| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a blower dust collector capable of performing efficient ventilation while reducing the number of apparatuses for air blowing and dust collection and power required for an operation of the apparatuses as much as possible, in construction of a tunnel where powder dust is generated from a working face side.SOLUTION: A blower dust collector is configured by: an air intake port 3; a blower 2; and two flow passages A, B for connecting these. The flow passage A includes a dust collector 4 having a filter 41 in the middle of it, and the flow passage B includes a balloon type damper 5 which can freely close the flow passage in the middle of it. When a powder dust amount contained in the air flowing in from the air intake port 3 exceeds a threshold value, it is controlled so that the balloon type damper 5 expands and closes the flow passage B and the air passes only through the flow passage A. When the powder dust amount contained in the air flowing in from the air intake port is equal to or less than the threshold value, it is controlled so that the balloon type damper shrinks and the flow passage B is released, and the air passes through both the flow passage A and the flow passage B.</p> |
