The distance between the two entrance lights is not more than 30m.
Mining is an important production link in coal mine production, with equal emphasis on mining and mining first. Rapid excavation of coal mine roadway is a key technical measure to ensure high and stable production of coal mine, and the level of mining technology and equipment is directly related to the production capacity and safety of coal mine. High-efficient mechanized excavation and support technology is a necessary condition to ensure high production and high efficiency in mines, and it is also the development direction of roadway excavation technology. With the development of fully mechanized mining technology, super working faces with an annual output of millions or even tens of millions of tons have appeared in China, which greatly increases the number of mining roadways consumed every year, making roadway excavation a key technology for efficient and intensive production in coal mines.