| 摘要 |
<p>A heating device, particularly useful for heating the end portions of hollow elongated objects such as thermoplastic hose or tubing, comprises an enclosure for substantially surrounding the end portion of the object, means for substantially immobilizing the end portion within the enclosure and means for directing a stream of heated gas around the inside and outside of the object along the length of the end portion. In a preferred embodiment, the enclosure is an insulated metal circular cylinder having at one end apertures for receiving thermoplastic hose and controlling gas flow. At the other end, the enclosure has an apertured conical member for insertion into the hose to immobilize it in axial alignment with the cylinder. A gas flow conduit for introducing, stream of heated air substantially tangentially onto the inner and outer surfaces of the hose cooperates with the walls of the hose and the enclosure to whirl hot air helically around the inner and outer surfaces of the hose along the length of the end portion.</p> |
