Mining corrugated iron air door

coalMining corrugated iron air doorThe key points for use and installation are as follows：

1coalMining corrugated iron air doorKey points of use

1. Automatic control and interlocking mechanism

• Automatic opening and closingThrough a servo system or pneumatic device, the air door can automatically open and close according to the ventilation needs of the mine, without the need for manual operation. For example, the pneumatic balance adjustable damper controls the extension and retraction of the cylinder piston rod through an electromagnetic valve, driving the door leaf to rotate and achieve automated operation.

• Chain collaborationThe air door is equipped with a interlocking device to ensure that two air doors in the same tunnel will not open at the same time, preventing air flow short circuits. Some devices also support linkage with other ventilation equipment (such as gas monitoring systems), when the gas concentration exceeds Automatically shut down and sound an alarm.

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2. Sealing and impact resistance performance

• sealing designSealing strips or sealant are used between the door leaf and door frame to effectively prevent air flow leakage and dust accumulation. For example, when the pneumatic damper is closed, the sealing strip can be compressed to the design thickness to ensure the sealing effect.

• impact-resistant structureThe corrugated iron plate design enhances the impact resistance of the air door, which can withstand sudden impacts or vibrations in the mine and protect the equipment from damage.

3. Adapt to complex environments

• corrosion resistanceThe surface of the door is usually treated with spray coating or galvanizing to adapt to harsh environments such as high gas and acidic mine water, and extend its service life.

• adjustment functionSome air doors are equipped with pressure balancing mechanisms or adjustable sealing strips, which can dynamically adjust the sealing performance according to changes in mine air pressure to ensure ventilation efficiency.

2、 Installation points

1. Basic preparation

• Location SelectionThe air damper should be installed in a stable surrounding rock, with a normal cross-section and not easily damaged, avoiding areas where personnel and vehicles frequently pass, in order to reduce the impact of frequent opening and closing on the stability of the mining airflow.

• Cutting and foundation treatmentIn coal tunnels, the excavation depth around the door walls should not be less than 0.3 meters; In rock tunnels, the depth of excavation should not be less than 0.2 meters. The gap between the door frame and the two sides of the roadway, as well as the roof, needs to be filled with concrete or sealed steel plates to ensure structural stability.

2. Door frame installation

• tilt angleThe door frame should be tilted towards the downwind direction at an angle of 80 °~85 °, using its own weight to assist in closing and prevent backflow of wind.

• fixation methodConnect the door frame to the tunnel through anchor rods, steel wire ropes, and flower basket bolts, adjust the distance between the door frame and the two sides and top plate of the tunnel, ensure that the diagonal dimensions are the same, and avoid door leaf jamming.

3. Door leaf installation

• Connection between door shaft and door leafInsert one end of the door shaft with screws into the drilled hole of the door frame, ensuring that the door leaf is tightly in contact with the surrounding area of the door frame, without falling or tilting, and can be opened and closed freely.

• sealing treatmentWindproof curtains should be nailed to the lower part of the door leaf and the ditch, and pipeline holes should be tightly sealed with yellow mud to prevent air leakage.

4. Installation of auxiliary devices

• automatic deviceIf installing an automatic air door, components such as solenoid valves, cylinders, sensors, etc. need to be configured and debugged to be sensitive and reliable. For example, a pneumatic damper needs to be connected to a compressed air pipeline to test the cylinder's response time (≤ 0.5 seconds).

• Reverse air doorInstall reverse air doors between the intake and exhaust ducts, which should be closed during normal ventilation and should not be opened automatically due to wind pressure during reverse ventilation.

5. Debugging and acceptance

• Opening and closing testManually or automatically open and close the air door, check whether the door leaf moves smoothly, whether there is any jamming, abnormal noise or shaking.

• Sealing integrity testConfirm the fit between the sealing strip and the door frame through tactile or smoke testing. If any air leakage points are found, they should be repaired in a timely manner.

• Chain function verificationTest the interlocking device of two air doors to ensure that only one air door is open at the same time.