Subject:
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Re: Scrapers
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Newsgroups:
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lugnet.technic
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Date:
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Tue, 13 Sep 2005 15:53:52 GMT
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Viewed:
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7983 times
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In lugnet.technic, Mark Bellis wrote:
> In lugnet.technic, Nathan Bell wrote:
> > In lugnet.technic, Nathan Bell wrote:
> > > In lugnet.technic, Ross Crawford wrote:
> > > > In lugnet.technic, Nathan Bell wrote:
> > > > > Does anyone know where I can find some good pictures/diagrams on how scrapers
> > > > > work?
> > > >
> > > > I guess you can't really see the details in this pic:
> > > > http://www.brickshelf.com/gallery/RoscoHead/construction/Micro/lil_scraper.jpg
> > > > ;)
> > > >
> > > > There's a pretty good photo here:
> > > > http://www.machinerytrader.com/listings/forsale/detail.asp?OHID=4976697&guid=22213E5C0EAA44BFA5CD2834E223FD2A
> > > >
> > > > And some others probably too if you poke around that site. The tub is raised and
> > > > lowered using the vertical cylinders just behind the front wheels. Larger
> > > > scrapers generally have 2 engines these days, one at each end. And as Mark said,
> > > > most are generally engineered so as they can also be pushed by other equipment,
> > > > including other scrapers, very helpful especially in slippery conditions, as a
> > > > tracked vehicle pushing can get much more grip than a wheeled tractor.
> > > >
> > > > Unfortunately I don't know of any online diagrams, but it may be worth
> > > > contacting a John Deere agent for datasheets and information. I've found they're
> > > > usually happy to provide any info they have.
> > > >
> > > > ROSCO
> > >
> > > Thank you all for the pics. The one Rosco sent was the type I was looking for.
> > > There are 2 types that I can see. One has a hollow tub in the middle and
> > > collects the dirt. The other is basically the same thing but with
> > > tread-mill-type blades in front of the tub. I already have the tread mill
> > > created, but everything in between is what I need pics of. I took some
> > > yesterday and might upload them to Brickshelf.
> >
> > I forgot to thank Mark Bellis and John Fors for their info yesterday.
> >
> > Which engine drives the rotating blades? Is one engine for hydraulics and one
> > for driving the wheels? Or is one engine for the rear half and one for the
> > front? Which engine performs which functions?
> >
> > This is what I have so far- not much at all. I have 10 engine pistons, and may
> > put 6 in front and 4 in back.
> >
> > http://www.brickshelf.com/cgi-bin/gallery.cgi?f=145054
>
> The front engine has an automatic gearbox to the front wheels. Less power is
> needed in loose soils than in hard, compacted soils. I guess being such a big
> machine, it has a proper control system, such that power to each axle is
> controlled from each axle's engine with a combined traction control system.
>
> The cut-away diagrams show the brakes, but looking at the picture I suspect
> they're actually electric motors. The book says nothing about electric drive
> though. The pictures show a large cylindrical blue unit over the front axle,
> which could be a generator as the automatic gearbox arrow points somewhere else.
> This is a kids' book! An electric drive system makes sense, since this machine
> is 87 tons, less than a 130 ton diesel engine on rails, The drive to each wheel
> can be controlled electrically for individual torque requirements buch more
> simply than in a mechanical system, and also having wires between units is
> easier and more reliable than thicker hydraulic pipes or direct mechanical drive
> shafts.
>
> I suspect the front engine has the power take-off for the hydraulics since it is
> the more powerful one. A V16 is at the front with a tall radiator with 2 fans
> arranged one above the other and a large exhaust stack. The front engine is
> mostly in front of the front wheels. The rear engine isn't shown, but I suspect
> a V8 or V12 - less powerful than the front engine but enough to drive the rear
> wheels. There's no sign of an exhaust stack for that one.
>
> I suggest a V6 in front and a V4 behind, since the front engine should be short
> enough to sit in front of the wheels. The cab on this picture is to the left at
> the front, over the front curve of the left wheel arch. There's an aircon unit
> on top of it.
>
> Mark
Is it possible they have a hydraulic drive controlled by only one engine? When
the scraper bends down in the middle, it shortens the distance between the front
and rear wheels, and visa- versa. That would mean that the axles would be
turning at different speeds for a few seconds. Hydraulic drive would make this
possible.
I live around the biggest Construction project in Ohio and see scrapers in
action occasionally, so I may try to make a video. I don't remember if we can
load videos on lugnet or not. Yesterday I was referred to someone who might let
me get up close to one to take pictures and they might be able to explain how
they work.
Nathan
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Message has 2 Replies:
 | | Re: Scrapers
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| Nate- Here's a site I found with info on scrapers. (URL) (Sorry I couldn't be of much help here) (21 years ago, 13-Sep-05, to lugnet.technic)
| | | Re: Scrapers
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| (...) I've never read anything to support this supposition. I've always thought scrapers mainly use mechanical transmissions. I know Caterpillar likes to put mechanical transmissions in things where other makers only use diesel-electric. I'm sure (...) (21 years ago, 13-Sep-05, to lugnet.technic)
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Message is in Reply To:
| | Re: Scrapers
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| (...) needed in loose soils than in hard, compacted soils. I guess being such a big machine, it has a proper control system, such that power to each axle is controlled from each axle's engine with a combined traction control system. The cut-away (...) (21 years ago, 12-Sep-05, to lugnet.technic)
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