First Check
Hello pectos,
as enginering student I'd do in following order (pls. skip what you already did):
1) do a full set of sketches in order to visualize all related parameters (not only some)
2) do a check of units (your formulae show different bases, e.g. h vs. min) or else the coefficients (if the formula is a adapted quantity equation)
3) check back in the engineering handbook you use, whether there's a calculation example
4) contact my professor
N.B. Crushing forces need to be high (to some extent).
???:
Your first fomula is a throughput / capacity calculation, to what aim is this added to your request?
Your shaft calculation / shaft design is not shown, so no information is available on the issues you see there.
Regards
R. ■
Out Of Spec Material
Urban waste is wide open to interpretation and the Bond Index, etc. is rarely quoted because of this.
There is are chapters on comminution in Wills, Elements of Mineral Processing, which are as good as anything, better than some manufacturers data even. Wills et al didn't give any data on 'urban waste' in my 2007 edition and certainly in my earlier copies there was no mention of that material.
I suggest you check your calculation units, as Roland says, and then surreptitiously obtain data from known manufacturers and reverse engineer the coefficients. Don't be amazed if one man's rubbish is another man's pay-dirt.
Roll crusher pressures are enormous and the shafting matches. ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Crusher Calculations
Hello, Im student of mechanical engineering. I'm desigining urban waste crusher...
Could anyone help with calculations of crush force?
Scheme:
I've counted size of roller using:
Force:
I got size of shredding roller: 0,4x1,2 [LxD=m]. literature says it should be L/D= 1/3 - 2/3.
My prob is that im getting too high force (about 2000kN, bending moment about 410000 Nm) which gives me diameter of shaft about 4m... (for C45 steel) ■