EP0660898B1 - Vorrichtung zur bruchdetektion einer bahn - Google Patents

Vorrichtung zur bruchdetektion einer bahn Download PDF

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Publication number
EP0660898B1
EP0660898B1 EP93924356A EP93924356A EP0660898B1 EP 0660898 B1 EP0660898 B1 EP 0660898B1 EP 93924356 A EP93924356 A EP 93924356A EP 93924356 A EP93924356 A EP 93924356A EP 0660898 B1 EP0660898 B1 EP 0660898B1
Authority
EP
European Patent Office
Prior art keywords
transducer
vacuum
sheet
sheet break
vacuum level
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.)
Expired - Lifetime
Application number
EP93924356A
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English (en)
French (fr)
Other versions
EP0660898A1 (de
Inventor
Jeffrey H. Pulkowski
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.)
Beloit Technologies Inc
Original Assignee
Beloit Technologies Inc
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 Beloit Technologies Inc filed Critical Beloit Technologies Inc
Publication of EP0660898A1 publication Critical patent/EP0660898A1/de
Application granted granted Critical
Publication of EP0660898B1 publication Critical patent/EP0660898B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/04—Paper-break control devices

Definitions

  • the present invention relates to a sheet break detector apparatus, for detecting a sheet break in a dryer section of a paper machine, as defined in the preamble of claims 1 and 9. More particularly, the present invention relates to a sheet break detector for particular application to a dryer section having no open draws therein.
  • Bel-Champ is a common law trademark of Beloit Corporation.
  • the Bel-Champ TM single tier drying section has provided a means for drying alternate sides of a web of paper without subjecting the paper to the long open draws typically incorporated into a conventional two-tier, double felted dryer section.
  • a reliable sheet break detector would sense the absence of a web and would initiate a dropping of the sheet upstream relative to the dryer section, thereby preventing excessive wrapping of a dryer cylinder.
  • the Bel-Champ TM concept does not include any open draws. Therefore, the employment of a conventional sheet break detector is not possible.
  • a prior art break detection method includes an optical sensor to determine if a web is present.
  • a light emitter is located on one side of the web and a receiver on the other. When a web is running between the emitter and receiver, the passage of light is obstructed, indicating the presence of the web.
  • an optical sensor includes an emitter and a receiver.
  • the emitter and receiver are located on the same side of the web.
  • Such configuration utilizes reflected light rather than transmitted light in order to detect the presence of a web.
  • the senor is of a type that can detect a color difference. Therefore, in order for the aforementioned method to be effective, a colored felt must be used.
  • the sensor senses the color difference between a felt and a sheet of paper so that in the event of a sheet break, such color difference is sensed by the sensor.
  • optical sensors are sensitive to dust and the build-up of dirt on the light sensitive lenses thereof.
  • Such build-up of dust and dirt restricts the passage of light, thus indicating the presence of a web even when the web is absent due to a web breakage.
  • a false indication occurs, there can be a significant amount of paper wrapped up on a dryer before a sheet break is discdvered. Cleaning the wrapped paper from the dryer cylinder leads to excessive downtime of the dryer section.
  • GB-A-947 294 and US-A-1 838 603 disclose the use of vacuum sensors in a paper making machine.
  • Vacuum sensors are not as sensitive to dust and dirt as optical transducer type counterparts.
  • the present invention provides a vacuum transducer for detecting a sheet break which is insensitive to operational changes in the normal adjustments in vacuum levels of the vacuum rolls, while reliably detecting a sheet break.
  • Another object of the present invention is the provision of a vacuum sheet break detecting apparatus which overcomes the aforementioned problems of the prior art arrangements and which makes a considerable contribution to the art of detecting a sheet break in a dryer section.
  • the present invention relates to a sheet break detector apparatus and method for detecting a sheet break in a dryer section of a paper machine.
  • the apparatus includes a vacuum transducer which is sensitive to the vacuum level within a vacuum roll of the dryer section.
  • the transducer detects only a sudden change in the vacuum level within the vacuum roll resulting from a sheet break, rather than a relatively gradual change in the vacuum level resulting from an operator augmented vacuum level change.
  • the apparatus also includes means connected to the transducer and responsive to the transducer for redirecting the sheet to a broke chute or pit upstream relative to the transducer when the transducer detects the sudden change in vacuum level.
  • the arrangement is such that excessive wind-up of the broken sheet around a dryer of the dryer section is inhibited.
  • the transducer is a piezoelectric pressure transducer which senses the vacuum level within a center shaft of the vacuum roll.
  • the transducer senses the vacuum level within a duct which connects the vacuum roll to a source of partial vacuum.
  • the transducer is such that during normal operation of the dryer section, when the unbroken sheet extends through the dryer section, a first output from the transducer is zero, and when a sheet break occurs, an output signal is generated which is proportional to the change in vacuum level within the vacuum roll as a result of the sheet break.
  • FIG. 1 is a side-elevational view of a portion of a Bel-Champ TM type dryer section including a sheet break detector apparatus, generally designated 10 according to the present invention, for detecting a sheet break in the dryer section, generally designated 12 .
  • the apparatus 10 includes a vacuum transducer 14 which is sensitive to the vacuum level within a vacuum roll 16 of the dryer section 12 .
  • the transducer 14 detects only a sudden change in the vacuum within the vacuum roll 16 resulting from a sheet break rather than a relatively gradual change in vacuum resulting from an operator augmented vacuum level change.
  • Figure 2 is a view similar to that shown in Figure 1, but showing the operation of the apparatus 10 in the event of a web breakage. More particularly, means 18 are connected to the transducer 14 and responsive to the transducer 14 for redirecting the sheet W to a broke pit 22 disposed upstream relative to the transducer 14 when the transducer 14 detects a sudden change in vacuum level. The arrangement is such that excessive wind-up of the broken web W around a dryer 24 of the dryer section 12 is inhibited.
  • the broken web W is shown as wrapping around dryer cylinder 24 and the trailing end of the downstream broken web passing the vacuum roll 16 in order to extend around drying cylinder 26 .
  • the means 18 may include a transverse web cutting device for cutting the web as it extends around a vacuum transfer roll 28 . Additionally, the means 18 may include an arrangement for cutting off the vacuum to the vacuum roll 28 such that the moving web will fall to the broke pit 22 rather than extending around the vacuum roll 28 for transfer into the downstream dryer group, which includes drying cylinders 24 and 26 and vacuum roll 16 .
  • the present invention is directed particularly to the transducer 14 , which senses the sudden change in vacuum level, and it will be understood by those skilled in the art that such transducer may be used for triggering a visual or audible alarm so that an operator may manually direct the web to the broke pit.
  • the aforementioned transducer 14 may generate a signal for cutting the web upstream of the entire dryer group or, for in any other manner, interrupting the movement of the web along the dryer section.
  • the transducer 14 is a piezoelectric pressure transducer.
  • Figure 3 is a schematic representation showing the transducer 14 for sensing the vacuum level existing within a center shaft 30 of the vacuum roll 16 .
  • FIG 4 is a similar view to that shown in Figure 3, but shows an alternative embodiment of the present invention in which a transducer 14A senses the vacuum level within a duct 32 which connects the vacuum roll 16A to a source of partial vacuum 34 .
  • the transducer 14 is arranged in such a manner that during normal operation of the dryer section 12 , when the unbroken web W extends through the dryer section 12 , the output from the transducer is zero.
  • the change in vacuum is sensed by the transducer and an output signal is generated which is proportional to the change in vacuum level within the vacuum roll 16 as a result of the sheet break.
  • Figure 5 is a graph 36 showing the response of the piezoelectric transducer 14 to a steady state condition with the graph 36 representing the pressure against a number of time constants.
  • Figure 6 shows four graphs 38,40,42 and 44 indicating the transducer output for various time constants in response to a sheet break.
  • Figure 7 shows graphs 46,48 and 50 indicating the response of the transducer 14 to routine damper adjustments of the vacuum roll for various time constants.
  • Figure 7 shows the graphs for the pressure relative to the time of adjustment.
  • the output from the transducer 14 decays to zero when a new steady state condition exists, as shown particularly in the graph 44 shown in Figure 6, following the sheet break.
  • the difference in the output signal between a fast and a relatively slow change makes it possible to detect the difference between a sheet break and damper movement.
  • the time constant is within the range 1 millisecond to 3 seconds.
  • the time constant is defined as the period required for the output to reach e -1 , or .368, of its original value.
  • Figure 5 shows the graph 36 of this curve.
  • the objective is to configure the transducer system such that it has a time constant on the order of milliseconds.
  • the vacuum change occurring during a sheet break happens fast enough to be fully sensed by the transducer, as shown in the graph depicted in Figure 6.
  • the means may include a cross-machine web cutter such that the web is directed to the broke chute 22 .
  • the means may include an audible or visible alarm for directing an operator to the presence of a sheet break.
  • the break detector can be set up to operate without false break signals due to operator adjustment of vacuum levels.
  • the present invention provides a reliable means for detecting a sheet break that is particularly advantageous for detecting a sheet break within a dryer section having no open draws.

Landscapes

  • Paper (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Controlling Sheets Or Webs (AREA)

Claims (9)

  1. Vorrichtung (10) zum Entdecken des Zerreissens einer Papierbahn, um ein Zerreissen der Papierbahn in einer Trockenpartie (12) einer Papiermaschine, die Trockenzylinder (20, 24, 26), Vakuumleitwalzen (16, 18) und einen einzigen Trockenfilz umfasst, zu entdecken, wobei die Vorrichtung dadurch gekennzeichnet ist, dass sie umfasst:
    einen Vakuum-Messwandler (14), um den Pegel des Vakuums innerhalb einer Vakuumwalze (16) der Trockenpartie (12) zu messen, wobei der Messwandler (14) eher nur eine plötzliche Änderung des Vakuumpegels innerhalb der Vakuumwalze (16) entdeckt, die von einem Zerreissen der Papierbahn herrührt, als eine relativ allmähliche Änderung des Vakuumpegels, die von einer Änderung zum Erhöhen des Vakuumpegels durch den Operateur herrührt; und
    eine Einrichtung (18), die mit dem Messwandler (14) verbunden ist und auf den Messwandler (14) reagiert, um die Papierbahn zu einem Sammelkasten (22) für Fertigungsausschuss stromaufwärts bezüglich des Messwandlers (14) umzuleiten, wenn der Messwandler (14) die plötzliche Änderung im Vakuumpegel entdeckt, wobei die Anordnung so ist, dass ein übermässiges Aufwinden der gerissenen Papierbahn (W) um einen Trockner (24) der Trockenpartie (12) herum gehemmt wird.
  2. Vorrichtung (10) zum Entdecken des Zerreissens einer Papierbahn nach Anspruch 1, bei welcher der Messwandler (14) aus einem piezoelektrischen Druckmesswandler besteht.
  3. Vorrichtung (10) zum Entdecken des Zerreissens einer Papierbahn nach Anspruch 2, bei welcher der Messwandler (14) den Vakuumpegel innerhalb einer Zentralwelle (30) der Vakuumwalze (16) misst.
  4. Vorrichtung (10) zum Entdecken des Zerreissens einer Papierbahn nach Anspruch 2, bei welcher der Messwandler (14A) den Vakuumpegel innerhalb einer Röhrenleitung (32) misst, welche die Vakuumwalze (16A) mit einer Quelle (34) von Teilvakuum verbindet.
  5. Vorrichtung (10) zum Entdecken des Zerreissens einer Papierbahn nach Anspruch 2, bei welcher der Messwandler (14) so eingestellt ist, dass während dem normalen Betrieb der Trockenpartie (12), wenn sich die nicht gerissene Papierbahn (W) durch die Trockenpartie (12) erstreckt, ein Ausgang aus dem Messwandler (14) null ist, und dass, wenn ein Zerreissen der Papierbahn stattfindet, ein weiteres Ausgangssignal erzeugt wird, das proportional zur Änderung im Vakuumpegel als Folge des Zerreissens der Papierbahn innerhalb der Vakuumwalze (16) ist.
  6. Vorrichtung (10) zum Entdecken des Zerreissens einer Papierbahn nach Anspruch 5, bei welcher das weitere Ausgangssignal auf null fällt, wenn anschliessend an das Zerreissen der Papierbahn eine neue Bedingung mit stationärem Zustand besteht, wobei das weitere Ausgangssignal nur erzeugt wird, wenn die Änderung im Vakuumpegel innerhalb einer relativ kleinen Zeitkonstanten stattfindet.
  7. Vorrichtung (10) zum Entdecken des Zerreissens einer Papierbahn nach Anspruch 6, bei welcher die Zeitkonstante innerhalb eines Bereichs von 1 Millisekunde bis 3 Sekunden liegt.
  8. Vorrichtung (10) zum Entdecken des Zerreissens einer Papierbahn nach Anspruch 1, bei welcher die Einrichtung (18) umfasst:
    eine quer zur Maschine angeordnete Schneidevorrichtung für die Papierbahn, um die Papierbahn abzuschneiden;
    einen Sammelkasten (22) für Fertigungsausschuss, der unter der Schneidevorrichtung angeordnet ist, um die abgeschnittene Papierbahn aufzusammeln.
  9. Vorrichtung (10) zum Entdecken des Zerreissens einer Papierbahn, um ein Zerreissen der Papierbahn in einer einreihigen Trockenpartie (12) einer Papiermaschine, die Trockenzylinder (20, 24, 26), Vakuumleitwalzen (16, 18) und einen einzigen Trockenfilz umfasst, zu entdecken, wobei die Vorrichtung dadurch gekennzeichnet ist, dass sie umfasst:
    einen Vakuum-Messwandler (14), um den Pegel des Vakuums innerhalb einer Vakuumwalze (16) der Trockenpartie (12) zu messen, wobei der Messwandler (14) eher nur eine plötzliche Änderung des Vakuumpegels innerhalb der Vakuumwalze (16) entdeckt, die von einem Zerreissen der Papierbahn herrührt, als eine relativ allmähliche Änderung des Vakuumpegels, die von einer Änderung zum Erhöhen des Vakuumpegels durch den Operateur herrührt; und
    eine Einrichtung (18), die mit dem Messwandler (14) verbunden ist und auf den Messwandler (14) reagiert, um ein Signal zu erzeugen, das anzeigt, dass ein Zerreissen der Papierbahn stattgefunden hat, wenn der Messwandler (14) die plötzliche Änderung im Vakuumpegel entdeckt, wobei die Anordnung so ist, dass ein übermässiges Aufwinden der gerissenen Papierbahn (W) um einen Trockner (24) der einreihigen Trockenpartie (1.2) herum gehemmt wird.
EP93924356A 1992-11-25 1993-10-19 Vorrichtung zur bruchdetektion einer bahn Expired - Lifetime EP0660898B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US98157992A 1992-11-25 1992-11-25
US981579 1992-11-25
PCT/US1993/009974 WO1994012724A1 (en) 1992-11-25 1993-10-19 A sheet break detector apparatus

Publications (2)

Publication Number Publication Date
EP0660898A1 EP0660898A1 (de) 1995-07-05
EP0660898B1 true EP0660898B1 (de) 1996-09-04

Family

ID=25528481

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93924356A Expired - Lifetime EP0660898B1 (de) 1992-11-25 1993-10-19 Vorrichtung zur bruchdetektion einer bahn

Country Status (13)

Country Link
EP (1) EP0660898B1 (de)
JP (1) JP2562799B2 (de)
KR (1) KR950704569A (de)
CN (1) CN1035076C (de)
BR (1) BR9307486A (de)
CA (1) CA2150021C (de)
DE (2) DE660898T1 (de)
FI (1) FI952548A0 (de)
MX (1) MX9307387A (de)
MY (1) MY110025A (de)
PL (1) PL172455B1 (de)
TW (1) TW229270B (de)
WO (1) WO1994012724A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1640497A2 (de) 2004-09-27 2006-03-29 Voith Paper Patent GmbH Einrichtung und Verfahren zur Überwachung des Überführens einer Materialbahn, insbesondere während der Verbreiterung eines Überführstreifens der Materialbahn, auf einen Abriss der Materialbahn

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI109235B (fi) * 1998-04-27 2002-06-14 Fotocomp Oy Menetelmä paperiradan irtoamiskulman ja/tai -profiilin määrittämiseksi
DE10042243A1 (de) * 2000-08-28 2002-03-14 Voith Paper Patent Gmbh Verfahren zur Bahnrißüberwachung
DE102007000679A1 (de) 2007-11-09 2009-05-14 Voith Patent Gmbh Verfahren und Vorrichtung zum Erfassen eines Risses und/oder eines Elastizitätsmoduls einer Materialbahn
ES2731276T3 (es) * 2016-08-29 2019-11-14 Siemens Ag Procedimiento para el funcionamiento de una máquina para la fabricación y/o el tratamiento de una banda de material
CN107164987B (zh) * 2017-07-14 2019-02-19 河南卷烟工业烟草薄片有限公司 一种大缸损纸及纸屑收集装置
JP6902270B2 (ja) * 2017-10-02 2021-07-14 デュプロ精工株式会社 帯状物形成装置
CN110877839B (zh) * 2018-09-06 2022-03-25 西门子（中国）有限公司 断纸的处理方法及设备
EP3699356A1 (de) * 2019-02-25 2020-08-26 Siemens Aktiengesellschaft Verfahren und vorrichtung zur erkennung eines bahnabrisses einer faserbahn, industrielle anlage sowie computerprogrammprodukt
CN110906972B (zh) * 2019-10-28 2021-06-18 浙江大学山东工业技术研究院 一种纸张监测自动防断系统

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1725108A (en) * 1926-03-10 1929-08-20 Alvin W Smith Method and apparatus for making paper
US1838603A (en) * 1929-07-11 1931-12-29 Sr George S Witham Paper making machine
US3097993A (en) * 1961-05-23 1963-07-16 Dominion Eng Works Ltd Apparatus for automatic knock-off shower for paper machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1640497A2 (de) 2004-09-27 2006-03-29 Voith Paper Patent GmbH Einrichtung und Verfahren zur Überwachung des Überführens einer Materialbahn, insbesondere während der Verbreiterung eines Überführstreifens der Materialbahn, auf einen Abriss der Materialbahn
US7473335B2 (en) 2004-09-27 2009-01-06 Voith Paper Patent Gmbh Apparatus and method for monitoring the transfer of a material web

Also Published As

Publication number Publication date
MY110025A (en) 1997-11-29
WO1994012724A1 (en) 1994-06-09
PL308218A1 (en) 1995-07-24
CA2150021C (en) 1998-09-01
FI952548A (fi) 1995-05-24
CA2150021A1 (en) 1994-06-09
JPH07507604A (ja) 1995-08-24
CN1088647A (zh) 1994-06-29
KR950704569A (ko) 1995-11-20
EP0660898A1 (de) 1995-07-05
MX9307387A (es) 1994-06-30
TW229270B (de) 1994-09-01
DE69304545T2 (de) 1997-02-06
BR9307486A (pt) 1999-08-24
JP2562799B2 (ja) 1996-12-11
FI952548A0 (fi) 1995-05-24
DE69304545D1 (de) 1996-10-10
CN1035076C (zh) 1997-06-04
PL172455B1 (pl) 1997-09-30
DE660898T1 (de) 1996-01-18

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