General Introduction Semi-trailers for concrete mixing and transportation have been widely used around the world. European and American countries have relatively strict requirements for axle load. Compared with rigid trucks, semi-trailer mixers increase the tank volume and the number of axles, reducing the damage of the road surface. With the improvement of domestic concrete mixer truck regulations and increased enforcement efforts, the advantages of large loading capacity of concrete mixer semi-trailers will become more and more obvious. In order to meet customers' pursuit of maximum benefits, CIMC Ruijiang has developed series products of concrete mixer semi-trailer trucks, which have been recognized by the market and praised by customers a lot.