Closed fireproof door

The utility model discloses a closed fireproof door which comprises a door frame, a door leaf, a door closer and a timing opening device. The timing opening devices are arranged on the door frame and the door leaf, the door leaf is opened by holding the rotating grip, then the rotating grip is rotated to start the time control switch, the stepping motor controls the spring lock to be opened, the spring bolt of the spring lock pops out downwards and is inserted into the inner side of the lock groove, and therefore the door leaf is positioned in the opening state. And after the timing duration is reached, the stepping motor controls the spring lock to be closed, the door leaf can be unlocked, at the moment, the door leaf can be automatically closed under the acting force of the door closer, and the effect of isolating a fire source and dense smoke is achieved. 本实用新型公开了一种封闭式防火门，包括门框、门扇、闭门器和定时开启装置。本实用新型通过在门框和门扇上设置了定时开启装置，通过握住旋转握把将门扇打开，随后转动旋转握把启动时控开关，使步进电机控制弹簧锁开启，使弹簧锁的锁舌向下弹出并插合进锁槽内侧，从而将门扇定位在开启状态，方便人群快速通行，使其高效的撤离现场