A glass tempering furnace (glass tempering furnace) is a device for producing tempered glass by a physical or chemical method. Tempered glass is a technology that heats the flat glass and then quenches it, which causes compressive stress on the surface of the glass after cooling. Tensile stress is formed inside the glass, so as to increase the strength of the glass and make the ordinary annealed glass a tempered glass. This method has the characteristics of high production efficiency, short cycle, good safety and low cost. It is widely used in the production of toughened glass. The process flow is as follows:
The glass tempering temperature is about 630°C. When the glass reaches this temperature, the space temperature in the furnace should reach more than 700°C, and the temperature of the electric heating wire of the glass tempering furnace should reach 900°C or more. Glass surface temperature is an important factor affecting the quality of tempered glass, so the control of the glass surface temperature is critical. In addition, in the glass tempering process, it is necessary to store in the glass tempering furnace for a certain period of time to ensure the quality of the tempered glass. Therefore, it is very important to monitor and control the temperature of the glass surface and the space temperature in the furnace at all times.
Generally, each glass tempering furnace needs 100-200 or more temperature collection points. These temperature collection points are located on the upper and lower layers of the heating furnace respectively. These collection points have a certain distance from the control cabinet, so they must be fast and accurate. The acquisition of temperature at low cost is a focus of the tempering furnace equipment. Temperature control system: The first British technology C-4018 + thermocouple dedicated temperature acquisition module, each heating zone is equipped with a thermocouple, according to the thickness of the glass and the different varieties, set the temperature on the operating terminal, temperature control module based on measured The temperature is calculated and the control signal is output to the solid state relay so as to control the output power of the heater and the temperature control is very accurate. Solid-state relays have stable performance and reliable operation, and are very suitable for such applications. After successful application, customers have consistently given high praise.
System Components:
The system consists of a touch screen, IPC, PLC and the first British technology temperature acquisition module C-4018+ or C-7018. Through the touch screen to set, access, display process parameters and set and display temperature; IPC as the host computer to complete the data display and storage; PLC to complete the entire process and temperature control, the first British technology C-4018 + or C- 7018 replaces the original part of the PLC analog acquisition, greatly reducing the production costs, the furnace has 60-300 temperature measurement points depending on the size, using 8 data acquisition module C-4018 + or C-7018 the number of 9- 42 different, responsible for the temperature data collection in each district
Based on CEILING's C-4018+ temperature acquisition solution: C-4018+ thermocouple input module, each module has 8 channels, can simultaneously collect 8 temperature signals, the sampling rate of 10 sampling points per second can be satisfied Temperature control speed. 16-bit resolution, high resolution of temperature, easy to achieve fine temperature acquisition and control, production of more different types of products; 8 channels can increase the number of temperature control loop, facilitate more detailed temperature control; With cold junction compensation, no additional configuration.
Note: IPC converts RS-232 serial port to RS-485 serial port and C-4018+ via C-7520. In the configuration software or the high-level programming language VB or VC, 8 temperature acquisitions of each module can be read out at a time via the Modbus protocol or the ASCII protocol, and other modules are sequentially queried. For example, if the temperature collection point is at 200, it needs 25 modules. In the heating furnace, it is divided into upper and lower layers. Two RS-485 buses and C--4018+ connections are connected through two serial ports, and polling is performed in turn.
Conclusion: The first British Technology C-4018 + temperature acquisition module to meet the temperature of the steel furnace system requirements for acquisition, fast acquisition speed, a wide collection of points, can quickly reflect the glass surface and furnace temperature changes, and constantly monitor the temperature changes in order to be able to effectively adjust Furnace and glass surface temperatures ensure product quality. It also has strong anti-jamming capability, stable operation in harsh industrial environments, significant savings in capital, assurance and improvement of product quality, reduction of defective product rates, increased production, improved efficiency, cost savings, and increased profit margins.
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