WO2004069518A1 - Drive unit comprising hollow shaft motors for the injection unit of an injection molding machine - Google Patents

Drive unit comprising hollow shaft motors for the injection unit of an injection molding machine Download PDF

Info

Publication number
WO2004069518A1
WO2004069518A1 PCT/EP2004/000715 EP2004000715W WO2004069518A1 WO 2004069518 A1 WO2004069518 A1 WO 2004069518A1 EP 2004000715 W EP2004000715 W EP 2004000715W WO 2004069518 A1 WO2004069518 A1 WO 2004069518A1
Authority
WO
WIPO (PCT)
Prior art keywords
drive
hollow shaft
rotary drive
rotor
housing
Prior art date
Application number
PCT/EP2004/000715
Other languages
German (de)
French (fr)
Inventor
Georg Ickinger
Original Assignee
Demag Ergotech Gmbh
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 Demag Ergotech Gmbh filed Critical Demag Ergotech Gmbh
Publication of WO2004069518A1 publication Critical patent/WO2004069518A1/en

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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • B29C45/50—Axially movable screw
    • B29C45/5008—Drive means therefor
    • 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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • B29C45/50—Axially movable screw
    • B29C45/5008—Drive means therefor
    • B29C2045/5024—Drive means therefor screws rotated by the coaxial rotor of an electric motor
    • 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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • B29C45/50—Axially movable screw
    • B29C45/5008—Drive means therefor
    • B29C2045/5028—Drive means therefor screws axially driven by the coaxial rotor of an electric motor
    • 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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • B29C45/50—Axially movable screw
    • B29C45/5008—Drive means therefor
    • B29C2045/5032—Drive means therefor using means for detecting injection or back pressures
    • 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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • B29C45/50—Axially movable screw
    • B29C45/5008—Drive means therefor
    • B29C2045/504—Drive means therefor electric motors for rotary and axial movement of the screw being coaxial with the screw

Definitions

  • the invention relates to an injection unit for an injection molding machine, according to the preamble of claim 1 and 6 respectively.
  • the object of the invention is to design an injection unit of the type mentioned at the outset such that the design of the injection unit is substantially improved in a structurally simple manner, in particular with regard to the structural dimensions and the arrangement of the pressure sensor.
  • the total length of the injection unit, based on the effective screw stroke is considerably shortened and an extremely space-saving design is achieved.
  • the measuring accuracy of the effective screw pressure force is also significantly increased by the fact that the pressure sensor in connection with the axially limitedly movable arrangement of the rotor bearings of the rotary drive is positioned behind its housing in the direction of the lifting force, and accordingly measuring errors which are caused by friction and inertia Lifting movement of the rotary actuator housing have to be effectively eliminated in a structurally simple manner.
  • a particularly advantageous embodiment of the invention consists in that the spindle shaft of the spindle drive is firmly connected to the hollow shaft rotor of the linear drive and in the return stroke position of the plasticizing screw extends through the hollow shaft interior of the linear drive and into that of the rotary drive, while the spindle nut attached to the rotary drive on the housing side of the spindle drive engages in the hollow shaft interior of the linear drive.
  • Another, particularly preferred aspect of the invention relates to the design of the rotor bearing points. While large and correspondingly expensive precision bearings are required for an external mounting of the hollow shaft rotors, the required bearing diameter is expediently reduced considerably in that for the rotatable mounting of the hollow shaft rotor of the rotary drive, a housing-fixed, which engages in the hollow shaft interior and the rotor with interposition of the rotor bearings supporting sleeve is provided on its inner lateral surface, in that the gear element of the spindle drive rotating with the rotor of the linear drive, i.e.
  • the spindle shaft or the spindle nut can increasingly be inserted during the return stroke of the rotary drive, and / or that the hollow shaft rotor of the linear drive is also expediently provided, for reasons of a reduction in the size of the bearing, via an axially protruding from the closed rotor end , central bearing pin and bearings located between it and the motor housing is mounted on one side overhung.
  • a particularly easy-to-install arrangement of the rotary encoder required for measuring the angle of rotation of the rotary drive ultimately results from the fact that it is positioned between the closed rotor end and the support sleeve of the rotary drive fixed to the housing.
  • the injection unit of an injection molding machine which is otherwise not shown in detail in the drawing, contains as main components a plasticizing screw 2 arranged in a plasticizing cylinder 1 (of which only the rear sections are shown), as well as a rotary and a linear drive 3, 4 for the plasticizing screw 2 in mutually coaxial arrangement.
  • the rotary drive 3 is axially displaceably mounted on mutually parallel guide rails 5 which are fastened on the one hand to a support bridge 6 for the plasticizing cylinder 1 and on the other hand on the housing 7 of the linear drive 4.
  • Both drives 3 and 4 are designed as electric hollow shaft motors, the rotors 8, 9 of which are connected on one side by an end wall 10 and 11, respectively. locks and the open rotor ends are facing each other.
  • the hollow shaft rotor 9 is provided on its end wall 11 with a central bearing journal 12, via which, with the interposition of oppositely preloaded, longitudinal and transverse force-transmitting roller bearings 13, 14 on the housing 7 of the linear drive 4, but rotatable is supported axially immovable.
  • the rotor 8 of the rotary drive 3 is rotatably mounted on its inner circumferential surface on a support sleeve 16 which is fastened to the drive housing 15 and engages in the rotor interior, specifically via roller bearings 17, 18 which also transmit longitudinal and transverse force.
  • the angle of rotation of the rotor 8 and thus also of the plasticizing screw 2 which is firmly connected to the rotor end wall 10 is measured by a rotary encoder 19 which is arranged between the end wall 10 and the closed end of the support sleeve 16.
  • a ball screw drive designated overall by 20, is used, the spindle nut 21 of which is fixedly connected to the housing 15 of the rotary drive 3 in the region of the support sleeve 16 and in which Return stroke position of the rotary drive 3 shown in the drawing engages in the hollow shaft interior of the rotor 9, while the spindle shaft 22 fastened to the end wall 11 of the rotor 9 in this position has its free end from the support sleeve 16 in the hollow shaft interior of the rotor 8. is taken.
  • the thrust of the spindle drive 20 is transmitted from the spindle nut 21 via the housing 15, the rotor bearings 17, 18 and the rotor 8 of the rotary drive to the plasticizing screw 2.
  • the corresponding pressure sensor 23 is located behind the rotary drive housing 15 in the direction of the thrust force of the linear drive 4, namely between the latter and the Rotor bearings 17, 18 are positioned, the rotor 8 being axially displaceably supported on the support sleeve 16 via the bearings 17, 18. This ensures that the pressure sensor 23 is always subjected to the full screw pressure force.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

Disclosed is an injection unit for an injection molding machine, comprising an electromotive rotary drive unit (3) which drives the plasticizing screw (2) in the direction of rotation and is disposed so as to perform reciprocating movements along with said plasticizing screw (2), and an electromechanical linear drive unit (4) that encompasses a hollow shaft motor and a spindle drive (20) located downstream therefrom for driving the plasticizing screw and the rotary drive unit in a reciprocating manner. The plasticizing screw, the rotary drive unit, and the linear drive unit are arranged coaxial to each other. The design and mode of operation of the inventive injection unit are significantly improved by the fact that both driving motors are embodied as hollow shaft motors (3, 8 and 4, 9) that face each other with the open ends thereof while the spindle drive (20) is mounted in the common interior space of the hollow shafts of both hollow shaft motors. According to another aspect of the invention, the rotor (8) of the rotary drive unit (3) and the rotor bearings (17, 18) are disposed on the housing (15) of the rotary drive unit so as to be movable in an axially limited manner while a pressure sensor (23) which measures the compressive force of the screw is placed between the housing and the rotor bearings of the rotary drive unit so as to transduce the lifting power.

Description

ANTRIEBSEINHΞIT MIT HOHLWELLENMOTOREN FÜR DAS EINSPRITZAGGREGAT EINER SPRITZGIES SMASCHINEDRIVE UNIT WITH HOLLOW SHAFT MOTORS FOR THE INJECTION UNIT OF AN INJECTION MOLDING MACHINE
Die Erfindung bezieht sich auf ein Einspritzaggregat für eine Spritzgießmaschine, nach dem Oberbegriff des Patentanspruchs 1 bzw. 6.6. The invention relates to an injection unit for an injection molding machine, according to the preamble of claim 1 and 6 respectively.
Bei dem aus der US 6 309 203 B1 bekannten Einspritzaggregat dieser Art ist die Spindelmutter des Spindeltriebs fest mit dem Hohlwellenrotor des Linearantriebs verbunden, während die Spindelwelle unter Zwischenschaltung eines die Einspritzkraft messenden Drucksensors an dem auf Führungsholmen hubbeweglich und drehfest gelagerten Gehäuse des Drehantriebs befestigt ist. Bei diesem bekannten Einspritzaggregat ergibt sich aus der koaxialen Aneinanderreihung der Einzelkomponenten eine sehr große Gesamtbaulänge, und ferner wirken die bei der Hubbewegung unvermeidbar auftretenden Reibungs- und Trägheitskräfte des Drehantriebs verfälschend auf das Messergebnis des Drucksensors.In the injection unit of this type known from US Pat. No. 6,309,203 B1, the spindle nut of the spindle drive is firmly connected to the hollow shaft rotor of the linear drive, while the spindle shaft is fastened, with the interposition of a pressure sensor measuring the injection force, to the housing of the rotary drive which is mounted on guide rails and is non-rotatably mounted. In this known injection unit, the coaxial arrangement of the individual components results in a very large overall length, and furthermore the friction and inertial forces of the rotary drive, which inevitably occur during the stroke movement, have a falsifying effect on the measurement result of the pressure sensor.
Aufgabe der Erfindung ist es, ein Einspritzaggregat der eingangs genannten Art so auszubilden, dass auf konstruktiv einfache Weise die Bauart des Einspritzaggregats, insbesondere hinsichtlich der baulichen Abmessungen und der Anordnung des Drucksensors, wesentlich verbessert wird.The object of the invention is to design an injection unit of the type mentioned at the outset such that the design of the injection unit is substantially improved in a structurally simple manner, in particular with regard to the structural dimensions and the arrangement of the pressure sensor.
Diese Aufgabe wird erfindungsgemäß durch das im Patentanspruch 1 bzw. 6 gekennzeichnete Einspritzaggregat gelöst. Erfindungsgemäß wird durch die beanspruchte Ausbildung und gegenseitige Ausrichtung der Antriebsmotoren und die Einbeziehung des Spindeltriebs in die Grenzen beider Rotor-Innenräume die Gesamtlänge des Einspritzaggregats, bezogen auf den wirksamen Schneckenhub, erheblich verkürzt und so eine äußerst platzsparende Bauweise erreicht. Wahlweise oder zusätzlich wird erfindungsgemäß außerdem die Messgenauigkeit der effektiven Schneckendruckkraft dadurch deutlich erhöht, dass der Drucksensor in Verbindung mit der axial begrenzt beweglichen Anordnung der Rotorlager des Drehantriebs in Hubkraftrichtung hinter dessen Gehäuse positioniert ist und demgemäß Messfehler, die ihre Ursache in der reibungs- und trägheitsbehafteten Hubbewegung des Drehantriebsgehäuses haben, auf konstruktiv einfache Weise wirksam eliminiert werden.This object is achieved by the injection unit characterized in claim 1 or 6. According to the claimed design and mutual alignment of the drive motors and the inclusion of the spindle drive in the limits of both rotor interiors, the total length of the injection unit, based on the effective screw stroke, is considerably shortened and an extremely space-saving design is achieved. Optionally or additionally, according to the invention, the measuring accuracy of the effective screw pressure force is also significantly increased by the fact that the pressure sensor in connection with the axially limitedly movable arrangement of the rotor bearings of the rotary drive is positioned behind its housing in the direction of the lifting force, and accordingly measuring errors which are caused by friction and inertia Lifting movement of the rotary actuator housing have to be effectively eliminated in a structurally simple manner.
Eine besonders baugünstige Ausführungsform der Erfindung besteht darin, dass die Spindelwelle des Spindeltriebs fest mit dem Hohlwellenrotor des Linearantriebs verbunden ist und sich in der Rückhublage der Plastifizierschnecke durch den Hohlwellen-Innenraum des Linearantriebs und in den des Drehantriebs erstreckt, während die am Drehantrieb gehäuseseitig befestigte Spindelmutter des Spindeltriebs in den Hohlwellen-Innenraum des Linearantriebs eingreift.A particularly advantageous embodiment of the invention consists in that the spindle shaft of the spindle drive is firmly connected to the hollow shaft rotor of the linear drive and in the return stroke position of the plasticizing screw extends through the hollow shaft interior of the linear drive and into that of the rotary drive, while the spindle nut attached to the rotary drive on the housing side of the spindle drive engages in the hollow shaft interior of the linear drive.
Ein weiterer, besonders bevorzugter Aspekt der Erfindung bezieht sich auf die Gestaltung der Rotor-Lagerstellen. Während nämlich für eine Außenlagerung der Hohlwellenrotoren große und dementsprechend kostspielige Präzisionsla- ger benötigt werden, wird der erforderliche Lagerdurchmesser zweckmäßigerweise dadurch wesentlich verkleinert, dass zur drehbaren Lagerung des Hohlwellenrotors des Drehantriebs eine gehäusefeste, in den Hohlwellen- Innenraum eingreifende und den Rotor unter Zwischenschaltung der Rotorlager an seiner inneren Mantelfläche abstützende Traghülse vorgesehen ist, in die das mit dem Rotor des Linearantriebs umlaufende Getriebeelement des Spindeltriebs, also die Spindelwelle oder die Spindelmutter, beim Rückhub des Drehantriebs zunehmend einführbar ist, und/oder dass der Hohlwellenrotor des Linearantriebs ebenfalls aus Gründen einer Reduzierung der Lagergröße zweckmäßigerweise über einen vom verschlossenen Rotorende axial abstehenden, zentralen Lagerzapfen und zwischen diesem und dem Motorgehäuse angeordnete Lagerstellen einseitig fliegend gelagert ist.Another, particularly preferred aspect of the invention relates to the design of the rotor bearing points. While large and correspondingly expensive precision bearings are required for an external mounting of the hollow shaft rotors, the required bearing diameter is expediently reduced considerably in that for the rotatable mounting of the hollow shaft rotor of the rotary drive, a housing-fixed, which engages in the hollow shaft interior and the rotor with interposition of the rotor bearings supporting sleeve is provided on its inner lateral surface, in that the gear element of the spindle drive rotating with the rotor of the linear drive, i.e. the spindle shaft or the spindle nut, can increasingly be inserted during the return stroke of the rotary drive, and / or that the hollow shaft rotor of the linear drive is also expediently provided, for reasons of a reduction in the size of the bearing, via an axially protruding from the closed rotor end , central bearing pin and bearings located between it and the motor housing is mounted on one side overhung.
Eine besonders einbaugünstige Anordnung des zur Messung des Drehwinkels des Drehantriebs benötigten Drehgebers ergibt sich schließlich daraus, dass dieser zwischen dem verschlossenen Rotorende und der gehäusefesten Traghülse des Drehantriebs positioniert ist.A particularly easy-to-install arrangement of the rotary encoder required for measuring the angle of rotation of the rotary drive ultimately results from the fact that it is positioned between the closed rotor end and the support sleeve of the rotary drive fixed to the housing.
Die Erfindung wird nunmehr anhand eines Ausführungsbeispiels in Verbindung * mit der Zeichnung näher erläutert. Diese zeigt einen Längsschnitt eines Einspritzaggregats nach der Erfindung in stark schematisierter Darstellung.The invention will now be explained with reference to an embodiment in conjunction with the drawings *. This shows a longitudinal section of an injection unit according to the invention in a highly schematic representation.
Das in der Zeichnung dargestellte Einspritzaggregat einer ansonsten nicht näher gezeigten Spritzgießmaschine enthält als Hauptbestandteile eine in einem Plastifizierzylinder 1 angeordnete Plastifizierschnecke 2 (von denen jeweils nur die rückwärtigen Teilstücke dargestellt sind), sowie einen Dreh- und einen Linearantrieb 3, 4 für die Plastifizierschnecke 2 in zueinander koaxialer Anordnung. Der Drehantrieb 3 ist an zueinander parallelen Führungsholmen 5, welche einerseits an einer Tragbrücke 6 für den Plastifizierzylinder 1 und anderer- seits am Gehäuse 7 des Linearantriebs 4 befestigt sind, axial verschieblich gelagert.The injection unit of an injection molding machine, which is otherwise not shown in detail in the drawing, contains as main components a plasticizing screw 2 arranged in a plasticizing cylinder 1 (of which only the rear sections are shown), as well as a rotary and a linear drive 3, 4 for the plasticizing screw 2 in mutually coaxial arrangement. The rotary drive 3 is axially displaceably mounted on mutually parallel guide rails 5 which are fastened on the one hand to a support bridge 6 for the plasticizing cylinder 1 and on the other hand on the housing 7 of the linear drive 4.
Beide Antriebe 3 und 4 sind als elektrische Hohlwellenmotoren ausgebildet, deren Rotoren 8, 9 jeweils einseitig durch eine Stirnwand 10 bzw. 11 ver- schlössen und deren offenen Rotorenden einander zugekehrt sind. Um die Baugröße der Rotorlager zu reduzieren, ist der Hohlwellenrotor 9 an seiner Stirnwand 11 mit einem zentralen Lagerzapfen 12 versehen, über den er unter Zwischenschaltung gegensinnig vorverspannter, längs- und querkraftübertra- gender Wälzlager 13, 14 am Gehäuse 7 des Linearantriebs 4 drehbar, aber axial unverschieblich abgestützt ist. Aus dem gleichen Grund ist der Rotor 8 des Drehantriebs 3 auf seiner inneren Mantelfläche an einer am Antriebsgehäuse 15 befestigten und in den Rotor-Innenraum eingreifenden Traghülse 16 drehbar gelagert, und zwar über ebenfalls längs- und querkraftübertragende Wälzlager 17, 18.Both drives 3 and 4 are designed as electric hollow shaft motors, the rotors 8, 9 of which are connected on one side by an end wall 10 and 11, respectively. locks and the open rotor ends are facing each other. In order to reduce the size of the rotor bearings, the hollow shaft rotor 9 is provided on its end wall 11 with a central bearing journal 12, via which, with the interposition of oppositely preloaded, longitudinal and transverse force-transmitting roller bearings 13, 14 on the housing 7 of the linear drive 4, but rotatable is supported axially immovable. For the same reason, the rotor 8 of the rotary drive 3 is rotatably mounted on its inner circumferential surface on a support sleeve 16 which is fastened to the drive housing 15 and engages in the rotor interior, specifically via roller bearings 17, 18 which also transmit longitudinal and transverse force.
Der Drehwinkel des Rotors 8 und somit auch der mit der Rotor-Stirnwand 10 fest verbundenen Plastifizierschnecke 2 wird durch einen Drehgeber 19 gemessen, welcher zwischen der Stirnwand 10 und dem verschlossenen Ende der Traghülse 16 angeordnet ist.The angle of rotation of the rotor 8 and thus also of the plasticizing screw 2 which is firmly connected to the rotor end wall 10 is measured by a rotary encoder 19 which is arranged between the end wall 10 and the closed end of the support sleeve 16.
Zur Umsetzung der Drehbewegung des Rotors 9 in eine Hubbewegung des Drehantriebs 3 und demgemäß auch der Plastifizierschnecke 2 dient ein insgesamt mit 20 bezeichneter Kugelspindeltrieb, dessen Spindelmutter 21 im Be- reich der Traghülse 16 fest mit dem Gehäuse 15 des Drehantriebs 3 verbunden ist und in der in der Zeichnung dargestellten Rückhublage des Drehantriebs 3 in den Hohlwellen-Innenraum des Rotors 9 eingreift, während die an der Stirnwand 11 des Rotors 9 befestigte Spindelwelle 22 in dieser Position mit ihrem freien Ende von der Traghülse 16 im Hohlwellen-Innenraum des Rotors 8 auf- genommen wird. Durch den Einbau des Spindeltriebs 20 in den Grenzen beider Hohlwellen-Innenräume wird die Baulänge des Einspritzaggregats deutlich verkürzt. Die Schubkraft des Spindeltriebs 20 wird von der Spindelmutter 21 über das Gehäuse 15, die Rotorlagerung 17, 18 und den Rotor 8 des Drehantriebs an die Plastifizierschnecke 2 übertragen. Um bei der Messung der effektiven Schneckendruckkraft Messfehler, die ihre Ursache in der reibungs- oder träg- heitsbehafteten Hubbewegung des Drehantriebsgehäuses 15 haben, wirksam zu eliminieren, ist der entsprechende Drucksensor 23 in Schubkraftrichtung des Linearantriebs 4 hinter dem Drehantriebsgehäuse 15, nämlich zwischen diesem und den Rotorlagern 17, 18 positioniert, wobei der Rotor 8 über die Lager 17, 18 in engen Grenzen axial verschieblich an der Traghülse 16 abge- stützt ist. Auf diese Weise wird sichergestellt, dass der Drucksensor 23 stets mit der vollen Schneckendruckkraft beaufschlagt ist. To convert the rotary movement of the rotor 9 into a lifting movement of the rotary drive 3 and accordingly also of the plasticizing screw 2, a ball screw drive, designated overall by 20, is used, the spindle nut 21 of which is fixedly connected to the housing 15 of the rotary drive 3 in the region of the support sleeve 16 and in which Return stroke position of the rotary drive 3 shown in the drawing engages in the hollow shaft interior of the rotor 9, while the spindle shaft 22 fastened to the end wall 11 of the rotor 9 in this position has its free end from the support sleeve 16 in the hollow shaft interior of the rotor 8. is taken. By installing the spindle drive 20 within the limits of both hollow shaft interior spaces, the overall length of the injection unit is significantly shortened. The thrust of the spindle drive 20 is transmitted from the spindle nut 21 via the housing 15, the rotor bearings 17, 18 and the rotor 8 of the rotary drive to the plasticizing screw 2. In order to effectively eliminate measurement errors in the measurement of the effective screw pressure force, which are due to the frictional or inertial stroke movement of the rotary drive housing 15, the corresponding pressure sensor 23 is located behind the rotary drive housing 15 in the direction of the thrust force of the linear drive 4, namely between the latter and the Rotor bearings 17, 18 are positioned, the rotor 8 being axially displaceably supported on the support sleeve 16 via the bearings 17, 18. This ensures that the pressure sensor 23 is always subjected to the full screw pressure force.

Claims

Patentansprüche claims
1. Einspritzaggregat für eine Spritzgießmaschine, mit einem elektromotorischen, die Plastifizierschnecke (2) in Drehrichtung antreibenden und gemeinsam mit dieser hubbeweglich angeordneten Drehantrieb (3) sowie einem elektromechanischen Linearantrieb (4) einschließlich eines Hohlwellenmotors und eines diesem nachgeschalteten Spindeltriebs (20) zum Hubantrieb der Plastifizierschnecke und des Drehantriebs, wobei die Plastifizierschnecke, der Drehantrieb und der Linearantrieb ko- axial zueinander angeordnet sein, dadurch gekennzeichnet, dass beide Antriebsmotoren als mit ihren offenen Enden einander zugekehrte Hohlwellenmotoren (3, 8 u. 4, 9) ausgebildet sind und der Spindeltrieb (20) im gemeinsamen Hohlwellen-Innenraum beider Hohlwellenmotoren untergebracht ist.1. Injection unit for an injection molding machine, with an electromotive, which drives the plasticizing screw (2) in the direction of rotation and together with this arranged in a movable manner, a rotary drive (3) as well as an electromechanical linear drive (4) including a hollow shaft motor and a spindle drive (20) connected downstream for lifting the Plasticizing screw and the rotary drive, the plasticizing screw, the rotary drive and the linear drive being arranged coaxially to one another, characterized in that both drive motors are designed as hollow shaft motors (3, 8 and 4, 9) facing one another with their open ends, and the spindle drive (20) is housed in the common hollow shaft interior of both hollow shaft motors.
2. Einspritzaggregat nach Anspruch 1 , dadurch gekennzeichnet, dass die Spindelwelle (22) des Spindeltriebs (20) fest mit dem Hohlwellenrotor (9) des Linearantriebs (4) verbunden ist und sich in der Rückhublage der Plastifizierschnecke (2) durch den Hohlwellen-Innenraum des Line- arantriebs und in den des Drehantriebs (3) erstreckt, während die am2. Injection unit according to claim 1, characterized in that the spindle shaft (22) of the spindle drive (20) is fixedly connected to the hollow shaft rotor (9) of the linear drive (4) and in the return stroke position of the plasticizing screw (2) through the hollow shaft interior of the linear drive and in that of the rotary drive (3), while the am
Gehäuse (15) des Drehantriebs (3) befestigte Spindelmutter (21) des Spindeltriebs in den Hohlwellen-Innenraum des Linearantriebs eingreift. Housing (15) of the rotary drive (3) attached spindle nut (21) of the spindle drive engages in the hollow shaft interior of the linear drive.
3. Einspritzaggregat nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass zur drehbaren Lagerung des Hohlwellenrotors (8) des Drehantriebs (3) eine gehäusefeste, in den Hohlwellen-Innenraum eingreifende und den ι Rotor unter Zwischenschaltung von Lagerstellen (17, 18) an seiner inneren Mantelfläche abstützende Traghülse (16) vorgesehen ist, in die das mit dem Rotor (9) des Linearantriebs (4) umlaufende Getriebeelement (22) des Spindeltriebs (20) beim Rückhub des Drehantriebs (3) zunehmend einführbar ist.3. Injection unit according to claim 1 or 2, characterized in that for the rotatable mounting of the hollow shaft rotor (8) of the rotary drive (3) a housing-fixed, engaging in the hollow shaft interior and the ι rotor with the interposition of bearings (17, 18) on it supporting sleeve (16) is provided, into which the gear element (22) of the spindle drive (20) rotating with the rotor (9) of the linear drive (4) can be inserted increasingly during the return stroke of the rotary drive (3).
I. Einspritzaggregat nach Anspruch 3, dadurch gekennzeichnet, dass der Drehantrieb (3) einen zwischen der gehäusefesten Traghülse (16) und dem verschlossenen Rotorende wirkenden Drehgeber (19) enthält.I. Injection unit according to claim 3, characterized in that the rotary drive (3) contains a rotary encoder (19) acting between the housing-fixed support sleeve (16) and the closed rotor end.
5. Einspritzaggregat nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Hohlwellenrotor (9) des Linearantriebs (4) über einen vom verschlossenen Rotorende axial abstehenden, zentralen Lagerzapfen (12) und zwischen diesem und dem Motorgehäuse (7) angeordnete Lager- stellen (13, 14) einseitig fliegend gelagert ist.5. Injection unit according to one of the preceding claims, characterized in that the hollow shaft rotor (9) of the linear drive (4) via a central bearing pin (12) projecting axially from the closed rotor end and between the bearing and the motor housing (7) arranged bearing points ( 13, 14) is overhung on one side.
6. Einspritzaggregat für eine Spritzgießmaschine, insbesondere nach Anspruch 1, mit einem elektromotorischen Drehantrieb (3) einschließlich eines drehbar, aber kraftübertragend am Gehäuse (15) des Drehantriebs abgestützten, die Plastifizierschnecke (2) in Drehrichtung antreibenden und mit dieser hubfest verbundenen Rotors (8), und mit einem elektromotorischen Linearantrieb (4) zum Hubantrieb der Plastifizierschnecke und des Rotors (8) unter Zwischenschaltung des Gehäuses des Drehantriebs sowie mit einem zwischen Linearantrieb und Plastifizierschne- cke angeordneten, hubkraftmessenden Drucksensor (23), dadurch gekennzeichnet, dass der Rotor (8) einschließlich der Rotorlagerung (17, 18) axial begrenzt bewegilich am Gehäuse (15) des Drehantriebs (3) angeordnet und der Drucksensor (23) hubkraftübertragend zwischen Gehäuse und Rotorlagerung des Drehantriebs positioniert ist. 6. Injection unit for an injection molding machine, in particular according to claim 1, with an electromotive rotary drive (3) including a rotatable but force-transmitting support on the housing (15) of the rotary drive, which drives the plasticizing screw (2) in the direction of rotation and is connected to this in a lift-resistant manner ), and with an electromotive linear drive (4) for stroke drive of the plasticizing screw and the rotor (8) with the interposition of the housing of the rotary drive, and with a between the linear drive and plasticizing screw arranged, lifting force measuring pressure sensor (23), characterized in that the rotor (8) including the rotor bearing (17, 18) axially movable on the housing (15) of the rotary drive (3) and the pressure sensor (23) transmitting lifting force between the housing and Rotor bearing of the rotary drive is positioned.
PCT/EP2004/000715 2003-02-05 2004-01-28 Drive unit comprising hollow shaft motors for the injection unit of an injection molding machine WO2004069518A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10304577.5 2003-02-05
DE2003104577 DE10304577A1 (en) 2003-02-05 2003-02-05 Injection unit for an injection molding machine

Publications (1)

Publication Number Publication Date
WO2004069518A1 true WO2004069518A1 (en) 2004-08-19

Family

ID=32841595

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2004/000715 WO2004069518A1 (en) 2003-02-05 2004-01-28 Drive unit comprising hollow shaft motors for the injection unit of an injection molding machine

Country Status (3)

Country Link
AT (1) AT8284U1 (en)
DE (1) DE10304577A1 (en)
WO (1) WO2004069518A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114953373A (en) * 2021-02-26 2022-08-30 住友重机械工业株式会社 Injection molding machine
EP4034364A4 (en) * 2019-09-26 2023-10-25 Milacron LLC Injection apparatus and related methods

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7500469B2 (en) * 2021-02-26 2024-06-17 住友重機械工業株式会社 Injection molding machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61140363A (en) * 1984-12-13 1986-06-27 Toshiba Mach Co Ltd Motor-driven injection molding machine
JP2000351139A (en) * 1999-06-14 2000-12-19 Sumitomo Heavy Ind Ltd Method for detecting back pressure of injection molding machine, and its apparatus
JP2001088180A (en) * 1999-09-22 2001-04-03 Nissei Plastics Ind Co Injection molding machine
EP1162053A2 (en) * 2000-06-07 2001-12-12 Krauss-Maffei Kunststofftechnik GmbH Injection unit for an injection moulding machine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0839631A (en) * 1994-07-29 1996-02-13 Sumitomo Heavy Ind Ltd Injection device of electromotive injection molding machine
JP3140997B2 (en) * 1998-03-27 2001-03-05 住友重機械工業株式会社 Injection device of electric injection molding machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61140363A (en) * 1984-12-13 1986-06-27 Toshiba Mach Co Ltd Motor-driven injection molding machine
JP2000351139A (en) * 1999-06-14 2000-12-19 Sumitomo Heavy Ind Ltd Method for detecting back pressure of injection molding machine, and its apparatus
JP2001088180A (en) * 1999-09-22 2001-04-03 Nissei Plastics Ind Co Injection molding machine
EP1162053A2 (en) * 2000-06-07 2001-12-12 Krauss-Maffei Kunststofftechnik GmbH Injection unit for an injection moulding machine

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 0103, no. 36 (M - 535) 14 November 1986 (1986-11-14) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 15 6 April 2001 (2001-04-06) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 21 3 August 2001 (2001-08-03) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4034364A4 (en) * 2019-09-26 2023-10-25 Milacron LLC Injection apparatus and related methods
CN114953373A (en) * 2021-02-26 2022-08-30 住友重机械工业株式会社 Injection molding machine

Also Published As

Publication number Publication date
AT8284U1 (en) 2006-05-15
DE10304577A1 (en) 2004-10-21

Similar Documents

Publication Publication Date Title
EP1414636B1 (en) Electromechanical linear drive
EP2353777B1 (en) Self-centring support
EP1655513B1 (en) Positioning device
EP0655358A1 (en) Apparatus for adjusting piece parts of a vehicle between two end positions
DE102004058686A1 (en) Power tool with a drive that can be switched over between the operating modes drilling, impact drilling, and chiseling
EP1447201B1 (en) Injection unit for an injection moulding machine
DE10221241A1 (en) Steering device for a motor vehicle steered by a steer-by-wire device has a steering wheel, an electric drive and a device for generating a steering haptic device to act on the steering wheel
DE202009015840U1 (en) linear actuator
DE102004054836B4 (en) Electric pressing device
AT8284U1 (en) DRIVE UNIT WITH HOISTWAVE ENGINES FOR THE INJECTION UNIT OF AN INJECTION MOLDING MACHINE
DE602004000462T2 (en) Actuator with two operating modes
DE2539439A1 (en) MOTOR VIBRATING DRIVE FOR ONE SHAFT
DE10213679A1 (en) Injection unit for an injection molding machine
DE102010002569A1 (en) Steering gear for rack-and-pinion steering of electric power-assisted steering system utilized in motor vehicle, has radially movable pretensioning unit for pretensioning worm wheel towards worm and/or groove towards gear teeth of gear rod
DE19517892C2 (en) Edge grinding machine for eyeglass lenses
DE20321036U1 (en) Injection unit for an injection molding machine has hollow shaft drive motors for rotational and axial drives facing each other with a spindle drive system in an internal chamber of both motors
DE102006007581A1 (en) Traversing drive of a cylinder of a printing machine
AT503393B1 (en) TWO PLATE CLOSING
EP1856421B1 (en) Aerostatic bearing comprising a pivotally supported bearing foot and bearing coupling
DE19943709C2 (en) Precision injection unit
DE602004004240T2 (en) Steering unit for an electric vehicle
DE19710557C1 (en) Electric motor and worm drive unit e.g. for motor vehicle windows, seats and wiper blade components
DE69303519T2 (en) Head bearing structure for rotating support of shafts and the like
DE102019114743A1 (en) DEVICE FOR MIXING TWO OR MORE COMPONENTS AND METHOD FOR CALIBRATING SUCH
DE102007015338A1 (en) Electromechanical steering system i.e. rack and pinion steering system, for motor vehicle i.e. passenger car, has tie-rod articulation projecting into recess in stop position of system, so that articulation is radially surrounded by bearing

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

DPEN Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed from 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase