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Small Iron Melting Induction Furnace
The structure of the small iron melting induction furnace:
The small melting iron induction furnace includes an intermediate frequency power supply cabinet, a compensation capacitor, a furnace body (two), a water-cooled cable, and a reducer.
The furnace body is composed of four parts: the furnace shell, the induction coil, the furnace lining, and the tilting furnace reduction box.
The furnace shell is made of non-magnetic material;
The induction coil is a helical cylinder made of a rectangular hollow tube. During smelting, the cooling water is passed through the tube, and the copper bar from the coil is connected to the water-cooled cable;
The furnace lining is close to the induction coil and is made of quartz sand and sintered. The tilting reducer directly rotates the tilting of the furnace body.
The tilting furnace reducer is a two-stage turbine variable speed, with good self-locking performance and stable and reliable rotation. When there is an emergency power failure, it is necessary to stop the work and turn the furnace to avoid danger. The control of the tilting gearbox motors of the two furnace bodies can be selected through the furnace selection switch. The switch box with four-core rubber wires allows the operator to stand at a suitable position to control the tilting and resetting of the furnace body.
The melting process of molten iron induction furnace:
The melting process of a molten iron induction furnace includes three stages: furnace charge melting, composition homogenization, and molten iron superheating:
(1) Furnace charge melting stage. The charge first changes from a solid state to a soft plastic state in the iron melting furnace. After the charge is added to the furnace, in order to protect the furnace lining, the furnace body first rotates intermittently and slowly in both directions. Under the action of mechanical force and heat, the large metal charge is gradually decomposed into small blocks. When the temperature in the furnace rises to the melting point of the metal, the one-way continuous rotation of the furnace body improves the heat transfer effect between the furnace body and the charge.
(2) Component homogenization stage. The FeO and slagging materials (sand and limestone) formed in the melting stage first form slag, which covers and protects the molten metal. The charge changes from a plastic state to a liquid, the alloying elements dissolve into the molten iron, and the carbon in the recarburizer begins to dissolve into the molten iron. At this stage, the furnace body continues to rotate in one direction, which promotes the homogenization of the molten iron composition, and elements such as carbon, silicon, and manganese are quickly dissolved into the molten iron.
(3) The superheating stage of molten iron. The molten iron is superheated to the tapping temperature, and the carbon is completely dissolved in the molten iron. The slag and undissolved recarburizer cover the molten iron, and the molten iron is superheated by the heat conducted by the lining to reach the tapping temperature.
The principle of overheating molten iron in the iron melting induction furnace is the same as other industrial furnaces, the temperature of the furnace top lining is the highest, and the heat stored in the furnace lining is the most. During the rotation process of the induction furnace body, the heat accumulated in the top furnace lining is continuously brought into the molten iron to achieve the purpose of superheating the molten iron.