JPH03164228A - Pipe manufacturing line - Google Patents

Abstract

PURPOSE: To produce normal plastic pipes until there is renewed demand for corrugated pipe by providing a molten plastic pipe blank to the one end of a calibrating basin by an extruder and processing a substantially smooth plastic pipe from the second end of the calibrating basin by another processing device for the corrugated or ribbed pipe. CONSTITUTION: A production line differs from a production line for smooth pipe in respect of a corrugator 3. A calibrating basin 8 having two circulation paths for molding is disposed between separated driving-type mold forming portions 9, 10 of the corrugator. A pipe blank 11 from a die 2 of an extruder is fed through a brass calibrating barrel 13 at one end of the calibrating basin 8 into a cooling space and a subatmospheric pressure draws the pipe tightly against the inner wall of the calibrating barrel, thereby forming the pipe having a glassy, smooth surface. The pipe is cooled across the length of the calibrating basin 8 by water jets 14, whereafter it leaves the calibrating basin drawn by the drawing means 5 as the pipe 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pipe production line comprising a production line for producing corrugated or ribbed pipes.

In the following, the general name corrugated pipe will be used for the type of pipe. For example, Finnish Patent No. 60
No. 825, European Patent Application No. 208 055 and DE 36 22 775 disclose that the moldable mass brought to a plastic state is extruded by a die between movable forming half-moulds which are pressed towards each other; A manufacturing line for corrugated pipe is taught that provides a continuous corrugated flange structure on the outside of the pipe.

Such production lines (including control units for movable parts called corrugators) are very heavy, rigid, require precise installation, and often cannot meet the demands of corrugated pipes. It is far too efficient from that point of view, so the production line is idle most of the time. The invention that we are about to disclose is based on the realization of the aforementioned problems, on the one hand, the line for corrugated pipes has the same machinery and means as the line for smooth-walled pipes, except for the corrugators, and on the other hand The design of certain corrugators is based on the idea that the upper and lower paths for transporting half molds can be driven separately for maintenance and other similar operations as well as for mold changes. Thus, the production line for plastic pipes according to the invention consists of a forming means for the pipes to be produced, i.e. a corrugator, and a forming means for smooth pipes, i.e. =1 a calibration container placed between the paths of the corrugator. An extruder which normally feeds the formable mass into a corrugator feeds a molten plastic pipe blank into one end of the proofing vessel, and a generally smooth plastic pipe exiting from the second end of said proofing vessel is a corrugated pipe. Or yet another place for ribbed pipes! ! It is characterized by being processed by a device.

The most important feature of the invention is that ordinary plastic pipes are produced until there is a new demand for corrugated pipes, without idle expensive production lines, without moving corrugators or dismantling equipment. That's true. Therefore, the calibration container is simply removed and, if possible, the mold for the associated corrugated pipe is installed or replaced, the molds are driven together and the production of the continuous construction of the corrugated pipe begins. .

The invention will now be described by way of example with reference to the accompanying drawings, in which: FIG.

'PAj for ribbed (pleated) pipe according to Figure 1
In the a-line, the extruder is designated by reference number 1, the die of the extruder is designated by reference number 2, and the corrugator (corrugator)
is designated by the reference number 3, the pipe cooling tank is designated by the reference number 4, the pipe drawing device is designated by the reference number 5, the cutting device is designated by the reference number 6, and the pipe product is cut to length. The finishing and processing equipment for this is designated by the reference number 7. This production line essentially differs from the production line for smooth pipes only with regard to the corrugators 3.

In the drawing, the corrugator is of the type with two circulation paths for the forming means, i.e. the molds, said paths being separated and driven by a vertical displacement means A (which may for example be a rotating rod) as shown in the drawing. It's like being done. Corrugators can also be used in which the mold path is in a horizontal plane and the return movement of the mold is along a separate path.

Otherwise, the purpose and function of the divine equipment in a production line of this kind will be clear to those skilled in the art and will not be described in detail here.9 FIG. A calibration container 8 is shown arranged between the separate ribbed mold formations 9,10. The pipe blank coming out of the die of the extruder ■1 is the brass calibration barrel 1 placed at one end of the calibration container according to the arrow
3 into a vacuumed cooling space, and the vacuum presses the pipe tightly against the inner wall of the proof strip, creating a glass-like smooth surface on the pipe. The pipe is cooled over the length of the calibration vessel by a water jet 14 according to the prior art. The pipe then exits the calibration vessel and
The pipe 12, which has been adjusted to a predetermined size and cooled, is pulled out by the drawer means 5 (FIG. 1). Cooling and production rates may be improved by using several cooling vessels 4.

The calibration container 8 can be prepared, for example, by fixing the calibration container to the mold structure with a support rod, or by placing the calibration container supported by the spacer 15 on the mold 16 as shown in FIG. It may be fixed between the mold forming parts 9 and 10 which are constituted by molds 16 connected in series. The ellipse in FIG. 2 is a part of the cooling chamber 4 (see FIG. 1) for ribbed pipes, for example, which are pressed telescopically between the open molds of a corrugator, as indicated by the dotted line in FIG. It can also be used when a calibration container according to the present invention is formed by a section. Depending on the structure of the corrugator and the size range of the pipes to be manufactured, the mold may be removed and the cooling tank 8 placed between the mold transfer paths 17 and 18 for manufacturing. It will be clear to those skilled in the art that the invention is not limited to the embodiments described above, but that other embodiments of the invention may be modified within the scope of the claims. Instead of an evacuated calibration vessel, a different structure may equally be used: a plug in the pipe blank, and a pressure calibration equipment capable of maintaining a reduced pressure in the blank pipe. The mold may also be used as a structural part for a calibration container. Thereby, the calibration container is formed by a closed system of molds and end elements arranged at the front and rear ends.

[Brief explanation of the drawing]

FIG. 1 shows a conventional manufacturing line for ribbed pipes. The second UA shows a sheet container for smooth pipes arranged in a corrugator according to the invention. DESCRIPTION OF SYMBOLS 1... Extruder, 2... Extruder die, 3... Corrugator, 4... Pipe cooling tank, 5... Pipe drawing device, 6... Cutting device, 7... Finishing and Processing device, 8... Calibration container, 9, 10... Mold forming section, 13... Calibration barrel, ]5... Spacer, 16... Mold. FIG. 1 FI3.2

Claims (4)

[Claims] (1) In a pipe production line consisting of a production line for producing corrugated pipes or ribbed pipes, the forming means for the pipe to be produced, i.e. the corrugator (3), are replaced by the forming means for the smooth pipe, i.e. the corrugator path (17). ,1
8), an extruder which normally feeds the moldable mass into the corrugator supplies a molten plastic pipe blank (11) to one end of the proofing container;
Pipe production line, characterized in that the substantially smooth plastic pipe (12) emerging from the second end of said calibration vessel is treated in a further processing device (4-7) for corrugated or ribbed pipes. (2) In the production line according to claim 1, the calibration container (
8) is arranged between the separate driving forming halves of the corrugator, ie between the mold forming parts (9, 10). (3) In the production line according to claim 1 or 2, the calibration container (8) is constituted by a part of the cooling tank (4) for the ribbed pipe, and the ribbed pipe is connected to the corrugator (3).
A production line characterized in that it is pressed between open mold forming channels (17, 18) or mold forming sections (9, 10). (4) In the production line according to claim 1, the calibration container (
8) are pressed toward each other in a mold (9,
10) and a spacer (15) arranged at the front and rear ends of the forming path, characterized in that the calibration barrel (13) is connected to the spacer arranged at the front end.