Ball mill noise control

r.>Ball mill noise control adopts engineering technical measures to control the noise output generated by the ball mill when crushing materials. Controlling the propagation and reception of noise to obtain the acoustic environment required by people is ball mill noise control. The ball mill can produce strong vibration and noise when crushing materials, which can cause great harm to operators and the surrounding environment.
.>There are three main noise sources and influencing factors in ball mill noise control:
.>) The noise of the ball mill is mainly the mechanical noise caused by the collision between the metal balls in the drum and the drum wall lining and the materials being processed. This sound radiates outward along the lining plate, cylinder wall, and inlet and outlet, including: the impact sound between steel balls, steel balls and lining steel plates, and the impact sound and friction sound of materials. Others include the noise caused by the vibration of the transmission mechanism (reduction box and motor) when the equipment is running.
.>) The size of the ball mill noise is related to the diameter and speed of the ball mill as well as the nature and lumpiness of the material.
.>) The noise of the ball mill is basically a steady-state noise with a wide frequency band and low sound energy. The sound energy of the medium and high frequency components is very high. The larger the diameter, the stronger the low frequency component.
.>The following five basic measures are taken to control the noise of ball mills:
.>Increase the sound insulation cover. A steel structure skeleton is used, a thin steel plate is used as the outer shell, a damping layer is applied, and ultra-fine glass wool or other sound-absorbing materials are filled to seal the entire ball mill. Since the ball mill generates a large amount of heat during operation, attention must be paid to heat dissipation within the cover and to facilitate equipment maintenance.
.>Replacing the manganese steel lining with a rubber lining can reduce the noise level and the spectrum characteristics also change from high frequency to low frequency.
.>Set the elastic layer. A heat-resistant soft rubber pad is laid between the inner surface of the ball mill drum and the lining plate. In order to prevent the soft rubber pad from overheating, industrial felt with a thickness of 1 is laid between the ball mill lining plate and the soft rubber pad, which can reduce the noise of the ball mill to the allowable standard. the following.
.>Wrap the drum wall with a sound insulation layer. The ball mill drum wall is wrapped with a thick layer of industrial felt and a thick steel plate is used as a protective surface. Use bolts to fix it to the outer wall of the drum. The actual sound insulation value is about d. If the two ends of the drum are treated in the same way and the joints of the drum wall are well sealed and the sound insulation effect is improved, the sound insulation effect may be improved.
.>Design soundproof rooms. When conditions permit, it will be better to concentrate the ball mills in a special ball mill room and transform the ball mill room into a special sound insulation room than a sound insulation cover. However, attention must be paid to the monitoring, indoor heat dissipation and maintenance problems during the operation of the ball mill.
.>Most of the ball mills in the mineral processing plant are connected to the classifier. Multiple ball mills and classifiers are located in parallel. The workshop where the ball mill is located is generally relatively far away from other workshops, offices and other places that are sensitive to noise and vibration. Therefore, the ideal method is to establish a Workers in the sound-insulated and anti-vibration operation room perform remote operations and instrument monitoring in the ball mill control room and conduct regular outdoor inspections to reduce the time workers are exposed to strong noise and vibration (personal anti-noise ear protectors and anti-vibration shoes are also issued).