The power output is transmitted from the power end to the agitator through the transmission shaft (usually solid shaft) and mixing shaft, and the mixing shaft must have sufficient strength.The mixing shaft should not only be connected with the mixer, but also pass through the shaft seal device, bearings, couplings and other parts, so the mixing shaft should also have a reasonable structure, high processing accuracy and fitted tolerance. According to the support details, the mixing shaft can be divided into cantilever type and single span type. Cantilever mixing shaft is not equipped with intermediate bearing or bottom bearing, it is convenient for maintenance and repair. Especially for biological, food or drug mixing equipment with high cleanliness requirements, the components in the equipment are reduced.