I. Product Overview

Protective doors are core equipment that combine safety protection with spatial isolation, effectively resisting external impacts and preventing the ingress of hazardous substances while meeting passage and environmental control requirements in specific applications. Manufactured using high-strength materials and precision engineering, these doors are custom-designed to meet varying levels of protection, offering high reliability, strong adaptability, and a long service life. They are widely suitable for a variety of facilities with stringent safety and protection requirements.

II. Uses

1. Industrial Safety Applications: Suitable for isolating hazardous areas in factory workshops—such as machining zones and chemical storage areas—as well as for protecting underground mine passageways. These solutions can withstand external impacts from accidental equipment collisions and falling ore, preventing unauthorized entry into dangerous zones while also containing the spread of dust and debris, thereby safeguarding production safety and worker health. In the power industry, they can be deployed in substations and distribution rooms to provide fire protection and prevent small animals from entering, thus avoiding equipment short-circuit failures.

2. Public Safety: In high-traffic areas such as shopping malls, hospitals, and schools, these systems are installed at fire escape routes and emergency exits, providing fire-resistant, anti-theft, and smoke-control functions. In the event of a fire or other emergencies, they effectively prevent the spread of flames and toxic smoke, buying valuable time for safe evacuation. In critical security zones such as bank vaults and museum artifact storage rooms, they can withstand violent sabotage and, when integrated with intelligent security systems, deliver dual-layer protection.

3. Specialized Protective Applications: In laboratories—such as biosafety and chemical labs—these systems can prevent the leakage of hazardous gases and microorganisms, maintaining a negative-pressure environment indoors. In high-risk areas like nuclear facilities and military-industrial sites, they can provide specialized protection against radiation and blast impacts as required, thereby ensuring environmental safety and the stable operation of equipment.

III. Technical Specifications

1. Reference dimensions: Customized products (specific dimensions shall be determined based on actual measurements) shall comply with the current standard GJB2805B-2021.

2. The door shall be of reinforced concrete construction, with a curved, arc-shaped exterior and a double-leaf design; it shall be installed as an outward-opening door. The leaf thickness shall be ≥200 mm, and the frame shall be fabricated by welding together steel plates with a thickness of ≥10 mm. The outer panel shall have a thickness of ≥4 mm, with a grid reinforcement pattern of φ≥14 mm. The core shall be filled with C30 concrete, and the door shall fit tightly against the floor, with gaps no greater than 20 mm. Each door leaf shall be equipped with ≥2 hinges. Both the frame and the door leaves must undergo rust-proof treatment, including at least two coats of anti-rust primer, with a final finish in medium gray.

3. One of the doors shall be equipped with a fixed latch on the interior side and shall comply with the following technical requirements:

① The door latch shall be of steel construction with a cross-sectional area of ≥490 mm²;

② The latch shall provide secure retention at both the top and bottom of the door, with an effective projection length of ≥30 mm;

③ The bolt shall be operated only from inside the door;

4. Lock Configuration:

① Install a dual-person, mutual-control concealed beam lock with a security rating of Class C;

② Dismantling and relocation of the existing electro-hydraulic interlock device (can be inspected during the on-site survey);

5. The portal protective doors shall be opened and closed using an electric interlock mechanism, while the protective doors inside the adit shall be opened and closed manually.

6. Achieve interoperable protection through integration with the upgraded security and lightning protection systems, ensuring compatibility and stability.

IV. Manufacturing Standards

General manufacturing standards: Strict compliance with GJB 2805B-2021 “Technical Requirements for Anti-Theft Protection in Ordnance Warehouses,” combined with application-specific standards, such as fire-rated doors conforming to GB 12955-2008, anti-theft security doors conforming to GB 17565-2007, and radiation-shielding doors conforming to GBZ/T 250-2014 “Code for Radiation Shielding Design of Radiotherapy Treatment Rooms.”

Quality Control Process: Raw material procurement requires submission of material certificates and test reports; critical materials, such as steel plates and lead sheets, must be inspected and certified as compliant by a third-party testing agency. During production, key processes—including door frame welding, door leaf assembly, and lock installation—are designated as quality control checkpoints, with 100% self-inspection conducted upon completion of each step. Finished products must undergo comprehensive inspections, including visual inspection and dimensional verification, and may only leave the factory if they pass all tests.

V. Installation and Maintenance

1. Installation requirements:

Prior to installation, the opening dimensions and surface flatness must be inspected to ensure that the vertical deviation does not exceed 5 mm and the horizontal deviation does not exceed 3 mm. If the opening fails to meet these requirements, it must be properly repaired first.

During door frame installation, expansion bolts shall be used to secure the frame to the wall, with bolt spacing not exceeding 600 mm and a minimum of three fixing points on each side. After installation, the vertical and horizontal alignment of the door frame must be adjusted to ensure smooth operation of the door leaf.

During door leaf installation, the hinge positions must be adjusted to ensure uniform gaps between the door leaf and the door frame, precise alignment of the latch bolt with the strike plate, and no looseness or abnormal noises when the door is closed. For electrically operated security doors, a dedicated power supply must be connected, and the motor speed, limit switch positions, and interlock functions must be properly commissioned to verify that all functions operate as intended.

2. Maintenance and Servicing:

Routine Maintenance: Clean the door surface weekly with a dry cloth to remove dust, and avoid using corrosive cleaning agents; inspect the weatherstripping monthly for signs of aging or damage, and replace it promptly if any issues are found; and inspect moving components such as hinges and locks quarterly, applying lubricant (such as graphite grease) to ensure smooth operation.

Regular Maintenance: Conduct semi-annual inspections of the electric protective door’s motor, control system, and wiring to verify proper motor operation, check for aging or damage to the wiring, and test the emergency escape function. Annually perform a comprehensive inspection of the door structure to identify any cracks at weld joints or rust on the steel plates, and touch up any areas where the coating has been damaged.

VI. Precautions

1. Environmental restrictions: Avoid using standard protective doors in highly corrosive environments with strong acids or strong alkalis; in such applications, a dedicated corrosion-resistant model must be selected.

2. Operating Procedures: When manually opening the protective door, operate slowly to avoid forceful pushing or pulling that could cause the door to collide with other objects or damage the locking mechanism. During operation of the electric protective door, it is strictly prohibited to stand beneath the door or obstruct its movement to prevent entrapment injuries or damage to the door itself. In an emergency, after using the emergency escape device, promptly contact qualified personnel to reset the system and ensure the door resumes its normal protective function.

3. Safety Warnings: Prominently affixed safety signage shall be displayed on protective doors, clearly indicating the protection level, opening method, and relevant precautions. For protective doors in children’s activity areas, anti-pinch devices must be installed (e.g., soft protective strips along the door edges), and children must be educated not to climb on or strike the doors at will. Regular operational training shall be provided to users to ensure they master the correct procedures for opening and closing the doors as well as emergency response protocols.