Introduction to the vacuum furnace automatic control system

Introduction to the vacuum furnace automatic control system

Brazing process of the necessary equipment, its performance fit and unfit quality directly affect the brazing quality of the products. Vacuum furnace system is mainly composed of vacuum system and heating system and related control equipment. Vacuum system by the mechanical pump, diffusion pump, the main valve, bypass valve and high vacuum flapper valve, etc. Mechanical pump for coarse vacuum device and its power is the three-phase ac motor, high vacuum oil diffusion pump for high vacuum device, with the help of a former level of mechanical pump and the role of oil diffusion pump and electric heating extraction of the high vacuum degree requirements, all through the contactor control. Heating system is composed of heating power and heating element, heating power magnetic voltage regulator, using dc excitation power supply for non-contact smooth stepless voltage regulation of load the dc excitation power supply controlled by power governor, governor using temperature control and power! Free toe thermocouples detect the temperature of the current value and the difference between the set value, the PID arithmetic, dc signal output, control magnetic voltage regulator of magnetic saturation voltage, and then according to the set temperature control curve of temperature controller to realize the heating current and temperature automatic control. Vacuum protection automatic control system of the control goal is: 1 manual pump can qigong can realize automatic; Instrument shows vacuum degree, and the manual or automatic control in accordance with the requirements of the vacuum brazing process of related work steps; Temperature by using temperature controller and thermocouple and a trigger to realize automatic computer program control and manual control, digital display, automatic recording, overtemperature and water, automatic alarm, high in the greenhouse and chamber of vacuum cooling.