bucket elevators basic types pitched bucket elevatorcontinuous bucket elevator conveying material...
TRANSCRIPT
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Bucket elevatorsBasic types
Pitched bucket elevator Continuous bucket elevator
Conveying materialBelt
ChainCentral chain
Round steel chain
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Bucket elevatorsBelt bucket elevators
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Bucket elevatorsChain bucket elevators
Round steel chainCentral chain
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Bucket elevatorsFeeding methods
Scoop-feeded Fly-feeded
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Bucket elevatorsDischarge methods
Centrifugal discharge Perfect discharge
Pitched
Outside discharge Inside discharge
Continuous
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Bucket elevatorsDischarge principle
Inner radius
COG radius
Outer radius
Pole distance
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Bucket elevatorsCapacity calculation
Force calculation
Speed
Sum
. re
sist
ant
coef
f.
Mat. flow
Mas
s /
met
er
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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
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Screw conveyors
Flow direction types
Material in the trough
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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?
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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)
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Screw conveyorsVertical screws
Minimal required speed of the screw
At critical speed
Above critical speed
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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
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Gravity and manual roller conveyors
- Gravity and manual roller conveyors
FixedExpandable
Accumulation of thetransported unit load
t
v
vlimit
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Powered roller conveyors
Belt
Individually-driven rollers
straight modules only
transport rollers
tensioning rollers
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Powered roller conveyors
Lineshaft
Chain Round belt
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Accessories for horizontal diversion
Turntable
Pusher
Pop-up belt
Sliding shoes
Chain transfer
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Accessories for vertical diversion
Elevator
- rope- belts
Paternoster
non-continuous
continuous
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Accessories for vertical diversion
Paternosterwith sortingfunction
Vertical spiral conveyor