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