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混合机的原理及应用

the theory and application of mixing machine

 

混合机是利用机械力和重力等作用,将两种或两种以上物料均匀混合起来的机械。混合机械广泛用于制药、食品、化工、农业、建筑等各类工业生产和日常生活中。

混合机可以将多种物料配合成均匀的混合物,如在制药行业,把不同成分的原料均匀混合在一起组成复方;还可以增加物料接触表面积,以促进化学反应;还能够加速物理变化,例如粒状溶质加入溶剂,通过混合机械的作用可加速溶解混匀。

常用的混合机械分为气体和低粘度液体混合机、中高粘度液体和膏状物混合机、热塑性物料混合机、粉状与粒状固体物料混合机四大类。

这里主要介绍一下固体物料混合机。

粉状、粒状固体物料混合机多为间歇操作,目前市场上有V型混合机、三维混合机和槽型混合机这三种机型。

混合时要求所有参与混合的物料均匀分布。混合的程度分为理想混合、随机混合和完全不相混三种状态。各种物料在混合机械中的混合程度,取决于待混物料的比例、物理状态和特性,以及所用混合机械的类型和混合操作持续的时间等因素。

流动性好的颗粒状固体物主要是靠容器本身的回转,或靠装在容器内运动部件的作用,反复地翻动、掺和而得以混合,这种情况一般使用V型混合机。

流动性不是很好、比例差别比较大的物料靠单纯的回转作用是不够的,需要多方位多角度的作用才能够做到充分混合。这种情况一般使用三维混合机或者多维混合机。

流动性很差的、互相发生粘附的颗粒或粉状固体,则常需用带有机械翻动和压、辗等动作的混合机,这种情况一般使用槽型混合机。

The mixer is used to mix two or more kinds of material by the mechanical force and gravity. It is widely used in pharmacy, chemical, agriculture, construction and other industry and daily life.

The mixer can mix many kinds of material evenly, for example, in Pharmacy, different material mixed together to be polypharmcy, the mixing also can increase the contact area, and improve the chemical reaction, also accelerate the physic changes, i.e. feeding dissolvent in granny solvent, the solution can be accelerated by mixer.

The frequent-used 4 mixers are gas and low viscosity liquid mixer, middle and high viscosity liquid and cream mixer, thermo plasticity mixer, and powder and granny solid mixer

Now, we mainly introduce the solid material mixer, it is discontinuous operated, there are 3 models in this type, V-shape mixer, three-D mixer and groove shape mixer. It need all the raw materials are uniform distributed. The mixer results in 3 conditions, there are idea mixing, random mixing and absolutely not mixing. It depends by the mixing ratio, physic condition and prosperity, the type of mixer and the last time of mixing.

The good liquidity granny material is mixed by the rotation of vessel, or rotating parts inside the vessel, mixed by repeating the action of stir, admix, normally, V-shape mixer is used in this kind of mixing.

The low liquidity material, the mixing ratio is big, single rotation is not enough, multi-angle mixing is requirement, so the three-D mixer is applied in this kind of mixing.

The bad liquidity material , powder or granny solid material which adhering each other, it needs the mixer with mechanic stir, press and rolling action. Groove shape mixer is used for this mixing.

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