WO2000013877A1 - Device for producing pipes - Google Patents

Device for producing pipes Download PDF

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Publication number
WO2000013877A1
WO2000013877A1 PCT/DE1999/002396 DE9902396W WO0013877A1 WO 2000013877 A1 WO2000013877 A1 WO 2000013877A1 DE 9902396 W DE9902396 W DE 9902396W WO 0013877 A1 WO0013877 A1 WO 0013877A1
Authority
WO
WIPO (PCT)
Prior art keywords
mandrel
vacuum source
vacuum
pipes
spray head
Prior art date
Application number
PCT/DE1999/002396
Other languages
German (de)
French (fr)
Inventor
Gmbh Rahn Plastmaschinen Unicor
Original Assignee
HÄFNER, Gerhard
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HÄFNER, Gerhard filed Critical HÄFNER, Gerhard
Publication of WO2000013877A1 publication Critical patent/WO2000013877A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/908—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article characterised by calibrator surface, e.g. structure or holes for lubrication, cooling or venting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/303—Extrusion nozzles or dies using dies or die parts movable in a closed circuit, e.g. mounted on movable endless support
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
    • B29C48/902—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies internally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/006—Using vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/16—Cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/904—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article using dry calibration, i.e. no quenching tank, e.g. with water spray for cooling or lubrication
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/18—Pleated or corrugated hoses

Definitions

  • the invention relates to a device for the production of pipes, in particular. corrugated or finned tubes, with a spray head and a cooling mandrel downstream of the spray head in the direction of production of the tubes, which is formed on its outer surface with vacuum grooves which are connected to a vacuum source.
  • Such a device is known in various forms.
  • US Pat. No. 4,377,545 describes a device for producing two other pipes, a corrugated intermediate wall being formed between a smooth outer wall and a smooth inner wall. This is achieved in that there is a corrugation of the intermediate wall due to the different speeds of movement of said walls.
  • the corrugated partition wall braces the double-walled tube.
  • a device for producing pipes is known from US Pat. No. 4,663,107, a particular temperature control and the use of two corresponding shaped sleeves being important there.
  • US-A 4 808 908 describes a device for producing pipes, the cooling mandrel arranged downstream of the spray head in the production direction of the pipes Calibration of the pipe produced using vacuum is used.
  • the cooling mandrel is formed on its outer surface with vacuum grooves which are divided into at least two groove groups. For this purpose, annular distributor grooves are provided, one of which
  • Each of the two groups of vacuum grooves also has helical grooves that are fluidically connected with annular grooves.
  • a device for producing pipes is known from US Pat. No. 5,186,878, vacuum grooves being provided on the outer lateral surface of a cow mandrel.
  • the vacuum grooves are fluidically connected to a suction connection which is provided at the downstream end section of the cow mandrel.
  • a limiting lip is formed which runs around the outer lateral surface of the cow mandrel.
  • EP 0 483 153 B1 discloses a method for producing pipes, in which a tubular parison made of preheated thermoplastic material is extruded into a tubular form and the parison is guided over the outer surface of a cow mandrel to form a shaped tube. There, negative pressure is applied from inside the cow mandrel to the inner wall of the shaped tube via connecting channels and branching channels. At intervals that require an enlarged cross section, alternatively, overpressure is also applied through the connecting channels and a pressure-carrying branching channel. All these known devices of the type described above have in common that the vacuum source fluidically connected to the cooling mandrel on the side of the spray head facing away from the cooling mandrel, ie upstream of the pipe in the direction of production of the pipe
  • Spray head is provided. This means that the vacuum from the vacuum source must be passed through the spray head into the interior of the cow mandrel in order to establish a fluidic connection from the interior of the cow mandrel to the vacuum grooves provided on the outer surface of the cow mandrel.
  • the supply of the vacuum from the vacuum source provided upstream in front of the spray head through the spray head to the cooling mandrel means a correspondingly large outlay which results from the vacuum lines through the entire spray head. With these lines through the spray head, temperature influences or insulation problems can hardly be eliminated or can only be eliminated with correspondingly great effort.
  • the invention has for its object to provide a device of the type mentioned, in which the effort to produce the vacuum for the vacuum grooves provided on the outer surface of the cow mandrel is comparatively small.
  • a vacuum line does not run through the spray head and the cooling mandrel, as in the known devices of the type mentioned above, but only the energy supply line for the vacuum source provided at the downstream end section of the cow mandrel.
  • the device according to the invention is particularly expedient, in particular for the production of pipes with larger nominal diameters, because a vacuum on the outer lateral surface of the mandrel of such a device for the production of
  • Pipes are only relevant for larger pipe sizes, the placement of the vacuum source at the downstream end section of the mandrel is unproblematic.
  • the device according to the invention is advantageously also suitable for producing double-walled tubes.
  • the uncomplicated and inexpensive supply of the energy required for the vacuum source to the vacuum source is advantageous.
  • the vacuum source can have an electric motor drive and the
  • Power supply line can be formed by an electrical connection line.
  • Such a design has the advantage that the strength of the vacuum on the outer lateral surface of the cow mandrel can be regulated very finely and very easily controlled via the electrical energy supplied. This regulation and control is possible in a simple manner depending on the entire extrusion process.
  • Another advantage is there in the fact that according to the invention, no sealing problems occur during assembly and disassembly of the cow mandrel, as is required, for example, when the pipes to be manufactured are changed, because the cooling mandrel can be replaced together with the associated vacuum source. In the case of a vacuum source with an electric motor drive, according to the invention only one electrical plug needs to be pulled.
  • the vacuum source it is also possible for the vacuum source to have a Venturi nozzle device and for the energy supply line to be formed by a pipeline for a drive medium.
  • the Venturi nozzle device can be acted upon with the aid of a liquid forming the drive medium or with the aid of a compressed gas.
  • temperature influences on the drive medium, in particular by the spray head are not significant. Sealing problems are also relatively uncritical. Since so-called supporting air is often required for the production of corrugated pipes, the corresponding spray head of the device for producing such corrugated pipes is usually pressurized gas, i.e. Compressed air lines equipped.
  • Compound pipes are usually used with water-cooled cooling mandrels, which means that corresponding liquid, ie water, feed lines are available.
  • a vacuum source according to the invention with a Venturi nozzle device is used, the advantage of devices of the last-mentioned type with air lines for supporting air or with cooling water supply lines is that they are also used for those downstream End portion of the cow mandrel provided vacuum source can be used, so that no additional own supply lines for the vacuum source must be provided.
  • the drive energy required for the vacuum source can thus be diverted from the corresponding, already existing energy for the supporting air and the cooling of the cow mandrel.
  • the pneumatic or hydraulic energy also represent cost advantages compared to a vacuum to be additionally introduced from outside the spray head.
  • the compressed air used, for example, to generate the vacuum can flow into the pipe produced and contribute to cooling.
  • Flowing water as an energy source for the vacuum source is, for example, supplied to a water cycle, ie after the drive of the
  • Vacuum source fed back into the circuit.
  • a further advantage of the device according to the invention - regardless of whether the vacuum source is operated by an electric motor or by means of a Venturi nozzle device - is that the vacuum grooves on the outer lateral surface of the mandrel from the end section downstream of the tube in the direction of production are easy to implement, because those on the outer lateral surface of the cow's mandrel are connected in a simple manner fluidically directly to the vacuum source.
  • Fig. 2 shows a longitudinal section of a design of the cow mandrel for the device of FIG. 1, and
  • Fig. 3 is a development of the outer surface of a cow mandrel according to Figures 1 or 2 to illustrate a vacuum groove design.
  • Fig. 1 illustrates a device 10 for producing finned tubes from a smooth inner and a ribbed outer layer.
  • the device 10 has a spray head 12 which is connected to an extruder 16 via a distributor device 14.
  • the spray head 12 has two dispensing nozzle devices 18 and 20.
  • the material for the smooth inner layer of the finned tube to be produced is dispensed through the dispensing nozzle device 18 and the material for the finned outer layer of the composite finned tube to be produced is dispensed through the dispensing nozzle device 20.
  • the dispensing nozzle devices 18 and 20 are assigned to a molding section 22 of a corrugator 24.
  • the molding section 22 is schematically illustrated by thin dashed lines.
  • the corrugator 24 has mold jaws 26 which are provided in two mold jaw groups. Along the molding section 22, the mold jaws 26 together with a cooling mandrel 28 form a molding channel corresponding to the pipe to be produced. The direction of production of the tube produced with the device 10 is illustrated by the arrow 30. As can also be seen from FIGS. 2 and 3, the cooling mandrel is formed in a known manner with cooling channels 32 and on its outer lateral surface 34 with vacuum grooves 36. FIG. 3 shows a configuration of the vacuum grooves 36 in a lateral surface development, it being understood, of course, that the vacuum grooves 36 on the outer lateral surface 34 of the cow mandrel 28 can also be designed in any other way, ie, can run.
  • the vacuum grooves 36 are fluidically connected to branch channels 38 in the interior of the cow mandrel 28.
  • the branch channels 38 open out from the cooling mandrel 28 on the end 40 facing away from the spray head 12 and downstream in the production direction of the tubes (arrow 30). In terms of flow, they are connected to a vacuum source 42, which is provided on the downstream end section 44 or on the downstream end face 40 of the cow mandrel 28.
  • the connection of the vacuum source 42 with the branch channels 38 for the vacuum grooves 36 is realized by short connecting lines 46.
  • the vacuum source 42 is by means of a
  • Power supply line 48 connected to an energy source (not shown).
  • the energy supply of the energy supply line 48 is indicated schematically in FIG. 1 by the arrow 50.
  • Power supply line 48 is an electrical connection line if the vacuum source 42 has an electromotive drive.
  • the energy supply line 48 is formed by a pipeline if the vacuum source 42 is designed, for example, with a Venturi nozzle device.
  • the energy supply line 48 runs - as can be seen from FIG. 1 - through the cooling mandrel 28 and through the Spray head 12 of the device 10, which is unproblematic, since this is not a vacuum line but only an energy supply line for the vacuum source 42 provided at the downstream end section 44 of the cow mandrel 28.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

The invention relates to a device (10) for producing pipes. Said device (10) comprises an extruder head (12) and a cooling mandrel (28) which is positioned downstream of the extruder head (12) in the direction of production of the pipes (arrow 30) and has vacuum grooves (36) embodied on its outer jacket surface (34). The vacuum grooves (36) are connected to a vacuum source (42) provided for at that end section (44) of the cooling mandrel (28) which is located downstream in the direction of production of the pipes (arrow 30). The extruder head (12) and cooling mandrel (28) house only a power supply line (48) for the vacuum source (42).

Description

Vorrichtung zur Herstellung von RohrenDevice for the production of pipes
Die Erfindung betrifft eine Vorrichtung zur Herstellung von Rohren, insbes . von Well- oder Rippenrohren, mit einem Spritzkopf und einem dem Spritzkopf in Produktionsrichtung der Rohre nachgeordneten Kühldorn, der an seiner Außenmantelfläche mit Vakuumrillen ausgebildet ist, die mit einer Vakuumquelle verbunden sind.The invention relates to a device for the production of pipes, in particular. corrugated or finned tubes, with a spray head and a cooling mandrel downstream of the spray head in the direction of production of the tubes, which is formed on its outer surface with vacuum grooves which are connected to a vacuum source.
Eine solche Vorrichtung ist in diversen Ausbildungen bekannt. So beschreibt bspw. die US-A 4 377 545 eine Vorrichtung zur Herstellung von zwei andigen Rohren, wobei zwischen einer glatten Außenwand und einer glatten Innenwand eine gewellte Zwischenwand ausgebildet wird. Das wird dadurch erreicht, daß sich infolge der unterschiedlichen Bewegungsgeschwindigkeiten der besagten Wände eine Wellung der Zwischenwand ergibt. Die gewellte Zwischenwand bildet eine Aussteifung des zweiwandigen Rohres .Such a device is known in various forms. For example, US Pat. No. 4,377,545 describes a device for producing two other pipes, a corrugated intermediate wall being formed between a smooth outer wall and a smooth inner wall. This is achieved in that there is a corrugation of the intermediate wall due to the different speeds of movement of said walls. The corrugated partition wall braces the double-walled tube.
Aus der US-A 4 663 107 ist eine Vorrichtung zur Herstellung von Rohren bekannt, wobei dort insbes. eine spezielle Temperaturführung und die Verwendung zweier entspechender Formhülsen von Bedeutung ist.A device for producing pipes is known from US Pat. No. 4,663,107, a particular temperature control and the use of two corresponding shaped sleeves being important there.
Die US-A 4 808 908 beschreibt eine Vorrichtung zur Herstellung von Rohren, wobei der dem Spritzkopf in Produktionsrichtung der Rohre nachgeordnete Kühldorn zur Kalibrierung des hergestellten Rohres mittels Vakuum dient. Der Kühldorn ist an seiner Außenmantelfläche mit Vakuumrillen ausgebildet, die in mindestens zwei Rillen- Gruppen aufgeteilt sind. Zu diesem Zwecke sind ringförmige Verteilerrillen vorgesehen, von welchen eineUS-A 4 808 908 describes a device for producing pipes, the cooling mandrel arranged downstream of the spray head in the production direction of the pipes Calibration of the pipe produced using vacuum is used. The cooling mandrel is formed on its outer surface with vacuum grooves which are divided into at least two groove groups. For this purpose, annular distributor grooves are provided, one of which
Verteilerrillemöglichst weit vom Spritzkopf entfernt ist, während sich die andere Verteilerrille möglichst nahe beim Spritzkopf befindet. Jede der beiden Gruppen Vakuumrillen weist außerdem schraubenlinienförmige Rillen auf, die mit Ringnuten strömungstechnisch verbunden sind.Is as far as possible from the spray head, while the other distribution groove is as close as possible to the spray head. Each of the two groups of vacuum grooves also has helical grooves that are fluidically connected with annular grooves.
Aus der US-A 5 186 878 ist eine Vorrichtung zur Herstellung von Rohren bekannt, wobei an der Außenmantelfläche eines Kuhldorns Vakuumrillen vorgesehen sind. Die Vakuumrillen sind mit einem Sauganschluß strömungstechnisch verbunden, der am stromabwartigen Endabschnitt des Kuhldorns vorgesehen ist. Am stromaufwärtigen Endabschnitt des Kuhldorns ist eine Begrenzungslippe ausgebildet, die um die Außenmantelfläche des Kuhldorns umläuft.A device for producing pipes is known from US Pat. No. 5,186,878, vacuum grooves being provided on the outer lateral surface of a cow mandrel. The vacuum grooves are fluidically connected to a suction connection which is provided at the downstream end section of the cow mandrel. At the upstream end section of the cow mandrel, a limiting lip is formed which runs around the outer lateral surface of the cow mandrel.
Aus der EP 0 483 153 Bl ist ein Verfahren zur Herstellung von Rohren bekannt, wobei ein rohrförmiger Külbel aus vorgewärmtem thermoplastischem Material in eine rohrförmige Form extrudiert und der Külbel über die Außenmantelfläche eines Kuhldorns geführt wird, um ein formgestaltetes Rohr zu bilden. Dort wird Unterdruck von innerhalb des Kuhldorns auf die Innenwandung des formgestalteten Rohres über Verbindungskanäle und Verzweigungskanäle angewandt. In Abständen, die einen vergrößerten Querschnitt fordern, wird alternativ auch Überdruck durch die Verbindungskanäle und einen druckführenden Verzweigungskanal angewandt. Allen diesen bekannten Vorrichtungen der oben beschriebenen Art ist gemeinsam, daß die mit dem Kühldorn strömungstechnisch verbundene Vakuumquelle auf der vom Kühldorn abgewandten Seite des Spritzkopfes, d.h. in Produktionsrichtung des Rohres stromaufwärts vor demEP 0 483 153 B1 discloses a method for producing pipes, in which a tubular parison made of preheated thermoplastic material is extruded into a tubular form and the parison is guided over the outer surface of a cow mandrel to form a shaped tube. There, negative pressure is applied from inside the cow mandrel to the inner wall of the shaped tube via connecting channels and branching channels. At intervals that require an enlarged cross section, alternatively, overpressure is also applied through the connecting channels and a pressure-carrying branching channel. All these known devices of the type described above have in common that the vacuum source fluidically connected to the cooling mandrel on the side of the spray head facing away from the cooling mandrel, ie upstream of the pipe in the direction of production of the pipe
Spritzkopf vorgesehen ist. Das bedeutet, daß das Vakuum von der Vakuumquelle durch den Spritzkopf in das Innere des Kuhldorns geführt werden muß, um vom Inneren des Kuhldorns eine strömungstechnische Verbindung zu den an der Außenmantelfläche des Kuhldorns vorgesehenen Vakuumrillen herzustellen. Die Zuführung des Vakuums von der stromaufwärts vor dem Spritzkopf vorgesehenen Vakuumquelle durch den Spritzkopf hindurch zum Kühldorn bedeutet einen entsprechend großen Aufwand, der aus den Vakuumleitungen durch den gesamten Spritzkopf hindurch resultiert. Bei diesen Leitungen durch den Spritzkopf hindurch sind Temperaturbeeinflussungen bzw. Isolierprobleme kaum oder nur mit entsprechend großem Aufwand beseitigbar.Spray head is provided. This means that the vacuum from the vacuum source must be passed through the spray head into the interior of the cow mandrel in order to establish a fluidic connection from the interior of the cow mandrel to the vacuum grooves provided on the outer surface of the cow mandrel. The supply of the vacuum from the vacuum source provided upstream in front of the spray head through the spray head to the cooling mandrel means a correspondingly large outlay which results from the vacuum lines through the entire spray head. With these lines through the spray head, temperature influences or insulation problems can hardly be eliminated or can only be eliminated with correspondingly great effort.
Deshalb liegt der Erfindung die Aufgabe zugrunde, eine Vorrichtung der eingangs genannten Art zu schaffen, bei welcher der Aufwand zur Herstellung des Vakuums für die an der Außenmantelfläche des Kuhldorns vorgesehenen Vakuumrillen vergleichsweise klein ist.Therefore, the invention has for its object to provide a device of the type mentioned, in which the effort to produce the vacuum for the vacuum grooves provided on the outer surface of the cow mandrel is comparatively small.
Diese Aufgabe wird bei einer Vorrichtung der eingangs genannten Art erfindungsgemäß dadurch gelöst, daß die Vakuumquelle an dem in Produktionsrichtung der Rohre stromabwartigen Endabschnitt des Kuhldorns vorgesehen ist und durch den Spritzkopf und den Kühldorn nur eineThis object is achieved according to the invention in a device of the type mentioned in the introduction in that the vacuum source is provided on the end section of the cow mandrel downstream in the production direction of the tubes and only one is provided by the spray head and the cooling mandrel
Energieversorgungsleitung für die Vakuumquelle verläuft. Erfindngsge äß verläuft durch den Spritzkopf und den Kühldorn nicht wie bei den bekannten Vorrichtungen der oben genannten Art eine Vakuumleitung hindurch, sondern nur die Energieversorgungsleitung für die am stromabwartigen Endabschnitt des Kuhldorns vorgesehene Vakuumquelle.Power supply line for the vacuum source runs. According to the invention, a vacuum line does not run through the spray head and the cooling mandrel, as in the known devices of the type mentioned above, but only the energy supply line for the vacuum source provided at the downstream end section of the cow mandrel.
Temperaturbeeinflussungen insbes. durch den Spritzkopf und entsprechende Isolierprobleme sind bei der erfindungsgemäßen Vorrichtung folglich nicht relevant. Das stellt einen erheblichen Vorteil der erfindungsgemäßen Vorrichtung dar.Temperature influences in particular by the spray head and corresponding insulation problems are consequently not relevant to the device according to the invention. This represents a considerable advantage of the device according to the invention.
Nachdem die erfindungsgemäße Vorrichtung insbesondere zur Herstellung von Rohren mit größeren Nennweiten besonders zweckmäßig ist, weil Vakuum an der Außenmantelfläche des Kuhldorns einer solchen Vorrichtung zur Herstellung vonSince the device according to the invention is particularly expedient, in particular for the production of pipes with larger nominal diameters, because a vacuum on the outer lateral surface of the mandrel of such a device for the production of
Rohren erst bei größeren Rohr-Nennweiten relevant ist, ist die Unterbringung der Vakuumquelle am stromabwartigen Endabschnitt des Kuhldorns unproblematisch.Pipes are only relevant for larger pipe sizes, the placement of the vacuum source at the downstream end section of the mandrel is unproblematic.
Die erfindungsgemäße Vorrichtung eignet sich in vorteilhafter Weise auch zur Herstellung doppelwandiger Rohre. Vorteilhaft ist die unkomplizierte und preisgünstige Zuführung der für die Vakuumquelle erforderlichen Energie zur Vakuumquelle. Dabei kann die Vakuumquelle einen elektromotorischen Antrieb aufweisen und dieThe device according to the invention is advantageously also suitable for producing double-walled tubes. The uncomplicated and inexpensive supply of the energy required for the vacuum source to the vacuum source is advantageous. The vacuum source can have an electric motor drive and the
Energieversorgungsleitung von einer elektrischen Anschlußleitung gebildet sein. Eine derartige Ausbildung weist den Vorteil auf, daß sich über die zugeführte elektrische Energie die Stärke des Vakuums an der Außenmantelfläche des Kuhldorns sehr fein regeln und sehr einfach kontrollieren läßt. Diese Regelung und Kontrolle ist in Abhängigkeit des gesamten Extrusionsprozesses in einfacher Weise möglich. Ein weiterer Vorteil besteht darin, daß bei der Montage und bei der Demontage des Kuhldorns, wie er z.B. bei einem Dimensionswechsel der herzustellenden Rohre erforderlich ist, erfindungsgemäß keine Dichtungsprobleme auftreten, weil der Kühldorn gemeinsam mit der zugehörigen Vakuumquelle ausgetauscht werden kann. Bei einer Vakuumquelle mit elektromotorischem Antrieb braucht erfindungsgemäß nur ein elektrischer Stecker gezogen zu werden.Power supply line can be formed by an electrical connection line. Such a design has the advantage that the strength of the vacuum on the outer lateral surface of the cow mandrel can be regulated very finely and very easily controlled via the electrical energy supplied. This regulation and control is possible in a simple manner depending on the entire extrusion process. Another advantage is there in the fact that according to the invention, no sealing problems occur during assembly and disassembly of the cow mandrel, as is required, for example, when the pipes to be manufactured are changed, because the cooling mandrel can be replaced together with the associated vacuum source. In the case of a vacuum source with an electric motor drive, according to the invention only one electrical plug needs to be pulled.
Erfindungsgemäß ist es auch möglich, daß die Vakuumquelle eine Venturidüseneinrichtung aufweist und die Energieversorgungsleitung von einer Rohrleitung für ein Antriebsmedium gebildet ist. Die Venturidüseneinrichtung kann hierbei mit Hilfe einer das Antriebsmedium bildenden Flüssigkeit oder mit Hilfe eines Druckgases beaufschlagt werden. Unabhängig davon, ob ein flüssiges oder ein gasförmiges Antriebsmedium für die Venturidüseneinrichtung zur Anwendung gelangt, sind Temperaturbeeinflussungen des Antriebsmediums insbesondere durch den Spritzkopf nicht erheblich. Auch Dichtungsprobleme sind relativ unkritisch. Nachdem zur Herstellung von Wellrohren oftmals eine sogenannte Stützluft benötigt wird, ist der entsprechende Spritzkopf der Vorrichtung zur Herstellung solcher Wellrohre üblicherweise mit Druckgas- d.h. Druckluftleitungen ausgerüstet. Zur Herstellung vonAccording to the invention, it is also possible for the vacuum source to have a Venturi nozzle device and for the energy supply line to be formed by a pipeline for a drive medium. The Venturi nozzle device can be acted upon with the aid of a liquid forming the drive medium or with the aid of a compressed gas. Regardless of whether a liquid or a gaseous drive medium is used for the Venturi nozzle device, temperature influences on the drive medium, in particular by the spray head, are not significant. Sealing problems are also relatively uncritical. Since so-called supporting air is often required for the production of corrugated pipes, the corresponding spray head of the device for producing such corrugated pipes is usually pressurized gas, i.e. Compressed air lines equipped. For production of
Verbundrohren kommen üblicherweise wassergekühlte Kühldorne zur Anwendung, was bedeutet, daß entsprechende Flüssigkeits- d.h. Wasserzuleitungen vorhanden sind. Kommt erfindungsgemäße eine Vakuumquelle mit einer Venturidüseneinrichtung zur Anwendung, so ergibt sich bei Vorrichtungen der zuletzt genannten Art mit Luftleitungen für Stützluft bzw. mit Kühlwasserzuleitungen der Vorteil, daß diese gleichzeitig auch für die am stromabwartigen Endabschnitt des Kuhldorns vorgesehene Vakuumquelle benutzt werden können, so daß keine zusätzlichen eigenen Versorgungsleitungen für die Vakuumquelle vorgesehen werden müssen. Die für die Vakuumquelle benötigte Antriebsenergie kann ird also von der entsprechenden, bereits vorhandenen Energie für die Stützluft und die Kühlung des Kuhldorns abgezweigt werden. Neben elektrischer Energie für die Vakuumquelle stellen also auch die pneumatische bzw. die hydraulische Energie Kostenvorteile gegenüber einem zusätzlich von außerhalb des Spritzkopfes einzubringenden Vakuum dar. Die zur Erzeugung des Vakuums bspw. zur Anwendung gelangende Druckluft kann in das produzierte Rohr einströmen und zur Kühlung beitragen. Strömendes Wasser als Energieträger für die Vakuumquelle wird bspw. einem Wasserkreislauf zugeführt, d.h. nach dem Antrieb derCompound pipes are usually used with water-cooled cooling mandrels, which means that corresponding liquid, ie water, feed lines are available. If a vacuum source according to the invention with a Venturi nozzle device is used, the advantage of devices of the last-mentioned type with air lines for supporting air or with cooling water supply lines is that they are also used for those downstream End portion of the cow mandrel provided vacuum source can be used, so that no additional own supply lines for the vacuum source must be provided. The drive energy required for the vacuum source can thus be diverted from the corresponding, already existing energy for the supporting air and the cooling of the cow mandrel. In addition to electrical energy for the vacuum source, the pneumatic or hydraulic energy also represent cost advantages compared to a vacuum to be additionally introduced from outside the spray head. The compressed air used, for example, to generate the vacuum can flow into the pipe produced and contribute to cooling. Flowing water as an energy source for the vacuum source is, for example, supplied to a water cycle, ie after the drive of the
Vakuumquelle wieder in den Kreislauf zurück eingespeist.Vacuum source fed back into the circuit.
Ein weiterer Vorteil der erfindungsgemäßen Vorrichtung - unabhängig davon, ob die Vakuumquelle elektromotorisch oder mittels einer Venturidüseneinrichtung betrieben wird - besteht darin, daß die Vakuumrillen an der Außenmantelfläche des Kuhldorns von dessen in Produktionsrichtung der Rohre stromabwartigen Endabschnitt ausgehend einfach realisierbar sind, weil die an der Außenmantelfläche des Kuhldorns ausgebildeten Vakuumrillen in einfacher Weise direkt mit der Vakuumquelle strömungstechnisch verbunden sind.A further advantage of the device according to the invention - regardless of whether the vacuum source is operated by an electric motor or by means of a Venturi nozzle device - is that the vacuum grooves on the outer lateral surface of the mandrel from the end section downstream of the tube in the direction of production are easy to implement, because those on the outer lateral surface of the cow's mandrel are connected in a simple manner fluidically directly to the vacuum source.
Weitere Einzelheiten, Merkmale und Vorteile ergeben sich aus der nachfolgenden Beschreibung einer in der Zeichnung dargestellten Ausbildung der erfindungsgemäßen Vorrichtung zur Herstellung von Rohren, insbesondere von Rippenrohren. Es zeigen: Fig. 1 in einer Seitenansicht wesentliche Teile der Vorrichtung,Further details, features and advantages result from the following description of an embodiment of the device according to the invention for the production of tubes, in particular finned tubes, shown in the drawing. Show it: 1 is a side view of essential parts of the device,
Fig. 2 längsgeschnitten eine Ausbildung des Kuhldorns für die Vorrichtung gemäß Fig. 1, undFig. 2 shows a longitudinal section of a design of the cow mandrel for the device of FIG. 1, and
Fig. 3 eine Abwicklung der Außenmantelfläche eines Kuhldorns gemäß den Figuren 1 oder 2 zur Verdeutlichung einer Vakuumrillen-Gestaltung.Fig. 3 is a development of the outer surface of a cow mandrel according to Figures 1 or 2 to illustrate a vacuum groove design.
Fig. 1 verdeutlicht eine Vorrichtung 10 zur Herstellung von Rippenrohren aus einer glatten Innen- und einer gerippten Außenlage. Die Vorrichtung 10 weist einen Spritzkopf 12 auf, der über eine Verteilereinrichtung 14 mit einem Extruder 16 verbunden ist. Der Spritzkopf 12 weist zwei Ausgabedüseneinrichtungen 18 und 20 auf. Durch die Ausgabedüseneinrichtung 18 wird das Material für die glatte Innenlage des herzustellenden Rippenrohres und durch die Ausgabedüseneinrichtung 20 wird das Material für die gerippte Außenlage des herzustellenden Verbundrippenrohres ausgegeben. Die Ausgabedüseneinrichtungen 18 und 20 sind einer Formstrecke 22 eines Korrugators 24 zugeordnet. Die Formstrecke 22 ist durch dünne strichlierte Linien schematisch verdeutlicht. Der Korrugator 24 weist Formbacken 26 auf, die in zwei Formbacken-Gruppen vorgesehen sind. Entlang der Formstrecke 22 bilden die Formbacken 26 gemeinsam mit einem Kühldorn 28 einen dem herzustellenden Rohr entsprechenden Formkanal. Die Produktionsrichtung des mit der Vorrichtung 10 hergestellten Rohres ist durch den Pfeil 30 verdeutlicht. Wie auch aus den Figuren 2 und 3 ersichtlich ist, ist der Kühldorn in bekannter Weise mit Kühlkanälen 32 und an seiner Außenmantelfläche 34 mit Vakuumrillen 36 ausgebildet. Die Figur 3 zeigt in einer Mantelflächenabwicklung eine Gestaltung der Vakuumrillen 36, wobei es sich selbstverständlich versteht, daß die Vakuumrillen 36 an der Außenmantelfläche 34 des Kuhldorns 28 auch beliebig anders gestaltet sein, d.h. verlaufen, können. Die Vakuumrillen 36 sind mit Stichkanälen 38 im Inneren des Kuhldorns 28 strömungstechnisch verbunden. Die Stichkanäle 38 münden an der vom Spritzkopf 12 abgewandten, in Produktionsrichtung der Rohre (Pfeil 30) stromabwartigen Stirnseite 40 aus dem Kühldorn 28 aus. Sie sind strömungstechnisch mit einer Vakuumquelle 42 verbunden, die am stromabwartigen Endabschnitt 44 bzw. an der stromabwartigen Stirnseite 40 des Kuhldorns 28 vorgesehen ist. Die Verbindung der Vakuumquelle 42 mit den Stichkanälen 38 für die Vakuumrillen 36 ist durch kurze Verbindungsleitungen 46 realisiert.Fig. 1 illustrates a device 10 for producing finned tubes from a smooth inner and a ribbed outer layer. The device 10 has a spray head 12 which is connected to an extruder 16 via a distributor device 14. The spray head 12 has two dispensing nozzle devices 18 and 20. The material for the smooth inner layer of the finned tube to be produced is dispensed through the dispensing nozzle device 18 and the material for the finned outer layer of the composite finned tube to be produced is dispensed through the dispensing nozzle device 20. The dispensing nozzle devices 18 and 20 are assigned to a molding section 22 of a corrugator 24. The molding section 22 is schematically illustrated by thin dashed lines. The corrugator 24 has mold jaws 26 which are provided in two mold jaw groups. Along the molding section 22, the mold jaws 26 together with a cooling mandrel 28 form a molding channel corresponding to the pipe to be produced. The direction of production of the tube produced with the device 10 is illustrated by the arrow 30. As can also be seen from FIGS. 2 and 3, the cooling mandrel is formed in a known manner with cooling channels 32 and on its outer lateral surface 34 with vacuum grooves 36. FIG. 3 shows a configuration of the vacuum grooves 36 in a lateral surface development, it being understood, of course, that the vacuum grooves 36 on the outer lateral surface 34 of the cow mandrel 28 can also be designed in any other way, ie, can run. The vacuum grooves 36 are fluidically connected to branch channels 38 in the interior of the cow mandrel 28. The branch channels 38 open out from the cooling mandrel 28 on the end 40 facing away from the spray head 12 and downstream in the production direction of the tubes (arrow 30). In terms of flow, they are connected to a vacuum source 42, which is provided on the downstream end section 44 or on the downstream end face 40 of the cow mandrel 28. The connection of the vacuum source 42 with the branch channels 38 for the vacuum grooves 36 is realized by short connecting lines 46.
Die Vakuumquelle 42 ist mittels einerThe vacuum source 42 is by means of a
Energieversorgungsleitung 48 mit einer (nicht gezeichneten) Energiequelle verbunden. Die Energieversorgung der Energieversorgungsleitung 48 ist in Fig.l durch den Pfeil 50 schematisch angedeutet. Bei derPower supply line 48 connected to an energy source (not shown). The energy supply of the energy supply line 48 is indicated schematically in FIG. 1 by the arrow 50. In the
Energieversorgungsleitung 48 handelt es sich um eine elektrische Anschlußleitung, wenn die Vakuumquelle 42 einen elektromotorischen Antrieb besitzt. Die Energieversorgungsleitung 48 ist von einer Rohrleitung gebildet, wenn die Vakuumquelle 42 bspw. mit einer Venturidüseneinrichtung ausgebildet ist. Die Energieversorgungsleitung 48 verläuft - wie aus Fig. 1 ersichtlich ist - durch den Kühldorn 28 und durch den Spritzkopf 12 der Vorrichtung 10 hindurch, was unproblematisch ist, nachdem es sich hier nicht um eine Vakuumleitung sondern nur um eine Energieversorgungsleitung für die am stromabwartigen Endabschnitt 44 des Kuhldorns 28 vorgesehene Vakuumquelle 42 handelt. Power supply line 48 is an electrical connection line if the vacuum source 42 has an electromotive drive. The energy supply line 48 is formed by a pipeline if the vacuum source 42 is designed, for example, with a Venturi nozzle device. The energy supply line 48 runs - as can be seen from FIG. 1 - through the cooling mandrel 28 and through the Spray head 12 of the device 10, which is unproblematic, since this is not a vacuum line but only an energy supply line for the vacuum source 42 provided at the downstream end section 44 of the cow mandrel 28.

Claims

A n s p r ü c h e : Expectations :
1. Vorrichtung zur Herstellung von Rohren, insbes. von Well- oder Rippenrohren, mit einem Spritzkopf (12) und einem dem Spritzkopf (12) in Produktionsrichtung der Rohre (Pfeil 30) nachgeordneten Kühldorn (28), der an seiner Außenmantelfläche (34) mit Vakuumrillen (36) ausgebildet ist, die mit einer Vakuumquelle (42) verbunden sind, d a d u r c h g e k e n n z e i c h n e t , daß die Vakuumquelle (42) an dem in Produktionsrichtung der Rohre (Pfeil 30) stromabwartigen Endabschnitt (44) des Kuhldorns (28) vorgesehen ist und durch den Spritzkopf ( 12 ) und den Kühldorn (28) eine Energieversorgungsleitung (48) für die Vakuumquelle (42) verläuft.1. Device for the production of pipes, in particular corrugated or finned pipes, with a spray head (12) and a cooling mandrel (28) arranged downstream of the spray head (12) in the production direction of the pipes (arrow 30), which on its outer surface (34) is formed with vacuum grooves (36) which are connected to a vacuum source (42), characterized in that the vacuum source (42) is provided on the end section (44) of the cow mandrel (28) downstream in the production direction of the tubes (arrow 30) and through the spray head (12) and the cooling mandrel (28) run an energy supply line (48) for the vacuum source (42).
2. Vorrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß die Vakuumquelle (42) einen elektromotorischen Antrieb aufweist und daß die Energieversorgungsleitung (48) von einer elektrischen Anschlußleitung gebildet ist.2. Apparatus according to claim 1, that the vacuum source (42) has an electromotive drive and that the power supply line (48) is formed by an electrical connecting line.
3. Vorrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß die Vakuumquelle (42) eine3. Apparatus according to claim 1, d a d u r c h g e k e n n z e i c h n e t that the vacuum source (42)
Venturidüseneinrichtung aufweist und daß die Energieversorgungsleitung (48) von einer Rohrleitung gebildet ist. Venturi nozzle device and that the energy supply line (48) is formed by a pipeline.
PCT/DE1999/002396 1998-09-09 1999-07-31 Device for producing pipes WO2000013877A1 (en)

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DE19841156.119980909 1998-09-09
DE19841156A DE19841156C1 (en) 1998-09-09 1998-09-09 Corrugated or ribbed pipe extrusion equipment with reduced cost for supplying vacuum to grooves on the cooling mandrel

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