Cone-shaped dry concrete mixer sources analysis

Our concrete mixers and frequency characteristics analysis of noise, when concrete mixer on material system sand, gravel, cement, according to a certain proportion of water into the Blender when you coning mixing Drum mixing, gravel, sand and between between the cylinder wall friction, impact, sparking wall a large area of stirring noise and vibration. Large vibration not only radiation of low frequency noise radiation of high frequency noise, mixer noise impact around 95dB (a). When stones, sand and water into the mixing Drum when starting stirring, noise largest cement and slight decrease in noise. In the transmission of power on the other hand, between the belt and pulley, gear in between rolling process and unbalance friction of sliding contact surfaces in the process noise about 87dB (a). The above mechanical noise generated by the solid vibration, is the main noise source mixer. The motor noise is relatively small, around 85dB (a). Mixers are usually open-air installation, the device does not have any insulation, noise reduction measures, noise spreading outward as far as hundreds of metres away. While Sun and rain can lead to transmission parts rust or lack of lubrication or mechanical noise. Measurements show that noise at 1 m distance a blender around 95dB (a); 10 metres away from sound source noise of 87dB for sound source 30 metres away 79dB (a).