| High-pressure water jet machine(HPWJM)is an apparatus designed for slotting and drilling in low permeability coal seam applying the technology of high-pressure water.It is noted by experiment and practice that the presence of this technology has a great improvement on the emission efficiency of gas,which has significant influence on the safety and efficiency in mining process.The idea of mechanic-electronic-hydraulic integration has been thoroughly coordinated during the design process for the aim of supreme working performance of each system of the device.The machine mainly includes 4 systems: the binding system,the constraint system,the direction-reversing system and the moving system.Electronic control system mainly focuses on the control of leveling system for the hydraulic outrigger.Hydraulic technique is mostly applied in the clamping system,the thrust system and the supporting system.Each part of the equipment directly affects on the performance of the machine.Due to the mega pressure and velocity of the liquid,the flow affects the SSP(seamless steel pipe)during drilling and slotting in the coal seam,and furtherly changes the durability and performance of the supporting system.Taking the hydraulic supporting system of the HPWJM as the study object,the following researches have been subsequently carried out: The finite element analysis of the SSP of the binding system.The simulation of leveling,process of the hydraulic outrigger,and the operation process of hydraulic supporting system.This thesis includes the following main research focuses.A brief introduction for the current development status of the coal industry,as well as the hydraulic technique and the vibration of the tubes were successively made.And the meaning of this research was summarized.Then the research methods were settled down.Finite element analysis for the binding system of the HPWJM.A general introduction for the theory of finite element was firstly made.Three types of models under natural and FSI conditions of the SSP binding system were separately created and the modal analysis was done based on that.Then,the related conclusions were drew out by analyzing the results.The analysis for the leg leveling process of the hydraulic supporting system.The theory of four-point leveling of hydraulic legs was presented.Simulation models under 2 different working statuses of the hydraulic supporting mechanism were established.Specifically speaking,every 2 of the 4 hydraulic legs were set to the same horizontal level and the other condition,on the contrary,were separately set to 4 different levels.The simulation analysis was carried out under the two modes and the key factors related to the adjustment of the level were put forth.The simulation analysis of operating conditions of the hydraulic supporting system.Based on the theory of hydraulic supporting system and the real working condition of the external incentive signal,the hydraulic supporting system was simplified into a hydraulic outrigger system model.Next,two kinds of simulation models were built based on whether a vibration of the SSP binding system came or not,and a working process of simulation for the hydraulic supporting system was carried out. |
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