Design Of New-Style Monitor & Control System For High-Temperature Melt Viscosity

In the production process of the glass and metallurgy, the process parameters of high-temperature melt viscosity play a decisive role in the quality control of production chain and performance evaluation of final products. In the metallurgical industry, the viscosity which is one of the important physicochemical properties, not only has important influence on mass-transfer and heat-transfer of the metallurgical process, but also has been related to the process of the smelting and casting slab. So the research on measuring high-temperature melt viscosity has great significance in the industrial production process. But the foreign measuring device for high temperature melt viscosity is expensive at present, the temperature control structure and the viscosity measurement structure in the domestic measuring device are divided, namely the temperature control unit and the viscosity measurement unit are independent, leading to the tedious structure of the measuring device,low efficiency,the unreliable system and so on. So designing on measuring high temperature melt viscosity with simple structure,low-cost,low-cost,stability and reliability appears very important.Measurement device for high-temperature melt viscosity which can be used to measure the viscosity and viscosity-temperature characteristics of high temperature melt with 1000-1600℃is designed in this paper. The measurement device has two advantages. Firstly, temperature signal input module and viscosity signal input module are integrated into the lower computer control system, so the measuring instrument is simplified and operated easily. Secondly, the efficiency of measurement and the dynamic performance are improved by double closed-loop temperature control algorithm which is implemented. The design of the measurement device mainly involve the hardware circuit design of the lower computer,the design of the high-temperature control algorithm and the software design of the measurement and control system.Firstly, the principle of the viscosity measurement is introduced in this paper, a best method suitable for the measurement device for high-temperature melt viscosity researched in this paper is selected, and detailed analysis the principle of the method. Then designing the hardware circuit of the lower computer according to the measurement method selected, temperature control circuit,current detecting circuit,viscosity measurement circuit,serial communication circuit and keyboard-display circuit are included in the design, at the same time the working principle of the each hardware circuit is introduced.Secondly, relation between the temperature and the viscosity is analyzed. The working characteristics of the high-temperature heating furnace and the control difficulty is analyzed, we then come up with an adaptive dual closed loop fuzzy logic PID controller model according to the analysis results. The inner loop is used to control the current with a PI controller while the outer loop is based on threshold or the adaptive fuzzy logic PID controller. We surmise that the latter adaptive approach can yield better results than simple threshold or a pure PID technique. When properly set up, the adaptive fuzzy logic has the ability to track the changing conditions of the furnace over time and can a prior give better results.Then the measurement and control software which is based on the front hardware system and the temperature control algorithm is designed. The lower computer system software is emphatically introduced. Among them the programming for temperature signal input,the programming for current signal input,the programming for viscosity signal input,the programming for serial communication,the programming for keyboard and display and the programming for output control are included. Different functions of the upper computer software including temperature setting and control, viscosity dada display, time-viscosity curve display, temperature-viscosity curve display, historical data display, data print and so on are realized on the platforms of visual c ++.Finally, a new-style measuring device for high-temperature melt viscosity is researched based on above design method. A series of relevant experiments are tested on the measuring device. Analyzing of results detecting performance of the measuring device, results show the measuring device meet the design requirements...