Noise analysis of concrete mixing station

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The concrete mixing station is mainly composed of five main systems such as agitation host, material weighing system, material conveying system, material storage system and control system and other ancillary facilities. Analysis of the operation noise of cement mixers is required to deal with the sound of cement mixing equipment. Clear how this sound is formed.
Recognize and analyze the working status of cement mixing equipment and find out that the noise of mixing is focused on the sound of sand and metal colliding with metal, the sound of friction, the shivering sound of the mixing drum, the sound of the material inside the mixing drum, the sound of the material inside the mixing drum, and the mixing equipment started by the internal combustion equipment and the internal combustion equipment. There is noise emitted by the motor when the electric equipment starts up.

If the material in the mixing drum falls down when it is running high, the sound is most intense. In addition, the impact of sandstone and gravel will also have a great impact sound, and these two collision sounds are the key part of the noise emitted by the cement mixing equipment during its work.
The large gear meshing clearance is due to the fact that the ring gear installed on the mixing drum shell is a cast tooth shape, and the installation error on the cylinder body is too large. Only by properly increasing the meshing gap can the card caused by tooth shape error and installation error be avoided. Tooth phenomenon. This pair of gears is a spur gear with a small overlap coefficient, resulting in poor smoothness of the transmission.
The large meshing gap, the small overlap coefficient, and the unbalanced loading of the mixer drum lead to increased gear transmission noise. This is mainly manifested as the flank impact sound and sometimes the tooth surface slip.

The mixing drum is supported by four idler rollers. The accuracy of the axis of the large gear ring outside the drum is determined by the accuracy of the four idler devices. Deviations occur in the four idlers, and the resultant total deviation will be large, so the precision of the mixing drum and the gear ring device is low. The precision of the mixing drum device is low, resulting in poor rolling contact conditions, and the sliding of the relatively loose idler and the mixing drum supporting surface occurs. There are also four idler rollers that must maintain the best shape. If there is a shortage, there will be slippage between the idlers of the mixing drum and the bearings. The inconsistency of running unstable mixing drums and idlers will surely create large sliding noise.
Internal combustion equipment or motor noise are power machine noises. Internal combustion equipment emits much higher noise than electric equipment. The use of internal combustion equipment is particularly noisy, and this noise is caused by the condition of the power equipment itself.

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