Factors affecting the efficiency and quality of the grinding machine

Factors affecting the efficiency and quality of the grinding machine 1, grinding bead density and hardness 2, grinding bead particle size and surface finish 3, the effect of cooling water temperature on grinding efficiency 4, the effect of grinding bead filling rate on grinding efficiency 5. Flow rate of material to be ground

Factors affecting the efficiency and quality of the grinding machine

1, grinding bead density and hardness

Under normal circumstances, the larger the proportion of the grinding bead, the greater the impulse, the higher the grinding efficiency, and the contact parts of the sand mill (inner cylinder, dispersion disc, etc.) wear is relatively large, so the viscosity and flow of the slurry become the key. Low density grinding bead is suitable for low viscosity slurry, high density grinding bead is suitable for high viscosity slurry. The harder the grinding bead, the lower the wear rate of the bead theoretically. For example, from the abrasion situation of the grinding bead on the contact parts of the sand mill (dispersion dish, rod pin and inner cylinder, etc.), the abrasion of the hard grinding bead on the contact part is larger, but the optimal optimization point can be reached by adjusting the filling amount of the bead, the viscosity of the slurry, the flow rate and other parameters.

2, grinding bead particle size and surface finish

The size of the grinding bead determines the number of contact points between the grinding bead and the material, and the more contact points of the beads with small particle size under the same volume, the higher the grinding efficiency in theory, but this is not absolute. When grinding materials with relatively large initial particles, such as 100 micron slurry, smaller beads may not be useful because the impulse of small beads does not reach the energy of sufficient grinding dispersion, and larger beads should be used in this case.

For the same material, the wear rate is proportional to the surface finish of the grinding medium, so the surface of the grinding medium is required to be smooth to reduce the wear rate. At the same time of grinding grinding materials, grinding beads will also have a certain amount of wear, wear grinding bead material mixed with the slurry is difficult to separate, affecting product quality, so in a general sense, grinding bead surface the brighter the better.

3, the effect of cooling water temperature on grinding efficiency

The cooling water temperature is one of the factors that play an important role in the grinding efficiency of the grinding mill. In the case of intense movement of the grinding medium, the mechanical energy is converted into heat energy and a lot of heat is generated. As the temperature increases, the material to be ground will agglutinate, and the quality of the finished particles will decrease. The temperature of the ling water directly affects the working temperature of the grinding room, thus affecting the grinding efficiency. It can be found from some tests that under the same conditions, the grinding efficiency of using l5℃ frozen water is more than 30% higher than that of using 22℃ circulating water, so the proper control of cooling water temperature can greatly improve the grinding efficiency.

4, the effect of grinding bead filling rate on grinding efficiency

The filling rate of the grinding medium has a direct impact on the grinding efficiency of the sand mill. The greater the filling rate of the grinding medium, the greater the contact frequency of the grinding medium, the larger the dispersion grinding capacity, and the smaller the particle size of the product in the same grinding time. After repeated tests, the filling rate of 80% to 85% is the best. When the filling rate exceeds 85%, the phenomenon of "bead grinding bead" will occur, and the temperature in the grinding room will rise rapidly, and the wear will increase sharply.

5. Flow rate of material to be ground

The flow rate of the material to be ground in the production process should be adjusted correctly. Too fast flow rate will result in coarser product size, high pressure and temperature in the grinding chamber. Too slow a flow rate results in inefficient production.