double split split design

[Zamparto]

Bye to all,
I searched on the forum but found nothing, so I ask here.

for the examination of construction of machines I am carrying out a project of a double scissors lift from workshop for cars, but I met some hitch. First of all, I found that the most critical point for the piston is when the lift is practically closed, and right at this point I get forces that are more than 100 kn (about 11 tons) considering that I have to lift a mass of 1500 kg. with this force, however, the pin to which the piston is connected is really too large. So I was wondering if the order of magnitude of the piston force was consistent with this type of application or I made some mistake in the equation system from which this force turns out.
I also attach photos of the lifter and how I scehmatized everything.

Thank you in advance!

 

[MassiVonWeizen]

a starting point:

Progetto sollevatore a pantografo

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Schema 3d pantografo a singola forbice

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Dimensionamento sollevatore a forbice

Chi sa aiutarmi a capire le forze e il calcolo delle forze che si vengono a creare su un sollevatore a forbice? grazie :finger:

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Piattaforma a singola forbice

Salve a tutti sono nuovo di questo forum e avrei bisogno di aiuto nella progettazione di una piattaforma di sollevamento a singola forbice. Vorrei sapere se i calcoli e le semplificazioni da me svolte sono corretti prima di iniziare a dimensionare i vari componenti grazie. Vi allego un foglio...

www.cad3d.it

 

[meccanicamg]

Just something... .
then on google there are several dispensers with forces and dispositions.
if you use solidworks you can simulate forces and do dynamic study.
If the angle is small, the lever is unfavorable....then the force rises a lot.

 

[bip]

They have already responded with a variety of discussions to get very useful information. .
If you start from a very unfavorable angle (highly aligned rotation centers), the force grows very much, up to the limit case of the cylinder aligned to the fulcrum of the system, which is a singularity and does not allow the cylinder to start the whole.. .. maybe you just have to start from a slightly different angle, to have much more reasonable pushes, even of an order of magnitude lower at times, at the price of a few centimeters lost

 

[Zamparto]

Thank you all for the answer, excuse me for the delay. I will try to move the point where the piston is hinged so that the angle that creates the latter is as large as possible.