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南京某机器制造厂有一台高频熔炼炉,熔炼铜合金。在未采取屏蔽措施前,熔炼炉工人操作带的电场强度高达380V/m,磁场强度8A/m,分别超过国家暂行标准18倍和0.6倍(国家暂行标准为,电场强度:20V/m; 磁场强度:5A/m)。现设计、安装了钟罩式屏蔽体,使电场强度下降到15V/m;磁场强度0.4A/m,均低于国家暂行标准。取得了较理想的屏蔽效果。一、钟罩式屏蔽体的特点高频熔炼炉熔炼时,要求操作工人经常搅拌熔
A machine factory in Nanjing has a high-frequency melting furnace, melting copper alloy. Before the shielding measures were taken, the electric field strength of the operating zone of the smelting furnace was as high as 380V / m and the magnetic field intensity was 8A / m, which respectively exceeded the national interim standards by 18 times and 0.6 times respectively (National Interim Standard: electric field intensity: 20V / m; Intensity: 5A / m). Now designed and installed bell-type shield, so that the electric field strength dropped to 15V / m; magnetic field strength 0.4A / m, are lower than the national interim standards. Achieved a better shielding effect. First, the characteristics of bell-type shield High-frequency melting furnace smelting, the operating requirements of workers often stir melting