Dissertation for the degree of candidate of technical sciences in specialty 05.13.07 - Automation of control processes. - Ivano-Frankivsk National Technical University of Oil and Gas, Ivano-Frankivsk, 2021.
The paper analyzes automated control systems (ACS) for the technological process of preparing raw materials for the manufacture of ceramic products, methods and means of identifying metal inclusions (MI) in raw materials on a conveyor belt, and substantiates the prospects of using an ACS equipped with subsystems for identifying and extracting MI, which requires theoretical justification and the development of a subsystem for its implementation.
A functional diagram of subsystems for identification and extraction of MI with a description of its components and a structural diagram of the integration of these subsystems into an ACS for the process of raw material preparation have been developed.
A theoretical substantiation has been carried out and a method has been developed for identifying MI by forming an electromagnetic field and installing an additional coil to form a directional radiation pattern in the area of the investigated section of a conveyor belt with raw materials.
On the basis of the proposed method, functional blocks of the subsystem for identifying MI have been developed - a unit for measuring the electromagnetic force of the receiving coil and a unit for generating an excitation signal and processing the measured electromagnetic force, as well as a block diagram of the subsystem for identifying MI and the principle of their operation.
A subsystem for extracting MI from raw materials, its algorithmic and software has been developed on the basis of the Simatic S7-1200 controller. The subsystem allows the extraction of ferrous MI by selectively switching on electromagnets, depending on the location and dimensions of the detected MI. The subsystem operation algorithm assumes automatic unloading of the extracted MI.
The development and integration of a subsystem for identification and extraction of MI into the structure of an ACS for the preparation of raw materials, which included the development of hardware, communication and algorithmic support, was carried out. In order to ensure the exchange of data between the subsystems for the identification and extraction of MI, the use of the ModBus RTU data transfer protocol is provided. For operational monitoring and control, the KTP700 operator panel is provided.
The subsystem of identification of MI was tested on the developed laboratory installation in the form of a section of the conveyor line equipped with an electric drive, as well as on line No. 1 of the SVP "Plant PROKERAM" LLC "Gold Ceramics", which confirmed its effectiveness.
Key words: automated control system, algorithm, computational model, numerical modeling, identification method, identification and extraction subsystem, magnetic coil system, electromagnetic unit, metal inclusion, software, raw materials.
