Study On Dryer Of PLC Control System For Chinese Medicine

Chinese medicine and Traditional Chinese medicine are valuable legacies that Chinese nation leaves for the people of the world for thousands of years. Develop increasing of the degree of difficulty and people's understanding of their poisonous side effect with the chemical medicines, the demand for the Traditional Chinese Medicine of international market is strengthened gradually, about 27 billion dollars every year. 70 countries, more than 40 big pharmaceuticals are devoted to studying the Traditional Chinese Medicine in the world. The annual Traditional Chinese Medicine export of our country is about 400 million dollars and market share is very low. One of the mains factors is that dry in technique of the Traditional Chinese Medicine of our country is backward. For change current situation, " Traditional Chinese Medicine modernization and industrialization are already listed the most important project of "9.5 "Plan. As the flourishing development and large-scale requirement of domestic Traditional Chinese Medicine pharmacy, it seems increasingly important to computer control of the dry course.Heat pump can draw heat from low-temperature heat source and make it useful in high temperature. Free of external climatic conditions, it runs steadily under the same condition throughout the year, no problem of environmental pollution. Its energy utilization ratio is high, but its operation expense is low.This subject uses heat pump for the dryness of the Chinese herbal medicine because of its major advantage, so it is feasible. Its low temperature will not produce oxidizing and such phenomena as chemolysis, so it can well ensure the quality of the dried medicines' color, appearance and effective compositions, etc.Control heat pump dry device with PLC of series S7-200 of Siemens Company, fuzzy-control mechanism and Fuzzy PID parameter control method are introduced in the course of control, have strengthened the adaptability to the uncertain factor of system.Adopted the main and the subordinative machine, it is realized adjustment and control of the monitoring of each important operating mode parameter in the drysystem operation course of the heat pump, then can reduce the artificial fault that monitor, regulate lag behind systematically, improve the systematic precision of regulation and sensitivity, we can get better control effect through testing.Utilizing this device, we can determine the dry course curve and dry speed curve. The experimental data can offer reference for implementation of the dry course whole craft of crude drags.Combined measuring, sensing and control technology together and applied to the heat pump dryer, which can realize the whole automatic control to the dry processing course, reduce and operate cost and dry energy consumption, improve medicines quality, thus remedy the deficiency in the dry respect of Chinese herbal medicine.Chapter one of this text has introduced dry current situation and dry method about the Chinese herbal medicine both at home and abroad; Chapter two has expatiated operation principle and application situation of heat pump and feasibility of heat pump to Chinese herbal dryness; Chapter three introduced structure and working course of the heat pump dry device, having designed control system, including the application of S7-200 PLC, choice the variable and measure the component and join circuit, etc; In allusion to the target's characteristic, the control course has been added to fuzzy-control and fuzzy PID parameter fixed method. It has introduced emphatically the fuzzy regular choosing and implementation in chapter four; S7-200 and WinCC configuration software, realize that the dry device of the heat pump is monitored, controls online, set up friendly man-machine interface. The realization course of the aforesaid control algorithm and programming of S7-200 and configuration course of WinCC have been introduced in detail in chapter five; Chapter six to test one group data in go on and analyse, prove this heat pump dry device observe and control system can use dry production of Chinese herbal medicine for directly; Chapter seven summarize work that the author does, and form the direction in which promote my work further.