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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. The main function is to ensure that the door can be opened normally, or the door can be closed to the initial position accurately and timely. Normally, door closers have the function of closing the door automatically. A door closer can only close the door in one direction, while a floor spring controlled door can close the door in both directions.

The core of the door closer design idea 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. More importantly, door closers have become an indispensable part of modern building intelligent management.

Floor springs are considered hydraulic door closers, but the device used to compress the springs is a worm gear instead of a rack. The basic configuration of the floor spring is the upper axis and the down axis. The aerial axis is an accessory that connects the door frame and the door leaf at the upper part. It consists of a bolt-type shaft fixed on the door leaf and a bushing fixed on the door leaf. Floor springs are versatile and suitable for almost all wood, steel, aluminum alloy doors and frameless glass doors.