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各類粉體混合機粉體均化評測

发布时间: 2018-08-01
关键词:各類粉體混合機粉體均化評測
粉體混合是通過機械或流體方法使不同物理性質和化學性質的顆粒在宏觀上分布均勻的過程,簡言之是兩種以上的固態粉體物料在外力的作用下,其不均勻性降到^低的過程。隨著新材料的研發和工業化應用高速發展,粉體複合材料的均勻混合越來越重要。

Powder mixing is a process of uniform distribution of particles of different physical and chemical properties through mechanical or fluid methods. In short, the inhomogeneity of two or more solid powder materials is reduced to the lowest under the action of external force. With the rapid development of new materials and industrialization, the homogeneous mixing of powder composites becomes more and more important.



一、粉體混合定義及混合機理

One, mixing definition and mixing mechanism of powder

(一)粉料混合定義

(1) mixing definition of powder

粉體混合是指將兩種或兩種以上的不同成分的粉體混合均勻的過程。混合也是制備天天看高清影视整個過程的第一步,混合物各組分質量的分布均勻至關重要,因爲混料不均勻在後續工藝中是無法調整的。

Powder mixing refers to the process of mixing two or more than two different components of the powder evenly. Mixing is also the first step in the whole process of preparing the product. The distribution of the components of the mixture is very important, because the unevenness of the mixture can not be adjusted in the subsequent process.





粉體混合形式分類

Classification of mixed forms of powder



(2)混合機理

(2) mixing mechanism

粉體混合機理是粉體顆粒間相互擴散、對流、剪切,目前常用的混合方法有:三維混合,雙錐混合、球磨混合及先進的雙運動混合。雙運動混合是利用料桶的轉動和料桶內部葉片的轉動(轉動速度是料桶轉動速度的2倍)同時強制驅動粉體相互擴散、對流、剪切,形成複雜的運動,從而達到理想的混合效果。

The mixing mechanism of powder is the diffusion, convection and shear between particles. The common mixing methods are three dimensional mixing, double cone mixing, ball milling mixing and advanced double motion mixing. The double motion mixing is to make use of the rotation of the barrel and the rotation of the inner blade of the barrel (2 times the rotation speed of the barrel), and force the powder to spread, convective and shear, and form a complex motion, so as to achieve the ideal mixing effect.





二、影響粉體混合均化工藝的因素

Two. Factors affecting the homogenization process of powder mixing

(一)顆粒大小

(1) particle size

粗大的粉體顆粒具有較好的壓縮性,但成形性差;細小粉體顆粒成形性好,但壓縮性差,因此大小顆粒適當的搭配,能改善粉體的填充型,提高粉體的壓縮性和改善粉體的燒結性能。但是,粉體顆粒大小差異越大,越不易混合。細粉體易“搭橋”和相互黏附,妨礙顆粒的相互移動,不易均勻分散。

The coarse powder particles have good compressibility, but the formability is poor, the fine particle size is good, but the compressibility is poor, so the proper matching of the particles can improve the filling type of the powder, improve the compressibility of the powder and improve the sintering properties of the powder. However, the larger the particle size difference is, the less likely it is to mix. Fine powders are easy to bridge and adhere to each other, which impede the movement of particles and are not easy to disperse evenly.



(二)松裝密度(比重)

(two) the density of the loose assembly (specific gravity)

松裝密度差異越大,越不容易混合。松裝密度小的輕粉易漂浮,混合時,始終漂浮于上方,很難混入較重粉的組元裏,不易混合均勻。

The bigger the density difference is, the less easy it is to mix. The lightweight powder with small bulk density is easy to float. When mixing, it always floats above, so it is difficult to mix with the heavier powder components and difficult to mix evenly.



(三)流動性

(three) liquidity

粉體流動性差,顆粒間相互粘附,不利于粉體相互穿插移動、對流,不易于其他粉體混合均勻。

The powders have poor fluidity and adhere to each other, which is not conducive to the interpenetration and convection of powders, and is not easy to mix well with other powders.



(四)粉體性質

(four) the properties of powder

顆粒性質包括:粒子的粒度與粒度的分布,粒子的形狀、粗糙度,粒子的密度、靜電荷、水分含量、脆碎性、休止角、流動性、結團性以及彈性等。例如:粒子的形狀影響粒子的流動性,粒子的密度差異在混合中會發生密度偏析作用。

The particle properties include particle size and particle size distribution, particle shape, roughness, particle density, static charge, moisture content, fragility, repose angle, fluidity, mass and elasticity, etc. For example, the shape of particles affects the fluidity of particles, and the density difference of particles will result in density segregation.



三、常用的粉體混料機介紹

Three, introduction of common powder mixing machine

目前,常用的粉體混料機主要有:三維混合機、V型混合機、雙錐混合機。

At present, the commonly used powder mixer is mainly composed of three dimensional mixer, V mixer and double cone mixer.



(一)三維混合機

(I) three dimensional mixer

工作原理:裝料的桶體是在主動軸的帶動下,作周而複始的平移轉動和翻滾等複合運動,促使物料沿著桶體作環向、徑向和軸向的三向複合運動,從而實現多種物料的相互流動、擴散、積聚、摻雜,達到均勻混合的目的。

The working principle: the barrel body of the material is driven by the active axis, and makes the complex movement of moving and rolling round and rolling around, making the material move along the barrel body as the ring, radial and axial three direction compound movement, so as to realize the mutual flow, diffusion, accumulation and mixing of various materials, and achieve the purpose of uniform mixing.





三幹粉混合機優點:料桶內不存物料死角。

Three the advantage of dry powder mixer is that there is no material dead angle in the barrel.



缺點是:裝載率低,一般不超過60%;對于超輕粉、超細粉不易混合均勻,容易漂浮料桶上方,微觀上難以達到顆粒與顆粒之間充分均勻混合。

The disadvantage is: low loading rate, generally not more than 60%; for ultra light powder, ultrafine powder is not easy to mix evenly, easy to float on the top of the barrel, it is difficult to achieve a full and uniform mixing between particles and particles on the micro.

(二)幹粉混合機

(two) dry powder mixer

工作原理:利用混料機二圓柱桶長度不相等,行成不對稱的原理,當混料機轉動時物料從分解到組合,從組合到分解,推動物料進行橫向交流,每轉動一圈橫向力使部分物料從一個桶流向另一個桶,這樣物料橫向徑向混和,分解組合相互進行,使物料達到均勻的混合效果。

Working principle: using the two cylinder barrel length is not equal, the principle of asymmetrical line, when the mixing machine rotates the material from decomposition to combination, from combination to decomposition, to promote the material transversal communication, each rotation one circle of lateral force to make part material from one barrel to another, so that the material crosswise radial mixing, decomposition group Combined with each other, the material can achieve a uniform mixing effect.





V型混合機優點:當混合流動性好、物性相近似的混合物料時,可以得到較好的混合效果。

The advantages of the V mixer are that when mixed materials with good fluidity and similar physical properties are obtained, a better mixing effect can be obtained.



缺點是:當混合粉體物料物性差距較大時,一般不能得到理想的混合物;能耗較大大;顆粒間相互沖擊、摩擦較大,易改變粉體組元的基本特性,如:粒度變小,顆粒形狀改變。

The disadvantages are: when the material property gap is large, the ideal mixture can not be obtained; the energy consumption is much higher; the intergranular impact and the friction are large, which can easily change the basic characteristics of the powder component, such as the size of the particle and the shape of the particles.



(三)雙錐混合機

(three) double cone mixer

工作原理:將粉體加入到雙錐料桶中,隨著料桶的不斷旋轉,粉體物料在容器中進行複雜的撞擊運動,達到均勻的混合。

Working principle: the powder is added to the biconical barrel, and with the continuous rotation of the barrel, the powder material has a complex impact movement in the container to achieve a uniform mixing.



雙錐混合機優點:可以實現粉體間快速混合。

The advantages of double cone mixer are: quick mixing between powders.



缺點是:轉速過慢時,物料容易分層滾動,無法快速有效的摻入混合,而且容易形成球形結團粒。

The disadvantages are: when the rotational speed is too slow, the material is easy to roll in layers, can not mix quickly and effectively, and easy to form spherical agglomeration.





四、不同類型混合機應用領域

Four. Application fields of different types of mixers

(一)三維混合機

(I) three dimensional mixer

三維混合機廣泛應用于醫藥、化工、食品、飼料、農藥等天天看高清影视。不僅適用于普通粉體物料的混合,還應用于含油多、含糖多、粘度大、易燃、易爆、升溫固化、升溫軟化物料的混合。如藥物、粉體塗料(預混合及成品混合)、流平劑、食品加劑等,並可以和生産線配用。

Three dimensional mixer is widely used in medicine, chemical industry, food, feed, pesticide and other industries. It is not only suitable for the mixing of ordinary powder material, but also used in the mixture of oil containing more, more sugar, large viscosity, flammable, explosive, heating and curing, heating softening material. Such as drugs, powder coatings (premix and finished products mixed), leveling agent, food additives, etc., and can be used with the production line.



(二)V型混合機

(two) V type mixer

V型混合機適用于兩種以上幹粉狀、顆粒狀粉體物料的混合,尤其對微量的添加劑也可達到良好的混合效果,廣泛使用于制藥、化工、食品、塑料、化妝品、陶瓷、冶金等領域。

V mixer is suitable for mixing more than two kinds of dry powder and granular material, especially for small amount of additives. It is widely used in the fields of pharmaceutical, chemical, food, plastic, cosmetics, ceramics, metallurgy and so on.



(三)錐型混合機

(three) conical mixer

錐形混合機適用于固體與固體、固體與液體、液體與液體混合,廣泛用于化工、染料、石油、冶金、建材、稀土等領域。錐形混合機對熱敏性

The conical mixer is suitable for mixing solid and solid, solid and liquid, liquid and liquid. It is widely used in chemical industry, dye, petroleum, metallurgy, building materials, rare earth and other fields. Thermal sensitivity of conical mixer




國內某大型多品種氧化鋁企業的原料均化系統

Raw material homogenization system for a large variety of alumina enterprises in China

對于該大型原料均化系統,專業^認爲:

For the large-scale raw material homogenization system, professional experts believe that:



氧化鋁粉體加工過程采用均化也是借鑒了國外的先進經驗,日本昭和30年前就已經在工業化應用。原料均化目的是保證生産配料和工藝的穩定性,嚴格來說出廠天天看高清影视都應該保證品質的均勻穩定,同類規格天天看高清影视無論當期批次,還是不同時期的,都應質量保證一致。粉體原材料對一致性要求甚至大于天天看高清影视性質本身。

Homogenization of alumina powder is also a reference to the advanced experience of foreign countries, Japan Zhao and 30 years ago has been in industrial application. The purpose of raw material homogenization is to ensure the stability of the production of ingredients and processes. Strictly speaking, the products of the factory should ensure the uniform stability of the quality. The quality assurance of the products of the same specification should be consistent with the quality assurance, whether in the current period or in different periods. The consistency requirement of powder material is even greater than that of the product itself.



該大型均化系統一般工作原理是把不同時期和不同供應商的原料放入不同儲罐裏,通過皮帶稱多點計量下料,混合添加礦化劑。天天看高清影视出來後的均化,昭和做法就是把不同天天看高清影视先分類儲存在立罐裏,然後多點計量下料,氣動混合。

The general principle of the large-scale homogenization system is to put the raw materials in different periods and different suppliers into different storage tanks, measure the material by weighing the multi point on the belt and add the mineralizer. Homogenization after the product comes out, Zhaohe approach is to classify the different products stored in a can, and then multi-point measurement of cutting, pneumatic mixing.





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