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The induction furnace can be divided into core induction furnaces and coreless induction furnaces. Today, we are going to talk about coreless induction furnaces.
The working principle of the power supply of the induction melting furnace is rectified by a three-phase power frequency AC power supply through a three-phase fully controlled rectifier bridge (the device adopts a thyristor) to form a pulsating direct current with adjustable voltage, which is filtered into a smooth direct current through a reactor LD and sent to a single-phase inverter Bridge (the device uses a thyristor), from the inverter bridge, it outputs an intermediate frequency single-phase alternating current that is dozens to hundreds of times higher than the power frequencies to the load in the magnetic field.
The load of the induction melting furnace is an LC series-parallel oscillating circuit composed of an induction coil (including heating charge) and an intermediate frequency electric heating capacitor. The circuit has strong adaptability to the load and stable and reliable operation.
The rated power of the induction melting furnace can be adjusted by adjusting the rectifier trigger pulse control angle to change the output voltage to achieve the purpose of power adjustment;
The output frequency of the induction melting furnace is determined by the resonant frequency f of the load LC parallel oscillator. Since the inverter bridge trigger pulse control signal is taken from the load circuit, when the load circuit LC parameters change, the inverter bridge output frequency can also occur accordingly Change, play the role of automatic frequencies adjustment.
Composition: induction heating equipment + induction coil + melting pot
It is suitable for the smelting of small-weight material. For example, a fixed smelting furnace can be considered for metal smelting of 1-5kg. But in the process of use, because there is no protection of the furnace’s shell and bracket, you need to be extra careful to avoid burns.
this machine is ideal for melting precious metals.
Composition: induction heating equipment + water-cooled induction coil + melting pot + foot-type furnace support
Suitable for the smelting of small and medium weights. Suitable for 1-10kg metal smelting. Therefore, this type of smelting furnace pushes the pot out of the induction coil, so it is necessary to pay attention to the clamping force and safety when clamping the crucible.
Composition: induction heating equipment + induction coil + crucible + mechanical, electric furnace and hydraulic furnace body;
Suitable for metal smelting of all weights. When the weight exceeds 100kg, the hand-cranked type may be very heavy due to the increase in weight both from molten metal and crucible. So you can consider using an electric furnaces. The hydraulic smelting pot also has an excellent performance in heavy smelting. This furnace is very durable and has a long life. An ideal choice for foundry.
Any magnetic metals can be melted in the melting furnaces. When we calculate the melting rate, we should consider the metal’s density, capacity for each melting, and the melting speed you required. For more easy understanding, we listed some common metals. The data below is calculated from the second pot melting because in the first melt, the induction heating machine power supplies have to heat the crucible first and the heat will be transferred to the molten metal.
● It is convenient to replace the furnace body with different weights, different materials, and different starting methods to meet various melting requirements;
● It is very convenient to install, debug and operate, and you can learn it as soon as you learn;
● It can work uninterrupted for 24 hours, and the melting is even and faster;
● Environmental protection, meeting environmental protection requirements, eliminating the trouble of environmental inspection;
● Power saving, compared with thyristor IF, not only is it small in size and easy to maintain, it can also save electricity by 15-20%.
● It has an electromagnetic stirring effect, which is beneficial to the uniformity of the smelting metal temperature and organization, which is beneficial to scum and reduces impurities;
● The equipment is small in size and light in weight. The melting capacity ranges from a few kilograms to hundreds of kilograms, with a wide range of options. It is not only suitable for factory production and use, but also suitable for small-scale smelting in schools and research institutes;
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