EP0966567B1 - Einrichtung in einer messstation - Google Patents

Einrichtung in einer messstation Download PDF

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Publication number
EP0966567B1
EP0966567B1 EP98909891A EP98909891A EP0966567B1 EP 0966567 B1 EP0966567 B1 EP 0966567B1 EP 98909891 A EP98909891 A EP 98909891A EP 98909891 A EP98909891 A EP 98909891A EP 0966567 B1 EP0966567 B1 EP 0966567B1
Authority
EP
European Patent Office
Prior art keywords
web
measuring
support strip
machine
heads
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
EP98909891A
Other languages
English (en)
French (fr)
Other versions
EP0966567A1 (de
Inventor
Lars-Magnus Hultcrantz
Svanqvist Olof Sixten Tord
Örtemo Bo Herbert LENNART
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 AB
Original Assignee
Metso Paper Karlstad AB
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 Karlstad AB filed Critical Metso Paper Karlstad AB
Publication of EP0966567A1 publication Critical patent/EP0966567A1/de
Application granted granted Critical
Publication of EP0966567B1 publication Critical patent/EP0966567B1/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
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0063—Devices for threading a web tail through a paper-making machine
    • 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

Definitions

  • the present invention relates to a paper or cardboard machine for manufacturing a paper or cardboard web
  • a measuring station said measuring station being situated between two work stations in said machine and comprising a scanner with two measuring heads travelling to and fro across the web and between them defining a space through which the web passes, driven by drive members.
  • the performance of a paper machine is often limited by its drying section.
  • Several factors in the drying section may cause a rupture in the web and the web produced may then have to be rejected due to unsatisfactory quality.
  • the main factors affecting the efficiency of the machine's drying section are loss of time when there is no paper on the reeling drum and the quantity of paper that must be rejected after a rupture.
  • the paper reel is ejected in the event of a rupture since it is difficult to rewrap a half-sized reel to continue reeling, and if it is too small the reel is rejected.
  • flutter suppressers In order to reduce web breakage it is known to stabilize or support the web by means of flutter suppressers along its draw.
  • flutter suppressers may be in the form of plates or wings extending across the width of the predetermined web draw.
  • Web stabilizers or flutter suppressing wings are described in US-A-4,321,107 (Page) and US-A-3,650,043 (Overly et al.). A section of the web draw where the web is supported is termed closed draw.
  • the web In the drying section of a paper machine the web usually passes a measuring station with a scanner for measuring properties such as moisture and basis weight. Scanners are described for instance in US-A-5,164,048 (Bossen et al.) and US-A-5,233,195 (Hellstrom et al.).
  • US-A-4,321,107 states that a tissue-paper web runs from a Yankee-cylinder past a suppressing wing, through a scanner and then past a second suppressing wing. According to this patent specification the scanner forms an intermediate element between the suppressing wings. The part of the web draw where scanning occurs will therefore constitute an open draw.
  • a scanner is to be applied on a part of the web draw, scanning may not of course be impeded by any object such as a suppressing wing.
  • the part of the web draw where the web passes a scanner will, however, have a greater tendency to web flutter and web rupture than the parts of the web draw where the web can be supported by a suppressing wing or similar element.
  • the distance the web travels during passage of the measuring frame of the measuring station is of course relatively short, but it is still sufficiently long to be able to cause undesired flutter.
  • Another drawback with the web flutter caused by the open draw is that measurement of the web properties will be less accurate.
  • the object of the present invention is to reduce the occurrence of web rupture caused by web flutter when the web passes a measuring station that includes a scanner having two movable measuring heads. Another object is to increase the accuracy of the scanning function.
  • the machine according to the present invention is characterized in that the measuring station comprises a continuous, flexible support strip extending through said space between the measuring heads, transverse and parallel to the web from one edge to the other, and drive members for winding and unwinding the support strip onto or off rolls arranged at points outside each edge of the web, for displacement of the support strip transversely to the web in the same direction and at the same speed as the measuring heads, and in that the support strip is provided with at least one through-opening to expose the web to at least one measuring transducer, the emitter unit and receiver unit of which are situated in individual measuring heads or the same measuring head.
  • Figure 1 is a side view of a part of a paper machine showing a measuring station placed between two work stations for a continuous paper web.
  • Figure 2 is a side view showing a part of the web draw upstream of the measuring station, in greater detail.
  • Figure 3 shows the measuring station according to Figure 1 seen in the direction of the machine.
  • Figure 4 is a top view of the web and a part of the scanner along the arrows A-A in Figure 3.
  • Figure 5 shows the measuring station according to Figure 1 with the measuring heads of the scanner near an end position.
  • Figure 6 is a top view of the web and of a part of the scanner along the arrows B-B in Figure 5.
  • Figure 1 shows a measuring station 1 receiving a continuous paper web 2 with two longitudinal edges 20, 21.
  • the web is delivered from a previous work station 3 such as a pair of calender rolls, and runs in a predetermined path of movement through the measuring station 1 where measuring is performed. From the measuring station 1 the web continues to the next work station 4, such as a reel-up.
  • the paper web is delivered to the measuring station 1 via a support member 5 forming a web-supporting or web-carrying surface.
  • the support member 5 comprises a plurality of plates 6 arranged one after the other which extend across the width of the web, and tubes 7, also extending across the width of web. The plates 6 are mounted close to the predetermined path of movement of the web.
  • the tubes 7 are placed as connecting elements between two consecutive plates 6, and each tube 7 extends in vertical direction slightly past the plane of the plate situated downstream.
  • the transition between the tube 7 and the plate 6 located downstream will create a zone with partial pressure which will draw the web 2 towards the plate, thus improving, adhesion between the web and the surface supporting the web.
  • the tubes 7 are connected to a compressed air source and are provided with oblong slits or openings (not shown) facing the direction of movement of the web 2.
  • the measuring station 1 comprises a stand which, in the embodiment shown, comprises two vertical side beams 9 and 10 joined together by means of a horizontal top beam 11 and a horizontal bottom beam 12. These beams thus form a rectangular open frame and the web 2 passes through the opening 13 therein.
  • the measuring station 1 comprises a scanner having two cooperating measuring heads 14, 15 disposed vertically one above the other at a predetermined distance from each other so that a space is formed between their flat horizontal surfaces facing each other, through which space the web 2 runs a short distance from said flat surfaces of the measuring heads.
  • the measuring heads 14, 15 are provided with one or more measuring transducers in order to measure various properties of the paper web 2, such as sheet thickness, moisture content, basis weight, etc.
  • the measuring station 1 also comprises two cantilevers 16, 17, each supporting a measuring head 14, 15, respectively, and being movably journalled in the top beam 11 and bottom beam 12, respectively, along a horizontal rail (not shown).
  • the measuring station 1 also comprises drive means for moving the carriages 18, 19 carrying the measuring heads 14, 15.
  • the drive means comprise a common drive source 22 for the two carriages 18, 19, said drive source 22 consisting of a motor journalled on one side beam 9.
  • the drive means comprise a transmission with vertical, rotatably journalled driving rod 23, driven by the motor 22 via a coupling 24, and upper and lower endless driving belts 25, 26 running in the top beam 11 and bottom beam 12, respectively and round wheels 27 journalled in the side beams 9, 10.
  • the vertical driving rod 23 is joined at its upper and lower ends to the wheels 27 so that the rotary movement of the driving rod 23 is transmitted to the wheels 27 to drive the belts 25, 26 at exactly the same speed.
  • the cantilevers 16, 17 are firmly secured to the driving belts 25, 26 so that the measuring heads 14, 15 will be moved synchronously with each other, transversely to and fro across the web 2 as the motor 22 changes driving direction.
  • the measuring heads have two measuring transducers and each measuring transducer comprises an emitter unit 42 situated in the upper measuring head and a receiver unit 43 situated in the lower measuring head, these two units always being vertically aligned with each other thanks to the synchronous movement of the measuring heads 14, 15.
  • the measured values obtained are processed by means of known technology not dealt with here.
  • the invention relates to a device in a measuring station 1 of the type described above, for instance, said device comprising a continuous, flexible support strip 28 extending through the space between the measuring heads in a direction transverse to the web 2 and so that the support strip 28 is situated immediately above and parallel with the web 2.
  • a roll 29, 30 is rotatably arranged in the vicinity of each side beam 9, 10.
  • the ends of the support strip 28 are attached to the two rolls 29, 30 for alternate winding onto and unwinding from the rolls 29, 30 with the aid of drives means 40, 41 so that the support strip 28 acquires the same direction of movement and exactly the same speed as the measuring heads 14, 15.
  • the drive means for the support strip 28 are separate from the drive means for the measuring heads 14, 15 but the two systems are synchronized so that the support strip 28 and the measuring heads 14, 15 are driven at exactly the same speed, the relative speed between them thus being zero.
  • the parallel extension of the support strip 28 with and across the web is assured by two deflection rollers 31, 32 around which the support strip 28 passes during its movement up and down from the winding and unwinding rolls 29, 30.
  • the deflection rollers 31, 32 are situated in a common plane and are vertically below the winding and unwinding rolls 29, 30. It will be understood that the distance between the deflection rollers 31, 32 is slightly greater than the width of the web 2 to allow sufficient space for the carriages 18, 19 in their end positions when the measuring transducers are situated outside the edges 20, 21 of the web 2.
  • the device suitably includes a control circuit for controlling the tension in the support strip 28 to ensure that the support strip 28 has the desired straight draw, parallel with the web 2.
  • the control circuit has a regulator 44 and a measuring transducer, suitably comprising a load cell 45 which detects the tension in the support strip 28.
  • the tension (measured value) in the support strip 28 measured by the load cell is compared in the regulator 44 with a set value, i.e. a predetermined value for the tension which represents said desired straight draw of the support strip 28.
  • the load cell may be arranged at the deflection roller 32 close to the side beam 10 on the right side of the figures.
  • the load cell senses a force F corresponding to the tension appearing in the support strip at the time of measuring. When the force F decreases, for instance, the load cell emits a signal to the regulator which, after comparison with the set value, emits a signal to the relevant drive means 40 or 41 to retard the roller 29 or 30 from which the support strip is being unwound.
  • Said drive means may advantageously comprise servomotors with braking function.
  • one roller may be driven by a servomotor and the other by a suitable spring which is placed under tension when the support strip is driven in one direction of the servomotor, whereupon the spring force thus built up is responsible for pulling the support strip back in the other direction.
  • the support strip 28 is provided with one or more openings 33 within the section situated in the space between the measuring heads 14, 15. Each opening 33 is aligned with at least one measuring transducer 42, 43 of the measuring heads.
  • the measuring heads 14, 15 include two measuring transducers, as mentioned above, and the support strip 28 is provided with a circular opening 33 for each measuring transducer.
  • the openings 33 are arranged to expose the web 2 to the measuring transducers so that their function is in no way disturbed.
  • the dimension of each opening 33 is as small as possible in order to minimize any collection of dust on the measuring heads, but sufficiently large to permit free passage of measuring signals from the measuring transducers.
  • the lower measuring head 15 comprises a plate 34 which is extended in both directions of movement of the support strip in order to form two downwardly directed parts 35, ensuring that the web 2 is correctly guided to the upper side of the plate 34 (said upper side corresponding to said surface of the lower measuring head 15 which defines the space between the measuring heads).
  • the measuring heads 14, 15 are suitably pivotably mounted on their cantilevers 16, 17 so that their facing surfaces can be given an inclination in relation to the horizontal plane which corresponds to the inclined draw of the web when it passes the measuring station 1.
  • the winding and unwinding rolls 29, 30 and deflection rollers 31, 32 are suitably journalled in a house (not shown) which is pivotably journalled on the inner side of the side beams 9 and 10, respectively, about a horizontal shaft, so that the houses and thus also the support strip 28 can be given the same inclination as the measuring heads 14, 15, the support strip 28 thus being aligned parallel to the web.
  • the distance covered by the measuring heads 14, 15 is sufficient to allow scanning of the whole width of the web 2 before the measuring heads stop at the end positions and then returns in the opposite direction.
  • the measuring station 1 includes two limit switches 36 which sense the position of the upper measuring head 14 and emit a signal to the motor 22 to stop and reverse its drive direction.
  • the measuring station includes two limit switches 37 which sense suitable marks 38, e.g. metal tabs arranged at predetermined points on the support strip 28, whereupon a signal is emitted to the drive means in question to stop the support strip 28 simultaneously with the measuring heads and in the desired end position so that the openings in the support strip are still aligned with the measuring transducers of the measuring heads.
  • a first pulse emitter may be arranged, for instance, at the upper wheel 27 near the side beam 9 on the left side in the drawings, and a second pulse emitter at the left deflection roller 31, these pulse emitters comparing pulses with each other and effecting correction of the speeds of the measuring heads and support strip should they have been recorded as different through deviation of the two pulse measurements.
  • the width of the support strip 28 is suitably somewhat greater than the distance between the stationary support members 5, 8 arranged upstream and downstream, so that the support strip is in sliding contact with the nearest plates 6 thereof, whereupon the support strip 28 overlaps these from above (see Figure 2) and from below, at its edges situated upstream and downstream, respectively.
  • the web 2 will be supported and carried by the support strip 28 and possibly further stabilized by an air flow supplied from the tube 7 immediately upstream of the measuring heads 14, 15, said air flow passing between the support strip 28 and the web 2.
  • the entire path of movement of the web 2 through the measuring station 1 thus forms an unbroken closed draw and yet the measuring transducers on the measuring heads will not be impeded by any object between them and the moving paper web.
  • the invention thus comprises arranging an unbroken closed draw for a moving fibre web 2 through a measuring station 1 by means of a support strip 28 forming a web-supporting and web-carrying surface which will support and carry the fibre web and yet not impede the measuring transducers of the measuring heads.
  • the device according to the invention reduces the occurrence of web ruptures and improves accuracy in scanning or measuring.

Landscapes

  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Replacement Of Web Rolls (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Vehicle Body Suspensions (AREA)

Claims (7)

  1. Papiermaschine oder Pappmaschine zum Herstellen einer Papierbahn oder Pappbahn (2) mit einer Messstation (1), wobei die Messstation sich zwischen zwei Arbeitsstationen (3, 4) in der Maschine befindet und eine Abtasteinrichtung mit zwei Messköpfen (14, 15) aufweist, die sich über der Bahn (2) hin und her bewegen, und wobei zwischen ihnen ein Raum definiert ist, durch den die Bahn (2) angetrieben durch Antriebselemente (22 bis 27) tritt,
    dadurch gekennzeichnet, dass
       die Messstation (1) folgendes aufweist: einen kontinuierlichen flexiblen Stützstreifen (28), der sich durch den Raum zwischen den Messköpfen (14, 15) quer und parallel zu der Bahn (2) von einem Rand (20) zu dem anderen (21) erstreckt, und Antriebselemente (40, 41) für ein Aufwickeln und Abwickeln des Stützstreifens (28) auf oder von Rollen (29, 30), die an Stellen außerhalb von jedem Rand (20, 21) der Bahn angeordnet sind, um den Stützstreifen (28) quer zu der Bahn (2) in der gleichen Richtung und bei der gleichen Geschwindigkeit wie die Messköpfe (14, 15) zu verschieben, und
       der Stützstreifen (28) mit zumindest einer Durchgangsöffnung (33) versehen ist, so dass die Bahn (2) zu zumindest einem Messwandler freigelegt ist, wobei sich dessen Emittereinheit (42) und Recievereinheit (43) an einzelnen Messköpfen oder an dem gleichen Messkopf (14, 15) befinden.
  2. Maschine gemäß Anspruch 1,
    dadurch gekennzeichnet, dass
       die Antriebselemente (40, 41) für die Aufwickelrolle und die Abwickelrolle (29, 30) Servomotoren mit einer Bremsfunktion aufweisen.
  3. Maschine gemäß Anspruch 1 oder 2,
    dadurch gekennzeichnet, dass
       eine Ablenkrolle (31, 32) an jeder Seite der Bahn (2) angeordnet ist, wobei die Achsen der Ablenkrollen (31, 32) an der gleichen Ebene angeordnet sind, wobei die Ebene oberhalb der Bahn (2) so angeordnet ist, dass der Stützstreifen (28) um die Ablenkrollen (31, 32) läuft und sich in einer geraden Bewegungsbahn zwischen diesen unmittelbar oberhalb der Bahn (2) erstreckt.
  4. Maschine gemäß Anspruch 3,
    dadurch gekennzeichnet, dass
       sie eine Steuerschaltung hat, um die Spannung in dem Stützstreifen (28) zu steuern, um sicherzustellen, dass der Stützstreifen (28) zwischen den Ablenkrollen (31, 32) gerade und straff ist, wobei die Steuerschaltung eine Lastzelle (45) aufweist, die an einer (32) der Ablenkrollen angeordnet ist, um die Spannung in dem Stützstreifen (28) zu messen, wobei die Steuerschaltung so eingerichtet ist, dass sie eines der Antriebselemente (40, 41) in dem Falle eines Abweichens der Spannung von einem vorbestimmten Wert, der der Dehnung entspricht, beeinflusst, wodurch die Drehzahl der relevanten Rolle d.h. der Aufwickelrolle oder der Abwickelrolle (29 oder 30) geändert wird.
  5. Maschine gemäß einem der Ansprüche 1 bis 4,
    dadurch gekennzeichnet, dass
       der Stützstreifen (28) mit einer Öffnung (33) für jeden Messwandler versehen ist und
       das Mass der Öffnung so gering wie möglich ist, jedoch ausreichend groß ist, um ein freies Hindurchtreten der Messsignale von den Messwandlern zu ermöglichen.
  6. Maschine gemäß einem der Ansprüche 1 bis 5,
    dadurch gekennzeichnet, dass
       eine Platte (34) an der oberen Seite des unteren Messkopfes angeordnet ist und sich von diesem in beiden Bewegungsrichtungen des Stützstreifens (28) erstreckt, um zwei nach unten gerichtete Abschnitte (35) auszubilden, um sicherzustellen, dass die Bahn (2) korrekt geführt wird, wenn die Messköpfe sich zu der Bahn (2) bewegen.
  7. Maschine gemäß einem der Ansprüche 1 bis 6,
    dadurch gekennzeichnet, dass
       die Breite von dem Stützstreifen (28) etwas größer als der Abstand zwischen den ortsfesten Stützplatten (6) für die Bahn (2) ist, die stromaufwärtig und stromabwärtig von der Messstation angeordnet sind, und
       der Stützstreifen (28) Randabschnitte von benachbarten Stützplatten (6) überdeckt und in einem Gleitkontakt mit diesen steht.
EP98909891A 1997-03-11 1998-02-24 Einrichtung in einer messstation Expired - Lifetime EP0966567B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9700861 1997-03-11
SE9700861A SE508873C2 (sv) 1997-03-11 1997-03-11 Anordning vid mätstation
PCT/SE1998/000322 WO1998040556A1 (en) 1997-03-11 1998-02-24 A device in a measuring station

Publications (2)

Publication Number Publication Date
EP0966567A1 EP0966567A1 (de) 1999-12-29
EP0966567B1 true EP0966567B1 (de) 2002-06-19

Family

ID=20406098

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98909891A Expired - Lifetime EP0966567B1 (de) 1997-03-11 1998-02-24 Einrichtung in einer messstation

Country Status (6)

Country Link
EP (1) EP0966567B1 (de)
AT (1) ATE219538T1 (de)
CA (1) CA2285204A1 (de)
DE (1) DE69806129D1 (de)
SE (1) SE508873C2 (de)
WO (1) WO1998040556A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9416492B1 (en) * 2015-01-28 2016-08-16 Honeywell Limited System and method for adjusting measurement position of scanning head

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE504708C2 (sv) * 1995-09-13 1997-04-07 Valmet Karlstad Ab Sätt och anordning för överföring av en snabbt löpande färdigtorkad fiberbana, särskilt en tissuebana, från en anordning och längs en förutbestämd bana till en efterföljande anordning

Also Published As

Publication number Publication date
SE508873C2 (sv) 1998-11-09
CA2285204A1 (en) 1998-09-17
WO1998040556A1 (en) 1998-09-17
SE9700861D0 (sv) 1997-03-11
SE9700861L (sv) 1998-09-12
EP0966567A1 (de) 1999-12-29
DE69806129D1 (de) 2002-07-25
WO1998040556A8 (en) 2000-04-06
ATE219538T1 (de) 2002-07-15

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