• 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 with - a mass cylinder (2) in which plastic is plasticized, - a first opening (3) in the mass cylinder (2) by means of which the plastic an interior (4) of the mass cylinder (2) can be fed, - heating bands (5), which are arranged around the mass cylinder (2) around, and - a tempering sleeve (6) for temperature control - in particular cooling - a portion of the mass cylinder (2), wherein the temperature control sleeve (6) has a filler neck (7) with a second Opening (8), which second opening (8) overlaps the first opening (3), wherein the temperature control sleeve (6) has a collar-shaped extension (9) extending from the filler neck (7) along the mass cylinder (2) in the direction of Heating bands (5) extends.
    公开号:AT519152A1
    申请号:T50913/2016
    申请日:2016-10-10
    公开日:2018-04-15
    发明作者:Ing Florian Porod 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.
    Generic injection units comprise a mass cylinder, in which plastic is plasticizable, a first opening in the mass cylinder, by means of which the plastic one
    Interior of the mass cylinder can be fed,
    Heating bands which are arranged around the mass cylinder around, as well as a tempering cuff for tempering - in particular cooling - a portion of the mass cylinder, the Temperiermanschette having a filler neck with a second opening, which second opening overlaps the first opening.
    Depending on the plastic, it may be necessary to temper the mass cylinder in the form of cooling or heating in the region of the temperature control sleeve. Due to the adjacent arrangement of the temperature-control sleeve and the heating bands, heat is transferred between the temperature-control sleeve and the adjacent heating bands.
    This can have the disadvantageous effect that the plastic to be plasticized partially melts and sticks in the region of the temperature-control sleeve and the feed zone (when using a plasticizing screw). In the frequently used case of a plastic granulate - thus a granular material - thereby changes the grain size, which affects the intake behavior in an unpredictable manner. It can even come to a laying of the filler neck through the molten plastic.
    In summary, the following problems can be identified with injection units according to the prior art:
    Low temperature flexibility in the area of the temperature-control sleeve and in particular of the filler neck.
    Unpredictable influence on the intake behavior and subsequently on the entire plasticizing process due to inadequate temperatures in the area of the temperature control sleeve (and the feed zone).
    The optimum temperature gradient from the tempering sleeve is not reached.
    The object of the invention is therefore to at least partially improve the described disadvantages of the prior art.
    This object is achieved by an injection unit for a shaping machine having the features of claim 1. This is done by a cuff-shaped extension of the tempering, which extends from the filler neck along the mass cylinder in the direction of the Fleizbänder.
    The invention can preferably be used in shaping machines in the form of injection molding machines. But also the use in transfer molding, pressing and the like is conceivable.
    An advantage of the invention is the possibility of varying the temperatures in the region of the temperature-control sleeve and in particular of the filler neck in a larger range. In other words, it can be achieved by the invention to adjust the temperature gradient from the first or the second opening to the Fleizbändern in a wider range and thus can be ideally adapted to virtually any plastic to be processed.
    This increased temperature flexibility at the filler neck or in the intake zone of course, the intake behavior is positively influenced and ultimately the plasticizing can be increased.
    The invention can be used for dosing applications and in arrangements with shooting pot and the like.
    Further advantageous aspects are defined in the dependent claims.
    The tempering sleeve and / or the extension can substantially completely surround the mass cylinder, whereby under certain circumstances small clamping gaps and the like may exist. As a result, a uniform temperature of the corresponding region of the mass cylinder is achieved.
    The heating bands can be wound spirally and / or cuff-shaped around the mass cylinder. This too is conducive to a uniform temperature control of the mass cylinder. However, it is also conceivable, for example, to arrange a plurality of heating strips, which are aligned parallel to the mass cylinder, around the same.
    A first temperature sensor in the region of the temperature-control sleeve can be provided, which first temperature sensor is preferably arranged essentially at an axial position along the mass cylinder, which corresponds to an inner edge of the first opening closest to the heating strips. A second temperature sensor may be provided in the region of the heating bands. The presence of the temperature sensors makes it possible to control the temperature of the mass cylinder or the plastic in the interior of the mass cylinder. For this purpose, a control device may be provided, which is designed to control a heating power of the heating bands, wherein measured values of the second temperature sensor serve as a feedback variable for the control.
    Investigations by the Applicant have shown that the temperature flexibility at the tempering cuff and the gradient in the heating zone are particularly advantageous when a ratio of a distance between the first temperature sensor and the second temperature sensor and an inner diameter of the mass cylinder between 2 and 7, preferably between 2.5 and 6, and more preferably between 3 and 5.
    It may also be particularly advantageous for the measured values of the second temperature sensor to be used exclusively as a recirculated variable for the regulation of heating strips, which are arranged between the temperature control sleeve and the second temperature sensor. This prevents overheating of plastic in the first tempering zone, which would lead to degradation. Because at elevated temperature after the temperature sensors in the mass cylinder, the scheme could not respond, of course, because the second temperature sensor can not detect the elevated temperature due to its arrangement.
    The basic requirement for optimum temperature flexibility is, of course, sufficient cooling or heating capacity of the cooling sleeve. However, this alone may not always be enough.
    The heat conduction between the temperature-control sleeve and the mass cylinder in the region of the heating bands must also be sufficient. To optimize it, it may be advantageous if a ratio between a length of the extension - measured from a heating tape nearest the leading edge of the extension up to a heater bands closest inner edge of the first opening - and an outer diameter of the mass cylinder between 0, 2 and 0.6, preferably between 0.3 and 0.5, and more preferably between 0.39 and 0.45.
    The tempering cuff may have at least one tempering channel, which is suitable for conducting tempering medium through the tempering cuff. Of course, other possibilities of temperature control in connection with the invention can be used.
    In order to be able to adapt the cooling capacity of the cooling cuff to the required temperature gradient between the first temperature sensor and the second temperature sensor, a regulation of the cooling capacity can be provided.
    The control of the cooling capacity can be achieved by changing the flow rate or the temperature of the tempering medium (preferably water, oil) through the tempering cuff.
    The change in the flow rate can be made with a switching valve (on / off) or with a continuously variable valve. The control of these valves can be done with a control device. The controller may be implemented directly by a central machine controller or via an external controller coupled to the machine.
    Sensors (for example flow, temperature and / or pressure) can also be arranged in the supply line and / or return line of the temperature control line. These sensors can be used for optimized control of the cooling capacity.
    As conveying device for the required pressure of the tempering medium, e.g. a separate pump, a temperature control unit, a service network or a public network
    The cooling capacity can be adjusted by different populations in the flow and return. For a particularly smooth filling of the mass cylinder with plastic, it may be provided that the first opening and the second opening - preferably substantially exactly - aligned. As a result, steps and the like are avoided, which can hinder filling of the mass cylinder.
    Protection is also desired for a molding machine having an injection unit according to the invention.
    Further details and advantages of the invention will become apparent from the figures and the associated description of the figures. Showing:
    1 is a sectional view of an embodiment of the invention,
    2a is an analogous figure to Figure 1, wherein dimensions are illustrated,
    Fig. 2b is a diagram illustrating the increased flexibility in
    Temperatures and temperature gradients, as can be achieved according to the invention and
    Fig. 3 shows a shaping machine according to the invention in the field of
    Injection unit.
    FIG. 1 shows a sectional view of an injection unit 1 according to the invention.
    It comprises first the mass cylinder 2, in the interior 4, for example, a plasticizing screw (oblique gears of the plasticizing screw recognizable) can be used to-plastic preferably in the form of granules-aufzuschmelzen or plasticize (alternatively, instead of the plasticizing screw, for example, a piston for Plasticizing the plastic used).
    The mass cylinder 2 has a first opening 3, through which the interior 4 plastic can be supplied. In the region of the first opening 3, a temperature control sleeve 6 with a filler neck 7 is arranged. In the filler neck 7 is a second opening 8. In the present embodiment, the first opening 3 and the second opening 8 are aligned, whereby the filling of plastic in the mass cylinder 2 vonstattenatten without obstruction.
    Along the ground cylinder 2 then heating bands 5 are arranged. These are wound in a cuff shape around the mass cylinder 2. The heating bands 5 surround the mass cylinder 2 almost completely, with only one opening occurring through one (or more) nip.
    The heating power of the heating bands 5 is regulated by means of a control device 14. In this case, the two heating strips 5, which are the Temperiermanschette 6 closest to a first tempering zone summarized. Measured values of the second temperature sensor 12 are used as the returned variable for the first tempering zone. Subsequent tempering zones are regulated by means of further temperature sensors (not shown).
    The first temperature sensor 11 is arranged in the region of the temperature control sleeve. More specifically, the position of the first temperature sensor 11 corresponds to an axial position (along the mass cylinder 2) occupying the inner edge 13 of the first opening 3 closest to the heating bands 5.
    By the first temperature sensor 11 so the temperature of the mass cylinder 2 and the plastic in this area can be detected. As a result, the gradient in the region of the first tempering zone, that is to say between the first temperature sensor 11 and the second temperature sensor 12, can be monitored.
    The tempering sleeve 6 has a collar-shaped extension 9. This makes it possible to adjust the geometrical conditions so that the temperatures in the region of the first temperature sensor 11 are adjustable in a much wider range compared to the prior art (see also FIGS. 2a and 2b and the description thereof).
    FIG. 2 a substantially corresponds to FIG. 1, wherein different dimensions have been clarified and, for the sake of clarity, the reference symbols and the regulation have been omitted.
    The distance between the first temperature sensor 11 and the second temperature sensor 12 is denoted by Si. The inner diameter of the mass cylinder 2 is denoted by Ds. The extension 9 according to the invention makes it possible to optimally adapt the ratio of these two variables in order to be able to vary the temperature gradient in the first tempering zone as far as possible.
    The outer diameter of the mass cylinder 2 is designated as Dz. The length of the extension 9 is referred to as Y, wherein the length of the extension of the inner edge 13, which is closest to the heating bands 5, to the front end of the extension 9 is measured.
    By an appropriate choice of the ratio of Y and Dz, the heat transfer between the cooling sleeve 6 and that region of the mass cylinder 2, in which the heating strips 5 are arranged, can be optimized.
    Finally, the temperature control channels 15 are shown in FIG. 2a. Although these are not shown in the embodiment of FIG. 1, but present.
    FIG. 2b is an illustration of possible temperature profiles in the corresponding region of the mass cylinder 2. That is to say, the origin of the coordinate system represents the temperature at the second temperature sensor 12. The vertical dashed line further to the right corresponds to the temperature in the first temperature sensor 11. Ti denotes the temperature at the second temperature sensor Temperature sensor 12 and Tj denotes the temperature at the first temperature sensor 11. The invention makes it possible to vary this temperature Tj further than in the prior art, which is illustrated by the interval ΔΤτ.
    The present invention is not limited to the embodiment shown here. For example, a cylinder with circular inner and outer cross sections does not have to be used as the mass cylinder 2. In particular, when using a piston for plasticizing can in principle any base, which can accommodate a cylindrical plastic column can be used.
    FIG. 3 shows a shaping machine according to the invention in the region of the injection unit 1.
    权利要求:
    Claims (12)
    [1]
    claims:
    1. injection unit for a molding machine with - a mass cylinder (2) in which plastic is plasticized, - a first opening (3) in the mass cylinder (2), by means of which the plastic an interior space (4) of the mass cylinder (2) can be fed - Heating bands (5) which are arranged around the mass cylinder (2) around, and - a Temperiermanschette (6) for temperature control - in particular cooling -eines section of the mass cylinder (2), wherein the Temperiermanschette (6) has a filler neck (7) a second opening (8), which second opening (8) overlaps the first opening (3), characterized in that the tempering sleeve (6) has a sleeve-shaped extension (9) extending from the filler neck (7) along the mass cylinder ( 2) in the direction of the heating strips (5).
    [2]
    2. Injection unit according to claim 1, characterized in that the Temperiermanschette (6) and / or the extension (9) the mass cylinder (2) substantially completely surrounds.
    [3]
    3. Injection unit according to one of the preceding claims, characterized in that the heating strips (5) spirally and / or cuff-shaped around the mass cylinder (2) are wound.
    [4]
    4. Injection unit according to one of the preceding claims, characterized in that a first temperature sensor (11) in the region of the temperature control sleeve (6) is provided, which first temperature sensor (11) is preferably arranged substantially at an axial position along the mass cylinder (2) which corresponds to an inner edge (13) of the first opening (3) closest to the heating strips.
    [5]
    5. Injection unit according to one of the preceding claims, characterized in that a second temperature sensor (12) in the region of the heating bands (5) is provided.
    [6]
    6. Injection unit according to claim 4 and 5, characterized in that a ratio of a distance (Si) between the first temperature sensor (11) and the second temperature sensor (12) and an inner diameter (Ds) of the mass cylinder (2) between 2 and 7, preferably between 2.5 and 6, and more preferably between 3 and 5.
    [7]
    7. Injection unit according to claim 5 or 6, characterized in that a control device (14) is provided, which is designed to control a heating power of such heating bands (5) in one of the temperature control sleeve (6) to the second temperature sensor (12) reaching Range of the mass cylinder (2) are arranged, wherein measured values of the second temperature sensor (12) serve as a feedback variable for the control.
    [8]
    8. Injection unit according to claim 7, characterized in that the measured values of the second temperature sensor (12) is used exclusively as a recirculated variable for the control of heating bands (5) which are arranged between the temperature control sleeve (6) and the second temperature sensor (12) ,
    [9]
    9. Injection unit according to one of the preceding claims, characterized in that a ratio between a length (Y) of the extension (9) - measured from one of the heating bands (5) closest to the front edge of the extension (9) to one the heating bands ( 5) closest inner edge (13) of the first opening (3) - and an outer diameter (Dz) of the mass cylinder (2) between 0.2 and 0.6, preferably between 0.3 and 0.5 and more preferably between 0 , 39 and 0.45.
    [10]
    10. Injection unit according to one of the preceding claims, characterized in that the Temperiermanschette (6) has at least one temperature control channel (15) which is suitable for the passage of tempering through the Temperiermanschette (6).
    [11]
    11. Injection unit according to one of the preceding claims, characterized in that the first opening (3) and the second opening (8) are aligned.
    [12]
    12. Forming machine with an injection unit (1) according to one of the preceding claims.
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    同族专利:
    公开号 | 公开日
    AT519152B1|2018-09-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JPS61235120A|1985-04-12|1986-10-20|Mitsubishi Heavy Ind Ltd|Temperature regulating device|
    JPH0788911A|1993-09-28|1995-04-04|Fanuc Ltd|Screw cooling device for injection molding machine|DE102021111623A1|2020-05-08|2021-11-11|Engel Austria Gmbh|Plasticizing unit for a molding machine|DE112005003359T5|2005-01-06|2008-04-17|Sumitomo Heavy Industries, Ltd.|Molding machine, injection device and temperature control method for the device|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50913/2016A|AT519152B1|2016-10-10|2016-10-10|Injection unit|ATA50913/2016A| AT519152B1|2016-10-10|2016-10-10|Injection unit|
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