The invention provides a closed door device suitable for mine tunnels. The device comprises a door main body, an
airbag, telescopic rods and a support
cushion. The innermost side of the
airbag is connected to the frame of the door main body, the telescopic rods are arranged around the door main body, one ends of the telescopic rods are fixedly connected to the frame of the main body, the other ends are connected with the support
cushion, and the support
cushion is connected to the outermost
airbag skin of the airbag into a whole in a bonding mode. According to the device, the door main body inthe middle of a door body is of a hard structure, the edge is an
inflatable airbag, so that the door body has certain strength and stability, and good sealing performance; according to the device,
oxygen loss can be reduced and the
utilization rate of
oxygen can be improved without affecting underground ventilation; as the tunnels advance, the position of the closed door can be gradually adjustedto adapt to changes of the environment, so that a
closed space is always maintained at an appropriate size, the
oxygen concentration in a
local space can be maintained, constant
oxygen supply effectis ensured, a large amount of
underground space resources,
material resources and financial resources can be effectively saved, the maintenance is convenient, and the cost is low.