Small concrete mixer is determined by many parameters. It is impossible to describe a small concrete 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 small concrete 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 stirring is directly proportional to the specific gravity of fluid, the power standard of blade itself, the third power of rotating speed and the fifth power of blade diameter.

在必定功率及桨叶形式情况下，桨叶排液量（Q）以及压头（H）可以经过改变桨叶的直径（D）和转速（N）的匹配来调节，即大直径桨叶配以低转速（确保轴功率不变）的小型自上料混凝土搅拌罐车发生较高的活动效果和较低的压头，而小直径桨叶配以高转速则发生较高的压头和较低的活动效果。在搅拌槽中，要使微团彼此磕碰，办法是供给满足的剪切速率

Under the condition of certain power and blade form, the discharge volume (q) and head (H) of the blade can be adjusted by changing the matching of the diameter (d) and the rotating speed (n) of the blade, that is, the small concrete mixer with the large diameter blade and the low speed (ensuring the constant shaft power) will produce higher activity effect and lower head, while the small diameter blade with high speed will produce higher pressure Head and lower activity effect. In a stirred tank, the way to make the pellets collide with each other is to supply a shear rate that meets the requirements

从小型自上料混凝土搅拌罐车理看，正是因为流体速度差的存在，才使流体各层之间彼此混合，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，是搅拌应用中气泡涣散和液滴破碎等的原因。需求指出的是，整个搅拌槽中流体各点剪切速率的巨细并不是一致的。经过对剪切速率分布的研究标明，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，当桨叶直径必守时，剪切速率和均匀剪切速率都随转速的提高而添加。

From the perspective of small concrete mixer, it is because of the existence of fluid velocity difference that the fluid layers are mixed with each other. Therefore, the shear rate of fluid is always involved in the mixing process. Shear stress is a kind of force, which is the cause of bubble laxity and droplet breakage in stirring application. It is pointed out that the shear rate of each point in the whole stirred tank is not the same. The results show that there are at least four shear rate values in a stirred tank. They are as follows: for the blade region, the shear rate and uniform shear rate increase with the increase of the rotating speed, regardless of the size of the paddle and when the diameter of the blade must be kept.

但当转速必守时，剪切速率和均匀剪切速率与桨叶直径的关系与浆型有关。当转速必守时，径向型桨叶剪切速率随桨叶直径的添加而添加，而均匀剪切速率与桨叶直径巨细无关。这些有关桨叶区剪切速率的概念，在小型自上料混凝土搅拌罐车缩小及放大设计中需求特别留神。因小槽与大槽相比，小槽小型自上料混凝土搅拌罐车往往具有高转速（N）、小桨叶直径（D）及低叶尖速度（ND）等特性，而大槽小型自上料混凝土搅拌罐车往往具有低转速（N)大桨叶直径（D）及高叶尖速度（ND）等特性。

However, when the rotating speed must be kept, the relationship between the shear rate and uniform 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, while the uniform shear rate has nothing to do with the size of blade diameter. These concepts of shear rate in blade zone should be paid special attention to in the design of minitype concrete mixer. Compared with large tank, small tank small concrete mixer often has the characteristics of high speed (n), small blade diameter (d) and low blade tip speed (nd), while small concrete mixer with large tank often has characteristics of low speed (n), large blade diameter (d) and high blade tip speed (nd).

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