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Availability Study of a Longwall Shearer Including Phases of its Operation

Brodny Jarosław, Brzana Estera

Multidisciplinary Aspects of Production Engineering

2021

Vol. 4, Iss. 1

200--211

The mining production process includes a number of sub-processes, the most important of which is mining the rock mass. In this process, increasingly modern mining machines are being used to replace human labor and to achieve high productivity. Full utilization of the potential of these machines is of great importance for the efficiency of individual stages and the whole process of mining production. In the process of mining the rock mass, the use of machinery of a mechanized longwall system is of fundamental significance. Their availability, efficiency and reliability significantly affect the efficiency of the whole mining production process. The paper refers to the availability of a longwall shearer as the basic machine of a mechanized mining system. Based on the analysis of diagnostic signals, recorded by the industrial automation system, the availability of the longwall shearer was determined for 10 selected cycles of its operation. The analysis also included the phases of these cycles, treated as separate periods of the shearer’s work. This division is a consequence of a great difference in the character of the shearer’s work in particular phases of the operating cycle. The analysis covered the phases of cutting, mining and shunting. The determined temporal waveforms and the shearer’s availability in these phases show their great diversity. Therefore, the results indicated the necessity to analyze the operation of mining machines in their characteristic periods, which can be the basis for minimizing unplanned interruptions in their operation and improving the efficiency of their use.

Interfejsy sygnałowe pomiędzy urządzeniami systemu sterowania w powiązaniu z funkcjonalnością i diagnostyką urządzeń

Nowara A., Chmiel M.

Elektronika : konstrukcje, technologie, zastosowania

2007

Vol. 48, nr 11

90-92

Opisano działanie interfejsów sygnałowych pomiędzy urządzeniami systemu sterowania, jak i metody wykorzystywania ich właściwości do określania stanu maszyny i zapewnienia efektywnej diagnostyki. Aspekty techniczne odnoszą się do technicznych parametrów interfejsu, definicji sygnałów i metod komunikacji, zaś organizacyjne do zdefiniowania koncepcji systemu sterowania, interfejsu człowiek-maszyna, grupowania sygnałów i określenia priorytetów oraz czasu działania maszyny i efektywności sprzętu. Artykuł zawiera koncepcję systemu sterowania wykorzystującego PLC z różnymi definicjami interfejsów.

Functionalities of such interfaces are described as well the methods of usage their properties to apply the posibilities to determine machine status and provide machine diagnosis effectively. Technical aspects refer to technical parameters of the interface, signal definition and communication methods. Organisational aspects combine definition of control system concept, machine-man interface, signal grouping and priorities definition, machine uptime and equipment efficency, The concept of control system based on PLC with different interface definitions based on aspects mentioned above is described.