Ball mills are divided into dry ball mills and wet ball mills. Today, Fodamon engineer explained that improving the internal ventilation of the ball mill to improve the working efficiency of the ball mill refers to the dry ball mill system using the powder concentrator to form a closed cycle.
The ventilation function of the ball mill is: first, discharge the fine powder in the mill in time to avoid affecting the grinding efficiency. Second, reduce the temperature in the mill to avoid blocking the paste ball in the gypsum dehydration tail bin. When the material moisture in the ball mill is too large and the mill ventilation is poor, it is difficult to discharge the water vapor in the mill, which not only sticks to the wet fine powder and blocks the grate joint, but also reduces the material throughput and flow rate per unit time. At the same time, when these Abrasives grind materials, due to static electricity, a buffer layer will be attached to the working surface of the lining plate, which will greatly weaken the impact crushing function of the abrasives on the materials.
When the thickness of fine powder adhered to the surface of the lining plate reaches 1mm, the impact force of the grinding body on the material can be reduced to one-third, resulting in a decrease in the output of the mill and an increase in the power consumption of grinding. When the internal ventilation of the energy-saving ball mill is poor, a relatively simple solution is to add an axial flow fan on the upper part of the exhaust cylinder of the mill tail, and seal and plug the leakage of the rotary screen and discharge chute of the mill to prevent the short circuit of the mill ventilation caused by air leakage. In this way, the internal ventilation of the mill is smooth, and the problem of ash emission from the grinding head is also solved.
Similarly, the air lock system must also be done well, otherwise the fan air is directly pumped away from the discharge port, forming a ventilation short circuit, and there will be little air in the mill. Then we need to know the wind speed inside the control equipment. As for the selection of wind speed in the mill, generally speaking, natural ventilation v-0.4m/s and strong ventilation v = 0.7m/s. Some foreign factories believe that the wind speed V of strong ventilation should be 0.5 9 ~ 1.0 m / s. However, it can be seen from figure 3-262. When v = 0.7m/s, the output will no longer increase, so v = 0.7m/s can be considered as the better wind speed.
To sum up, reasonably controlling the internal ventilation and wind speed of the ball mill can not only realize the high yield and high quality of the ball mill, but also reduce the failure of the ball mill, reduce the maintenance cost and improve the enterprise benefit!