Improving the Quality of Ground Coffee "Arabica" by Using the SCADA System to Automate the Volumetric Dosing Process

The article is devoted to improving the efficiency of the production technology of ground roasted coffee “Arabica” by using automatic volumetric rotary dispensers as automation objects, and creating systems based on them for automatic control of the process of dispensing ground roasted coffee using the Scada system. The article defines the relevance of the topic, and examines the quality indicators of ground coffee of the “Arabica” variety. It is shown that during the dosing process, problems arise with the stability of the supply of ground coffee to the dosing mechanism and the ability to automatically control the resulting arches. Therefore, experimental studies and modeling of the flow of ground coffee from the dispenser hopper using discrete element methods have been carried out. Methods and methods of automatic control of coffee quality indicators using the Scada system have been developed and tested. The results of the analysis of the technological process of dosing ground roasted coffee as an object of control are shown, and the review of existing control systems for the processes of dosing bulk masses is carried out. The result of the research developed a model of process control dispensing of the ground coffee, which allows to study random perturbations of the speed change actuator of the feeder and the rotary valve, and change the properties of ground coffee. The influence of external disturbances on the level of action is studied. The obtained data allowed us to choose as a control criterion the specified productivity of the technological line of the dosing process with restrictions imposed on it on fluctuations in the volume mass of ground coffee in the package. The obtained results of simulation experiments conducted in the MatLab environment using the SCADA system allowed for more accurate stabilization of the ground coffee level under conditions of fluctuations in the properties of ground coffee than under the previously used positional control law. The results of simulation of the process of managing the dosage of ground coffee showed that among the factors listed in the statement of the simulation task, there are several such factors, the variation of which clearly affects the productivity and accuracy of the process of dosing ground coffee. These include: the law of forming a control effect that compensates for changes in the physical and mechanical properties of ground coffee, as well as random disturbances from changes in the speed of the feeder and volumetric dispenser drives. These factors allowed us to study their influence on the level of ground coffee in the hopper. Simulation experiments with various distributions of volume portion of ground coffee is loaded into measuring cups dispenser, allowed to show the promising applications of the SCADA system and use it to provide a more accurate stabilization of the level of ground coffee than using the positional control law in terms of oscillation properties of ground coffee.

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