Noise control and noise reduction measures for mineral powder mill noise control, first of all, we should analyze the main noise sources of mineral powder mill (gear drive system) and the factors affecting it, and take different methods to control it for different situations.

1, try to eliminate the "design noise"

Through the comparison and analysis of the noise spectrum under different working conditions of the mineral mill, it can be seen that: the appearance of the peak noise sound pressure level, are in the gear drive impact frequency and the system's intrinsic frequency (gear mesh frequency) of the second and third harmonic frequency is equal to or close to the region, this is due to the generation of resonance, amplitude surge caused by the. The peaks appear in regular periodic intervals. But because of the high frequency of the peaks, often overlooked, in fact, the mill noise is the synthesis of these different peaks in the high-frequency band. To avoid the appearance of these peaks, we should try to change the movement parameters, avoid resonance, eliminate this kind of non-component manufacturing and installation quality and noise.

2, improve gear manufacturing accuracy

The reason why the gear system noise, the reason is that the gears in the mesh, the gears between the impact and vibration, through the medium of energy conversion, the formation of sound, noise. Its occurrence (sound pressure level) and amplitude size, frequency characteristics and the inherent vibration frequency characteristics of the system. The direct way to reduce noise is to take measures against the noise source to suppress the impact to a low limit. Mill in the work, a pair of engaged gears, the center distance to be adjusted with the roller rolling distance and change, and the slave gear inevitably produce speed fluctuations, the emergence of instantaneous acceleration of the movement, resulting in impact. To reduce noise, we must reduce the impact, improve the smoothness of the gear meshing movement.

3, improve gear processing accuracy

In the processing of gears, we have prepared a strict procedure. At the same time, under the condition of not affecting the strength of the gear, with better toughness of the material.

4、Improve the balance precision of the two rollers of the grinding machine.

According to the use of grinding equipment, gear load changes are not large, and thus the impact on the noise is not large. However, the dynamic balance of the grinding rollers often do not attract enough attention. Due to the unevenness of the quality of the roller body, the surface of the roller body on the two shaft diameter of the runout deviation and the two shaft diameter of the coaxiality deviation of the existence of the rollers, the movement of the grinding rollers, inevitably caused by the quality of the rotary center and the movement of the rotary center of the non-coincidence of unbalance, resulting in dynamic unbalance, the formation of cyclical vibration impacts. The unbalanced moment of inertia, through the rigid shaft caused by the gear cyclic impact dynamic load, so that the gear noise increases. Therefore, we can improve the quality requirements of the roller body to ensure smooth movement of the roller body, reduce inertia impact, the roller body running unbalance tolerance control in the specified value.

5, improve the installation accuracy of the roller

Due to manufacturing or installation reasons, stone grinding equipment, fast and slow roller axis line will produce relative tilt. In addition, gear and journal clearance is too large, easy to produce eccentricity, so that the center of rotation is not consistent, gear tooth meshing will occur in the movement of interference, so that the gear generates additional dynamic loads. In the cyclical changes in the additional dynamic load, the gear to the same impact on the movement. As the gear is mounted on the roller shaft, the impact frequency and gear meshing frequency, roller body dynamic unbalance impact frequency is basically the same. As a result of the superposition of impacts, the gear noise shows periodic sound pressure level peaks. In order to control the noise, we strictly control the impact of this installation error. Improve the parallelism of the axis of the two rollers, and maintained in motion.

6, the implementation of the standardization of operating procedures

Control of milling equipment to use the environmental conditions of the mill's main processing object is wheat and other materials with similar particles. Mill noise indicators of the factors affecting the machine itself, in addition to the factors affecting the machine itself, but also includes operating methods, into the grinding material characteristics, environmental conditions and other factors. Therefore, the implementation of the standardization of operating procedures, is one of the effective measures to reduce noise.

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