Automatic Control System of Vacuum Furnace

The quality of brazing products is directly affected by the performance of the necessary equipment in brazing process. Vacuum furnace system is mainly composed of vacuum system and heating system and related control equipment. The vacuum system consists of mechanical pump, diffusion pump, main valve, bypass valve and high vacuum baffle valve. The mechanical pump is a rough vacuum device. Its power source is three-phase AC motor, and the high vacuum oil diffusion pump is a high vacuum device. With the help of the former mechanical pump, the oil diffusion pump and the electric furnace heating, the pumping work required for high vacuum is completed, which is controlled by contactor.

The heating system of vacuum furnace is composed of heating power supply and heating elements. The heating power supply uses magnetic voltage regulator and DC excitation power supply to realize smooth stepless voltage regulation without contacts and loads. The DC excitation power supply is controlled by power regulator. The power regulator uses the difference between the current value of furnace temperature and the set value detected by thermocouple through temperature controller to output DC signal through PID calculation. The magnetic saturation voltage in the magnetic voltage regulator is controlled, and the heating current and temperature are automatically regulated according to the temperature control curve set by the temperature controller.

The control objectives of the automatic control system of vacuum furnace are: to realize automatic/manual air pumping function; to display the vacuum degree of the instrument, and to carry out manual or automatic control of the brazing process in accordance with the requirements of the vacuum degree; to realize automatic computer programmable control and manual control, digital display, automatic recording, over-temperature, water cut-off and couple break-off by temperature controller, thermocouple and trigger. Dynamic alarm, high temperature chamber and medium greenhouse are vacuum cooling.

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