Ball Mill Noise Control in Cement Grinding Process
Ball mill is a kind of grinding equipment in mining field and cement plant.It can grind hard stones and materials not greater than 320 MPa, such as mineral powder production lines, cement production lines and other grinding equipment supporting applications. Is there any way to eliminate noise?
Ball Mill Working Principle and Noise
Ball mill is mainly composed of ball mill rollers, gears, bearings, transmissions and motors. It consists of a hollow shaft and a grinding head for feeding and discharging. The cylinder is a long cylinder. It contains a grinding body which is made of steel. Inside the steel cylinder is ball mill liner. And according to different diameters and a certain proportion into barrel, grinding body can also use steel sections. When ball mill is running, gears, parts like bearings, transmissions and motors make noise, but these noise sources are different, so are the primary and secondary positions of sound sources.
Sound source analysis and measurement of intermittent ball mill unit shows that large tanks are main noise sources; gears, bearings, transmissions of sand production lines and motors are relatively minor sound sources. Because of the friction between steel ball and cylinder, when cylinder rotates, steel ball is lifted and raised to a certain height. Gravity of steel ball, it finally makes noise along a certain track. From the perspective of sound power, sound power radiated by large tank is dominant, while sound power radiated by other parts is significantly lower, which is more than an order of magnitude.
The noise of intermittent ball mill is mainly caused by collision and grinding of steel balls, materials and liners. This kind of noise is mechanical noise, and it radiates outward from tank surface. The same type of energy-saving ball mill and sand production line, when there is a difference in crushed materials or amount of feed, noise generated during operation will also vary greatly.