Research On Temperature Field Of Sintering Furnace And Design Of Control System

At present,China is the world's largest consumer and producer of powder alloys,but the current production of powdered alloy sintering furnaces mainly depends on imports.Therefore,our country is dedicated to the research of high-performance sintering furnacesand supporting control systems with very important application value.In order to better improve the performance of the sintering furnace,this article introduces two parts of the study of the temperature field and the design of the control system.Combining with the actual project,the control system of sintering furnace based on PLC was designede Based on this,the temperature control system of embedded sintering furnace was studied.For this reason,this subject mainly discusses from three aspects.Temperature field simulation of sintering furnace:Firstly,the structure of the sintering furnace and the internal heat conduction are introduced.In order to study the distribution law of the dynamic temperature field in the sintering furnace,the theory of finite element is used as the theoretical basis for modeling research.ANSYS software was used to establish a simulation model for the sintering furnace.A new simulation model was established by changing the shape of the heating body and the lining structure to simulate the temperature field,and the temperature distribution close to the actual temperature was simulated.Observe the changes of the temperature field of the sintering furnace under different structures,thus providing an effective optimization guidance for the design of industrially heated graphite bodies.Based on the design of the sintering furnace control system:The sintering furnace control system based on PLC is designed.The control system is designed from three aspects:temperature,pressure,and vacuum.Considering the problem of heat dissipation from the door,the top surface and the bottom surface,the control system uses multiple temperature zones to control each temperature zone separately.The controller adopts FP93 meter,which has self-defining function of parameters,can switch between regular PID and Fuzzy auto-tuning PID mode according to the actual temperature and set temperature difference,adjust the heating power of the power regulator,FP93 instrument output 4-20MA The current signal is used as the power regulator's control signal;the hydraulic system can perform two kinds of control,pressure control and displacement control,and the pressure uses a pressure sensor to send the collected pressure signal to the PLC via a pressure transmitter for closed-loop PID control.The degree of vacuum is controlled by a vacuum system and a PLC.The vacuum system is a two-stage system.The furnace is first rough-drawn,heated and pressurized to a certain level,and refined.At the same time,the MCGS touch screen is added to make the system more efficient.Tends to improve.The design of embedded sintering furnace temperature control system:Due to the high cost of PLC and instrumentation,in order to improve the cost-effectiveness of the system,a more optimized man-machine interface was designed and the temperature control was designed for embedded design.The LPC1788 microcontroller with ARM Cortex-M3 architecture was used as the main control unit to complete the design of software and hardware,the task scheduling mechanism of the embedded ?C/OS-? system,and the construction of the embedded development environment and the writing of the underlying drivers.The man-machine interface uses the LCD liquid crystal touch-sensitive screen,has transplanted the ?C/GUI graphical user development software successfully,has completed the rich human-computer interaction function.The embedded sintering furnace temperature control system designed achieves the desired results.