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浅议自动搅拌一体车的工作原理

所属分类：常见问题发布时间：2020-12-10 来源：http://www.shanqijituan.cn/ 浏览量：0

自动搅拌一体车，是一种带有叶片的轴在圆筒或槽中旋转，将多种原料进行搅拌混合，使之成为一种混合物或适宜稠度的机器。今天我们为大家介绍一下的搅拌机工作原理：

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

搅拌机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。

Mixer is determined by many parameters. It is impossible to describe a mixer with any single parameter. Shaft power (P), blade discharge (q), head (H), blade diameter (d) and stirring speed (n) are the 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 stirring is directly proportional to the specific gravity of the fluid, the power criterion 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 the condition of certain power and blade form, the discharge volume (q) and head (H) can be adjusted by changing the matching of diameter (d) and speed (n) of blades, that is, large diameter blades with low speed (ensuring the same shaft power) produce higher flow effect and lower head, while small diameter blades with high speed produce higher head and lower head Mobility. In the stirred tank, the solution is to provide enough shear rate to make the micro clusters collide with each other.

自动上料搅拌机

Automatic feeding mixer

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 shear rate of fluid is always involved in the mixing process. Shear stress is a kind of force, which is the real cause of bubble dispersion and droplet breakup in stirring applications. It must be pointed out that the shear rate of fluid 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 average shear rate increase with the increase of the rotating speed, regardless of the size of the impeller.

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 shape. When the rotating speed is constant, the shear rate of radial blade increases with the increase of blade diameter, but the average shear rate has nothing to do with the blade diameter. These concepts about the shear rate in the blade zone need to be taken care of in the 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 blade tip speed (nd), while the large tank mixer often has the characteristics of low speed (n), large blade diameter (d) and high blade tip speed (nd).

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