| 摘要 |
The shielding device includes a movable shield (2) with a bore (5), coaxial with respect to the blast tube (1) of the detonation system, an annular bellows (3) and a fixed plate (4) with a bore (6). The bellows (3) and the bore (6) are arranged coaxially with the bore (5) in the shield (2). The bellows (3) is connected at its one end face to the shield (2) and at the other end face to the plate (4). In the latter there are nozzles (8) around the bore (6) which are in connection with the hollow space (9) of the bellows (3), and a short feed pipe (11) is provided for feeding gas into the hollow space (9) of the bellows (3). <IMAGE> |
