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MANUAL OVERHEAD SUSPENSION MAGNETS

A MANUAL OVERHEAD SUSPENSION MAGNET

A manual overhead suspension permanent (MP) or electromagnetic (EMP) magnet is static equipment for iron separation from a waste flow of inert material. It is installed in crushing and/or grinding plants in order to extract Fe intrusions that could damage other machineries. 

Unlike self-cleaning overband separators, we recommend opting for a manual overhead suspension magnet in case of smaller quantities of Fe intrusions in the process material. 

An iron-remover, either self-cleaning or manual, is used in the first stage of refining the process material such as glass, wood, plastic, post-combustion slag, USW, OFMSW, etc.  

HOW IS IT MADE

A manual overhead suspension magnet is basically an entirely magnetized parallelepiped. The dimensions of the magnetic plate vary according to the dimensions of the conveying system (conveyor belt, vibrating feeder, etc.) above which it will be installed. 

Depending on the customer’s requests and separation needs, the inductor circuit can be enclosed into a carpentry case sealed with a non-magnetic steel plate.

separatore magnetico a piastra
separatore magnetico a piastra

HOW DOES A MANUAL OVERHEAD SUSPENSION MAGNET WORK

Manual overhead suspension magnets do not require electrical energy for functioning. Unless subjected to strong mechanical or thermal stress, MP or EMP magnets are permanently active and last about 20 years. They function just as an overband magnetic separator: the ferrous intrusions are attracted and held against the magnetized side of the plate. Unlike overband magnetic separators, these magnets are not self-cleaning. For this reason, the ferrous parts are to be removed manually by an operator.

The electromagnetic plate is supplied with Direct Current (DC). In order to switch from the single-phase/three-phase voltage to an Alternative Current (AC) power supply, the separator requires an electrical panel which can be remotely operated. To facilitate the removal of Fe intrusions attracted to the underside of the magnet, the separator is swung away from the supply area.  

Manual overhead suspension permanent (MP) or electromagnetic (EMP) magnets can be installed:

  1. In suspension over a conveyor belt or vibrating feeder;
  2. In suspension over the discharge point of the conveyor system;
  3. As a chute magnet on which waste material streams in free-fall;
  4. Inside pipes or pipelines.

TYPES OF MANUAL OVERHEAD SUSPENSION MAGNETS

Depending on the customer’s separation needs, a manual overhead suspension magnet can be built using:

  • Ferrite magnets: they offer a greater depth of field allowing an optimal extraction at larger distances from the conveyor belt below. This option is preferred when the separator is installed in suspension;
  • Neodymium magnets: they are much more powerful than Ferrite magnets and work at shorter distances from the conveyor belt. 

A manual overhead suspension electromagnetic magnet (EMP) ensures the right mix between the benefits of Ferrite and Neodymium, but at a higher cost of investment as electricity is involved.

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