วันพฤหัสบดีที่ 13 สิงหาคม พ.ศ. 2563

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 "

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