EP1932791A1 - Procédé destiné à la mesure de l'effort de traction d'une bande déroulante - Google Patents

Procédé destiné à la mesure de l'effort de traction d'une bande déroulante Download PDF

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Publication number
EP1932791A1
EP1932791A1 EP06026051A EP06026051A EP1932791A1 EP 1932791 A1 EP1932791 A1 EP 1932791A1 EP 06026051 A EP06026051 A EP 06026051A EP 06026051 A EP06026051 A EP 06026051A EP 1932791 A1 EP1932791 A1 EP 1932791A1
Authority
EP
European Patent Office
Prior art keywords
wheatstone bridge
tension
sensor
measuring
cycle
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.)
Granted
Application number
EP06026051A
Other languages
German (de)
English (en)
Other versions
EP1932791B1 (fr
Inventor
Rudolf Werber
Frank Thurner
Tobias Hain
Hans- Richard Seibold
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.)
Texmag GmbH Vertriebsgesellschaft
Original Assignee
Texmag GmbH Vertriebsgesellschaft
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
Priority to AT06026051T priority Critical patent/ATE442328T1/de
Application filed by Texmag GmbH Vertriebsgesellschaft filed Critical Texmag GmbH Vertriebsgesellschaft
Priority to PL06026051T priority patent/PL1932791T3/pl
Priority to DE502006004817T priority patent/DE502006004817D1/de
Priority to EP06026051A priority patent/EP1932791B1/fr
Priority to ES06026051T priority patent/ES2332663T3/es
Priority to JP2009501975A priority patent/JP2009531680A/ja
Priority to CN2007800089615A priority patent/CN101400593B/zh
Priority to CA2642378A priority patent/CA2642378C/fr
Priority to KR1020087022849A priority patent/KR101050560B1/ko
Priority to TW096147855A priority patent/TWI366667B/zh
Priority to US12/308,348 priority patent/US7895907B2/en
Priority to PCT/EP2007/010991 priority patent/WO2008071436A1/fr
Publication of EP1932791A1 publication Critical patent/EP1932791A1/fr
Application granted granted Critical
Publication of EP1932791B1 publication Critical patent/EP1932791B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
    • B65H23/188—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H26/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms
    • B65H26/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms responsive to presence of irregularities in running webs
    • B65H26/04—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms responsive to presence of irregularities in running webs for variation in tension

Definitions

  • the invention relates to a method for measuring the tension of a moving web according to the preamble of patent claim 1.
  • a device for detecting the tension of a moving web which detects the bearing force of a web deflecting the web.
  • this device has two double bending beams, which are equipped with force transducers in the form of strain gauges. These strain gauges are connected in the form of a Wheatstone bridge in order to achieve the lowest possible temperature dependence and drift of the sensor.
  • This sensor has been well proven in practice and forms the starting point of the present invention.
  • a disadvantage of this known sensor has been found that in case of failure of the strain gauges, for example by breakage or short circuit, the entire sensor provides nonsensical values, which are then interpreted accordingly by subsequent units.
  • the sensor is included in the control loop of a web tension control, for example, it may happen, depending on the type of failure, that the control completely eliminates the web tension or greatly overstretches the running web. In the simplest case, this can lead to a web break if the web can no longer withstand the introduced tension or gets caught on machine parts due to the lack of tension. In particular, in the regulation of endless belts in paper machines, this can even lead to tearing out of rolls from their warehouses and thus a considerable risk to man and machine.
  • the invention has for its object to provide a method for measuring the tension of a moving web of the type mentioned, which also detect the failure of electronic components and can respond accordingly.
  • the method according to claim 1 is used for measuring the tension of a moving web with a sensor. It does not matter whether the train is self-contained or continuous. Also, the material of the running track plays no role in the application of this method.
  • the sensor has a Wheatstone bridge containing at least one force transducer. As load cell different sensor principles come in Question, which are able to convert a force or a mechanical deformation into an electrical signal. Strain gauges are preferably used as force sensors, which are mounted on a mechanical component - for example, a double bending beam - which is deformed by the action of the force to be measured. Basically, it is sufficient to form only a resistance of the Wheatstone bridge as a force transducer.
  • the diagonal voltage of the Wheatstone bridge is a measure of the acting force.
  • This diagonal voltage is amplified by an amplifier, which has the main task of keeping resistive loads from the Wheatstone bridge, which could distort the measurement result.
  • the amplifier can also realize a voltage gain to bring the measurement signal to an easy-to-process voltage range.
  • This amplifier outputs at its output from a signal which is proportional to a possibly to be taken into account offset the measured tensile stress and hereinafter referred to as Buchwoodssignal.
  • the Wheatstone bridge is periodically loaded by at least one resistor during the stress by the tension of the moving web by means of at least one intermittently controlled switch.
  • This load resistance detunes the Wheatstone bridge in a defined manner, wherein the effect of this load can be determined directly on the basis of a comparison of the tension signal with and without ohmic load.
  • This test is carried out in the operation of the burdened by the web sensor, so that its functioning is checked in a timely manner.
  • one of the force transducer of the loaded voltage divider should have an internal short circuit, it will be noted that the tensile signal does not change due to the stress of this voltage divider. The same applies to the case where the force transducer connected in series with the load resistor should be interrupted.
  • the force transducer which is connected in parallel to the load resistor, should have an interruption, the result is a dependence of the tension signal on the load, but this is twice as high as in the case of the functioning sensor. This can be clearly checked from the dependence of the tension signal on the load, whether the sensor is still functional is. Within certain limits, drifts of the load cells can also be detected. According to the result of this test, the error signal is then activated or deactivated. The additional output of this error signal, subsequent components such as displays or controllers can be informed of the error of the measured signal. The subsequent components that are to evaluate the tension signal can then switch on receipt of an active error signal in a mode in which they no longer evaluate the tension signal, whereby damage to people or machines are avoided.
  • both voltage dividing branches of the Wheatstone bridge have at least one force transducer
  • the stress test of only one voltage divider for determining the functionality of the sensor is insufficient.
  • both output lines of the Wheatstone bridge are loaded by at least one switch with at least one resistor. This allows the resistance values of all active elements of the Wheatstone bridge to be checked.
  • an active error signal is output.
  • the load on the Wheatstone bridge does not result in any change in the diagonal voltage compared to the unloaded case.
  • the Wheatstone bridge if the Wheatstone bridge is fully functional, it will result in a detuning of the bridge symmetry, which leads to a change in the diagonal voltage. This change depends only on the resistance values of the Wheatstone bridge in relation to the resistance value of the load resistance and is therefore a known quantity.
  • the range of values has been proven in accordance with claim 5.
  • the upper limit of this value range must not be exceeded, otherwise a correctly functioning Wheatstone bridge would be detected as defective.
  • the lower limit is given only for reasons of practicability, in particular to realize a sufficient signal-to-noise ratio of the diagonal voltage of the Wheatstone bridge. Otherwise, there is a risk that a defective Wheatstone bridge will be erroneously considered functional only due to noise.
  • revision cycle For operation of the sensor, the use of a revision cycle has been proven according to claim 10.
  • This revision cycle includes several measurement cycles of the sensor and is repeated periodically. In each revision cycle, at least one measuring cycle with a closed switch and at least one measuring cycle with an open switch is provided. This periodically outputs measured values and the entire sensor is also checked periodically.
  • a short reaction time of the sensor is important. Often, an output of a measured value is no longer sufficient for every third measuring cycle in order to guarantee a clean regulation. In this case, it is favorable according to claim 12, if in each inspection cycle more measuring cycles are provided with an open switch than with the switch closed. The sensor therefore generates useful measurement results substantially at a time interval of its cycle time, wherein at certain predetermined intervals, an internal test of the sensor is made, so that then an isolated measurement cycle for the generation of the tensile signal fails. Of course, the last generated measured value can be stored and made available to the following components in order to bridge this failure.
  • the load of the Wheatstone bridge results in an additional voltage swing in the diagonal voltage, which must be coped with by a subsequent amplifier and possibly analog-to-digital converter. This basically results in the analog-to-digital converter using part of its bit width for the load test. In case of a slight load of Wheatstone Bridge, this usually does not play a significant role. However, this results in a relatively large susceptibility to failure of the functional test of the Wheatstone bridge. If you want to use the entire dynamic range of the amplifier and the analog-to-digital converter with high significance of the functional test, it is favorable according to claim 14, when the load of the Wheatstone bridge and their supply voltage is changed. The supply voltage change is usually chosen so that it counteracts the effect of the load.
  • the supply voltage is selected in the loaded and unloaded case so that in case of a functional Wheatstone bridge in about the same diagonal voltage occurs.
  • the entire dynamic range of the amplifier and analog-to-digital converter can be used for the measurement task.
  • a change in the diagonal voltage which can be detected by the analog-to-digital converter results in this case.
  • the latter may possibly result in an overflow condition that is very easily detectable.
  • An exact measurement of the voltage swing is not required in this case, since for this purpose, only the func tion is required efficiency as a yes-no decision.
  • Wheatstone bridges each deliver diagonal voltages, which are evaluated via amplifiers and analog-to-digital converters. Both Wheatstone bridges are in the monitored as above. When an error signal occurs for one of the Wheatstone bridges, the generation of the tension signal is taken over by the other Wheatstone bridge.
  • the same principle can be realized with more than two Wheatstone bridges. In this case, the individual Wheatstone bridges are preferably prioritized or their tension signal is averaged for better accuracy. Wheatstone bridges that show an active error signal are excluded from the calculation.
  • FIG. 1 shows a sectional view through a Kraftmeßwalze 1, on which a web 2 is deflected.
  • the web 2 exerts a force 3 on the Kraftmeßwalze 1, which depends only on the tension of the web 2 and the wrap around the Kraftmeßwalze 1.
  • the force measuring roller 1 has a stationary body 4, which is connected via double bending beam 5 with a machine-fixed axis 6. Depending on the load of the force measuring roller 1 by the force 3, the double bending beams 5 are deformed more or less strongly S-shaped.
  • force transducer 7 are applied, which are preferably formed by strain gauges. These force transducers are essentially ohmic resistors which change their resistance when bent.
  • the force transducer 7 are mounted in the end regions of the double bending beam 5, where the curvature of the double bending beam 5 is strongest.
  • the stationary body 4 is connected via a roller bearing 8 with a shell 9, which forms the outer contour of the force measuring roller 1. This shell 9 is detected directly by the web 2.
  • the FIG. 2 shows a schematic diagram of a sensor 10, which detects the bearing force of the force measuring roller 1 and thus indirectly the tension of the web 2.
  • the sensor 10 has a Wheatstone bridge 11, which is formed by two voltage dividers 12, 13.
  • the voltage dividers 12, 13 are formed by the force sensors 7, which are applied to the double bending beam 5.
  • the Wheatstone bridge 11 is supplied via a changeover switch 14 'optionally with a supply voltage 14 which is formed stable and low noise. From the Wheatstone bridge 11 go two output lines 15, 16 away, between which a diagonal voltage 17 drops. This diagonal voltage 17 is the actual measurement signal, which is obtained from the force transducers 7.
  • the output lines 15, 16 are supplied to an amplifier 18, which is designed as a differential amplifier.
  • the amplifier 18 has high-impedance inputs in order not to burden the Wheatstone bridge 11 as possible. In addition, the amplifier 18 can amplify the diagonal voltage 17 by a gain factor that allows easy evaluation of the diagonal voltage 17.
  • the amplifier 18 is on the output side with an analog-to-digital converter 19 in operative connection, which generates from the output signal of the amplifier 18, a proportional thereto digital word.
  • This digital word is supplied via a bus 20 to a processor 21 in which it is processed.
  • the processor 21 can initiate a measurement cycle in the analog-to-digital converter 19 via a control line 22.
  • the processor 21 receives the information via a signal line 23 that the measurement cycle of the analog-to-digital converter 19 has been completed and that a new data word is present on the bus 20.
  • the two output lines 16, 17 can be loaded with a load resistor 26 via switches 24, 25.
  • This load resistor 26 ensures a one-sided detuning of the Wheatstone bridge 11, so that a defined change in the diagonal voltage 17 is to be expected.
  • This change in the diagonal voltage 17 is supplied via the amplifier 18 and the analog-to-digital converter 19 via the bus 20 to the processor 21, which applies corresponding mathematical operations on this data word.
  • an error signal 28 is output.
  • This error signal 28 indicates in the activated state that the Wheatstone bridge 11 is defective and therefore the output tension signal 27 is not usable.
  • the processor 21 gives the following components a handshake signal 29 to synchronize with the data output of the processor 21.
  • the processor 21 has two control outputs 30, 31, which ensure that the switches 24, 25 are closed only during a test cycle, the switches 24, 25 are not closed simultaneously, but only alternately , During a normal measuring operation, in which a new tension signal 27 is to be determined, the two switches 24, 25 are open.
  • the supply voltage 14 of the Wheatstone bridge 11 can be switched by the processor 21.
  • This switching causes a proportional change in the diagonal voltage 17, so that the voltage swing caused by the load becomes smaller. It is also thought to change the supply voltage of the Wheatstone bridge 11 so that it counteracts the load exactly. In this case, there is no load-dependent change in the diagonal voltage 17 when the Wheatstone bridge 11 is functional. In the case of a defective Wheatstone bridge 11, however, a characteristic voltage swing of the diagonal voltage 17 results in this case.
  • FIG. 3 shows a flowchart for the operation of the processor 21.
  • the two switches 24, 25 are opened and the error signal 28 is activated. This prevents a random value at the output 28 from being interpreted as a measured value.
  • the switch 25 is first opened and a measuring cycle 34 is started.
  • the measurement takes place in this case with unloaded Wheatstone bridge 11.
  • the data obtained from the measurement cycle data stored in a variable Z 0 .
  • FIG. 3 It would also be possible to start several measuring cycles 34 in succession and to output the measuring results if the error signal 28 is deactivated.
  • the variables F 1 and F 2 are compared with predefined lower threshold values U and upper threshold values O. Only in the event that both variables F 1 and F 2 are within the band defined by the thresholds U and O, the sensor 10 is interpreted as functional and the value Z 0 is output. The value of Z 0 contains the measured value with no load Wheatstone bridge 11. In addition, the error signal 28 is reset in this case, to indicate that subsequent components of the output measurement value is reliable.

Landscapes

  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
EP06026051A 2006-12-15 2006-12-15 Procédé destiné à la mesure de l'effort de traction d'une bande déroulante Active EP1932791B1 (fr)

Priority Applications (12)

Application Number Priority Date Filing Date Title
PL06026051T PL1932791T3 (pl) 2006-12-15 2006-12-15 Sposób pomiaru naprężenia rozciągającego w ruchomej taśmie
DE502006004817T DE502006004817D1 (de) 2006-12-15 2006-12-15 Verfahren zur Messung der Zugspannung einer laufenden Bahn
EP06026051A EP1932791B1 (fr) 2006-12-15 2006-12-15 Procédé destiné à la mesure de l'effort de traction d'une bande déroulante
ES06026051T ES2332663T3 (es) 2006-12-15 2006-12-15 Procedimiento para la medicion del esfuerzo de traccion de una banda movil.
AT06026051T ATE442328T1 (de) 2006-12-15 2006-12-15 Verfahren zur messung der zugspannung einer laufenden bahn
CN2007800089615A CN101400593B (zh) 2006-12-15 2007-12-14 用于对行进的网的拉伸应力进行测量的方法
JP2009501975A JP2009531680A (ja) 2006-12-15 2007-12-14 移動軌道の引張応力を測定する方法
CA2642378A CA2642378C (fr) 2006-12-15 2007-12-14 Procede pour mesurer l'effort de tension d'une bande de materiau defilante
KR1020087022849A KR101050560B1 (ko) 2006-12-15 2007-12-14 가동중인 웹의 인장응력 측정 방법
TW096147855A TWI366667B (en) 2006-12-15 2007-12-14 Method for measuring the tensile stress of a running web
US12/308,348 US7895907B2 (en) 2006-12-15 2007-12-14 Method of measuring the tensile stressing of a moving web
PCT/EP2007/010991 WO2008071436A1 (fr) 2006-12-15 2007-12-14 Procédé pour mesurer la tension d'une bande de matériau défilante

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06026051A EP1932791B1 (fr) 2006-12-15 2006-12-15 Procédé destiné à la mesure de l'effort de traction d'une bande déroulante

Publications (2)

Publication Number Publication Date
EP1932791A1 true EP1932791A1 (fr) 2008-06-18
EP1932791B1 EP1932791B1 (fr) 2009-09-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP06026051A Active EP1932791B1 (fr) 2006-12-15 2006-12-15 Procédé destiné à la mesure de l'effort de traction d'une bande déroulante

Country Status (12)

Country Link
US (1) US7895907B2 (fr)
EP (1) EP1932791B1 (fr)
JP (1) JP2009531680A (fr)
KR (1) KR101050560B1 (fr)
CN (1) CN101400593B (fr)
AT (1) ATE442328T1 (fr)
CA (1) CA2642378C (fr)
DE (1) DE502006004817D1 (fr)
ES (1) ES2332663T3 (fr)
PL (1) PL1932791T3 (fr)
TW (1) TWI366667B (fr)
WO (1) WO2008071436A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110054025A (zh) * 2019-01-17 2019-07-26 天长市恒鑫机电设备有限公司 一种金属线收卷装置

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DE102005003632A1 (de) 2005-01-20 2006-08-17 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Katheter für die transvaskuläre Implantation von Herzklappenprothesen
PL1927834T3 (pl) * 2006-12-02 2010-10-29 Texmag Gmbh Vertriebsgesellschaft Walec z czujnikiem siły
JP7184698B2 (ja) * 2019-03-29 2022-12-06 株式会社レプトリノ 力覚センサ
CN110646129B (zh) * 2019-09-12 2024-04-05 上海建工集团股份有限公司 一种电阻式拉索索力测量装置及方法

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GB600085A (en) * 1945-06-25 1948-03-31 Cyril George Hawkins Improvements in or relating to electrically-driven web-winding equipment
EP0582947A1 (fr) * 1992-08-13 1994-02-16 KOENIG & BAUER-ALBERT AKTIENGESELLSCHAFT Dispositif de mesure de la tension dans une bande
DE10118887C1 (de) 2001-04-18 2002-08-01 Erhardt & Leimer Gmbh Vorrichtung zum Erfassen der Spannkraft einer laufenden Warenbahn

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Publication number Priority date Publication date Assignee Title
GB600085A (en) * 1945-06-25 1948-03-31 Cyril George Hawkins Improvements in or relating to electrically-driven web-winding equipment
EP0582947A1 (fr) * 1992-08-13 1994-02-16 KOENIG & BAUER-ALBERT AKTIENGESELLSCHAFT Dispositif de mesure de la tension dans une bande
DE10118887C1 (de) 2001-04-18 2002-08-01 Erhardt & Leimer Gmbh Vorrichtung zum Erfassen der Spannkraft einer laufenden Warenbahn

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CN110054025A (zh) * 2019-01-17 2019-07-26 天长市恒鑫机电设备有限公司 一种金属线收卷装置

Also Published As

Publication number Publication date
US7895907B2 (en) 2011-03-01
CN101400593B (zh) 2011-03-02
EP1932791B1 (fr) 2009-09-09
ES2332663T3 (es) 2010-02-10
ATE442328T1 (de) 2009-09-15
KR101050560B1 (ko) 2011-07-19
WO2008071436A8 (fr) 2008-07-24
TW200842094A (en) 2008-11-01
KR20080107419A (ko) 2008-12-10
DE502006004817D1 (de) 2009-10-22
TWI366667B (en) 2012-06-21
PL1932791T3 (pl) 2010-02-26
CA2642378C (fr) 2011-05-31
WO2008071436A1 (fr) 2008-06-19
JP2009531680A (ja) 2009-09-03
CN101400593A (zh) 2009-04-01
US20090288500A1 (en) 2009-11-26
CA2642378A1 (fr) 2008-06-19

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