Vibratory feeders are short conveyors used to transport bulk materials utilizing a controlled vibratory force system and gravity. The vibrations impart a combination of horizontal and vertical acceleration through tossing, hopping, or sliding-type of action to the materials being handled. Gravity counters some of the acceleration from the vibration and helps move the materials in a certain direction.Get more news about Vibration Feeder,you can vist our website!
A basic vibratory feeder consists of a trough supported by springs, hinged links, or other force-dampening mechanical components. These isolate the vibratory feeder from the structural members of the building which can cause unwanted reaction forces. Attached to the trough is a drive unit that produces high frequency, low amplitude oscillations. These oscillations are tuned to create the desired movement of the material.
A vibratory feeder is one of the many pieces of equipment designed for bulk handling. Bulk handling materials have certain properties that separate them from fluids (liquid and gas). Other equipment used for transporting bulk materials are screw conveyors, belt conveyors, apron conveyors, flight and drag conveyors, pneumatic conveyors, reciprocating plates, and so on.
Chapter 2: Overview of Bulk Material Handling
Bulk materials are dry solids that can be in powder, granular, or particle form with different sizes and densities randomly grouped to form a bulk. These materials have varied behaviors depending on temperature, humidity, time, and so on. They do not flow as easily and as predictable as liquids and gases. They can also easily degrade any equipment for conveying and handling by erosion and impingement.
In handling bulk materials, it is important to know their properties as summarized below. These properties must be determined to properly design bulk handling equipment.
Adhesion: This is the property of a material to stick or cling to another material. When being gravimetrically discharged, they tend to arc, bridge, cake, etc. while clinging onto the surface of the container. This behavior can interrupt the material flow. A debridging mechanism is needed to break this formation.
Cohesion: This is the ability of the material to attract or stick onto materials with the same chemical composition. Highly cohesive material does not flow readily as they tend to clump together.
Angle of Repose: This is the maximum angle made by the lateral side of a cone-shaped pile of falling material with the horizontal. This indicates how free-flowing a material will be. The angle of repose is particularly useful in designing feeders and conveyors relying on gravity.
Angle of Fall: This is the angle made by the slope of the cone with the horizontal after getting the angle of repose and applying an external force to collapse the cone.
Angle of Difference: This is the difference between the angle of repose and the angle of fall. The greater is the angle of difference, the greater is the free flow characteristic of the material.
Angle of Slide: This is the angle made by a flat surface containing a certain amount of material with the horizontal. This indicates the material‘s flow characteristics inside hoppers, pipes, chutes, etc.
Angle of Spatula: This is measured by taking a spatula into a heap of sample material and lifting it with maximum material coverage. The angle of spatula is the average of the angles made by the lateral sides of the material with the horizontal.
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