Mechanical Engineering

Yeah, once upon a time I designed a actuating arm to move a frac'ing lines between different well heads in ND using Hydraulic Rams. First and only time I did it commercially, and not sure if I did it "right", but it did work. I'm sure there is a better way but this is what I did: ( you need a lot more information).

First off, spec's on the pistons. Pressure Area, stroke length and working pressure are the bare minimum. Alternatively they may give the working load, stroke length and working pressure rating.

Once you have how much force you can apply the rest in just free body diagrams. Easy to do, but an accurate model requires weights and center of gravities for all important bodies. Calculate the Force that is applied to the piston to remain steady state at both end conditions and a few in between and make sure your pistons can handle it. I would also put a working safety of 1.5-2.0 on the expected load so I could make sure that the pistons weren't underpowered.

Again, not a fluid power engineer, but the system I built did/does still work in Williston.

Ciao Angelo

Scua il mio pessimo inglese...non ho capito esattamente cosa ti serve...fammi sapere che ti aiuto :-)

"Qualcosina" di idraulica lo mastico

Angelo,

I may be able to help you. Is the cylinder being used for positioning only or will it be used for maintaining the rotated position too(SF consideration)? Single or dual cylinders setup? assembly to be moved weight, CG, friction(if bearing, specify rotating shaft dia, bearing dia& type). and center distance between bearing and load point)

dimension for the cylinder's entended and retracted positons (dim provided not clear, Eccentricity between cg and axis of rotation?)

Hi Thomas !

I have got some informations about hydraulic cylinder :

Bore : 125 mm Rod : 70 mm Stroke : 150 bar

Total weight to tilt : About 2300 kg

The scheme of tilter is showned on the images already posted,

I know it's not easy to calculate the forces applied in order to tilt the structure because we have to analyze center of gravity and angles.

I m interested to have some technical sheet to see how  forces can move my tilter.

I hope it's all clear

Thanks for your any further information you can send me.

Hi Irving

Thank you for your answer!

I try to give you some other informations you requested to help me. . Cylinder features are the following:

Double acting

Bore : 125 mm Rod 70 mm Stroke : 500 mm

Working pressure 150 bar

Total weight to tilt : 2300 kg

I attach two slides extracted from 3d model with some distances.

I will send you others if you need.

bye

.

Hi Angelo,

I have read some responses to your quest. Irving Logan has articulated it well together with Thomas Larson' proposal approach.

However, I would like to inquire whether the presentation you've given above is a designed model or a picture. If it already a designed model, then we can run simulations (FEA & CFD) to ascertain the questions you've raised puting into consideration the variables and constraints given among other factors and by creating various scenarios to study it broadly.

If not, a simple design can be created/modeled considering the above given factors and then run simulations as stated above.

Regards

Hi Alfayo

thank you for your answer!

Well, slides attached are extracted from a 3d model designed with Inventor, but at the moment I have not this model in my hand, the approach to calculation by means of FEA it's a good solution for sure !

Anyway I'm trying to resolve calculations with traditional system. . .relevant of 2D views. . .

1. another thing to look at is the resistance of the cylinder to buckling at full extension.
2. make sure you look at using orifice-checks to keep the load from falling in instance of a hydraulic line rupture
3. watch out for the coil tilter structures torsional stiffness. if you are using a cylinder on one side, the effort of raising the mass could induce a lot of torsion which could cause issues with the device and incur additional resistance to movement (binding up)