Mine equipment operation is excessive noise will not only cause serious noise pollution to the work environment, but also will jeopardize the health of the operators. Red Star Machine Experts stated that it is very important to find solutions to excessive noise. This article takes the ball mill equipment in the beneficiation equipment as an example for analysis.
The noise of the ball mill is mainly the mechanical noise caused by the collision between the metal ball in the drum and the wall lining of the cylinder and the material being processed. The sound radiates outward along the liner, the wall of the cylinder, and the inlet and outlet. Including the collision sound between the steel ball and the steel ball, the steel ball and the lining steel plate, the impact sound of the material, the friction sound; In addition, the vibration of the transmission mechanism (gearbox and motor) also emits noise.
Option One: Replace rubber plate with rubber liner
The use of special wear-resistant rubber liners instead of manganese steel liners has two functions: to reduce the straight sound generated by the steel balls directly hitting the liner, and to reduce the vibration of the vibration source; to isolate the transmission of vibrations to Simplified, to reduce Simplified Stimuli Vibrating sound radiation ball mill. The use of rubber liners can actually reduce noise by 10 to 15 dB.
Option 2: Padded elastic layer under the liner
A heat-resistant soft rubber pad is laid between the inner surface of the ball mill roller and the liner. To prevent the soft rubber pad from overheating, an industrial felt with a thickness of 10-15 mm is laid between the ball mill liner and the soft rubber pad. The ball mill can be used. The ball mill noise is reduced below the allowable standard.
Option 3: Add acoustic enclosures
The steel structure is used. The ball mill uses a thin steel plate as the outer shell, and the inner damping layer is filled with superfine glass wool or other sound-absorbing materials to seal the entire ball mill. Due to the large amount of heat generated during the operation of the ball mill, the ball mill must pay attention to the heat dissipation inside the hood and facilitate the maintenance of the equipment.
Option four: damping sound insulation
The use of viscoelastic damping materials to reduce ball mill noise is the use of viscous hysteresis in the transition of the damping material from the glassy state to the rubbery state; it does not change any equipment and operating parameters of the ball mill; it has good maintenance performance and is easy to install and disassemble.
Option 5: Design soundproof rooms
When the conditions permit, the ball mill will be centralized in a special ball mill room, and the ball mill room will be transformed into a special sound insulation room. The effect will be better than the sound insulation cover, but attention must be paid to the problems of ball mill operation monitoring, indoor heat dissipation and maintenance.
Option 6: Enclosure sound insulation layer on drum wall
A 50mm-thick industrial felt was overwrapped on the wall of the ball mill drum, and a 1mm thick steel plate was used as a protective surface and bolted to the outer wall of the drum. The actual sound insulation value was about 12dB (A). If the rollers are also treated at both ends of the drum, the seals at the drum wall are well sealed and the sound insulation may be improved.
