There are several types
of grading namely:
+ Mechanical sifting:
drum sieves, star sieves, vibrating screens, oscillating sieve machines,...
By this kind of sifting the material (ballast, trash,...) is in an intake
where by the move of the sieve the material is sorted.
The material is divided in several gradings during the cycle,
it begins with the finest.
The performance affects the precision of the sifting.
+ Sifting with air:
air classifier, cyclone,...
At this kind of sifting the material (material with a high dust content)
over the construction of the filter
and is blowed with a high air flow toward the handling device of the material.
Due to the air flow the fine particles are steamed out and
collected in a dust bunker.
By regulation of the air volume and a change of the performance,
the out-sifting can be low manipulated.
+ Magnetic cleaner
Here the material to filter is transported over a conveyor.
A big electromagnet above the conveyor creates a powerful magnetic field.
Through the magnetic field all hardware from the material is advanced
and from the residual material choped.
Between the magnet and the conveyor with material is nor a short
rapid running across-conveyor which feed the sorted hardware in a
Fabrication of pellets via matrixes press
Example: Fabrication feed pellets: The raw materials are first milled to
a grist and after this in a dosing accurate mixed as recipe.
Thereafter the feed is stocked in a "Vorpresszelle".
The way of the material through the press --> holding out of the box via
mixing screw - in the mixing screw the steam is added to gain the correct
moisture and temperature of the material.
Then the feed is chased through the expander in the actual press.
Before the press the temperature and the moisture of the feed is measured
and if necessary there is again steam blowed in.
The expander transports the feed to the matrix.
Above the matrix there are running the "Kollaräder",
they are chased hydraulic on the matrix.
The feed has to run through the matrix - after the matrix there are running
the cutter, which amputate the pellets.
A visual control by the plant operator is necessary to gain a optimal product.
After the pellets have to be chilled and dryed that they don't glue.
Not till then the pellets can be camped again in a mixed feed box.
Parameter near the compression
• temperature and moisture of the materials
• bore diameter of the matrix holes - they affect the strength of the pellets (e.g. 6 mm)
• speed of the cutter after the matrix - the speed define the length of the pellets
• hydraulic pressure, with them the "Kollaräder" push on the matrix
is counted among the most importent
procedural basic operations
In the easy form are two or more components together combined
and through the inserting of flow movements with the help of the
stir instrument in such a way into each other distributed, that is reached
a consistent composition in preferably small units of volume.
There are following 4 Mixing-duties and responsibilities defined:
+ to homogenize:
Mixing of solids or into each other dissolvable liquids.
Compensation of concentrate varieties or temperature varieties.
+ to suspend:
Disposing of a disperse most heavy grained solid matter in a
liquid; e.g.: to create a sensation of crystals in a solution.
The concepts dispersion or rather disperse system denominate
the fine arrangement of a stuff in a other.
It bargains for at least two components whereupon the disperse
stuff and also the medium in which is dispersed, either attached,
fluid or gaseous.
+ warmness transfused:
change of warmness by the mixer barrier between mixture
and cloak medium. Often also conducting of the mixed warmness.
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