Occupational hazards in machinery industry

mechanical manufacturing is an old and young discipline, which is the foundation of various industries. The level of machinery manufacturing is an important symbol of the level of industrialization and development of a country. Machinery manufacturing industry involves a wide range of industrial workers. According to incomplete statistics, there are about 1.5-2 million workers engaged in machinery manufacturing industry in China. The basic production process is casting, forging, heat treatment, machining and assembly. So, what occupational hazards exist in the machinery manufacturing industry? The scope of machinery manufacturing industry is very wide, including the manufacturing of transportation tools, machine tools, agricultural machinery, textile machinery, power machinery and precision instruments. Generally, there are casting, forging, heat treatment, machining and assembly workshops. The types of work are mixed, but the occupational hazards are roughly the same< Casting: can be divided into manual and mechanical modeling. Manual molding refers to the process of manual completion of sand tightening, mold stripping, trimming and box closing. With high labor intensity, workers are directly exposed to dust, chemical poisons and physical factors, causing great occupational hazards. Case 1 occurred in this production environment. The productivity of mechanical molding is high, the quality is stable, the labor intensity of workers is low, the chances of workers contacting with dust, chemical poisons and physical factors are less, and the occupational hazards are relatively small 1. Dust hazard: a large amount of sand dust is produced during molding, casting sand falling and cleaning, in which the nature and hazard of dust are mainly determined by the type of molding sand. For example, when quartz sand is used for molding, it is most harmful because of the high content of free silica. 1n 2005, according to our detection of dust concentration in the workplace of the molding workshop of a machinery factory, the results were 27.5-62.3mg/m3, with an average of 39.5 mg / m3

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