• 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 two branch lines (4, 5) fluidically are arranged in parallel, wherein in each of the at least two branch lines (4, 5) a flow sensor (8, 8 ') is arranged, wherein by a comparison of the flow rate from the sensors (8, 8') supplied measurement data between pressure fluctuations in the flow (3) or in the return (6) and the presence of a leak is distinguished.
    公开号:AT511110A4
    申请号:T4/2012
    申请日:2012-01-02
    公开日:2012-09-15
    发明作者:Florian Raschke
    申请人:Engel Austria Gmbh；
    IPC主号:
    专利说明:

    The present invention relates to a method for monitoring a device for Temperiermedienversorgung a tool of an injection molding machine, wherein the device for Temperiermedienversorgung has a flow and a return, between which at least two branch lines are arranged fluidically parallel, wherein in each of the at least two branch lines, a flow sensor is arranged ,
    Tools for plastics processing are usually connected to a device for Temperiermedienversorgung having at least a flow, a return and interposed branch lines {channel circles). These tools are usually designed with a channel system.
    This channel system allows fluids to enter areas within a tool where energy is to be supplied or removed. In many plastic processing methods - including in injection molding - it is important to be able to influence the temperature in specific areas of a tool in a targeted manner, which is why the entire channel system in the tool often consists of several channel circuits.
    The supply of fluids to tools takes place in the processing of plastics usually centrally, which is why in tools with multiple channel circuits a distribution of the volume flows before entering the tool is required. The distribution of a central fluid flow to individual channel circuits is done by distributor units.
    Depending on the fluid used, number of branches, flow rate and other requirements, different distributor units are available on the market. For some time, a trend towards high-quality distribution units, which are equipped with sensors, is increasingly being observed. With these sensors, flows, temperatures and, in rare cases, pressures are usually measured to monitor processes and conditions surrounding the temperature control of tools.
    More and more frequently, the integration of additional sensors for the detection of fluid losses from the circulation system takes place. 69995 36 / fr * · ** " 2 ......
    Fluid losses from the circulatory system - also known as leaks or leaks - are generally recurring problems for production companies and can result in considerable economic damage, especially if unnoticed - for example, out of service - large quantities of fluid through hose breaks , Tearing out of terminals, etc. flow out.
    Systems for detecting fluid losses are therefore suitable for integration into
    Distributor units on.
    There are a number of methods for detecting fluid losses from temperature control circuits known: - In the flow and in the return, the measurement of the flow rate. For this purpose, additional sensors for measuring are integrated at the corresponding positions. Fluid losses that occur between the sensors result from the calculation of the flow difference.
    This method has the disadvantage that additional sensors for measuring the flow rates are required. In addition to the additional costs for the sensors, an increased space requirement is recorded. In the event of a sensor failure or signal fluctuations, reliable detection of fluid losses is no longer guaranteed. - In the parallel branches at least two sensors for
    Flow Measurement Integrated The calculation of the flow difference represents the monitoring basis of fluid losses for those branch lines located between the sensors.
    This method has the disadvantage that each parallel branch line at least two sensors for measuring the flow rates are used, resulting in clear 69995 36 / fr * · · I ** ** ι * * ..... S ·· ** **
    Additional costs result. In addition to the additional costs, each additional sensor in the system means an increased risk of sensor failure. - At least one pressure value is recorded throughout the system. Its rapid drop may indicate a sudden loss of fluid from the system.
    This method has the disadvantage that only very large fluid losses are detected. Conscious pressure changes in the circulatory system can not be distinguished from fluid losses. Furthermore, the detection of fluid losses is highly dependent on the position of the pressure measurement to the location of fluid loss.
    The object of the invention is to provide a comparison with the prior art simplified method for monitoring a device for Temperiermedienversorgung a tool of an injection molding machine.
    This object is achieved by a method according to claim 1. Advantageous embodiments are defined in the dependent claims.
    The fluids used are preferably liquids, in particular water.
    Each state and each event in the circulatory system of the device for Temperiermedienversorgung can be described by evaluating the measurement signals from pressure and flow sensors. The detection of states and events takes place from the interaction of measured data from the introduced into the temperature control circuits pressure and / or flow sensors, preferably at least one pressure or flow sensor is in the flow and in each case at least one flow sensor in each branch line.
    The steady-state condition and the events "fluid loss from the circulatory system (leak)", "pressure and flow fluctuation in the flow and return" become "stationary". and "Change of resistance after partitioning of the fluid on the parallel branches by an actuator (control) " distinguished. Due to the interplay of measured data from at least three sensors, the 69995 36 / fr ..... * 4 ......
    Characterization of a state or an event achievable. In the case of measurement data, a distinction is made between increasing progressions, falling gradients and gradients that do not change substantially. The characteristics of the measured data depend not only on the sensors used, but also on the position of a fluid loss in the circuit to the sensor and on the position of possible actuators present to the sensor.
    With the method according to the invention, leaks between the sensor in the flow and the sensors in the parallel circles can be detected. Leakage after a flow sensor in one of the parallel branch lines can not initially be distinguished from a change in the actuator. In a fluid distributor with automatic flow control, however, the controller is aware of when a control process takes place. So here is a delimitation of the leakage after the sensor given and this can be detected (see table "leak in branch line 4 after flow sensor 8 in this line").
    In the case of fluid distributors with automatic volume control or distributors without the possibility of setting the quantity, it is possible to go one step further and save the sensor in the central flow by knowing the control process or by the fact that no control process can take place. In this case, leakages only have to be differentiated from pressure fluctuations. In the case of pressure fluctuations, the flow rates in the individual branch lines change proportionally; in the case of leaks, the affected branch line reacts more and more strongly than the others. If there is the possibility that it may be due to a mechanical action to a change in cross section of a (relevant) branch line - for example, by kinking a hose of the affected branch - this leads to the same sensor behavior as when carrying out a control operation by actuation of an actuator. In this case, a pressure or flow sensor is required.
    Advantages of the invention over the prior art: - Most distribution units offered on the market already incorporate sensors for measuring flows in the parallel branches. In order to integrate the fluid loss detection in the distribution unit only an additional pressure sensor is necessary. In rare cases, the pressure sensor is already installed in the distributor unit. This eliminates additional costs for additional sensors. - Integrating the sensors into the distribution unit eliminates the need for additional sensors, which reduces the space required by the distribution units. - By the addition of additional flow sensors to the distribution unit, although a detection of fluid losses is possible, however, the fluid loss can not be assigned to a circle. By evaluating the interaction of measurement signals from pressure and flow sensors, the fluid loss can be assigned to the respective parallel branch line. - By evaluating the interaction of measurement signals from multiple sensors states and events can be detected in the circulatory system. These include, for example, pressure and flow fluctuations in the central fluid supply or the change of flows in individual parallel branch lines, which are caused by setting operations.
    Details of the invention will be discussed with reference to the figures of various embodiments. By way of example, only two branch lines are shown. Of course, more branches could be provided.
    Figure 1: • pressure sensor 9 in the central flow 3 • flow sensor 8, 8 'in each parallel branch line 4, 5
    69995 36 / fr
    Event Signal flow Pressure sensor 9 Flow sensor 8 Flow sensor 8 'a Leak in branch line 4 between pressure sensor 9 and flow sensor 8 U t / Wi b Open actuator in branch line 4 u TT U c Close actuator in branch line 4 rt u TT d Pressure in central flow 3 increases n TT TT e Pressure in the central flow 3 drops on pressure in the central return 6 rises TT u H g pressure in the central return 6 drops u TT TT
    Discussions on the individual events a) A leak in the branch line 4 reduces the total flow resistance in the duct system and consequently also the measured pressure at the pressure sensor 9 drops. At the same time, the measured volume flow at the flow sensor 8 drops because a part of the actual volume flow drops through the leak the branch line is lost.
    The volume flow measured by the flow sensor 8 'behaves in the case of a leak in branch line 4 rising, falling or the same. The behavior of the volume flow in branch line 5 is dependent on the position of the leak in branch line 4. The signal change of the flow sensor 8 'in the event of a leak in branch line 4 is always significantly lower than that of the flow sensor 8.
    69995 36 / fr b) By opening an actuator (flow control valve 7), the flow in branch line 4 increases and the measured pressure at pressure sensor 9 drops. The fact that the pressure in the central flow 3 decreases, and the geometric conditions do not change in branch line 5, the pressure difference between the central flow 3 and return 6 drops. Consequently, the flow in branch line 5 drops. By opening an actuator, the total flow always increases. As a rule: signal increase flow sensor 8 Φ signal drop flow sensor 8 '. c) By closing an actuator (flow control valve 7), the flow decreases in branch line 4 and the measured pressure at the pressure sensor 9 increases. The fact that the pressure in the central flow 3 increases, and the geometric conditions do not change in branch line 5, increases the pressure difference between the central flow 3 and return 6. Consequently, the flow increases in branch line 5 at. By closing an actuator, the overall throughput always drops. As a rule: signal drop flow sensor 8 Φ signal rise flow sensor 8 '. d) An increase in pressure in the central flow 3 means an increase in the pressure difference between the central flow 3 and return 6. Consequently, the flow rates increase in all branch lines 4, 5. The increase of the flow in the branch lines 4, 5 behaves in percentage approximately equal. e) A pressure drop in the central flow 3 behaves in the opposite direction to point d). f) If the pressure in the central return 6 increases, the pressure in the central flow 3 also increases. The pressure difference between the central flow 3 and the return 6 is reduced overall and the flow rates in the branch lines 4, 5 fall. The drop in the flows in the parallel branch lines 4, 5 behaves approximately equal in percentage. g) A pressure drop in the central return 6 behaves in the opposite direction to point f). 69995 36 / fr ..... 8 ......
    Figure 2: • flow sensor 10 in the central flow 3 • flow sensors 8, 8 'in each parallel branch line 4, 5
    Event Signal flow Flow sensor 10 Flow sensor 8 Flow sensor 8 'a Leak in branch line 4 between flow sensor 10 and flow sensor 8 TT UT / WT b Open actuator in branch line 4 TT TT uc Close actuator in branch line 4 TT d Pressure in central flow 3 increases TT TT TT e pressure in the central flow 3 drops on pressure in the central return 6 rises uuug pressure in the central return 6 drops TT TT TT
    Discussions on the individual events: a) Due to a leak in the parallel branch line 4, the entire sinks
    Flow resistance in the duct system and the total flow in the flow 3 increases. At the same time, the measured volume flow at the flow sensor 8 drops, since part of the actual volume flow is lost via the leak from the branch line 4. The volume flow measured by the flow sensor 8 'behaves in the case of a leak in the branch line 4 rising, falling or the same. The behavior of the volume flow in branch line 5 depends on the position of the leak in branch line 4. 69995 36 / fr
    The signal change of the flow sensor 8 'at a leak in branch line 4 is always significantly lower than that of the flow sensor 8. b) By opening an actuator (flow control valve 7) increases the flow in branch line 4 and the total flow in the flow 3. Das Pressure in the central flow 3 drops, and the geometric conditions do not change in branch line 5, the pressure difference between the central flow 3 and return 6 drops. Consequently, the flow in branch line 5 drops. By opening an actuator, the total flow always increases. As a rule: signal increase flow sensor 8 Φ signal drop flow sensor 8 '. c) By closing an actuator (flow control valve 7) decreases the flow in branch line 4 and the total flow in the flow 3. The fact that the pressure in the central flow 3 increases, and the geometric conditions do not change in branch 5, the pressure difference increases between central flow 3 and return 6. As a result, the flow in branch 5 increases. By closing an actuator, the overall throughput always drops. As a rule applies: signal drop flow sensor 8 Φ signal rise flow sensor 8 ', d) A pressure increase in the central flow 3 means an increase in the pressure difference between the central flow 3 and return 6. Consequently, the flow rates increase in all branch lines 4, 5. The increase in Flow in the branch lines 4, 5 behaves in percentage approximately equal. e) A pressure drop in the central flow 3 behaves in the opposite direction to point d). f) If the pressure in the central return 6, it also leads to an increase in the pressure in the central flow 3. The pressure difference between the central flow 4 and return 6 is reduced overall and the
    Flows in the branch lines 4, 5 sink. The drop in the flows in the branch lines 4, 5 behaves approximately equal in percentage. g) A pressure drop in the central return is opposite to point f).
    Innsbruck, on December 30, 2011
    权利要求:
    Claims (5)
    [1]
    69995 36 / fr ...... 1 ...... Claims: 1. A method for monitoring a device for tempering medium supply (1) of a tool (2) of an injection molding machine, wherein the device for tempering medium supply (1) a flow ( 3) and a return (6), between which at least two branch lines (4, 5) are arranged fluidically parallel, wherein in each of the at least two branch lines (4, 5) a flow sensor (8,8 ') is arranged, characterized in that a distinction is made between the pressure fluctuations in the flow (3) or in the return (6) and the presence of a leak by comparing the measurement data supplied by the flow sensors (8, 8 ').
    [2]
    2. The method according to claim 1, characterized in that in the flow (3) a pressure or flow sensor (9, 10) is arranged, the measured data in comparison of the in the at least two branch lines (4, 5) arranged flow sensors (8 , 8 ') are taken into account.
    [3]
    3. The method according to claim 1 or 2, characterized in that in a proportional change of the flows in the at least two branch lines (4, 5) is inferred on a pressure fluctuation in the flow (3) or in the return (6) and at a non-proportional Change of one of the at least two branch lines (4, 5) on a leak in one of these branch lines (4, 5) is inferred.
    [4]
    4. The method according to claim 2 or 3, characterized in that in a change of the flow in an affected branch line (4, 5) of the at least two branch lines (4, 5) and a simultaneous opposite change of the flow in at least one other branch line ( 4, 5) and a simultaneous change of the pressure in the flow (3) analogous to the change of the flow in the at least one other branch line (4, 5) on a control process or the presence of a change in cross section of the affected branch line (4, 5) is inferred. 69995 36 / fr • I »« · »· · ι · t« «* *« * * · · • ψ * ·· I · «4 * · ...... 2 ......
    [5]
    5. The method according to claim 2 or 3, characterized in that in a change of the flow in an affected branch line (4, 5) of the at least two branch lines (4, 5) and a simultaneous opposite change of the flow in the at least one other branch line ( 4, 5) and a simultaneous change of the flow in the flow (3) analogous to the change of the flow in the affected branch line (4, 5) to a control process or the presence of a change in cross section of the affected branch line (4, 5) is inferred. Innsbruck, on December 30, 2011
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    同族专利:
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    AT511110B1|2012-09-15|
    DE102012023041B4|2021-06-02|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO1993018384A1|1992-03-06|1993-09-16|Gerard Patrick Kennedy|A leak detector for an injection moulding machine|EP2762291A1|2013-02-04|2014-08-06|ENGEL AUSTRIA GmbH|Method for the temperature control of a forming tool|
    US9457505B2|2012-12-21|2016-10-04|Engel Austria Gmbh|Method for monitoring a temperature control media supply|DE10064783A1|2000-12-22|2002-05-23|Oni Waermetrafo Gmbh|Coolant flow control method for injection molding or extrusion blow molding machines involves comparison of flow rates on the supply and take-off sides of the tool|
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    DE102009051931A1|2009-11-04|2011-05-05|Sms Siemag Ag|Method for early leak detection of cool water in a cooling device for cooling a continuous casting plant for the production of a cast metal strand, comprises detecting the pressure value of fluid by pressure sensor|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA4/2012A|AT511110B1|2012-01-02|2012-01-02|leak detection|ATA4/2012A| AT511110B1|2012-01-02|2012-01-02|leak detection|
    DE102012023041.9A| DE102012023041B4|2012-01-02|2012-11-26|Leak detection|
    CN201210572894.2A| CN103185656B|2012-01-02|2012-12-25|For monitoring the method for the register of the mould of injection machine or die casting machine|
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