Mixing machine classification and display
2024-06-28 12:06:31
Common mixers are divided into four categories: gas and low viscosity liquid mixers, medium and high viscosity liquid and paste mixing machines, thermoplastic material mixers, and powdered and granular solid materials mixing machines.
Mixing machine
Gas and low viscosity liquid mixers are characterized by a simple structure and no rotating parts, low maintenance and repair, and low energy consumption. This type of mixing machine is divided into four types: airflow mixing, pipe mixing, jet mixing and forced circulation mixing.
Paste mixing machine
Mixing machines for medium and high viscosity liquids and pastes generally have strong shearing action.
Thermoplastic material mixing machine
Thermoplastic material mixing machines are mainly used for mixing thermoplastic materials (such as rubber and plastics) with additives; powdered and granular solid materials mixing machines are mostly intermittent operations, and also include machines that combine mixing and grinding, such as rim machines.
All materials involved in the mixing are required to be evenly distributed during mixing. The degree of mixing is divided into three states: ideal mixing, random mixing, and completely unmixed. The degree of mixing of the various materials in the mixing machine depends on factors such as the proportion of the material to be mixed, the physical state and characteristics, and the type of mixing machine used and the duration of the mixing operation.
The mixing of the liquid mainly relies on a mechanical agitator, a gas stream and a jet of the liquid to be mixed, etc., so that the material to be mixed is agitated to achieve uniform mixing. The agitation causes a portion of the liquid to flow, which in turn pushes the liquid around it, with the result that a circulating liquid flow is formed within the solution, and the resulting diffusion between the liquids is referred to as bulk convection diffusion. When the flow rate of the liquid caused by the agitation is high, shear occurs at the interface between the high-speed liquid stream and the surrounding low-speed liquid stream, thereby generating a large number of local vortices. These vortices rapidly spread around, and more liquid is drawn into the vortex. The turbulent convection diffusion formed in a small range is called eddy diffusion.
The moving parts of the mechanical agitator also shear the liquid when it is rotated. The liquid is also subjected to shearing action when flowing through the wall and various fixing members installed in the container. These shearing actions will cause many Local eddy current diffusion.
For liquids of different density, composition, and incompatibility, the shearing action caused by the agitation and the strong turbulence shred the dense liquid into small droplets and uniformly disperse it into the main liquid. The flow rate of the liquid produced by the agitation must be greater than the settling velocity of the droplets.
Solid material mixing machine
The mixing mechanism of a small amount of insoluble powdery solid and liquid is different from the density component, and the mixing mechanism of the mutually incompatible liquid is the same, except that the stirring cannot change the particle size of the powdery solid. If the solid particles before mixing cannot be made to have a sedimentation rate lower than the flow rate of the liquid, a uniform suspension cannot be formed regardless of the stirring method.
The mixing of different pastes is mainly to repeatedly divide the material to be mixed and subject it to strong shearing action caused by pressing, squeezing, squeezing, etc., and then repeatedly combine and knead, and finally reach the required mixing degree. This kind of mixing is difficult to achieve the ideal mix, only to achieve random mixing. The powdery solid is mixed with a small amount of liquid to form a paste, and the mixing mechanism is the same as that of the paste material.
Different thermoplastic materials and the mixing of thermoplastic materials with a small amount of powdery solids need to rely on strong shearing, repeated kneading and kneading to achieve random mixing.
Common mixers are: square cone mixer, motion mixer, double cone mixer, double spiral cone mixer, unpowered twin shaft blade mixer, horizontal ribbon mixer, vertical high speed mixer, V Mixer, etc.
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