o-ring used as belts/shipping

[Gabry10]

good morning to all, in the company we have a very specific case and very particular (without precedent) in which we need to use two o-ring rings (longed), of standard size 2425 (then section 1.78 - ø int: 107.67 mm) as of conveyor belts.

I attach the design of the development of the o-ringas you can see I have two critical dimensions, the 0.44, necessary for system operation, and the winding angle of 95,6°
6.5 is the intersection between two thorns rectified by ø2.5 that lead.

we did tests between yesterday and today with what we had in stock, rings in standard nbr, but after 4 hours of continuous use they broke, of course. the load is very light, we talk about an electric scooter that turns to 30 rpm, with a pair of 1,30 nm; However the rope must be very stretched to be able to do our case, otherwise we risk not to have grip between the various pulleys and also we can not create that gap of 0.44 (which however is hypothetical too, we need minimum 2 tenths up).
realize that by calculating the internal development an o-ring from ~ø140 comes out.

Do you have any advice to give me? I would like to last at least 1 month of continuous use, 8 hours daily, 5 days on 7. what material of or more suitable could I choose? Is there anything else on the market with measures similar to 2425 which, however, is studied to convey the bike?

 

[Esselle]

ciao, forse habasit può aiutarti.
length length

 

[cacciatorino]

Does it have to be a string? Can it be a small thickness flat strap and a little more width?

 

[Focus]

try to take a look at these, they are made of polyurethane, if the bond ø1.78 can become ø2 could do to your case (I have made them work on ø much lower than the catalog limit).

 

[Gabry10]

Does it have to be a string? Can it be a small thickness flat strap and a little more width?

Unfortunately not because the or flanked also act as side banks. to understand the piece that passes on us is another round from ø2.35 and thus doing it is self-centered, in a system that then passes under a measuring laser.

seen in section is practically made so

try to take a look at these, they are made of polyurethane, if the bond ø1.78 can become ø2 could do to your case (I have made them work on ø much lower than the catalog limit).

Interesting, thank you, I'll take a tour of the catalog.

in any case whatever the solution I hoped for something standardized in prompt delivery, but the more I do research and the more I realize that even to order an o-ring in standard measure but in polyurethane you have to order it, compared to the classics in nbr or viton that also has the fishvendolo.

 

[Gabry10]

try to take a look at these, they are made of polyurethane, if the bond ø1.78 can become ø2 could do to your case (I have made them work on ø much lower than the catalog limit).

Unfortunately with ø2 I did a simulation but we practically go to touch belt with belt, resulting therefore a gap of 0

But if you tell me that it is an elastic material the right, that if stretched the diameter tends to decrease then it could do to our case. I saw that with ø2 there are different colors, with which model did you have experience?

 

[asblo]

we usually use greens in polyurethane

 

[Gabry10]

we usually use greens in polyurethaneView attachment 69315

Are those o-rings in pu or are they nate belts?

 

[asblo]

they sell them to matassa and they must be sold

 

[Focus]

Unfortunately with ø2 I did a simulation but we practically go to touch belt with belt, resulting therefore a gap of 0

But if you tell me that it is an elastic material the right, that if stretched the diameter tends to decrease then it could do to our case. I saw that with ø2 there are different colors, with which model did you have experience?

ro, orange color, hardness 83 shore a, I have never verified how much decreases the diameter by pulling it, I can tell you that I made them work even with an 8% elongation and that they weld without particular problems, better if with the appropriate equipment (in operation we sold them also with a lighter with about 70% of positive results).

 

[Diego536]

they sell them to matassa and they must be sold

I agree, use also often in the food, functional and easy to weld.
as mentioned above also provides habasit, it is called polycord.

 

[stevie]

I doubt that without an internal core of reinforcement (metal or fibrous materials) any or or or belt in simple rubber can last more than a few ten hours