The utility model relates to an assisting retractor device of an electric retractable door, belonging to the field of electric retractable equipment.
本实用新型涉及一种电动伸缩门助伸缩装置，属于电动伸缩装置领域。
The utility model discloses an air flow control device of a coal mine lane ventilation system, in particular relates to a mine retractable air flow control air door.
本实用新型公开一种煤矿巷道通风系统的风流控制装置，尤其是一种矿山可缩式风流控制风门。
The retractable air door has no deformation when the downhole pressure of a coal mine changes.
它是一种在煤矿井下压力出现变化时不变形的可缩性风门。
The retractable air door has no deformation when the downhole pressure of a coal mine changes.
它是一种在煤矿井下压力出现变化时不变形的可缩性风门。
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