New spring hinges are already widely used, this iron chain not only played a small and better anti-theft effect, it makes it more fire doors to the tightly related. Thus been widely used in fire doors above. It's on the blade (3), on the sleeve (6), the main spring (4), the central axis (5), bearing (7), lower leaves (14) and casing (8), main spring (4) Set in the central axis (5), and embedded in its upper central axis (5) on the tank, the casing (6) through the spring pins (2) and the central axis (5) connection, under the casing (8) also equipped with auxiliary springs (11), spring seat (12), roller (9) and intermediate sleeve (10), the middle set (10) Set in the central axis (5) of the bottom, auxiliary springs (11) top with middle set (10) connection, the bottom bearing in the spring seat (12), the spring seat (12) and casing (8) of the bottom of the fixed link, the central axis (5) at the bottom and the casing (8) both there with the roller (9) be the cylindrical face of the trough, roller (9) in the central axis (5), casing (8) and the intermediate sleeve (10) surrounded interval. The utility model is not only small, and can fire doors shut tight, and reliable.
 
It appears alone in a fire door not only made a relatively good effect but also in steel doors, wooden doors are widely used, new and old customers come to test, experience this new product. 
 

Author: River supernatural power chain Co., Ltd
website: www.shenlichain.com
main product: swing chain、iron chain