Magnetic grid SMA


Magnetic grid SMA

The SMA type automated magnetic grid is designed for automatic removal of smallest iron contaminants from fine-grained bulk materials (granulation up to 5 mm) in free-fall systems. The magnetic grid protects process machines against damage caused by metal contamination, prevents production downtime and ensures product quality. The SMA separator also protects the consumer against eating dangerous metal pieces and is a perfect complement to a metal detector.

The SMA self-cleaning grid separator is reliable, very durable and designed for continuous operation. The grid separator consists of neodymium magnetic bars with very high magnetic field intensity and is characterized by the highest metal separation efficiency. The SMA separator enables the separation of filings, iron oxides and even slightly magnetised stainless steel. The powerful neodymium permanent magnets used in magnetic bars have high coercivity, which makes them difficult to demagnetize. Therefore, the grid separator has a long service life.

Performance features of the automated magnetic grid from Magnetix

  • Made-to-measure magnetic grid according to individual requirements.
  • Robust and durable design ensuring long service life.
  • Made with approval for the food industry.
  • Certified by the National Institute of Hygiene.
  • Separator efficiency above 99%.
  • Automatic cleaning from captured metals.
  • Simple installation in a gravity chute.
  • Inlet max. 600×500 mm.
  • Magnetic bars made of powerful neodymium magnets.
  • Magnetic flux density reaching 12 000 Gauss on magnetic bars.
  • High coercive magnetic material.
  • Dustproof grid housing made of high-quality stainless steel.
  • Working temperature up to 300°C (using samarium-cobalt magnets).
  • Optional explosion-proof design in accordance with the requirements of the ATEX directive.

Applications of the self-cleaning grid separator

  • Removal of metal contaminants with the highest efficiency from sugar, salt, flour, coffee, powdered milk, spices and other bulk food products with granulation up to 5 mm.
  • Separation of metals from grain, feed and feed additives.
  • Purification of wood chips, shavings, sawdust and wood dust.
  • Purification of grit, sand and flour.
  • Purification of plastic granulates.


Magnetic grid during operation


Versions of the magnetic grid

  • SMA-2R type magnetic separator with 2 rows of magnetic bars
  • SMA-3R type magnetic separator with 3 rows of magnetic bars
  • SMA-4R type magnetic separator with 4 rows of magnetic bars
  • SMA-EX type magnetic grid explosion-proof

Magnetic grid have rods made of powerful neodymium magnets with an operating temperature of up to 150°C or optionally samarium-cobalt magnets with an operating temperature of up to 300°C. The SMA type separator does not require any maintenance. During cleaning, magnetic cores are blown into a special chamber using compressed air. The separator is cleaned sequentially. The subsequent rows of magnets are extended one after the other at set time intervals set using a PLC programmable relay controlling the operation of the solenoid valves.


Principle of operation of the magnetic grid

The contaminated product passes through the separator inlet and flows through a multi-row system of magnetic bars. Iron contaminants are attracted by the magnets and collected under the cover tubes, while the purified product leaves the separator through the outlet. During the cleaning phase, the magnets located in the cover tubes are blown into the cleaning chamber with compressed air. The captured iron contaminants are moved behind the magnets to the splitter, where they fall into the chute for contaminants.

The cleaning of the separator is carried out sequentially. The magnets rows are sliding out one after another in the set intervals by the PLC relay controlling operation of the solenoid valves.

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