Extraction of traditional Chinese medicine is an important part of the production process of traditional Chinese medicine. The automation of Chinese medicine extraction process is an important part of the modernization of Chinese medicine industry. How to apply automatic control technology to Chinese medicine extraction process has received more and more attention. This paper discusses the related issues in the design of automatic control system for Chinese medicine extraction production line and the reader. [Key words] Chinese medicine extraction; control system I. Characteristics of Chinese medicine extraction production process In the process industry, intermittent production process and continuous production process are widely used. The batch production process, also known as the mass production process, belongs to the production process of producing a certain amount of products according to a given formula. The traditional Chinese medicine extraction production generally adopts the mass production process, that is, according to a given formula, a certain amount of Chinese medicine extract is produced. The traditional Chinese medicine extraction production formula mainly includes: the produced product and its raw material components; the required production equipment; the required production operations (such as heating, stirring, precipitation, etc.). Second, mass production process control technology 1, intermittent control model Intermittent production process control can be divided into two parts, namely: real-time control layer and production management layer, real-time control layer can include: real-time production management, sequential control, discrete / adjustment control, Process chain, safety chain, process I/O; production management can include: production planning, production scheduling, recipe management, etc. 2. Types of Common Intermittent Control Systems According to the degree of automation of intermittent production processes, the control system can be divided into program intermittent control and integrated intermittent control. The program intermittent control system generally refers to the control system that completes the real-time control layer function. The integrated intermittent control system includes all Intermittent control of the content in the model. Third, the design of Chinese medicine extraction computer control system According to the current situation in China, traditional Chinese medicine manufacturers generally divide the integrated intermittent control system into two parts, namely the production management part (for example: ERP) and the real-time control part. The Chinese medicine extraction computer control system discussed here refers to the real-time control part, that is, the program intermittent control system 1. The designed Chinese medicine extraction computer control system is available for design goals. n Production process Remote computer control, monitoring n operation and control are flexible, rapid, accurate, Consistent n Shorten the production cycle of each batch of products n Optimize control, improve raw material, energy and equipment utilization, reduce scrap rate n Computer control parameter management n Computer production history Data storage, query and report printing n Process chain n Reliable safety chain control n Alarm n Electronic signature 2, typical control system scheme 2.1 Typical Chinese medicine extraction process and traditional Chinese medicine extraction production line Traditional Chinese medicine process: Medicinal material -> Washing -> Drying -> Chopping -> Water extraction three times -> Filtration -> Storage->Decompression-concentration->->Spray granulation->Repaste->Low-temperature drying->Reconcentration->Precipitation->Separation->Decompression-concentration->Re-precipitation extraction of active ingredients of modern Chinese medicine preparation process: Medicinal materials ->washing->drying->crushing->water extraction three times->filtration->resin adsorption->water washing->elution->concentration under reduced pressure->alcohol precipitation->filtration->decompression thickening Reduced->low temperature drying or spray drying->finished products Chinese medicine extraction production line can generally be designed as a dedicated single production process line; dedicated multi-production process line; reconfigurable, multi-production process line. Production lines often use two layout methods, pipeline layout and partition layout. With the layout of the pipeline, the process and equipment layout can be seen at a glance, while the sub-region layout saves space. 2.1.2 Typical Chinese medicine extraction equipment and its basic operation control 2.1.2.1 Extraction tank control (manual / automatic) Chinese medicine solid-liquid extraction Zui commonly used equipment is extraction tank, generally divided into dynamic extraction tank and static extraction The canister and the plurality of extraction cans form a pull-out device. The basic operation control of the extraction tank generally includes the following contents: leak detection control, quantitative addition of solvent, manual feeding, temperature rise control, constant temperature timing, boiling timing, timed circulation, timed stirring, discharge control, alcohol reflux, aromatic oil recovery, slagging Control, backflush control, direct steam control, cleaning control, boiling pot, alarm, safety interlock. 2.1.2.2 External circulation single-effect evaporator external circulation single-effect evaporator, consisting of heater, evaporator, separator, etc., mainly used for alcohol recovery in the fields of pharmaceutical, botanical, chemical, food, dairy and other fields. With concentration, it can also be used for concentration of liquid. Basic operations include: dosing, heater steam pressure/temperature control, evaporator vacuum control, cooling water flow detection, cooling water temperature detection, density detection and paste control, automatic defoaming, level control, condensate drain or Solvent recovery control, cleaning control, cooking tank control, etc. 2.1.2.2 Double or multi-effect concentrator Double or multi-effect concentrator consists of two or more heaters, evaporators, separators, etc. It is suitable for concentration of liquid in pharmaceutical, botanical, chemical, food, dairy and other fields. The basic operations include: quantitative feed, heater steam pressure (temperature) control, evaporator end effect vacuum control, cooling water flow detection, cooling water temperature detection, dumping control, density detection and paste control, automatic defoaming, liquid Position control, condensate discharge control, cleaning control, cooking tank control, etc. 2.1.2.3 Stirring sedimentation tank control Stirring sedimentation tank is mainly used for alcohol precipitation of traditional Chinese medicine, food, health care products, chemical industry, etc. The basic operations include: feeding, adding ethanol according to the ratio, stirring, sedimentation timing, cooling control, discharging, slagging, cleaning. 2.1.2.4 Solvent Configuration Tank Control The solvent configuration tank is mainly used to configure the concentration of alcohol. The basic operations include: detection of refined ethanol concentration, detection of dilute ethanol concentration, calculation of the amount of refined ethanol, dilute ethanol and water according to the required concentration and configuration amount, adding refined ethanol, dilute ethanol and water according to the calculated amount, recycling, temperature Control, concentration detection. Source: Modern Chinese Medicine Network
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