Electric powered hydraulic cylinder ?

[AKKAMAAN]

Aaron Z is correct in saying that these draw lots of amps. Company i work for builds DC power units and they pull 250 - 350 Amps. We do NOT make complete assemblies like what you are looking for though.

"Pulled" amps will be proportional to the load on the cyl, or the hydraulic pressure....so 250-350A will be when cylinder stalls for relif valve by pass. Just moving unloaded cyl should only take a smaller portion of the max amps......
how about using a smaller power unit, and a small size starter battery as an accumulator for the high Amps.....will need a high amp relay too....fram a starter motor.....

 

[IceStationZebra]

I just ran across one supplier of these - Kayaba out of Japan. Check out the catalog on their web page. They have models up to 2600lbs of force and 6-14" of stroke.

www-dot-kybfluidpower.com/Mini_Motion_Package.html

ISZ

 

[killdozerd11]

Hi folks,
I'm considering building a bucket grapple for my Kubota 7500 FEL and have been looking at various designs and means for powering the grapple.
One interesting thing I ran across is an "electric powered hydraulic cylinder". The neat benefits are the hydraulic circuit is all self contained and doesn't need to be tied into your tractor hydraulics, need to get a hydraulic valve, etc. The grapple direction switching is a mere DPDT switch easily mounted on your dash and the cylinder is powered off your tractor battery- no hydraulic hoses. The grapple (and video showing operation) may be seen at - Extreme Metal Products, LLC
Several questions though: 1) where do you find such "electric powered hydraulic cylinders" ? 2) what are the drawbacks to them over a regular hydraulic cylinder ? 2) Are they significantly weaker than a regular hydraulic cylinder ? When watching the demo video it is hard to see how much "crunching" or "gripping" power the grapple is capable of exerting when closing down on a pile of brush.
Especially I'd like to know some sources of these electric powered hydraulic cylinders to read up on them.
Thanks for any input.

Bob

I watched the video and for a home owner it might be ok but for serious work i don't know.The guy was going slow for the demonstration but it didn't seem fast or powerful

You can use an electrical servo valve to control the hydraulics for the grapple or thumb

the only other electrical hydraulic system i am familiar with is a unit that has a tank and a pump run with an electric motor they are used for presses
and benders,punches and lifting and holding devices.
they are mostly low GPM pumps so are not very fast in general.

 

[tommu56]

google

electric linear actuators

305,000 hits

Linear Actuators, Linear Motors, Micro motors, Electric Motors

Warner Electric New Products

a couple that I'm familiar with

tom

 

[Gary Fowler]

I cant imagine a battery powered pump putting out a lot of gallons per minute. Even the 120 volt ones I have seen are really slow. I would bet that this 12 volt one would be so slow that you would be impatient to wait for it to close the grapple especially if it developed 1500-2000 psi pressures.

 

[bcarwell]

I hear y'all about the amount of power being suspect. But the grapple I saw it on (at the website I noted) was priced at $1200+. If it is weak I'm sure they're gonna have a lot of mighty disappointed customers ! The only other place I'd seen them was in marine applications but that was just to open some pissant hatches and other light work. They sure seemed nifty though and perhaps I'll keep it in mind for other applications. And I never did cost it out versus conventional hydraulic cylinders.

Bob

 

[bcarwell]

Tommu56- it looks like those (Warner, etc.) are just electrically driven linear actuators with worm gears or whatever. The one I'm talking about is electro-HYDRAULIC. It's the "hydraulic" that caught my eye unless its false advertising. I wondered how on earth they could fit an electrically driven hydraulic pump, fluid, etc. all in the space of what looked like a regular hydraulic cylinderer. Still don't know how these things work and what's in them. Maybe there's info at Kayaba. Thanks for the hotlinks though as I'm sure I'll need an electrical actuator some day too...