Multifunctional direct current induction heater structure capable of achieving gradient heating and uniform heating

Abstract

The invention provides a multifunctional direct current induction heater structure capable of achieving gradient heating and uniform heating, and belongs to the technical field of direct current induction heaters. The multifunctional direct current induction heater structure capable of achieving gradient heating and uniform heating comprises a plurality of induction heating parts which are arranged side by side in the axial direction of a metal rod to be heated; each induction heating part comprises a first heating column and a second heating column which protrude from an iron core; the firstheating column and the second heating column are mutually symmetric with respect to the central axis of the metal rod to be heated as the symmetric axis; and a magnet exciting coil is further arrangedon the iron core. The multifunctional direct current induction heater structure has simple structure, can change the magnetic field distribution of the heating region as long as the electric currentsize is adjusted, and can achieve the uniform heating and gradient heating of the metal rod; a certain temperature gradient is formed in the axial direction of the metal rod, so that the high temperature end takes the lead in entering an extruding machine; the deformation heat increases the temperature of a low temperature part of the metal rod, thus, an isothermal extrusion effect is formed in the entire extrusion process, the occurrence of defects such as microcracks inside the metal rod can be avoided, and the extrusion quality of the metal rod is improved.

Description

Technical field [0001] The invention relates to the technical field of direct current induction heaters, in particular to a multifunctional direct current induction heater structure that can realize gradient heating and uniform heating. Background technique [0002] The DC induction heating technology is proposed under the background that traditional heating technology including coal-fired gas heating and AC induction heating technology can no longer meet the requirements of energy saving and environmental protection. In this technology, a DC coil or permanent magnet is used to generate a DC magnetic field, and the heating object rotates in the DC magnetic field or the DC magnetic field rotates around the heating object, thereby generating eddy currents inside the metal to achieve the purpose of heating. DC induction heating technology can generate low-frequency (3-7Hz) eddy currents inside the metal rod by adjusting the speed, reducing the skin effect. At the same time, the dev...

AI Technical Summary

Problems solved by technology

The temperature gradient distribution is to obtain high-quality extruded products, because the deformation heat generated during the extrusion molding process will increase the temperature of the part of the metal rod that does not enter the extruder, so that the temperature of the metal rod during the entire extrusion process is not equal. This may cause defects such as microcracks inside the molded product, seriously affecting product quality

[0004] At present, the way of direct current induction heating to realize gradient heating is to adjust the angle between the end face of the iron core and the surface of the metal rod to change the distance between the end face of the iron core and the surface of the metal rod, so that a magnetic field with a gradient distribution is formed in the axial direction of the metal rod, and then the purpose of gradient heating is achieved. , but this scheme complicates the structure of the equipment and is inconvenient when adjusting the distance

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