The power take-off drives the power of the engine through the small transmission shaft to drive the hydraulic motor of the hydraulic pump to rotate, and through the reducer to drive the mixing barrel to rotate. During the transportation of concrete, it is necessary to keep the mixing tank rotating at a low speed of 1-3 revolutions per minute to ensure the homogeneity of the concrete and prevent the segregation of the concrete, which is called stirring (commonly known as stirring).