我厂为热加工单位,其中一个清砂车间1971年投产,工种有粗清、气割、喷砂、电焊、高车等,每年清理铸件1500～2500吨。该车间有8台喷丸机,其中3台是手工喷砂,5台是机械喷砂。全车间共有12个产尘点,通风不良,矽尘浓度高。1980年前共测矽尘19点次,最高276.4mg/m~3,最低1.9mg/m~3,平均33.3mg/m~3,合格率仅占10.5%。该车间接尘人员 I plant for the thermal processing unit, one of the sand cleaning workshop put into operation in 1971, a rough type of job, gas cutting, sandblasting, welding, cars, etc., an annual cleaning castings 1500 ~ 2500 tons. The workshop has 8 shot blasting machines, of which 3 are hand-blasting, 5 are mechanical sandblasting. The workshop has a total of 12 dust spots, poor ventilation, silica dust concentration. Before 1980, a total of 19 points of silica dust were detected, the highest 276.4mg / m ~ 3, the lowest 1.9mg / m ~ 3, an average of 33.3mg / m ~ 3, pass rate of only 10.5%. The workshop dust collector