Bucket elevators
Basic types
Pitched bucket elevator
Continuous bucket elevator
Belt
Conveying material
Chain
Round steel chain
Central chain
Bucket elevators
Belt bucket elevators
Bucket elevators
Chain bucket elevators
Central chain
Round steel chain
Bucket elevators
Feeding methods
Scoop-feeded
Fly-feeded
Bucket elevators
Discharge methods
Pitched
Centrifugal discharge
Perfect discharge
Continuous
Outside discharge
Inside discharge
Bucket elevators
Discharge principle
Inner radius
COG radius
Outer radius
Pole distance
Bucket elevators
Force calculation
Sum. resistant coeff.
Mass / meter
Capacity calculation
Mat. flow
Speed
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 conveyors
Construction
Section A-A
Parts:
1 Trough
2 Screw
3 End bearing
4 Head bearing
5 Hanging bearing
Pushed or pulled screw?
6 Drive motor
7 Coupling
8 Gear
10 Feed opening
11 Discharge opening
Screw conveyors
Capacity 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
Required power of a horizontal screw:
P = ρhIv(Lf±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)
φ=0,125 high-density, highly abrasive material
φ=0,25 high-density, lightly abrasive material
φ=0,32 low-density, lightly abrasive material
φ=0,4-0,5 low-density, non-abrasive material
k = factor for inclined screw
For ribbon screws:
Max. allowed screw speed exists!
inclination
k factor
Screw conveyors
Vertical 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
Fixed
Expandable
v
Accumulation of the
transported unit load
vlimit
t
Powered roller conveyors
Individually-driven rollers
Belt
straight modules only
transport rollers
tensioning rollers
Powered roller conveyors
Chain
Lineshaft
Round belt
Accessories for horizontal diversion
Pusher
Chain transfer
Sliding shoes
Turntable
Pop-up belt
Accessories for vertical diversion
Elevator
- rope
- belts
non-continuous
Paternoster
continuous
Accessories for vertical diversion
Vertical spiral
conveyor
Paternoster
with sorting
function