Noise spectrum characteristics in workplaces of stone processing industry in Shenzhen

  Objective  To analyze the noise spectrum characteristics in workplaces of stone processing industry in Shenzhen, and provide scientific basis for noise control and prevention.

  Methods  By using the method of judgment sampling, a total of 38 stone processing enterprises were studied, the noise intensity was measured, and the noise spectrum characteristics of different positions were analyzed by cluster analysis.

  Results  In stone processing industry, totally 14 typical operation ways (job titles) were differentiated, and the average equivalent sound pressure level of 10 out of these 14 job titles exceeds 85 dB(A), and the maximum noise level in hole-opening post was 104.4 dB(A). The results of cluster analysis showed that the noise spectrum characteristics in fixed-thickness, blowing-suction air drying and hole-opening posts were similar, and the noise intensity was higher in all (from low to high) frequency. The noise spectrum characteristics in chamfering, profiling, polishing, bridge cutting, edge cutting, dry grinding, hand grinding and wet grinding were similar, and high frequency noise was the main noise. The noise spectrum characteristics in machine edge grinding, wire-saw and water-jet cutting were similar, and the noise intensity was lower than 80 dB(A).

  Conclusions  The noise hazard in stone processing industry was serious, and effective engineering control measures and hearing protection measures should be taken according to the spectrum characteristics of noise.