Circular Lifting Electromagnets for Steel Scraps

Circular lifting electromagnets for steel scraps
Circular Lifting Electromagnets for Steel Scraps

Lifting electromagnet is special equipment which utilizes the electric & magnetic physical quantity to lift attached materials and has become indispensable when to lift and transport ferromagnetism materials in lines of metallurgy, mine, machinery, shipbuilding and transportation etc and it can also be used as electromagnetic manipulator magnetic force centering bar length fixing and so on in some fields. As the attached materials are diverse, the electromagnet structure magnetic circuit and manufacturing process are also different. So there are many series of strong targeted products.
Circular Lifting Electromagnets  
Suitable for Cast Ingot, Steel Ball, Pig Iron, Machine Chip, various kinds of steel scraps, return scraps, baling scraps and etc in foundry factories and for iron powder in coal washer.
During slag disposal process, it can remove large size of iron at initial step. Outlet box has two chambers, an extra-thick fender and an anti-twist setting.
There are three excitation options: rated voltage DC 220V, Strong excitation, Over excitation.
Main technical data for normal temperature(used under normal temperature, power-on sustaining rate TD-50% Voltage DC-220V)
Circular Lifting Electromagnets for Steel Scraps
This table shows the common specifications. For the details, please contact us about it. Optional for any special specification.
Main technical data for high temperature(used under temperature 100ºC-700ºC,Voltage DC-220, power-on sustaining rate TD-50%)
 Circular Lifting Electromagnets for Steel Scraps
This table shows the common specifications. For the details, please contact us about it. Optional for any special specification.

Factors influencing lifting capacity
The lifting capacities specified on this website assume you will be lifting a clean, flat, steel plate that is thick enough to absorb all the magnetic energy. If the object does not meet these requirements, less holding force will be applied to the object.
The following factors have an impact on the lifting capacity:
1.     Surface conditions
Magnetic lines of force pass easily through iron, but not air. Therefore anything that creates space or an air gap (e.g. dirt, paper, moisture, burrs, rust or paint) between the magnet and the lifted object will have a negative impact on the lifting capacity of the magnet.
2.     Material to be lifted
Steel with a high carbon content, such as St37, is nearly as good a conductor as iron. Alloys, however, contain non-magnetic materials that have a negative impact on the magnetic conductance. AISI304, for instance, is nearly as poor a conductor of lines of force as air. Heat treatments that change the structure of the steel also reduce lifting capacity. The harder a type of steel is, the poorer the lifting capacity, and hardened steels often retain some 'residual magnetism'.
The table below shows the lifting power of various materials:

MaterialLifting Force
St37 (0,1-0,3% C)100
Non-alloy steel (0,4-0,5% C)90
Cast steel90
Alloy steel F-52280-90
AISI430 (magnetic stainless steel)50
Cast iron45-60
F-522 tempered (60 HRC)40-50
AISI304 (stainless steel/nickel)0-10
Brass, aluminium, copper, etc.0

3.     Thickness of load to be lifted
The greater the number of lines of force that can 'flow' from the magnet through the load, the more effective the magnet field will be. If the load is thin, the material will become 'saturated' with lines of force, preventing some of the lines of force produced by the magnet from 'flowing' through the material. Only if the load is sufficiently thick is it possible to utilize the magnet's full capacity. Once this point is reached, a greater material thickness will not result in any additional lifting capacity. In the case of a thin steel sheet, for instance, only a portion of the magnetic force will hold it in place because the sheet becomes saturated, effectively reducing the holding power of the magnet.
4.     Magnet contact surface on lifted load
If the entire magnet surface does not make contact with the load during lifting, the lifting capacity will be reduced.
5.     Bending of the lifted load
If a thin sheet is lifted with a single magnet, or if the load is much wider or longer than the contact surface of the magnet, the load will bend and 'peel off' of the magnet. The 'peeling effect' results in a certain reduction of the lifting capacity. Therefore thin sheets should be lifted with multiple magnets evenly distributed over the entire surface, and the magnet contact surface should always be in line with the lifted load, not perpendicular to its length.
6.     Temperature of the lifted load
The higher the temperature, the faster the molecules in the steel vibrate. Rapidly moving molecules are more resistant to an applied magnetic field and therefore result in a lower lifting capacity. The magnets that are used must not be exposed to temperatures above 80 °C. Otherwise they may become permanently demagnetized.
7.     Stacking of the lifted load
A magnet is designed for a particular lifting capacity; this capacity applies to a single lifted load. A lift capacity calculated for a single plate 10 mm thick is not the same as for two plates that are each 5 mm thick! If you want to lift more than one plate/profile at a time, you must state this clearly when placing your order. The specialists at Goudsmit will determine whether and, if so, how this can be done safely. It is often undesirable for two or three sheets to be picked up together when taking them from a stack. This can be dangerous, because the lowest plate can detach during transport. To avoid this, shallow field magnets are used for picking up thin sheets, yet this is often insufficient to prevent the problem entirely, so sheet separators are placed beside the sheets to ensure they are picked up one at a time.
All these factors contribute to a reduction of the lifting capacity. To calculate the total reduction of lifting capacity you must take the product of all the various factors.
About  Inquiry
To help you get the best magnet for your application, we should have the following information:
1. What are the materials you want to attract?
2. What kind of steel and iron? For example: Steel scraps, steel billet, ingot, plate, bar or ball.
3. What' s the lifting capacity you expect?
4. What kind of working site does the magnet work?
5. Do you want the Generator? If yes, want Diesel one or Hydraulic one?
6. Do you want the electric controller?
7. Kindly inform the excavator information. We also need the connection Part Size.
For more information,pleaes refer to: