• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Injection unit for a molding machine comprising a plasticizing cylinder (21) having a collar (22) and a support member (11) having a trough (13), the plasticizing cylinder (21) being disposed in the trough (13) and wherein an axial movement of the plasticizing cylinder (21) relative to the carrier part (11) is positively restrained by abutment of the collar (22) on the carrier part (11), and a clamping element (23) fastened or molded on the plasticizing cylinder (21) by means of fastening elements (24) attached to the carrier part (11) is that the plasticizing cylinder (21) between the trough (13) and the clamping element (23) is braced, wherein the plasticizing cylinder (21) by means of clamping elements (12) against lifting of the collar (22) from Carrier part (11) is clamped in an axial direction of the plasticizing cylinder (21).
    公开号:AT518638A4
    申请号:T50854/2016
    申请日:2016-09-23
    公开日:2017-12-15
    发明作者:Ing Florian Porod Dipl；Paul Riener Ing；Ing Richard Czepl Dipl；Dipl Ing Günter Schott (Fh)
    申请人:Engel Austria Gmbh；
    IPC主号:
    专利说明:

    The present invention relates to an injection unit for a molding machine having the features of the preamble of claim 1 and a method for assembling a plasticizing cylinder to a support part of an injection unit for a molding machine.
    Shaping machines may preferably be injection molding machines. But also injection presses, presses and the like are conceivable.
    The required injection pressure, for example in an injection molding process can be achieved by pressing a plasticizing screw with great force into the plasticizing cylinder and thus exerting the required pressure on the mass cushion. By this force, the plasticizing cylinder is subjected to train and there is an expansion in the axial direction. This makes it necessary to lock the plasticizing cylinder relative to a carrier part.
    This locking can be achieved by a collar which rests on the support member and receives the force during injection by axial positive locking.
    Also known is a fastened to the plasticizing or molded clamping element, which is fastened by means of fastening elements on the support member, that the plasticizing cylinder between the trough and the clamping element - preferably lying - braced and thereby secured. By this clamping element those forces are absorbed in the prior art, which occur, for example, the screw retraction and pressing the plasticizing cylinder to a sprue bushing.
    The plasticizing cylinder is also referred to as a mass cylinder.
    For example, DE 36 37 885 A1 discloses an injection unit, wherein the plasticizing cylinder has a collar. The carrier part, on which the plasticizing cylinder is mounted, has a trough, wherein the plasticizing cylinder is arranged in the trough and wherein an axial movement of the pasting cylinder relative to the carrier part is positively restrained by abutment of the collar on the carrier part. The arrangement of the collar relative to the support member is such that the collar inhibits such movements of the plasticizing relative to the support member, which would be induced by the forces occurring during injection on the plasticizing.
    A disadvantage of the embodiment of DE 36 37 885 A1 is that the clamping elements must be relatively complex designed as a clamping cylinder. Forces normal to the direction of movement of the clamping cylinder cause high bending moments and have a negative effect on wear and tightness.
    Another construction of a locking of a plasticizing cylinder on the carrier part is known from EP 0 314 942 A1. The plasticizing cylinder is not arranged in a trough but passed through a hole in the carrier part. As a result, a plasticizing cylinder, for example balanced on a crane, can not be inserted from above into the carrier part, which makes installation more difficult.
    In addition, this design is quite complex and another major disadvantage is that those parts that produce the positive locking during injection, are designed to be movable. The storage of such parts is naturally prone to wear and failure. A collar is used in this embodiment only as an abutment for the described positive locking means of moving parts.
    The object of the present invention is to specify an injection unit and a mounting method which, compared to the prior art, allow both a simplified design and a simplified assembly.
    With regard to the injection unit, this object is achieved by the features of claim 1. This is done by the plasticizing cylinder is clamped by means of clamping elements against lifting of the collar from the support member in an axial direction of the plasticizing. Neither complex clamping elements nor moving parts are necessary.
    This is done by the plasticizing cylinder is arranged in a trough of the support member is clamped by means of clamping elements against lifting of the Federal of the support member in an axial direction of the plasticizing and by means of fastening elements between a clamping element and the trough is tightened.
    As a result, a balanced suspended plasticizing can be arranged from above in the trough and manipulated and mounted in the simplest way.
    The collar locks preferably against forces that occur during injection. That is, by the injection (ie by the advance of a plasticizing arranged in the plasticizing screw or an injection piston), by the viscosity of the melt and by the pressure of the melt, which rises to its maximum during the injection process, creates a force which is an elongation of the plasticizing causes. The interlocking locking by means of the - preferably fixedly connected to the plasticizing - Federal causes a secure locking against the high axial forces occurring during the injection without moving parts.
    The clamping elements according to the invention take - supported by the frictional engagement between clamping element and trough - those forces which arise when pressing the plasticizing (or the injection nozzle) to a socket and retraction of the screw (in plasticizing). In other words, the collar is biased by the clamping elements against the support member.
    Thus, it is achieved in a simple manner that the system of the federal government on the support member is free of play - and preferably in all situations.
    In addition, the invention allows a quick change of the plasticizing, since the time required for the attachment of the clamping element is short and can be performed with commercially available tools. This has a positive effect on production because downtimes can be minimized.
    Another advantage of the construction according to the invention lies in the small axial space of the clamping means of the clamping element, whereby the entire injection unit can be made shorter.
    Protection is further desired for a molding machine having an injection unit according to the invention.
    Further advantageous embodiments of the invention are defined in the dependent claims.
    The fasteners may be formed in a particularly simple embodiment as fastening screws, which pass through holes in the clamping element and cooperate with fastening threads in the carrier part. Such mounting screws are simple and inexpensive to manufacture and allow the assembly of the plasticizing with standard tools. There are no special tools needed.
    Of course, the fasteners can also be performed hydraulically or electrically. In this case, the bracing can be done automatically.
    Due to the expansion of the plasticizing cylinder occurring during injection, the clamping element shifts toward the nozzle (ie towards the front end of the plasticizing cylinder) from the perspective of the carrier part. This also creates a relative movement between the clamping element and the carrier part, whereby the fastening elements are subjected to a bending load.
    It can therefore be provided that a ratio of a first equivalent spring stiffness for tensile loads of the plasticizing cylinder and a second equivalent spring stiffness for bending loads of the fastening elements-in particular the fastening screws-is greater than 500, preferably greater than 1000, and particularly preferably greater than 1500.
    By such a vote of the stiffness of the construction - in particular the fasteners - to the geometric arrangement and occurring for example in the injection molding cyclic loads influences of wear and fatigue can be virtually eliminated and it can be achieved exceptionally long service life.
    The clamping elements can act on the clamping element, the collar and / or the plasticizing cylinder, preferably with support on the carrier part.
    The clamping elements can be particularly easily formed as pressure screws, whereby they are easy and inexpensive to manufacture. In addition, this allows mounting with standard tools. Alternatively, the tensioning elements can be designed hydraulically-for example as hydraulic cylinders-or electrically, which can permit automatic assembly.
    The pressure screws can be supported by clamping threads, which are arranged in bores of the carrier body, and contact the clamping element, the collar and / or the plasticizing cylinder.
    The clamping element can be designed as - preferably flat - plate. Of course, other forms are conceivable. For example, the clamping element may be curved (like a yoke), in particular in the form of an elliptical, in particular circular, curved plate. But also more general shapes can be advantageous, with a prismatic shaped clamping element can serve as an example.
    These measures also serve to simplify the construction and to keep the Fierstellungskosten of the individual parts and the entire construction low.
    The clamping member may be mounted prior to placing the plasticizing cylinder in the trough on the plasticizing cylinder. On the one hand, this has the advantage that a correct orientation of the plasticizing cylinder is established automatically (by gravity) during assembly. Second, production can continue while the clamp is preassembled. This also contributes to the shortening of the actual assembly time.
    The clamping element can be (pre) mounted in the manufacture of the plasticizing or - as mentioned - the operator of the injection unit.
    Further advantages and details of the invention will become apparent from the figures and the associated description of the figures. Showing:
    1 shows a representation of the plasticizing cylinder and the carrier part in the unassembled state,
    Fig. 2 is a perspective view of an inventive
    Injection unit,
    3a, 3b sectional views of the injection unit according to the invention,
    4a, 4b representations of a second embodiment,
    5a, 5b representations of a third embodiment and Fig. 6a, 6b representations of a fourth embodiment.
    In Fig. 1, first, the support member 11 and the plasticizing cylinder 21 is shown in the unmounted state. For assembly of the plasticizing cylinder 21 is lowered into the trough 13 of the support member 11. The clamping element 23 is preassembled on the plasticizing cylinder 21, but could also be molded. By attaching the clamping member 23 on the support member 11 of the plasticizing cylinder 21 between clamping element 23 and trough 13 is braced. In this state, the collar 22 abuts the carrier part 11. If a pressure is exerted on the melt by a plasticizing screw arranged in the plasticizing cylinder 21 in order to inject plasticized plastic material into a cavity, a form-locking interlock between the collar 22 and the carrier part 11 acts.
    The trough 13 has in the present embodiment, upwards, but could also point to the side.
    The support member 11 is also referred to as a support plate.
    Fig. 2 shows a perspective view of the injection unit in the assembled state. It can be seen that the clamping element 23 is attached via fastening screws 24 (only one is provided with a reference numeral) to the support member 11. Evident are also the clamping elements 12, which are better seen in Fig. 3a.
    The clamping element 23 is releasably secured in this case by means of four screws (without reference numeral) on the plasticizing cylinder 21. However, the clamping element 23 could also be formed on the plasticizing cylinder 21.
    In Fig. 3a is a sectional view through the injection unit of Fig. 2 is shown. The cut was made so that it contains a longitudinal axis of the plasticizing cylinder 21, two fastening elements 24 and a clamping element 12, whereby their arrangement becomes clearer.
    The fastening elements 24 are formed in this embodiment as fastening screws.
    The running as pressure screws clamping elements 12 pass through holes in the support member 11 and press on the clamping element 23. For this they rely on a clamping thread in the holes of the support member 11 from.
    According to the plasticizing cylinder 21 was mounted in this embodiment on the support member 11, in the plasticizing cylinder 21 (including attachments such as temperature and the like.) Was lifted by means of a crane and suitable lifting means in the trough 13 of the support member 11. Subsequently, by means of the clamping elements 12 of the collar 22 of the plasticizing cylinder 21 is pressed against the end face of the support member 11 and thus axially braced. Finally, the clamping element 23 was attracted to the carrier part 11 via the fastening elements 24 for radial or vertical clamping of the plasticizing cylinder 21 in the depression 13.
    It would also be possible to first assemble the fasteners 24 to tension the clamp member 23 onto the plasticizing cylinder 21 and subsequently tighten the clamp members 12.
    The pressure screws can remain during disassembly of the plasticizing in the support member and tightened again at the next assembly of the plasticizing.
    In Fig. 3b, Fig. 3a is reproduced without reference numerals, for which the Ersatzfedersteifigkeiten Ci and c2 have been clarified.
    The substitute spring stiffness Ci describes the behavior of the plasticizing cylinder 21 under tensile loads.
    The substitute spring stiffness c2 describes the behavior of the fastening elements 24 under bending loads.
    In the present embodiment, this ratio was positively influenced by first the clamping elements 12 were mounted to produce a defined bias in the plasticizing cylinder 21 and only then tighten the mounting screws.
    A second embodiment is shown in FIGS. 4 a (corresponding to the view from FIG. 2) and 4 b (corresponding to the illustration from FIG. 3 a), wherein the clamping elements 12 act on the collar 22. For this purpose, the support member 11 is modified so that the collar is almost completely integrated into the support member 11 (complete admission of the collar 22 in the support member 11 would of course also possible).
    As can be seen in particular in Fig. 4b, are in those parts (reference numeral 25) of the support member 11, which include the collar 22 Druchgangslöcher. These are provided with clamping threads, which are supported by clamping elements 12 and press by contacting the collar 22.
    The mentioned integration of the collar 22 in the support member 11 but also for an action of the clamping elements 12 on the collar 22 is not absolutely necessary. Figs. 5a and 5b show a third embodiment, which is similar to the second embodiment. In contrast to the integration from FIGS. 4 a and 4 b, however, the tensioning threads for the tensioning elements 12 are integrated into two rockers 26. Although these wings 26 include the collar 22, but are not flat and therefore do not create integration of the collar 22 in the support member eleventh
    In Figs. 6a and 6b, a fourth embodiment is shown, which is similar to the first embodiment (Figures 2 and 3a). In contrast to this, however, the clamping element 23 is designed in two parts and is located approximately on the fleas of a central axis of the plasticizing 21st
    In order to facilitate the insertion and tightening of the clamping elements 12 in this embodiment, these are not only passed through holes in the support member 11, but also through the collar 22. For this purpose, the collar 22 has additional through holes through which the insertion and tightening of the clamping elements 12 possible is.
    权利要求:
    Claims (11)
    [1]
    claims
    An injection unit for a molding machine comprising a plasticizing cylinder (21) having a collar (22) and a support member (11) having a trough (13), the plasticizing cylinder (21) being disposed in the trough (13) and wherein an axial movement of the plasticizing cylinder (21) relative to the carrier part (11) is positively restrained by abutment of the collar (22) on the carrier part (11), and a clamping element (23) fastened or molded on the plasticizing cylinder (21) by means of fastening elements (24 ) Is attached to the support part (11), that the plasticizing cylinder (21) between the trough (13) and the clamping element (23) is braced, characterized in that the plasticizing cylinder (21) by means of clamping elements (12) against lifting of the Federal (22) from the support part (11) in an axial direction of the plasticizing cylinder (21) is braced.
    [2]
    2. Injection unit according to claim 1, characterized in that the fastening elements (24) are designed as fastening screws, which pass through holes in the clamping element (23) and cooperate with fastening threads in the carrier part.
    [3]
    3. Injection unit according to claim 1 or 2, characterized in that a ratio of a first equivalent spring stiffness (ci) for tensile loads of the plasticizing (21) and a second equivalent spring stiffness (c2) for bending loads of the fastening elements (24) - in particular the fastening screws - greater than 500 , preferably greater than 1000, and more preferably greater than 1500, is.
    [4]
    4. Injection unit according to one of claims 1 to 3, characterized in that the clamping elements (12) - preferably under support on the support part (11) - act on the clamping element (23).
    [5]
    5. Injection unit according to one of claims 1 to 4, characterized in that the clamping elements (12) - preferably under support on the support part (11) - on the collar (22) and / or the plasticizing cylinder (21) act.
    [6]
    6. Injection unit according to one of claims 1 to 5, characterized in that the clamping elements (12) are designed as pressure screws.
    [7]
    7. Injection unit according to claim 6 and 4 or 5, characterized in that the pressure screws via clamping threads, which are arranged in bores of the carrier body (11) support, and the clamping element (23) and / or the collar (22) and / or the plasticizing ( 21) contact.
    [8]
    8. Injection unit according to one of claims 1 to 7, characterized in that the clamping element (23) is designed as - preferably flat - plate.
    [9]
    9. forming machine with an injection unit according to one of claims 1 to 8.
    [10]
    10. A method for mounting a plasticizing cylinder (21) on a support part (11) of an injection unit (1) for a molding machine, wherein the plasticizing cylinder (21) - in a trough (13) of the support part (11) is arranged - by means of clamping elements ( 12) against lifting of the collar (22) from the support member (11) in an axial direction of the plasticizing (21) is braced and - by means of fastening elements (24) between a clamping element (23) and the trough (13) is clamped.
    [11]
    11. The method according to 10, characterized in that the clamping element (23) prior to arranging the plasticizing cylinder (21) in the trough (13) on the plasticizing cylinder (21) is mounted.
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    引用文献:
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    CA2816170A1|2010-11-24|2012-05-31|Husky Injection Molding Systems Ltd.|Mold-tool system having melt mixer assembly including melt-driven rotor assembly|
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    US20160279854A1|2014-12-04|2016-09-29|Extrude To Fill, LLC|Molding system and method of heating a material inside a molding system|JP6636119B1|2018-11-21|2020-01-29|株式会社日本製鋼所|Injection equipment|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50854/2016A|AT518638B1|2016-09-23|2016-09-23|Injection unit for a molding machine|ATA50854/2016A| AT518638B1|2016-09-23|2016-09-23|Injection unit for a molding machine|
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