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The Design of Automatic Temperature Control System Based on Double-Thermocouple External Heated Crucible-Type Salt Bath Furnace

Author: ZhangYing
Tutor: WangHuaChang
School: Wuhan University of Technology
Course: Materials Processing Engineering
Keywords: Automatic temperature control TD process Transfer function SCM
CLC: TP273
Type: Master's thesis
Year: 2011
Downloads: 81
Quote: 0
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Abstract


The object of this study is the the the dual thermocouple hot crucible salt bath furnace temperature automatic control system. Automatic temperature control system control quality, such as the control accuracy, response speed, automation level, for the smooth progress of the salt bath heat treatment process material properties and processing has a vital role. However, the characteristics of the salt bath heat treatment temperature control system has a large hysteresis and complexity. Traditional temperature control systems, the use of artificial temperature control tranche adjustment method, energy consumption and low quality control is not suitable lag, complex, time-varying temperature control, the conduct of the process to the heat treatment process bring inconvenience and even sometimes can not meet the processing requirements of certain materials. Solve the above problem, find a good solution. The goal of this study is the design of a for outside hot crucible salt bath furnace automatic temperature control system, on the basis of the traditional semi-automatic temperature control system, the use of more advanced automatic control theory, control technology to achieve high control quality temperature control systems. Meanwhile, for the the dual thermocouple hot crucible salt bath furnace, calculate the amount of heat transfer process as well as the system's temperature - heat transfer function, the support of the mathematical theory for the the actual salt bath process. The research content: 1) the use of the PID algorithm through the expansion of the response curve method to the whole set control parameters; 2) computing systems heat transfer amount and export the system heat passing the function relationship style; 3) design of the temperature control system of the hardware, use the microcontroller as the core, state-of-the-art electronic components for the auxiliary hardware system, automatic temperature control; 4) Design of a temperature control system software architecture, system flow chart. This study concluded that: 1) the use of the PID algorithm, and the expansion of the response curve to tuning the control parameters to improve the response speed of the system, to reduce the lag, reducing the temperature fluctuations and improve control quality. 2) the amount of the heat transfer of the system can be quantitatively determined. The heat transfer can be divided into the heat transfer from the power supply to the furnace, furnace incoming crucible causes crucible temperature rise of the thermal process and the crucible of heat to the salt bath such that the salt bath temperature rise of these three processes, the first kind of heat transfer manner electrical energy into heat energy, the second heat transfer including radiation heat transfer and convection heat; the third transfer including radiation heat transfer, convective heat transfer and conduction heat transfer. 3) calculate the system heat transfer function relationships. In order to facilitate the calculation and the simplified model, the calculation of the heat transfer function, only the computing power incoming hearth heat transfer function, the transfer function expression, and the overall heat from the furnace to the crucible salt bath. 4) temperature control system hardware based on the the microcontroller AT89C52 as core components, and high-precision digital converter MAX6675 simplifies circuit, to achieve the automatic control of temperature. 5) software flow chart of the temperature control system can assist system hardware and software design to complete the function. The results of this study have important significance of the the dual thermocouple externally heated crucible salt bath furnace temperature control technology, the actual value can be put into production use.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Automatic control,automatic control system
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