Lifting Electromagnets

Keyword:Lifting Electromagnets   Model:700-2400mm   Time:2018-10-15 10:08:12

Lifting Electromagnets used to lift attached materials are a kind of special equipment which utilizes the electric &magnetic physical quantity. Lifting electromagnets are indispensable for lifting and transporting ferromagnetic materials in line of metallurgy, mine, machinery, shipbuilding and transportation etc. sometimes we also call them circular lifting electromagnets or scrap lifting electromagnets.


FEATURES

• Permanent, circular, highly efficient, long servicing life, and handling is super strong

• High magnetic force, high lifting capacity, light self weight, and simple structure reliability

• better moisture resistance, good wear-resistance and heat-proof performance

• fine insulation structure, low power consumption, wide usage and is very safe

• Special  magnetic circuit design has large air space and magnetism density

• Specially processed energizing coils improve the electrical and mechanical properties

• With a  unique way of insulation expanding application range of the electromagnet

• Flexible and optional--a complete set of electric control device can change by request

• Smart and convenient--be able to be used by remote control and wireless

• Wide usage for matching, mould making, dockyard, steel structure plant, warehouse

• Omnipotent---suitable for working with all kinds of lifting equipment

• With simple and convenient installation, operation and maintenance

• Increased rated power-on sustaining rate improve the efficiency of the electromagnet

• Coil protection plate adopts abrasion-resisting and shockproof rolling high-Mn steel

• High temperature type electromagnet adopts unique method of heat protection

• time and effort saving-be able to lift steel more quickly and conveniently than other devices

• Lifting capacity can be further improved by switching to over excitation control mode

Diameter                                                                        700-2400 mm 
Surface                                                                          100% Leak Proof
Material                                                                          Stainless steel, casting steel
Certificate                                                                      ISO9001:2008
Factory inspection                                                       Available
Structure                                                                       Welded and combined chain
Standard or nonstandard                                            Standard
Delivery                                                                         By sea and by air
Size                                                                                Standard size and others are required
Application                                                                    Load lifting, lashing, pulling and dragging
Safety factor                                                                 4:1
HS code                                                                        73269090
Packing                                                                         Fixed iron frame with five-plywood board packing
shape                                                                            Circular Lifting Handling Equipment
Application                                                                   Suitable for lifting  steel scrap, ingots and steel ball
Available                                                                       OEM & ODM
After-sale service provided                                         Engineers available to service machinery overseas

INTRODUCTIONS
            Lifting Electromagnets used to lift attached materials are a kind of special equipment which utilizes the electric &magnetic physical quantity. They are indispensable for lifting and transporting ferromagnetic materials in line of metallurgy, mine, machinery, shipbuilding and transportation etc. Lifting  electromagnets can also be used as electromagnetic manipulators, magnetic force  centering, bar length fixing and so on in some fields. Because of the diversity of lifted materials, the electromagnet structure, magnetic circuit, and manufacturing process are different, so there are many series.
           Utilizing the electromagnetic principle, the working process of lifting electromagnets is following. When the electromagnet is turned on, the internal  coils generate magnetic force through magnetic panel, and thus heavy pieces of metal scrap are attached to it. After the pieces of scrap are move to the  appointed place, you turn the electromagnet off, and the magnetic force disappears, thus removing the scrap.
           Circular Lifting electromagnets have a variety of uses. For example, they can be used to search for metal objects in places where human beings have difficulty in reaching. Suitable for installing on excavators and cranes, lifting electromagnets are used for lifting iron & steel scraps, billets, bars, blooms, coils, etc. Featuring large attracting force, deep magnetic penetration and long servicing life, they are used in such places as steel plants, ports and steel mills. Besides, They can be submerged under water or oil and separate metal particles in it. They can be used at normal temperature and very high temperature in metallurgical plants, scrap yards, and ship-building plants. With simple structure reliability, they are suitable for working with all kinds of lifting equipment.
           This series of industrial lifting electromagnets adopts a special magnetic circuit design which has large air space and magnetism density. They are made of aluminum wire or copper wire and the coil protection plate is made of the rolled high Mn steel plate which has good performance of wear-resistance and heat-proof. They also have the characteristics of light dead-weight, low power consumption, high lifting capacity and long serving life. Adopting the vacuum drying & glue filling, the insulation treatments have improved the electrical and mechanical performance of the coils. The insulation grade can reach class special C. Lifting electromagnets are easy to install, operate and maintain. What’s more, they save time and effort because they can lift steel more quickly and conveniently than any other mechanical device.
           A complete set of lifting electromagnets include control cabinet, cable reel, cable connector and electromagnet lifter. Generally, they adopt the control mode of constant voltage. But if switching to the control mode of over excitation, it can further improve the lifting capacity.

          They are also called electro permanent magnetic lifters,Electromagnetic chuck,industrial lifting magnets electromagnets, hydraulic grab electromagnetic circular lifting, electromagnet circular lifting magnets, industrial electromagnet lifting scrap iron, electromagnet lifting scrap metal, Circular scrap lifting electromagnet, Circular lifting magnet, Steel scrap and steel plate lifting handling equipment, Wire rod lifting electromagnet, Mine high quality electric magnet, Electromagnetic chuck, Lifting magnet for lifting scrap, Scrap electromagnetic magnet lifter, Electromagnetic lifter, Electromagnetic lifting magnets, Lifting steel scraps on crane, lifter magnet.

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Detailed Description
1. Electromagnetic Sucker

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2.Magnetic Coil

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3. Contro l Cabinet (Rectifier Cabinet or Battery Back-up Cabinet)
           A control cabinet working with lifting electromagnets mainly consists of automatic air-switch, transformer, 3 phases bridge rectifying components, DC contactor and so on. In case of short circuit and over voltage, the electrical  circuit has protection measures.
           During work, two things should be noted. First, the lifting electromagnets’ rated voltage must be in accordance with the out put voltage of the control cabinet. Besides, the electromagnets’ current must be less than or equal to the rated current of the control cabinet.

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4. Cable Reel (with cable) | Cable Drum
           A cable reel is a round, drum-shaped object such as a spool used to carry various types of electrical wires.
           Cable reel which can also be termed as drums have been used for many years to transport electric cables, fiber optic cables and wire products. Cable reels usually come in four different types, each with their own uses: wood, plywood, plastic and steel.
           To ensure the cable reel works normally with the lifting electromagnets, regular maintenance is required. We should regularly float the ash, contamination, oil, etc on the surface of cable reel to keep it clean and dry. Besides, we must periodically check whether the install reel and other parts of the fastener are loose, and any loose part needs to be tightened immediately.

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5. Cable

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6. Cable Connector | DC Connector
           A cable connector, also known as cable gland or cable fitting, is a device designed to attach and secure the end of an electrical cable to the equipment. Unlike electrical connectors, cable connectors connect wires to devices mechanically rather than electrically. They are used throughout a number of industries in conjunction with cable and wiring used in electrical instrumentation and automation systems. Used as a sealing and termination device, they can ensure that the characteristics of the enclosure which the cable enters can be maintained adequately.
           Cable connectors are made of various plastics, steel, brass or aluminum.

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7. Hook
         Hooks are needed to connect, for example, the excavator and the electromagnet.

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8. Lifting Beam
         Lifting beams are one of the most common lifting devices for material handling. Lifting beams are typically made from a beam and have a single top lifting point with multiple bottom lift points. The bottom lift points enable the user to specify exact lengths when rigging on standard or precision lifts.

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9. Wireless Remote Control
         Wireless remote controls enable operators to manipulate the equipment from a long distance, which is convenient and safe.

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10. Chain
         A chain is a serial assembly of collected pieces, called links, typically made of metal, with an overall character similar to that of a rope in that it is flexible and curved in compression but linear, rigid, and load-bearing in tension. A chain may consist of two or more links. Chains used to lift a magnet panel must be strong enough to keep safe transportation.

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11. Iron Core
         An electromagnet is a type of man-made magnet. Though it is made out of materials that are not themselves magnetic, when power is applied to its circuit, it acts just like a natural magnet, except it can be turned on and off. An electromagnet is essentially just a battery attached to a coil of wire wrapped around a metal core. The metal most often used for this is iron.

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12. Aluminum Coil
         The coil wrapping around a iron coil is usually made from aluminum.

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13. Mica Sheet
         Micas are fairly light and relatively soft, and the sheets and flakes of mica are flexible. Mica is heat-resistant and does not conduct electricity.

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14. Steel Plate
         Steel plate is a material often used to create metal products.

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15. Carbon Steel
         Carbon steel is a steel with carbon content up to 2.1% by weight.

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16. Insulatiing resin

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17.other parts

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Others

1.Warranty

There is usually one-year warranty.

2.Delivery package and transportation

The delivery package usually adopts standard export package (fixed iron frame with  five-plywood board packing to keep safety and long-distance transportation). All available shipping ways could be applied, by courier, air or sea. Usually the lead time is 7-25 days.

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3.Pre-sales service

Based on buyer’s request, all technical proposal will be offered by senior engineers.  Besides, full production process will be shown to buyer by photos & video during manufacturing.

4.After-sales service

After-sales service and technical support could be offered within guarantee period. Site maintenance could be also provided. Also, engineers are available to service machinery overseas.

5.Partial testing for lifting electromagnets before delivery

           (1)  Pressure testing at 2000V, 50 HZ.
           (2)  Inter turn testing at 550V.
           (3)  DC resistance testing.
           (4)  Insulation resistance testing.
           (5)  Electric clearance testing.
           (6)  Creep distance testing.
           (7)  Lifting capacity testing.
           (8)  Control cabinet testing.
           (9)  Other testing for magnet size & appearance.

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           6.  Three types for option
           --Normal temperature type (DC-220V TD-60%)
           --High frequency type (DC-220V TD-75%)
           --High temperature type (DC-220V TD-60%)
           7.  Cautions
           ① Material surface & Safe lifting conditions
           Lifting ferrous items using a magnet requires a good look at the length, width and thickness of the item. Thin metals do not absorb as many of the magnetic flux lines (magnetic energy) as thicker metals. Thin metals also flex, causing the  steel to peel-off the magnet. Equally important is the physical size, flatness, surface conditions and type of steel. The charts below illustrate how surface finish and Carbon content effect lifting value.
           Percentage Of Stated Lifting Power By Surface Finish


               SURFACE FINISH

Ground Surface

100%

Rough Machined

100%

Foundry Finish

85%

Rough Cast

65%

          Percentage Of Stated Lifting Power By Material


               CARBON CONTENT

Low Carbon 0.05-0.29%

100%

Moderate Carbon 0.30-0.59%

85%

High Carbon 0.60-0.99%

75%

Higher Carbon=Higher Residual*

0%

           *High Carbon steel (Tool Steel) will absorb magnetism and may magnetically stick to steel surface, such as the magnet or attract ferrous particles.
           ② Lifting angle relation to lifting force
           Maximum  lift force achieved by lifting electromagnets is when the direction of force is perpendicular  (90°) to the metal surface. If a load is tipped at an angle, shear forces, slide forces, friction, peeling forces associated with movement or impact forces from bumping the load as it is conveyed can cause the lift to fail.
           ▪  Check magnet/load balance by raising the load off the ground by 2″-3″only.
           ▪  Reposition the magnet until the load is level.
           ▪  Never lift a load at an angle in excess of 5°from horizontal.

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           ③ Loss of magnetism
           Under normal use conditions, a lifting electromagnet can experience a decrease in its original holding value. The most common factors which can cause a loss of strength include:
           ▪  Every day wear and tear on the magnet face such as: fine metal buildup on or between the magnet’s poles, nicks or gouges in the magnet’s poles, rust buildup, etc.
           ▪  Exposure to extreme temperatures.
           ▪  Severe blow or shock to the magnet. Do not use a blunt instrument to position the magnet on the load.
           ▪  Exposure to currents. Never place magnet next to a large motor or generator. Never use the magnet as part of a welding ground circuit.
           ▪  Exposure to vibration.
           ④Proper placement of magnets
           DETERMING LAYOUT
           The lifting electromagnets need to deal with steel sheets, containers, tubing, I-beams, well drilling pipe and more that can be just about any length, width and thickness. Sometimes the part needs to be rotated 90°or 180°. What all this means is more than one magnet attached to a spreader system may be needed to improve your part. See examples below.

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The lift magnet may require custom magnetic pole shoes to adequately lift the part  if your part is not a sheet or plate and it has peaks, valleys, ridges, etc. Customizing the face of the magnet to conform to the surface condition of the part ensures good contact between the two and most, if not all, magnetic strength will flow into the part to be lifted.
           ⑤ Magnet maintenance and care
            A lifting electromagnet, like any other tool, needs to be kept in good working order. Maintaining your lift magnet can only assist in a safe lift condition.
           ▪  Occasionally check the mechanical operation of the magnet release handle, spring, grip, as well as the lift lug for damage or fatigue.
           ▪  Keep the surface (magnetic face) of the lift free of chips, slag, weld beads, dirt, rust, etc. This can be done by wiping the surface of the magnet off  frequently with a wire brush, shop rag or gloved hand.
           ▪  Apply oil or grease to magnetic face pole surfaces if magnet is to be stored for long periods of time.
           ▪  After a period of time the magnet face poles may become somewhat rounded, nicked, or gouged, reducing the magnet’s effectiveness. Magnetic pole faces can be machined or ground to bring the magnet back to a consistent flat surface. Calibration tests can determine current magnetic strength of the lifter.
           ▪  Do not weld on, hammer, throw or drop the magnet.
           ▪  Do not strike, slam, ram or forcefully impact the magnet against other objects.
           ▪  Lift magnets are designed to be used in dry applications. Never use magnet under water without consulting the manufacturer.
           ▪  Always store the magnet in a non-conductive, dry environment.

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⑥Magnet calibration
           An annual calibration test is recommended to ensure that your lifting electromagnet is performing to its optimal level. Calibration of a lift magnet is a test, performed by an approved testing facility that determines the current lift capacity of the magnet, at the time of the test.
           Under an “Ideal Condition” environment, a series of break-a-way tests will determine the current “de-rated” holding value of your magnet. This holding value must meet or exceed the value stated on your lift magnet. If the stated holding value is met, the magnet can be returned to use and scheduled for another calibration test in one year. The outcome of the test allows the operator/owner of the lift to know that the magnet meets the lift standards as designed by the manufacturer.
           If the stated holding value is not met, the lifting electromagnets can possibly be machined to bring all magnet face poles back to a smooth, level condition. If that does not bring the magnet back to the manufactured lifting value, the magnet should be removed from operation and replaced with another magnet.
           A CERTIFICATE OF CALIBRATION, given at the conclusion of the testing, gives the operator/owner documentation of the magnet’s performance.

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Technical info

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Specifications

Type
Model
Diameter (mm)
Current                  (A)
Power               (Kw)
Lifting    Capacity (KG)
Weight (KG)
Steel Ball
Steel    Ingot
Steel    Scrap
Normal Temperature Type (DC-220V TD-60%)
LE70L/1
700
15
3.3
2500
380/200
120/100
490
LE80L/1
800
18
3.96
3000
480/250
150/130
620
LE90L/1
900
26.6
5.9
4500
650/440
250/200
800
LE110L/1
1100
35
7.7
6500
1000/800
450/400
1350
LE120L/1
1200
45.5
10
7500
1300/1000
600/500
1700
LE130L/1
1300
54
12
8500
1400/1100
700/600
2010
LE150L/1
1500
71.2
15.6
11000
1900/1500
1100/900
2830
LE165L/1
1650
75
16.5
12500
2300/1800
1300/1100
3200
LE180L/1
1800
102
22.5
14500
2750/2100
1600/1350
4230
LE210L/1
2100
129
28.4
21000
3500/2800
2200/1850
7000
LE240L/1
2400
154
33.9
28000
4800/3800
2850/2250
9000
High Frequency Type       (DC-220V TD-75%)
LE110L/1-75
1100
27.6
6.07
6500
1000/800
450/400
1500
LE130L/1-75
1300
40.7
8.95
8500
1400/1100
700/600
2280
LE150L/1-75
1500
51.4
11.3
11000
1900/1500
1100/900
3175
LE165L/1-75
1650
55.6
12.2
12500
2300/1800
1300/1100
3840
LE180L/1-75
1800
73.9
16.3
14500
2750/2100
1600/1350
4690
LE210L/1-75
2100
98.5
21.7
21000
3500/2800
2200/1850
7810
LE240L/1-75
2400
117.6
25.9
26000
4800/3800
2850/2250
10115
LE250L/1-75
2500
185
40.3
\
5600/4500
3500/2650
11100
High Temperature Type       (DC-220V TD-60%)
LE70L/2
700
12.77
2.81
2500
380/200
120/100
520
LE80L/2
800
16.1
3.54
3000
400/250
150/130
650
LE90L/2
900
20.5
4.51
4500
600/400
250/200
900
LE110L/2
1100
27.5
6.05
6500
1000/800
450/400
1500
LE130L/2
1300
40.6
8.93
8500
1400/1100
700/600
2300
LE150L/2
1500
51.4
11.3
11000
1900/1500
1100/900
3200
LE165L/2
1650
60.6
13.3
12500
2300/1800
1300/1100
3500
LE180L/2
1800
73.8
16.2
14500
2750/2100
1600/1350
4530
LE210L/2
2100
98.5
21.7
21000
3500/2800
2200/1850
7410
LE240L/2
2400
111
24.4
\
4800/3800
2850/2250
9830

Dimensions (mm)

Type
Model
A
B
C
D
E
Normal Temperature Type (DC-220V TD-60%)
LE70L/1
700
800
160
90
30
LE80L/1
800
800
160
90
30
LE90L/1
900
1090
200
125
40
LE110L/1
1100
1140
220
150
45
LE120L/1
1200
1180
220
150
45
LE130L/1
1300
1240
250
175
50
LE150L/1
1500
1250
350
210
60
LE165L/1
1650
1590
370
230
75
LE180L/1
1800
1490
370
230
75
LE210L/1
2100
1860
400
250
80
LE240L/1
2400
2020
450
280
90
High Frequency Type       (DC-220V TD-75%)
LE110L/1-75
1100
1270
220
150
45
LE130L/1-75
1300
1290
250
175
50
LE150L/1-75
1500
1360
350
210
60
LE165L/1-75
1650
1690
370
230
75
LE180L/1-75
1800
1650
370
230
75
LE210L/1-75
2100
1900
400
250
80
LE240L/1-75
2400
2100
450
280
90
LE250L/1-75
2500
2260
450
280
90
High Temperature Type         (DC-220V TD-60%)
LE70L/2
700
824
160
90
30
LE80L/2
800
824
160
90
30
LE90L/2
900
1115
200
125
40
LE110L/2
1100
1350
220
150
45
LE130L/2
1300
1280
250
175
50
LE150L/2
1500
1360
350
210
60
LE165L/2
1650
1690
370
230
75
LE180L/2
1800
1650
370
230
75
LE210L/2
2100
1912
400
250
80
LE240L/2
2400
2080
450
280
90
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