Bucket elevators areoften used for vertical transportation of powder, granular and small blockmaterials. The lifting height is generally less than 40m, and the conveyingvolume is not more than 1600m3/h. It has the advantages of smallcross-sectional size, compact layout, large lifting height, and good sealingperformance.
There are four commonbucket elevators: TD type, TH type, TB type and NE type. The main differencelies in the material and structure of the traction parts, as shown in thefollowing table:
Structure type | TD type | TH type | TB type | NE type |
Traction parts | Rubber belts | Endless chains | Plate sleeve roller chains | New plate sleeve roller chains |
Unloading method | Centrifugal/hybrid | Hybrid/Gravity | Gravity | Gravity |
Applicable temperature | Ordinary belt, material temperature<60℃; heat-resistant rubber belt, material temperature<200℃; | Material temperature<250℃ | Material temperature<250℃ | Material temperature<250℃ |
Lifting height | 4~40m | 4.5~40m | 5~50m | 4.5~40m |
Conveying volume | 4~238 m3/h | 35~395 m3/h | 20~563m3/h | 15~800 m3/h |
Applicable materials | Powder, granular, and small block with looseness ρ<1.5t/h without abrasive, semi-abrasive materials; | Powder, granular and small block with looseness ρ<1.5t/h, non-abrasive and semi-abrasive materials | Medium and large abrasive materials with looseness ρ<2t/h | Powdery, granular and massive abrasive materials with looseness ρ<2t/h |
The hopper of bucketelevator has different structural forms, which can be divided into deep buckettype, shallow bucket type and scale bucket type (triangular bucket ortrapezoidal bucket).
Material loadingmethods can be divided into digging type and inflow type. Digging type ismainly used for conveying powder, granular and small block non-abrasive orsemi-abrasive bulk materials. The layout of the hopper is sparse, the distancebetween two adjacent hoppers is large, and the traction speed of the tractionchain Higher, about 0.8~2m/s. The inflow type is mainly used for conveyinglarge blocky and highly abrasive materials. The hoppers are densely arranged,and the distance between two adjacent hoppers is small to prevent materialsfrom being scattered. The traction linear speed of the drag chain is low,generally less than 1m/s.
According to thecharacteristics of these common bucket elevators, the hopper type and hopperfilling factor and other parameters must be selected according to thecharacteristics of the conveyed material (including particle size, looseness,temperature, viscosity, and abrasiveness) when selecting. Determine informationsuch as the type of hoisting parts, the loading method of materials, etc.;Calculate and check the delivery volume according to the information of thehopper type and filling coefficient, and then calculate the shaft poweraccording to the information such as the lifting height, and select thespecification parameters of the drive device. Finally, determine the structureof the bucket elevator.