Anti-backflow device for belt conveyor passing through air door

The mine conveyor anti-backflow device for air doors is a specialized accessory designed for conveyor belts passing through air door areas. It ensures the normal operation of the conveyor while maintaining the sealing performance of the air door, preventing abnormal airflow between different pressure zones, and adapting to the complex underground production and ventilation environment.

Core Structural Components

1. Sealing Chamber Assembly

• The main body is a frame-type sealing chamber, fixedly connected to the air door frame or tunnel wall, forming an enclosed space around the conveyor. The chamber is typically made of high-strength steel plates or wear-resistant composite materials, offering impact resistance and corrosion resistance to suit the dusty and vibrating underground environment.
• Flexible sealing elements (such as wear-resistant rubber strips or canvas curtains) are installed on the inner side of the chamber, tightly fitting the conveyor surface to minimize gaps and block airflow through crevices.

2. Follow-Up Sealing Mechanism

• To address vertical vibrations or deviations during conveyor operation, follow-up sealing components (such as spring-compressed sealing plates or rolling sealing wheels) are employed. These ensure continuous contact with the conveyor surface through elastic structures or rolling contact, preventing seal failure due to belt movement.
• Some models are equipped with guide wheels or limit devices to assist the sealing elements in stably following the conveyor motion, reducing friction and wear.

3. Interlocking Opening and Closing Assembly

• Synchronized with the air door’s opening and closing mechanism, the sealing device adjusts the chamber’s open/closed state via linkages or pneumatic/electric actuators when the air door operates. This ensures effective sealing during conveyor passage and avoids structural interference during air door movement.
• The interlocking assembly includes buffering functionality to prevent rigid collisions between the air door and sealing device, protecting the equipment structure.

4. Wear-Resistant Protective Components

• Areas of the sealing elements in contact with the conveyor use high-wear-resistant materials (such as polyurethane or wear-resistant alloys) to minimize long-term friction losses. Protective liners are added to easily worn areas inside the chamber to extend the equipment’s service life.