Study On The Optimal Control And Condition Monitoring Of The Belt Conveyor In Coal Mine

Bell conhveyor is the central equipment of coal transportation in our country,Its efficient and reliable operation is directly related to the stable and safe operation of coal mine production system.At present,there ane some problems such as low efficiency,serious energy consumpticon and running failure of the belt conveyor used in coal mine in China,The main reason is that there is a gap between the basic theory and the key technology of the belt convcyor,Therefore the research of this project has a certain promotion effect to solve the above problems,and can produce a large economic and social benefits,and also has important scientific significance and practical ngineeriog significance.The main research contents and innovations are as follows;For analysis of dynamic characteristics of long.distance belt conveyor in coal mine,the belt conveyor dynamic model of different angle is established.Aiming at the four sections belt conveyor system of Shaanxi Province Huangling Jianzhuang coal mine,in seeond section of this system,contains the 15 degrees angle of double drive roller conveyor subsystems in 1200 m belt conveyor system.For the dynamic resistance of the subsystem of the angle of 0 degree,3 degrees and 15 degrees at load-bearing section and the return section in the conveying process of belt conveyor,the redirection roller at the tail,the driving roller in the head have carried on the calculation and fault simulation,in order to provide the basis for the failure predication of the coal mine long distance belt conveyor.In addition,the belt speed and energy consumption,wear and service life of belt conveyor are studied,found the relationship betwees energy consumption,wear and life and the law of the same volume,It provides reference for the design of high bandwidth,low bandwidth and high bandwidth with the same volume of trafric.On the basis of studying the starting mode of long distance belt conveyor system,aim at the coal scattereid problem of the long distance coal mine conve}yor when multistage heavy startting,the intelligent group-starting is presernted for coal mine bell conveyor-system based on Improved stochastic approximation of decision tree(IGSA-ISADT).In this algorithm,condition attribute are selected that are the transmission distance,the belt width and the driving motor power of the belt conveyor subsystem with long distance,the decision tree is used to determine the starting slope of different subsystems.Acceleration section is started according to the the starting slope,and the the uniform section is controlled by the error of randomly approximate to given linear velocity.Group intelligent start is simulated using four level coal transport system with coal transport distance of 3400 meters in Huang Ling Shaanxi a coal mine.The results show that the group intelligence is better than the conventional proportional integral control system,the maximum line speed error is reduced to 4.22%,not only the dynamic error is small but also the running is stable,the algorithm can provide a reference that coal scattered is prevented when heavy startting of coal belt conveyor with multilevel subsystem.Based on the analysis of dynamic characteristics of the long distance belt conveyor and the large dip angle in coal mine,a kind fusion method of Bayes theory and expert system(FMBTES)is proposed which is control method with the change regular of the start process.First,the structure and dynamics model are established for belt conveyor,the priori distributions of The system implementation state is supposed,the conditional probability of dynamics state is made using Bayes theary,next,the change regular of the start process pull force is found,and the change regular of the dynamic resistance is found for belt conveyor,on this basis,the control rule of expert system is established.The FMBTES method is verified in Shaanxi Province Huangling Jianzhuang coal mine,which is large dip angle section of the four sections type belt conveyor system,belt length is 1200m.In the large power driving process of coal belt conveyor with dual-motor,the driving force is not balanced because that static-dynamic resistance of motor and the mechanical characteristic of each roller are different even in same power motor and type roller,this unbalance will generate vibration,making coal scattered.The cause of power unbalance is analyzed and the relationship between the two motors is deduced in physical mechanism in the paper.Aim at the probliem of coal belt conveyor,an algorithm of multistage fuzzy equalization control(MFEC)is proposed,equalization controller’s mathematical model is created,the steps of MFEC algorithm and the ranking rules are deduced.At last,a belt conveyor of double-motor driven is made as a simulation example which is in long distance and large angle of coal-mine roadway.Then the simulation of MFEC is compared with traditional PI control.The result shows that the average error rate of this method is reduced by about 3%.Researching on remote maintenance of coal mine belt conveyor based on cloud computing,it can be get that cloud computing can provide a more secure and reliable guarantee for the daily maintenance of the mine belt machine,so that the belt malfunction can be promptly and effectively addressed.The normal operating status of belt conveyor in coal mine is described,and the causes of common malfunctions are analyzed and the methods of treatment are given.