Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – Automatic and/or material-triggered control
Patent
1990-04-20
1994-03-01
Simmons, David A.
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
Automatic and/or material-triggered control
156423, 156499, 156228, 156294, 1563042, 1563099, B32B 3100
Patent
active
052903877
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device for welding tubular components of plastics material, as characterized in the preamble of claim 1.
A device for welding tubular components is known in which the heatable jaws have at the inner circumference an annular duct in which a vacuum is generated during or after the welding process of the axially abutting tubular components. The vacuum has the purpose to prevent the molten material to drop inwardly or to prevent the formation of an inner bead at the welded connection. However, it has been found that it is not possible to manufacture welded connections by means of this method and by means of this device which are of sufficient strength and smooth at the inner circumference.
It is also known (DE-PS 283 0722), for reducing inner welding beads at the circumference of the tubular components, to arrange an elastic insert which presses against the inner welding bead.
However, for welding the tubular components, the ends thereof are heated by pressing them against heating elements and the ends are subsequently pressed together. A welded connection which is completely free of beads cannot be achieved by means of this method. In addition, by heating the front ends of the tubular components, the interior of these components may be contaminated, so that the necessary cleanliness is not achieved and the connection is not suitable for pipeline systems which conduct media having a high degree of purity.
A device of the above-mentioned type is known from DE-C2 29 23 205 by means of which welding of the ends of tubular plastic components which is free of beads is possible.
This device can only be used for one pipe dimension. The heating device has half shells of metal the middle portion of which is electrically heatable for the butt joint and the other portion at both ends seen in longitudinal direction is equipped with cooling chambers. This requires a complicated construction and a control of the individual zones which is very disadvantageous. In addition, the heating zone cannot be quickly cooled after the heating process which results in long welding times.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide a device of the above-mentioned type by means of which it is possible to manufacture a bead-free and secure connection of tubular components of plastics material, wherein the device must be of simple construction and equipped for a problem-free operation even if used at the place of assembly of a pipeline system which is particularly intended for the conduction of media having a high degree of purity. In addition, it should be possible to use the device for welding tubular components having different diameters, while requiring short change-over times, short welding times and always resulting in uniformly excellent welded connections.
In accordance with the invention, the object is met by the characterizing features of claim 1.
BRIEF DESCRIPTION OF THE DRAWINGS
An example of the invention is illustrated in the enclosed drawings and is described in the following.
In the drawing:
FIG. 1 shows a partial front view of a device for welding,
FIG. 2 shows a section along the line II--II of FIG. 1,
FIG. 3 shows a partial section along line III--III of FIG. 2,
FIG. 4 shows a partial section of a different embodiment of FIG. 2, wherein the section extends transversely through the heating device, and
FIG. 5 shows a sectional view along line V--V of FIG. 4.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows a partial front view of the device with a frame 1, a heating device 2 and a pipe clamping device 3, wherein on the second side of the heating device 2 is provided another pipe clamping device, not shown.
As can be seen in FIG. 2, guides 4a, 4b are arranged on the upper side of the frame 1. The pipe clamping devices 3 are slidable in longitudinal direction on the guides 4a, 4b and can be fixedly connected to the frame 1 by means of gripping devices 5.
The heating device 2 can be mounted on the g
REFERENCES:
patent: 4174996 (1979-11-01), Hunter
patent: 4631107 (1986-12-01), Ramsey
patent: 4684430 (1987-08-01), Handa et al.
patent: 4695335 (1987-09-01), Lyall
patent: 4876041 (1989-10-01), Hanselka
patent: 4927642 (1990-05-01), Kunz
Hilpert Bruno
Kramer Herbert
Georg Fischer AG
Sells J.
Simmons David A.
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