The noise pollution of home elevators is different from the general noise situation. It belongs to low-frequency noise pollution, accompanied by slight vibration pollution. The main transmission route is solid-state sound transmission, while the general noise is air as the sound transmission medium. Reinforced concrete slab is a high-density substance, low-frequency sound propagates in it, with fast speed and low attenuation. In view of the above characteristics, the following treatment measures are taken.
1. The original elevator main engine and the foundation of the power distribution cabinet are rigidly connected to the reinforced concrete of the building, which becomes the main transmission "sound bridge" of elevator noise. The original foundation was transformed into a composite broadband K-value (neck coefficient) vibration and noise reduction foundation to block the propagation path of low-frequency noise.
2. The electromagnetic radiation noise of the power distribution cabinet is also one of the strong pollution sources. The composite foundation with a lower excitation frequency of 1HZ is used for the foundation of the power distribution cabinet; the incoming and outgoing wires are treated with soft contact, and the rigid connection between the building and the floor is disconnected to form a "sound bridge" ", cut off electromagnetic low-frequency noise from the source.
3. If there is a noise problem caused by the friction of the main guide rail of the car and counterweight transmitted to the hoistway structure, use the elevator guide rail vibration and noise reduction device to reduce the structural sound transmission of this kind of hoistway.
Aiming at the analysis of elevator noise and vibration generation mechanism, transformation difficulties and maintenance convenience, a complete set of economical and effective damping spring composite shock absorption device and a unique combination of low-frequency sound insulation and noise reduction-elevator shock absorbers are used to ensure that the background is eliminated after treatment. Noise, after the renovation, the indoor acoustic environment of the household has reached the new national standard, and passed the inspection of the local special equipment inspection institute and the annual inspection of the maintenance department.
