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MayCo ERano

on 8 July 2015

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Feeders are machineries used in assembly and manufacturing applications to move or “transport” materials or products to a designated storage or to other processing equipment.

A feeder is a piece of material handling
equipment used to regulate the flow of a
bulk material from a bin or hopper.
feeder is essentially a
conveyor used for short
distances where a
constant rate of
dispersal is required.
There are many types of feeders to suit many different industries; ranging from mining, to pharmaceuticals, to agriculture. Feeders are often used in conjunction with other types of material handling equipment, like conveyors, crushers, dryers, grinders, blenders, and mixers.

There are many types of feeders available to handle bulk solids and they can be divided into two categories: volumetric and gravimetric. A volumetric feeder discharges a volume of material as a function of time while a gravimetric feeder weighs material.
Volumetric Feeding Principles

The bulk material is discharged from a hopper with a constant volume per unit of time by regulating the speed of a feeding device.The actual volume of material fed is determined through calibration. The feeding accuracy is dependent on the uniformity of the material flow characteristics and the bulk density.


Simple, economical solutions where a high degree of feed rate accuracy is not required.
Gravimetric Feeding Principles- Loss in Weight

Gravimetric feeding systems generally use a volumetric feeder associated with a weighing system to control the discharge of powder from a storage hopper at a constant weight per unit time (kg/min). The weight signal is used as a feedback control system to constantly monitor the feed rate and compensate for variations in bulk density, porosity etc.
Rotary Feeder

rotating element or vane discharges powder or granules at a predetermined rate often used with large amounts of solid material power comes from an internal combustion engine or an electrical motor

Vibratory Feeder

use both vibration and gravity to move material used to transport a large number of smaller objects uncontrolled recovery of the material from top of feeder controlled delivery of the material from bottom of feeder
Vibratory feeders are used for a wide variety of materials, including aggregate, coal, and chemicals.Essentially, a vibrating feeder is a ramp which vibrates to agitate material into falling down an incline. The vibrations spread the material evenly along the ramp, which results in a smooth discharge.
Screw Feeder

used for handling bulk materials, in which a rotating helicoid screw moves the material forward, toward and into a process unit very similar to screw conveyors in their basic structure,
both of which are based on the principles of the Archimedean screw capable of delivering dense slurries and dry granular products with great accuracy at a range of operational speeds drive is controlled by servo motors capable of precise
stop-start and speed
A screw conveyor or auger conveyor is a mechanism that uses a rotating helical screw blade, called a "flighting", usually within a tube, to move liquid or granular materials. They are used in many bulk handling industries.
Apron Feeder
allows automatic control the volume of materials that are added to a process construct is from heavy, durable materials like steel, the belt portion of the apron feeder is made from thick steel trays or pans can be found in mining operations, factories, and concrete plants cannot be used in applications where precise feeding and measuring is required
How It Works - Apron Feeder

Materials that will be carried by the apron feeder are held in a large hopper above one end of the belt. The amount of material that reaches the feeder is determined by the distance between this hopper and the top of the feeder. As the hopper deposits materials onto the apron feeder, the metal pans that make up the belt travel horizontally like a conveyor belt. When the trays reach the end of the belt, they dump, or feed the materials into another vessel.
Bowl Feeder

used to feed parts to an assembly line or piece of manufacturing equipment individual components exit the feeder at specific intervals and enter the next step in the assembly process Each bowl feeder uses special sensors to spot jams or parts that may be misaligned. one drawback is its precise operation.
How It Works
In a standard application: the bowl feeder sits below a hopper or bin workers fill the hopper with bulk material, and these objects fall into the feeder below
Belt feeders are used in lieu of apron feeders when material is of a fine composition. A belt feeder is simply a conveyor with a short belt. Typically belt feeders are less expensive than apron feeders, and operate at higher speeds. However, they not suited for heavy-duty applications.
Chain feeders are used to control the release of a bulky material within a bin. Their design consists of several heavy chains, which drape over top of the bulky material on an incline. While resting, the chains hold the material in place. When the chains are moved, material slides down the incline.
A silo is a structure for storing bulk materials. Silos are used in agriculture to store grain (see grain elevators) or fermented feed known as silage. Silos are more commonly used for bulk storage of grain, coal, cement, carbon black, woodchips, food products and sawdust.
Steel grain silos in Ralls, Texas, United States
Grain elevators are composed of groups of grain silos such as these at Port Giles, South Australia
Silos in Acatlán, Hidalgo, Mexico.
Three types of silos are in widespread use today:

tower silos
bunker silos
bag silos
Missile silos are used for the storage and launching of ballistic missiles.

The most common type of silo can be made of concrete, brick, metal, wood, and other materials loading and unloading is done with automated systems

are trenches, usually with concrete walls, covered with a plastic tarp to make it airtight automated systems for loading and unloading more low profile than tower silos better insulated
8 to 12 ft in diameter unloaded using a tractor and loader or skid-steer loader, require little capital investment, temporary measure when growth or harvest conditions require more space.

shorter than a silo used for holding dry matter shape is either round or squared contain a hollow perforated or screened central shaft
Cylindrical bowl
Conical bowl
Stepped bowl
Polyamide bowl
Cylindrical bowl

Material: Aluminium/Steel/Stainless Steel

Suitable for: Continuous transport of components and for handling small parts
Conical bowl

Material: Aluminium/Stainless Steel

Suitable for:
Heavy sharp-edged components
Larger Loads
Automatic pre-separating
Stepped bowl

Aluminium/Stainless Steel

Suitable for:
Larger loads and larger components
Polyamide bowl (conical or stepped)

Suitable for:

Small components with simple geometry and where mass production of feeders is required
Feed Storage Silo in Fish Farm
Poultry Farm Feed Storage Silo System
Rotary-vane feeders are used for low density powdered material. These units feature a rotating vane (a rotating cross with four separate quadrants). At the top of the vane rotation, each quadrant scoops up a load of material. At the bottom of the rotation, the load of material is discharge by gravity. The rate of discharge is determined by the speed at which the vane rotates.
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