| According to the distribution of energy "lean,rich in coal,less gas," and coal as the main energy sources,in a very long period of time will not change.Shearer is important mechanized coal mining equipment,its performance will have a major impact on the economic benefits of coal.Currently,during the structural design of shearer drum and traction unit load is still using the empirical formula to estimate,often resulting in insufficient strength related parts or surplus in the drum,showing excessive wear and cutter cutting specific energy consumption too high,the traction unit,mainly for road wheels and the guide shoe abnormal wear and walking round off the teeth.With the increase of installed power,Shearer work process failure rate also increases,more traction part failure problems highlighted,a major factor restricting our Shearer Shearer to international high-end development.Therefore,to carry out research studies shearer cutting load characteristics and dynamic characteristics of the traction unit has become a hot issue many scholars study,which not only has important theoretical significance,but also has important application value.In this paper,multi-cutter Shearer spiral drum and shearer haulage unit for the study,summarized the experimental study cutter cutting coal and rock,the study load of reconstruction algorithm,shearer haulage unit of dynamic characteristics and related development and Research Status field.In a comprehensive analysis of existing research methods and techniques on the basis of the existing research clearly we need to further explore the issue,determine the contents of this paper.The main research work mainly as follows:In order to solve the mathematical description of the drum load and traction system dynamics analysis,the traction load problem with this mathematical boundary conditions described by many spiral drum picks stress analysis,using B-spline curve established picks,etc.when the effect of cutting resistance model,the drum cutting cutter axial load resistance and the associated mathematical model to derive the mathematical correlation equation further cutting drum between the load and the test load,resulting in a multi-domain load roller picks Reconstruction model,large lump coal caving based on stochastic theory to Rayleigh random distribution theory,through the establishment of pick cutting resistance autocorrelation model,gives more random picks drum load spectrum reconstruction algorithm;Cut from the mathematical description of load cut start to shearer drum cutting coal and rock theory,a similar theoretical basis,the use of dimensional analysis,the establishment of a single linear cutter cutting coal and rock bench,were single tooth straight cutting coal and rock experiments,preliminary exploration of the cutting load variation;pulverized coal,cement,water as raw materials,according to a certain proportion of coal and rock samples obtained,were coal and rock uniaxial compression test,won the coal samples mechanical properties,the establishment of a coal and rock nonlinear viscoelastic constitutive equation,instability and failure of coal and rock necessary and sufficient conditions;self-developed multi-adjustable parameters rotary cutter for cutting coal and rock experimental device,and use of the device to drum cutting load tested,get a different wedge angles,different traction speed,load test curve of different cross-sectional shape of the lower tip of the tooth,the tooth tip of the wedge angle,pulling speed and shape of the prongs of coal caving characteristics and impact loads of cutting-depth analysis;The use of the best squares approximation method for single tooth cutting resistance curve fitting of extrema were obtained under experimental conditions,a single cutter cutting load of mathematical equations describing;the use of the second chapter theory,experiment payload reconstruction and the improved FFT algorithm gives more mathematical equations cut tooth random loads;use of existing experimental data,using the ARMA model and ARIMA model for a multi-cylinder picks random load spectrum of forecasting;The establishment of a shearer mechanics model,through stress analysis,have been incompatible singular linear equations machine mechanics model,the use of a modified double successive projection method,equation understand count,got different seam dip under the force of each shoe curve;by analyzing the relationship between shearer cutting unit and the traction unit related parameters,a mathematical model of the traction load associated with the drum load,obtain the boundary condition of the traction drive system dynamics analysis;centralized mass distribution model and the method of combining the quality of the model,the establishment of a shearer haulage unit mechanical model;taking into account the distribution of the quality of the traction unit shafting torsional vibration system,the traction unit transfer matrix derived torsional vibration system,to vibration characteristics of torsional vibration system is analyzed to obtain the torsional vibration system natural frequencies and vibration modes;each axis elastic energy evenly distributed as the optimization target,the planetary gear unit output shaft torsional stiffness and walking axle as optimization parameters,use drop gradient algorithm parameters torsional vibration system optimization;When considering walking round engagement with the pin row spacing elastic deformation of the tooth surface changes and pin bus connections,the establishment of travel agencies mechanical model and simulation model to analyze the dynamic excitation pin gear transmission process,using a new method--rank 1 Quasi Newton method for travel agencies kinetic equation is solved;analysis of the walking round bending stiffness,pin gear mesh stiffness and rigidity of the connection pin rack running gear dynamics,and the simulation results of the regression analysis to give the mathematical expression walking round speed fluctuation amplitude and pin meshing force amplitude.Global analysis and local analysis using a combination of methods,to pin gear transmission chaotic behavior of nonlinear systems identification to obtain a system with different parameters of dynamic characteristics,study the dynamic characteristics of the system under the preferred parameters. |
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