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    • CommentAuthorquangongzi
    • CommentTimeOct 12th 2018 edited
    The development of control system for large vacuum aluminum brazing furnace is introduced. The main functions of the control system are temperature control and logic control, which require a large number of control points, and each controlled object is related to each other. The core of the control system is programmable logic controller. Using CX-Programmer software programming method to achieve the control of various mechanical systems and set up a variety of protection functions. Programmable logic controller has the advantages of flexibility, convenience and easy maintenance. The final debugging results and the operation status of the vacuum furnace show that the control system can not only achieve the control objectives, but also ensure the long-term fault-free operation of the equipment.
    Vacuum aluminium brazing is a kind of soldering method that fills the gap of the base metal with liquid filler metal whose melting point is lower than that of the base metal under vacuum heating. The process of filling the tiny gap of the base metal is completed by capillary suction. From 1980s to 1990s, vacuum aluminum brazing technology and vacuum aluminum brazing equipment have been greatly developed in China. The mature process specification of small aluminum plate-fin heat exchanger and technical requirements for aluminum brazing equipment have been put forward. At the beginning of the 21st century, large vacuum aluminum brazing furnace has been successfully developed in China because of the need of manufacturing process of large aluminum plate-fin heat exchanger.
    With the continuous improvement of the level of industrial automation and the rapid development of computer technology, the level of automation control is also getting higher and higher. However, as a control device, programmable logic controller (PLC) can take advantage of computer's complete function, flexibility, versatility and relay system. Simple to understand, easy to operate, cheap and other advantages of a set, and can adapt to the industrial environment. Therefore, the PLC used as the control core in the electric control system of vacuum aluminum brazing furnace has its obvious advantages. Programmable logic controller (PLC) has been used in most of the medium and small vacuum aluminum brazing furnace. In the control system of large vacuum aluminum brazing furnace, there are many points to be controlled. It is necessary to set up complex interlock protection and further develop it on the original basis.

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