The CFMK Special Protective Door is a type of door designed for the protection of caverns. Below is a detailed introduction:

Structural Composition

• Door Leaf: The main component, typically made of high-strength steel, offering excellent impact resistance to withstand certain explosion shockwaves and debris.

• Sliding Track and Mechanism: Installed on the upper and lower sides of the cavern, allowing the door leaf to slide smoothly within the track for easy opening and closing. The track and sliding mechanism require high-precision machining and assembly to ensure smooth, uninterrupted operation without jamming.

• Sealing Layer: A sealing layer, usually made of rubber, is placed on the adjacent sides of the door leaves to provide an effective seal when closed, preventing the infiltration of air, water, and other external substances, thereby maintaining a stable environment inside the cavern.

• Resistance Unit: Includes a rotating part, a fixed part, and a resistance plate. The rotating and fixed parts are positioned on opposite sides of the cavern and secured within. The left side of the resistance plate is fixed to the rotating rod of the rotating part, allowing it to pivot within the first U-shaped bracket. The right side can be secured to the second U-shaped bracket of the fixed part using fasteners. The resistance plate presses against the inner side of the door leaf, enhancing its overall resistance.

• Drive Unit: Consists of a linear motor and an uninterruptible power supply (UPS). The linear motor, fixed inside the cavern, drives the door leaves to move closer or farther apart, enabling the opening and closing of the cavern. It operates smoothly, with low noise and high driving force, ensuring quick and precise operation under various conditions. The UPS, connected to the linear motor, provides power support during emergencies such as power outages, ensuring the protective door functions normally.

Material Characteristics

• Utilizes a honeycomb panel structure with regular hexagonal cells. The honeycomb panels are made of steel, which not only reduces the weight of the door leaf but also enhances its strength. The網(wǎng)狀 structure of the honeycomb panel distributes pressure evenly.

• The first and second buffer energy-absorbing layers are made of materials such as polystyrene board, foam rubber board, or foam aluminum board. These materials have high impact absorption capacity, enabling the protective door to resist shocks, effectively absorb and dissipate external energy like explosion shockwaves, and ensure the safety of the cavern interior.

Functional Advantages

• Excellent Protective Performance: Capable of effectively resisting attacks from conventional weapons, with blast resistance meeting certain protection levels. It also provides protection against nuclear, chemical, and biological weapons, preventing toxic agents, radioactive materials, etc., from entering the cavern, offering comprehensive protection for personnel and物資 inside.

• Reliable Sealing Performance: Reliable sealing devices are installed between the door leaf and the frame, as well as between the door leaves, effectively preventing the infiltration of external air, water, dust, and other substances. This ensures a stable environment and air quality inside the cavern, facilitating long-term storage of物資 or equipment.

• Efficient Opening and Closing Function: Driven by a linear motor, the door leaf slides smoothly within the track, enabling quick opening and closing. In emergencies, the cavern door can be rapidly opened or closed to ensure the safe evacuation or protection of personnel and物資. Additionally, the operation is simple and can be automated via an electrical control system, improving efficiency.

• Strong Impact Resistance: In addition to the robust structure of the door leaf, the resistance and energy-absorbing units provide energy absorption and resistance to the upper, lower, and middle parts of the door leaf, further enhancing its overall resistance. This allows it to withstand significant impact forces and adapt to various complex wartime environments and usage requirements.