Drum mixer, also known as self-falling mixer, puts the mixture in a rotating mixing drum. With the rotation of the mixing drum, the blades in the drum lift the mixture to a certain height, and then spread it freely by its own weight. This is repeated until the mixture is uniform. This mixer usually mixes plastic and semi-plastic concrete.

Forced mixer is that the mixing drum is not moving, but the blades evenly placed on the rotating shaft in the drum are forced to mix. The mixer has good mixing quality and high production efficiency; However, the power consumption is large and the blade wears quickly. Generally suitable for mixing hard concrete.

Generally speaking: self-falling, drum turning; Forced axial rotation.