Mixer is a kind of construction machinery, which is mainly used to mix cement, sand, all kinds of dry powder mortar and other building materials. This is a machine with a shaft with blades rotating in a cylinder or tank to stir and mix a variety of raw materials into a mixture or suitable consistency. There are many kinds of mixers, including forced mixer, single horizontal shaft mixer, double horizontal shaft mixer and so on. working principle The mixer is determined by multiple parameters. It is impossible to describe a mixer with any single parameter. Shaft power (P), blade discharge (q), head (H), blade diameter (d) and mixing speed (n) are five basic parameters to describe a mixer. The discharge volume of the blade is directly proportional to the flow standard of the blade itself, the first power of the blade speed and the third power of the blade diameter. The shaft power consumed by mixing is directly proportional to the specific gravity of the fluid, the power standard of the blade itself, the third power of the rotating speed and the fifth power of the blade diameter. Under the condition of certain power and blade form, the discharge volume (q) and pressure head (H) of the blade can be adjusted by changing the matching of the diameter (d) and speed (n) of the blade, that is, the large-diameter blade with a mixer with low speed (ensuring constant shaft power) will produce higher flow effect and lower pressure head, while the small-diameter blade with high speed will produce higher pressure head and lower flow effect. In the stirred tank, the only way to make the micro clusters collide with each other is to provide sufficient shear rate. From the mixing mechanism, it is the existence of fluid velocity difference that makes the fluid layers mix with each other.