By analyzing the working principle and control requirement of the horizontal vacuum brazing furnace,a PLC was employed with a touchscreen as the human-computer interface to develop an automatic control system of the vacuum brazing furnace.The design included the main circuit for the pump motor and control circuits comprising power controller,temperature controller,recorder,and heating system.Additionally,the human-computer interfaces for process parameter setting,temperature control,limit exceeding alarm,data report,and historical trend display were developed.The PLC control program was designed at the same time.Through debugging,the developed automatic control system of the vacuum brazing furnace demonstrates precise temperature control during heating,exhibiting high reliability and automation,effectively resolves issue associated with complex manual operation.
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