Mine ventilation

3. Longitudinal wind barrier

The longitudinal wind barrier is a wind wall laid along the length of the roadway. It divides the roadway into two compartments, one for air intake and the other for air exhaust. The longitudinal wind barrier can be used in the ventilation of long single-head roadway. The longitudinal wind barrier is used to form a comb ventilation network in Pangushan tungsten mine to eliminate the series of polluted air. Longitudinal wind barriers can be constructed with wood, masonry or concrete.

4. Airtight walls

Closed walls, also known as wind walls, are structures that block air flow, usually laid in non-production laneway, which can be masonry or concrete. Temporary airtight can be nailed by wooden posts, boards and waste duct cloth.

The sealing of the patio can be made of wood, steel or cement board at the upper entrance of the patio. In the place affected by blasting shock wave, suspension sealing can be used. Place two steel beams horizontally at the mouth of the patio, suspend the lifting plate with steel rope, go 1~1.5m below the wellhead, pile several layers of broken bags on the lifting plate, and then fill the gaps with soil and gravel. This kind of suspension sealing has certain seismic ability.

5. Damper

In the ventilation system, it is necessary to cut off the air flow, and it is necessary to establish the air gate for pedestrians or traffic. In the process of exhaust air, only pedestrians do not traffic or traffic is not much, can build a common damper. Automatic air damper should be constructed in the main transportation lanes with frequent traffic and pedestrians.

Ordinary damper can be made of wood or iron plate. The slanted contact between the door and the door frame of the wooden damper is relatively tight and the structure is solid. The opening direction of the damper should face the wind flow, so that after the damper is closed, it is kept tight by the wind pressure. The door frame and door shaft should be tilted 80°~85°, so that the damper can be closed by its own weight. In order to prevent air leakage and maintain a stable air flow, two or more air doors should be set up at the same time.

6. Wind measuring station

In order to measure the air volume accurately, wind measuring stations should be set up in each main inlet and exhaust roadway of mine. There are the following requirements for establishing an anemometer station.

(1) The anemometer station shall be located in the straight roadway, there shall be no obstacles in the station, and the surrounding wall of the roadway shall be smooth and smooth.

(2) The length of the anemometer station should be greater than 4m, and the section should be greater than 4m².

(3) The length of the roadway in the straight section before and after the station should be greater than 10m.