Colloid mill, also known as the dispersed mill, the working components from a fixed grinding body (stator) and a high-speed rotation of the grinding body (rotor), between the two grinders can be adjusted a small gap. When the material through the gap, due to the high-speed rotation of the rotor (the linear velocity is generally 13 ~ 40m / s), so that the material attached to the rotor surface speed maximum, and attached to the stator surface material speed is zero. This produces a sharp velocity gradient, so that the material subjected to strong shear, friction and turbulence, resulting in ultra-fine grinding effect.
It can be seen, the relative motion between the stator and the rotor is the colloid mill work to obtain the fineness of the main guarantee. Only to improve the line speed of the rotor, in order to achieve good clothing processing effect. However, high-speed operation will inevitably produce a lot of heat, and requires the precision of the parts with each other must be very precise, but also for cooling.
Colloid mill its main structure consists of grinding head components, base transmission components, dedicated motor three parts. One of the grinding head part of the moving disc and the static disc is the key to the machine part, so, according to the nature of the material being processed different selection must be different. But the material is made of stainless steel. Siamese type (also known as vertical) motor according to the different models need to make special design, the motor flange side of the retaining disk to prevent leakage.
Relative to the pressure homogenizer, colloid mill is a centrifugal device, its advantages are simple structure, equipment maintenance and easy for higher viscosity materials and larger particles of the material.
① in a very short period of time to achieve the suspension of solids in the ultra-fine grinding, that is, micro-particles, while both mixing, stirring, dispersing and emulsifying effect, finished particle size up to 1 μ m;
② efficiency and high output, about ball mill and roller mill efficiency more than 2 times;
③ by adjusting the gap between the two grinders, the smallest can reach 1μ m look, to achieve the purpose of controlling the finished particle size;
④ simple structure, easy operation, small footprint. Because the gap between the fixed disc and the grinding disc is extremely small, the machining accuracy is high.
The main disadvantage of vertical colloid grinding is also caused by its structure. First of all, as a result of centrifugal movement, the flow is not constant, corresponding to the different viscosity of the material flow varies greatly. For example, the same equipment, in dealing with viscous paint materials and thin milk fluid, the flow rate can be more than 10 times; Second, the stator and the material between the high-speed friction, it is easy to produce large heat, In addition, the domestic small-scale
colloid mill is often due to lack of power, sealing performance is poor and can not be a long time to work continuously.Therefore,
