Example of Vertical Screw Conveyor calculation

Calculation of Vertical screw conveyor to Khun Hoon Hamw

1

General Arrangement and bulk material

1.1

Height of the screw conveyor

7.5

m ,

24.6063

ft

1.2

Diameter

0.4

m ,

16

in

Assumed to STD size

1.3

Bulk material

Earth

2700

kg/m³ ,

168.56

lb/ft³

1.4

The maximum lump size of material

5

cm ,

2

in

1.5

The capacity of the conveyor

1

TPH

2204.62

lb/hr

2

Calculation of the vertical screw conveyor

From Table 7-1, 16" Size screw rpm shouldn't over 230 rpm

The basic HP formula is

HP

=

(HPf+HPv)/0.9

----------------(1)

When ;

HPf

=

Drive empty conveyor horsepower

HPv

=

Material convey due to vertical

Where ;

HPf

=

L1NFdFb/1000000

------------------------------------------------------(2)

And,

HPv

=

CLWFv/1000000

------------------------------------------------------(3)

and where:

L1

=

Length of vertical screw conveyor

N

=

Speed of the flight shaft

Fd

=

Screw diameter factor

Fb

=

Hanger bearing factor

L

=

Total lift height

C

=

Capacity

Fv

=

Empirical factor

From (2)

HPf

=

(24.6063)(135)(106)(1.7)/1000000

=

0.598597

Hp

From (3)

HPv

=

(2204.62)(24.3)(168.56)(1.1)/1000000

=

9.924252

Hp

Sub into (1)

HP

=

11.69206

Hp

Final drive, Chain

=

HP/0.93

=

12.5721

Hp

------------------------------------------------------ ANS

3

Calculation's conclusion

3.1

Drive: Top drive with perpendicular chain and sprocket

3.2

RPM of the shaft: 135 rpm *

3.3

Horsepower required: 12.6 Hp

3.4

Hanger bearing material: Ball bearing, Brass

3.5

Pitch flight: Short pitch

3.6

Flight clearance: 1/4 "