| 摘要 |
PROBLEM TO BE SOLVED: To provide a dust collection apparatus improving the non-efficiency of the full operation of a dust collector at the time of fluctuations of the number of buffing plates to be used, the scattering contamination of buff powder due to the drawer system of a buff powder recovery container and the recovery of a noble metal in a suction duct. SOLUTION: A suction duct 4 is connected to the respective hoods of a plurality of buffing plates 1 arranged in a work chamber 16 through respective shutters in common and a noble metal taking-out opening is provided in the suction duct and the dust collector 5 is connected to the other end opening of the suction duct in the dust collector chamber 17 demarcated from the work chamber and air from the dust collector is passed through an air cleaner 20 having a filter and a deodorizing and removing means. A part of clean air from the air cleaner is returned into the work chamber and the remainder thereof is discharged to the outside and the heat exchange of the air introduced into the work chamber from the open air with discharged air is performed by a heat exchanger 24. The pressure in the suction duct connected to the dust collector is detected and the number of rotations of the blower of the dust collector is controlled to keep the pressure in the suction duct constant. The region between the cylindrical container of the dust collector and the buff powder receiving bag from the filter of the dust collector mounted in the container is held to negative pressure.
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