EP1913340A1 - Systeme de mesure - Google Patents

Systeme de mesure

Info

Publication number
EP1913340A1
EP1913340A1 EP06761253A EP06761253A EP1913340A1 EP 1913340 A1 EP1913340 A1 EP 1913340A1 EP 06761253 A EP06761253 A EP 06761253A EP 06761253 A EP06761253 A EP 06761253A EP 1913340 A1 EP1913340 A1 EP 1913340A1
Authority
EP
European Patent Office
Prior art keywords
signal
tool
signals
measuring arrangement
output signals
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.)
Withdrawn
Application number
EP06761253A
Other languages
German (de)
English (en)
Inventor
Reinhard Bosshard
Paul Engeler
Ernst Pletscher
Max P. Waser
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.)
Kistler Holding AG
Original Assignee
Kistler Holding AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kistler Holding AG filed Critical Kistler Holding AG
Publication of EP1913340A1 publication Critical patent/EP1913340A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
    • G01D3/02—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for altering or correcting the law of variation
    • G01D3/021—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for altering or correcting the law of variation using purely analogue techniques

Definitions

  • the invention relates to a measuring arrangement, a method for signal transmission of a measured variable, and a measuring station for performing the method according to the preamble of the independent claim of the respective category.
  • the evaluation unit must, in addition to the pure information about the operating state of the machine tool and the acquired measurement data as such, in some cases also data on the production process in the machine tool, the produced
  • connection between the machine tool or another system and the evaluation unit must also meet high requirements for simple and safe operation. This means that it must be ensured that, for example, less highly qualified operating personnel are able to safely and quickly disconnect and / or produce the connection between the machine tool and the evaluation unit, for example when changing tools without, for example, confusing Cable connections, measuring channels, etc. is possible, which can lead to the fact that measured data, for example, incorrectly recorded or misinterpreted by the evaluation unit. In particular, an exchange of signal lines between the machine tool and the evaluation unit must be prevented at all costs.
  • the mistery see a measuring line with a line for the supply of electrical energy can result in the worst case, the destruction of the sensor units of the machine tool and / or a defect in the evaluation, which can lead to stoppage of production and be associated with massive economic damage can.
  • a machine tool such as a machine tool for the production of plastic parts
  • a piezoelectric sensor can provide a signal in the form of electrical charge shifts, a thermocouple a voltage signal, which still depends on the material of the feed line between the thermocouple and evaluation
  • a third sensor could be, for example, a resistance sensor, such as a PT-1000 Temperature sensor or a piezoresistive sensor, which makes the exchange of electrical current and voltage signals necessary in a bridge circuit.
  • connection cable for the connection between a machine tool and the associated evaluation unit is delivered, it is extremely difficult for the customer, for example, to adapt the length of the cable to the local conditions.
  • Another problem that is often not completely independent of the other problems described is that one and the same sensor requires more than a so-called measuring channel for signal transmission, whereby the cable connections between, for example, the machine tool for producing plastic injection-molded parts, and the associated evaluation is even more expensive.
  • a Wheatstone bridge of electrical resistors and / or piezoresistive elements and / or resistance thermometers in addition to a ground line or a "ground" line still Have three more signal terminals, which are to be transmitted separately via a connecting line between the machine tool and evaluation.
  • the same often applies to combination sensors or other sensors or sensors, all of which are well known to the person skilled in the art and need not be listed and discussed individually here.
  • connection cables are not solved, the problems of likelihood of confusion of the connection cables are not solved, the occurrence when in externally identical connection systems, i. Different or different types of measuring signals must be transmitted with the same connection plugs and signal cables.
  • the invention thus relates to a measuring arrangement for attachment to a tool comprising a first sensor for measuring a first measured variable and a second sensor for measuring a second measured variable, wherein in the operating state of the first sensor generates a first measurement signal and the second sensor generates a second measurement signal, and the first measurement signal is typi-different from the second measurement signal or can be.
  • the measuring arrangement comprises a signal converter connected to an output interface so that the first measurement signal and / or the second measurement signal can be converted into two output signals of the same type, and the output signal can be fed to the evaluation unit via the output interface, which is signal-connected to an evaluation unit via a signal line ,
  • a signal converter connected in a signal-connected manner to an output interface is provided so that two different-type measurement signals can be converted into two identical output signals.
  • thermocouple for measuring a temperature
  • the thermocouple In order to correctly evaluate the thermoelectric voltage supplied by the thermocouple, the thermocouple must be contacted with an electrical lead made of an alloy of specific composition (equalizing lead), as otherwise contact voltages may occur which will result in the measurement of a wrong temperature.
  • the measurement signal of the piezoelectric sensor which essentially carries an electrical charge signal, is particularly susceptible to disturbances, such as electrical crosstalk from another signal line, which is a third Signal carries, for example, an electrical AC voltage or an alternating electrical current.
  • the present invention avoids all of these disadvantages, since the first measurement signal and / or the second measurement signal can be converted into two output signals of the same type by means of the signal converter which is provided in the measurement arrangement itself before it is signal-connected via the output interface, which is signal-connected to an evaluation unit. eg is supplied in the form of an electrical and / or acoustic and / or optical signal via the signal line to the evaluation unit.
  • a measuring arrangement can be configured such that the signal converter converts all signals to be exchanged between the tool and the evaluation unit into a current signal.
  • the signal converter converts all signals to be exchanged between the tool and the evaluation unit into a current signal.
  • a piezoelectric sensor and / or a piezoresistive sensor is provided in the machine tool for temperature measurement, a thermocouple and a PT1000 is necessary for technical reasons and, moreover, from a data memory located in the machine tool. drive data and data can be exchanged via the tool itself between the evaluation unit and the tool.
  • the type-different signals which supply the aforementioned components that is, the charge signal of the piezoelectric sensor, the voltage or current signal of the piezoresistive sensor and the PT100, and the digital signals from the data memory are stored in the transducer, e.g. converted into a current signal that can then be reliably transmitted via the signal line between the output interface and evaluation unit.
  • the tool has to be exchanged in a certain production step, this can be done by using the same Wiring done because the other tool also includes a transducer that converts the signals to be transmitted again, for example, in a current signal of the same type, as provided by the first tool also.
  • the first sensor and / or the second sensor is a pressure sensor, in particular a piezoelectric or a piezoresistive pressure sensor and / or a temperature sensor, in particular a thermocouple and / or a piezoresistive temperature sensor and / or a Resistance thermometer and / or a combination sensor.
  • the first measurement signal and / or the second measurement signal may be an electrical charge, an electrical voltage, an electrical current, a thermal voltage and / or another electrical measurement signal.
  • the two or more identical output signals may also be an optical output signal or an acoustic output signal or an electrical output signal, in particular an electrical voltage or an electric current, depending on whether the signal converter is an optical, an acoustic or an electrical signal converter.
  • a data carrier connected to the output interface is provided with system information, the system information including sensor information and / or information of the signal converter and / or tool information and / or product information and / or is a process information and / or a look-up table and or a reference or calibration curve.
  • a signal carrying the system information from the signal converter is preferably convertible into the output signal of the same type.
  • a multiplex device in particular a time multiplexer and / or a frequency multiplexer is provided for transmitting the output signal.
  • the two or more type-like output signals provided by the signal converter can be transmitted essentially via a single signal line between the measuring arrangement and the evaluation unit.
  • the output interface may be an Ethernet interface so that data transfer between the evaluation unit and the machine tool may be via an internal computer network or even over the Internet. This completely eliminates the need for separate cabling between the evaluation unit and the machine tool, and it is completely impossible to confuse the cable connectors between the machine tool and the evaluation unit.
  • the invention further relates to a method for signal transmission of a measured variable of a sensor of a measuring arrangement, which measuring arrangement comprises a first sensor with which a first measured variable is measured and a second sensor which a second measured variable is measured comprises.
  • the first sensor generates a first measurement signal
  • the second sensor generates a second measurement signal, the first measurement signal being different in type from the second measurement signal.
  • the measuring arrangement for carrying out the method according to the invention comprises a signal converter which is signal-connected to an output interface, wherein the signal converter converts the first and / or the second measurement signal into two outputting signals of the same type and the output signal via the output interface, which is signal-connected to an evaluation unit via a signal line is, the evaluation unit is supplied.
  • the sensors are interchangeable. Instead of a pressure sensor can be connected later, for example, a temperature sensor. In particular, active sensors are used for these applications, which do not require power.
  • Characteristic of this inventive measuring arrangement is that the measured variables are measured simultaneously. Accordingly, the output signals can also be transmitted simultaneously and in real time.
  • the measuring device including transducer is mounted in or on the tool, it is possible to use single-wire technique, since the tool has a shielding effect. This can be dispensed with expensive shielded lines, which makes the measuring arrangement much cheaper.
  • the measuring arrangement can have eight or more measuring channels for connection to as many interchangeable sensors.
  • the first measurement signal and / or the second measurement signal in an optical output signal, and / or in an acoustic output signal and / or in an electrical output signal, in particular in an electrical voltage and / or converted into an electric current.
  • the output signal is processed in a multiplex device prior to transmission via the output interface to the evaluation unit, in particular a time division multiplexing and / or a frequency multiplexing of the output signal is performed.
  • the output signals can also be converted into a network format by means of an electronic circuit and transmitted to the evaluation unit via a network connection, wherein the network connection can be an Ethernet, an RS 232, an IEEE, a CAN bus or a CAN operator.
  • the invention further relates to a measuring station for carrying out a method according to the invention, wherein the measuring station comprises a tool with a measuring arrangement as described above.
  • the tool is in particular an internal combustion engine, a refrigeration machine, a scientific tool, in particular a scientific experimental setup, or another tool, in particular an injection molding tool.
  • the tool can also be any other tool in which different types of signals occur that have to be exchanged with an evaluation unit.
  • Fig. 1 is a known from the prior art tool
  • FIG. 2 shows a schematic representation of a first exemplary embodiment of a measuring arrangement according to the invention
  • FIG. 3 shows a two-part tool in a measuring arrangement according to the invention
  • FIG. 4 shows a measuring arrangement with a thermally decoupled housing.
  • the tool 100 for example, an injection molding tool for May be the production of plastic molds, including a first sensor 2 'which for example is a thermocouple and f a combination sensor 3, which may be a piezoelectric, for example, and / or piezo-resistive and / or on the other combination sensor and, for example comprises a voltage signal and provides a charge signal.
  • a first sensor 2 ' which for example is a thermocouple and f
  • a combination sensor 3 which may be a piezoelectric, for example, and / or piezo-resistive and / or on the other combination sensor and, for example comprises a voltage signal and provides a charge signal.
  • an energy distributor E ' is provided in the tool 100' to which electrical energy can be supplied via a signal line 4 ', which is made available to the energy distributor E' via a separate signal line 400 'from the evaluation unit and to the energy distributor E' the various sensors 2 ', 3' and / or to the disk DT 'distributed.
  • the electrical signals which the tool 100 'has to exchange with the evaluation unit, not shown, are several different types of electrical signals.
  • the thermocouple 2 ' supplies an electrical voltage
  • the piezo combination sensor 3' supplies an electrical voltage and an electrical charge signal
  • the data carrier DT 'exchanges with the evaluation unit via a pulsed electrical alternating voltage The power distributor E 'must finally be supplied via its signal line 400' with a specific DC electrical power.
  • a plurality of signal lines 400 'must be provided which can be constructed either identically or differently and must each be connected to the machine tool via different output interfaces.
  • the sensor signals 21 ', 31' are transmitted to the evaluation unit via one and the same signal line 400 ', which is signal-connected to the tool 100' at an output interface 4 '.
  • shielding measures 401 ' must be taken, in the present case coaxial cable 401' in order to shield the various sensor signals 21 ', 31' and the signals of the data carrier DT 'from each other, so that no crosstalk of the signals, that is, no electromagnetic exchange of the signals take place among each other can, what would distort the signals. It is also the case that, for reasons of economy, as few as possible different signal lines 400 'are used.
  • the signal line 400 'of the data carrier DT' is identical to the power supply line 400 'of the energy distributor E'.
  • the signal line 400' of the data carrier DT ' will be inadvertently connected to the power distributor E', and the electrical power supply for the tool 100 'will be connected to the data carrier DT', causing destruction on the one hand of the data carrier DT 'and on the other hand can damage the evaluation unit.
  • FIG. 2 shows a schematic illustration of a first exemplary embodiment of a measuring arrangement according to the invention, which is referred to in the following as the entire reference numeral 1.
  • the measuring arrangement of FIG. 2 comprises a tool 100, in particular a machine tool 100 in the form of an injection molding machine. Casting machine 100 for plastic parts, eg for plastic parts from the medical field such as syringes, packaging material or other products.
  • the machine tool 100 is signal-connected via a single signal line 400 to an evaluation unit 6, which may comprise, for example, a data processing system in addition to other devices.
  • the signal line 400 comprises a shielding measure 401 which preferably defines the evaluation unit and the machine tool to a common electrical ground potential G.
  • the machine tool 100 in the example shown in FIG. 1 comprises a first sensor 2, which is a thermocouple 2 and a second sensor 3, which is a piezoresistive pressure sensor 3.
  • the thermocouple 2 supplies a thermoelectric voltage 21, while the piezoresistive pressure sensor 3 supplies an electrical voltage and / or current signal 31.
  • the two sensors 2, 3 thus supply at least two different types of electrical measuring signals 21, 31.
  • a signal converter 5 is provided in the machine tool 100, which converts the two type-different measuring signals 21, 31 into two output signals 211, 311 of the same type, for example in FIG two impressed currents 211, 311 of in each case a maximum of 40 mA, each of which is supplied as pulsed or non-pulsed DC voltage signal 211, 311 via the output interface 4, which is a simple two-pin plug 4, via the shielded signal line 400 of an evaluation unit 6. Because the measuring signals 21, 31 have been converted by the signal converter 5 into the impressed currents 211, 311, the signal line 400 does not need any special requirements with respect to the material from which the cables of the signal line 400 are made, or along their length or other special features. Virtually any electrical line can be used as the signal line 400, which only has to have the correct connections for connection to the output interface 4.
  • the signal line 400 is connected to the output interface 4 via a single connection, for example via a single connector, swapping the two output signals 211 and 311 is completely impossible. Since the measurement signals 21 and 31 have been converted into the robust output signals 211, 311 in the form of simple current signals 211, 311 by the signal converter 5, no special requirements are imposed on the signal line 400. This means that it is possible to use very inexpensive signal lines 400, which can be assembled by the user himself in any desired manner, for example adapted in length to the conditions on site.
  • FIG. 3 schematically shows a further embodiment of a two-part tool 100 of a measuring arrangement 1 according to the invention.
  • the tool 100 of FIG. 3 is a two-part injection molding tool 100, as well known to those skilled in many different embodiments for the production of injection molded parts.
  • the injection molding tool 100 is signal-connected via the output interface 4, which may be, for example, a multipolar plug connection 4, and the signal line 400, which is shown in simplified form in FIG. 3 as an arrow, with the evaluation unit 6.
  • the injection molding tool 100 is a two-part tool 100 having a first tool half 101 and a second tool half 102, which in certain operating states of the injection molding tool 100 are movable relative to each other.
  • each sensors 2, 3 are provided, which can provide the same type or different types, ie not the same type signals.
  • a data carrier DT is provided, which may contain, for example, information about the process flow, eg a look-up table, reference curves or other data, information on the nature and function of the tool 100, data or information about or via the Production process and / or product information and much more.
  • a signal converter 5 is provided, for example, in the second tool half 101 of the injection molding tool 100, to which both the type-different measuring signals 21, 31 from the first tool half 101, as well as the type-different measuring signals 21, 31 and the signals of the data carrier DT can be fed, so that all these signals can be converted by the signal converter 5 into the same type output signals 211, 311 and the evaluation unit 6 can be supplied via the single signal line 400.
  • the invention for connecting the tool 100 to the evaluation unit 6 requires only a single signal line 400, via which the different, type-different original measurement signals 21, 31 of the sensors 2, 3 are transferable in the same type of type.
  • a measuring arrangement with a thermally and / or elastically decoupled housing 7 is shown schematically as a further exemplary embodiment.
  • This particular embodiment of a measuring arrangement 1 according to the invention can be used particularly advantageously if it is a tool 100, in which Very high temperatures arise in the drive state, which can lead to harmful effects for the signal converter 5 and / or the data medium DT and / or for other components provided with the measured value conversion or measured value transmission.
  • a separate housing 7 is provided in which, for example, the data carrier DT and the signal converter 5 are provided.
  • sensors 2, 3 may also be provided in the housing 5.
  • a multiplex device 8 is additionally provided, which, as is well known to the person skilled in the art, may be, inter alia, a frequency multiplexer 8 or a time multiplexer 8, so that the output signals converted by the signal converter 5 from the measuring signals 21, 31 211, 311, time or frequency are processed via the output interface 4 and the signal line 400 via a single line connection to an evaluation unit, not shown in FIG. 4 can be fed.
  • the signal converter 5 can not only convert the measuring signals 21, 31 into electrical output signals 211, 311, but can also convert these into optical, acoustic or other output signals 211, 311, for example, and the multiplexing device can also be acoustical , optical or other multiplexing device may be.
  • the exemplary embodiment of a measuring arrangement 1 according to the invention shown in FIG. 4 is particularly suitable when high temperatures prevail in the tool 100 itself, which comprises all or part of the sensors 2, 3, and / or strong mechanical loads, for example very strong vibrations occur.
  • the aforementioned components to be protected are housed in a separate housing 7, which thermal and / or mechanical decoupling means 9 is decoupled from the tool 100.
  • the thermal decoupling means 9 can be configured in various ways. It may, for example, be good or poorly heat-conducting elements, such as rigid or flexible bushings 9 or spring elements 9 made of metal or plastic. Thermally conductive or resilient layers, or composites, may be provided between housing 7 and a surface of tool 100, or any other suitable means to ensure adequate mechanical and / or thermal decoupling.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Technology Law (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Testing Or Calibration Of Command Recording Devices (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un système de mesure à monter sur ou dans un outil (100), notamment dans un outil de moulage par injection, qui comprend deux capteurs (2, 3) remplaçables ou davantage, pour mesurer de manière simultanée des grandeurs à mesurer. En service, chaque capteur (2, 3) produit un signal de mesure (21, 31), au moins deux signaux de mesure (21, 31) pouvant être de type différent. A cet effet, le système de mesure comprend un convertisseur de signaux (5) avec une interface de sortie (4). Tous les signaux de sortie (211, 311) de type identique peuvent être convertis dans le convertisseur de signaux (5). Ces signaux de sortie (211, 311) peuvent être transmis à une unité d'évaluation (6) par l'intermédiaire de l'interface de sortie (4) au moyen d'une ligne de signalisation (400) amovible.
EP06761253A 2005-08-10 2006-08-03 Systeme de mesure Withdrawn EP1913340A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH13242005 2005-08-10
PCT/CH2006/000402 WO2007016799A1 (fr) 2005-08-10 2006-08-03 Systeme de mesure

Publications (1)

Publication Number Publication Date
EP1913340A1 true EP1913340A1 (fr) 2008-04-23

Family

ID=36572189

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06761253A Withdrawn EP1913340A1 (fr) 2005-08-10 2006-08-03 Systeme de mesure

Country Status (4)

Country Link
US (1) US7880632B2 (fr)
EP (1) EP1913340A1 (fr)
JP (1) JP5222141B2 (fr)
WO (1) WO2007016799A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5158218B2 (ja) * 2011-01-10 2013-03-06 株式会社デンソー 液面レベル計測装置
DE102012219501A1 (de) * 2012-10-25 2014-04-30 BSH Bosch und Siemens Hausgeräte GmbH Sensoranordnung für eine Haushaltsgerät sowie ein Haushaltsgerät mit einer derartigen Sensoranordnung
EP3133700B1 (fr) 2015-08-20 2019-10-16 Kistler Holding AG Interface de cablage pour une machine de production de l'industrie de traitement du plastique et procédé de reequipement d'une telle machine de production
KR101848070B1 (ko) 2017-11-02 2018-04-11 (주)대흥이에스티 공작기계용 변위 감지장치
EP3786590A1 (fr) * 2019-08-29 2021-03-03 Siemens Aktiengesellschaft Élément capteur et dispositif de détection de paramètres de processus dans une installation de frittage

Citations (1)

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Publication number Priority date Publication date Assignee Title
EP0960012B1 (fr) 1997-02-12 2005-08-24 American MSI Corporation Systeme de transmission de donnees pour moule a injection

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JPH01196518A (ja) * 1988-01-30 1989-08-08 Dainippon Printing Co Ltd センサカード
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Non-Patent Citations (1)

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Title
See also references of WO2007016799A1

Also Published As

Publication number Publication date
JP2009505176A (ja) 2009-02-05
US7880632B2 (en) 2011-02-01
US20080204265A1 (en) 2008-08-28
WO2007016799A1 (fr) 2007-02-15
JP5222141B2 (ja) 2013-06-26

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