Eddy Current system

As is well known, equal poles exert a repulsive force through which the metal particles are actually launched out of the waste flow. Materials with a comparatively weak conduction are hardly or not influenced by the generated magnetic field and therefore drop straight down. Depending on the density the metal parts are bent out of the waste flow. In practice an optimal removal can be achieved through adjustment of the separator. In addition, apart from the electrical properties, the density of the material to be removed must also be taken into account.

Eddy current separating systems of the previous generation were only capable of separating larger non-ferrous particles, exceeding ca. 9mm, from the waste. Bakker Magnetics' new generation separators however have a significant increased yield, since particles as small as 2mm can now be removed successfully from the waste flow.

In addition a "wet eddy current removal system" is in the final stage of the development trajectory. This patented system makes it possible to separate even smaller particles. 

MODULAR SYSTEM CONCEPT

Bakker Magnetics' new, recently introduced generation eddy current non-ferrous separators, have been incorporated in a modular system concept. This means that the various system elements can be mounted in the same base frame. This concept allows you to modify the configuration of the removal system, quickly and efficiently. In addition to this the modular structure makes it possible to incorporate (elements of) the system easily into existing plants. This construction also significantly simplifies maintenance of the system, allowing easy replacement, e.g. of the conveyor and the reverse drum.

STRUCTURE OF THE NON-FERROUS SEPARATION SYSTEM 

The base of the modular system consists of two steel support girders, which, together with the box girders, make up the frame of the system. Both sides of thhe frame have mounting plates for assembling the modular separation units, a vibrating feeder and/or a magnet drum for removing the iron particles from the flow of material. This base ensures a solid and stable seat for the system. Great attention has been paid to an effective seal, to prevent pollution in the various parts caused by dust formation. For this the system is fitted with a two-sided dust seal. Also for the driving and reverse drum measures are provided to avoid pollution. 

CONVEYOR BELT WITH INTEGRATED MAGNET ROTOR

The conveyor belt is controlled by means of a curved drive roll. The belt tension can be adjusted easily. Two switches, mounted at the bottom side of the conveyor, monitor the running of the belt. It is driven by a loose, 2.2kW motor, which is installed onto a sledge on the inside of the conveyor. Driving takes place by an entirely shielded drive belt. The conveyor itself is a heatproof, wear-resistant PU belt, fitted with carriers and edges. The induction roll, also called magnet rotor, is built into a glass-fibre reinforced polyester reverse drum, which is covered with a ceramic coating. 

The separation unit is available in 3 different models, depending on the product and the capacity. The separating plate can be adjusted quickly and easily to almost every position and angle of inclination, using the 'fast-click' positioning system. In this way construction parts do not obstruct the flow of materials.

The heart of the system control consists of a Siemens Programmable Logic Controller. This PLC contains the powerful CPU (the Central Processing Unit). Through thhe application of this modern PLC, the number of settings on the non-ferrous separator has extended enormously. It can be operated easily and the results of the settings are displayed on an LCD backlight screen. The settings can be read out in three languages: English, Dutch and German (other languages possible). As the status of the unit is monitored continuously, a safe, effective and reliable operation is guaranteed. Failures and maintenance intervals are reported on the LCD display as well. The software provides 3 password levels. Apart from the digital operation, thhe control panel has two continuously varible frequency controls: one 2.2kW control for the driving of the conveyor belt and another 7.5kW control with brake option for driving the induction roll. Four different pre-select settings can be entered. These parts are incorporated into a compact solid system housing.

The design of the imbalance vibrating feeder is entirely geared to the ECSM units. The trough is made of stainless steel AIS1304. The vibrating feeders are available in 2 standard lengths: 1,500 resp. 2,500mm.

The drum magnet links up perfectly with the modular design of both thhe ESCM conveyor belt and the vibrating feeders. The supplied support beams must be used if the drum magnet needs to be positioned directly before the conveyor belt. If the drum magnet has to be placed in front of the vibrating feeder, this must be mounted onto the support frame of thhe hopper. The standard system is equipped with a drive motor and a division plate.