| 摘要 |
The cutting head (24) is located at the end of the guide strap (15). In the circumferential working position, this strap covers 70 degrees or more of the weld bead (13, 14). A sliding unit (33) is included, with an at least 70 degrees angular offset from the cutting head. A manual traction lever (34) is fixed permanently to, or is detachable from, the guide strap (15). Preferred features: Angular offset between cutting head and sliding unit is 90 degrees or more; preferably 100 degrees -130 degrees . The sliding unit rests on the pipe surface on both sides of the weld bead, and comprises two rollers turning in bearings on the guide strap. The guide strap conforms with the curved pipe surface, being correspondingly curved, or suitably including a number of bends. To suit various pipe diameters, the distance between cutting head and sliding section is adjustable. It includes sections which can be slid relatively and fixed in different positions, preferably by a single screw. The strap is recessed to fit over the weld bead. It includes recesses at intervals, into which the traction lever may be inserted, plugging-in approximately radially. Inclination of the cutting blade corresponds with the tangent at the contact location. |
