Overview of Screen Heating Systems
Flux-Power Screen Heating Systems are ideal wherever damp or moist materials cause sizing screen cloths to blind. A heated screen reduces the moisture surface tension that causes material to stick to the cloth media itself. The heated screen remains clear allowing maximum contact between the raw material and wire cloth mesh. Electrically heated screens permit finer material separations and more accurate sizing. The overall screen efficiency increases because of the additional open cloth area for material to flow over.
Higher Efficiency = More Tonnage = Higher Productivity
The most common usage is in the processing of basic mineral deposits such as clay, shale, limestone, and other aggregates. Screen heating systems have also proven very effective in the screening of fertilizers, foods and chemicals. Specialized units constructed of materials that are compatible with the product to be screened can be furnished. Some specialized units are operating in fertilizer processing facilities handling phosphoric, potash and sulfate rock as well as cured and uncured fertilizer compounds.
Another application includes coal that was once discarded because of contamination with clay and shale. The material is crushed and screened recovering coal that is typically used in power generation.
Flux Power Screen Heating is an effective solution for:
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Brick, Ceramic and Clay Industries
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Mineral and Aggregate Mining
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Coal Slurries and Recovery
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Dry Chemical and Fertilizer Manufacturing
An Ancient Method...
The history of screening can be traced back to early Egypt when a series of equal openings were assembled into a mesh to separate the particles of basic minerals.
The idea of electrically heating the wire cloth dates back to European patents in 1924. This was the first of many methods in an attempt to eliminate screen blinding using heat. It was determined that heat reduced the surface tension caused by moisture.
In 1947, Hanco developed the first commercially available screen heating system. This was just in time, because industry was beginning to expand as it emerged from World War II. The first applications were limited almost exclusively to the clay industry. Soon, other applications in a variety of industries were found.
In subsequent years, various improvements in conducting tension rails using copper and flexible copper cables were delivered. Silicon bonded fiberglass improved the insulation of screen boxes. Flexible shunts were used for a brief period as an attempt to transfer the power to the vibrating screen. Hanco recognized that a major deficiency was mechanically attaching the stationary transformer to a vibrating screen…
Flux-Power Provides Freedom and Flexability in Design
In 1961, Hanco pioneered the Flux-Power Heating System. This new method was a departure from conventional design. Most important, the mechanical connection to the vibrating screen was eliminated.
The new design also solved other problems. Failure of the primary winding due to a short circuit on the secondary of the transformer was eliminated. The transformer could now be complete encapsulated for protection from dust and water. The Flux-Power design provided freedom and flexibility to install screen heating on virtually any vibrating screen.
The Development Of Flux Power Transformers
The Flux-Power Advantage
Flux-Power is a unique method of transmitting electrical current from a stationary power source to a vibrating screen without any mechanical connections.
Flux-Power eliminates the wear and fatigue associated with physical connections such as cables, wires and shunts.
Other Flux-Power Advantages:
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Universal Electrical input: 240, 380, 480, 575, 600 VAC, 50/60 Hz, Single Phase
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Low Output Voltage, 1.9 – 12.5 Volts Typical
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Eliminates distortion of motion
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98% Electrical Transfer Efficiency
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Encapsulated Transformer Design
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Unlimited Secondary Current
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Flux-Power Transformers can be base mounted or suspended in any position.
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Tap Switch located on the transformer provides eight levels of heat control.
Basic Transformer Sizes:
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FL50-4 15KVA
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FL60-4 20 KVA
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FL70-4F 30KVA
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FL80-4 40 KVA
Tensioning Rails
The implementation of a completely aluminum conduction system created the ultimate in electrical screen heating systems. This extruded aluminum tension rail provided a substantial improvement in electrical conductivity versus the steel/copper combination.
The most demanding applications will require the Hanco patented “Wedge-Grip” aluminum tension rail design. The rail holds the hook strip of the screen cloth with a vise-like grip. Wedge-Grip tension rails provide maximum electrical contact with the cloth in the most severe environments.