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Magnetic head pulleys

Application

A head roller magnet separates ferromagnetic particles, such as iron or steel, and even weakly magnetic particles (such as particles from processed stainless steel) from coarse to very fine fractions and carries them away completely automatically and continuously. This magnetic roller is built into an existing conveyor belt system as a head or tail roller and is a cost-effective magnetic metal separator. It is important to feed the material onto the conveyor belt with the magnetic roller in a thin layer (ideally a mono-layer).
Head roller magnets require practically no maintenance, and because these magnets are integrated in an existing installation there are almost no extra operating and energy costs.
For larger layer thickness a head roller magnet can be combined with a suspension or overbelt magnet. In this configuration the suspension magnet draws the pieces of steel out of the upper layer and the head roller magnet draws them from the lower layers of the bulk flow.

Magnetic head roller separators are particularly well suited for separation of problematic shapes such as ball bearings or batteries. They are used for:

  • recycling and/or recovery of ferrous metals;
  • removing, purging or eliminating ferrous parts or weakly magnetic particles from product flows;
  • protection of machines (prevention of damage caused by metal particles);
Position of the magnetic pulley/head roller

Placement

Keep the following in mind when integrating a head roller magnet:

  • Use of head scrapers is not possible. Otherwise iron particles would be scraped off before the magnet can separate them.
  • No steel components in the vicinity of the head roller magnet (such as the splitter: it must be made of a non-magnetic material). Otherwise this part will be magnetized, which has a negative impact on the separation.
  • The field depth of the magnet.
  • Type of magnet system in combination with the belt thickness.

The optimal placement/position of the separation partition depends on the application. Goudsmit has plenty of experience with this and will be happy to provide recommendations.

Position of the magnetic pulley/head roller

Working principle

A head roller magnet is a head or tail roller that is filled with magnets. This roller forms a magnetic system with a correspondingly rotating magnetic field that is active around the entire circumference. The magnetic field attracts ferromagnetic metal particles in a product flow, and the conveyor belt that runs over the roller carries these particles with it to the underside of the roller. When they are no longer in range of the magnetic field they fall off the belt, where they are collected and/or carried away.
For strongly magnetic particles, we can place carriers on the belt to ‘push’ the particles out of the magnetic field. For damp or fine metal particles we fit a scraper to prevent them from sticking to the belt.

The advantage of a head roller magnet is that it is a continuous system, so there is no need to stop the product flow to carry off the separated metal particles. This makes the head roller magnet very suitable for product flows with lots of Fe particles. Because the product passes very close to the magnet it is also a very powerful and effective separator.

Products

Add-on magnetic head pulleys

Magnetic head pulleys capture ferrous and weakly magnetic particles and continuously carry them away. Suitable for installation in existing belt conveyor systems, in the bulk transshipment or recycling industries for example.

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High-gradient magnetic head pulley systems

High-gradient magnetic head pulley systems are used to capture weakly magnetic particles. Due to the low magnetic field depth, this system is not suitable for high processing capacities.

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