A multi-coil based electromagnetic heating device and its temperature control method

Abstract

The invention discloses an electromagnetic heating device based on a multi-coil and a temperature control method thereof, belonging to the technical field of electromagnetic heating. The invention aims at the problems of uneven heating and low heating efficiency in the resistance coil heating mode adopted in the existing mold heating and plasticizing process. The invention includes a heating plate, which includes several heating areas, and the heating areas include a control module, a PWM control module, a switch circuit, an electromagnetic coil and a current measuring resistor, and the control module, a PWM control module, a switch circuit and an electromagnetic coil form a control The output end of the electromagnetic coil is connected to the control module through a current-measuring resistor to form a feedback circuit, and the control circuit and the feedback circuit form a temperature control closed loop. The heating efficiency of the present invention is high, each coil is individually closed-loop controlled, and the temperature is precisely regulated.

Description

technical field [0001] The invention relates to the field of electromagnetic heating, in particular to a multi-coil-based electromagnetic heating device and a temperature control method thereof. Background technique [0002] Mold heating and molding is an important part of industrial production. The traditional mold processing methods are mainly electric coil heating, fluid heating and infrared heating. Electric coil heating is based on the principle of contact heat conduction. The heat is transmitted to the barrel through the electric coil. Only the heat on the contact surface of the electric coil and the barrel is a useful heat source. The useless heat source, it is difficult to apply to high temperature occasions. At the same time, the existence of this temperature gradient will affect the heating uniformity of the material, thereby reducing the quality of the product. Although the electric coil heating structure is simple, the electric coil heating has a long dead time,...

AI Technical Summary

Problems solved by technology

Electric coil heating is based on the principle of contact heat conduction. The heat is transferred to the barrel through the electric coil. Only the heat on the contact surface between the electric coil and the barrel is a useful heat source. Most of the heat outside is lost to the air, which causes the ambient temperature to rise. Useless heat source, it is difficult to apply to high temperature occasions

At the same time, the existence of this temperature gradient will affect the uniformity of material heating, thereby reducing product quality. Although the electric coil heating structure is simple, the electric coil heating has a long dead zone time, slow temperature response, large heat loss, short service life and maintenance. Large and other disadvantages

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