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Bucket elevators Basic types Pitched bucket elevatorContinuous bucket elevator Conveying material Belt Chain Central chain Round steel chain.

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Presentation on theme: "Bucket elevators Basic types Pitched bucket elevatorContinuous bucket elevator Conveying material Belt Chain Central chain Round steel chain."— Presentation transcript:

1 Bucket elevators Basic types Pitched bucket elevatorContinuous bucket elevator Conveying material Belt Chain Central chain Round steel chain

2 Bucket elevators Belt bucket elevators

3 Bucket elevators Chain bucket elevators Round steel chain Central chain

4 Bucket elevators Feeding methods Scoop-feededFly-feeded

5 Bucket elevators Discharge methods Centrifugal dischargePerfect discharge Pitched Outside dischargeInside discharge Continuous

6 Bucket elevators Discharge principle Inner radius COG radius Outer radius Pole distance

7 Bucket elevators Capacity calculation Force calculation Speed Sum. resistant coeff. Mat. flow Mass / meter

8 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

9 Screw conveyors Flow direction types Material in the trough

10 Screw conveyors Construction Section A-A Parts: 1 Trough 2 Screw 3 End bearing 4 Head bearing 5 Hanging bearing 6 Drive motor 7 Coupling 8 Gear 10 Feed opening 11 Discharge opening Pushed or pulled screw?

11 Screw conveyors Capacity of a horizontal screw: Capacity in m 3 /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 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 inclination k factor For ribbon screws: Required power of a horizontal screw: Max. allowed screw speed exists! P = ρ h  I v  (L  f±H) in W ρ h = Bulk density I v = 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)

12 Screw conveyors Vertical screws Minimal required speed of the screw At critical speed Above critical speed

13 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

14 Gravity and manual roller conveyors - Gravity and manual roller conveyors Fixed Expandable Accumulation of the transported unit load t v v limit

15 Powered roller conveyors Belt Individually-driven rollers straight modules only transport rollers tensioning rollers

16 Powered roller conveyors Lineshaft ChainRound belt

17 Accessories for horizontal diversion Turntable Pusher Pop-up belt Sliding shoes Chain transfer

18 Accessories for vertical diversion Elevator - rope - belts Paternoster non-continuous continuous

19 Accessories for vertical diversion Paternoster with sorting function Vertical spiral conveyor


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