| "Automation" and "less humanization” of mechanized mining face are of greatsignificance for improvement of coal mining safety. The key to the implementation ofmechanized mining face automation is to conduct reliable remote monitoring, controland fault diagnosis for mechanized mining electromechanical equipments which willachieve "less humanization" of mechanized mining face. As one of three-machine inmechanized mining face, electrohydraulic powered hydraulic support is an importantsupport equipment of modern coal safety production. The key to achievingmechanized mining automation is to achieve remote monitoring for electrohydraulicpowered hydraulic support. This paper studies remote monitoring system forelectrohydraulic powered hydraulic support which is an important subsystem of three-machine collaborative remote monitoring system in mechanized mining face, themain content includes:(1) According to the function requirements of electrohydraulic poweredhydraulic support remote monitoring system, the architecture of the system wasanalyzed and hardware platform of remote monitoring center was built.Communication algorithms and protocols of support in mechanized mining face wassdudied to achieve real-time transmission of information between the supports. Theremote monitoring system for electrohydraulic powered hydraulic support wasdeveloped, by which real-time informations about status, operation and fault alarm ofelectrohydraulic powered hydraulic support could be abtained in the distance, anddatas of electrohydraulic powered hydraulic support could be collected and archivedso as to be inquired.(2) A support push fuzzy controller was designed to the question thatelectrohydraulic powered hydraulic support couldn’t push orderly in timed push.Support push time fuzzy intelligent control based on operating experience and expertknowledge was achieved with the deviation of road emulsion pressure feedback valueand set value as input and the deviation rate as output. Support push fuzzy controlalgorithm was proposed and the problem that push time of support was real-time fixedcan be solved by inputing fuzzy query table to support controller in which support canautomaticly query corresponding control output in automatic abstracting process.(3) After electrohydraulic powered hydraulic support fuzzy controller wasmodeled, a simulation test about electrohydraulic powered hydraulic support fuzzy control system was conducted based on Simulink. The result showed that the supportfuzzy control system designed was of advantages such as overshoot was small,response time was short and errors was small etc, and push time of support can beadaptively adjusted to pressure change of emulsion.(4) A new communication algorithms and protocols was proposed against theproblem of communication delay when PC polls CAN bus, and real-time andaccuracy in the process that the electrohydraulic system send sensor data and faultinformation to the monitoring host were tested in technical examination spot.The system had been put into use in China Pingmei Shenma Group No.6Mine22210mechanized mining face in March2013. The field application proved that thesystem reached the requirements of desired function. The system can improve theautomatic control level of electrohydraulic powered hydraulic support and offerexcellent social and economic effectiveness. |
PDF Full Text Request