| Ventilation shaft explosion-proof doors are important ventilation facilities in mines,which can relieve pressure and protect the main ventilator during disasters.The current traditional non-synchronous counterweight cover type explosion-proof door cannot withstand high impact loads during the emergency activation process,and does not have the ability to automatically reset and use multiple times,and there is a greater safety hazard during use.As the node equipment for the intelligent transformation of the ventilation system,it is urgent to carry out the theoretical research on the effectiveness of the resetting of the explosion-proof door and the evaluation and demonstration of the equipment improvement design.According to the national key research and development program subject "Quick reset technology and equipment for ventilation shafts",the specific indicators: the impact strength of the ventilation shaft explosion-proof door equipment is greater than 0.8MPa,has more than 3 pressure relief and reset functions,and the reset time is less than 50 s.According to the optimized design of the current explosion-proof door in Yangchangwan No.2 Well,the following work has been done:(1)Study the propagation and specific failure forms of gas explosion shock waves,use impact mechanics modeling to analyze the transient mechanical response laws of the cover under different shock loads,analyze the local stress overrun and damage characteristics of the cover,and discuss the thickness,thickness,and damage of the cover.The impact of the production materials and the rib structure on the impact resistance of the explosion-proof cover is given,and the optimized design is given and verified that the optimized design of the new explosion-proof door cover can effectively resist the impact force above 0.8MPa,and the impact resistance capacity is increased by 63.33%,which is safe to withstand The ultimate load is0.98 MPa.(2)Reveal the important influence of the non-synchronized counterweight on the explosion-proof door system through reliability analysis,use the nonlinear dynamic finite element analysis method to solve the dynamic problem of the explosion-proof cover opening under impact,and analyze and summarize the whole process of impact pressure relief.The failure reason of the torsional offset when the prototype blast door is lifted is analyzed.The design of the prototype explosion-proof door does not have the ability to reset.The greater the weight difference,the worse the stability of its opening action.(3)Propose a design scheme for a new type of synchronous counterweight explosion-proof door,study the restraint function of innovative structural components on the lifting posture through simulation,and combine the scaled aerodynamic impact test to obtain the dynamic response characteristics of the system to further verify its resistance to 0.8MPa impact strength Ability.The simulation verifies the performance index of the new explosion-proof door for quick and effective reset within 50 s,and carries out multiple whole-process simulations to verify that the new explosion-proof door has the ability of multiple effective reset.The operation and maintenance of the long-term standby explosion-proof door in the field exposure environment was studied,the equivalent friction coefficient calculation model of the explosion-proof cover was established,and the quantitative index for the maintenance period of 4months was formulated.The optimized design of the new explosion-proof door meets the actual needs of intelligent ventilation,can provide theoretical support for field applications,and has important practical significance for scientific research in the field of ventilation safety.The article has 54 pictures,10 tables,and 76 references. |
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