At present, automatic door closers are divided into hydraulic type and spring type, and most of them are hydraulic door top springs and single-tube spring hinges with one-way opening.
It should be noted that this automatic door closer should not be installed on the fire side by mistake to avoid being damaged by high temperature in case of fire.
At ordinary times, it is necessary to ensure that the automatic door closer is sensitive and effective, and it should be replaced in time once it is damaged.
2. Normally open fire doors must be equipped with fixing devices to facilitate access.
Generally, there is an electromagnetic release switch or fusible alloy to fix the door on two walls. In case of fire, the door will automatically close under the action of spring if it loses magnetism due to power failure (or the lock tongue will be sucked open due to power supply) or molten alloy.
It is worth noting that fire doors cannot be fixed with hooks or door clips, because in case of fire, panicked people will not close the door, which will lead to the intrusion of fireworks, thus making the walkways and stairwells lose their safe evacuation function.
3. The stairwell fire doors designed for evacuation are often locked in use to achieve the purpose of theft prevention.
In order to solve the problem of both fire prevention and theft prevention, this kind of fire door can adopt electromagnetic door lock.
People in this building can open the door with a key. In case of fire, the circuit is connected through smoke sensor linkage or remote control in the fire control room, and the lock tongue retracts under the action of magnetic force, thus pushing the door open.
You can also set up a simple mechanical push-rod door lock, which can be opened at any time by pushing the door from the inside. When people go out, the back door will rebound and close, and when they go in from the outside, they will open it with a key, thus preventing the perpetrator from entering the building.
4. Some double fire doors have sealed bite. If they are closed in the reverse order, they cannot be locked. Therefore, it is necessary to set up a sequencer to control the steps before and after the door leaves are closed.
5. If the door handle of the fire door must be turned by hand to open it, it may be burnt in case of fire.
Therefore, it is recommended to use push-rod door lock, and only by pushing or squeezing the car body can the fire door be opened.
6. Prevent carpet or indoor furnishings from blocking the fire door, and ensure normal use in case of fire.