Electromagnetic Crane Hook/Lifter

Product Overview

The Electromagnetic Crane Hook/Lifter is a suspended electromagnetic lifting assembly for ferrous long products and bundled steel. It is installed below a crane hook or spreader through a matched suspension arrangement and uses a controlled DC magnetic field to pick up, transfer and release the load.

The product range covers material-specific magnetic circuits rather than a single universal magnet. MW18 and MW38 configurations are intended for bundled rebar and profiled steel. MW19 is arranged for coiled bar. MW25 is a rectangular lifting electromagnet for round stock, steel pipes, billets, ingots, blooms and selected profiled sections. MW35 uses a deep-penetration magnetic circuit for comparable round and tubular steel handling tasks.

This electromagnetic lifter is a below-hook lifting device, not a replacement for a mechanical crane hook. Model selection must be based on the actual material grade, section geometry, temperature, bundle arrangement, air gaps, lift path and duty cycle.

Core Configuration

Material-Matched Magnetic Circuit

Bundled rebar and profiled steel: MW18 and MW38 configurations address multi-layer gaps and bundle handling requirements. Coiled bar: MW19 configurations use contact geometry suited to coiled material. Reference coil conditions are outer diameter 1250-1350 mm and unit weight 900-1200 kg/m. Steel pipe, billet and round stock: MW25 and MW35 rectangular electromagnets provide a broad contact area for long ferrous products. Selected series are available in high-temperature configuration.

Suspension and Crane Interface

The lifting beam, chains, links and hook interface are configured as part of the complete load path. For long products, one magnet may be operated with multiple units and a matched beam arrangement to control load distribution and deflection. The required connection-point arrangement must be confirmed before manufacture.

Electrical Operating Basis

The listed series use a rated supply of DC 220 V and a rated duty cycle of TD 60%. Cold-state power and current are model-dependent. The control system, rectifier, cabling, discharge circuit and emergency power arrangement must be matched to the crane and operating risk assessment.

Technical Parameters

Range-Level Parameters

Selected MW25 Technical Data

Reference data for selected MW25 normal-temperature models. Dimensions are in mm. A is the magnet body length shown in the general arrangement drawing; B-G must be verified against the final drawing.

Selected MW25 High-Temperature Technical Data

Engineering Selection for an Electromagnetic Lifter

1. Define the load: material type, magnetic permeability, surface condition, diameter or section, length, temperature and piece or bundle arrangement.

2. Define the pickup condition: contact area, expected air gap, rust or scale condition, number of layers and minimum pickup position.

3. Define the lifting arrangement: number of magnetic units, beam spacing, suspension points, crane hook geometry and permissible load deflection.

4. Define the electrical arrangement: supply voltage, duty cycle, cable routing, control cabinet location, release method and power-loss protection requirements.

5. Validate the final lifting capacity: lifting capacity is conditional on the defined workpiece and operating state. It must be verified for the final material, temperature, air gap and lifting arrangement before the equipment is put into service.

Typical Applications

Rebar yards and rebar processing lines; steel pipe storage and transfer stations; billet, ingot and bloom handling; coiled bar handling areas; rolling mills and steel service centres; long-product staging, loading and machine-feeding operations.

Operating Boundaries

The electromagnetic crane hook/lifter must only handle ferromagnetic loads within the approved operating condition. Loose bundles, irregular stacking, excessive air gaps, high surface scale, material temperature beyond the selected configuration and unverified suspension geometry can reduce effective lifting capability. Personnel must remain clear of suspended loads. The complete system requires routine inspection of the magnet body, suspension components, electrical cables, insulation condition and control functions.

FAQ

What is an electromagnetic crane hook/lifter?

It is a crane-suspended electromagnetic lifting assembly that uses DC power to create a magnetic field for handling ferrous loads. The assembly normally includes the lifting magnet, suspension components and matched electrical control equipment.

Which materials can this electromagnetic lifter handle?

The series covers bundled rebar, profiled steel, coiled bar, round stock, steel pipes, billets, ingots and blooms. The correct series must be selected for the material form and pickup condition.

Is the listed lifting capacity a fixed safe working load?

No. Magnetic lifting capability changes with material grade, temperature, contact area, air gap, surface condition, bundle geometry and the number of magnet units. The final capacity must be confirmed for the actual operating condition.

What power supply is required?

The listed models use DC 220 V with TD 60% rated duty cycle. The crane-side power, rectifier and control system must be engineered for the selected model and site requirements.

When is a high-temperature electromagnetic lifter required?

A high-temperature configuration is required when the workpiece temperature exceeds the normal-temperature operating condition. The actual temperature range and duty must be confirmed during selection.

Can one lifting electromagnet handle a long steel product?

A single unit may be suitable only where the load length, stiffness and pickup condition permit. Long products commonly require multiple magnet units with a matched lifting beam to control deflection and load sharing.

What information is required for selection?

Provide the material type, dimensions, unit or bundle weight, temperature, surface condition, required lifting length, handling frequency, crane data, available electrical supply and the intended beam or hook interface.

Request a Technical Selection

For a correct electromagnetic crane hook/lifter configuration, submit the material drawing or photographs, load data, temperature, handling sequence, crane hook dimensions and electrical requirements. The final proposal should define the magnet series, number of units, beam arrangement, suspension interface and control package as one engineered lifting system.

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