| 摘要 |
The lower end (17) of the lifting tube (6) is rotatable in relation to the suspension device (2) and is provided with one or more suction bowls (17). The vacuum pump (7) is arranged inside the lifting tube (6) with its suction side (8) communicating with the lifting tube interior and its pressure side (9) communicating with the lifting device (3) exterior. The vacuum pump together with the lifting tube is rotatably connected with the suspension device, in which a feeder conduit (13) for driving the vacuum pump is fixed and connected to the vacuum pump by a rotatable coupling arrangement (14). The vacuum pump is a vacuum ejector fed by a compressed air conduit. A one-way valve (11) is arranged on the suction side (8) of the vacuum pump (7). |
