| 摘要 |
Apparatus for joining of plastic tubes, wherein two tubes (22) have chamfered ends which provided a grove for depositing of a joining welding seam (25), means being provided for maintaining the tube ends in place during the welding operation. It comprises an annular collar (11) provided for being mounted around two tubes ends (22). Said annular collard being dividable for being removed from a welded tube, and carries at least three double wheels, at least one of which is a driving wheel (21) for carrying the annular collar (11) aournd the assembly of two tube ends (22). On the collar (11) at least one assembly (33, 34) with a welding head (39) supplying welding material is provided. Inside the tube ends at the joint, means (Fig. 4-8) being provided with radially expandable pressure jaws to keep the tube ends together and provide a circular shape. It is also provided a particular device to hold the tube ends (22) during welding. It has three clamping bars (51-53) connected with an expanding means (54, 55, 60). The clamping bars are provided to cover the inside of the tube ends substantially completely, with an outer diameter corresponding to the nominal inner diameter of the tube. |
