180¦ Air Powered Hinge Assembly
180¦ Air Powered Hinge Assembly
(OP)
My problem is the one beam has to flip on top using some sort of air or air/hydraulic a full 180° and then come back extended.
-The point of rotation is above the two beams
-when flipped the cylinder can not extend past the end of
the assembly. The point of flipping is to save length
for transport.
-The total weight of the extend moving part is 3,000#'s
distributed.
My question is what should I use for force, the beam can not slam up and down it may kill someone if it does. I have 120psi of air in that location and customer requires it be air powered.
What location should the points be to make the assembly rotate using a non cycling cylinder. As in when extended it must be flipped on top and when retracted it must be extended.

Thank you,
Jeff
-The point of rotation is above the two beams
-when flipped the cylinder can not extend past the end of
the assembly. The point of flipping is to save length
for transport.
-The total weight of the extend moving part is 3,000#'s
distributed.
My question is what should I use for force, the beam can not slam up and down it may kill someone if it does. I have 120psi of air in that location and customer requires it be air powered.
What location should the points be to make the assembly rotate using a non cycling cylinder. As in when extended it must be flipped on top and when retracted it must be extended.

Thank you,
Jeff





RE: 180¦ Air Powered Hinge Assembly
Can you mount the cylinder vertical?if so you can then use
a bell crank lever to achieve what you require.
desertfox
RE: 180¦ Air Powered Hinge Assembly
http://ww
RE: 180¦ Air Powered Hinge Assembly
http://www.phdinc.com/products/default.asp?id=1
RE: 180¦ Air Powered Hinge Assembly
h
RE: 180¦ Air Powered Hinge Assembly
RE: 180¦ Air Powered Hinge Assembly
RE: 180¦ Air Powered Hinge Assembly
dvd's point is that it appears you are wanting the axis of rotation to be horizontal. That is, you're wanting to lift this 3000 lb beam from horizontal to vertical and then back down to horizontal with a single actuator. The "crossover of forces" he refers to is the fact that for half the stroke you will be pushing against gravity. As soon as you get past vertical, gravity will be pulling in the same direction as your actuator is pushing. If you are using some type of air cylinder, the compressed air that was doing the pushing will suddenly have nothing pushing back, and the 3000 lbs will come crashing down to the other side with the combined force of gravity and your air cylinder, destroying everything in its path. My opinion is that pure air is entirely out of the question. Air over oil is your only option here. And I really doubt you're going to be able to get 180 degrees of rotary motion out of a single actuation of a linear actuator without using a gear/rack mechanism.
RE: 180¦ Air Powered Hinge Assembly
RE: 180¦ Air Powered Hinge Assembly
Regards,
Mike
RE: 180¦ Air Powered Hinge Assembly
The worm gear powered by an air motor would be a great option, any clue on who would make a gear that could sustain that weight and the air motor? I would love to do electric but batteries and air flight is a problem. I think they will allow Gel Cell Optima's I will run this by them... All I would need is a gear system so I could mount the motor in a unexposed location.
Thank you for all your help so far.
RE: 180¦ Air Powered Hinge Assembly
ZCP
www.phoenix-engineer.com
RE: 180¦ Air Powered Hinge Assembly
RE: 180¦ Air Powered Hinge Assembly
The load must have momentum to pass TDC. The load will be accelerating as it moves to TDC and then decelerate to the end of stroke by exhausting air as it lays the part down.
Saw this design on a circuit somewhere in te past 40 years and it was slick. Not as heavy a part as I remember but very smooth operating.
Bud Trinkel, Fluid Power Consultant
HYDRA-PNEU CONSULTING
RE: 180¦ Air Powered Hinge Assembly
ZCP
www.phoenix-engineer.com
RE: 180¦ Air Powered Hinge Assembly
zcp, I could have it at 179°- ~135° the issue still is to spin that pin/pivot past 90° seems to require a motor or a push then pull motion.
Thank you for your help so far.
RE: 180¦ Air Powered Hinge Assembly
A 3-Way 2 Position valve would shift to prssurize the cylinder until near TDC and then it would shift to Exhaust with flow restricted to decelerate and lower the load.
I could give you a rough sketch in MSWord if there is a way post it here or I could send it directly to you. I'm at fluidpower1**@**hotmail.com
Bud Trinkel, Fluid Power Consultant
HYDRA-PNEU CONSULTING
RE: 180¦ Air Powered Hinge Assembly
RE: 180¦ Air Powered Hinge Assembly
RE: 180¦ Air Powered Hinge Assembly
RE: 180¦ Air Powered Hinge Assembly
Ted
RE: 180¦ Air Powered Hinge Assembly
Regards,
Mike
RE: 180¦ Air Powered Hinge Assembly
If so where could I get ones powerful enough yet inexpensive?
The worm gear with a crank back up how would you go about that? Tie the crank right into the gear as well?
RE: 180¦ Air Powered Hinge Assembly
Cheers
Greg Locock
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: 180¦ Air Powered Hinge Assembly
I believe I have exhausted my expertise on this subject.
Regards,
Mike