Using a scraper - a stupid question...

[hair bear]

It's christmas so please forgive me for this but of all the machines I've used and been around I've never had any dealings with scrapers.
I understand how you load it, how the hell do you empty it?
Thanks.

[Ian Fletcher1970]

Hi Rob,
There is an ejector plate at the rear of the bowl which is moved forward hydraulically or by cable operation depending on the scraper type. This pushes out the material at the front of the bowl as the apron is raised.

[hair bear]

Hi Ian,
I knew there had to be a simple answer but I couldn't fathom it! I could get the idea of sand or gravel exiting via gravity but a good load of clay would be a different matter.
Thanks for answering, and Happy New Year!
Rob.

[Deas Plant]

Hi, Hair Bear.
Happy new year.

What Ian has described is one way. (I would have sadi the scrapers were a mongrel of a thing 'cos the operator had to shovel each load out at the dump end.) How-wevver, some scrapers used combined systems to dump with the front part of the bowl floor moving back part way and an ejector pushing porward from the rear of the bowle for the rest of dump. This system was more common on elevating scraper where the elevator got in the way of the ejector moving forward far enough to completely eject the load.

Another system involved the bowl floor being on hinges that allowed it to swing up and back, usually powered by hydraulics, to allow the load to fall out thataway. Cat 633 elevating scrapers were the main ones that I have seen with this system.

One of the bigger Euclid scrapers, the S32, had another system where the floor of the bowl worked in unison with the ejector to dump the load. I have only ever seen one of these and can't remember the exact details of how it worked. Maybe someone else can chip in here.

Just my 0.02.

[jcb4cx]

my little RB has no ejector the whole bowl hinges up to discharge the load

[Mrsmackpaul]

telescopic bowls most efficent types for loading ie the bowl grows longer and the load dirt is carried back in the bowl not pushed back with the scraper as most power is used to push all the dirt back not for cutting and the bowl slides back to nothing ie no bowl floor behind the cutting edge on some scrapers the floor slides back and then back wall of the scraper slides forward and forces the load out so there is less chance of wet clay sticking hope I haven't confused the matter seeya
Paul

[hair bear]

Thanks everyone, I must make a mental note to take a closer look when the opportunity arises!
Rob.