Circular vault doors are installed in the passageways connecting the underground main substation and the main drainage pump room to the shaft bottom yard, enabling rapid closure to prevent sudden water ingress. The key component is the sealing device. The “QKB Airbag-Type Rapid Closure” is a specialized rapid-sealing technology and equipment used for emergency fire-fighting operations, temporary containment of localized gas accumulation or over-limit concentrations, and control of localized high-temperature fire sources. This airbag-type rapid closure represents a domestic first (patented under patent number ZL 97 2 00747.4) and holds significant practical importance in enhancing mine disaster-resistance capabilities, reducing substantial economic losses and casualties caused by fires in mines. The product is manufactured from antistatic, flame-retardant rubber material, featuring light weight, portability, simple operation, and rapid installation.

Structure: 1. The door leaf of the airtight door is fabricated by welding together flat steel plates, grid-reinforced panels, and perimeter beams. 2. The door frame of the airtight door is a framed structure composed of channel sections and I-beams. 3. The tensioning device of the airtight door employs wedge-shaped sliding blocks. 4. The door hinges of the airtight door are supported by rolling bearings.

Key Features: 1. Simple operation that is easy for rescue personnel to master; inflation can be performed using either a high-pressure nitrogen cylinder or a manual bellows. 2. Lightweight and portable, eliminating the difficulties and time- and labor-intensive challenges associated with transporting traditional airtight sealing materials. 3. Rapid deployment—typically taking only 5–7 minutes, with a fastest turnaround of just 4 minutes—to complete temporary sealing. 4. Excellent sealing performance, with a low air-leakage rate and superior airtightness of the airbag, which can maintain integrity for more than 24 hours without leakage. 5. Wide applicability: suitable for roadways with various cross-sectional shapes and support configurations, offering versatility and adaptability to both large and small spaces. 6. Rescue personnel can conduct routine training in any underground roadway. 7. The airbag seal provides both structural support and effective sealing, eliminating the need for temporary support. 8. The airbag seal can also serve as a temporary wind door for temporary airflow regulation.