EP0848105A2 - Procédé et appareil pour mesurer des distances dans la zone de la caisse de tête d'une machine à papier - Google Patents

Procédé et appareil pour mesurer des distances dans la zone de la caisse de tête d'une machine à papier Download PDF

Info

Publication number: EP0848105A2
Authority: EP; European Patent Office
Prior art keywords: magnetic field; measuring device; headbox; lip; lips
Prior art date: 1996-11-13
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

EP97119141A

Other languages

German (de)

English (en)

Other versions

EP0848105A3 (fr

EP0848105B1 (fr

Inventor

Walter Dipl.-Ing. Cadek

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.)

Andritz AG

Original Assignee

Andritz Patentverwaltungs GmbH

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.)

1996-11-13

Filing date

1997-11-03

Publication date

1998-06-17

1997-11-03 Application filed by Andritz Patentverwaltungs GmbH filed Critical Andritz Patentverwaltungs GmbH

1998-06-17 Publication of EP0848105A2 publication Critical patent/EP0848105A2/fr

1999-01-13 Publication of EP0848105A3 publication Critical patent/EP0848105A3/fr

2002-09-25 Application granted granted Critical

2002-09-25 Publication of EP0848105B1 publication Critical patent/EP0848105B1/fr

2017-11-03 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/02—Head boxes of Fourdrinier machines
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/02—Head boxes of Fourdrinier machines
- D21F1/028—Details of the nozzle section

Definitions

the invention relates to a method and a device for measuring Clearances in the area of the headbox of a paper machine.
the aim of the invention is therefore to provide a measurement method that the Measures the outlet gap directly with the best accuracy.
the invention is therefore characterized in that magnetic Constant fields are generated in the area of the headbox outlet gap, their thickness measured and from this the distance between the individual lips is determined. This enables the consistencies in the constant part of the paper machine be precisely determined, which creates the conditions for the exact control of a multi-layer headbox (top layer, Intermediate layer, back layer) is given. The amount of substance of each Layers can be set precisely in the area of the headbox will.
An advantageous development of the invention is characterized in that that the magnetic field is generated by a permanent magnet.
Conventional inductive distance sensors or eddy current sensors cannot penetrate the stainless steel walls.
a favorable embodiment of the invention is characterized in that that the measurement of the magnetic field is carried out by a Hall generator. These are due to the small mechanical dimensions especially suitable for installation in thin lips.
a favorable further development of the invention is characterized in that that a linearization of the measurement result by subsequent connection on Signal output of the magnetic field sensor from nonlinear elements with non-linear characteristic is reversed to the magnetic field characteristic. As a result, no linearization of the magnetic field is necessary.
An advantageous embodiment of the invention is characterized in that that nonlinear signals from a transducer into a via a data table linear signal can be converted.
This data table can be special simply be adapted to the respective magnetic field characteristics. Also possible non-linearities of the Hall generator or the signal processing can be taken into account in this way.
An alternative embodiment of the invention is characterized in that that nonlinear signals from a transducer into a via a data table targeted non-linear signal can be converted. That has e.g. the advantage, that small distances can be detected with greater accuracy, larger distances with less accuracy.
the relative accuracy (Resolution / current signal level) could e.g. B. over the entire measuring range be kept constant.
the invention also relates to a measuring device for determining distances in the area of the headbox of a paper machine. she is characterized in that in one of the two, the distance determining elements a magnetic field generator for a magnetic Same field and on the second of the two, determining the distance Elements a magnetic field meter is provided. Such Measuring device can be particularly easily in the thin lips of a Headbox are housed.
a favorable further development of the invention is characterized in that that a permanent magnet is provided as the magnetic field source, wherein alternatively, a current coil can also be provided.
the permanent magnet needs no electrical supply voltage, needed therefore no cable connection to the other parts of the measuring arrangement.
a current coil can be a particularly strong one and also at extreme temperature fluctuations generate a constant magnetic field.
An advantageous embodiment of the invention is characterized in that that a Hall generator is provided as a magnetic field measuring device. This is due to its small mechanical dimensions, it is particularly easy to To house the lips of the headbox.
An advantageous development of the invention is characterized in that that in a two-layer headbox with a central lip, the magnetic field source, especially the permanent magnet, in the middle lip and in everyone outer lip (upper and lower lip) provided a magnetic field meter are.
the gap between the upper lip can also be particularly good and middle lip and between the middle lip and lower lip will.
a particularly favorable development of the invention is characterized in that in a multi-layer headbox with several Intermediate lips the magnetic field sources, especially the permanent magnets, are staggered in the intermediate lips and in each outer lip (upper and lower lip) for each magnetic field Pair of magnetic field meters is provided. With this move The position of the individual intermediate lips can be arranged determine exactly between the upper and lower lip and thus also the Gap between the intermediate lips from the differences in the distances to calculate. So all are for the determination of the individual material flows Column recorded.
An advantageous embodiment of the invention is characterized in that that the magnets are designed such that they have a linear magnetic field produce.
the signal from the magnetic field detectors can then without further processing can be used as a measurement signal.
a favorable further development of the invention is characterized in that that magnetic field meters are connected to a microprocessor.
the signals from the transducer can thus be particularly cheap into the linear or non-linear ones required for further processing Convert signals.
Fig. 1 shows a section through a two-layer headbox Tissue paper machine
Fig. 2 the lips with the built-in measuring devices in detail
Fig. 3 the installation situation with a three-layer Headbox
Fig. 4 is an axionometric view of Fig. 3.
the paper web is here formed between two rollers 2, 3 are covered with sieves 4, 4 '. Between them around the rollers 2, 3 running sieves 4, 4 'there is a gap 5 into which the headbox 1 is injected via feed lines 6, 6 'injected suspension.
the speed of the sieve belts 4, 4 'and thus the required The speed of the suspension injected into the gap 5 can up to about 2000 m / min. be.
the area of the suspension exit into the gap 5 between the sieves 4, 4 'on the rollers 2, 3 is shown in detail in Fig. 2.
the magnetic field transmitter 10 is installed in the intermediate lip 11.
the Magnetic field of the transmitter 10 has a position-dependent intensity.
the signal of the magnetic field receiver 9 corresponds to the received one Magnetic field and is therefore also from the position, in particular from the Distance to the magnetic field transmitter 10 depends. So it can Signal of the magnetic field receiver 9 as a measure of the distance of the Intermediate lip 11 to the upper lip 7 or lower lip 8 can be used. In usually exists between the distance from the transmitter 10 to Receiver 9 no linear relationship, but there is a clear one Relationship in the form that a particular signal a certain magnetic field strength and thus corresponds to a certain distance.
This linearization produces e.g. via a data table a value for the from the respective magnetic field receiver signal actual distance.
the output can be on a display, or also as a standardized current signal e.g. 4 ... 20 milliamps.
the current signal is particularly suitable for further processing of the signal in one Process control system.
Fig. 3 is the view from the screen section on the lips of a three-layer headbox.
two measuring arrangements 14, 14 ' are sufficient offset far to the side so that there is no mutual interference more exists.
the left measuring arrangement 14 measures the position of the lower intermediate lip 13, the right measuring arrangement 14 'the position of the upper intermediate lip 12. From these signals can by difference also the distance between the two intermediate lips 12, 13 be determined.
the measuring arrangements 14, 14 ' are analogous to the measuring arrangement built in a two-layer headbox and consist of two magnetic field receivers 9 and one transmitter 10 each.
Fig. 4 shows a perspective view of the lips 7, 8, 12, 13 and built-in measuring arrangements 14, 14 'for a three-layer headbox.

Landscapes

Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Measuring Magnetic Variables (AREA)
Controlling Sheets Or Webs (AREA)

EP97119141A 1996-11-13 1997-11-03 Appareil pour mesurer des distances dans la zone de la caisse de tête d'une machine à papier Expired - Lifetime EP0848105B1 (fr)

Applications Claiming Priority (3)

Application Number	Priority Date	Filing Date	Title
AT198596		1996-11-13
AT0198596A AT404848B (de)	1996-11-13	1996-11-13	Verfahren und einrichtung zur messung von abständen im bereich des stoffauflaufes einer papiermaschine
AT1985/96		1996-11-13

Publications (3)

Publication Number	Publication Date
EP0848105A2 true EP0848105A2 (fr)	1998-06-17
EP0848105A3 EP0848105A3 (fr)	1999-01-13
EP0848105B1 EP0848105B1 (fr)	2002-09-25

Family

ID=3525356

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP97119141A Expired - Lifetime EP0848105B1 (fr)	1996-11-13	1997-11-03	Appareil pour mesurer des distances dans la zone de la caisse de tête d'une machine à papier

Country Status (9)

Country	Link
US (1)	US6221213B1 (fr)
EP (1)	EP0848105B1 (fr)
CN (1)	CN1145012C (fr)
AT (1)	AT404848B (fr)
CA (1)	CA2220838A1 (fr)
DE (1)	DE59708318D1 (fr)
ES (1)	ES2184018T3 (fr)
ID (1)	ID19703A (fr)
ZA (1)	ZA9710179B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US8333631B2 (en) *	2009-02-19	2012-12-18	Cree, Inc.	Methods for combining light emitting devices in a package and packages including combined light emitting devices
CN109520408B (zh) *	2019-01-09	2020-10-27	谭斌	钢筋间距检测设备及钢筋间距测量方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US3828248A (en) *	1971-01-14	1974-08-06	G Wennerberg	Apparatus for measuring a predetermined characteristic of moving sheet material which accommodates both tilting and changes in thickness and vertical location of the material
DE2409521C3 (de) *	1974-02-28	1979-04-26	J.M. Voith Gmbh, 7920 Heidenheim	Stoff auflauf für Papiermaschinen
DE3107926A1 (de) *	1981-03-02	1982-11-04	Escher Wyss Gmbh, 7980 Ravensburg	Verfahren zum ausbilden einer mehrlagigen papierbahn in einem doppelsiebformer und doppelsiebformer zur durchfuehrung des verfahrens
CA1157304A (fr) *	1981-09-28	1983-11-22	Consolidated-Bathurst Inc.	Methode et dispositif de controle d'un produit affecte par le dosage
SE428809B (sv) *	1981-12-01	1983-07-25	Karlstad Mekaniska Ab	Sett och anordning for att under drift av en inloppslada eller liknande meldavgivande don for en pappersmaskin erhalla information om storleken av en meltutloppsspalt
US4791367A (en) *	1987-07-15	1988-12-13	Impact Systems, Inc.	Contacting thickness gauge for moving sheet material
US4929895A (en) *	1989-03-22	1990-05-29	Impact Systems, Inc.	Thickness gauge for moving sheet material with inner and outer flexibly mounted bearings
FI92437C (fi) *	1992-06-09	1994-11-10	Tampella Oy Valmet	Magneettinen mittausmenetelmä raon suuruuden ja muodon (profiilin) määräämiseksi

1996
- 1996-11-13 AT AT0198596A patent/AT404848B/de not_active IP Right Cessation
1997
- 1997-11-03 DE DE59708318T patent/DE59708318D1/de not_active Expired - Fee Related
- 1997-11-03 EP EP97119141A patent/EP0848105B1/fr not_active Expired - Lifetime
- 1997-11-03 ES ES97119141T patent/ES2184018T3/es not_active Expired - Lifetime
- 1997-11-06 ID IDP973620A patent/ID19703A/id unknown
- 1997-11-12 ZA ZA9710179A patent/ZA9710179B/xx unknown
- 1997-11-12 CA CA002220838A patent/CA2220838A1/fr not_active Abandoned
- 1997-11-13 CN CNB971141584A patent/CN1145012C/zh not_active Expired - Fee Related
- 1997-11-13 US US08/969,691 patent/US6221213B1/en not_active Expired - Fee Related

Also Published As

Publication number	Publication date
AT404848B (de)	1999-03-25
ID19703A (id)	1998-07-30
CN1145012C (zh)	2004-04-07
EP0848105A3 (fr)	1999-01-13
CN1183545A (zh)	1998-06-03
CA2220838A1 (fr)	1998-05-13
ES2184018T3 (es)	2003-04-01
DE59708318D1 (de)	2002-10-31
US6221213B1 (en)	2001-04-24
EP0848105B1 (fr)	2002-09-25
ATA198596A (de)	1998-07-15
ZA9710179B (en)	1998-05-28

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