choice reducer

[Leo]

Good morning I have a little problem and I hope you can help me.
I have to check if the gear motor mounted on my tape is properly sized.
we mounted a motor mvf 27/f i1/20 hp 0.12 the pulley has diameter 69.5 the tape is of canvas negligible weight. We transport to maximum 5kg product the tape has interasse 1000.
are in the ball help me be good

 

[Ilario]

I moved the discussion to a more appropriate area.

Hi.

 

[MBT]

Good morning I have a little problem and I hope you can help me.
I have to check if the gear motor mounted on my tape is properly sized.
we mounted a motor mvf 27/f i1/20 hp 0.12 the pulley has diameter 69.5 the tape is of canvas negligible weight. We transport to maximum 5kg product the tape has interasse 1000.
are in the ball help me be good

We're good... others don't appreciate. . .
What do you want us to tell you? ? ?
In the meantime... operating scheme!
second. data of the reducer. a nose is an endless screw bonfiglioli.
you have to see the catalogue, calculate which pair will be necessary to move the required load and to see how oversized the reducer is and therefore what its "theoretical" life will be.

 

[Leo]

My problem, I'd better explain to myself is to calculate the required torque to move the load. I wanted to be sure that the gear motor was well sized because during the operation it heats a lot (beyond the law). My colleagues say that by hand the tape runs smoothly and does not work wrong.
will I be directed to calculate the necessary couple that formula should I use?
(for you it would seem trivial but when you are confused also what you thought was certain it is no longer.
thanks mbt for the answer

 

[MBT]

My problem, I'd better explain to myself is to calculate the required torque to move the load. I wanted to be sure that the gear motor was well sized because during the operation it heats a lot (beyond the law). My colleagues say that by hand the tape runs smoothly and does not work wrong.
will I be directed to calculate the necessary couple that formula should I use?
(for you it would seem trivial but when you are confused also what you thought was certain it is no longer.
thanks mbt for the answer

extra reason to have a pattern... .
Where does the tape stand??? on crawling guides or on a series of rollers? ?
If you already have the car in the house, do the empirical test... dynamometric key on the motor axis, instead of the reducer, and see how many nms are needed to move the load.
Watch out. the endless screw gearboxes heat already of them.
Yours has a 1:20 report, right? It's not very high, but the performance starts to fall.
check well that the reducer does not exert his own, for mounting problems. verify the current that passes in the engine with the disconnected reducer.
then verify that the installation is done well (and once again we need a design). How is it mounted? flanged, I guess from the acronym. Are concentric tolerances between the various compoents respected?? or do you have the "eccentric" reducer of a few tenths compared to the engine axis? they seem to be boiled, but they generate incredible radial loads and the reducer is affected.

 

[MBT]

small choreographic engraved. . .
You're working on plastic extrusion machines, aren't you? ? ?

 

[Leo]

View attachment nastrino.pdfI have attached the scheme I hope to have done just
Hello and thank you

 

[Focus]

Could you quantify that "beyond the law" about the temperature?

Hi.

 

[AMinati]

you have to win the torque generated by the friction of the tape that depends on the weight it weighs on, the friction coefficient between tape and support and the resistance of the tape to the winding.

the main manufacturers of rollers and belts provide the suitable calculation data and formulas!



aminati

 

[MBT]

you have to win the torque generated by the friction of the tape that depends on the weight it weighs on, the friction coefficient between tape and support and the resistance of the tape to the winding.

the main manufacturers of rollers and belts provide the suitable calculation data and formulas!



aminati

That's right.
in practice and in synthesis.
if you need to move 5 kg + 1 kg of tape.
we consider that it runs on skates (coefficient of friction... bho.. say 0.2)
force required to drag the tape = 6kg * 0.2 = 1.2 kg
torque required to the motor axis = 1.2 kg * nominal diameter pulley / 2
the diameter did not indicate it, suppose it is 200 mm, then pair = 0.12 kgm
the motor axis is turning at 70 rpm (1400 rpm motor/20 reduction ratio)
to the motor axis therefore require a power pairs to 8.6 w (given from the torque of 1.18 nm for the angular velocity of 7.33 rad/sec
we put that an endless screw reducer with i=20 yielded 0.4, you would find a motor of 21.5 w

calculations made at the coffee break...
except errors and omissions

 

[stefanobruno]

I saw your pattern and I wonder:

Why put a gearbox with a tree ( diam. 9!! ) protrude and stick in that way into another tree which will in turn be a diam. 15 or 17?
In addition you must have a perfect coaxiality between protruding shaft/cable shaft, gearbox/interfacing/head plate with internal bearing (!!)
I would have put a reducer size 30, hollow shaft diam. 14, mounted all with a reaction arm and so I would no longer need various coaxiality.

Bye.

ps. : the diameter of the roller indicated it and is 69,5 mm.

 

[MBT]

ps. : the diameter of the roller indicated it and is 69,5 mm.

ops.. I didn't notice. . .
Sorry. .

I saw your pattern and I wonder:

Why put a gearbox with a tree ( diam. 9!! ) protrude and stick in that way into another tree which will in turn be a diam. 15 or 17?
In addition you must have a perfect coaxiality between protruding shaft/cable shaft, gearbox/interfacing/head plate with internal bearing (!!)
I would have put a reducer size 30, hollow shaft diam. 14, mounted all with a reaction arm and so I would no longer need various coaxiality.

Bye.

Well, you're conceptually right, but...
mount a pendulum reducer removes the problem of the centring, but generates that of the radial load, due to the reaction of the reducer.
montages like the one proposed I have seen them many times and they are good for small sizes and precise processing.
Alternatively, you mount the reducer by crushing an elastic joint, which "digests" any disalignment. or, on slightly more bodily sizes, gearboxes with grooved profile female shaft are used.
Anyway, I agree to use the gearbox with a hollow shaft.
If, however, from what I understand, everything is already mounted... There is little to discuss.

now remains to understand how much heats.
60-70° temperatures are normal and acceptable for these types of reducer. I understand that one leans on our hand, burns and says "it's too hot". . .
you have to do a couple of tests, understand if it actually heats up and why.
In my opinion, I would do a couple of tests.
disassembled motor, turn it a little and measure with amperometric caliper the absorption of current.
mount the reducer, turn the tow without weight and see the current absorption. see after a certain period of time (at least an hour) that temperature has the reducer, using the famous drop of fat.
from them you can already see if the mounting is correct or not. if the absorptions change slightly (invitable that they change, since there are the frictions of the axes and the unloading tape) then the assembly is acceptable. temperature should also be stable. If that's not the case, there are mounting problems.
overcome the test, apply the load. check the absorptions and temperatures after the usual operating perid. if they are actually high, it may mean that the effort needed to move the load is higher than expected. and you have to go after the causes, which can be wrong calculations, wrong construction of some piece, abnormal games... but also poorly assembled reducer that behaves badly under load.

 

[Leo]

thank you so much you have been fantastic

 

[MBT]

thank you so much you have been fantastic

Thank you. But did you solve the problem? ? ?
What was that? ?