This is a fireproof door lock , a safety device in the field of building fire protection. Its core function is to ensure the safe evacuation of personnel in emergency situations such as fire, while preventing the spread of fire and smoke.

1. Product structure and core components

Key components can be identified from the appearance:

• Lock body : The main structure made of metal, responsible for carrying core components such as the lock tongue and lock cylinder, ensuring the overall strength and fire resistance of the lock.

• Lock core : Usually made of high-temperature resistant materials such as pure copper to prevent it from melting and failing due to high temperatures in a fire. It is the key to the lock's anti-theft and fire-proof performance.

• Handle : It adopts a double-bend structure design made of stainless steel, with no sharp corners to reduce the risk of collision. The one-piece molding process ensures its durability and is not easily deformed at high temperatures, which buys time for fire rescue.

2. Functions and Application Scenarios

1. Emergency escape function :
   In the event of a fire, people inside can quickly open the door by pushing the handle without a key, while people outside need authorization to open the door, realizing the safety logic of "free opening inside and restricted opening outside".

2. Fire barrier function :
   The lock's fire resistance limit can reach 960°C and last for more than 72 minutes. It works in conjunction with the fire door to block the spread of fire and smoke, buying time for people to evacuate.

3. Anti-theft and security linkage :
   It can be used for daily anti-theft and trigger an alarm in case of fire (such as voice prompt "emergency exit"). It can also be linked with access control, smoke detectors and other systems to trigger an alarm when the door is opened illegally.

4. Application scenarios :
   It is widely used in fire doors, emergency exit doors, safety passage doors, etc. in crowded places such as shopping malls, hospitals, office buildings, factories, etc., meeting the requirements of building fire regulations for "emergency evacuation passage devices".