Design On Structure And Development Of Supervisor System Of VT25KG Vacuum Induction Furnace

Vacuum induction furnace for high-temperature alloys smelting is so an important equipment, which has a wide range of applications of the production of materials in modern industry. Although in our country vacuum induction furnace starts earlier, but the majority of mechanical design is a replica of foreign products, especially in the control technology research, which is still a big gap with foreign countries. With the development of computer technology and intelligent control theory, the answer of how to realize the intelligent control system and how to realize the automation systems is to improve the control level, reducing the gap. This topic comes from the Shenyang Wei Tai Technology Development Co., Ltd., the main mission is to complete the mechanical design of vacuum induction furnace and signal control system development.The main design of the mechanical is to complete:the furnace vacuum chamber, vacuum pumping system, and other auxiliary bodies design. According to the design requirements, furnace design is for small vertical, as well as to facilitate access of materials which has designed the open front door; The vacuum system uses a high vacuum pumping unit, which is composed of the mechanical pump, Roots pump, diffusion pump; Accessibility is composed of the feeding sector agencies, low casting agencies, casting agencies and other components centrifugal that achieves a variety of mechanical movement in the smelting process.Monitoring and control system is mainly to complete the signal acquisition, display and processing, and control various digital and analog outputs, completing the requirements of monitoring the heating process of vacuum induction furnace smelting. Monitoring system hardware is mainly based on an industrial control PC, a platform to PLC as the main signal acquisition and controller; According to the nature of the signal acquisition and the use of the environment and other requirements, such as the molten metal temperature signal to the high temperature measurement using thermocouples, cooling water temperature using a Pt100 thermal resistance, while the signal amplifier configuration, and finally collected into analog signals4-20mA standard signal output, directly by the PLC analog capture module acquisition, PLC built-in A/D and D/A converter module for converting analog signals; PLC use serial communication means to communicate with the PC, IPC; Controlling the temperature of the molten metal through the use of Japanese experts in conducting FP93temperature controller with PID feedback control, which has obtained a good control effect.Monitoring system software based on Beijing Yakong Technology Development Co., Ltd. as a development platform Kingview6.51, running in WINDOWS-XP system; Monitoring software using object-oriented design methods, establishs the monitoring screen of simulation of the melting process, reflects the real-time actual process conditions; The communication with the PLC through the serial port is for data communications, to achieve real-time data acquisition, real-time display, data recording, data printing and curve trend display. This monitoring system can be used in control of signal detection for similar equipment.Finally, the whole system is also designed to debug study, and the system is reliable after commissioning.