Help needed with design

[Yashi234]

Hi all,

My name is Yashi. I am assigned to design a mechanical lifting device to lift a overhead extension cover weighing nearly a tonne. There is no power allowed as its deployable 20 ft. container. Extension is 5.6m wide by 1.5 m. Is there any pulley n winch mechanism to aid ? Any ideas ? See photo attached from supplier drawing. On right elevation, the sheet has to be cut n flap to be lifted at 117 to horizontal. When it is down, it shud be inside the width 2438mm.Feel free to ask queries.

I thought of using hydraulic Ram n actuators but was informed no power available on some site. I am thinking if we can use pulley mechanism from back that connects to top of overhead. I hv modified the container n attached screenshot of how it has to be. Please help if you know of a way to lift this. When this go down, it shud be flush with vertical or inside it, in case we use folding doors in front.

Thanks and Regards,
Yashi

 

[hydtools]

Use somthing like a boat winch.

Fulton FW32000101 F2 Two-Speed Trailer Winch with Strap - 3200 lb. Load Capacity

Ted

 

[IRstuff]

If not even battery power is allowed, then

https://www.amazon.com/Pulling-Winc...ds=4000+lb&qid=1594426750&s=industrial&sr=1-3

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

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[hydtools]

Hand crank acme screw and linkage.

Counterbalance torsion spring, Counterweight cable and pulley. Tension spring, cable and pulley. Manually open and close upper and lower closures.

Ted

 

[rb1957]

I guess I'm not understanding it. The attachment shows a typical container, with normal side opening doors.

Where's the overhead extension cover ? stowed and deployed. does it open to the side ? it's not the side of the container, is it ??

To lift it will take quite the arrangement of jack stays, to get some sort of purchase on the cover. You can lift to horizontal fairly easily … attach (temporary) booms to the cover that extend "significantly" (vertically) above the rotation axis (the top of the cover when stowed ?). A rope attached to the end should have reasonable mechanical advantage to lift the cover (but only to horizontal. Then maybe use a second set of arms mounted vertically to the far side of the container, extending above the container (so that a rope can lift the cover the rest of the way, having removed the first set of arms.

The impact of these loads on the container is probably not negligible.

Surprised you can't use a generator ?

another day in paradise, or is paradise one day closer ?

 

[IRstuff]

How heavy is the panel? I could see having some fold-up lever arms that one could attach the winch to, or just fold-up davits

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

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[LittleInch]

Yashi.

First thing. This is a professional engineering forum. Text language like "n" instead of "and" & "shud" instead of "should" needs to be avoided as it makes your post look very amateur.

Second is this lifting the flap up from the vertical side or the horizontal roof? I think it's the first.

Ok so no power but you have human power. So a manual hydraulic pump is possible here.

That angle of rotation though won't be easy.

A hydraulic or maybe a gear operated rotary actuator mounted on the hinge is needed. A spring assist would reduce loads.

That flap will also have a big wind load when it's up. Have you considered the overturning force? You really don't want it crashing down on top of someone or flipping over backwards

You could use wires but need a standoff to get the force. I'll draw something next week which should be able to be stowed away when flat.

Try looking up things like horse box doors or catering truck serving flaps.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[rb1957]

What are the space limitations for the cover ?

Are you limited to a standard container ? or can you add to the outside ?

It would be much easier to install if the cover was stowed flat on the roof of the container, then it could be "easily" slid out (translated horizontally) and then the outer edge lifted some more to give you your 63deg opening angle. But then there'd be a solid side of the container under the cover ??

Many very good point being made, about loads on the cover when open.

If you are using the side of the container as the cover, then you do realise that the container structure is heavily compromised (having an open side) and would need reinforcement.

another day in paradise, or is paradise one day closer ?

 

[mfgenggear]

to many unanswered questions,
is the lifting to install the container, or maintenance , or purpose?
does it needs to be remove from a flat bed truck to installation.
lifting a 20ft long steel container is no easy task with out power.
a special temporary over head crane will have to be assembled that can handle the load safely.
I would suggest a portable power source like a generator, for temporary installation.
that can power enough Kilowatts.

 

[LittleInch]

Do you mean something like this?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[BUGGAR]

If the guy with the beer trusts it, it's all right by me.

 

[LittleInch]

Actually coffee, and for a heavy lid you would need heavy duty spring struts, but this is a very common design.

Next time you open the back of a hatchback have a close look at the struts there.[pre][/pre]

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Tmoose]

Can you continue the extension cover shaft beyond the sides of the container?
If so an appropriately heavy counterweight could make the cover act like it weighed 10 lbs for slow motions.

Kind of like this, but "outboard" of the container to allow > 90° swing.

https://i.imgur.com/aMqtj1y.jpeg