Identification and control of occupational hazard factors in a machine tool manufacturing enterprise in Shaanxi Province
Objective To identify the occupational hazards of a machine tool manufacturing enterprise in Shaanxi Province,identify the key control pointsand propose control measures.Methods Qualitative and quantitative analysis of oc-cupational disease hazards in the manufacturing enterprise were carried out by field investigation and detection.Results The main occupational hazards of the enterprise were welding dust,grinding wheel dust,other dust(metal dust,plastic dust),hydrochloric acid,sulfuric acid,phosphoric acid,sodium hydroxide,zinc oxide,benzene,toluene,xylene,nitro-gen oxide,ozone,carbon monoxide,noise,ultraviolet radiation,etc.The test results showed that the peak exposure con-centrations of dust in spraying and welding positions were 22.0 mg/m3 and 9.5 mg/m3,nearly 3 times PC-TWA.The time-weighted average concentrations of dust in spraying and welding positions were13.2 mg/m3 and 4.1 mg/m3,and the noise intensity of spraying and spraying positions in painting workshop was 96.3 dB(A)and 89.7 dB(A).The test results excee-ded the standards.The mixed contact ratio of benzene,toluene and xylene in painting position exceeded the standards.The test results of occupational hazard factors in other positions were in line with the occupational exposure limits.Conclusion Spray painting,spray plastic and electric welding are the key control points of occupational hazards.It is suggested to add dustproof,anti-gas and anti-noise facilities to positions that exceed the standards,strengthen personal protection,and pro-tect the health of workers.
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