The function of the door closer is to automatically close the door after opening it; Therefore, automatic door closing cannot be adjusted.
The door closer is a spring-like hydraulic device on the door head. When the door is opened, it can be released after being compressed, and the door will be closed automatically. It acts like a spring door, which can ensure that the door will be closed to the initial position accurately and timely after being opened.
Modern hydraulic door closers began with a patent registered by Americans in the early 2th century. It is different from traditional door closers in that it achieves buffering effect by throttling the liquid in the door closers. The core of the design idea of hydraulic door closer is to control the door closing process.
Extended information:
Introduction to the use of the door closer:
1. Damping and buffering function: damping and buffering can be generated after the door is quickly opened to a certain position, and the damping and buffering strength and range can be adjusted according to the use requirements; This function is used to prevent the door or lock from colliding with the wall when opening the door quickly, or to prevent people from leaning forward and falling to the ground when opening the door quickly due to weightlessness during emergency escape.
2. Delayed slow door closing: the door closes slowly at a constant speed from the maximum position of opening the door, and can be adjusted steplessly as required. Suitable for frequent and crowded places, especially hospitals, with doors and passages for the elderly, children and the disabled.
3. Safe and quick super damping closing performance: sudden application of external force during closing at any angle should enable safe and quick closing.
4. Operating environment: fire prevention requirements and anti-freezing requirements for places below minus 35 in winter.
Baidu encyclopedia-electric door closer
Baidu encyclopedia-door closer