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Screw Feeders
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Mixers & Blenders
Bucket Elevators
Centrifugal Discharge
Continuous Discharge
Hoppers, Bins & Towers
Hoppers
Bins
Transition/Support Towers
Parts
Gates, Chutes & Diverters
Slide Gates
Diverter Gates
Spiral Letdown Chutes
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Buckets
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Engineering Guide
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Screw Conveyor Engineering Guide
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Screw Conveyor Engineering Guide
Interactive Calculator
Capacity
Horsepower
CONVEYOR CAPACITY & SPEED CALCULATION:
DESIGN CONDITIONS
SPCL. FLIGHT TYPE
– Place an “x” in the appropriate box
1.
Flowrate(m) :
lb/hr
7.
Cut Flight :
2.
Density :
8.
Cut & Folded Flt.:
3.
Loading (K) :
%
9.
Ribbon Type:
10.
Paddles per Pitch:
(0 – 4)
FLIGHT PARAMETERS
4.
Flight OD(D) :
4
6
9
10
12
14
16
18
20
24
in.
5.
Flight ID(d) :
in.
6.
Pitch(P) :
in.
CALCULATIONS
:
Shaftless Mass Flow Factor, C1
=
Spcl. Flight Type Factor, CF2
=
Flowrate (v)
=
m
=
Density
Capacity per revolution
=
0.7854 ( D² – d² ) P K 60 I C1
=
1728 CF2
Required Speed, N
=
=
rpm
Everything below is hidden on purpose
Calc.:
R =
Selection:
Cut Flight Capacity Factor,CF2 =
Cut & Folded Flight Capacity Factor,CF2 =
Ribbon Capacity Factor,CF2 =
Mixing Paddle Capacity Factor,CF2 =
Paddle FactorCF2:
CF2
calc
(PER CEMA )
Capacity
Horsepower
CONVEYOR HORSEPOWER CALCULATION:
CONVEYOR
SPECIAL FEATURES
1.
Conveyor Length(L) :
Ft
8. Paddles per Pitch :
(0 – 4)
2.
Conveyor Diameter (D):
in.
9. Flight Type :
Standard
3.
Conveyor Speed(N) :
rpm
Cut Flight
4.
Trough Loading (K) :
%
Cut & Folded
Ribbon
6.
Drive Efficiency(e) :
%
7.
Hanger Bearing Type :
Place an ‘x’ in the appropriate box
Ball, Roller or None
Hard Iron, Stellite
Arguto, Babbit, Bronze, Wood
Plastech, Nylon, Teflon,
UHMW
MATERIAL
10.
Material Factor (Fm) :
11a.
Conv. Capacity (Cw) :
Lb/Hr
– or –
11b.
Conv. Capacity (Cv) :
12
Density(W) :
CALCULATIONS :
Diameter Factor(Fd)
=
Bearing Factor(Fb)
=
Paddle Factor(Fp)
=
Spcl. Flight Factor(Ff)
=
HPf
=
L N Fd Fb
=
Fo
=
1000000
HPm
=
Cw L Ff Fm Fp
1000000
– or –
=
HPt
=
(HPf + HPm) Fo
=
HP
HPm
=
Cv W L Ff Fm Fp
e
1000000
exact :
2.03303699192
-1.44625162034
–
–
–
–
avg % diff.
Capacity
Horsepower
Torque
CONVEYOR COMPONENT TORSIONAL RATINGS:
DRIVE DATA
SHAFT DATA
1.
Motor Horsepower(HP) :
HP
8.
Shaft Diameter (D
s):
in
2.
Conveyor Speed(rpm) :
rpm
9.
Hole Diameter (d) :
in
(
/ 32 )
BOLT DATA
10.
Yield Stress (Sy) :
psi
3.
Bolt Diameter (Db) :
in
11.
Safe Stress (Ss) :
psi
4.
Bushing I.D. (Dbsh) :
in
PIPE DATA
5.
Number of Bolts (n) :
12.
Pipe O.D. (OD) :
in
6.
Yield Stress (Sy) :
psi
13.
Pipe I.D. (ID) :
in
7.
Safe Stress (Ss) :
psi
14.
Yield Stress (Sy) :
psi
15.
Safe Stress (Ss) :
psi
CALCULATIONS :
BOLTS IN SHEAR:
PIPE TORQUE RATING:
A2 =
pi x Db^2/4
Z =
pi(OD^4-ID^4)/16/OD
=
in^2
=
in^3
T =
n 2 (A2) S Dbsh /2
T =
S Z
BOLTS IN BEARING:
DRIVE SHAFT TORQUE RATING:
Torsion Only (max. distortion energy equation):
A1 =
(OD – Dbsh) x Db
=
in^2
D =
(321000 x 1.0 x HP / S / rpm)^(1/3)
=
in. (min.) @ rated stress
r =
Dbsh/2 + ( OD – Dbsh ) / 4
=
in. (min.) @ yield stress
=
in.
CEMA Method
Z =
pi x D^3/16 – dD^2/6 – d^3/6
T =
n (A1) S r
T =
S Z
Torsion Mode
Torque Rating
Yield Torque
Full Motor Torque :
(inlb)
(inlb)
Bolts In Shear:
63025 x HP
Bolts & Pipe In Bearing:
rpm
Pipe:
Drive Shaft:
inlb
MATERIAL
Grade 2 Bolts&
Grade 5 Bolts&
304 ss
316 ss
1018 Shafts
1045 Shafts
Ss
Sy
Ss
Sy
Ss
Sy
Ss
Sy
Bolt
6200 Grd. 2
35000
15500
92000
6000
30000
6000
30000
Shaft
7000
58000
8750
6000
30000
6000
30000
Pipe (bearing)
6000
30000
–
–
6000
30000
6000
30000
Pipe (shear)
6700
6000
30000
6000
30000
Pipe
ID
ID
Size
SCH 40
SCH 80
1.25
1.38
1.28
1.5
1.61
1.5
2
2.06
1.94
2.5
2.47
2.32
3
3.07
2.9
3.5
3.55
3.36
4
4.03
3.82
5
5.05
4.81
6
6.07
5.76
7
8
7.98
7.62
9
10
10.02
9.75
11
12
12
11.75
14
13.12
16
15
18
16.88
Shaft Size
Cplg. Bolts
in.
in.
1
0.375
1.5
0.5
2
0.625
2.4375
0.625
3
0.75
3.4375
0.875
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