Steel Shell Medium Frequency Furnace is a frequency conversion device that converts three-phase power frequency current into single-phase mediate frequency current. It causes eddy current loss in metal through electromagnetic field induction to achieve the purpose of heating and melting. It is mostly used for smelting, heating and heat preservation of ferrous or non-ferrous metals and alloy materials such as steel, copper and aluminum. Especially suitable for metal casting and steelmaking industries.
The induction coil is the heart of the induction furnace. The induction coil converts electromagnetic energy into thermal energy to melt the metal in the crucible. A multi-turns of coil that made of a rectangular copper tube is wound into a spiral shape. The surface is sprayed with high-strength insulating paint and wrapped with insulating tape. Refractory clay is also applied between the turns of the mediate frequency furnace. There are water-cooling rings above and below the induction coil.
The magnetic yoke is made of high-quality silicon steel sheets and is distributed around the induction coil to support as the skeleton, so that the furnace body reaches high strength and low noise. At the same time, it also plays a role in constraining the leakage magnetic flux outside the induction coil to prevent metal components from heating. The magnetic yoke made of silicon steel sheets corresponds to the magnetic lines of force produced by the induction coil, which shields the emission, reduces magnetic leakage, improves thermal efficiency, increases output, and saves 5%-8% of energy in the operation.
In order to ensure safe production, prevent the occurrence and expansion of furnace leakage accidents, help judge the condition of the furnace linings and extend the age of the furnace, it is necessary to set up a crucible leakage furnace alarm system. Generally, a DC alarm device is used, which installs a stainless steel wire bottom electrode (first electrode) in contact with the molten iron, and a stainless steel plate side electrode (second electrode) between the furnace lining induction coils.
The mediate frequency furnace is the main equipment in the casting, forging and heat treatment workshops. Its working stability, reliability and safety are the guarantee for the normal and stable operation of the casting, forging and heat treatment production lines in the flow operation. It has good development prospects in the field of heat treatment.
Our company's power supply for the Medium Frequency Furnace adopts high-performance, high-density, large-scale dedicated integrated modules, which makes the trigger circuit fully digital and has the characteristics of good reliability, high accuracy, strong anti-interference ability and fast response speed. The inverter adopts scanning zero-voltage start and has an automatic repeated start circuit. The starting performance is better than the intermediate frequency power supply widely used in the domestic market. The success rate can reach 100%. The frequency following circuit adopts an average sampling scheme to improve the inverter's anti-jamming capability, makes starting more convenient and reliable.
Customized design according to the actual needs of customers.
Long service life (generally normal service life is more than 10 years). 2. It has good stability and uses the magnetic yoke to firmly fix the induction coil, so that the coil and the magnetic yoke form a stable structure. 3. Energy saving, the magnetic yoke can form a magnetic barrier around the coil to reduce magnetic flux leakage. Compared with the aluminum shell furnace, it can save about 3%-5% of energy. 4. The casting point is stable, and the hydraulic tilting furnace device can better control the casting angle and speed.
The medium frequency electric furnace is small in size, light in weight, high in efficiency, consumes less power, melts and heats up quickly, the furnace temperature is easy to control, and the production efficiency is high.
The mediate frequency furnace is mainly composed of a power supply, an induction coil and a crucible made of refractory materials in the induction coil. The crucible is filled with metal charge, which is equivalent to the secondary winding of the transformer. When the induction coil is connected to the AC power supply, an alternating magnetic field is generated in the induction coil. Its magnetic lines cut the metal charge in the crucible, and an induced electromotive force is generated in the metal charge. Since the charge itself forms a closed loop, this secondary winding is characterized by having only one turn and is closed. Therefore, an induced current is generated in the charge at the same time. When the induced current passes through the charge, the metal charge is heated and melted.
| Furnace Tonnage T |
Rated power |
Rated frequency |
Coil voltage |
Pulse |
Power Consumption |
| 30 | 14000 | 150 | 3200 | 24 | 550 |
| 40 | 18000 | 150 | 3200 | 24 | 540 |
| 50 | 20000 | 150 | 3200 | 24 | 530 |
| 60 | 22000 | 100 | 4000 | 24 | 520 |
| 70 | 24000 | 100 | 4000 | 24 | 510 |
*The output will vary according to different materials, feed particle size and other factors
Company: IDM Metallurgy Trading Co., Ltd.
Group Address: Tangshan City, Hebei Province, China
Whatsapp: +86-15036707993
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