The composition and important performance of firefighter rescue helmets

The composition and important performance of firefighter rescue helmets are crucial to ensure the safety of firefighters in complex environments. The following is a detailed description of its composition and important performance:

I. Composition

The firefighter rescue helmet is mainly composed of the following key components:

Hood: The hat shell is the main structural part of the helmet and needs to have sufficient strength to directly block the impact object. It is usually made of engineering plastic injection molding and can withstand a certain impact force and pressure.

Wearing device: The wearing device consists of a buffer layer, a hat support, a hat ring and a hat hoop. This system can form an energy absorption system in the space between the head and the top of the hat, and play a role in buffering, dispersing and absorbing external impacts to reduce the peak impact acceleration, thereby protecting the firefighter's head safety.

Mask: The mask is a facial protective mask used to protect the firefighter's face from radiant heat and splashes. It can be installed in the hat shell and can be retracted or turned outside the hat shell so that the firefighter can adjust it as needed.

Shawl: The shawl is installed at the lower edge of the fire helmet to protect the firefighter's neck and ears from water and other liquids or radiant heat. This design further enhances the protective performance of the helmet.

Chin strap: The chin strap is composed of webbing and buckles, which is used to firmly wear the fire helmet on the firefighter's head, and can be adjusted according to the individual's head circumference to ensure the close fit and stability of the helmet.

2. Important performance

The important performance of the firefighter rescue helmet mainly includes the following aspects:

Impact resistance: The helmet should have good impact resistance to resist impacts from different directions. In the impact absorption performance test, the maximum impact force received by the head mold should not be greater than a certain value (such as 3780N), and the helmet shell, hat support and other parts should not be damaged or broken.

Flame resistance: The material of the helmet should have a certain flame resistance to prevent rapid combustion in high temperature environments such as fire. In the flame resistance test, after the fire source leaves the helmet shell, the helmet shell flame should extinguish itself in a short time, and there should be no signs of the flame burning through the inside of the helmet shell.

Flame resistant performance: The chin strap, shawl and other parts should also have good flame resistant properties to prevent rapid combustion in a fire and endanger the safety of firefighters.

Penetration resistance: The helmet should have a certain degree of penetration resistance to prevent sharp objects from penetrating the helmet and injuring the firefighter's head. In the penetration resistance test, sharp objects such as steel cones should not be able to touch the head mold.

Heat resistance: The helmet should maintain stable performance in a high temperature environment without deformation, cracking, etc. In the heat resistance test, the helmet should meet certain performance requirements after being placed in a specific high temperature environment for a period of time.

Drop performance: The helmet should maintain good integrity during the fall process, without obvious defects, cracking, deformation, etc. This performance helps to ensure that the helmet can still provide effective protection for firefighters in the event of an accidental fall.

In summary, the composition and important performance of firefighter rescue helmets are crucial to ensuring the safety of firefighters in complex environments. Firefighters should ensure the integrity and stability of each component when wearing a helmet, and regularly check and maintain the performance of the helmet to ensure that it is always in good working condition.