bucket elevators basic types pitched bucket elevatorcontinuous bucket elevator conveying material...
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Bucket elevatorsBasic types
Pitched bucket elevator Continuous bucket elevator
Conveying materialBelt
ChainCentral chain
Round steel chain
Bucket elevatorsBelt bucket elevators
Bucket elevatorsChain bucket elevators
Round steel chainCentral chain
Bucket elevatorsFeeding methods
Scoop-feeded Fly-feeded
Bucket elevatorsDischarge methods
Centrifugal discharge Perfect discharge
Pitched
Outside discharge Inside discharge
Continuous
Bucket elevatorsDischarge principle
Inner radius
COG radius
Outer radius
Pole distance
Bucket elevatorsCapacity calculation
Force calculation
Speed
Sum
. re
sist
ant
coef
f.
Mat. flow
Mas
s /
met
er
Screw conveyors
Transported materials: material not sensitive to the crunching effect of the screw (ashes, chemicals, fertilizers, food products, meal, ores, paper pulp, salt, sand...)
Screw types
Screw conveyors
Flow direction types
Material in the trough
Screw conveyorsConstruction
Section A-A
Parts:1 Trough2 Screw3 End bearing4 Head bearing5 Hanging bearing
6 Drive motor7 Coupling8 Gear10 Feed opening11 Discharge opening
Pushed or pulled screw?
Screw conveyorsCapacity of a horizontal screw:
Capacity in m3/h
Diameter of the screw in m
Screw pitch in m
Speed of screw in 1/min
Fill factor
φ=0,125 high-density, highly abrasive materialφ=0,25 high-density, lightly abrasive materialφ=0,32 low-density, lightly abrasive materialφ=0,4-0,5 low-density, non-abrasive material
k = factor for inclined screw
inclination
k factor
For ribbon screws:
Required power of a horizontal screw:
Max. allowed screw speed exists!
P = ρhIv(Lf±H) in W
ρh= Bulk density
Iv= Volumetric capacity
L= Horizontal distance of start and end points
H= Height difference of start and end points
f= General resistance factor (0,3 – 4,4)
Screw conveyorsVertical screws
Minimal required speed of the screw
At critical speed
Above critical speed
Roller conveyors
Transported material:
different unit loads, such as:
- boxes- paletts- long steel or wood material- component assemblies
Classification of roller conveyors:
- Gravity roller conveyors
- Manual roller conveyors
- Powered roller conveyors
Type of roller elements:
- Rollers
- Wheels (skates)
- Balls
Gravity and manual roller conveyors
- Gravity and manual roller conveyors
FixedExpandable
Accumulation of thetransported unit load
t
v
vlimit
Powered roller conveyors
Belt
Individually-driven rollers
straight modules only
transport rollers
tensioning rollers
Powered roller conveyors
Lineshaft
Chain Round belt
Accessories for horizontal diversion
Turntable
Pusher
Pop-up belt
Sliding shoes
Chain transfer
Accessories for vertical diversion
Elevator
- rope- belts
Paternoster
non-continuous
continuous
Accessories for vertical diversion
Paternosterwith sortingfunction
Vertical spiral conveyor
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