Magnetic overhead cranes & gantry cranes for handling cold & hot coil in horizontal & vertical position. Check magnetic handling crane for steel coil handling.

Steel coil is a type of completed steel product that has been wound or coiled after rolling, such as sheet or strip. Steel coil handling, including loading, transporting, and storing, is a regular routine material handling operation in a steel fabrication site. So, what factors influence the steel coil handling equipment selection for your particular application or use?  It is determined not only by the frequency with which coils are moved and whether the orientation of the coil eye—the central hole—in horizonal or vertical postion, and the changes during the handling process, but also by related concerns about potential coil damage and personnel safety hazards.

Overhead crane and gantry cranes with magnets for steel coil handling

Based on crane structures , there are many types of cranes can be used for steel coil handling . The electric magnetic bridge cranes for indoor uses, and electromagnetic gantry cranes for outdoor uses.

Double girder overhead cranes for steel coil handling

Double girder gantry crane for steel coil handling

Check main types of double girder overhead cranes

Magnetic cranes is the simplest, quickest, and most cost-effective solution for handling coiled strip steel. Traditional mechanical lifting devices may cause damage to several layers of when grasping the coil, and damage can also occur when the coil is released. Lift magnets that are properly built almost reduce the danger of damage.

Magnetic handling will save your storage space since a magnet lifts the coil from right above the weight, eliminating the need for aisle space required by conventional lifting systems. Typically, one steel coil handling crane or crane operator can load, transport, and unload rolled steel coils without assistance from the floor, freeing up manpower for other tasks.

Depending on the orientation (eye vertical or eye horizontal), the dimensions of the steel rolls, the size and weight of the coil, its temperature, and whether it is banded or loosely wound, the proper magnetic bridge cranes or gantry cranes can be customzied for the handling of  coiled steel.

Magentic cranes for all steel coil handling of different types and conditions

Lifting Electromagnet travelling cranes can be used for cold & hot coiled Stee lin horizontal & vertical position.

• Cold steel coil handling - Geneally, the mangtic overhead cranes can be used for cold or normal temperature steel coils in including the Cold-rolled low carbon steel, Cold harden coil,Cold-rolled low carbon steel, Phosphorus high strength steel, etc. The magnetic coil handling cranes can be equipped with lifters customized for your cold rolled coil products based on your steel coil surface requirements, options are painting, lacquering, electroplating or otherwise.
• Hot rolled steel coil handling - During the annealing process, high temperature lifting electromagnets can be utilized to lift materials either vertically or horizontally at temperatures between 100°C and 600°C.

Magnetic overhead crane & gantry cranes for eye-vertical and eye-horizontal coil handling

• For horizontal coils -Horizontal type magnet attracts its side face of rolled coil steel , which is ideal for bundled coiled steel. Magnetic overhead cranes are designed to work optimally in the presence of loads with layered surfaces. Automatic load centring and, at the request of rotating motorized systems, truck stocking and loading.
• For vertical coils -Vertical type magnet attracts its end face, appropriate for bundled or unbundled coiled steel. Steel plants must be stacked within treatment ranges for coil annealing. The tailored vertical coil handling magnetic cranes enable you to handle the load with a single tool, eliminating the need for an operator on the ground or the use of an auxiliary crane hook. A load gripping laser system help the centering for the bridge crane operator in the cab. The magnetic poles are equipped with special extensions shaped to prevent crushing of the coil.

Lifting Electromagnet for Lifting Steel Coil Vertically

Lifting Electromagnet for Lifting Steel Coil Horizontally

• Attractive, small size, light weight, large lifting capacity, easy and safe operation.
• Operating at a high level of automatization with smart features.
• Use a completely sealed construction with good moisture-proofing properties.
• Simple and easy installation, operation, and maintenance.
• Computer-aided design with appropriate structure, light dead weight, and powerful holding force.

Steel coil handling cranes with different magnets

Electromagnets and electro-permanent magnets are the two main types.

• When energized, electromagnets are the conventional type that needs a steady source of D.C. power. These magnets typically work effectively in situations when the coil's surface has irregularities, like a sizable degree of edge stagger.
• Permanent magnetic material is encased in an electrically powered coil in electro-permanent magnets. An electro-permanent magnet is charged by applying a brief pulse of direct current power to the coil of the magnet in order to energize it. The electro-permanent magnet does not need a steady power supply to hold the raised steel coil once it is powered. The coil of the magnet receives a reverse pulse of D. C. power to release the steel coil. When the edge stagger of the steel coil is kept to a minimum, the electro-permanent magnet design usually performs well. For your reference, review the common types of crane magnets.

Magnetic steel coil cranes with different excitation powers

Divided into 3 types according to excitation voltage

• Over excitation: Excitation at 1.6 times the rated excitation voltage is referred to as over excitation.
• Strong excitation: Excitation at 1.3 times the rated excitation voltage is considered strong.
• Weak excitation: Excitation at 0.9 times the rated excitation voltage is the week excitation. Working in strong excitation mode: A working method that involves sucking materials in a short-term over (strong) excitation state and then holding and transferring materials in a weak excitation mode.

Cold & hot rolled steel coil handling

According to the temperature of the material or steel coils to be adsorbed,the magnetic cranes can be used for handling the following types:

• Normal temperature lifting magnets are lifting magnets that can absorb and move magnetic materials up to 150 °C.
• High temperature lifting magnets - Lifting magnets that can transport and suck magnetic materials at temperatures between 150 °C and 650 °C.
• Extra-high temperature lifting magnets are lifting magnets that can transport and suck magnetic objects at temperatures between 650 and 700 °C.

Hot rolled steel coilhandling cranes with magnet

During the annealing process, high temperature lifting electromagnets can be utilized to lift materials either vertically or horizontally at temperatures between 100°C and 600°C.

Hot rolled steel coils are produced from semi-finished goods that have been reduced in thickness, rolled, annealed, and reduced in size. They are used to make pipes, steel doors, and tanks, and it can also be cold rolled. Through the hot-dip galvanizing process, pure zinc coatings are available on hot-dip galvanized steel coils. It combines zinc's resistance to corrosion with steel's affordability, strength, and formability. The hot-dip procedure is the method used to coat steel with layers of zinc to prevent rust. Particularly helpful are the numerous outdoor and industrial applications.

They are primarily utilized in building roofs, doors, windows, roller shutter doors, and car body shells, chassis, doors, trunk lids, oil tanks, and fenders, as well as in electric equipment like refrigerator bases and shells,etc.

Because the individual layers contract during cooling, hot-rolled coils become less tightly wound. As a result, there are air holes between the layers. The higher the air gap or sum of air gaps in the coil, the greater the impact on the magnet's lifting force. Steel's magnetic properties are retained up to a temperature of 768°C. Steel loses its ferromagnetic characteristics above this temperature. The magnetic lifting force is only 75% of the force available at 0°C for a material temperature of 400°C. This decrease of lifting force must be compensated for for safety reasons. Compensation for flat material (e.g., hot billets or slabs) is performed by extending the contact area between the material and magnet(s). Because the area of contact with round material is limited to a single line, this may be difficult or impossible.

Our extensive experience as a magnet crane system manufacturer puts us in a great position to provide solutions for such difficult situations. Hot coils up to 400°C can be delivered securely thanks to a slew of safeguards:

Protective measures for hot rolled steel coils

• Utilization of a temperature-resistant sealing compound.
• Using a heat-resistant insulating material.
• Heat shields to shelter the magnet coils from radiating heat.
• The coils are protected from conductive heat by thermal insulation inside the magnet.The entire magnet surface is intended to function as a passive cooling unit.
• FE approaches were used to optimize the magnet design.
• Magnetic field that is specially oriented for deep penetration into hot-rolled coils.
• Magnet pole geometry has been improved.
• The magnet coils' temperatures are being monitored.

Horizontal coil handling magnetic overhead cranes 

Vertical coil handling magnetic overhead bridge crane

Advantages of steel coil handling magnetic cranes

• Special adaptations - Customized for various types of loads or objects handling in different applications.
• require less storage space to enlarge your operation area and suitable for low headroom or limited warehouse or workshop
• Reduce your labor cost and fewer people are required to handle and transport the loads and objects.

Lifting and moving coils with C-shaped hooks is dangerous:Load damages and deformations are common. Furthermore, clamping the coil is frequently unstable and thus dangerous to people and equipment. Permanent electro magnetic modules are a novel alternative to existing methods: Clamping the top of the load uniformly and without injuring it. It has several advantages over c hook for steel coil handing including:

• Centering Speed: Positioning the steel coil is quick and secure.
• Load Integrity: The load is not damaged in any way, making packing and protection unnecessary.
• Warehouse space optimization: Always working from the top requires no extra room for maneuvering.
• Fast coil picking and storage as well as ease of use to improve your working efficiency.
• Optimal coil stacking height thanks to the magnet's low overall height.
• High storage density because gripper clearance between coil eyes is eliminated.
• Coil handling and Transporting with no damaging coil edges.
• No moving parts, so much lower maintenance costs.

These electro permanent magnetic coil handling modues offer a welcome change from conventional mechanical devices:

• Uniform clamping on top of the load without injuring it;
• No dropping of the loaded coil in the case of an unexpected power outage.
• Since the magnet lifts the coil from directly above the load, eliminating the need for aisle space required by conventional steel coil lifting devices,
• much less storage space is needed when lifting steel coil with magnets.
• This results in an optimized warehouse area and freed up labor that can be used in other ways.

Experience has taught us that grabbing steel coils using other traditional lifting devices, such as C-shaped hooks, can damage many layers of coil or leave scratches or dents on the surface of the coil. Furthermore, when the steel coil is released, damage can occur. Aside from that, traditional coil clamping is frequently unstable, making coil handling dangerous to people and equipment. However, if you use a magnetic lifting device, you'll discover a much easier, safer, and more cost-effective way of handling steel coil - safely loading and transporting metal coils with properly designed magnets, virtually eliminating the possibility of damage.

5 ton magnetic overhead crane for vertical steel coil handling 

Clamp for vertical rolled steel coil handling 

Lifting tongs for vertical steel coil handling 

Magnetic cranes for steel coil handling in horizontal position for outdoor use and indoor coil warehouse use 

C hook for horizontal eye steel coil handling 

Automatic clamp for steel coil handling in horizontal position

Common technical parameters of magnetic steel coil handling cranes

• Working conditions:  For indoor or outdoor settings, or other special requirements.
• Rated excitation voltage:The electromagnet's rated excitation DC voltage is not greater than 660V, and the suggested rated excitation voltage is a combination of DC voltages of 220V, 11V, and 48V.
• Power-on duration: common kind 50% or 60%; high frequency type 75%
• Structural requirements: The electromagnet should be water-impermeable and adopt a fully sealed structure, according to your particular structural requirements.
• Protection Duty : Solenoid for indoor use IP54, IP55,  IP68The magnetic chain or spreader's mechanical strength safety factor shouldn't be less than 6.
• During use, the chain or spreader shouldn't get fractured or distorted.

Contact us to get your customized magnetic overhead cranes and gantry cranes for handling cold and hot steel coils in horizontal and vertical postion.