The automatic feeding mixer is a machine with a shaft with blades rotating in a cylinder or tank to mix a variety of raw materials into a mixture or suitable consistency. Today we will introduce the working principle of the mixer truck:

搅拌车是由多个参数决定的，用任何一个单一参数来描述一台搅拌车是不可能的。轴功率（P）、桨叶排液量（Q）、压头（H）、桨叶直径（D）及搅拌转速（N）是描述一台搅拌车的五个基本参数。桨叶的排液量与桨叶本身的流量准数，桨叶转速的一次方及桨叶直径的三次方成正比。而搅拌消耗的轴功率则与流体比重，桨叶本身的功率准数，转速的三次方及桨叶直径的五次方成正比。

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 the five basic parameters to describe a mixing truck. 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.

在一定功率及桨叶形式情况下，桨叶排液量（Q）以及压头（H）可以通过改变桨叶的直径（D）和转速（N）的匹配来调节，即大直径桨叶配以低转速（保证轴功率不变）的搅拌车产生较高的流动作用和较低的压头，而小直径桨叶配以高转速则产生较高的压头和较低的流动作用。在搅拌槽中，要使微团相互碰撞，的办法是提供足够的剪切速率。

Under 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 is equipped with a mixer with low speed (ensuring constant shaft power) to produce higher flow effect and lower pressure head, Small diameter blades with high speed produce higher head and lower flow. In the stirred tank, the solution to make the micro clusters collide with each other is to provide sufficient shear rate.

从搅拌车原理看，正是由于流体速度差的存在，才使流体各层之间相互混合，因此，凡搅拌过程总是涉及到流体剪切速率。剪切应力是一种力，是搅拌应用中气泡分散和液滴破碎等的真正原因。必须指出的是，整个搅拌槽中流体各点剪切速率的大小并不是一致的。通过对剪切速率分布的研究表明，在一个搅拌槽中少存在四种剪切速率数值，它们是：就桨叶区而言，无论何种浆型，当桨叶直径一定时，剪切速率和平均剪切速率都随转速的提高而增加。

From the principle of mixer truck, it is the existence of fluid velocity difference that makes the fluid layers mix with each other. Therefore, the mixing process always involves the fluid shear rate. Shear stress is a kind of stress, which is the real reason for bubble dispersion and droplet breakage in stirring application. It must be pointed out that the shear rate at each point of the fluid in the whole stirred tank is not consistent. The research on the distribution of shear rate shows that there are at least four shear rate values in a stirred tank. They are: in terms of blade area, no matter what slurry type, when the blade diameter is constant, the shear rate and average shear rate increase with the increase of rotating speed.

但当转速一定时，剪切速率和平均剪切速率与桨叶直径的关系与浆型有关。当转速一定时，径向型桨叶剪切速率随桨叶直径的增加而增加，而平均剪切速率与桨叶直径大小无关。这些有关桨叶区剪切速率的概念，在搅拌车缩小及放大设计中需要特别当心。因小槽与大槽相比，小槽搅拌车往往具有高转速（N）、小桨叶直径（D）及低叶尖速度（ND）等特性，而大槽搅拌车往往具有低转速（N)大桨叶直径（D）及高叶尖速度（ND）等特性。

However, when the rotating speed is constant, the relationship between the shear rate and the average shear rate and the blade diameter is related to the pulp type. When the rotating speed is constant, the shear rate of radial blade increases with the increase of blade diameter, and the average shear rate is independent of blade diameter. These concepts about the shear rate in the blade area need special attention in the reduction and amplification design of the mixer. Compared with the large tank, the small tank mixer often has the characteristics of high speed (n), small blade diameter (d) and low tip speed (nd), while the large tank mixer often has the characteristics of low speed (n), large blade diameter (d) and high tip speed (nd).

自动上料搅拌车的工作原理就简单介绍到这里了，如果您还有疑问，欢迎来电咨询。

The working principle of automatic feeding mixer is briefly introduced here. If you have any questions, please call us.