When a fire occurs, the fireproof brass door hinges first provide basic support for the fireproof door through their own high temperature resistance, forming a stable connection structure with the door frame. Brass material is not easy to soften and deform in high temperature environment, which can maintain the mechanical strength of door hinges and ensure that the door leaf will not loosen due to high temperature and detach from the door frame. The door frame is the fixed frame of the fireproof door. The fireproof filling material (such as rock wool and aluminum silicate wool) inside it can block heat transfer. The connection point between the door hinges and the door frame has been specially reinforced to withstand the expansion force of the door leaf at high temperature, avoid the connection part from breaking due to thermal stress, and provide a structural basis for other components to play their role.
Coordination with the door leaf is one of the core functions of fireproof door hinges. The interior of the fireproof door leaf is usually filled with fireproof and heat-insulating materials, and the installation position and number of door hinges directly affect the closing and sealing of the door leaf. When a fire occurs, the door hinges will keep the door leaf and the door frame in precise fit to prevent the gap from being too large due to deformation of the door leaf. When the temperature rises, the door leaf may expand slightly. The movable structure of the door hinges allows the door leaf to be fine-tuned within a certain range, which does not hinder its normal closing, and can limit excessive deformation through its own rigidity, ensuring that the door leaf always covers the door frame area and blocks the diffusion path of flames and smoke.
The effectiveness of the fireproof seal strip is inseparable from the assistance of door hinges. The fireproof seal strip between the door frame and the door leaf will expand at high temperatures and fill the tiny gaps, but this process requires the door leaf to maintain a stable closing pressure. The fireproof brass door hinges provide continuous closing force for the door leaf through their own elastic structure, ensuring that the seal strip is in close contact with the door leaf and door frame, and will not lose the sealing effect due to the shaking of the door leaf. At the same time, the high temperature resistance of the door hinges ensures that the closing force will not decay at high temperatures, allowing the expanded seal strip to fully play its role, forming a double barrier and slowing down the penetration rate of flames and smoke.
The synergy with the fireproof lock can enhance the overall stability of the door body. When a fire occurs, the fireproof lock will lock the door leaf to prevent it from opening accidentally, while the door hinges provide support from the other side, forming a diagonal force balance with the lock. This balanced state can prevent the door leaf from tilting due to unilateral force under high temperature, ensuring that the lock position of the lock is accurate. When people need to evacuate, the flexible rotation performance of the door hinges and the quick unlocking function of the lock allow the door leaf to open smoothly, which not only maintains the closedness in the early stage of the fire, but also does not block the escape route in an emergency, achieving the unity of safety and emergency response.
The protective effect of fireproof glass (if equipped on the door body) is also closely related to door hinges. Fireproof glass can block the spread of flames, but it requires the door leaf to remain stable to work. Door hinges control the swing amplitude of the door leaf to prevent the glass from cracking due to vibration. At the same time, its high temperature resistance will not transfer too much heat to the edge of the glass, reducing the risk of glass breaking due to local overheating. In a high temperature environment, the connection between the door hinges and the glass fixing frame remains rigid, ensuring that the glass is always in the correct position and forming a continuous fire barrier with other parts of the door leaf.
The synergy with the door closer can optimize the closing speed and strength of the door leaf. The door closer can control the speed of the door leaf's automatic closing, while the door hinges determine the rotation trajectory and stability of the door leaf. In the event of a fire, the door closer drives the door leaf to close. The precise structure of the door hinges ensures that the door leaf moves along the predetermined trajectory and will not get stuck due to deformation. At the same time, by adjusting its own friction coefficient and cooperating with the strength of the door closer, the door leaf is decelerated in the final stage of closing to avoid damage to the sealing strip or shattering of the glass caused by violent collision. This synergy allows the door leaf to close quickly and gently, taking into account both efficiency and safety.
When dealing with long-term high temperatures, the synergy between the door hinges and the overall structure of the fire door reflects the system protection advantage. As the fire continues, the various components of the door body will gradually withstand the test of high temperature. The brass material of the door hinges maintains its own strength while having a low thermal conductivity coefficient, which can reduce the transfer of heat to the door frame and wall and slow down the heating rate of the surrounding structure. At the same time, the connection between door hinges and door leaves and door frames is filled with fire-resistant sealant. The colloid can be further solidified at high temperature to enhance the sealing of the connection, and together with other components, it forms a lasting fire prevention line, buying more time for personnel evacuation and fire fighting and rescue.
