Control system for continuous microwavevacuum
drier of Chinese herbal medicine
XV Feng, WANG Wei, WANG Cong, ZHANG Jiayuan
(Jilin Province Academy of Agricultural Machinery, Changchun 130022, China)
Abstract: Aiming at the high level of automation which is needed in the process of the Chinese herbal medicine continuous microwavevacuum drying, the PLC, touch panel and other automation and manmachine engineering technology were introduced to the process of the Chinese herbal medicine continuous microwave vacuum drying. And the control system for continuous microwavevacuum drier of the Chinese herbal medicine was designed. This control system was composed of PLC, touch panel, material conveying mechanism, frequency regulator, refrigeration unit, water collector, vacuum pump, microwave unit, electromagnetic valve and a series of sensers. And the structure and principle of the control system for the Chinese herbal medicine continuous microwavevacuum drying were studied. At the same time, the type of PLC , touch panel and the important sensers was chosen and the program was designed and tested. The system running results indicate that the Chinese herbal medicine continuous microwavevacuum dryer is robotized. As a result, the reliability of Chinese herbal medicine dryer is improved.
Key words: Chinese traditional drug drying; control system; PLC; touch panel