Is the reinforced bin beside the handrail damaged as well? Can't tell from the pic if the rib on the side of the bin is curved upwards as part of the construction or inwards from an impact.That‘s where it was until it was wired so it could be moved, hence the handrail, um, ‘interaction’.
Thanks for the insights.Oh… I said I’d detail how a small plant works.
Cat 992 loaders dump into crusher bin (2 loaders going constantly when up to speed, 22 to 25 tonnes per bucket).
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It lands on a grate called a grizzly feeder which vibrates at an adjustable rate via VSD and smaller stuff goes straight through to belt, big boondies (up to wheelbarrow size) move along to jaw crusher.
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If any rocks are too big for the jaw to grab, we use a remote control to move the rock breaker (big orange hydraulic rammer) to smash them in half so the jaw grabs them
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From there it’s all on to the lower feed belt up to top bin of screen building. This has a belt feeder on each side to feed the screens.
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The screens separate the product into three sizes. Stuff that can’t get through top screen is oversize, and heads on a conveyor back to crushing, to another belt feeder and in to cone crusher, then back on to feed belt back to top of screen to be sized again.
If it fits through top screen but not second screen it is ‘lump’ and heads out along a couple of belts and transfers to the lump stacker.
If it falls through the lump screen it is ‘fines’ and goes on the fines belt to the fines stacker.
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Screen building;
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Crusher building;
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The stackers are radial stackers meaning the tail is a fixed pivot point and bogeys will move on an arc of 80 degrees creating kidney shaped stock piles when they’re used. At the moment the radial drives aren’t connected as we don’t have permission from the muppets, they are treating it as mobile plant and want earth leakage, even though the drives are VSD driven and will require EL set at 150ma which would still kill most people so pointless but meh… so they’re temporarily fixed point stackers.
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Well I’m really sorry some pics are sideways or upside down, apparently that’s my fault not the forum software even though this is the only place in the entire intergoogleinstafacetube it happens lol
So don’t waste your breath whinging at me 😇
Well that’s a really over simplified explanation of a small crushing plant but it’s very efficient and cost effective. It will usually feed (through splitter gates) straight to Rio’s stockyard belts and our stackers are just for temporary storage when main stockyard belt or TLO (train load out) is down for maintenance.
This will have an additional cone crusher and screen building added in about Feb/March which will increase capacity to about 10Mt a year. Powered by 4 x 1000kW generatirs
Compares to Rio’s $3.5B flagship screen and crusher next door that should do 42Mt a year.
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Any questions I’ll try my hardest to answer but no promises!
I asked the boss today, the earth leakage for this is required to be set at an amp! Yep that’s right. An amp. Certainly not for personal protection but in Rio land it is.Earth leakage protection at levels above 30ma is not for personal protection but for equipment protection. The main issue is that earth leakage levels higher than about 100ma can light fires if the conditions are right. This is of particular concern in coal mines but not too much of an issue elsewhere. Having thought about that briefly I guess that paper mills and flour mills and a whole heap of other places can make good use of high levels of earth leakage protection but I would have thought that most mine sites could cope with 1000ma or more of earth leakage without issue.
How does the ore get to where the loaders are dropping it into the bin, how far away is the enrichment plant and how does it get there? Are the bogeys on the stacking converor powered or do they just get towed into position?
Yeah, 1000ma is normal for the hard rock mining environment.I asked the boss today, the earth leakage for this is required to be set at an amp!
Hmmm, Monday is 45 degrees with 80% humidity? There won't be much work getting done that day. Sounds like a good day for watching training videos in the mess or doing paperwork.Looking forward to Tuesday’s cool change of 44 🥵
I hope that it's in the normal maintenance cycle to do insulation checks on the "spare" motor. I heard of one place that went to swap in their spare homogenous grinding motor, that had been in the wharehouse unused for years, only to find that its insulation readings were unacceptable. It came good within a couple of days after being fitted with space heaters and purged with dry nitrogen. There was a bit of panic to begin with though.this is a $1.1million motor, weighs 34 tonnes and takes two days to swap for the spare.
Feb 5th mate… only a couple of degrees cooler than hottest time in pilbara but most humid by a long shot.You can have that to yourself. I hope WA stays shut till the winter, as I've been told I'll probably have to go over to do a job at one of the mines.
The motor I mentioned was sealed in plastic too but that had been damaged in transit and nothing done about it. I think the heaters had been powered up to begin with but hat got canned somewhere down the track when they wanted to relocate where they were stored. You can bet that the next spare always had the heaters on.The spare is vac sealed in plastic, and when here it is parked up next to a substation where the heater circuit can be hardwired to a plug to keep it dry.
I'd be pretty happy with that too.It meggered at 30 to 40 gigohms and the engineers were very happy
3.3kV mate.…what's the supply voltage?
These days many new instalations use arc flash relays that are integral with the Over Current/RCD relay but stand alone arc detection relays to use in conjunction with existing protection equipment are readily available and probably still dominate the industry. These devices are absolutely ideal for 3.3kv equipment. Some brands you are no doubt familiar with; NHP, Schneider and Eaton.I haven’t heard of arc detection as you describe,