Explosion protection door and cover would be damaged if gas and dust exploded in coal mine underground , which caused air escape branch from main draught fan, ventilation system underground air chaos and invalid, poison gas diffusion, mash gas accumulation and caused secondary explosion. In order to reduce the loss and disaster consequence, maintain continuous regular ventilation underground after the disasters to improve the condition for survive and save, an auto-sealing device was designed. It could seal the coal mine ventilation shaft instead of explosion protection door and cover automatic and timely. When the sensor, which was set below the explosion-proof covers, sense the non-normal work state of the explosion-proof covers, it will produce the trigger signal, which will trigger the circuit control system and let it start the inflatable power equipment. The folded body of the sealing airbag will pop-up storage cavern under the control of inflated power. It will roll and expand along the support structure, fill the entire wellbore cross-section soon through the effect of the inflatable inflation and negative pressure which is created by main fan ventilation.%煤矿井底发生煤尘瓦斯爆炸事故时产生的冲击波会冲开风井防爆门、盖,引起主风机风流短路,井底风流紊乱、通风系统瘫痪,导致毒害气体扩散、瓦斯积聚,引发二次爆炸.为了减少因此造成的损失,研发了一种在防爆门、盖被摧毁后能自动封堵的装置,通过感应防爆门盖的损毁信号控制充气动力设备对气囊折叠体进行充气,折叠体被充气弹出储藏硐室,沿支撑架构延展、膨胀并充满井筒横截面,实施对风井的密封,以维持灾后井底持续通风,降低灾害后果,为井底幸存人员的生存与自救提供有利条件.
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