Manufacturing press juice

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Paul
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Manufacturing press juice




by Paul » 29/08/11, 11:59

Hello,
I am building a juice press (apple) with hydraulic pressure (jack cam 15 T).
the tank is 60cm high by 43cm in diameter, it rests on a 60 / 57cm thick oak "floor" 35mm thick.
I would then like to make an iron frame capable of withstanding the pressure of the jack.
and there knowledge in tensile strength (vertical part of the frame), and in bending (horizontal part) of the iron is necessary for me to evaluate the minimum dimensions to be taken for the realization of a solid frame.
would it be better IPN, or iron in H ??
Thank you for your help.
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by the middle » 29/08/11, 12:30

Hello Pablo,
In my region, in Belgium, a craftsman presses our apples for a low price, this may also be the case in your region.
It's just an idea like that.
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by dedeleco » 29/08/11, 12:45

The pressure on this tank with 15 tonnes is around 10 Bars and does the tank withstand 10 bars (Much more than 30 tonnes on its conference (if piston sealed) and therefore the tank risks cracking at the periphery ??? ?

In my opinion, you do not need 15 tonnes by being a little patient that the apples crush with a few pounds per apple !!!

Sinon
properties of steels:
http://fr.wikipedia.org/wiki/Acier
mechanics of basic beams for calculation:
http://fr.wikipedia.org/wiki/R%C3%A9sis ... C3%A9riaux

http://fr.wikipedia.org/wiki/Th%C3%A9orie_des_poutres

For 15 tonnes you need a lot of steel and you can test on a bar that deforms and deduce its necessary size.
The small diameter allows to use not too big.

But my snitch tells me that you don't need 15 tonnes !!
Unless you want to squeeze a whole tank every minute !!!
Or extra green apples ???
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by Paul » 29/08/11, 14:50

and no, in ariege there is not, apart from Rénova, an association, but which has prices a little high for me.
It is true that 15 T is a lot, according to you would be enough? 8?
what is the pressure exerted by the screw of a press of the same dimension?
A yes while I'm at it, does anyone know the size of the mesh of the bag used? that of the Belgian craftsman for example.
Thank you so much
Paul
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beautiful photos




by Paul » 29/08/11, 17:00

and hop some photos
Image
Image
Image
Image
Image
everything is in oak, except the strapping of course, and the drain pipe (': mrgreen:')
I also read on a forum, that it was not necessary (for a pasteurizer) to use copper pipe? (it tastes) what do you think?
Stainless steel is expensive, how did they do it before?
aren't the stills made of copper? Yet it doesn't taste like copper, does it ??
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by Ahmed » 29/08/11, 21:54

For the tensile strength the profile chosen does not matter: only the section and the quality of the steel counts; two rounds of 20mm semi-hard drawn should do the trick.
For the upper part which takes a force perpendicular to the profile it is another problem. The skill seems to me to seriously triangulate the chosen profile rather than oversizing said profile (note that this is a way of transferring the tensile forces, so in a very favorable configuration).

I detail a little more to be sure of being understood:
On the center of the horizontal profile is welded a vertical profiled pillar (because it supports compressive forces); then, a tie rod welded to one end of the base profile is welded to the top of the pillar, folded * at this point to join the other end, as at the beginning.
It works like on bridges ...

Last point: the IPN profile resists this type of effort better than that in H.

* If you do not have the possibility of folding, it is equivalent to using two steel rods instead of one.
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by dedeleco » 29/08/11, 23:00

tips:
http://pressoir-d-antan-metier-d-autref ... -blog.com/
http://www.bidouilleurs.net/spip.php?rubrique9
http://www.bidouilleurs.net/spip.php?article21
http://www.bidouilleurs.net/spip.php?article20
http://www.forumfr.com/sujet385828-jus- ... ssoir.html

Example of a commercial press:
http://www.tompress.com/A-1073-pressoir ... itres.aspx

To see the structure, the force reaches a few tonnes.
Otherwise, the ratio of displacement of the end of the lever to displacement of the piston multiplied by the force exerted manually (a few tens of kilos) gives this force.
Example 1cm per turn and lever of 50 cm which runs 2x3,1416x50 = 314 times the force exerted on the lever is for 10 kilos 3,14tonnes.

It is true that 15 T is a lot, according to you would be enough? 8?

It all depends on the resistance of the fruit; but they advise to:
To squeeze apples and other fruits with firm flesh, they will need to be crushed so that the juice can be expressed using a manual or electric apple grinder.

Then the necessary force is reduced, and remains reasonable.

http://www.meilleurduchef.com/cgi/mdc/f ... 579-1278-2

how to make good cider
http://www.saosnois.com/faire_du_bon_cidre.htm
http://cyberechos.creteil.iufm.fr/cyber ... 8cidre.htm
also pasteurize:
http://www.eco-bio.info/forum/upload/to ... ommes-bio/
http://www.tompress.com/CT-2457-faire-d ... cidre.aspx
http://www.arpentnourricier.org/conserv ... urisation/
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by Paul » 25/11/11, 11:33

has by the way,
the press is finished! : Cheesy:

Image
and 15 tonnes was enough!
(its twisted the frame !!) (since reinforce ...)
allaz I girl, a +
Paul
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by chatelot16 » 25/11/11, 13:15

I discover this subject too late ... you found the right method of calculating resistance: make the point and strengthen if it bends

this method is best as long as there is nothing dangerous

note on hydraulic presses, to avoid the risk of dropping oil leaks in the juice: put the jack under the tray under the tank to be squeezed: the jack raises the entire tank: the frame around keeps the upper plate fixed

it is the classic solution of the old hydraulic press for walnut oil

Another advantage when the pressure of the jack is released, the weight of the tank makes it rise easily, and opens the press effortlessly

it is the classic solution also for wood gluing press
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