Project Background and Operational Requirements
The project is located at a large steel distribution center in Rayong, Thailand. The client primarily utilizes an electromagnetic overhead crane for the storage, stacking, and feeding of medium-to-thick steel plates for shear production lines.
Core Pain Points:
- Low Handling Efficiency:Traditional wire rope slinging requires manual climbing for hooking. A single cycle takes over 5 minutes.
- Safety Risks:Manual hooking of bulk steel plates poses crushing risks and often causes surface scratches.
- Restricted Workspace:High stacking density in the warehouse requires equipment with extremely high positioning accuracy.
Technical Configuration of the Electromagnetic Overhead Crane
To meet the high-temperature and high-humidity environment of Southeast Asia and the client’s frequent loading needs, this project utilizes a FEM standard double-girder electromagnetic overhead crane equipped with detachable rectangular electromagnets.
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Technical Item
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Specification / Configuration
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Rated Capacity
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10t (Including electromagnet self-weight)
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Span
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22.5m
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Effective Lifting Height
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9m
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Duty Class
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FEM 2M / ISO M5 (Designed for high-frequency work)
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Hoisting Speed
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0.8 / 5.0 m/min (Inverter dual-speed)
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Trolley/Bridge Speed
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5.0–40.0 m/min (Stepless frequency control)
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Protection Rating
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Motor IP55 / Insulation Class F
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Magnet Specs
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High-intensity rectangular suckers with 30-min power-off backup
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Core Advantages of the Electromagnetic Overhead Crane
- Modular Drive and Frequency Control System:The overhead crane utilizes Schneider inverters for all-axis control. Frequency conversion technology eliminates current shocks during heavy-load starts. This allows the electromagnet to achieve “zero-swing” precision during steel plate transport. Compared to traditional contactor control, mechanical wear is reduced by 35%.
- Strong Magnetic Adsorption and Safety Backup:The electromagnetic system uses DC220V constant voltage control. The magnets feature deep magnetic field penetration to lift multiple plates or a single plate. To counter unstable power grids in Southeast Asia, the system integrates a Lead-acid battery back-up. In the event of a power failure, the magnets maintain suction for over 20 minutes to prevent falling accidents.
- Weather Resistance and Anti-Corrosion Processes:Given the coastal humidity in Rayong, the steel structure underwent 5 sandblasting. It is coated with epoxy zinc-rich primer and polyurethane topcoat, with a total thickness of at least 120μm. The electrical cabinets are equipped with automatic condensation removers to prevent short circuits caused by moisture.
Operational Results and Delivery Feedback
The project has been operating smoothly for over 12 months. According to data provided by the client:
- Efficiency Boost:The handling cycle time was reduced from 300 seconds to 85 seconds. Unloading efficiency increased more than threefold.
- Labor Reduction:With wireless remote control, the previous 3-person operation (1 driver + 2 hookers) was simplified to 1-person ground control.
- Zero Failure Rate:To date, the equipment has maintained a record of zero unplanned downtime.
By combining VFD drives with safety magnetic backup, this electromagnetic overhead crane solution resolves the challenges of high-frequency, high-safety operations in high-temperature environments. Its automated magnetic adsorption technology is the industrial standard for enhancing logistics efficiency in the metal products industry.
