Lifting height and motion trail of projectile action of ore grinding medium depend on rotating speed of grinding machine and the filled amount of ore grinding medium. Both the low speed and high speed will have direct influence on the performance of grinding machine. The grinding medium moving condition in three kinds of different working speed are:
1. Grinding machine running in a low speed(pic.a)
The rotating speed is not high so the lifting height of grinding medium is low and the grinding medium will fall to the bottom of barrel along to their own inclined plane for circulating. The medium is in spilling state and has smaller impact. The abrasive and extrusion action are formed by rolling action among mediums. Ball has less grinding action to materials.
2£®Grinding machine running in a normal speed(pic.b)
The rotating speed is higher so the lifting height of grinding medium is high and the grinding medium will be up to a certain height with barrel circular motion, then leave the barrel in a certain velocity and do fall down movement along parabolic path. At this time, the grinding medium has high impact and the abrasive and extrusion action will get sufficient exertion. The materials are ground in the most intense level. Most of grinding machines are working in such a ore grinding condition.
3. Centrifugal operation(pic.c)
When the rotating speed of ore grinding machine is enhanced to a limit numerical value, all the grinding medium will do concentric rotation with the barrel and will not fall down, which will be called centrifugal operation. When the medium produces centrifugal operation, the ore grinding action will be lost in theory. So the grinding machine should work in the rotation speed which is below centrifugal operation. Get rotary kiln,ball mill,ball mill
To summarize, the lifting height and motion trail of the projectile action of ore grinding medium depend on the rotating speed of the grinding machine and the amount of ore grinding medium filled. Here is an explanation of the three different working speeds and their effect on the grinding medium:
1. Low Speed: In this mode of operation (pic.a), the rotating speed of the grinding machine is not high. As a result, the lifting height of the grinding medium is low, causing the medium to fall to the bottom of the barrel along its own inclined plane. The medium is in a spilling state, meaning it has smaller impact. The grinding action is mainly formed by the rolling action among the mediums, resulting in less grinding action on the materials.
2. Normal Speed: When the grinding machine is running at a normal speed (pic.b), the rotating speed is higher, leading to a higher lifting height of the grinding medium. The grinding medium is lifted to a certain height with the barrel's circular motion and then leaves the barrel with a certain velocity, falling down along a parabolic path. At this speed, the grinding medium has a high impact, and the abrasive and extrusion action get sufficient exertion. This is the most intense level of grinding, and most grinding machines operate under these conditions.
3. Centrifugal Operation: When the rotating speed of the grinding machine is increased to a limit numerical value (pic.c), the grinding medium will undergo concentric rotation with the barrel and will not fall down. This is known as centrifugal operation. In theory, when the medium produces centrifugal operation, the ore grinding action is lost. Therefore, the grinding machine should operate at a rotation speed below the centrifugal operation speed to ensure effective grinding.
In summary, to achieve optimal grinding performance, the rotating speed of the grinding machine should be adjusted based on the specific requirements of the ore grinding process. When operated at the correct speed, the grinding medium can create the desired impact and abrasive action to effectively grind the materials.