Method and apparatus for butt welding of plastic pipes of large diameter
OwnerRobert Warthmanninventor
Life of this patent
Estimating the term…
Abstract
The welding apparatus serves for the purpose of butt-welding of plastic pipes of diameters larger than 500 mm. All the work is performed by means of the welding apparatus from inside the pipe. Thereby the working time is reduced, the welding quality ensured, and the installation becomes faster. Lifting cranes and heating tents become unnecessary. A novelty is also the possibility of welding pipes together at an angle position. As the welding apparatus is collapsible, it may also be advantageously used for repair work on old pipes in the ground (relining), with a minimum exposure of the pipes.
Claims8
Method for welding plastic pipes of large diameter, characterized in that welding apparatus is placed inside the pipe
- said welding apparatus aligns the pipe ends (11, 12) by means of a clamping effect of the pipe ends onto a common axle (1),
- and said welding apparatus pulls the pipe ends (11, 12) together to a distance suitable for turning of the pipe ends,
- the pipe ends (11, 12) are prepared for the welding by means of turning,
- the pipe ends (11, 12) are heated by means of a reflector operating from inside the pipe,
- the pipe ends, which are still warm, are pulled together by the welding apparatus for the purpose of welding together, and
- after cooling down of the welding section, the welding apparatus releases the clamping effect and thereupon either is removed from the pipe or the pipe itself is pulled away.
An apparatus for welding plastic pipe of large diameter, comprising,
- a clamping device for holding the pipe ends,
- a turning device for the pipe ends,
- a heating device for the pipe ends, and
- a pressing device for pressing the pipe ends together,
- characterized in that, by means of the said appparatus, all the operations can be performed from inside the pipe.
Dependencies are inferred from the claim text.