1, representing the first force, the force of closing the door at a large angle,
2. It represents the second force, and the locking force is the force when the door is closed. The left hand rotates fast, the right hand rotates slowly, and the fine adjustment changes greatly.
The door equipped with anti-theft lock can resist abnormal opening under certain conditions for a certain period of time, and has certain safety protection performance, reaching the corresponding anti-theft safety level.
The full name of the security door is "security door". Both anti-theft and safety performance. According to the General Technical Conditions for Anti-theft and Anti-theft Doors, qualified anti-theft doors cannot pry open or open the 6 15 mm opening on the door leaf within15 minutes or open the 38mm opening within the lock point 150mm semicircle.
Extended data:
Door closer is a spring-like hydraulic device on the door head. When the door is opened, it can be released after compression and the door will close automatically. It has the function of spring door, which can ensure the door to close to the initial position accurately and timely after opening.
Modern hydraulic door closers (door closers for short) began with a patent registered by Americans in the early 20th century. Different from the traditional door closer, it achieves the buffering effect by throttling the liquid in the door closer. The core of the design idea of hydraulic door closer is to control the door closing process, so that the functional indexes of the door closing process can be adjusted according to people's needs.
References:
Baidu encyclopedia-door closers