There are wind bridges, air doors, cut holes and transportation tunnels in the coal mine. Ask experts to help explain these concepts and how they work.

Wind bridge is a bridge-shaped roadway designed to solve the problem that ventilation and airflow cannot be mixed when two roadways cross at the same level. The popular understanding is that one roadway passes above or below another roadway, and the airflow cannot be mixed.

Air door is a facility for cutting off air flow, which can be divided into air door and air door.

Cut is the place where the excavated roadway is used to install coal mining equipment, and it becomes the working face when mining.

The transportation gateway is a roadway connecting the working face, and a belt conveyor is generally installed to transport the coal extracted from the working face.