The door closer is a hydraulic device similar to a spring on the door head. When the door is opened, it can be released after compression to automatically close the door. It acts like a spring door and can ensure that the door is closed to its initial position accurately and timely after being opened.Modern hydraulic door closers (referred to as door closers) began as a patent registered by Americans in the early 20th century. It is different from the traditional door closers, and it achieves buffering effect by throttling the liquid in the door closers.The core of the design idea of the hydraulic door closer is to realize the control of the closing process, so that various functional indicators of the closing process can be adjusted according to human needs.The significance of the door closer is not only to automatically close the door, but also to protect the door frame and door body (smooth closing). More importantly, the door closer has become an important part of the intelligent management of modern buildings.Door closers are mainly used in commercial and public buildings, but they are also used at home.They have many uses, the most important of which is to make the door close by itself to limit the spread of fire and ventilation in the building.
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