Research On The Analysis And Control Technology Of The Mechanical Characteristics Of Mineral Ventilation Structure

With the deep development of coal mining,underground ventilation system has taken on more arduous tasks.Most of the underground disaster accidents are closely related to the ventilation system,and most of the cases are caused by the failure to discharge poisonous and harmful gases and dust in time,and the failure to timely deliver fresh air flow.The underground ventilation system mainly measures the wind speed on the spot and adjusts the wind speed manually.There is a lag phenomenon and the adjustment accuracy is not high.Therefore,the construction of the perception system of the underground monitoring environment needs to be further strengthened.The on-demand regulation and environmental perception of underground ventilation system is particularly important,which not only reduces labor cost,but also makes the regulation more accurate and timely,which puts forward a solution for efficient mining and high safety production of coal mine.In this paper,the mechanical characteristics and control technology of mine ventilation structures are analyzed and studied.The main research contents are as follows:The structural parameters of the ventilation structure in the ventilation system of the tunnel,namely the damper and the wind window,are calculated theoretically,and the optimal structural parameters are obtained when the maximum pressure Angle is 50°.The physical structure design is carried out based on these parameters.The dynamics model of the damper transmission component is established.In order to obtain the load required for dynamic analysis,the mechanical and hydraulic simulation of the damper system is carried out first.The impact instantaneous load of four key positions during the throttle operation is taken as the input load of the transient dynamics,and 12 working conditions A1-A4,B1-B4,C1-C4 are analyzed.The mechanical properties under various working conditions are obtained.The flow field characteristics of the louver regulated wind window were analyzed,and the flow field of the wind window under different louver angles,different louver number and different inlet wind speed was simulated by Fluent respectively.The wind speed law on the central axis of the roadway and the vertical line with the central axis of the roadway is obtained when the swing angle of the louvers is 30°～90° and the inlet wind speed is 1m/s～6m/s.Topology optimization was carried out on the connecting rod and the straight arm of the key parts of the damper,and the connecting rod optimization model with 18.84% weight reduction and the straight arm optimization model with 16.99% weight reduction were obtained.The maximum stress of the optimized connecting rod model was reduced by 2.44%,and that of the straight arm optimization model was reduced by 6.56%.The mechanical system and control system of the tunnel ventilation system were analyzed,and the control logic of the entire tunnel ventilation system was designed in multiple scenarios to ensure the timely response of the damper and wind window under the control of the control system,so as to achieve the goal of on-demand regulation of the tunnel air volume.There are 106 figures,25 tables and 113 references in this paper.