The Application of PLC in the Temperature Control System of Tunnel Kiln
Tunnel kiln is an important thermal equipment in the modern brick and tile industry, which is widely used in the firing of refractory products. In order to make the tunnel kiln better serve the production, the automatic control level in the production process is extremely important.
Ceramic tunnel kiln production lines include: light-gas energy-saving tunnel kiln, roller kiln, double-kiln gas-saving energy-saving kiln and other forms. It is suitable for the firing of honeycomb ceramics, daily-use ceramics, industrial ceramics, sanitary building ceramics, electronic ceramics, chemical raw materials, ceramic pigments and other silicate products. It is characterized by high degree of automation, uniform temperature in the kiln, wide adjustment range, low energy consumption, high firing quality, simple operation and convenient maintenance. The firing temperature of the light-body tunnel kiln is ≤1650℃, and the kiln length is 20 to 120 meters.
There are more dust, oil stains, and steam in some links. The harsh working environment will have an adverse effect on the electrical control system, so the electrical control system is required to have good performance and strong anti-interference.
According to the actual requirements, the system adopts PLC control scheme. The PLC system has strong anti-interference ability and computing ability, and is highly reliable and easy to realize complex control. Therefore, it is very suitable to choose PLC as the control core of tunnel kiln temperature.
This system uses Siemens S7-300 series CPU + OYES-300 series IO module + OYES-300 series IM153 module. The communication between the master station and the slave station is realized through the Profibus network; the host computer in the central control room communicates with the on-site host computer through the MPI network to monitor the temperature, transmission speed, heating process and other parameters in the production process in real time.
1. There are many temperature control points in the system and the environment is complicated
2. OYES-300 series modules:
(1) The product is photoelectrically isolated and has strong reliability;
(2) Rich variety and strong compatibility;
(3) High cost performance;
3. DP communication mode, strong openness
Concluding remarks:
Practice has proved that under the harsh working conditions of strong interference and high frequency in the ceramic factory, the equipment operates reliably and improves the production efficiency. The system is compact in structure, flexible in expansion, easy to maintain, and can easily change the application program according to the requirements of the process and working conditions, and enhance the control function.
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