Pneumatic conveying systems can be classified on different basis of consideration. These basis are listed below:
On average particle concentration (modes)
On air pressure (Types of systems)
On air supply arrangement
On solid feeder type
Of these, the first two are very important and often influence the choice of the specific design for a given material, loading and delivery condition and the distance to be covered.
The basic Principles of Pneumatic conveying stated by Great Alexander in 100 BC itself. In pre historical age Romans used Water supply pipelines and sewage disposable systems. Chinese conveyed Natural gas through Bamboo’s. These are the evidence for transporting physical objects in Pneumatic tubes.
Types of bucket elevators: Bucket elevators are classified into three types. They classified according to the bucket spacing and mode of discharge. They are: 1. Centrifugal Discharge elevators 2. Continuous Discharge elevators 3. Positive Discharge Elevators Centrifugal Discharge Elevators: In a centrifugal discharge elevator, buckets are fixed on to belt Read more…
A bucket elevator is a conveyor for carrying bulk materials in a vertical or inclined path. Bucket elevators for the mechanical, vertical transportation of materials have become a crucial link in the production process in many industrial sectors. Typical elevator consists of: 1. An endless belt, 2. A chain or Read more…
Belt Conveyors for bulk materials: Take up Arrangement: All belt conveyors require the use of some form of take up device for the following reasons: 1. To ensure adequate tension of the belt leaving the drive pulley so us to avoid any slippage of the belt. 2. To ensure proper Read more…
Selection of vibratory conveyor: The oscillating motion of the trough is achieved via specially designed inclined arms and an eccentric shaft driven by a motor through V-belts. The eccentric shaft is mounted on anti friction bearings and has V-pulleys at both ends with weights on them to counteract the unbalancing Read more…
Vibratory conveyor / Oscillating Conveyor A vibratory conveyor essentially consists of an open or closed trough or pipe, generally horizontal but not always so, and which is elastically supported on a base structure or suspended from an overhead structure by springs. The trough or pipe is caused to oscillate at Read more…
Vertical screw conveyors: A vertical screw conveyor conveys material upward in a vertical path. It requires less space than some other types of elevating conveyors. Vertical screw conveyor can handle most of the bulk materials provided there is no large lump. The maximum height is usually limited to 30m. A Read more…
Power requirement of Screw Conveyors: The driving power of the loaded screw conveyor is given by: P = PH + PN + Pst Where, PH = Power necessary for the progress of the material PN = Driving power of the screw conveyor at no load Pst = Power requirement for Read more…
Design of Screw Conveyor: The size of screw conveyor depends on two factors 1. The capacity of the conveyor 2. The lump size of the material to be conveyed (Maximum dimensions of the particle) Usually there are three ranges of lump sizes which are considered for selection of screw size. Read more…
