Belt width

Magnet power cold/warm

Weight

Advised max. installation height

Electro overband magnets

Heavy, robust and very powerful. Electromagnetic overband magnets have a deeply penetrating magnetic field and are therefore suitable for very thick layers. A control box is required. The magnet can be turned off for service or cleaning purposes.

  • Electrical power supply required
  • Max. installation height 600 mm
  • For belt width 800-1600 mm
  • Switchable (electromagnet)
  • Max. layer thickness 450 mm
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Electro overband magnet examples Goudsmit offers various types and sizes in order to fit your requirements, see below for full range of products.

3 variants

Belt width : 800 - 1000 mm

Price on request

ROE-05-C-100-W-G-R-B-R-B-B-NA
Article number SEEB100023
Stock 0
Advised max. installation height 360 mm
Magnet power cold/warm 5800 / 4300 W
More info..
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Belt width : 1200 mm

Price on request

ROE-06-C-120-W-G-R-B-R-B-B-NA
Article number SEEB120023
Stock 0
Advised max. installation height 450 mm
Magnet power cold/warm 7600 / 5600 W
More info..
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Belt width : 1400 mm

Price on request

ROE-08-C-140-W-G-R-B-R-B-B-NA
Article number SEEB140023
Stock 0
Advised max. installation height 520 mm
Magnet power cold/warm 10 400 / 7600 W
More info..
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Application

An overbelt magnet is suitable for removal or separation of high volumes of iron or steel and hangs above a flat- or trough-shaped conveyor. This type of magnet is self-cleaning and continuously separates Ferrous parts from material streams. The iron removal efficiency of overband magnets ranges from 70 to 90%. This depends on magnet design, product flow and placement. Automatic self-cleaning overbelt magnetic separators are suitable for both the recovery of ferrous parts and the removal of iron impurities.

 

The electro overband magnet has the deepest holding field and is therefore the most suitable of all the overband magnets for the removal of steel particles from material streams with thick layers. Disadvantages are the higher power consumption and higher weight relative to the permanent overband magnets.

Permanent ferrite overbelt cross

Operation

Conveyor belt speed:

to remove ferrous or iron parts from a material flow, they must remain in a magnetic field for between approximately 0.3 and 0.5 seconds, where they are magnetized. To achieve maximum separation, it is important to optimally match the size of the magnet block (main pole) and the belt speed. This means that with a narrow overband magnet the conveyor belt beneath it must run at lower capacity (m/s) than with a wider magnet at the same suspension height. The following formula provides an indication of the maximum conveyor belt speed:

 

Maximum conveyor belt speed (b) = block magnet width (a) / 0.3 (sec.)

 

Recommended conveyor belt speed (b) = block magnet width (a) / 0.5 (sec.)

Time in magnetic field

Overband placement

The distance between a magnet and the conveyor belt must be as small as possible. The magnetic force decreases exponentially with increasing distance. There is, however, a minimum distance required so the rubber cleats safely remove all the ferrous parts from the material flow. There are two methods for use/placement of overband magnets: transverse and in-line. Goudsmit has a specific, optimum magnet configuration for both mounting options.

 

Transverse ('Cross')

In practice, transverse placement is most common, because it is easier to install in an existing line. An additional advantage is a ferrous discharge to the side, which from the logistical perspective is easier to process.

 

'In-line'

If you have the option to place your overband magnet in line with the conveyor belt, this is always preferred. The advantage of this is that the transported material ‘breaks open’ at the end of the belt (head roller) and is therefore suspended in mid air for several milliseconds. As a result, the magnet can easily pull the ferrous metal out of the product flow.

Overbelt magnets mounting positions

Non magnetic zone

When positioning the magnet, the construction below the magnet such as the frame, bearing rollers and end rollers must be made of non-magnetic material. This is because steel parts will become magnetized, which will adversely affect the separation performance of the overband magnet.

 

For more information and the rule of thumb, see: Non-magnetic-zone.

Non magnetic zone 1200x750

Products Electro overband magnets have a deeply penetrating magnetic field and are therefore suitable for very thick layers. A control box is required. Installation perpendicular to or in line with conveyor belt. See below for all types.

4 variants

Belt width : 800 - 1000 mm

Price on request

ROE-05-C-100-W-G-R-B-R-B-B-NA
Article number SEEB100023
Stock 0
Advised max. installation height 360 mm
Magnet power cold/warm 5800 / 4300 W
More info..
  • Specification
  • Accessories
  • Videos
  • Downloads
  • Request a quote or order

Belt width : 1200 mm

Price on request

ROE-06-C-120-W-G-R-B-R-B-B-NA
Article number SEEB120023
Stock 0
Advised max. installation height 450 mm
Magnet power cold/warm 7600 / 5600 W
More info..
  • Specification
  • Accessories
  • Videos
  • Downloads
  • Request a quote or order

Belt width : 1400 mm

Price on request

ROE-08-C-140-W-G-R-B-R-B-B-NA
Article number SEEB140023
Stock 0
Advised max. installation height 520 mm
Magnet power cold/warm 10 400 / 7600 W
More info..
  • Specification
  • Accessories
  • Videos
  • Downloads
  • Request a quote or order

Belt width : 1600 mm

Price on request

ROEZ-09-C-160-W-G-L-B-B-B-B-NA
Article number SZEB160004
Stock 0
Advised max. installation height 600 mm
Magnet power cold/warm 16 200 / 11 900 W
More info..
  • Specification
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The electro overband magnet has the deepest holding field and is therefore the most suitable of all the overband magnets for the removal of Fe particles from material streams with thick layers. Disadvantages are the higher power consumption and higher weight relative to the permanent overband magnets.