One of the most important aspects of environmental protection is to control noise pollution. Noise pollution is a common problem in the machinery industry. The noise of concrete mixer trucks are composed of mechanical noise and motor noise.
When the feeding system of the mixer feeds the stones, sand, cement and water into the conical mixing drum of the mixer in a certain proportion for mixing, the sand and stones and between the sand and the wall of the drum rub and collide with each other, causing a large area of the drum wall. Vibrates and produces stirring noise. The vibration of a large area radiates not only low-frequency noise but also high-frequency noise, and the impact noise of the mixer is about 95).
When stones, sand and water enter the mixing drum and start mixing, the noise is loud, and the noise decreases slightly when cement is added. On the other hand, in the transmission of power, the noise generated by the unbalanced friction of the contact surface between the belt and the pulley and between the gears during the rolling process and sliding process is about 87).
The above-mentioned mechanical noise generated by solid vibration is the main noise source of the mixer. Its motor noise is relatively small, about 85). Concrete mixers are usually installed in the open air. The equipment does not have any sound insulation and noise reduction measures, and its noise spreads out as far as 100 meters away. At the same time, the sun and rain will cause the transmission parts to corrode or lack of lubrication, which will also aggravate the mechanical noise. These numerous noise-generating factors need to be addressed urgently.
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