Modern hydraulic door closers (referred to as door closers) began with a patent registered by the United States in the early 20th century.

The working principle of the door closer is when the door is opened, the door body drives the connecting rod to move, making the transmission gear rotate, and drives the rack plunger to move to the right. During the right movement of the plunger, the spring is compressed, and the hydraulic oil in the right chamber is also compressed.

The core of the design idea of the hydraulic door closer is to realize the control of the door closing process, so that various functional indicators of the door closing process can be adjusted according to people's 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).

Door control hardware is a very important supporting product device in people's daily life. It mainly includes: floor springs and door closers, usually used in shopping malls, office buildings, residential areas, hotels and other public places.

Although a door closer can automatically close the door for us, it is not easy to properly install and adjust a closer! If the installed door closer closes the door too hard, it will generate noise and affect our normal life; if the door closer is closed too fast, the elderly and children will be in danger when using it. Therefore, we need to make relevant adjustments to the door closer.