Electromagnetic heating device based on multiple coils and temperature control method of device

Abstract

The invention discloses an electromagnetic heating device based on multiple coils and a temperature control method of the device, belongs to the technical field of electromagnetic heating, and aims tosolve the problems of non-uniform heating and low heating efficiency of a resistance coil heating mode adopted in the existing mold heating and plastic process. The device comprises a heating plate,the heating plate comprises a plurality of heating areas; each heating area comprises a control module, a PWM control module, a switching circuit, an electromagnetic coil and a current measuring resistor. The control module, the PWM control module, the switching circuit and the electromagnetic coil form a control circuit, the output end of the electromagnetic coil is connected with the control module through the 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 is high, all thecoils are independently controlled in a closed-loop mode, and the temperature is accurately regulated and controlled.

Description

technical field [0001] The invention relates to the field of electromagnetic heating, in particular to an electromagnetic heating device based on multi-coils and a temperature control method thereof. Background technique [0002] Mold heating and molding are important links in industrial production. 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 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...

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

Images