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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Sat, 10 Sep 2005 15:48:37 GMT
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Viewed:
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3727 times
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In lugnet.technic, Nathan Bell wrote:
> Does anyone know where I can find some good pictures/diagrams on how scrapers
> work?
I have a book "How Things Work" ISBN 0-75254-078-5, that shows a scraper (the
one that collects the earth rather than just pushing it to one side like a
grader).
A grader is quite simple, with the front pair of wheels on top of the ungraded
earth, a vertically adjustable diagonal grading implement and four wheels on the
graded earth, with the cab on top. See the alternative model of 850 Fork Lift
Truck. http://www.hccamsterdam.nl/brick/setlist/index.htm
A scraper has 4 wheels with the cab at the front and a large pivot behind the
cab. It has a 16-cylinder front engine and a less-powerful rear engine. The
basin carries the load of soil. The cutting edge cuts 300mm into the ground,
curling the soil up like butter on a knife. The scraper is raised and lowered
by a crane-like arm just next to the steering pivot. The Apron is a metal flap
above the cutting edge that keeps the soil in the basin. There is an Ejector (a
bit like a bulldozer blade) at the back of the basin that dumps the load by
pushing the soil forwards, forcing it through a gap between the cutting edge and
the apron when the apron is raised.
The book says that 2 scrapers are often coupled together and that the back is
strengthened so that a bulldozer can push them out when they get stuck! The
machine is 15m long, 3.4m wide and weighs 87 tons.
Sometimes these big kids' books from discount bookstores can be useful!
I agree that a diagram is needed :-)
Mark
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Message is in Reply To:
 | | Scrapers
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| Does anyone know where I can find some good pictures/diagrams on how scrapers work? (19 years ago, 10-Sep-05, to lugnet.technic)
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