Coal mill with oil return pipes

Disclosed is a coal mill with oil return pipes. The coal mill with the oil return pipes comprises a decelerator (1) of the coal mill, a dilute oil station (2) and an A oil return pipe (3), an oil outlet of the dilute oil station (2) is communicated with an oil inlet of the decelerator (1) through a pipeline, an oil outlet of the decelerator (1) is communicated with an oil inlet of the dilute oil station (2) through the A oil return pipe (3), a valve (3-1) is arranged on the A oil return pipe (3), the coal mill with the oil return pipes also comprises a B oil return pipe (4), an oil inlet and an oil outlet of the B oil return pipe (4) are communicated with the A oil return pipe (3) respectively, and the oil inlet and the oil outlet of the B oil return pipe (4) are arranged on the oil outlet location of the decelerator (1) and the oil inlet location of the dilute oil station (2) respectively. The oil return pipes guarantees that the decelerator can maintain oil lubrication and normal production is achieved when malfunctions appear in oil-supply dilute oil station and the decelerator oil-dividing point.