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:

攪拌車是由多個參數(shù)決定的，用任何一個單一參數(shù)來描述一臺攪拌車是不可能的。軸功率（P）、槳葉排液量（Q）、壓頭（H）、槳葉直徑（D）及攪拌轉(zhuǎn)速（N）是描述一臺攪拌車的五個基本參數(shù)。槳葉的排液量與槳葉本身的流量準數(shù)，槳葉轉(zhuǎn)速的一次方及槳葉直徑的三次方成正比。而攪拌消耗的軸功率則與流體比重，槳葉本身的功率準數(shù)，轉(zhuǎn)速的三次方及槳葉直徑的五次方成正比。

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.

在一定功率及槳葉形式情況下，槳葉排液量（Q）以及壓頭（H）可以通過改變槳葉的直徑（D）和轉(zhuǎn)速（N）的匹配來調(diào)節(jié)，即大直徑槳葉配以低轉(zhuǎn)速（保證軸功率不變）的攪拌車產(chǎn)生較高的流動作用和較低的壓頭，而小直徑槳葉配以高轉(zhuǎn)速則產(chǎn)生較高的壓頭和較低的流動作用。在攪拌槽中，要使微團相互碰撞，的辦法是提供足夠的剪切速率。

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.

從攪拌車原理看，正是由于流體速度差的存在，才使流體各層之間相互混合，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，是攪拌應用中氣泡分散和液滴破碎等的真正原因。必須指出的是，整個攪拌槽中流體各點剪切速率的大小并不是一致的。通過對剪切速率分布的研究表明，在一個攪拌槽中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，當槳葉直徑一定時，剪切速率和平均剪切速率都隨轉(zhuǎn)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.

但當轉(zhuǎn)速一定時，剪切速率和平均剪切速率與槳葉直徑的關(guān)系與漿型有關(guān)。當轉(zhuǎn)速一定時，徑向型槳葉剪切速率隨槳葉直徑的增加而增加，而平均剪切速率與槳葉直徑大小無關(guān)。這些有關(guān)槳葉區(qū)剪切速率的概念，在攪拌車縮小及放大設計中需要特別當心。因小槽與大槽相比，小槽攪拌車往往具有高轉(zhuǎn)速（N）、小槳葉直徑（D）及低葉尖速度（ND）等特性，而大槽攪拌車往往具有低轉(zhuǎn)速（N)大槳葉直徑（D）及高葉尖速度（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).

自動上料攪拌車的工作原理就簡單介紹到這里了，如果您還有疑問，歡迎來電咨詢。

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