| Mine anti-wind is one of the important tasks of mine ventilation safety.When there is a sudden underground fire,the airflow in the underground roadway can be effectively controlled by anti-wind which can provide fresh airflow and protect the evacuation of underground staff.In order to reduce the tightening time of the explosion-proof manhole cover during the mine counterwind,improve the efficiency and promote the automation of the mine counterwind,the thesis takes the explosion-proof cover electro-hydraulic fast tightening device of the mine main fan as the research object,and the working characteristics of the hydraulic system and the strength of the mechanical structure when bearing the load are simulated.The main research contents are as follows:1.Complete the principle analysis,mechanical structure design,and threedimensional modeling of the electro-hydraulic fast fastening system.The load on the MFBL explosion-proof cover of the main fan in the vertical shaft of a coal mine is analyzed theoretically.On this basis,the working principle of the electrohydraulic fast cover device of the explosion-proof cover is analyzed,and the structural design and description of each part of the electro-hydraulic fast fastening system are completed.The 3D modeling of the overall mechanical structure of the electro-hydraulic fast fastening system is carried out by Solidworks software.2.The simulation model of the key components and the whole hydraulic system are established through the mathematical model,and the entire working process of the hydraulic system is simulated and analyzed.It can be seen from the simulation results that the electro-hydraulic fast fastening hydraulic system can meet the technical requirements and can realize the fast fastening of the explosionproof cover.At the same time,considering the dynamic volume elastic modulus of oil in the hydraulic system,and the influence of oil dynamic compression on the hydraulic system of the electro-hydraulic fastening system is analyzed.The simulation results show that the dynamic compressibility of oil leads to the response time of the hydraulic system to slow down and the flow shock will increase at the same time.Therefore,reducing the initial gas content in the oil can improve the volume elastic modulus of the oil-containing gas,enhance the compression resistance of the oil,reduce the impact,and speed up the response speed of the hydraulic system.3.Finally,the finite element analysis of the structure of the electro-hydraulic fast fastening device is carried out.With the help of finite element statics and dynamics,the mechanical stimulation of the mechanical structure of the electrohydraulic fast fastening system is carried out.The stress,strain,and overall deformation of the electro-hydraulic fast fastening device under quasi-static conditions under different loads are analyzed.The structural dynamics analysis of the device is carried out by dynamic analysis.The analysis results show that the mechanical structure of the electro-hydraulic fast fastening system meets the strength requirements in the process of static loading and movement.In summary,the response time of the hydraulic system and the compressive force provided meet the working requirements;the mechanical structure of the tightening device has sufficient structural strength while pressing the explosionproof manhole cover within the rated load;reducing the gas content in the oil can enhance the compressibility of the oil,reduce the response time of the hydraulic system,reduce the flow punch when unloading during the reset stage of the hydraulic system,and provide a theoretical basis for the design of the electrohydraulic rapid tightening device. |
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