Dirt screed

[Rio_Grande]

I need to build a dirt screed. I understand the basics, but I need some insight on the vibration mechanism and on the angle to set the screed at.


Any help would be great!

 

[jenkinsph]

I am on the look out for a vibratory shaker used for screens on oil drilling rigs. These are about 4 to 5' long and have an enclosed eccentric shaft which spins and sets up the vibration. My plan is to hook this up to my rock bucket and run it with a hydraulic motor using the third fel circuit. Have to build the suspension mounting for the bucket also.

If you wan't a vibrating screed to use stationary you could use an electric motor to run it. I would prefer to make the screed angle adjustable as there isn't a perfect setting as it is dependent on your particular soil and rocks. A little trial and error will help you find the right pitch that works for you. Something like a trailer screw jack would work well for this adjustment.

 

[Rio_Grande]

That makes sense!

 

[smiley]

If you wan't a vibrating screed to use stationary you could use an electric motor to run it. I would prefer to make the screed angle adjustable as there isn't a perfect setting as it is dependent on your particular soil and rocks. A little trial and error will help you find the right pitch that works for you. Something like a trailer screw jack would work well for this adjustment.

They also make 12 volt vibratory shakers for dump truck boxes to rattle out the dirt that might be worth looking at.

 

[Arc weld]

I don't think a 12 volt vibrator from a dump truck would be good for continuous duty. Years ago I saw a homemade screen on a much bigger scale. It had it's own power plant with a hyd. motor for the shaker. The shaker sat on 4 big coil springs from car or truck. The hyd. motor was coupled to a shaft that ran across the shaker under the screen material. It used a weight on one side of the shaft to throw it out of balance and it could be adjusted by the hyd. flow or engine RPM. I think they experimented with how much weight to use and ended up using a smaller weight than they original thought they'd need.

 

[Rio_Grande]

How much of a cam would I need for a 4x 8 bed?

 

[BukitCase]

Here's some food for thought...

http://www.tractorbynet.com/forums/build-yourself/119273-screening-plant-project.html

Fair amount of info there... Steve

 

[smiley]

I don't think a 12 volt vibrator from a dump truck would be good for continuous duty.

That's probably true as I hadn't thought about continuous duty. I was thinking more along the line if someone just wanting a load now and then.
The big ones we had at the quarrys and gravel pits were as you described ---

QUOTE["The shaker sat on 4 big coil springs from car or truck. The hyd. motor was coupled to a shaft that ran across the shaker under the screen material. It used a weight on one side of the shaft to throw it out of balance and it could be adjusted by the hyd. flow or engine RPM"]QUOTE

I never remember a problem with the shakers as long as they're greased. The major problem is screens wearing thin, then big rocks blowing holes through them and occasionally they would break a spring.