| 摘要 |
The invention provides a mandrel sealing part for a hydraulic pipe expanding device which can increase the working performance and increase the durability of the device with a simple structure. The mandrel sealing part (1) seals the extra high pressure liquid supplied by the main body part and expands and molds the pipe piece from the internal surface inside a hydraulic pipe expanding device which connects a pipe board and a pipe piece which is inserted into a pipe hole positioned on the pipe board through an extra high pressure liquid under a state of being inserted into the pipe piece. The invention comprises a mandrel main body (2) a water pipe (3) and a water pipe cover (4). The mandrel main body (2) is connected with a pipe expanding tool and is conducted with the extra high pressureliquid. The water pipe (3) is arranged on the external periphery of the mandrel main body (2) so as to seal the extra high pressure liquid and expand the diameter. The water pipe cover (4) is coveredon the external periphery of the water pipe (3). |
