Naronin (11 months ago)
It is done deep, but it often causes large areas of surface to sink uniformly.
Ted s (1 year ago)
This looks like it would have at least 5000 problems
Jarid Gaming (1 year ago)
Earth killer
John Doe (1 year ago)
If this thing is boring a hole then where do conveyors dump there load
Straight Whitemale (1 year ago)
Doubling the World supply of coal?
Gene Hall (1 year ago)
I've been in the mining industry all of my life. Cat, stick to the doing what you do best. Surface construction and mining equipment, leave inside to Joy.
J (1 year ago)
Leave that nasty, filthy shit in the ground!
KENNY WEBB (1 year ago)
Show a mark20wilxox miner nd. MN d7itting jCks
Rainauday Neerakattu (1 year ago)
sir naku 15 years can I join i have intrest na number 8340880402
Georgia Duckworth (2 years ago)
you are leaving g tube bottom coal and mote than likely the best coal
Georgia Duckworth (2 years ago)
that's a massive waste of coal
nice videos I am also mining engineer
Srinivasarao Thanikonda
Mad Mike (2 years ago)
two pan lines....brilliant!
Xiang Fan (2 years ago)
compulsory subject of 3rd year mining engineering degree study  ( Mining C:coal mining)
Jonny Diamond (2 years ago)
Wow, high effective system! :) I am interested over a long time how this machines works...now I have see it. Great machines! But how are the machines are transported into the mine? :O
I'm a longwall sheildman, in Wv. At my mine, they are brought in the mine through our supply slope on low boys. Then a motor hooks up to them, then they bring them to section for us to offload. But most times, you just move them from panel to panel underground.
Jack Hubley (2 years ago)
So the rear canopies open to let some of the coal down on the conveyor then to canopies close and the coal above them is magically changed to rock by the Poop Fairy. Very impressive!
Christopher Smith (2 months ago)
@andi suhendi they do close
andi suhendi (2 months ago)
I think that can not to be closed. The rock too heavy.
Christopher Smith (2 months ago)
I think its implying they take it all till its rock. Lol. But its a dangerous way to mine. Youre literally collapsing the ground youre standing in. Bet you they guys making millions arent down there
welshwizard822 (2 years ago)
interesting but as a retired south wales miner I would like to see how they fix/repair the rear panzer when it breaks down. Or dont they break down? it would be fun when the bottom chain breaks and its got to be pulled back 20 feet (only a face worker would know)
Chris Griffiths (2 months ago)
@Matt Denham Thanks. Must be a Reason for Not using Bigger Chocks.
Matt Denham (2 months ago)
@Chris Griffiths Broadmeadow mine Australia
Chris Griffiths (2 months ago)
Welshwizard, AFC's are Steel Component Conveyors, the Conveyor parts rarely fail, however the Drive, Gearboxes can but they are at the ends so resonable accessable. Also High Profit mines Refurbish their long wall equipment every time a block is complete, hence they try not to let the conveyor wear out. Further, this is an Interesting idea, but I think there would be other problems, such as the Coal Falling in front of the Chocks. Is this actually be used anywhere?.
Raimundo Ferreira (1 year ago)
master bates , I’m sure CAT has a plan for that too
welshwizard822 my thoughts exactly. could you imagine that
Charlie VanHorn (2 years ago)
Didn't Cat abort the underground business?
Charlie VanHorn (2 years ago)
J Hatch, this video starts out with long wall Coal Mining. DBT acquisition was a long time ago. The coal underground equipment was an acquisition they made with the Bucyrus deal (Major Disaster). Joy was acquired by Komatsu.
J Hatch (2 years ago)
Charlie VanHorn no they bought out DBT one of the largest underground mine equipment producers up there with joy global
Patrick Berube (2 years ago)
Heck no! Not hard rock mining anyway!
Dawid (2 years ago)
ciekawe aczkolwiek nie do końca dobre rozwiązanie z tym przenośnikiem ciągnionym za obudową
Road Killer (2 years ago)
In what program was created this model?
ARMOR PIERCER (2 years ago)
Road Killer is real
Calli Blankenship (3 years ago)
looked good on paper & video doubtful that it would work plus repairing a broken chain would be costly & unsafe
Laughing Man (3 years ago)
Can a system like that also work with other materials? Like iron or something else...
LegendLength (2 years ago)
I reckon you'd need a standard dynamite system of some type, not an expert though
mookett (2 years ago)
What works then on hard rock when a joy continuous miner wont cut
Laughing Man (2 years ago)
Thank you
Patrick Berube (2 years ago)
No because metals are found in harder rock than coal. Longwall is a soft rock mining method. This system can never work in a hard rock mine.
philip mann (3 years ago)
the rear afc is clever but repairs are dangerous and costly
shuffek (2 years ago)
I'm curious how does it looks when the rear conveyor chain breaks, and it must be changed. What about miners safety when they are needed to work between powered supports?
Judge jimbo Browntown (1 year ago)
We broke chains ..... to get a good work spot u have to walk urvsheilds up in a "v" formation the post behind shields that's how we replaced a shield canopy
J Hatch (2 years ago)
Howard McKay I call bullshit!
Nick Muscat (2 years ago)
Howard McKay I'm currently working in a coal mine and have for the past 4 years with this exact CAT LTCC long wall and we have broke the chain probably 2/3 times in the last 18 months
Howard McKay (2 years ago)
I worked 5 years on coal faces and we never had an AFC chain break.
Nick Muscat (2 years ago)
Coalminer haha yes the chains do break
Masaharu Morimoto (3 years ago)
Thanks! easy to follow!
Element of Kindness (3 years ago)
Awesome simulation. Made it easy to understand how this form of mining works.
Robert Kennedy (3 years ago)
i worked in a mine in NSW that was super thick and this technology was not available at the time so we left a lot of coal behind after cutting a pass of about 4.7m high. This would have been ideal it also has the advantage of removing a potential spontaneous combustion threat in the goaf with large amounts of coal left behind . I would like to see how this system works in a very gassy mine not sure if it would be good or bad?
Ben Dragon (2 months ago)
@Christopher Smith In all honesty, going with Thorium reactors is probably our best option when it comes to alternative energy supply.
Christopher Smith (2 months ago)
@Ben Dragon but what about in the next one where the fire ignites in the pocket and theres no time? Its a dangerous system and there is no way to make it completely safe. Notwithstanding the fact they are mining by collapsing the ground they are standing in. Hopefully soon enough things can go unmanned or we get off of coal completely
Ben Dragon (2 months ago)
@Christopher Smith The sprinkler would douse the flames that went around the control box prior to the methane explosion though.
Christopher Smith (2 months ago)
@Ben Dragon A sprinkler system isnt always going to be able to douse an explosion that travels a quarter mile a second
Christopher Smith (2 months ago)
@Matt Denham yes it was
Krishna Deo Prasad (3 years ago)
nice video for learners in mining technology.
Mark Adkins (4 years ago)
Looks like a nuisance. And the coal falls witb the clapse of the roof
qwerty112311 (2 years ago)
um no
Thiago Xavier (4 years ago)
Can anyone explain to me how is the upper coal cut?
Ning Shi (8 months ago)
The single roof support or a small group of supports were lowered and shifted foward to leave room for the upper seam to be crushed by the ground pressure. The rear cannopies of these support were then openned for coal caving and loading on the rear AFC until an unexpected amout of rock obseved by the operator or in a pre-defined time. This process will be executed from one end of the face to the other end and then in a reversed direction.
Judge jimbo Browntown (1 year ago)
The gob weight makes the top coal fall behind the shield
BREAMBASHER (1 year ago)
the face machine has 2 discs one at each end and is called a double ended ranging drum shearer the lead drum cuts the top coal and the rear drum cuts the floor coal when it reaches the gate end the rear drum become the lead drum and visa versa as it then cuts its way back to the other end of the face the drum size is about 2m diameter you need one at either end to cut the max depth the coal above that is not cut breaks naturally under its own weight when supports are advance then this falls onto rear conveyor system
hemanta patra (3 years ago)
+Thiago Xavier Xavier: it caved in itself

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