The mixer of the self feeding mixer truck is a machine in which the shaft with blades rotates in the cylinder or tank to mix various materials into a mixture or proper consistency. The self feeding mixer will introduce the working principle of the mixer: the mixer is determined by multiple parameters, and it is impossible to describe the mixer with any one parameter. Shaft power (P), blade flow (Q), pressure head (H), blade diameter (D) and mixing speed (N) are the five basic parameters describing cement mixer trucks. The flow rate of the blade is proportional to the flow rate of the blade itself, the first power of the blade speed and the third power of the blade diameter. The shaft power consumed by the mixing truck is in direct proportion 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.

某些形式的葉片,葉片排水?dāng)?shù)量(Q)和壓頭(H)通過改變?nèi)~片的直徑(D)和速度(N)匹配調(diào)整,大直徑葉片與低速(保證軸功率恒定)水泥攪拌車高流量和低壓力水頭的影響,和小直徑葉片高速度生產(chǎn)低的壓頭和流量的影響。在攪拌槽中，使顆粒相互碰撞的方法是提供足夠的剪切速率。

For some types of blades, the discharge quantity (Q) and pressure head (H) of the blade are adjusted by changing the diameter (D) and speed (N) of the blade. The influence of large diameter blades and low speed (ensuring constant shaft power) cement mixer trucks on high flow and low pressure head, and the influence of small diameter blades on high speed production of low pressure head and flow. In the stirred tank, the method to make particles collide with each other is to provide sufficient shear rate.

自上料攪拌車從攪拌機(jī)理來看，正是由于流體速度的不同，使得流體層之間相互混合。因此，混合過程總是涉及到流體剪切速率。剪切應(yīng)力是攪拌過程中引起氣泡分散和液滴破裂的一種力。需要指出的是，攪拌槽內(nèi)流體各點的剪切速率是不均勻的。根據(jù)剪切速率分布的研究，攪拌槽中少有4個剪切速率值。它們是：在葉片區(qū)域，無論何種紙漿類型，當(dāng)葉片直徑固定時，大剪切速率和平均剪切速率都隨著轉(zhuǎn)速的增加而增加。

From the perspective of mixing mechanism, it is precisely because of different fluid velocities that fluid layers mix with each other. Therefore, the mixing process always involves the fluid shear rate. Shear stress is a force that causes bubble dispersion and droplet breakage during stirring. It should be pointed out that the shear rate of fluid at each point in the stirred tank is uneven. According to the study of shear rate distribution, there are at least 4 shear rate values in the stirred tank. They are: in the blade area, no matter what type of pulp, when the blade diameter is fixed, the large shear rate and average shear rate increase with the increase of rotating speed.

當(dāng)轉(zhuǎn)速一定時，大平均剪切速率與葉片直徑的關(guān)系與紙漿形狀有關(guān)。當(dāng)轉(zhuǎn)速一定時，徑向葉片的大剪切速率隨葉片直徑的增大而增大，而平均剪切速率與葉片直徑無關(guān)。這些葉片剪切速率的概念在攪拌器的放大和縮小設(shè)計中需要特別注意。與大缸相比，小缸水泥攪拌車通常具有高速(N)、小葉徑(D)和低葉尖速度(ND)的特點，而大缸自上料攪拌車通常具有低速(N)、大葉徑(D)和高葉尖速度(ND)的特點。

When the rotation speed is constant, the relationship between the large average shear rate and the blade diameter is related to the pulp shape. When the rotating speed is constant, the large shear rate of the radial blade increases with the increase of the blade diameter, while the average shear rate is independent of the blade diameter. These blade shear rate concepts require special attention in the design of the scale-up and downsizing of the agitator. Compared with large cylinders, small cylinder cement mixers are generally characterized by high speed (N), small blade diameter (D) and low tip speed (ND), while large cylinder self loading mixers are generally characterized by low speed (N), large blade diameter (D) and high tip speed (ND).