The stacker-reclaimer used in the circular coal yard is covered by the hemispherical shell of the coal tank. The stacker-reclaimer is concentrated in the revolving range of centering rotation, which is not affected by bad weather such as typhoon, and at the same time, the dust generated is small and trapped in a fixed area. Therefore, it solves the large-scale pollution of the surrounding environment caused by a large amount of dust generated by the operation of the stacker-reclaimer in the traditional open-pit coal yard, which is beautiful, environmentally friendly and has high comprehensive benefits. The stacker-reclaimer used in circular coal transportation places is generally a portal stacker-reclaimer (as shown in figure 1- 1). Its structural feature is that the stacker-reclaimer moves 360 degrees around the central column.