| 摘要 |
PURPOSE:To sample surely powdered dust, by attaching a tape-shaped filter paper to a cylindrical holder provided in a direction of the circumference of a circle of an inflow opening of air and arranging a suction nozzle for sucking the air to the inner part of the holder through the inflow opening being capable of shifting its place relatively to the direction of the circumference of a circle. CONSTITUTION:A cylindrical holder 12 provided with an inflow opening 14 of air in a direction of the circumference of a circle is attached to a collector 10 at the upper end of an interior cylinder 11 provided to the inside of a supporting cylinder 5 on the same shaft and a wire net 13 is stretched on the opening 14 of this holder 12 and also, a tape-shaped filter paper 15 is wound around with a weight ring 16 and moreover, a suction nozzle 17 is provided freely rotatably to the inside of the holer 12 opposite to said opening 14. The atmosphere containing powdered dust is flowed into a collecting room 6 through a cyclone 9 by operating a suction pump 24 and is sucked to the nozzle 17 passing through the filter paper 15 which is attached to the opening 14 of the holder 12. Then, coarse particles such as dust are removed by the cyclone 9 at the time of flowing into the room 6 and residual powdered dust is collected by the filter paper 15. At this time, the powdered dust is collected in beltlike on the filter paper by rotating continuously the nozzle 17 with a revolving shaft 21 by a driving source 22 and is collected in spotlike by rotating intermittently. |
