Tunnel furnace is a number of industrial production enterprises commonly used heating equipment, it is generally tens of meters long, 1 meter wide. The baked product is placed on the conveyor belt in the center of the tunnel baking oven and is baked from the end of the furnace into the furnace and then moved in the furnace at a certain speed of movement and finally from the other end of the furnace. Furnace temperature distribution curve requirements unchanged, the temperature range is generally between 0 ~ 1000 ?, can be divided into preheating, firing and cooling of three zones. The automatic control of the furnace temperature is controlled only by selecting a number of representative temperature points in the tunnel furnace. The technical index of the system has the rated power of the resistance furnace of each heating point is 1 ~ 8kw, the rated voltage is 380v (three phase); the number of temperature control points is 1 ~ 64; the temperature overshoot is 10%; the temperature control precision is 0.5%; speed control accuracy of 5%; temperature range of 0 ~ 1300?; Speed ​​range of 0 ~ 6000rpm.

Function: can choose to measure two stoves at the same time, 1 ~ 64 points temperature and production line speed, which temperature thermocouple measurement, with cold junction temperature automatic compensation, thermocouple linear processing and digital filtering; can display the Point set and the actual temperature (speed) of the value and graphics; with data retention function, and can display the actual temperature / speed of the historical curve; can be set or modify the temperature of the point (speed) Value; with overrun and thermocouple intermittent sound and light alarm function, and can be set online or modify the temperature (speed) of the upper and lower limits of the alarm value; online selection of dual-mode control or fuzzy PID control or other advanced control Algorithm, and has the output limit and anti-integral saturation function to improve the system's dynamic adjustment of quality, control parameters can be set or modified online to achieve the best control effect; can print a variety of charts and data; also has a help function; The use of Taiwan's Advantech industrial control computer, the output channel using optocoupler isolation, the output signal generated by a small harmonic interference control input voltage added to the number of solar components of the way, the system has a strong anti-jamming capability; Less input, man-machine interface intuitive, easy to operate and so on.