Common fire doors include fire doors. In fact, there are many types of fire doors, such as wooden fire doors, steel fire doors, steel wood fire doors, other fire doors, etc. In China, fire doors are divided into three levels: Class A fire doors must be fire-resistant for 1.2 hours. They are mostly double-sided thin steel plates filled with calcium silicate board and ceramic wool, which are mainly used in the door openings of fire protection zones. Class B fire doors must be fire-resistant for 0.9 hours. They are constructed of thick wooden planks with single or double-sided nailed asbestos boards and iron sheets. Office. Class C fire doors shall be fire resistant for 0.6 hours, and are mainly used as inspection doors for pipeline wells.

  The following points should be noted in the installation, use and maintenance management of fire doors:

  1. Since it is impossible for people to close the door when a fire occurs, the fire door must be automatically closed and an automatic door closer must be installed. At present, automatic door closers are divided into two types: hydraulic type and spring type. Most of them are used for fire doors, which are one-way open hydraulic door top springs and single tube spring hinges. It should be noted that do not mistakenly install this type of automatic door closer on the side of the fire surface, so as not to be damaged by high temperature in the event of a fire. Always make the automatic door closer sensitive, and replace it in time if it is damaged.

  2. Fire doors that are normally open are provided with fixing devices to facilitate passage. Generally equipped with electromagnetic release switch or fusible alloy to fix the door on both sides of the wall. In the event of fire, power is lost and demagnetized (or the magnet is energized to suck the lock tongue) or the alloy is burned, and the door is automatically closed under the action of the spring. It is worth noting that the fire door cannot be fixed with a hook or a door card, because people in panic will not close the door in the event of a fire, which will cause fireworks to enter, thereby losing the safety evacuation effect of the walkway and stairwell .

  ３. Fire doors designed for evacuation of stairwells are usually locked in use to prevent theft. In order to solve the problem of both fire prevention and anti-theft, this type of fire door can use electromagnetic door lock. The personnel in this building can use a key to open and enter. In the event of a fire, the smoke detector is linked or the remote control of the fire control room is connected to the circuit. The lock tongue is retracted under the action of the magnetic force, and the door can be pushed open. A simple mechanical push bar door lock can also be set, which can be opened as soon as the door is pushed from the inside, and the door will rebound and close when people go out. The door must be opened when entering from the outside, so the perpetrator can be prevented from entering the building.

  4. Some double-leaf fire doors have bite openings for airtightness. If the order is reversed when closing, it cannot be closed tightly, so a sequencer must be installed to control the steps before and after the door is closed.

  5. If the door handle of the fire door needs to be turned by hand to open, it may not be able to open the door due to its being burnt during a fire. For this purpose, the push-rod door lock is suitable, and the fire door can be opened only by hand pushing or body squeezing.

  6. It is necessary to prevent the carpet or indoor furnishings from getting stuck in the fire door, so that it can be used normally in the event of a fire.