Abstract: The coal bunker is the key part of the continuous transportation system of coal mine. In order to improve its service life and reduce the shutdown maintenance time, the wall structure and closing position of the lower entrance of the coal bunker are improved, which not only improves the impact resistance of the wall, but also make sure the safty of workers and equipments when loading room has been brokendown. In order to ensure the normal use of the air gun, according to the flow characteristics of the coal flow in the bin and the production experience, the layout and protection mode of the air gun are improved, and solve the problem that the air gun shutdown when its broken. Through continuous improve design of coal bunker, it has been proved that the structure is reasonable, safe and reliable, and the maintenance period is prolonged after years of use, which has guiding significance for coal bunker design.

Key words: coal mine, design, coal bunker, air cannon