The core of the door closer is to control the closing process, that is, by installing the door closer, the door can close itself smoothly, thus playing a variety of roles such as limiting the spread of fire and ventilation in the building. Under the condition that the door closer is installed normally, various functional indexes during the door closing process can be adjusted according to people's needs.
Extended data
Opening resistance of door closer and its adjustment;
Almost all door closers have two adjustable functions: closing speed and locking speed. The locking speed is adjusted according to the hardness of the lock tongue to lock the movable fan, which will not cause unnecessary impact on the door frame. However, the adjustment of the whole closing speed is not affected by the locking speed. Both of them have an influence on the opening resistance of the door closer.
2. For the external doors of buildings, opening resistance is a very important function. The door closer should not only prevent the movable fan from being excessively opened by people's large thrust activities, but also prevent the movable fan from being damaged by excessive strong wind when it is opened.
3. The door closer can accurately adjust the closing force level (i.e. closing speed and locking speed), thus reducing the opening resistance. Usually, the correct adjustment method of the door closer will be explained in detail in its installation manual. The door closing force is generally the specific performance of a certain door closer, and different door closers may have different specific operations.
References:
Baidu encyclopedia-door closers