EP2620545A1 - Verfahren und Anordnung zur Kraftmessung in Verbindung mit einer Fertigungsmaschine - Google Patents

Verfahren und Anordnung zur Kraftmessung in Verbindung mit einer Fertigungsmaschine Download PDF

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Publication number
EP2620545A1
EP2620545A1 EP12152451.6A EP12152451A EP2620545A1 EP 2620545 A1 EP2620545 A1 EP 2620545A1 EP 12152451 A EP12152451 A EP 12152451A EP 2620545 A1 EP2620545 A1 EP 2620545A1
Authority
EP
European Patent Office
Prior art keywords
measurement
connection
force
strain gauges
arrangement
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Withdrawn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
EP12152451.6A
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English (en)
French (fr)
Inventor
Eero Suomi
Juhani Toppari
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.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
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 Metso Paper Oy filed Critical Metso Paper Oy
Priority to EP12152451.6A priority Critical patent/EP2620545A1/de
Publication of EP2620545A1 publication Critical patent/EP2620545A1/de
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/002—Opening or closing mechanisms; Regulating the pressure
    • D21G1/004—Regulating the pressure
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/0073—Accessories for calenders
    • D21G1/008—Vibration-preventing or -eliminating devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0045—Paper-making control systems controlling the calendering or finishing

Definitions

  • the invention relates to a method and an arrangement for force measurement in connection with a manufacturing machine, in particular in connection with a device, especially a finishing device such as a calender, of a fiber web production line. More especially the invention relates to a method according to the preamble part of claim 1 and to an arrangement according to the preamble part of claim 9 and to a calender according to the preamble part of claim 14.
  • a roll arrangement which arrangement comprises a hydraulically supported bottom roller having rotating hollow cylinder and a stationary crosshead extending lengthwise through the cylinder to form a clearance space therewith.
  • the ends of the crossheads are supported by force exerting devices.
  • the forces producing the line pressure of the roll are transferred through a hydraulic supporting device, such as a hydraulic fluid contained within a longitudinal pressure chamber in the crosshead, to inner circumference of the hollow cylinder.
  • a corresponding reduction of the pressure in the force exerting devices to permit separation of the rollers occurs only after a sensor, such as dynamometer, has determined that the load on the crosshead has been substantially removed.
  • a sensor is provided for detecting the bending or deflection of the crosshead.
  • the deflection and loading of the crossheads are directly related. For example, when the deflection equals zero, then the load also equals zero.
  • a control system operable in response to a sensor that detects the deflection of the crosshead is disclosed.
  • the sensor may comprise a position encoder or a strain gauge arrangement.
  • An object of the present invention is to created a method and an arrangement for force measurement in which the disadvantages of prior art are eliminated or at least minimized.
  • a further object of the invention is to provide created a method and an arrangement for force measurement in which the problems relating to over load situations will create neither problems nor the sensor is sensible of breakage.
  • the method according to the invention is mainly characterized by the features of characterizing part of claim 1.
  • the arrangement according to the invention is mainly characterized by the features of characterizing part of claim 9.
  • the arrangement according to the invention is mainly characterized by the features of characterizing part of claim 14.
  • force measurement data is created by at least two measurement of lower exactness and / or by process information data for example by pressure of a hydraulic cylinder.
  • a mechanical model is created and by measurement data from different locations of the measurement target measured advantageously by strain gauges, the force is determined continuously.
  • the mechanical model is for example based on FEM-model, in which the critical deformation areas and other sensitive areas are shown.
  • vibration information is received when measuring and the resonance areas of vibration can be avoided, since the strikes can be noted based when measurement results are combined with history data of deformations.
  • indirect force measurement is achieved by at least two strain gauges whose state varies under varying loading situations as the structures will be in different deformation state and thus the stain gauges are either under tension or under compression and by measurement result of the strain gauges located in connection with frame parts or corresponding structures of the force measurement target. Force is determined by using weighting by predictive optimization.
  • At least two or advantageously more strain gauges preferably at least three strain gauges are used.
  • the weighting coefficient for each strain gauge can be determined by calculation for example based on earlier date and reliable force measurement value is achieved. Also a measurement sensor can be used for calibrating the weighting coefficients.
  • Strain gauges are of small size and they do not have special requirements for space in mounting points. Measurement of strain gauges is based on the deformation of the target to be loaded and on the measurement of that. In such the principles of measurement by strain gauges are known. One major advantage is that the sensor is not sensible of over load situations, since the force to be measured does not focus directly on it.
  • measuring by strain gauges is continuous and the measurement results are transmitted to diagnostics and control part of the machine for controlling the loading operation, controlling the operation such that vibration resonance points are avoided and machine parts of lower condition will be replaced.
  • the invention is used in connection with force measurement of fiber web machine, especially in connection with a calender of a fiber web machine in continuous measurement of nip forces with help of loading cylinders.
  • the invention is also well suited to be used in connection with crushing devices.
  • Figure 1 discloses schematically in connection with a calender an example of force measurement arrangement according to the invention.
  • the calender 10 of a fiber web machine comprises two calender rolls 11, 12 in between of which rolls 11, 12 is calendering nip N.
  • the calendering force i.e. the nips force NF is provided for calendering a fiber web.
  • the frame parts of the calender 10 are indicated by reference numerals 21, 22, 23, 24, 25, 26.
  • the frame parts comprise an upper support arm 21 for the upper calender roll 11, a top frame part 23 for supporting the upper support arm 21, a vertical frame part 24 for vertical support of the calender 10, a bottom frame plate 25 for horizontal support of the calender 10, a lower support arm 22 for the lower calender roll 12, and a support arm 26 for supporting the lower support arm 22.
  • At least two strain gauges 31, 32, 33, 34, 35 are located in connection with frame parts of the calender 10.
  • One strain gauge 31 is located in connection with the top frame part 23
  • one strain gauge 32 is located in the connection area of the top frame part 23 and the vertical frame part
  • one strain gauge 33 is located in connection with the vertical frame part
  • one strain gauge 34 is located in connection with the lower support arm 22
  • one strain gauge 35 is located in connection area of the lower support arm 22 and the bottom frame plate 25.
  • the strain gauges 31, 32, 33, 34, 35 give the indication and measurement values m1...m5 of any deformation in the respective frame part / frame parts.
  • the nip force NF is calculated based on the measurement values m1...m5
  • Coefficients f1...f5 take into account scaling and reliability of each measurement.
  • strain gauges are at least two but with more strain gauges more exact results are achieved. Also it is possible to use not all of the strain gauges at the same time and also the locations of strain gauges can be varied.
EP12152451.6A 2012-01-25 2012-01-25 Verfahren und Anordnung zur Kraftmessung in Verbindung mit einer Fertigungsmaschine Withdrawn EP2620545A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12152451.6A EP2620545A1 (de) 2012-01-25 2012-01-25 Verfahren und Anordnung zur Kraftmessung in Verbindung mit einer Fertigungsmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12152451.6A EP2620545A1 (de) 2012-01-25 2012-01-25 Verfahren und Anordnung zur Kraftmessung in Verbindung mit einer Fertigungsmaschine

Publications (1)

Publication Number Publication Date
EP2620545A1 true EP2620545A1 (de) 2013-07-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP12152451.6A Withdrawn EP2620545A1 (de) 2012-01-25 2012-01-25 Verfahren und Anordnung zur Kraftmessung in Verbindung mit einer Fertigungsmaschine

Country Status (1)

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EP (1) EP2620545A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107066658A (zh) * 2016-12-23 2017-08-18 中国船舶工业集团公司第七0八研究所 一种悬臂横梁支撑的甲板纵骨梁柱屈曲的载荷‑端缩曲线确定方法
WO2023156705A1 (en) 2022-02-16 2023-08-24 Etteplan Oyj A sensor device for detecting deformation of nip rolls

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3331313A (en) 1965-09-24 1967-07-18 Black Clawson Co Calender stacks having transverse pressure sensing and adjustment means
US4991499A (en) 1988-05-06 1991-02-12 Eduard Kusters Maschinenfabrik Gmbh & Co Kg Rollapparatus having an improved quick release device
WO1999025921A1 (en) * 1997-11-17 1999-05-27 Valmet Corporation Method for detecting contamination and/or damaging of a face that runs through a nip or nips in a calender for paper
DE10125379A1 (de) * 2001-05-23 2002-11-28 Voith Paper Patent Gmbh Vorrichtung zum gegenseitigen Andrücken zweier Walzen in einem Streichwerk

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3331313A (en) 1965-09-24 1967-07-18 Black Clawson Co Calender stacks having transverse pressure sensing and adjustment means
US4991499A (en) 1988-05-06 1991-02-12 Eduard Kusters Maschinenfabrik Gmbh & Co Kg Rollapparatus having an improved quick release device
WO1999025921A1 (en) * 1997-11-17 1999-05-27 Valmet Corporation Method for detecting contamination and/or damaging of a face that runs through a nip or nips in a calender for paper
DE10125379A1 (de) * 2001-05-23 2002-11-28 Voith Paper Patent Gmbh Vorrichtung zum gegenseitigen Andrücken zweier Walzen in einem Streichwerk

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107066658A (zh) * 2016-12-23 2017-08-18 中国船舶工业集团公司第七0八研究所 一种悬臂横梁支撑的甲板纵骨梁柱屈曲的载荷‑端缩曲线确定方法
CN107066658B (zh) * 2016-12-23 2021-07-23 中国船舶工业集团公司第七0八研究所 一种甲板纵骨梁柱屈曲的载荷-端缩曲线确定方法
WO2023156705A1 (en) 2022-02-16 2023-08-24 Etteplan Oyj A sensor device for detecting deformation of nip rolls

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