EP0907488A1 - Dispositif ejecteur - Google Patents

Dispositif ejecteur

Info

Publication number
EP0907488A1
EP0907488A1 EP97923707A EP97923707A EP0907488A1 EP 0907488 A1 EP0907488 A1 EP 0907488A1 EP 97923707 A EP97923707 A EP 97923707A EP 97923707 A EP97923707 A EP 97923707A EP 0907488 A1 EP0907488 A1 EP 0907488A1
Authority
EP
European Patent Office
Prior art keywords
piston
ejector
base plate
preform
ejector device
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
EP97923707A
Other languages
German (de)
English (en)
Inventor
Otto Hofstetter
Luis Fernandez
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Otto Hofstetter AG
Original Assignee
Otto Hofstetter AG
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 Otto Hofstetter AG filed Critical Otto Hofstetter AG
Publication of EP0907488A1 publication Critical patent/EP0907488A1/fr
Ceased legal-status Critical Current

Links

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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/7207—Heating or cooling of the moulded articles
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/40—Removing or ejecting moulded articles
    • B29C45/42—Removing or ejecting moulded articles using means movable from outside the mould between mould parts, e.g. robots
    • B29C45/4225—Take-off members or carriers for the moulded articles, e.g. grippers
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/40—Removing or ejecting moulded articles
    • B29C45/42—Removing or ejecting moulded articles using means movable from outside the mould between mould parts, e.g. robots
    • B29C2045/4241—Auxiliary means for removing moulded articles from the robot
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/7207—Heating or cooling of the moulded articles
    • B29C2045/7214—Preform carriers for cooling preforms
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/7207—Heating or cooling of the moulded articles
    • B29C2045/7214—Preform carriers for cooling preforms
    • B29C2045/7221—Means for ejecting the preforms
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/7207—Heating or cooling of the moulded articles
    • B29C2045/7214—Preform carriers for cooling preforms
    • B29C2045/7235—Mechanical retaining means for preform ends
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform

Definitions

  • the present invention relates to an ejection device for a removal device suitable for removing preforms according to the preamble of claim 1.
  • Machines for the production of preforms or preforms, in particular for the production of beverage bottles made of PET essentially comprise a plastic unit and a molding tool unit.
  • Removal devices for removing the preforms from the molding tool are being used ever more frequently in order to reduce the cycle times and in particular the downtimes of the plastic injection molding machines caused by the long cooling time of the preforms.
  • the molds after the injection process, respectively. opened prematurely during the cooling phase and the preforms which have not yet cooled completely are automatically picked up by these removal devices and cooled further. During this cooling time, the molds can be closed again and refilled.
  • Modern removal devices can usually hold three batches made in succession before they eject the first batch.
  • a removal device which comprises an ejector piston, the piston head of which can be displaced in a pressure-tight manner in the preform holder.
  • a pressure chamber is formed between the piston head and the bottom part of the preform holder and communicates with a compressed air duct system provided in the base plate of the removal device.
  • the ejector piston has a piston pin which is guided through a bore in the base part of the preform holder and in turn is mounted in a pressure-tight and movable manner in this bore. This piston pin protrudes into a second chamber (hereinafter also referred to as a vacuum chamber), which is provided in the base plate of the removal device
  • Vacuum channel system communicates. This second chamber communicates through a bore through the piston pin and piston head into the interior of the preform holder.
  • the removal plate is positioned in the desired manner in the open mold. Due to the suction created by the vacuum system, the individual preforms are drawn into the respective preform holder until it is on the piston face of the Apply piston head. By further vacuuming the second chamber, the entire ejector piston together with the preform is pulled further against the bottom of the preform holder and held there.
  • the vacuum can be regulated in a suitable manner.
  • the compressed air system is activated and a pressure is built up in the pressure chamber between the piston head and the bottom part of the preform holder, with which the displaceable piston head is moved outwards in order to eject the cooled preform from the preform holder.
  • a flange at the end of the piston pin determines the end position of the ejector piston.
  • This device ensures that the overpressure generated in the pressure chamber when the preforms are ejected does not drop independently of the acting adhesive forces and can be controlled in a simple manner.
  • the individual preforms are safely ejected with this device.
  • This device makes it possible for the first time to control and regulate the pull-in and ejector forces in a suitable manner.
  • the preform can also be actively cooled in the sprue area with the ejector device according to the invention.
  • this surface can be coated with a particularly suitable non-stick layer.
  • the pressure chamber moving the piston is configured in a ring shape and that the piston pin has a flange at its base plate end to limit the piston stroke.
  • the individual preform holders each have an outer tubular cylinder sleeve and an inner cup-shaped cylinder sleeve, this cylinder sleeve being provided on the bottom side with a base part which is inserted into a recess in the base plate can. This base part will secured against rotation by means of positioning pins on the base plate.
  • the cylinder sleeve of the preform holder has a base plate such that the base part of the cylinder liner can be held in the recess of the base plate with the aid of this base plate.
  • FIG. 1 shows a longitudinal section through a preform holder according to the invention in the plane of the compressed air system
  • FIG. 3 shows a cross section through the supply plate of the removal device according to the invention
  • Fig. 5 is a plan view of the only partially loaded removal plate.
  • FIG. 1 A large number of preform holders 1 are applied to a base plate 2.
  • a base plate 2 Here is a cup-shaped
  • Cylinder liner 3 with its base part inserted into a corresponding recess 4 in base plate 2 and positioned with the aid of a positioning pin 5 such that supply lines 6 of the compressed air supply system are connected to a compressed air duct 7 provided in cylinder liner 3.
  • a tubular cylinder sleeve 8 Around the cup-shaped cylinder liner 3 there is a tubular cylinder sleeve 8, which has a base plate 9, which is fastened by means of screws 10 to the base plate 2.
  • the base part 33 of the cylinder liner 3 is held in the recesses 4 of the base plate 2.
  • Recesses 11 are provided between cylinder sleeve 3 and cylinder sleeve 8, in which a coolant can circulate.
  • the shape of the inner wall 12 of the cylinder liner 3 corresponds to the design of the outer surface of the preforms to be produced and can be coated and tapered for easier removal.
  • the ejector device comprises an ejector piston 13 which is formed from a piston head 14 and a piston pin 15.
  • the piston head 14 runs in a pressure-tight manner in a cylindrical bottom space 16 of the cup-shaped cylinder liner 3. Between this piston head 14 and the bottom surface 17 of the bottom space 16, a pressure chamber 18 is formed, which communicates with the compressed air channel 7. It is understood that the piston end face 19 follows the shape of the preform to be produced.
  • the piston pin 15 provided on the piston head 14 also runs in a pressure-tight manner in a piston pin opening 20 of the base part 21 of the cup-shaped cylinder liner 3 and projects into a vacuum chamber 22 which is connected to a vacuum system (not shown).
  • a central bore in the ejector piston 13 creates the connection between the vacuum system and the interior of the preform holder and thereby allows the preforms to be drawn in with the aid of the vacuum system.
  • the pressure chamber 18 is pressurized via the compressed air channel 7 and the ejector piston 13 is thereby moved in the direction of the opening of the preform holder.
  • the pressure-tight guidance of the piston head 14 and piston pin 15 prevents compressed air from escaping during this ejection movement.
  • a flange 23 in the form of a ring attached to the piston pin 15 in the vacuum chamber 22 defines the maximum stroke of the ejector piston 13.
  • Supply plate 27 for supplying the negative and positive pressure systems and the cooling system.
  • This figure makes it clear that three batches can be cooled one after the other with the removal device, in which only every third preform holder 1 for receiving a preform 24 interacts or interacts with the vacuum system. only every third preform holder 1 interacts with the overpressure system for the ejection process.
  • a preferred embodiment of the removal device has twelve rows arranged one behind the other, as shown in FIG. 2, and is therefore suitable for the simultaneous removal of 48 preforms.
  • FIG. 3 shows the geometrical arrangement of the compressed air lines and their connection to the respective pressure chambers 18 of the preform holder 1.
  • the supply plate 27 leads to three independent channel systems, for the vacuum 29, for the overpressure 30 and for the cooling 31 This figure makes it clear that in each case three preform holders must be connected independently of one another to the corresponding supply lines in order to enable their independent control.
  • FIG. 4 shows two preform holders 1 which are arranged next to one another and whose ejector devices are in different working positions.
  • the section shown runs transversely to the cross section shown in FIG. 1 and shows, in contrast, the connection of the coolant channels 31 to the recesses 11 provided for cooling the cylinder liner 3, and a connection 25 between the vacuum channel 29 and the vacuum chamber 22.
  • the piston head 14 of the ejector piston 13 lies on the bottom surface 17 of the bottom part 21 of the cup-shaped cylinder liner 3.
  • the associated piston pin 15 projects completely through the piston pin opening 20 into the vacuum chamber 22.
  • the pressure chamber 18 is designed as an annular chamber and is connected to the compressed air system (not shown).
  • the piston end face 19 conforms to the outer shape of the preform 24. Due to the flat guidance of the ejector piston 13, this transfers the heat absorbed by the preform 24 directly to the cooled cylinder liner 3 and thus actively supports the cooling of the hot preform 24 in the sprue area.
  • the ejector piston 13 is therefore preferably made of a material with high thermal conductivity. The vacuum generated in the vacuum chamber 22 is maintained during the cooling phase.
  • the vacuum in the vacuum chamber 22 is reduced and the pressure chamber 18 is pressurized. This pushes the ejector piston 13 against the opening of the preform holder 1.
  • the end position of the ejector piston 13 is preferably fixed by a flange 23.
  • FIG. 5 shows a top view of a removal plate which is only partially equipped with preform holders 1.
  • the arrangement and attachment of the foot plates 9 connected to the cylinder sleeves 8 can be seen from this.
  • the bore 26, which is connected to the interior of the cylinder liner 3 and the vacuum chamber 22, is arranged centrally in this exemplary embodiment.
  • the compressed air channel 7 ends in the periphery of the bottom surface 17 and is thus in connection with the annular pressure chamber 18 formed by the piston head.
  • the bores 32 for the supply and discharge of the coolant are centrally opposite one another. Perpendicular for this purpose, the recesses for the positioning pins 5 are provided.
  • the embodiment shown of the removal plate according to the invention has twelve rows of twelve preform holders 1 and is therefore suitable for removing preforms from a 48-cavity mold. More preferred
  • this ejector device can also be used with removal plates with more than 48 preform holders.
  • This device allows the preform holder to be arranged in any desired manner and is therefore suitable for molds of all kinds.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Robotics (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

L'invention concerne un dispositif éjecteur pour un système de déchargement approprié pour l'enlèvement de préformes, au moyen duquel une préforme partiellement refroidie est retirée de façon sûre d'un outil de formage et, après refroidissement complet, est éjectée, également de façon sûre et complète du dispositif et déchargement.
EP97923707A 1996-06-11 1997-06-10 Dispositif ejecteur Ceased EP0907488A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH145596 1996-06-11
CH1455/96 1996-06-11
PCT/CH1997/000231 WO1997047459A1 (fr) 1996-06-11 1997-06-10 Dispositif ejecteur

Publications (1)

Publication Number Publication Date
EP0907488A1 true EP0907488A1 (fr) 1999-04-14

Family

ID=4210873

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97923707A Ceased EP0907488A1 (fr) 1996-06-11 1997-06-10 Dispositif ejecteur

Country Status (5)

Country Link
US (1) US6190157B1 (fr)
EP (1) EP0907488A1 (fr)
JP (1) JP2000511837A (fr)
CA (1) CA2257986A1 (fr)
WO (1) WO1997047459A1 (fr)

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ITRM20010138A1 (it) 2001-03-16 2002-09-16 Sipa Spa Dispositivo e metodo per il raffreddamento e il condizionamento termico di un oggetto tubolare.
US6767497B2 (en) * 2001-11-20 2004-07-27 Wentworth Mold, Inc., Electra Form Industries Division Robotic parison handling method and apparatus
DE10215722B4 (de) * 2002-04-10 2009-11-26 Husky Injection Molding Systems Ltd., Bolton Verfahren und Vorrichtung zur Bearbeitung von Vorformlingen
US6848900B2 (en) * 2002-07-13 2005-02-01 Husky Injection Molding Systems Ltd. Apparatus for handling injection molded preforms
US6737007B2 (en) * 2002-09-19 2004-05-18 Husky Injection Molding Systems, Ltd Cooling tube with porous insert
US7104779B2 (en) * 2002-12-20 2006-09-12 Husky Injection Molding Systems, Ltd. Suction sleeve extension for a take-off device
US7264464B2 (en) * 2003-06-09 2007-09-04 Husky Injection Molding Systems Ltd. Cooling tube with a low friction coating
US7252497B2 (en) * 2005-03-10 2007-08-07 Husky Injection Molding Systems Ltd. Post-molding molded article conditioning apparatus with a selectively controlled transfer flow structure
US7293980B2 (en) * 2005-03-10 2007-11-13 Husky Injection Molding Systems Ltd. Porous member for a post-molding molded article conditioning apparatus with an integrally formed cooling structure
US7326046B2 (en) * 2005-03-10 2008-02-05 Husky Injection Molding Systems Ltd. Multi-layer porous member for a post-molding molded article conditioning apparatus
US7802980B2 (en) 2007-04-18 2010-09-28 Husky Injection Molding Systems Ltd. System, method and apparatus for configuring an end of arm tool in a molding system
US20070264384A1 (en) * 2006-05-12 2007-11-15 Husky Injection Molding Systems Ltd. Molded article holder
US20080166209A1 (en) * 2007-01-10 2008-07-10 Husky Injection Molding Systems Ltd. Molded Article Picker
GB2445933A (en) * 2007-01-23 2008-07-30 Atm Automation Ltd Handling system for moulded parts
US7780884B2 (en) * 2007-08-20 2010-08-24 Husky Injection Molding Systems Ltd. Method for post-mold treatment of a molded article and an apparatus for implementing the method
US20110193266A1 (en) * 2008-09-29 2011-08-11 Bridgestone Corporation Method of producing injection-molded article and mold for injection molding
KR101164446B1 (ko) 2010-04-06 2012-07-12 페트원 주식회사 사출성형기용 프리폼 취출 냉각장치
DE102011007553A1 (de) * 2011-04-15 2012-10-18 Mht Mold & Hotrunner Technology Ag Kühlhülse mit Stützelement
AT12805U1 (de) * 2011-07-14 2012-12-15 Engel Austria Gmbh Temperiermedienverteiler
WO2016008928A1 (fr) * 2014-07-17 2016-01-21 Sacmi Imola S.C. Dispositif pour le déchargement et le stockage de préformes pour la production de récipients en plastique
WO2017031589A1 (fr) * 2015-08-25 2017-03-02 Athena Automation Ltd. Ensemble plaque de refroidissement pour une machine de moulage par injection
EP3680084B1 (fr) * 2017-09-08 2022-11-02 Nissei Asb Machine Co., Ltd. Moule
IT201900012966A1 (it) * 2019-07-26 2021-01-26 Sacmi Imola Sc Procedimento e impianto per la produzione di preforme.
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Also Published As

Publication number Publication date
WO1997047459A1 (fr) 1997-12-18
CA2257986A1 (fr) 1997-12-18
US6190157B1 (en) 2001-02-20
JP2000511837A (ja) 2000-09-12

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