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.

在必定功率及槳葉形式情況下，槳葉排液量（Q）以及壓頭（H）可以經(jīng)過改變槳葉的直徑（D）和轉速（N）的匹配來調(diào)節(jié)，即大直徑槳葉配以低轉速（確保軸功率不變）的小型自上料混凝土攪拌罐車發(fā)生較高的活動效果和較低的壓頭，而小直徑槳葉配以高轉速則發(fā)生較高的壓頭和較低的活動效果。在攪拌槽中，要使微團彼此磕碰，辦法是供給滿足的剪切速率

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

從小型自上料混凝土攪拌罐車理看，正是因為流體速度差的存在，才使流體各層之間彼此混合，因此，凡攪拌過程總是涉及到流體剪切速率。剪切應力是一種力，是攪拌應用中氣泡渙散和液滴破碎等的原因。需求指出的是，整個攪拌槽中流體各點剪切速率的巨細并不是一致的。經(jīng)過對剪切速率分布的研究標明，在一個攪拌槽中至少存在四種剪切速率數(shù)值，它們是：就槳葉區(qū)而言，無論何種漿型，當槳葉直徑必守時，剪切速率和均勻剪切速率都隨轉速的提高而添加。

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.

但當轉速必守時，剪切速率和均勻剪切速率與槳葉直徑的關系與漿型有關。當轉速必守時，徑向型槳葉剪切速率隨槳葉直徑的添加而添加，而均勻剪切速率與槳葉直徑巨細無關。這些有關槳葉區(qū)剪切速率的概念，在小型自上料混凝土攪拌罐車縮小及放大設計中需求特別留神。因小槽與大槽相比，小槽小型自上料混凝土攪拌罐車往往具有高轉速（N）、小槳葉直徑（D）及低葉尖速度（ND）等特性，而大槽小型自上料混凝土攪拌罐車往往具有低轉速（N)大槳葉直徑（D）及高葉尖速度（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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