Pipe extrusion plant

a pipe extrusion and pipe technology, applied in the field of pipe extrusion plants, can solve problems such as the tendency to assume oval shape, and achieve the effect of reducing weight and reducing weigh

Inactive Publication Date: 2008-12-11
KRAUSS MAFFEI KUMSTSTOFFTECHNIK GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014]The present invention resolves prior art problems by so constructing a roll as to adjust its vertical position in dependence on the weight load acting on the roll. Hereby, the invention is based on the recognition that pipes of greater diameter normally have a greater weight per meter. Thus, when the roll is loaded by a pipe of greater weight, and thus normally also of greater diameter, the roll moves further downwards than would be the case, when the weight load on the roll is smaller as a result of a smaller pipe and thus of smaller weight. Thus, when being exposed to a smaller pipe, the roll moves upwards in opposite direction. In this way, the center line for pipes of different diameter can still be maintained at substantial same vertical height in a simple manner.

Problems solved by technology

As a result, the respective parts (e.g. calibrator) must be exchanged, necessitating a shutdown of the machine and causing downtimes.
The use of such support disks appears necessary because the pipe is still very unstable in this early phase and has a tendency to assume an oval shape without this guiding aid.
A drawback of a tube extrusion plant allowing the production of pipes with different diameter is however the need to also change the pipe guidance during each diameter change and the need to manually conform or exchange the guides.

Method used

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Embodiment Construction

[0026]Throughout all the Figures, same or corresponding elements are generally indicated by same reference numerals. These depicted embodiments are to be understood as illustrative of the invention and not as limiting in any way. It should also be understood that the drawings are not necessarily to scale and that the embodiments are sometimes illustrated by graphic symbols, phantom lines, diagrammatic representations and fragmentary views. In certain instances, details which are not necessary for an understanding of the present invention or which render other details difficult to perceive may have been omitted.

[0027]Turning now to the drawing, and in particular to FIG. 1, there is shown a schematic illustration of a pipe extrusion plant generally designated by reference numeral 10. The pipe extrusion plant 10 includes an extruder 12, arranged at the beginning of the pipe extrusion plant 10 for receiving starting material which is melted by the extruder 12 and discharged from the opp...

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Abstract

A pipe extrusion plant for producing pipes with a variable diameter includes an extruder, an adjustable calibration device, and a cooling device, whereby a pipe to be produced is guided at least in part during the production process. In order to be able to provide a guide that is suited to different pipe diameters, a roll assembly is provided to include a row of rolls which are placed one behind the other in a take-off direction, with each roll mounted in a bracket and supported to allow vertical positioning thereof in dependence on the pipe diameter.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS[0001]This application is a divisional of prior filed copending U.S. Application Ser. No. 11 / 287,938, filed Nov. 28, 2005, the priority of which is hereby claimed under 35 U.S.C. §120, and which is a continuation of prior filed copending PCT International Application No. PCT / EP2004 / 004361, filed Apr. 24, 2004, which designated the United States and on which priority is claimed under 35 U.S.C. §120 and which claims the priority of German Patent Application, Ser. No. 103 24 187.6, filed May 28, 2003, pursuant to 35 U.S.C. 119(a)-(d).[0002]The contents of U.S. application Ser. No. 11 / 287,938, International Appl. No. PCT / EP2004 / 004361, and German Appl. No. 103 24 187.6, are incorporated herein by reference in its entirety as if fully set forth herein.BACKGROUND OF THE INVENTION[0003]The present invention relates to a pipe extrusion plant for production of pipes with adjustable diameter.[0004]Nothing in the following discussion of the state of the ...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): B21C3/00B29C48/09B29C48/355B29C48/90B29C48/92
CPCB29C47/0023B29C47/34B29C47/882B29C47/92B29C47/907B29C2947/92123B29C2947/92428B29C47/903B29C48/92B29C48/09B29C48/355B29C48/9115B29C48/913B29C48/919B29C48/90B29C48/903B29C48/905B29C48/907B29C2948/92123B29C2948/92428
InventorULRICH, HERBERT
OwnerKRAUSS MAFFEI KUMSTSTOFFTECHNIK GMBH