DE549468C - Device for securing automatically operating injection molding machines against persistence of the injection pressure in the pressure chamber in the event of a machine failure - Google Patents

Device for securing automatically operating injection molding machines against persistence of the injection pressure in the pressure chamber in the event of a machine failure

Info

Publication number
DE549468C
DE549468C DENDAT549468D DE549468DD DE549468C DE 549468 C DE549468 C DE 549468C DE NDAT549468 D DENDAT549468 D DE NDAT549468D DE 549468D D DE549468D D DE 549468DD DE 549468 C DE549468 C DE 549468C
Authority
DE
Germany
Prior art keywords
pressure chamber
pressure
injection
molding machines
injection molding
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.)
Expired
Application number
DENDAT549468D
Other languages
German (de)
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.)
Mahle GmbH
Original Assignee
Elektronmetall GmbH
Publication date
Application granted granted Critical
Publication of DE549468C publication Critical patent/DE549468C/en
Expired 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
    • B29C45/84—Safety devices

Landscapes

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

Description

Vorrichtung für die Sicherung von automatisch arbeitenden Spritzgußmaschinen gegen Andauern des Spritzdruckes in der Druckkammer bei Versagen der Maschine Bei automatisch arbeitenden, insbesondere hydraulisch gesteuerten Spritzgußmaschinen, bei -denen wenigstens die Mehrzahl der Arbeitsgänge in zwangsläufiger Reihenfolge und in zwangsläufigen Zeitabständen, beispielsweise durch eine oder mehrere Nocken.scheibenwellen, betätigt bzw. ausgelöst wird, hat sich die Notwendigkeit herausgestellt, Vorkehrungen dagegen zti treffen, daß -bei plötzlichem Aussetzen der Maschine, insbesondere bei Versagen der für den Antrieb der Steuerung erforderlichen Kräfte in einem Zeitpunkt, in dem der Spritzdruck auf das in der Druckkammer befindliche Metall wirkt. dieser Druck längere Zeit hindurch in der Druckkammer erhalten bleibt, da ein solcher Zustand die Wandungen der Kammer in unzulässiger Weise beanspruchen würde.Device for securing automatic injection molding machines against persistence of the injection pressure in the pressure chamber if the machine fails automatically working, especially hydraulically controlled injection molding machines, in -whose at least the majority of the operations in an inevitable order and at unavoidable time intervals, for example by one or more cam, disk shafts, is actuated or triggered, it has become necessary to take precautions on the other hand zti hit that - if the machine stops suddenly, especially if Failure of the forces required to drive the control system at a point in time in which the spray pressure acts on the metal in the pressure chamber. this Pressure remains in the pressure chamber for a long time because of such a condition would unduly stress the walls of the chamber.

Durch die Vorrichtung gemäß Erfindung wird eine selbsttätige, d. h. von der Steuerung bzw. dem Antrieb der Maschine unabhängige Entlastung der Druckkammer in solchen Fällen ermöglicht. Die Vorrichtung ist an geeigneter Stelle in die Spritzdruckzuleitung zur Druckkammer oder in den nicht vom Metall erfüllten Teil der Druckkammer eingebaut. In einem Gehäuse a (vgl. die Abbildung) bewegt sich ein Schieberventil b, das während des Arbeitens der Maschine bzw. der Steuerung in einer Stellung gehalten wird, die die freie Verbindung zwischen der Spritzdruckleitung und der Druckkamrper gewährleistet. Beispielsweise wird das Ventil in dem in der Abbildung wiedergegebenen Fall in der betreffenden Stellung durch einen Elektromagneten c gehalten, der von .dem Antriebsstrom für den Nockenwellenmotor betätigt wird. Setzt aber der Antriebsstrom der Steuerung aus irgendeinem Grunde aus, so fällt das Schieberventil in seinem Gehäuse um eine Strecke, die durch den Anschlag d bestimmt ist. In dieser Stellung stellt das Ventil durch den Kanal e die Verbindung zwischen der Druckkammer und der Atmosphäre her, so daß die Druckkammer sofort entlastet wird, während andererseits gleichzeitig die Spritzdruckzuleitung blockiert ist.With the device according to the invention an automatic, i. H. Relief of the pressure chamber independent of the control or the drive of the machine in such cases. The device is at a suitable point in the injection pressure feed line to the pressure chamber or installed in the part of the pressure chamber that is not filled by the metal. In a housing a (see. The figure) moves a slide valve b, which during the operation of the machine or the control is held in a position that the free connection between the spray pressure line and the pressure chamber is guaranteed. For example, in the case shown in the figure, the valve is in the relevant position held by an electromagnet c, the .dem drive current for the camshaft motor is operated. But sets the drive current of the control for some reason, the slide valve falls one in its housing Distance determined by the stop d. The valve is in this position through channel e the connection between the pressure chamber and the atmosphere is established, so that the pressure chamber is relieved immediately, while on the other hand at the same time the injection pressure supply line is blocked.

Claims (1)

PATENTANSPRUCH: Vorrichtung für die Sicherung von automatisch arbeitenden, insbesondere hydraulisch gesteuerten Spritzgußmaschinen gegen Andauern des Spritzdruckes in der Druckkammer bei Versagen der Maschine, dadurch gekennzeichnet, daß in die Spritzdruckzuleitung zur Druckkammer ein Ventil eingebaut ist, das durch die die Maschine bzw. deren Steuerung antreibende Kraft in der Betriebsstellung gehalten wird, infolge Ausbleibens der Antriebskraft aber in eine Stellung rückt, die die- freie Verbindung zwischen der Druckkammer und der Atmosphäre herstellt und gleichzeitig die Spritzdruckzuleitung blockiert.PATENT CLAIM: Device for securing automatically operating, in particular hydraulically controlled injection molding machines against persistence of the injection pressure in the pressure chamber when the machine fails, characterized in that in the Injection pressure feed line to the pressure chamber, a valve is built in through which the Machine or its control kept driving force in the operating position is, however, due to the lack of driving force, moves into a position that Establishes free connection between the pressure chamber and the atmosphere and at the same time the injection pressure supply line blocked.
DENDAT549468D Device for securing automatically operating injection molding machines against persistence of the injection pressure in the pressure chamber in the event of a machine failure Expired DE549468C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE549468T

Publications (1)

Publication Number Publication Date
DE549468C true DE549468C (en) 1932-08-12

Family

ID=6562317

Family Applications (1)

Application Number Title Priority Date Filing Date
DENDAT549468D Expired DE549468C (en) Device for securing automatically operating injection molding machines against persistence of the injection pressure in the pressure chamber in the event of a machine failure

Country Status (1)

Country Link
DE (1) DE549468C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE849743C (en) * 1943-01-23 1952-09-18 Mahle Werk G M B H Die casting machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE849743C (en) * 1943-01-23 1952-09-18 Mahle Werk G M B H Die casting machine

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