Kin of hot air circulating oven air circulation system uses fans circulating air supply, uniform and efficient air circulation. Wind source is circulating air motor (using non-contact switch) driven by the wind wheel heater, and the hot air sent, and then through the air duct to the oven chamber, and then use the air intake duct after becoming re-circulating air source, heating use. Make sure the room temperature uniformity. As a result of the switch door action causes rapid temperature swings occur asbestos mine oven, air circulation system state recovery operation until it reaches the set temperature. When the oven temperature reaches the set value of Chinese herbal medicines, PID temperature controller output control signal PLC, PLC output control signals to the time relay KT, began holding time, at the same time, closing the intake fan and exhaust butterfly valve. PID control by constantly opening and closing electrical heating, hot air circulation in housing phase heat sterilization. When the heat sterilization time reaches the set value, relay output signal to the PLC, PLC output fully closed electric heating, open water cooling solenoid valve to pull turned on to cool down the housing in phases. When the inside temperature drops ≤40 ℃ when flower oven, temperature controller outputs a control signal to the PLC, PLC output off hot air circulating fan, end of the drying cycle sterilization procedures. PID parameters directly affect the regulation accuracy of the system, it is the core of the control system design. Through appropriate PID parameters, PID control system according to the error characteristics of the oven controlled process, using proportional, integral and differential control system to calculate the amount of the corresponding output response characteristic, the control system to reach a satisfactory control effect. Restore normal PID parameter settings. Kin of hot air circulating oven works Hot air circulating oven air circulation system uses fans circulating air supply, uniform and efficient air circulation. Wind source is circulating air motor (using non-contact switch) driven by the wind wheel heater, and the hot air sent, and then through the air duct to the oven chamber, and then use the air intake duct after becoming re-circulating air source, heating use. Make sure the room temperature uniformity. When the door switch operation caused due to temperature swings occur, the air circulation system quickly restore the operating state, until it reaches the set temperature asbestos mine oven, Kinder dried (certified), oven from Changzhou Jianda Drying Equipment Co. provided. Changzhou Jianda Drying Equipment Co., Ltd. (www.jian-da.com) is a leader in Changzhou, Jiangsu, drying equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Kinder dried in leadership with the staff warmly welcome all inquiries negotiations to create a better health future of drying.