How to reduce the high temperature performance of ball mill?
Date：2019-09-29 16:56 Source：cementepcViews:
Due to the impact of grinding minerals, mechanical friction energy of grinding materials and the energy released when the materials are broken, it is easy to make the temperature of the ball mill too high, plus summer high temperature weather, the working environment is even as high as 40 or 50 degrees.In this way, the ball mill in high temperature for a long time on the equipment as a whole brought a certain negative bearing, it will not be long before the fault.If the ball mill to maintain a long time stable ball mill operation, the mine owners must do a good job of ball mill cooling work in summer, in case of failure, ball mill high temperature performance reduction how to solve let me take you to understand.
1. Strengthen the ventilation of the inside and outside of the ball mill
According to the heat balance of the ball mill, the cooling air volume of the ball mill can be said to be the simplest method.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 discharged by the ball mill.Strengthen ventilation can bring the outside cool air into the inside of the ball mill, dilute the heat molecules inside the ball mill, thus gradually reducing the temperature inside the ball mill, and if you want to be able to carry out good ventilation, it is necessary to reorganize the device inside the ball mill, so as to ventilate heat.
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 the factors such as system resistance, air lock and air leakage, but also restricted by the product fineness. Excessive air volume will make the grinding effect of the ball mill worse.Therefore, there is a certain limit to reduce the temperature of the grinding material by increasing the ventilation in the grinding of the ball mill.
2. Devices that increase the effect of water spraying or cooling
In general, grinding system has a large number of equipment and pipes, heat dissipation surface.We can make full use of the surface of the grinding system to strengthen cooling and heat dissipation, such as spraying atomized water to the outer wall of the separator, and doing the tank along the outer side of the screw conveyor.When the ball mill is working, it is also feasible to spray water from the head or tail of the mill, but only when the temperature of the input abrasive is higher than 100℃ can water be sprayed from the feed end of the ball mill, or spray water downstream.In addition, we also can install have effect of refrigeration device for ball mill, grinding material for cooling, at the same time for the grinding equipment under high temperature burning surface cooling, such combination, can control the temperature of ball mill in the ideal state, is ready for grinding equipment "heat stroke prevention work.
3. Improve the lubricity of the ball mill
We can add suitable and sufficient amount of lubricating oil to each rotating bearing of the ball mill, so as to prevent the friction heat phenomenon between bearing parts due to less lubricating oil, thus eliminating the problem of abnormal high temperature of the ball mill and relieving the phenomenon of "heat stroke" of the ball mill.
Generally, when the ball mill is running, the temperature rise of the main bearing lubricating oil shall not exceed 55℃, the temperature rise of the transmission bearing and reducer shall not exceed 55℃, and the maximum temperature rise shall not exceed 60℃.All lubricating oil should be released when the ball mill is put into continuous operation for one month, thoroughly cleaned, and replaced with new oil. After combined with medium repair, oil should be changed about every 6 months.Check the lubrication condition and oil level of each lubrication point of the ball mill at least every 4 hours.
4. Add grinding aid
In view of the problems of high temperature in the grinding system, serious over-grinding phenomenon and decreased grinding efficiency of the ball mill, we can reduce the adhesion degree of the ball mill by using grinding AIDS, improve the grinding efficiency of the ball mill, and reduce the vicious circle of high temperature.
If the ball mill does not take cooling measures under high temperature for a long time, it is extremely 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 necessary to do a good job of cooling the ball mill.