Longitudinal electromagnetic stirring device for electromagnetic induction holding furnace

Abstract

The invention relates to a longitudinal electromagnetic stirring device for an electromagnetic induction holding furnace. The longitudinal electromagnetic stirring device is characterized in that power-frequency alternating current is changed into high-frequency alternating current through a rectification module, a filtering module and an inversion module, and the output terminal of the inversion module is connected with an electromagnetic induction coil of the electromagnetic induction holding furnace; the output terminal of the inversion module is further connected with an automatic switching parallel capacitor bank connected in series with the electromagnetic induction coil; and a control unit is further provided and is in control line connection with the automatic switching parallel capacitor bank to control the input number of capacitors, so that different resonance frequencies are obtained, and the electromagnetic induction holding furnace has both a high-frequency heating running mode and a low-frequency stirring running mode. Owing to arrangement of a man-machine interaction unit, the control unit controls the electromagnetic induction holding furnace to be in various stirring / heating running modes, so that such quality problems as segregation, formation of shrinkage cavities and formation of columnar crystals during metal casting, particularly alloy casting, are effectively solved.

Description

technical field [0001] The invention relates to the technical field of melting furnaces, in particular to a longitudinal electromagnetic stirring device for an electromagnetic induction holding furnace. Background technique [0002] In order to improve the quality of non-ferrous metal products, the liquid metal must be fully stirred during the metal smelting or melting process. Stirring methods mainly include manual stirring and electromagnetic stirring. Among them, manual stirring has poor stirring quality and low stirring efficiency, but has the advantage of low cost. The working principle of electromagnetic stirring is: the frequency conversion power supply sends 0.8-3.5HZ ultra-low frequency AC current to the induction coil of the electromagnetic inductor, and the iron core of the inductor generates a traveling wave magnetic field. When the traveling wave magnetic field penetrates the furnace wall and acts on the molten metal, under the action of the Loren magnetic forc...

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Problems solved by technology

[0003] The traditional melting and casting holding furnace mostly adopts the resistance heating method, which not only has low thermal efficiency, but also cannot realize the stirring of the metal solution, so it is impossible to control the uniformity of the metal alloy composition, and it is also difficult to control the product quality; the ordinary electromagnetic induction holding furnace uses three Phase power frequency alternating current is transformed into high-frequency single-phase alternating current of 10-20KHZ through rectification, filtering and inverter links, and then the electromagnetic induction coil is connected and the energy is transferred to the metal solution by electromagnetic induction to achieve the heating and heat preservation effect on the metal solution ;Using an ordinary electromagnetic holding furnace, although the efficiency can be increased by about 30%, but due to the high operating frequency, it is difficult to overcome the viscosity of the aluminum liquid to produce a stirring effect, and it is impossible to effectively control the quality of aluminum alloy products

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