quick release: how to achieve it?

[Messerschmitt]

I press that I just started studying this problem, so I need more than just an idea about how to make this mechanism work.
I need to unleash a hanging object suddenly, moving on vertical guides and weighing about 2 tons.
This release system must also work in the absence of electricity, because when this is missing this object should be released automatically.
the first idea that came to me is a pin, supporting the weight, which is paraded by a hole through a pneumatic cylinder connected to a control unit, with normally open solenoid valve, kept closed feeding it. If the current is missing, the valve goes unloaded, the cylinder receives pressure and parades the pin. What do you say? I have some doubts about the materials to use and the possibility that the pin remains framed.
I also wondered if maybe, on the market, there is some quick release mechanism that could be suitable for purpose. Are you aware of this?
I remain waiting to hear your ideas and opinions. :biggrin:

 

[meccanicamg]

Hello messerschmitt,
If you have a 2t load suspended and you have to make a quick release I don't think it is convenient to act directly on the support pin as the strength to win is very high.

it would take a few lever mechanism, to command with little force... I think about it and then I tell you:

the first one that comes to mind is an electromagnetic hook....via the current....via the magnetic force

 

[meccanicamg]

other idea: if the mass is commanded on the vertical axis up and down from a winch with brake motor, you could change the logic of the brake. therefore in the absence of current instead of keeping the brake, it is released, the rope drops and the load as well.

(But if you give us some details about what those two tons of stuff are.... Maybe we find a better solution)

 

[cesius79]

Hello messerschmitt,
If you have a 2t load suspended and you have to make a quick release I don't think it is convenient to act directly on the support pin as the strength to win is very high.

it would take a few lever mechanism, to command with little force... I think about it and then I tell you:

the first one that comes to mind is an electromagnetic hook....via the current....via the magnetic force

mhhh too much energy consumption!! to maintain the magnetic seal you must always send current--->bolletta enel high

 

[Messerschmitt]

the object is a paratoia that is lifted by a screw manoeuvre mechanism.
Let's say the ideal would go to an oleodynamic system... Just open an electrovalve. But I think they don't want this system!

 

[cesius79]

the object is a paratoia that is lifted by a screw manoeuvre mechanism.
Let's say the ideal would go to an oleodynamic system... Just open an electrovalve. But I think they don't want this system!

Why don't you do a sketch with paint? Oleodynamics attracts me more as an idea..

 

[Messerschmitt]

mhhh too much energy consumption!! to maintain the magnetic seal you must always send current--->bolletta enel high

That wouldn't be a problem. We say that electricity has plenty of it.

Why don't you do a sketch with paint? Oleodynamics attracts me more as an idea..

The oleodynamic system doesn't want it. By the way, we'd know how to do it.
for the design I will see to make one shortly.. .

 

[cesius79]

That wouldn't be a problem. We say that electricity has plenty of it.

aaaaaaaaaarrrrrrrrrrrrrrrgh...the energy is the big problem today...we technicians are the ones that we must first care not to throw it!! ! !

 

[Er Presidente]

the object is a paratoia that is lifted by a screw manoeuvre mechanism.
Let's say the ideal would go to an oleodynamic system... Just open an electrovalve. But I think they don't want this system!

rack?

What doesn't like the current stain?

 

[Exatem]

but the fall must be free? or must be a controlled descent, braked.

 

[sampom]

the object is a paratoia that is lifted by a screw manoeuvre mechanism.

You should post a pattern,
because so in the ear I can not see the utility and safety of dropping and dropping a serious in the vacuum:biggrin: (which then on condition restored would appear the problem of recovering and reconnecting the bulkhead.. You should explain better).
then if the maneuver is to screw I should see what is the coupling screw / madrevite and if it is possible to unleash the bulkhead from that system.. always thinking that later it will be to be resumed.

greetings
Mar

 

[sampom]

rack?

What doesn't like the current stain?

Here.
but how is the current system?

greetings
Mar

 

[Er Presidente]

two vertical guides, central rack, gear driven by hydraulic motor with spring block arpionism.
counterweight of 1900 kg (2100 if you want to prioritize the opening), system of valves to the hydraulic motor for closing "frenata".
emergency release of arpionism with mechanical command.

normally opens and closes with hydraulic control, if needed closes by gravity with controlled descent.

Then it depends on what you have to do.

Hi.

 

[Er Presidente]

then if you want to do the "bottom", just untie the counterweight!
:biggrin:

 

[gerod]

A sketch?
So we get better?

 

[meccanicamg]

We need a scheme. However the solution of Mr President could be the best solution. the classic system controlled with the counterweight, useful force of low shift and release system in closed position.

 

[Messerschmitt]

thanks for the many answers!
you have identified many critical points of the problem, but more or less I already know how to solve them. I ask you to focus if possible only on the release mechanism, because it is a critical part and must be very reliable. I wonder, by the way... but will there be something on the market that can serve the purpose?
I'm sorry I couldn't give you a pattern, but now I'm very in a hurry. Take some patience.. .

 

[Attilone1]

Like those used in the aerospace :biggrin: :biggrin:, except for the jokes I think.

 

[meccanicamg]

I would say that a good arpionism with electric coil control lever used as safety brakes for lifts could go more than well. a designer of elevators would need to have the detail.

what I found is a photo of a project realized by the University of Padua... The only thing is to make it work with a not logic.

a manufacturer who has excellent products is mayr http://www.trasmissioni-di-potenza.com/frenidisicurezza.html

 

[meccanicamg]

an extraordinary solution, which could be applied directly to the vertical slider, without strange mechanics, without rubbing are the brakes for nexen profile guides.
http://www.scala-spa.com/file_pdf/nx/4Eyenxsin that the larger size of this catalog has 2600n of braking and it would take 8 to brake 2 tons....but if you use the counterweight system and that you make as unbalanced mass less than the maximum braking force I would say that you found the compact solution, pneumatically driven and keep moving your bulkhead with what you want: steel rope, screw and chiocchio, rack, hydraulic cylinder or pneu etc.

these venogno brakes used for a few years on some axes of numerical control machines where the high dynamic does not allow satisfactory response times with the inversion of current. for the costs I have no idea but I think they cost less than a brake for lifts and above all it seems the system that integrates better in your wallpaper structure and they already work with a right logic: if you send air 5/6 bar open, then a small lung of 5/10 liters is enough to drive the opening up to closed bulkhead.