The inside of the hot air circulation bellows is usually equipped with its own circulating fan, through which the wind is brought in, and then through the heater, through the oven, the heated wind is taken out. Then, the air that has been heated once is re-introduced into the machine to become a wind source, and the second hot air circulation is used for heating and reuse. This kind of equipment is generally used for processing and baking some articles. Through the hot air circulation oven, the things to be baked are fully heated and dried, which is extremely efficient and energy-saving.
The temperature control of the hot air circulation oven box adopts GCD-23A intelligent computer temperature control and PLC automatic control system. The temperature signal is collected by platinum resistance. The temperature controller is compared with the set value to obtain the PID control signal. At the same time, PLC The programmable controller output control signal controls the solid state relay SSR to conduct, and the solid state relay controls the heater heating to make the cabinet warm and dehumidify.
When the temperature reaches the set value, the temperature controller outputs the PID control signal PLC, and the PLC outputs a control signal to the time relay KT to start the heat preservation timing, and at the same time, close the inlet fan and the exhaust disc valve. The electric heating is continuously opened and closed by PID control, and the box body is in the hot air circulation heat preservation and sterilization stage.
When the heat preservation sterilization time reaches the set value, the time relay outputs a signal to the PLC, and the PLC outputs the full closed electric heating, and the water cooling electromagnetic valve is opened to make the suction and conduction, so that the box is in the cooling and cooling stage. When the temperature inside the box drops ≤40 °C, the temperature controller outputs a control signal to the PLC, and the PLC output turns off the hot air circulation fan, and the dry sterilization cycle program ends. TEED-2001K over-temperature alarm temperature controller output signal controls PLC's whole program operation, platinum resistance PT100 test signal to alarm temperature controller compares with over-temperature alarm setting temperature value, when the actual temperature value is lower than the set value, the output The control signal is sent to the PLC, and the PLC program runs normally.
When the actual temperature value exceeds the set value, the control signal is output to the PLC, and the PLC closes the running program. Therefore, the setting value of the over temperature alarm is generally higher than the set value of the working temperature.
The moisturizing and safety of the hot air circulation oven is guaranteed. Its operation is very stable, the material drying is relatively uniform, and the corresponding temperature can be automatically adjusted, which is intelligent and convenient.
Of course, in use, we should pay attention to whether the items that need to be dried and heated in the hot air circulation oven are placed too much, whether the exhaust ducts remain unobstructed, and so on. It is necessary to first keep warm for one hour according to the operating instructions, and then the hot air circulation oven can perform intelligent automatic operation. At the same time, the corresponding equipment in the oven should be illuminated according to the order, which is normal. We should also pay attention to the setting of heating time. Heating for a long period of time is likely to cause the glass container inside the oven to be broken, which also leads to an increase in power consumption.
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