为消除铸字铅尘,我厂使用了4-72-11型5号离心式通用通风机,安装在四楼风机房内。由于振动剧烈,噪声很大,为此,我们采取了消声、隔声、阻尼、减振的综合措施,如图1。采取措施后测定,机房附近噪声显著降低,厂办公楼由80分贝降到47分贝(A);排字车间由70分贝降到58分贝(A),排字工人 In order to eliminate casting lead dust, our factory used 4-72-11 type 5 centrifugal universal ventilator, installed in the fourth floor of the fan room. Due to the violent vibration and loud noise, we adopted the comprehensive measures of noise attenuation, sound insulation, damping and vibration damping as shown in Figure 1. After measures were taken, the noise in the vicinity of the engine room was significantly reduced, the factory building was reduced from 80 dB to 47 dB (A); the typesetting workshop was reduced from 70 dB to 58 dB (A)