# Calculate power of blending

wermix
Hello pleas i need help how to calculate needed power(of engine) for blending granual material in machine.
Machine looks like on pic below
thank you

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Mentor
Welcome to the PF.

For us to be of any help, we will need lots more information. How big is this machine? What exactly is the material being blended? How much material at a time is put into the machine? Do other similar machines exist, and if so, what size electric motor do they use?

Asymptotic and russ_watters
wermix
it have to have capacity about 600-700dm3... the material will be trash of electric components so it is hard to tell :) density is probably about 500kg/m3 at one time we put in machine about 300kg :) we have same machine but for blending coal ash and it have capacity about 40dm3 and engine power is 0.18kw

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Mentor
the material will be trash of electric components
So this is a shredder, not a blender?

wermix
nono :) it will be like homogenizator :)

Mentor
nono :) it will be like homogenizator :)
the material will be trash of electric components
Those two statements make no sense in juxtaposition, IMO. What the heck are you trying to make?

wermix
i need to make mashine what will make sample of trash to know what type of pieces i have in

wermix
so i need to blend trash :O to homogenize it :) and the take it out that is why i want to use paddles :)

Asymptotic
capacity about 40dm3 and engine power is 0.18kw
1. Does this capacity of 40dm3 mean 40 cubic decimeters?
2. Is this the amount of material than fits into the mixing/processing chamber? Or is this the volume of material that can be processed within a set period of time (i.e. - 40 dm3/hour)?

wermix
yea cubic decimeters :) and it is in one time :)so mixing all material

wermix
so i need to mixing all 300kg in one mixing process :)

Asymptotic
material will be trash of electric components
More detail, please. As you may imagine, it takes considerably more power to chew through a scrapped 10 HP induction motor than it does to process a batch of circuit boards.

russ_watters and wermix
wermix
it is brash of electric components ... it can contain everything :) but size of components is about 50x50x50mm :) as i told density of material is about 500kg/m^3

wermix
i know it is bad situation :/

Mentor
i need to make mashine what will make sample of trash to know what type of pieces i have in
so i need to blend trash :O to homogenize it :) and the take it out that is why i want to use paddles :)
If you mash up electronics circuit boards, you will destroy the components. Is that you want? Also, some components release chemicals when smashed up (like electrolytic capacitors), and those chemicals can cause other problems. What is your end goal with this "blender"?

wermix
ok it is just blender :) it is filled with trash after milling :) so i don't care about types of components :) i just need to blend mass of electric components trash (like rubber, elektric circuits, metal fragments) this trash have pieces of size about 50mm :)

Mentor
i just need to blend mass of electric components trash (like rubber, elektric circuits, metal fragments)
For what purpose? Usually you would want to separate things for recycling, not "blend" them all up.

wermix
to make homogenized sample :)

wermix
this device have split filled matterial to sample and trash :) and every piece of filled material have to have same chance to be in sample (sorry for bad neglish) O:)

Mentor
Sigh. That makes no sense. Are you an artist or something? I see no practical use for this process.

wermix
ok i need to take 60kg sample of this 300kg :) ok ? :)

wermix
rest is trash :)

Mentor
The problem with you not being very descriptive of the application is that it makes it harder for us to try to help you with suggestions and ideas. For example, the mixer you have shown will do a lot of damage to the pieces that it is mixing with its blade arrangement. And as I said, that can also release some chemicals from the mix that really should not be released.

If all you want to do is mix up some stuff to make the mix more homogeneous, then look at alternative mixing technologies that are gentler on the materials, but still do a good job of mixing things together. Consider renting something like a standard cement mixer or similar apparatus instead of using a mechanism with blades...

https://www.zoro.com/marshalltown-c...MI-seEgb-K2wIV1TaBCh05_wAMEAQYAyABEgKG6vD_BwE

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Asymptotic
wermix
ok :) it is mashine for blending electric trash (300kg) i need to take of this mashine just 50kg for sample and rest for nothing :) ... befor filling ot my machine ... electric trash is crushed destroyed smashed to pieces so i don't care about dameging it :) i just need to calculate forces on padle of this ... bulk material
... about machine this machine have 4padles .. and 6holes to take material out

Mentor
If the mixer that I posted a picture of does a good job of mixing up the "blend", can you use it instead?

Asymptotic and russ_watters
wermix
hh :D nope i think ok :D thank you for time but i just need to know how to calculate needed power to rotate paddles :D

wermix
Mentor
Is there a particular reason why it needs to be that style?

Asymptotic
berkeman
wermix
If I'm understanding your application correctly, the 'electric trash' is already 50 mm3 or smaller in size, and the paddle-based blender is to assure a homogeneous size distribution of trash particles. You may wish to re-examine this premise, because you are more likely to segregate the component particles to an even greater degree via the 'Brazil nut' effect.
https://en.wikipedia.org/wiki/Granular_convection
you are right :) almost :) but true is i don't need to segregate components i just need to make sure every part have same chance to be in sample :) and sample is going ot laboratory ...

wermix
Is there a particular reason why it needs to be that style?
this style isn't necessary but i don't have about any other style :)

Asymptotic
you are right :) almost :) but true is i don't need to segregate components i just need to make sure every part have same chance to be in sample :) and sample is going ot laboratory ...
Then a paddle blender is perhaps not a good choice.

wermix
Then a paddle blender is perhaps not a good choice.
any better idea ?

Asymptotic
any better idea ?
I'd go with @russ_watters cement mixer and see how that works out.
Edit: That is, @berkeman 's

russ_watters
wermix
so no idea how to calculate it :D