Development Of The Centralized Control System For Mechanized Mining Face

The project in this thesis is one of the sub-project “Research and Development of the Technology and Equipment of Fully Automatic Domestic Unmanned Fully Mechanized Coal Mining Face”(NO: 20111101024) sponsored by the Shanxi Science and Technology major projects. It is proposed on the issue of manual control of equipment of fully mechanized mining such as low production efficiency, high labor costs, security risks and low degree of automationCurrently, mechanical coal mining equipments of our fully-mechanized working face, most of which have real-time monitoring system, can be controlled by electric control system. But for completed fully mechanized coal mining face, the automation level is low and mechanized mining operation process still can not be separated manually operating control. The manually control mode not only labor-intensive, but also lead to accidents by misuse. A mechanized mining face centralized control platform, which can real-time monitor and control fully mechanized mining equipment such as shearer, hydraulic support, scraper conveyor, loader, crusher, pumping stations, trough belt conveyor and video system, was constructed. In this way can reduce the number of fully mechanized mining face labor personnel, reduce accidents caused by misuse of incidence. Therefore, the development of fully mechanized coal face centralized control system has a very important practical significance to the construction of coal mine automationA comprehensive investigation about mining equipment onboard control system to conduct was completed at Ancient Academy Coal Mining, and coal mining technology of fully-mechanized working face was analyzed. After literature reviewing about automation research of fully-mechanized working face at home and abroad, according to the requirements of the task book, the overall framework of centralized control system for mechanized mining face had ultimately been designed. The system was mainly controlled by industrial computer, and the structure of the two stage control network is composed with the airborne controller. The fully mechanized coal mining equipment could be monitored through the airborne controller to collect field data of the fully mechanized coal mining equipment in this system.Considering the communication mode of airborne controller, the TCP/IP communication mode is adopted in this paper. In this way, hydraulic support electro-hydraulic control system and transportation three machine monitoring system could be connected to centralized control system of fully mechanized coal mining face. Some status informations of field equipments, such as before/after the column pressure, hydraulic push against displacement of hydraulic support, motor's current and temperature, speed reducer' oil level and temperature, and cooling water's flow rate and pressure of transport three machine, could be displayed in the HMI.Based on the realization of remote monitoring, around the shearer, cooperative control methods between shearer and hydraulic support, shearer and transport equipment, shearer and video system were proposed. The inner action relation of fully mechanized coal mining equipment was discovered, according to coal mining technology, cooperative control program was edited.The memory cutting path of shearer is unchangeable, with the change of coal seam, the gangue content is unstable in the coal drop. Aimed at this problem, optimization of cutting path of shearer based on genetic algorithm was used, to ensure the gangue content is minimum in the coal drop. Vibration signal of cutting part was decomposed by wavelet pack analysis, and characteristic signal of cutting coal, rock and coal-rock was extracted. Combining with cutting motor current, the adjustment dirctiong of shearer drum was judged. Then regulation of shearer drum could be calculated by genetic algorithm, according to constraint condition of shearer cutting coal.The experimental test platform of this system has been build in our laboratory. Laboratory operation results show that hydraulic support electro-hydraulic control system and transportation three machine monitoring system could be connected to this system; the functions of real-time online monitoring, remote manual control and remote automatic control were achieve. In the test, ehe system data transmission delay was less than 1s, communication rate reached 2Mbps, each sub-system did not appear in the process of data transmission congestion, and the centralized control system did not appear Caton.