Linear actuator for hydraulic application

dyel1500 · Jul 15, 2022

I'm looking for some type of linear actuator that can handle a light load (~200lbs force max), with variable stroke (0-6") [increments aren't super important, 1/2" would still be fine], that can actuate and reverse in rapid succession (needs to make full 6" stroke within 1 second) for up to an hour.

Attempting to make a pulsatile hydraulic motor for part testing.

If anyone is aware of where to start the search or knows of suppliers please let me know.

Bonus points if you can find one thst operates on 120v.

adammil1 · Jul 16, 2022

Why hydraulic? I think the electrical actuators are quite more advanced in the cost/performance range. Also you don't mention much about repeatibilty with positioning. I assume not accurate means a wide range?

We do a lot of work with aircraft hydraulic actuators and with a $50,000 servo valve they position very well. Even the cheaper nonflight certified servo valves will still typically set you back $4-5k for a used one. They'll position with the right controllers to within 0.001" all day long. I am not sure what's on the market for cheap positioning with hydraulics as all we ever use is the good stuff. I am kind of curious too.

jstolaruk · Aug 16, 2022

Google "Servo Press". I've integrated mostly Promess units for assembly applications. The only hydraulic systems I do now are for broaches.

The hydraulic option would be expensive trying to get that velocity-distance and because of the duty cycle over time, the amount of heat generated would require an expensive chiller (unless your facility has chilled water) to pull the heat out of the pump's tank.

Strostkovy · Aug 17, 2022

How harsh does the reversal need to be? If incredibly harsh you could use a gear pump and regular hydraulic valves controlled by limit switch on a moveable rail.
If it can be gentle then a simple 120rpm rotating disk with holes at varying diameter for a crank would be the easiest.

Strostkovy · Aug 17, 2022

For hydraulics if you go surplus you can get 1" bore by 6" length cylinders cheap enough. I calculate needing around 2.2gpm at around 300psi which is around 1/2 horsepower. A 1750rpm motor turning a 0.3 cubic inch per revolution gear pump will do that. Basically any solenoid can handle several gpm at 3000 psi or more, so I think it should survive for a while.
I'd just use a basic relay toggle with a lmicroswitch or optical flag switch at each end of the stroke. Probably costs a few hundred dollars all in but I rarely work with hydraulics this small.

DanielG · Aug 20, 2022

Have you considered a 60rpm gearmotor with an adjustable throw crank?

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