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WO1996006721A1 - Extrudeuse comportant un systeme de vis sans fin - Google Patents

Extrudeuse comportant un systeme de vis sans fin Download PDF

Info

Publication number
WO1996006721A1
WO1996006721A1 PCT/CH1995/000182 CH9500182W WO9606721A1 WO 1996006721 A1 WO1996006721 A1 WO 1996006721A1 CH 9500182 W CH9500182 W CH 9500182W WO 9606721 A1 WO9606721 A1 WO 9606721A1
Authority
WO
WIPO (PCT)
Prior art keywords
extruder
screw
screws
housing
pressure
Prior art date
Application number
PCT/CH1995/000182
Other languages
German (de)
English (en)
Inventor
Josef Manser
Christian Millauer
Heinz Resch
Original Assignee
Bühler 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 Bühler AG filed Critical Bühler AG
Priority to EP95926827A priority Critical patent/EP0777565A1/fr
Publication of WO1996006721A1 publication Critical patent/WO1996006721A1/fr

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
    • 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
    • B29C48/256—Exchangeable extruder parts
    • B29C48/2561—Mounting or handling of the screw
    • 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

Definitions

  • the invention relates to an extruder with a screw extension device according to the preamble of claim 1.
  • extrusion of food and other goods is increasingly used due to the economic advantages.
  • extruders like screw machines and pasta presses, are subject to very high requirements with regard to Sa ⁇ nitation of the product-carrying parts.
  • the necessary cleaning of the product-carrying parts requires the extruder screws to be removed (analogously in the case of replacement due to wear). This takes place by pulling out or ejecting the screws or by moving down or opening the screw housing with a high level of equipment and / or space.
  • a push rod is connected to the hydraulic piston of a screw adjusting device by means of a mechanical coupling, the coupling taking the push rod only in the screw ejection direction.
  • the push rod is provided with drivers, the distance of which corresponds approximately to the piston stroke. The screw is ejected from the cylinder in several strokes, the increasing free cantilever length is not supported.
  • GB-A-893597 discloses an extrusion device in which the screws can be ejected and cooled.
  • the ejection of the screw requires a hollow shaft through the gearbox to receive the ejection shaft.
  • the ejection mechanism is arranged behind the extruder in the axial direction, which results in long overall lengths.
  • FR-A-11266221 Such solutions are no longer practical in the planetary gears used today, so that the extrusion press cylinders are at least partially dismantled and the screws are then removed.
  • a device for extruding plastic masses allows the die plate to be lifted off. This is done by means of a hydraulic pressure counteracting the spring force of a tension spring.
  • the die plate sits on the piston rods and can be released in a pivoted-out position.
  • the die plate, a traverse and pressure medium cylinders arranged between them form a kind of frame which absorbs the pressures that occur and guides them into the bearing blocks. The latter in turn can be supported on the outer rings of the housing sections of the extruder.
  • the invention is therefore based on the object of further developing a generic extruder with a screw removal device in such a way that the extrusion or extraction of the extruder screws is considerably simplified.
  • This object is achieved with the characterizing features of claim 1.
  • either the gear is moved forward or the housing of the extruder is pulled back in order to expose the screw of the extruder completely or at least partially.
  • the invention is described in more detail in an exemplary embodiment with reference to a drawing. In the drawing they show
  • Fig. 1 the screw removal device by means of a movable gear (detail)
  • Fig. 2 the screw removal device by means of a retractable housing of the extruder (detail).
  • a twin-shaft extruder (FIG. 1) contains a displaceably mounted gear 1 and a pressure cylinder 2 with piston rods 3.
  • the piston rods 3 are connected to the fixed extruder housing 5 and a housing plate 15.
  • the gear 1 with the extruder screws 9 coupled to it is first moved forward by actuating the pressure cylinders 2, the screw coupling 4 is released and the gear 1 is moved back again.
  • a pressure piece 6 is then inserted between the screw coupling 4 and the end faces of the extruder screws 9 on the gearbox side.
  • the pressure piece 6 is adapted to the contour of the bore 7 receiving the extruder screws.
  • the extruder screws are now ejected from the bore 7 of the extruder housing 5 in accordance with the length dimension of the pressure piece 6.
  • the extruder screws 9 are further ejected. It is advantageous to enclose the head pieces of the extruder screws during the ejection process by counterparts (not shown) and thus to protect them.
  • the die 13 is pivoted out in the usual way before the ejection process begins.
  • twin-screw extruder (FIG. 2) is provided with an axially parallel clamping tool 8 which is mounted on a granulating device 14.
  • the granulating device 14 is first pushed to the side, then the die 13 is pivoted out and then the extruder housing 5 is withdrawn by means of the pressure cylinder 11. As a result, the extruder screws 9 protrude from the extruder housing 5. The extruder housing 5 with the above extruder screws 9 is now moved forward again. Then the, on the granulating device 14 longitudinally displaceable clamping tool 8 to the push rods 10, z. B. coupled by means of grip screws 16. The push rods 10 are firmly connected to the fixed gear 1.
  • the clamping tool 8 now includes, for. B. with a Spannhydrau ⁇ lik the extruder screws 9 on the outer diameter. Subsequently, the extruder housing 5 is withdrawn via the pressure cylinders 11, the extruder screws 9, however, stopping due to the activated clamping tool 8 and the fixed pressure rods 10, and thus the pressure cylinders 11 are "pulled” out of the extruder housing 5 by the respective amount of a stroke. This process is repeated until the extruder screws 9 protrude completely from the extruder housing 5.
  • the particular advantage of the solution according to the invention is that the overall length of the extruder arrangement remains virtually unchanged and the expenditure in terms of apparatus and time for the screw removal is comparatively low.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne une extrudeuse qui comporte un système de vis sans fin s'utilisant notamment dans les extrudeuses pour produits alimentaires ou similaires. Afin de simplifier la structure de vis sans fin (9) d'extrudeuses, le mécanisme de transmission (1) et/ou le carter (5) de l'extrudeuse sont montés déplaçables dans le sens axial. Le déplacement s'effectue au moyen de cylindres compresseurs (2) et de tiges de piston (3), une fois la vis sans fin (9) désaccouplée du mécanisme de transmission (1).
PCT/CH1995/000182 1994-08-31 1995-08-16 Extrudeuse comportant un systeme de vis sans fin WO1996006721A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP95926827A EP0777565A1 (fr) 1994-08-31 1995-08-16 Extrudeuse comportant un systeme de vis sans fin

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2662/94-3 1994-08-31
CH266294 1994-08-31

Publications (1)

Publication Number Publication Date
WO1996006721A1 true WO1996006721A1 (fr) 1996-03-07

Family

ID=4238766

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH1995/000182 WO1996006721A1 (fr) 1994-08-31 1995-08-16 Extrudeuse comportant un systeme de vis sans fin

Country Status (2)

Country Link
EP (1) EP0777565A1 (fr)
WO (1) WO1996006721A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0976524A1 (fr) * 1998-07-25 2000-02-02 Bühler AG Extrudeuse
WO2010018062A3 (fr) * 2008-08-13 2010-05-06 Kraussmaffei Berstorff Gmbh Dispositif d'extrusion
EP2017063A3 (fr) * 2007-07-19 2013-05-22 SSD Parvex SAS Dispositif d'extrusion à moteur couple

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2090434A (en) * 1935-03-02 1937-08-17 Firm Gebruder Buhler Screw press for working plastic masses
GB946194A (en) * 1961-11-16 1964-01-08 Eckert & Ziegler Gmbh Injection unit for filling moulds of injection moulding machines
DE1268367B (de) * 1963-02-11 1968-05-16 Kloeckner Humboldt Deutz Ag Vorrichtung zum Ausstossen der Schnecke aus dem Presszylinder einer Schneckenstrangpresse
US4004787A (en) * 1975-01-10 1977-01-25 Usm Corporation Mixing and venting extruder
DE3331502A1 (de) * 1983-09-01 1985-03-21 Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover Vorrichtung zum ausziehen der schnecke aus einer auspress- oder homogenisierschneckenpresse

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2090434A (en) * 1935-03-02 1937-08-17 Firm Gebruder Buhler Screw press for working plastic masses
GB946194A (en) * 1961-11-16 1964-01-08 Eckert & Ziegler Gmbh Injection unit for filling moulds of injection moulding machines
DE1268367B (de) * 1963-02-11 1968-05-16 Kloeckner Humboldt Deutz Ag Vorrichtung zum Ausstossen der Schnecke aus dem Presszylinder einer Schneckenstrangpresse
US4004787A (en) * 1975-01-10 1977-01-25 Usm Corporation Mixing and venting extruder
DE3331502A1 (de) * 1983-09-01 1985-03-21 Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover Vorrichtung zum ausziehen der schnecke aus einer auspress- oder homogenisierschneckenpresse

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0976524A1 (fr) * 1998-07-25 2000-02-02 Bühler AG Extrudeuse
EP2017063A3 (fr) * 2007-07-19 2013-05-22 SSD Parvex SAS Dispositif d'extrusion à moteur couple
WO2010018062A3 (fr) * 2008-08-13 2010-05-06 Kraussmaffei Berstorff Gmbh Dispositif d'extrusion
CN102123843A (zh) * 2008-08-13 2011-07-13 克劳斯马菲贝斯托夫有限公司 挤出装置
US9108345B2 (en) 2008-08-13 2015-08-18 Kraussmaffei Berstorff Gmbh Extruding device

Also Published As

Publication number Publication date
EP0777565A1 (fr) 1997-06-11

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