1. the greater the spindle speed, the greater the centrifugal force obtained by the grinding medium, the greater the speed difference between the grinding medium, the greater the shear force and friction force.The larger the rotor linear velocity is, the less grinding time is required to achieve the particle content percentage of particle size.
2.The influence of the specific gravity of grinding medium on the efficiency of sand mill. There are many kinds of grinding medium, and their specific gravity is different.From the dynamic point of view, the greater the proportion of grinding media, it obtained the energy, the greater the impact force and shear force also increases accordingly, grinding efficiency is increased, in addition, combined with the proportion of material, the proportion of the grinding media and material difference, the greater the grinding effect is better, general mechanical surface hardness, good mechanical strength zirconium beads, zirconium silicate bead, zirconia beads, pure zirconium beads) as grinding media.
3. Influence of grinding medium diameter on the efficiency of sand mill.The grinding diameter is related to the maximum particle size of the raw material.The larger the maximum grain size of the raw material is, the greater its strength will be, and the larger the diameter of the grinding medium is required to enable the grinding medium to have sufficient dispersing and grinding capacity. However, the larger the particle size of the grinding medium is, the larger the particle size of the final product will be
4. Influence of filling rate of grinding medium on grinding efficiency.The larger the filling of the grinding medium, the higher the contact frequency of the grinding medium, and the larger the dispersive grinding capacity, and the smaller the particle size of the product within the same grinding time.In addition, the filling rate of the grinding medium is related to the viscosity of the material, the temperature of the material when grinding, for low viscosity solvents and water-based inks, the filling rate can be slightly larger.By trial and error.The filling rate of wet grinding sand mill is 70% - 80%.
5. Grinding medium density:
Theoretically, under the same conditions, the higher the density of the grinding bead, the greater the impulse, the higher the grinding efficiency, and the contact parts of the sanding machine (inner cylinder, pin bar and dispersed disk, etc.) wear will be relatively large.Low density abrasive bead is suitable for low viscosity paste, high density abrasive bead is suitable for high viscosity paste.
6. Hardness of grinding medium:
Theoretically, under the same conditions, the higher the hardness of the abrasive beads, the lower the wear rate of the beads.For example, from the grinding bead to the contact of the grinding machine (cylinder, pin bar and dispersed disk, etc.) wear, hardness of the grinding bead to the contact of the wear is larger, but by adjusting the filling amount of the bead, sand mill speed, flow and other parameters can achieve the best grinding efficiency.
7. Surface smoothness of grinding medium
Theoretically, under the same conditions, the wear rate is inversely proportional to the smoothness of the surface of the grinding medium, so the surface of the grinding medium is required to be relatively smooth to reduce the wear rate.While grinding and grinding materials, grinding beads will also have a certain wear rate, grinding bead materials will be mixed with slurry after difficult separation, which affects the quality of the product, so in a general sense, the more smooth the surface of grinding beads grinding quality will be higher.
8. Cooling water temperature
The temperature of cooling water is also one of the factors that play an important role in the grinding efficiency of the sand mill. In the case of intense movement of the grinding medium, the mechanical energy is converted into heat energy and a large amount of heat is generated.With the increase of grinding time, the temperature will increase accordingly. At this time, the grinding materials will agglutinate and the quality of finished products will decline.The temperature of cooling water directly affects the working temperature of the grinding chamber, thus affecting the grinding efficiency.According to some data, under the same conditions, the grinding efficiency of frozen water at 15℃ is more than 30% higher than that of circulating water at 22℃. Therefore, proper control of cooling water temperature can greatly improve the grinding efficiency.
9. Flow rate of materials to be ground
The flow rate of materials to be ground during production should be adjusted correctly.Too fast flow rate will result in coarse product size, high pressure and temperature in the grinding chamber.Slow flow leads to low productivity.
