| 摘要 |
A sealing head 2 for a pressurized treatment tube 1, such as a vulcanizing tube, for a cable 3 or similar elongated product comprises a housing 4 for fastening to the tube 1 and containing two flexible seals 6, 7 mounted in tandem in the direction of movement of the cable through central openings 8 in said seals. The housing defines chambers 10, 11 surrounding the seals 6, 7 and connected separately to a pressure medium source 17 whereby the openings 8 are adjustable in size by adjusting independently the pressures in the chambers and hence varying the radial compression force F. Thus the head 2 seals both against the pull rope for the cable and the coated cable so that the treatment tube may be pressurized at the very beginning of the treatment of the cable. An annular space 18 between the seals is adjustably connected to a second pressure medium supply, e.g. the interior of the treatment tube to provide a further seal. <IMAGE> |
