| Easy mining area in our country greatly reduced, which make increasing of high-power shearer under complex geological conditions in the application of thick coal seam mining area. How to ensure high-power shearer in thick coal seam mining area still has high reliability, so as to realize the high-efficient and high-yield of fully mechanized working face is one of the problems urgently to be solved in current coal industry. Based on the research of forced state of the high-power large-mining height shearer under different working conditions and combining sliding boots stress change rule, the traditional traction mechanism of shearer is redesigned as the traction institutions which has hydraulic floating adjustable posture system——shearer hydraulic floating adjustable posture traction institutions. And complete the study of the feasibility and practicability of the hydraulic floating adjustable posture institutions by the simulation of ADAMS software.First of all, the force mathematical model of the high-power and large-mining height shearer was established and the effective calculating method was determined according to the characteristics of the model. At the same time the forced characteristics and the variation law of shearer traction mechanism were analyzed; Secondly, the design of shearer hydraulic floating adjustable posture traction institutions was completed combined with the stress of the coal winning machine sliding boots. This paper gives the main structural parameters calculation method and design basis, and verified the practical applications of the structure design; In the end, established the three-dimensional entity model of the posture traction mechanism by using of UGNX modeling software and turn into simulation software ADAMS and determined walking wheel and rack mesh dynamics simulation model of hydraulic floating adjustable posture traction institutions. In addition, studied the kinematics characteristics of the traditional traction mechanism of shearer by removing spring damper of simulation model, and analyzed the simulation results of different structure forms of traction mechanism. At the same time,analyzed the impact of traction resistance change on movement characteristics of the whole system by using different frequency traction resistance simulation, and optimize the shearer motion by changing the damping coefficient of hydraulic cylinder. The results show that the shearer which using hydraulic adjustable posture traction mechanism can improve the whole shearer stress state and walking stationarity and meet the demand of the shearer attitude adjustment, which illustrates the applicability of the adjustable posture mechanism to walking system of shearer. By adjusting the hydraulic cylinder telescopic motion can realize floating point of supporting point and uniform load, and achieved to adapt bumpy floor. The structure design has played a special balance function. |
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