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Design of Screw Conveyor | Size of Screw Conveyor | Screw Conveyor Capacity Calculation | Screw Conveyor Design Calculation

Design of Screw Conveyor:


01-screw conveyor-screw conveyor design-screw conveyor design calculations-screw conveyor housing- screw conveyor flights- screw conveyor formulae- screw conveyor flow rates


The size of screw conveyor depends on two factors

1. The capacity of the conveyor

2. The lump size of the material to be conveyed (Maximum dimensions of the particle)

Usually there are three ranges of lump sizes which are considered for selection of screw size. These are:

· A mixture of lumps and fines in which not more than 10% are lumps ranging from maximum size to one half of the maximum, and 90% are lumps smaller than one half of the maximum size.

· A mixture of lump and fines in which not more than 25% are lumps ranging from the maximum size to one half of the maximum, and 75% are lumps smaller than one half of the maximum size.

· A mixture of lump only in which 95% or more are lumps ranging from maximum size to one half of the maximum size and 5% or less are lumps less than one tenth of the maximum size.

The allowable size of a lump in a screw conveyor is a function of the radial clearance between the outside diameter of the central pipe and the radius of the inside of the screw trough, as well as the proportion of the lumps in the mixture.

The lump size of the material affects the selection of screw diameter which should be at least 12 times larger than the lump size of a sized material and four times larger than the largest lumps of an un-sized material.

Example, if screw diameter is 250mm means radial clearance is 105mm, & Maximum lump size is 60mm of 10% lumps.


Capacity of Screw Conveyor:


01-screw conveyor capacity calculation-screw conveyor manufacturers-screw conveyor shaft- screw conveyor capacity- screw conveyor components- screw conveyor bearings



The capacity of a screw conveyor depends on the screw diameter, screw pitch, speed of the screw and the loading efficiency of the cross sectional area of the screw. The capacity of a screw conveyor with a continuous screw:

Q = V. ρ
Q = 60. (π/4).D2.S.n.ψ.ρ.C


Where,

Q = capacity of a screw conveyor

V = Volumetric capacity in m3/Hr

ρ = Bulk density of the material, kg/m3

D = Nominal diameter of Screw in m

S = Screw pitch in m

N = RPM of screw

Ψ = Loading efficiency of the screw

C = Factor to take into account the inclination of the conveyor



Screw Pitch:

Commonly the screw pitch is taken equal to the diameter of the screw D. However it may range 0.75 – 1.0 times the diameter of the screw.





01-screw conveyor pitch- screw conveyor inlet- screw conveyor output- screw conveyor blade- screw conveyor motor


Screw Diameter:

Nominal Size DTrough height from center of screw shaft to upper edge of the troughTrough width CThickness of ToughTubular shaft (d1 * Thickness)Outside diameter of solid shaftCoupling diameter of shaft
Heavy DutyMedium DutyLight Duty
1006312021.633.7*2.53025
1257514521.633.7*2.53025
1609018053.151.642.4*2.53540
20011222053.15248.3*3.54040
25014027053.15260.3*45050
31518033553.1576.1*56050
40022442053.1576.1*56075
50028053053.1588.9*57075


RPM of Screw:

The usual range of RPM of screw is 10 to 165. It depends on the diameter of screw and the type of material (Max RPM of screw conveyor is 165)


Loading efficiency:

The value of loading efficiency should be taken large for materials which are free flowing and non abrasive, while for materials which are not free flowing and or abrasive in nature, the value should be taken low:

Ψ = 0.12 to 0.15 for abrasive material

= 0.25 to 0.3 for mildly abrasive material

= 0.4 to 0.45 for non abrasive free flowing materials


Inclination Factor:

The inclination factor C is determined by the angle of screw conveyor with the horizontal.


 Angle of screw with the horizontal10°15°20°
Value of factor C10.90.80.70.65

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