dimensioning hammer mill

[PaoloMUTZ]

Good morning to all, I am paolo m. and is the first discussion I create even if I have been following for several years cad3d.
I kindly ask you support for the sizing of a hammer mill that was commissioned for the company in which I work.
I do not ask you to solve calculations (as precise data concerning forces/masses/dimensions etc. are not yet known to me) but rather I ask you if possible to illustrate the procedures/forms to be used so as to enact a spreadsheet.

therefore:

I have to dimensional the hammer mill (photo attached), which will take care of chopping electric motors (meaning large like the fist of a hand) and to shreds of electric cables.

the system consists of a central body on which 28 free hammers are mounted (available in 4 rows). the central body rotates on its axis thanks to an electric motor.

the break of the pieces (electric motors and wires) takes place due to the effect of the cut between the hammer and the flying surface that in the photo is called "sup battente"

what sends me into trouble is how to consider the fact that hammers can rotate freely and then how to consider impacts / impacts / cut forces in play.

Does anyone have any ideas? thank you very much (good to make)

 

[biz]

I started this way (see attachment).
the centrin is the point around which your hammer is free to rotate;g is the centerpiece of the hammer; therefore the force agents apply on it.We of course have the centrifugal force and a component, which we call x, that is the force of impact, encased by the well-known formula of the amount of motion. data 0.1(s) in the absence of empirical data is conventionally adopted.

 

[PaoloMUTZ]

I started this way (see attachment).
the centrin is the point around which your hammer is free to rotate;g is the centerpiece of the hammer; therefore the force agents apply on it.We of course have the centrifugal force and a component, which we call x, that is the force of impact, encased by the well-known formula of the amount of motion. data 0.1(s) in the absence of empirical data is conventionally adopted.

ok this is clear to me and thank you, but how could we correlate it to the central body that rotates?

 

[biz]

Naturally based on its angle speed.I don't understand what is unclear.

 

[PaoloMUTZ]

Naturally based on its angle speed.I don't understand what is unclear.

Thank you for the help you're giving me.
for now I have sketched this: What do you say?

How would you continue now?

 

[biz]

I would set this up (see Annex).

 

[biz]

Thank you for the help you're giving me.
for now I have sketched this: What do you say?

How would you continue now?

attention:the mass must be multiplied by linear speed,not angular.
the tau value is tabled, you find it on each manual-text of mechanics or mechanical technology.

 

[biz]

another consideration:
_the cutting force will be increased,as the scrap is not subjected to pure cutting,it is more a "breaking" given by the shock.

 

[biz]

the difficult is to determine the force necessary to break the designated objects.

 

[TETRASTORE]

hammer mills, initially used in cement plants, ceramics, mines and gravel quarries, have extended their application to recover waste materials (biomasses, plastics, ferrous and non-ferrous, etc.

I bring back some links with material that can serve you for calculation.
improvement on the design,construction and testing of hammer mill
selection and purchasing guide of hammer crusher (manuali e formule)

hammer crusher for: imestone, slag, coke, coal, chalk, gypsum, alum, iron, non-ferrous metal, granite, quartz stone, cobblestone, etc.some technical parameters of some models (capacity, power) according to the model

 

[TETRASTORE]

This pdf document is even more detailed than the previous ones I have indicated (it is in German, but with the google translator you should be able to interpret it correctly).
drinkchnung und analysis von hammerbrechern (calculum and analysis of hammer mills)

 

[PaoloMUTZ]

thank you so much to all you have been very kind, good to make

 

[PIETRO2002]

This pdf document is even more detailed than the previous ones I have indicated (it is in German, but with the google translator you should be able to interpret it correctly).
drinkchnung und analysis von hammerbrechern (calculum and analysis of hammer mills)

really a very exhaustive thesis! to lose our heads! thanks for the link!