By its nature, during the normal operation Vibrating screen only through vibration can achieved sieving, but the vibration is the root cause of the noise and the sound level is high, the sound sources are many and complex. How can we effectively reduce the noise of vibration screen?
Recently, after we conducted a noise test on vibrating screen in multi-point and multi-directional, we found that the noise spectrum shows broadband characteristics of the low-IF, the sound level also increases with the increases of frequency and amplitude. So, we have carried out research involved vibrating screen noise source analysis and noise reduction measures study.
1. First of all after we analysis the main noise source such as screen plate, side plate, vibration exciter bearings and steel springs and etc, therefore we propose the following noise reduction measures:
2. Fastened all parts on the vibrating screen, particularly the screen plate which replacement frequently, to avoid generated additional vibration due to the loosening of individual components;
3. Replace the punching steel screen plate to polyurethane screen plate with the advantage of small elastic modulus, low noise impact or rubber screen plate;
4. In the structure design of screen box you can use plenty of rubber and plastic component, besides you should consider the stiffness of the side plates, use appropriate stiffness to reduce vibration, thereby reducing low frequency noise waves.
5. Use rubber cloth wider spring to replace steel spring to reduce the impact;
6. Equipment the vibration exciter with soft acoustic cover;
7. Between the inner ring and outer bearing damping to be treated, the bearing rolling elements can be made into the hollow interior of the hollow rolling bodies or rolling elements added damping material, which can reduce the vibration and noise of bearing.
