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    • └Description
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    • └Description
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Galvanizing Process Section

Schematic of YG System

Strip Shape Correction by G System

Gas Wiping by Y System

Gas Lifter Type Top Dross Transfer System

Mitsubishi-Hitachi Metals Machinery, Inc. has developed a gas lifter type top dross transfer system that transports the top dross from locations which are difficult to reach during operation (inside the snout, near the air wiper) to the back of the snout and other locations which can be reached easily.
This system makes a large contribution not only to improving the quality of the galvanized strip, but also to improving the work environment for the operators.

Gas Lifter Type Top Dross Transfer System

Mitsubishi-Hitachi Metals Machinery, Inc. Non-contact strip stabilizer (electromagnetic vibration control system) is installed directly above the gas wiper over the zinc pot, and prevent vibration of the strip as well as perform camber and other width-direction shape corrections (cross bow etc) as the strip rises out of the pot. This makes possible high-accuracy uniformity in the zinc coating weight on the strip surface.

Sketch of Non-contact strip stabilizer

Typical example of applicated strip

• Strip thickness: 0.3 - 4.5 mm
• Strip width: 600 - 1,850 mm
• Materials handled: Zinc and aluminum plating materials
• Operation strip speed: Max. 200 mpm
• Strip unit tension: 0.6 - 2.5 kgf/mm²

Operation principle

Several sets of electromagnets and displacement sensors are installed in the strip width direction inside the housings on opposite (front/reverse) sides of the strip. The strip position is detected by the distance sensors, and is used to control the current flowing to each of the electromagnets.

Typical performance of a vibration control system

• Vibration control performance: Reduces Max. 10mmp-p vibration to an average of 25% or less. (Subject vibration frequencies: 0 - 10 Hz)
• Shape correction capability: Correctable crossbow 18 mm (at strip thickness 0.8 mm, strip width 1220 mm, and strip temperature of 450 deg C)
• Electromagnet attraction force: 15 kgf/set (at room temperature, strip thickness 0.8 mm, 2 levels/set configuration)
• Operation strip speed: Max. 200 mpm
• * The above assumes a gap between the electromagnet and strip of 15 mm and a Max. coil current of 3.9 A.

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