rapid hydraulic actuation
rapid hydraulic actuation
(OP)
How can one rapidly actuate a hydraulic piston?
probably about 4500lbs,(2000kg) with a 4-6" (100-150mm) stroke distance, in .2 seconds?
I don't know if this is possible, that's why I'm asking you guys,
TIA.
probably about 4500lbs,(2000kg) with a 4-6" (100-150mm) stroke distance, in .2 seconds?
I don't know if this is possible, that's why I'm asking you guys,
TIA.





RE: rapid hydraulic actuation
Regards,
John P.
RE: rapid hydraulic actuation
Ted
RE: rapid hydraulic actuation
Ted
RE: rapid hydraulic actuation
What's a good way to stop it? I was thinking an elastomer damper since it only does it once, but if you have a more elegant method, please share.
Nick
RE: rapid hydraulic actuation
An elastomer will absorb energy and then return it to the piston, bounce with little dissipation.
Ted
RE: rapid hydraulic actuation
RE: rapid hydraulic actuation
Ted
RE: rapid hydraulic actuation
We experimented with a casing hammer and used a pilot operated check valve to uncrease the flow for the high speed movement so the control valve did not have to be so large. We had to vibration isolate the valves and use thread locker on the fitings. The acceleration was almost 1G so the housing had to weigh as much as the moving weight to keep it from jumping off the pipe.
Ed Danzer
www.danzcoinc.com
www.dehyds.com
RE: rapid hydraulic actuation
Once that is known it is easy to calculated the required cylinder diameter.
Peter Nachtwey
Delta Computer Systems
http://www.deltamotion.com
RE: rapid hydraulic actuation
The simplistic answer to how one can rapidly actuate a piston is to push it hard.
Ted
RE: rapid hydraulic actuation
instead of pushing it open, how about spring force dumping it closed?
RE: rapid hydraulic actuation
Then the net FORCE required must not only accelerate the load but it must compress the spring.
The answer is that engrnick's application is possible depending on how much money engrnick wants to spend.
Peter Nachtwey
Delta Computer Systems
http://www.deltamotion.com
RE: rapid hydraulic actuation
Force (4500) = area X pressure
volume = area X stroke (5)
time (0.2) = volume / flow
RE: rapid hydraulic actuation
good questions:
Cyclic: used once, then retracted at a slower rate than the opening. it will be inspected/serviced after that.
orientation: upwards.
how rapidly: to actuate within .2 seconds, and to 4-6" extension.
This is for a proposal. If we can get this concept to work, I'll get an expert to design this hydraulic circuit.
Thanks everyone!
RE: rapid hydraulic actuation
[quote=hydroman247]
If you like PNachtwey's debates, have a read of the "flow makes things go" and the whole pressure is resistance to flow threads on the fluid power forum.
[/quote]
Below is an example of why I challenge all the "flow makes it go" people. They design systems that don't work and in general give hydraulics a bad name.
Wrong! Very Wrong. Even if the orientation was horizontal.
Perhaps, this thread should be in the mechanical area. If one used a heavy spring that exerted 4500 lbs at 6 inches or full stroke and would exert enough force to accelerate the load from 0 to 6 inches when compress in 0.2 seconds then all one would need to do is use the hydraulic to push down the springs and the load to 'cock' the system and release the oil to let the spring push the load up. This would require calculating the right spring constant and that wouldn't be too hard. I have know idea if springs of a specific spring constant and size are available though. It would be simple.
Peter Nachtwey
Delta Computer Systems
http://www.deltamotion.com