By: FTM Machinery May 08th,2021
Technical personnel know that the temperature of the ball mill is likely to be too high due to the impact of grinding minerals, the mechanical friction energy of the grinding material and the energy released when the material is broken. In addition to the high temperature in summer, the working environment can even be as high as 40 or 50 degrees. The long-term high temperature state of the ball mill brings a certain load on the equipment, and it will not take long to "heatstroke". If the ball mill is to maintain a long and stable ball milling operation, all mine owners must do a good job of cooling the ball mill in summer to prevent "heatstroke". So how exactly should we prevent it?
1. Strengthen the internal and external ventilation of the ball mill
According to the calculation of the heat balance of the ball mill, the heat taken away by the ventilation of the ball mill usually accounts for 20% of the total heat output of the ball mill. Enhancing ventilation can bring the outside cold air into the ball mill and dilute the heat molecules inside the ball mill, thereby gradually reducing the temperature inside the ball mill. If the ball mill equipment is to be well ventilated, the internal equipment of the ball mill must be reorganized and modified to facilitate ventilation and heat removal.
It should be noted that although strengthening the ventilation in the mill can reduce the temperature of the material, the ventilation in the mill is not only restricted by system resistance, air lock, air leakage and other factors, but also restricted by the fineness of the product. Excessive air volume will make the grinding effect worse. Therefore, there is a certain limit to reduce the temperature of the grinding material by increasing the ventilation in the ball mill.
2. Add water spray or refrigeration device
Generally, the grinding system has a large number of equipment and pipes, and the heat dissipation surface is relatively large. When the ball mill is working, it is also possible to spray water from the grinding head or the tail, but only when the temperature of the input abrasive is higher than 100 degrees, can the water be sprayed from the grinding head or the tail.
In addition, we can also install a refrigeration device for the ball mill to cool the abrasive material, and at the same time to cool the surface of the grinding equipment under high-temperature roasting. In this way, the temperature of the ball mill can be controlled in an ideal state, and preventive work can be done.
3. Improve the lubricity of the ball mill
We can add a suitable and sufficient amount of lubricating oil to each rotating bearing of the ball mill, which can prevent the friction and heating between the bearing components due to the lack of lubricating oil, thereby eliminating the problem of abnormal high temperature in the ball mill and alleviating the ball mill ' heatstroke' phenomenon.
Generally, when the ball mill is running, the temperature rise of the main bearing lubricating oil does not exceed 55°C, the temperature rise of the transmission bearing and reducer does not exceed 55°C, and the upper limit does not exceed 60°C. All lubricating oil should be discharged, cleaned and replaced with new oil when the ball mill is put into continuous operation for one month; the lubrication condition and oil level of each lubrication point of the ball mill should be checked at least every 4 hours.
4. Add grinding aid
In view of the high temperature of the grinding system, which causes serious over-grinding and the reduction of the grinding efficiency of the ball mill, we can use grinding aids to reduce the degree of adhesion in the ball mill, improve the grinding efficiency of the ball mill, and reduce the vicious cycle of high temperature.
If the ball mill is kept at high temperature for a long time without cooling measures, it is easy to reduce the grinding efficiency, shorten the service life, and increase the maintenance workload, which will not only cause damage to the ball mill itself, but also cause unqualified grinding products and reduced performance. Therefore, it is very necessary to do a good job of cooling the ball mill. The four methods we have introduced above have solved the problem of excessively high temperature of the ball mill in summer. If you have any other questions, please consult us.