• 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:
    Method for monitoring a device for tempering medium supply (1) of a tool (2) of an injection molding machine, wherein the device for Temperiermedienversorgung (1) has a flow (3) and a return (6), between which at least one tempering (4, 5) in which at least one flow sensor (8) is arranged in each of the at least one tempering line (4, 5), wherein - at least one pressure drop in the at least one tempering line (4,5) is measured, - due to one with the at least one flow sensor ( 8) measured at least one volume flow and due to the at least one measured pressure drop at least one hydraulic resistance (R) and / or at least one change in resistance of the at least one tempering (4.5) is calculated and the at least one hydraulic resistance (R) and / or the at least one resistance change is visually displayed.
    公开号:AT513042A4
    申请号:T1338/2012
    申请日:2012-12-21
    公开日:2014-01-15
    发明作者:Florian Raschke；Klaus Taenzler
    申请人:Engel Austria Gmbh；
    IPC主号:
    专利说明:

    1 72742 32 / gb
    The present invention relates to a method for monitoring a device for Temperiermedienversorgung a tool of an injection molding machine having the features of the preamble of claim 1 and such a device having the features of the preamble of claim 13.
    In plastics processing, and in particular in plastic injection molding, it is important that the mold - called the tool for short - is appropriately tempered, ie that specific temperatures are kept constant over the production period in the mold by deliberately supplying and removing heat. To achieve this, channels are created in the tool, which are traversed by a fluid - in most cases water. These channels are also referred to as tempering lines. Frequently, several channels are supplied with a fluid of the same temperature, so that these channels are fed from a flow and summarized after passing through the tool to a return. This splitting and merging of the fluid is usually done in manifolds, in which, for example, a pressure sensor or flow sensors are arranged. An example would be the applicant's AT 12213 U1.
    However, it is also quite common for the temperature control lines to be supplied individually with temperature control medium. Even with this type of supply, a pressure or flow sensor is often integrated in the temperature control system.
    Undetected deposits or blockages carry the risk of changing the thermal budget in the tool up to the damage of the tool in case of excessive deviation from specified temperatures. This is the case both in the Temperiermedienversorgung with individual Temperierleitungen as well as with several Temperierleitungen, with the problem aggravated in the latter case, since deposits and clogging are harder to detect.
    The following method for the identification of deposits or blockages in temperature control systems is known: In each temperature control line, the flow is recorded as a reference at a certain time. In order to prove changes in the hydraulic system, the
    Flow rate recorded in each temperature control line / If changes from the reference can be detected, it is assumed that there are changes or blockages.
    This method has the disadvantage that the pressure in the luff and in the return must be constant. Pressure fluctuations, which often occur in practice, can not be taken into account. In practice, therefore, to measure the flow rates, the operation must be interrupted and the tool connected to suitable measuring instruments in order to achieve the required accuracy.
    The object of the invention is to provide a method which allows the reliable detection of blockages and deposits in the temperature control during operation. Furthermore, an apparatus for carrying out such a method is to be provided.
    This object is achieved by a method having the features of claim 1 and with a device having the features of claim 13.
    By the simultaneous measurement of the pressure drop and the volume flow, the hydraulic resistance in the at least one tempering line can be calculated. Due to this size can be reliably assessed whether deposits or leaks exist. In particular, the hydraulic resistance is independent of the prevailing in the temperature control lines pressure ratios and flow rates. Therefore, the hydraulic resistance is also suitable during operation as a characteristic. In addition, the hydraulic resistance represents a value that is easy for the operator to interpret and compare, which reduces the effort required to train the operating personnel.
    The change in the hydraulic resistance, ie the change in resistance, is in many cases a well-suited parameter. This is especially true when a rapid clogging of one or more tempering a danger.
    Further advantageous embodiments of the invention are defined in the dependent claims.
    To keep manufacturing costs low, the pressure drops in the temperature control with only one pressure sensor in the flow and a pressure sensor in the return can be measured. This embodiment is also possible in the presence of several parallel tempering, since the pressure drop across parallel circles is the same size. For a particularly accurate determination of the pressure drops, the pressure drops can be measured by two each in the temperature control lines fluidly arranged in series pressure sensors.
    Particularly preferred is an embodiment in which the at least one hydraulic resistance and / or the at least one resistance change is displayed on a screen.
    In order to automate the detection of blockages or deposits, it may be provided that at least one permitted range for the at least one hydraulic resistance of the at least one tempering line is determined and / or at least one allowed range of change for the at least one change in resistance of the at least one tempering line is established , upon leaving the at least one deafened area by the at least one hydraulic resistance and / or leaving the at least one allowed change range by the at least one resistance change, a warning signal is output. For a particularly simple determination of the permitted ranges or the permitted change ranges, a measurement or a simulation of the hydraulic resistances can be carried out before the start of operation. For a reliable transmission of the warning signal to the operating personnel, this can be displayed optically, in particular by being displayed on a screen, or output audibly as a warning tone.
    In order to prevent production of defective parts or damage to the tool due to insufficient temperature control, it may be provided that the injection molding machine is switched off when the warning signal is output.
    A general formula for calculating the hydraulic resistance is given by Φ2, where R denotes the hydraulic resistance, Δρ denotes the pressure drop as the difference of the measured pressures and Φ denotes the measured volume flow. Other formulas for determining the hydraulic resistance are also known per se to the person skilled in the art. For example, the exponent of the volumetric flow can be changed to account for various geometrical conditions that may be present in the conduits.
    In some cases, an increase in the accuracy of determining the hydraulic resistance can be achieved by measuring a temperature of the tempering medium and using it to calculate the hydraulic resistance. It is also conceivable to include other variables, such as the Reynolds number, the viscosity or the compressibility of the temperature control medium, in the calculation.
    Due to its high heat capacity, water is in many cases well suited as a tempering medium and can therefore be used as a tempering medium. Of course, other media or additives can be used.
    Usually, a control or control unit is provided for a device for Temperiermedienversorgung, being controlled or controlled, for example, according to the pressure and / or the volume flow. In order to comply with predetermined temperatures particularly accurately, it may be provided in this case that the setpoint values for the pressure or the volume flow of the temperature control medium are set as a function of the at least one hydraulic resistance and / or the at least one resistance change.
    Of course, the control or control unit and the evaluation unit are only logically separate units and can easily be present in a single physical device. In modern injection molding machines, it is the rule that both are integrated into a common machine control.
    In order to determine the optimum state of a temperature control system, the at least one hydraulic resistance can be measured as a reference before the start of operation. If there are geometric changes in a circle, for example due to deposits or blockages, a change in the hydraulic resistance can be detected.
    Both current and historical hydraulic resistances or resistance changes can be displayed, making this data accessible to operating personnel.
    Further advantages and details of the invention will become apparent from the figures and the associated description of the figures. Showing:
    1 is a schematic representation of a device according to the invention for Temperiermedienversorgung with two temperature control,
    2 shows an altemative arrangement for the arrangement of the pressure sensors of the embodiment shown in FIG. 1 and ·· ** · t »· ···· · **
    Fig. 3 is a schematic representation of a device according to the invention for Temperiermedienversorgung with a tempering.
    In FIG. 1, first of all the tambour 3, the temperature control lines 4 and 5 as well as the return 6 of the device for tempering medium supply 1 can be seen. The tempering lines 4 and 5 pass through the tool 2, which are hereby tempered. Furthermore, two pressure sensors 9 and in each case one flow sensor 8 are arranged in the temperature control lines 4 and 5, which are each connected to the evaluation device 10. The evaluation device 10 has a screen 13 on which the warning signals or using the
    Formula ä = ^ calculated hydraulic resistances can be displayed. Of
    Furthermore, a warning signal can be displayed on the screen 13 when one of the hydraulic resistors R leaves a permitted range.
    In this embodiment, the flow rate through the Temperierleitungen 4, 5 is controlled by means of a flow control valve 7. For this purpose, the control device 12 is connected both to the flow control valve 7 and to two pressure sensors 9.
    Figure 2 shows an alternative arrangement of the pressure sensors 9, of which one is arranged in the flow and one in the return, which represents a somewhat cheaper construction. The evaluation device and the control or regulating device are not shown, since they are to be provided analogously to FIG.
    FIG. 3 shows an embodiment with a single temperature control line 4 between the supply line 3 and the return line 6, wherein the temperature control line 4 passes through the tool 2. Here, too, two series-connected pressure sensors 9 and a Durchfiusssensor 8 are provided, which is connected to the evaluation device 10. Again, the output of the hydraulic resistance R and the resistance change takes place on a screen 13
    Furthermore, in this embodiment, a control device 12 is present, which is connected to an actuator 7. To determine the desired value for the control with the inclusion of the hydraulic resistance R, the control device 12 is connected to the evaluation device 10.
    The present invention is not limited to the disclosed embodiments. In an embodiment with two or more temperature control lines, for example, any hybrid forms of the arrangements of the pressure sensors shown here can be realized, e.g. two pressure sensors in the temperature control lines and a pressure sensor in the return line. That too
    Flow control valve can be arranged in the flow or in the return. In one embodiment with a tempering, the tool can also be repeated several times.
    Innsbruck, December 20, 2012
    权利要求:
    Claims (23)
    [1]
    1. A method for monitoring a device for Temperiermedienversorgung (1) of a tool (2) of an injection molding machine, wherein the device for Temperiermedienversorgung (1) has a flow (3) and a return (6), between which at least one Temperature control line (4, 5) is arranged, wherein in each of the at least one tempering (4.5) at least one Durchfiusssensor (8) is arranged, characterized in that - at least one pressure drop in the at least one tempering (4.5) is measured , - at least one hydraulic resistance (R) and / or at least one resistance change of the at least one temperature control line (4,5) is calculated on the basis of a at least one flow sensor (8) and at least one measured pressure drop; -wapigstensyojydrauliscb & resistance ^ Etjund / Qderdi & at least one resistance change visually is pictured.
    [2]
    2. The method according to claim 1, characterized in that the at least one pressure drop by a respective pressure sensor (9) in the flow (3) and a pressure sensor (9) in the return line (6) is measured.
    [3]
    3. The method according to claim 1 or 2, characterized in that the at least one pressure drop by two each in the at least one tempering (4.5) fluidically arranged in series pressure sensors (9) is measured.
    [4]
    4. The method according to at least one of claims 1 to 3, characterized in that the at least one hydraulic resistance and / or the at least one change in resistance on a screen (13) is shown. ·· ## ··

    72742 32/32
    [5]
    5. The method according to claim 1 to 4, characterized in that at least one permitted range for the at least one hydraulic resistance (R) of the at least one tempering (4.5) is determined and / or at least one allowed range of change for at least one change in resistance at least one tempering line (4, 5) is set, upon leaving the at least one permitted range by the at least one hydraulic resistance (R) and / or upon leaving the at least one allowed change range by the at least one resistance change a warning signal is output.
    [6]
    6. The method according to claim 5, characterized in that the warning signal optically - in particular by presentation on a screen (13) -Emitted and / or that the warning signal is output acoustically.
    [7]
    7. The method according to claim 5 or 6, characterized in that upon issuance of the warning signal, the injection molding machine is switched off.
    [8]
    8. The method according to at least one of claims 5 to 7, characterized in that for determining the at least one permitted range and / or the at least one allowed range of change before starting operation, a measurement of the at least one hydraulic resistance (R) or a simulation is performed.
    [9]
    9. The method according to at least one of claims t to 8, characterized in that the at least one hydraulic resistance (R) according to the equation

    where R denotes the at least one hydraulic resistance, Ap denotes the at least one pressure drop, and Φ denotes the at least one volume flow.
    [10]
    10. The method according to at least one of claims 1 to 9, characterized in that a temperature of the Temperiermediums is measured and in the calculation of the at least one hydraulic resistance (R), the temperature of the Temperiermediums is included.
    [11]
    11 .Method according to at least one of claims 1 to 10, characterized in that water is used as tempering.
    [12]
    12. A method for Temperiermedienversorgung a tool (2) of an injection molding machine according to at least one of claims 1 to 11, wherein at least one actuator (7) - in particular a flow control valve - regulated according to a target value for a pressure of the temperature control medium and / or for a volume flow of Temperiermediums or controlled, characterized in that the desired value is determined as a function of the at least one hydraulic resistance {R) and / or the at least one change in resistance of the at least one tempering line (4, 5).
    [13]
    13. A device for Temperiermedienversorgung a tool of an injection molding machine with - a flow (3) for the central supply of a tempering, - a return (6) for the central removal of the tempering, - at least one tempering (4.5), which with the flow (3 ) and the return line (6), for controlling the temperature of the tool (2), - at least one flow sensor (8) in each of the temperature control lines (4,5) for measuring at least one volume flow and • an evaluation device (10), which with the at least one flow sensor (8) is connected, characterized in that at least two pressure sensors (9) are provided, which are connected to the evaluation device (10) for measuring at least one pressure drop that due to the at least one measured volume flow and due to the at least one measured pressure drop from the evaluation device (10) at least one hydraulic resistance (R) and / or at least one opponent Changes in the at least one tempering line (4, 5) is calculable and that the at least one hydraulic resistance (R) 72742 32/32 ♦ * · ♦ ···· I • · · · Μ * »· * * * • · · · And / or the at least one change in resistance can be represented by a visualization device. *** "
    [14]
    14. The apparatus according to claim 13, characterized in that of the at least two pressure sensors (9) each have a pressure sensor (9) in the flow (3) and a pressure sensor (9) in the return (6) is arranged.
    [15]
    15. The apparatus of claim 13 or 14, characterized in that the at least two pressure sensors (9) in the at least one tempering (4.5) are arranged.
    [16]
    16. The device according to at least one of the Ansprehe 13 to 15, characterized in that the visualization device is designed as a screen (13).
    [17]
    17. The device according to at least one of claims 13 to 16, characterized in that in the evaluation device (10) at least one permitted range for the at least one hydraulic resistance (R) and / or at least one allowed change range for the at least one change in resistance of the at least one Temperierleitung (4,5) can be stored / is and that upon leaving the at least one permitted range by the at least one hydraulic resistance (R) and / or leaving the at least one change range by the at least one resistance change a warning signal can be output.
    [18]
    18. The device according to claim 17, characterized in that the warning signal is optically - in particular by presentation on a screen (13) -ausgebbar and / or that the warning signal is acoustically outputable.
    [19]
    19. The apparatus of claim 17 or 18, characterized in that upon issuance of the warning signal, the injection molding machine of the evaluation device (10) can be switched off. ·· ♦ ♦ ··

    72742 32/32
    [20]
    20. The device according to at least one of claims 13 to 19, characterized in that the at least one hydraulic resistance (R) according to the equation

    is determinable, wherein R denotes the at least one hydraulic resistance, Ap denotes the at least one pressure drop and Φ denotes the at least one volume flow.
    [21]
    21 .Vorrichtung according to at least one of claims 13 to 20, characterized in that with the evaluation device (10) connected to the temperature sensor for measuring a temperature of the temperature control medium is provided and that the at least one hydraulic resistance (R) can be calculated based on the temperature.
    [22]
    22. The device according to at least one of claims 13 to 21, characterized in that the & tempering medium is water.
    [23]
    23. The device according to at least one of claims 13 to 22 with at least one actuator (7), in particular a flow control valve, which with a control or regulating device (12) for controlling or controlling the actuator (7) according to a desired value for a pressure of the temperature and / or for a volume flow of the tempering medium, characterized in that the desired value in dependence on the at least one hydraulic resistance (R) and / or the at least one resistance change can be determined. Innsbruck, December 20, 2012
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA1338/2012A|AT513042B1|2012-12-21|2012-12-21|Device for tempering medium supply and method for monitoring the same|ATA1338/2012A| AT513042B1|2012-12-21|2012-12-21|Device for tempering medium supply and method for monitoring the same|
    DE102013016773.6A| DE102013016773B4|2012-12-21|2013-10-09|Device for tempering medium supply and method for monitoring the same|
    CN201310585926.7A| CN103878964B|2012-12-21|2013-11-20|Method For Monitoring A Temperature Control Media Supply|
    US14/096,521| US9457505B2|2012-12-21|2013-12-04|Method for monitoring a temperature control media supply|
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