EP0224461A2 - Procédé et châssis dans une section de presse d'une machine à papier pour faciliter le remplacement des rouleaux et des feutres - Google Patents

Procédé et châssis dans une section de presse d'une machine à papier pour faciliter le remplacement des rouleaux et des feutres Download PDF

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Publication number
EP0224461A2
EP0224461A2 EP86850405A EP86850405A EP0224461A2 EP 0224461 A2 EP0224461 A2 EP 0224461A2 EP 86850405 A EP86850405 A EP 86850405A EP 86850405 A EP86850405 A EP 86850405A EP 0224461 A2 EP0224461 A2 EP 0224461A2
Authority
EP
European Patent Office
Prior art keywords
press
frame
roll
intermediate frame
combination
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
EP86850405A
Other languages
German (de)
English (en)
Other versions
EP0224461A3 (en
EP0224461B1 (fr
Inventor
Markku Autio
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
Valmet Paper Machinery Inc
Valmet 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
Priority claimed from DE3541943A external-priority patent/DE3541943C2/de
Priority claimed from FI854959A external-priority patent/FI73025C/fi
Application filed by Valmet Paper Machinery Inc, Valmet Oy filed Critical Valmet Paper Machinery Inc
Priority to AT86850405T priority Critical patent/ATE61430T1/de
Publication of EP0224461A2 publication Critical patent/EP0224461A2/fr
Publication of EP0224461A3 publication Critical patent/EP0224461A3/en
Application granted granted Critical
Publication of EP0224461B1 publication Critical patent/EP0224461B1/fr
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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof
    • 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
    • D21F7/001—Wire-changing arrangements

Definitions

  • the present invention relates to a method in a compact press section of a paper machine which includes a compact press roll combi­nation, the rolls of which form at least two press nips with each other through which a paper web runs, by which method the fabrics in the press section and/or the press rolls of the compact press roll combination can be easily replaced.
  • the method is applied in a frame construction for the press section which includes, in the direction of the run of the paper web, a front frame situated before the roll combination and a rear frame situated after the roll combination, in which method the space above the roll combination and between the front frame and rear frame is opened by pivoting an intermediate frame arrangement into an open position to form an open space which can be used either directly or indirectly to facilitate replacement of at least the pick-up fabric, or equivalent, and of the upper fabric, if any, of the press and/or the replacement of one or more press rolls of the roll combination.
  • the invention also relates to a frame construction in a compact paper machine press section suitable for use in the practice of the method.
  • the frame construction is for a press section which includes a compact press roll combination whose press rolls form at least two and preferably three or more press nips with each other, the paper web running between the press nips, preferably as a closed draw.
  • the press section comprises, in the direction of web run, a front frame situated before the compact press roll combination, and a rear frame separate from the front frame, the front and rear frames being connected to each other by means of an intermediate frame arrangement located above the roll combination which is pivotable into an open position by means of actuating means so that a space is opened above the press roll combination which can be utilized when the press rolls, and prefereably also the press fabrics, are being replaced.
  • front and rear frames are provided before and after the compact press roll combi­nation which are permanently connected to each other by horizontal beams located at both the operating and service sides of the paper machine.
  • front frame means the frame part that is situated before the compact press roll combination in the direction of web run through the press section and on which the upper press roll, conventionally a suction roll, of the first press nip is usually mounted.
  • rear frame means the frame part which is situated after the press roll combination.
  • Beloit Corporation of Beloit, Wisconsin has suggested a frame con­struction, designated as its "flip-top" construction, wherein either the top part of the front frame or the top part of the rear frame can be opened by rotating it about a pivot shaft whose axis is parallel to the transverse direction of the paper machine and which is situ­ated above the press rolls.
  • a pivot shaft whose axis is parallel to the transverse direction of the paper machine and which is situ­ated above the press rolls.
  • the top part of the front frame is opened.
  • the top part of the rear frame must be locked since the top part of the front frame, when opened, is supported on the top part of the rear frame.
  • the top part of the rear frame can be opened, such as in connection with the replacement of the press fabric in the third press nip, only when the top part of the front frame is closed and locked in position.
  • the lower fabric of the first nip which runs mainly in the basement space, is re­placed by means of conventional arrangements.
  • the "flip-top" frame construction described above can be characterized as a type of "drawbridge” which is openable at an articulated joint which is situated in the middle of the drawbridge directly above the conpact roll combination and wherein only one-half of the bridge can be opened at any one time.
  • An object of the present invention is to provide an improve­ment in the method and apparatus disclosed in applicant's US-patent 4 608 l25, and to provide an alternative method and press section frame construction for apply­ing the method.
  • Another object of the present invention is to provide a frame construction of a press section which can be opened in a more simple and rapid manner than that of the Beloit "flip-top" construc­tion.
  • the intermediate frame comprises two separate frame parts, namely, a front intermediate frame and a rear intermediate frame, the front intermediate frame being pivoted about horizontal articulated joints associated with the front frame, the rear intermediate frame being pivoted around horizontal articulated joints associated with the rear frame.
  • the outer parts of the front and rear intermediate frames, relative to their points of articulation, are coupled by means of connecting parts to a stationary intermediate frame part.
  • the frame construction of a press section in accordance with the invention is characterized in that the intermediate frame arrange­ment is formed of two parts which are separately pivotable into opened and closed positions.
  • the intermediate frame arrangement comprises a front intermediate frame whlch is attached to the front frame by means of horizontal articulated joints, and a rear intermediate frame which is attached to the rear frame by means of horizontal articulated joints.
  • the front and rear intermediate frames can, in their closed positions, be fixed by means of locking parts to a stationary intermediate part of the intermediate frame arrangement.
  • Each of the front and rear intermediate frames are provided with its own actuating means by means of which it can be opened and closed.
  • the present invention differs from the method and frame construction disclosed in applicant's US-patent 4 608 l25 in that in accordance with the pre­sent invention, the intermediate frame comprises two pivoting parts, one of which is pivotally connected to the front frame and the other of which is pivotally connected to the rear frame, and wherein the intermediate frame can be locked in the closed position by means of locking members situated at the outer ends of the pivoting intermedi­ate frame parts, the locking members being coupleable onto a suitable stationary frame part which preferably comprises components associ­ated with the frames in which the journal bearings of the center roll of the press are mounted.
  • the present invention can be characterized as a "drawbridge" construction which is openable about articulated joints placed at both ends of the drawbridge so that, if necessary, both halves of the drawbridge can be opened at the same time into the open position thereby rendering the construction simpler in construction and use and openable in a more rapid manner.
  • the press section shown in FIGS. l, 2 and 3 comprises a closed press roll combination including rolls l3, l6, 2l and 3l which together form three successive press nips Ni1, N2 and N3 between them.
  • the press section also includes a fourth, separate press nip N4 formed between press rolls 33 and 43 (FIGS. 2 and 3).
  • the press section includes first and second fabrics (usually felts) l0 and 20 which run through the first press nip N1.
  • the first fabric l0 acts as a pick-up fabric and also as a press fabric in the second press nip N2.
  • a third press fabric 30 runs through the third press nip N3 and a fourth press fabric 40 comprises a lower press fabric and passes through the fourth press nip 4.
  • a pick-up roll ll is situated within the loop of the first fabric l0.
  • Pick-up roll ll has a suction zone which acts to transfer the web from the forming fabric 27 onto the run between rolls ll and l3.
  • Fabric l0 is guided by guide rolls l2.
  • the run of second fabric 20 is guided by guide rolls 22 while the run of the third fabric 30 is guided by guide rolls 32.
  • the fourth fabric 40 acts to shift the web W from the point facing the transfer roll l8 into the last press nip N4 and is guided by suction-transfer rolls 4l and 42 as well as by guide rolls 42′.
  • the run of the web W from the pick-up point P through the press section is as follows.
  • the suction sector of the pick-up roll ll detaches the web W from the wire 27 and attaches it onto the bottom face of the fabric l0 on which the web W passes through the twin-fabric nip N.1.
  • the lower roll 2l of nip N1 is provided with a hollow face 2l′. After the nip N1.
  • the web W follows the first fabric under the effect of suction sector l3a of suction roll l3.
  • the web W is transferred onto the smooth face l6′ of center roll l6 on which it is carried into the third nip N3 after which the web W follows the center roll l6 and is then guided by transfer roll l8 onto the fabric 40 within the suction sector of the suction roll 4l and further onto the other suction roll 42.
  • the web is supported by the fabric 40 as it enters the last nip N4.
  • the method and frame construction of the invention can also be applied in a compact press section in which the web has open draws and it is understood that the press rolls can be mounted and in­stalled in a manner different from that shown in the drawings.
  • the frame construction of the press section includes a front frame 50 to the top portion of which an auxiliary frame 5l is pivot­ally mounted by means of articulated joints 52 having a horizontal pivot axis.
  • the guide rolls of the first fabric l0 are mounted on the auxiliary frame 5l.
  • One of the guide rolls is mounted on a ten­sioning device 54 in order to provide suitable tensioning of fabric l0.
  • the front frame 50 is provided with intermediate pieces 35 and 55 which can be opened for replacing the first fabric l0.
  • the frame construction in­cludes a rear frame 70 to the front side of which a rear intermediate frame 60b is pivotally connected by means of a projecting part 7l so as to pivot about horizontal pivot shafts 62b.
  • the rear intermediate frame 60b is situated partly above the compact roll arrangement l3, l6, 2l and 3l.
  • the center roll l6 of the press is journalled about a fixed axis of rotation on its own frame part l9.
  • both the operation and service sides of the front frame 50, the auxiliary frame 5l, and the lower frame are interconnected by cantilever beams ll0, lll and ll4 which are supported at one end by traction members (not shown) on the lower beam.
  • the plane of the floor of the paper machine building is desig­nated 50l.
  • the intermediate frame arrangement 60 com­prises two parts, namely a front intermediate frame 60a and the rear intermediate frame 60b.
  • the front intermediate frame 60a is pivot­ally linked to the front frame 50 by means of horizontal articulated joints 62a.
  • the front intermediate frame 60a is pivoted around the horizontal shafts 62a by actuating means 64a′.
  • the front intermedi­ate frame 60a comprises substantially V- or L- shaped lateral parts which are attached by means of a connecting part 65a to an intermedi­ate part 60c of the intermediate frame arrangement 60.
  • the intermedi­ate part 60c is itself attached to bearing housings l7 fixedly mount­ed to the frame part l9 of the center roll l6 of the press.
  • Inter­mediate frame parts l4 are attached to the front intermediate frame 60a by means of horizontal articulated joints l5 and the suction roll l3 of the press is mounted on the intermediate frame parts l4.
  • the intermediate frame parts l4 can be pivoted relative the front inter­mediate frame 60a by means of power units l4a which also serve to apply a load in nips N1 and N2.
  • the rear intermediate frame 60b of the intermediate frame 60 is pivotally linked to the projecting parts 7l of the rear frame 70 by means of horizontal articulated joints 62b and can be opened and closed by actuating means 64b.
  • the press roll 3l is journalled on the rear intermediate frame 60b by means of the frame part 67b to form the third press nip N3 with center roll l6.
  • the press roll 3l can be shifted to the open posi­tion 3l′ relative to the rear intermediate frame 60b by power units 68b which also serve to apply a load in nip N3.
  • the side beams of the rear intermediate frame 60b are substantially U-shaped (when viewed from the side) and are attached to the stationary intermediate frame part 60c of the intermediate frame 60 at their ends opposite to the points of articulation 62b by means of a connecting part 65b when the intermediate frame 60 is in the closed position.
  • the intermediate frame arrangement 60 described above and shown in FIG. l thus comprises two frame parts 60a and 60b in addi­tion to a stationary part 60c which interconnects the same and can be opened and closed for the purposes described above.
  • FIG. 2 Replacement of the rolls of the press section in accordance with the method of the invention is illustrated in FIG. 2.
  • the upper auxiliary frame 5l of the front frame 50 is pivoted around the pivot shafts 52 into the open position 5l′ by opening the joints 53a, 53b.
  • the auxiliary frame 5l may also be stationary in which case it be­comes cantilevered when the fabric l0 is replaced.
  • the auxiliary frame 5l is pivotable as shown in FIG. 2, it does not have to be pivoted during replacement of a roll.
  • the fabric within the loop of which the roll to be replaced is situated is removed.
  • lifting ropes 95 are attached to the journals of the suction roll ll′ to enable the suc­tion roll to be lifted on the hooks 90 of a traverse crane.
  • the suction pick-up roll ll′ is then replaced in a conventional manner.
  • the suction roll l3 of the compact press section is suspended from lifting cables 96 which are attached to the lifting hook 9l. Suction roll l3 is lifted upwardly and shifted to the side of the press section while at the same time turning it in space T. Subsequently, the lower roll 2l of the first nip N1 is lifted in the same way by means of lifting cables 96′.
  • the suction roll l3 may be lifted either by its axle journals by means of a pair of lifting ropes or by a center-lifting technique by means of lifting lines.
  • the press roll 3l of the third press nip N3 can also be replaced, also by center-lifting, by means of lifting ropes or lines 98 attached to lifting hooks 93.
  • roll 32c Prior to replacing roll 3l, roll 32c is shifted along the path designated a2 to a temporary holding site 32a′.
  • a free space T1 is opened above the fourth press nip N4. Space T1 is opened at its upper end so that the press rolls 33 and 43 can be lifted by center-lifting.
  • the press roll 33 is lifted by lifting lines 99 attached to lifting hooks 94 while the lower roll 43 is lifted by lifting lines 99′.
  • center-lifting means that the rolls are suspended from a single crane hook supported by lifting lines which support the roll in a downwardly opening inverted V-shape sym­metrically at both sides of the vertical central plane.
  • the center­lifting technique has the advantage that the roll can be pivoted in the horizontal plane around its vertical central axis which facili­tates the shifting of the rolls even in crowded conditions.On the other hand, where a roll is lifted by its axle journals, the longi­tudinal direction of the roll usually remains fixed since the opera­tion of two cranes in cooperation is a difficult and dangerous procedure.
  • the replacement of all of the fabrics l0, 20, 30 and 40 is illustrated. It is understood, however, that it is not always the case that all of the fabrics are replaced at the same time.
  • the auxiliary frame 5l of the front frame 50 is pivoted about shaft 52 to the open position 5l′ or, in the case where the auxiliary frame 5l is station­ary, it is cantilevered and the tensioning roll for fabric l0 support­ed on the part 54 of auxiliary frame 5l is shifted to the holding site l2a′ along the path designated by arrow a1.
  • the suction roll l3 is shifted to the side position l3′ by pivoting the intermediate frame 60a to the vertical-open position 60a′ and the intermediate pieces 35 and 55 of the front frame 50 at the service side of the machine are opened so that open gaps V are formed in the frame through which gaps the felt loop l0′ is passed.
  • the suction roll l3 is shifted to the side position l3′, the press roll 2l is moved to the lower position, and the intermediate pieces 25 and the frame 26 are opened.
  • the intermediate pieces 72 and 73 are opened and the tensioning roll for fabric 30 is shifted along the path a3 to the holding site 32′ located above the rear frame 70.
  • the intermediate frame 60b is pivoted into the open position 60b′ while at the same time the press roll 3l and the guide rolls 32c and 32d (FIG. l) are also pivoted into the inner posi­tions whereby the open space T is formed to facilitate replacement of fabric 30.
  • the roll of felt 400 is pushed along a rail (not shown) which is situated in the space between the intermediate pieces 72 and 74 of the machine.
  • the roll l00 of the first fabric which is supported on a pole carried by lifting wires l0l is carried to the service side of the paper machine.
  • a loop l0′ is unwound from roll l00 which is then passed through the spaces V and through the open press nips N1 and N2 to its operating position around the canti­lever beam lll whereupon the roll l2a′ is shifted to its operating position and the auxiliary frame 5l′ pivoted into the closed position with its joints 53a, 53b being fastened.
  • the roll 200 of the second fabric wrapped around a pole carried by wires 20l is brought to the side of the paper machine whereupon a loop 20′ is un­wound from roll 200 and passed through the open spaces V and through the opened first nip N1 to its operating position around the canti­lever beams.
  • the tensioning and alignment rolls of the fabric 20 which are situated in the basement space below the floor level 50l are shifted to the upper position below roll 2l to the level of the cantilever beams ll4, such as by means of apparatus of the type disclosed in Finnish Patent Application No. 80 3020.
  • the pole supporting the roll 200 is shifted on its carrying wires 20l towards the space T in the position shown in FIG. 3 whereby the second fabric 20 becomes positioned in its operating posi­tion around the cantilever beams ll4 when the nip N2 is opened to a sufficient extent.
  • a loop 30′ is un­wound from a roll 300 wound around a pole carried by wires 30l.
  • the loop 30′ is passed through the spaces V around the various rolls 3l, etc., situated around the cantilever beams ll3.
  • the fabrics l0, 20, 30 and 40 can be replaced by a procedure which is more advantageous than in the prior art so that during replacement of the fabrics, adequate space is available for the various operations, primarily as a result of the frame parts 60a and 60b being openable to a positon most favorable for replacement of fabrics.
  • the frame parts 60a and 60b can be opened simultaneously or, alternatively, only one of them can be opened at any time, as required.
  • the rolls to be situ­ated inside the loops of the fabrics which are replaced can be situ­ated in a very small space close to each other so that the free loop to be unwound from the fabric rolls and which is fitted around the various rolls and cantilever beams can be made relatively small and preferably substantially drop-shaped which facilitates the insertion of the fabrics.
  • the method in accordance with the invention is advantageous where the fabrics are made of plastic which cannot be wrinkled to a bundle in the lateral direction.
  • the invention can also be applied to press sections of other configurations than that specifically shown and described herein.
  • the invention can be applied to press sections avialable from applicant's assignee, Valmet Oy of Finland, under the trademarks SYM-PRESS I and SYM-PRESS II, the former having only two press nips, i.e., press nips N1 and N2, and no separate nip N4, the latter having three nips N1, N2 and N3 without any separate nip N4.
  • the third and the fourth fabrics or the fourth fabric, respectively are omitted.

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  • Paper (AREA)
EP86850405A 1985-11-27 1986-11-26 Procédé et châssis dans une section de presse d'une machine à papier pour faciliter le remplacement des rouleaux et des feutres Expired - Lifetime EP0224461B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86850405T ATE61430T1 (de) 1985-11-27 1986-11-26 Verfahren und chassis in einer presspartie einer papiermaschine zum erleichtern der auswechselung von presswalzen und filzen.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3541943 1985-11-27
DE3541943A DE3541943C2 (de) 1984-11-29 1985-11-27 Pressenpartie einer Papiermaschine
FI854959 1985-12-13
FI854959A FI73025C (fi) 1985-12-13 1985-12-13 Foerfarande och en stomkonstruktion som tillaempar detta till presspartiet av en pappersmaskin foer utbyte av vaevnader och/eller valsar.

Publications (3)

Publication Number Publication Date
EP0224461A2 true EP0224461A2 (fr) 1987-06-03
EP0224461A3 EP0224461A3 (en) 1988-02-03
EP0224461B1 EP0224461B1 (fr) 1991-03-06

Family

ID=25838236

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86850405A Expired - Lifetime EP0224461B1 (fr) 1985-11-27 1986-11-26 Procédé et châssis dans une section de presse d'une machine à papier pour faciliter le remplacement des rouleaux et des feutres

Country Status (3)

Country Link
EP (1) EP0224461B1 (fr)
CA (1) CA1274108A (fr)
NO (1) NO864749D0 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0296138A2 (fr) * 1987-06-17 1988-12-21 Valmet Paper Machinery Inc. Section de presse d'une machine à papier
US5399242A (en) * 1992-05-12 1995-03-21 J.M. Voith Gmbh Machine frame for supporting dewatering elements

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1947709A1 (de) * 1968-09-27 1970-04-02 Black Clawson Co Papiermaschine
FR2372272A1 (fr) * 1976-11-30 1978-06-23 Valmet Oy Procede de detachement d'une feuille de papier a l'extremite humide d'une machine a papier
DE3205360A1 (de) * 1981-02-25 1982-09-09 Valmet Oy, 00130 Helsinki Verfahren und vorrichtung zum auswechseln eines pick-up-tuches und/oder eines presstuches der pressenpartie einer papiermaschine
DE3307362A1 (de) * 1982-03-05 1983-09-08 Valmet Oy, 00130 Helsinki Pressenpartie einer papiermaschine
DE3330423A1 (de) * 1982-08-24 1984-03-01 Valmet Oy, 00130 Helsinki Presssaugwalzenlose pressenpartie einer papiermaschine
DE3541943A1 (de) * 1984-11-29 1986-06-05 Valmet Oy, Helsinki Verfahren in einer papiermaschinenpressenpartie zum wechseln von tuechern und/oder walzen sowie eine das verfahren anwendende staenderkonstruktion der pressenpartie

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1947709A1 (de) * 1968-09-27 1970-04-02 Black Clawson Co Papiermaschine
FR2372272A1 (fr) * 1976-11-30 1978-06-23 Valmet Oy Procede de detachement d'une feuille de papier a l'extremite humide d'une machine a papier
DE3205360A1 (de) * 1981-02-25 1982-09-09 Valmet Oy, 00130 Helsinki Verfahren und vorrichtung zum auswechseln eines pick-up-tuches und/oder eines presstuches der pressenpartie einer papiermaschine
DE3307362A1 (de) * 1982-03-05 1983-09-08 Valmet Oy, 00130 Helsinki Pressenpartie einer papiermaschine
DE3330423A1 (de) * 1982-08-24 1984-03-01 Valmet Oy, 00130 Helsinki Presssaugwalzenlose pressenpartie einer papiermaschine
DE3541943A1 (de) * 1984-11-29 1986-06-05 Valmet Oy, Helsinki Verfahren in einer papiermaschinenpressenpartie zum wechseln von tuechern und/oder walzen sowie eine das verfahren anwendende staenderkonstruktion der pressenpartie

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
INDUSTRIA DELLA CARTA, Nov. 1984, vol. 22, no. 11; "La moderna sezione presse per carta da stampa" *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0296138A2 (fr) * 1987-06-17 1988-12-21 Valmet Paper Machinery Inc. Section de presse d'une machine à papier
EP0296138B1 (fr) * 1987-06-17 1992-09-23 Valmet Paper Machinery Inc. Section de presse d'une machine à papier
US5399242A (en) * 1992-05-12 1995-03-21 J.M. Voith Gmbh Machine frame for supporting dewatering elements

Also Published As

Publication number Publication date
EP0224461A3 (en) 1988-02-03
NO864749D0 (no) 1986-11-26
EP0224461B1 (fr) 1991-03-06
CA1274108A (fr) 1990-09-18

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