| 摘要 |
<p>An air cannon (11) is provided with an air cannon body (15) having a cylindrical body (14a) partitioning an air chamber (17) and an end plate (14b) provided at the cylindrical body (14a), and compression means (16) that are provided at the air cannon body (15) and reduces a volume of the air chamber (15). In the air cannon (11), an ejection port (18) having an inner-side opening end (18a) and an outer-side opening end (18b) that is larger than the inner-side opening end (18a) is formed in the end plate (14b). The air inside the air chamber (17) is ejected as air vortices from the ejection port (18) by driving the compression means (16).</p> |
