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How to Get the Optimum Rotary Rate of Ball Mill

During the running process of ball mill, rotary rate is an important working parameter because proper rotary rate can improve the working efficiency of the grinding mill. Low rotary rate will influence its working capacity, and high rotary rate may aggravate the abrasion of the spare parts and reduce the working efficiency of the grinding mill. For this reason, it is necessary to choose the optimum rotary rate for ball mill.

The means of getting the optimum rotary rate of ball mill: during the falling process of the steel balls, the kinetic energy of the drop point will perform the crushing function and the radial kinetic energy will mainly perform the crushing function, so that the rotary rate that is got aiming for the maximum aggregate-value of the radial kinetic energy factors of all ball layers is the optimum.

An analysis of the kinetic energy and the kinetic energy factors of the steel balls during the falling process: The total kinetic energy of the drop point of the steel balls can be divided into radial kinetic energy and tangential kinetic energy. The radial kinetic energy is the main energy to impact and crush the rocks, and the tangential kinetic energy mainly performs the function of grinding in the relative movement. Divide the moving steel balls into n layers, and the arbitrary lay is i, the outermost layer is the first layer and Ri represents the radius of the arbitrary ball layer. According to the linear speed and the critical speed of rotation of the steels at any layer and the radial kinetic energy and the tangential kinetic energy of the drop point of the steel balls, get the total kinetic energy, radial kinetic energy and tangential kinetic energy of the drop point of the steel balls at any layer in the falling process. Then calculate the loading rate of the steel balls at different rotation rate, and accumulate the numerical value of all the ball layers and get accumulated value of the radial kinetic factors and the accumulated value of the total kinetic energy factors.

The rock crushing effect of the ball mill is determined by the kinetic energy of the drop point of the steel balls in the falling process, and the radial kinetic energy of the drop point plays the main part. For this reason, the accumulated value of the radial kinetic energy of all ball layers should be the basis of measuring the rotation rate of ball mill.

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