EP0933471B1 - Schuhpress - Google Patents

Schuhpress Download PDF

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Publication number
EP0933471B1
EP0933471B1 EP99850014A EP99850014A EP0933471B1 EP 0933471 B1 EP0933471 B1 EP 0933471B1 EP 99850014 A EP99850014 A EP 99850014A EP 99850014 A EP99850014 A EP 99850014A EP 0933471 B1 EP0933471 B1 EP 0933471B1
Authority
EP
European Patent Office
Prior art keywords
shoe
press
piston
cylinder
support
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.)
Revoked
Application number
EP99850014A
Other languages
English (en)
French (fr)
Other versions
EP0933471A2 (de
EP0933471A3 (de
Inventor
Jorma Snellman
Juha Kivimaa
Erik Brox
Lars Gustavsson
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
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Priority claimed from SE9800262A external-priority patent/SE511256C2/sv
Priority claimed from US09/183,924 external-priority patent/US6083352A/en
Application filed by Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP0933471A2 publication Critical patent/EP0933471A2/de
Publication of EP0933471A3 publication Critical patent/EP0933471A3/de
Application granted granted Critical
Publication of EP0933471B1 publication Critical patent/EP0933471B1/de
Anticipated expiration legal-status Critical
Revoked 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
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses

Definitions

  • the present invention relates to shoe presses for applying pressure to a running web of paper, paperboard, or the like. More particularly, the present invention relates to a shoe press of the type having a support which supports a press shoe adjacent to a counter roll or other backing member such that the press shoe and backing member form an extended nip therebetween, and having a hydraulic device for urging the press shoe toward the backing member to apply pressure to the web running through the nip.
  • a wet web of paper or the like from the forming section of the machine is typically carried through the nip of a shoe press of the above-described type, where the web is pressed between two layers of absorbent felt or the like for wicking moisture from the web.
  • shoe presses can also be used for calendering the web downstream of the forming section.
  • U.S. Patent No. 4,917,768 which is commonly owned with the present application, discloses a shoe press in which the press shoe is carried on the support by tubular sleeves rigidly affixed to and spaced apart on the support along the cross-machine direction, the sleeves being slidably received within cylindrical recesses in the press shoe to permit the press shoe to be moved toward and away from a counter roll for varying the nip pressure.
  • the shoe press includes hydraulic jacks upstream and downstream of the sleeves for urging the press shoe toward the counter roll and for pivoting the shoe about a cross-machine axis so as to vary the nip pressure in the machine direction.
  • the press shoe is capable of pivoting relative to the support for varying the nip pressure in the machine direction.
  • the pistons are placed in bending within the cylinders of the hydraulic jacks, and such bending can lead to malfunction of the jacks, particularly for the cylinders toward the outer ends of the shoe farthest from the centerline where thermal expansion results in relatively greater translation of the shoe relative to the support and pistons. Bending of the pistons is undesirable from the standpoint of wear on the pistons, cylinders, and seals, and can also interfere with proper functioning of the press. Additionally, thermal expansion of the shoe can cause leakage of hydraulic fluid when the seals are excessively deformed.
  • German Patent No. 195 15 832 discloses a shoe press comprising a press shoe adapted to be juxtaposed with a backing member such that a web can be carried through a nip defined there-between.
  • This prior at press further comprises a support which supports the press shoe such that the press shoe is movable in a loading direction toward the backing member and a plurality of articulated hydraulic loading cylinders spaced apart in the cross-machine direction along the press shoe.
  • a loading cylinder according to this document includes a piston member disposed within a cylinder member so as to define a working chamber pressurizable by hydraulic fluid.
  • the shoe press includes a press shoe that extends in a cross-machine direction along the full width of a web being carried through the press, and a plurality of articulated hydraulic loading cylinders spaced apart along the shoe in the cross-machine direction and supported by a support.
  • the loading cylinders define working chambers that are pressurizable by hydraulic fluid so as to cause the loading cylinders to urge the press shoe away from the support and toward a counter roll or other backing member for applying pressure to the web being carried through the nip defined between the shoe and the backing member.
  • Each loading cylinder comprises a piston member disposed within a cylinder member.
  • One of the piston and cylinder members comprises a two-piece member having a first member fixed relative to the press shoe and a second member fixed relative to the support, while the other of the piston and cylinder members comprises a coupler.
  • the two-piece member comprises first and second cylinders and the coupler comprises a piston which is slidably received within both of the cylinders.
  • the two-piece member comprises first and second pistons and the coupler comprises a cylinder which surrounds both of the pistons.
  • each coupler sealingly engages both the first and second members such that the first member is urged away from the second member in a loading direction by pressurization of the working chamber to cause the press shoe to be urged toward the backing member.
  • each coupler engages the respective first and second members at seals which enable the coupler to pivot relative to the first and second members about axes parallel to the machine direction.
  • the press shoe is free to thermally expand in the cross-machine direction without causing bending of any piston and/or cylinder members of the loading cylinders.
  • each loading cylinder includes first and second cylinders and a single piston.
  • a first working chamber is defined by the first cylinder and a first end of the piston which is slidably received therein, and a second working chamber is defined by the second cylinder and a second end of the piston which is slidably received therein.
  • Each working chamber is pressurizable with hydraulic fluid for urging the press shoe in the loading direction away from the support and toward the backing member.
  • the piston includes a passage connecting the two working chambers to enable fluid communication therebetween.
  • One of the press shoe and the support includes a supply passage for supplying pressurized hydraulic fluid into one of the first and second working chambers.
  • the supply passage is in the support for supplying fluid to the second working chamber.
  • the piston comprises a tubular member having generally cylindrical inner and outer surfaces.
  • Each of the first and second ends of the piston has an annular flange which projects radially outward beyond the cylindrical outer surface of the piston, and each flange supports a resilient compressible seal.
  • the radial dimensions of the flanges are sufficiently large in relation to their axial extent and to the axial lengths of the portions of the piston residing within the cylinders, that a substantial degree of pivotal movement of the piston is enabled relative to the cylinders about axes parallel to the machine direction.
  • the second cylinder includes a stop member which extends radially inward to a diameter smaller than the flange on the second end of the piston so as to limit movement of the piston in the loading direction away from the support.
  • a hydraulically operated shoe-retracting actuator is disposed within the interior of the piston of at least one of the loading cylinders.
  • Either the support or the shoe includes a passage adapted to supply hydraulic fluid to the shoe-retracting actuator, the actuator being operable by hydraulic pressure to retract the shoe away from the counter roll and toward the support.
  • the shoe-retracting actuator preferably comprises an actuator piston attached to the support and extending into the interior of the piston of the loading cylinder, and an actuator cylinder sealingly surrounding the actuator piston so as to define a chamber pressurizable by hydraulic fluid to urge the actuator cylinder toward the support.
  • the actuator cylinder engages a projection affixed to the press shoe such that actuation of the shoe-retracting actuator causes the press shoe to be urged toward the support.
  • the invention provides a shoe press in which the press shoe is supported so as to be freely movable in the cross-machine direction without wear, bending, or other undesirable consequences to the loading cylinders.
  • the loading cylinders also can accommodate deformations or translations of the press shoe in the machine direction, as well as pivoting of the press shoe about an axis parallel to the cross-machine direction. Additionally, the articulated loading cylinders prevent the press shoe from assuming a slanted position.
  • the shoe press 10 includes a press shoe 12 which is configured on one surface 14 thereof so as to be generally complementary in contour to a backing member such as the counter roll 16 depicted in the drawings.
  • the shoe 12 and counter roll 16 define a nip N through which a moving web W of paper, paperboard, or the like is carried.
  • the web W typically is carried by an endless belt B and is in contact with one or more press felts F or other absorbent material.
  • the shoe press 10 can be used in the press section and/or calender of a papermaking machine, and can also be used as a prepress in a forming section of a papermaking machine. It will be recognized that when used in a calender or forming section of a machine, the web W would be passed through the device 10 without any absorbent felt.
  • the shoe press 10 further includes a support 18.
  • the shoe 12 and the support 18 extend lengthwise in the cross-machine direction (as best seen in FIG. 3) along at least the full width of the web W , and preferably the shoe 12 is slightly wider than the web W .
  • the shoe 12 is supported by the support 18 and is urged toward the backing member 16 for applying pressure to the web W by a plurality of articulated hydraulic loading cylinders 20 arranged between the support 18 and the shoe 12 and spaced apart in the cross-machine direction.
  • Each loading cylinder 20 comprises a piston member and a cylinder member, one of the members being formed in two parts and the other member forming a coupler between the two parts. More particularly, the two-piece member of the loading cylinder 20 includes a first cylinder 22 that is fixed relative to the shoe 12, a second cylinder 24 that is fixed relative to the support 18 , and a piston 26 slidably received with each of the cylinders.
  • the first cylinder 22 comprises a recess formed in the shoe 12 .
  • the second cylinder 24 is a member formed separately from the support 18 and affixed thereto.
  • a first end 28 of the piston 26 is slidably received within the first cylinder 22 and a second end 30 of the piston is slidably received within the second cylinder 24 .
  • a resilient compressible seal 32 surrounds each end of the piston 26 for sealing against the inner surfaces of the cylinders.
  • a first working chamber 34 is thus defined between the first end 28 of the piston 26 and the side and end walls of the first cylinder 22
  • a second working chamber 36 is defined between the second end 30 of the piston and the side and end walls of the second cylinder 24 .
  • the piston 26 includes a passage 38 connecting the first and second working chambers so that there is fluid communication between them.
  • the support 18 includes a supply passage 40 for supplying pressurized hydraulic fluid into the second working chamber 36 .
  • the supply passage 40 connects with a bore 42 in a fastener 44 which is used for securing the second cylinder 24 to the support 18 .
  • pressurized fluid supplied through the passage 40 into the second working chamber 36 causes the first and second cylinders 22 and 24 to be urged away from each other.
  • the shoe 12 is thus urged toward the backing member 16 .
  • the first working chamber 34 is also pressurized substantially equal to the second chamber by virtue of the passage 38 in the piston 26 . Where the first and second ends 28 and 30 of the piston are essentially equal as shown in FIGS. 1-3, the net axial force on the piston 26 is thus nearly zero.
  • the piston 26 preferably includes spherical surfaces 46 which confront the inner surfaces of the cylinders 22 and 24.
  • the resilient compressible seals 32 extend radially outward of the spherical surfaces 46 into contact with the inner surfaces of the cylinders. Accordingly, the piston 26 is able to pivot about axes parallel to the machine and cross-machine directions relative to both of the cylinders while maintaining proper sealing of the working chambers.
  • FIG. 2 depicts the shoe 12 and first cylinder 22 pivoted relative to the piston 26 about an axis parallel to the cross-machine direction. Although only one of the loading cylinders 20 is depicted in FIG.
  • FIG. 3 depicts a pair of the loading cylinders 20 in which the pistons 26 have been pivoted relative to both cylinders 22 and 24 about axes parallel to the machine direction as a result of the shoe 12 being translated in the cross-machine direction (to the left in FIG. 3).
  • the loading cylinders 20 allow substantial freedom of movement of the shoe 12 in terms of both pivotal and translational movements.
  • the shoe press includes a guide rail or stop 48 for limiting the extent to which the shoe can move.
  • the loading cylinders 20 also include stop rings 50 for limiting the movement of the pistons 26 in the loading direction away from the support 18 .
  • the stop rings 50 are affixed to the outermost ends of the second cylinders 24 and extend radially inward to a diameter smaller than that of the spherical surfaces 46 on the second ends of the pistons 26 .
  • Each piston 26 has an axially extending portion 52 of reduced diameter located about midway along the axial length of the piston between the spherical surfaces 46 at each end. The reduced diameter portion 52 is smaller in diameter than the inner surface of the stop ring 50 over a sufficient axial length of the piston 26 so that the piston is capable of some range of axial movement within the second cylinder 24 .
  • the shoe press 10 also includes hydrostatic compartments 54 in the surface 14 facing the counter roll 16 for lubrication purposes, as well known in the art.
  • the compartments 54 are supplied with hydraulic fluid by a pipe 56 attached to the shoe 12 and communicating with the compartments via passages 58 in the shoe.
  • FIG. 4 depicts a second preferred embodiment of the invention in the form of a shoe press 10' having two rows of loading cylinders 20' generally as described above (the primary differences being the smaller diameters of the loading cylinders 20' ), the two rows being spaced apart in the machine direction for varying the nip pressure in the machine direction.
  • FIG. 5 illustrates a third preferred embodiment of the invention.
  • the shoe press 110 of FIG. 5 includes loading cylinders 120 in which the first cylinders 122 are formed not as recesses in the shoe 112 but rather as separate members, similar to the second cylinders 124 .
  • Hydraulic fluid is supplied to the loading cylinders 120 through passages 140 in the shoe 112 and through openings 142 in the first cylinders 122 .
  • the passages 140 may be supplied with fluid via a pipe (not shown) attached to the shoe 112 in a manner similar to that depicted in FIGS. 1-2. It will also be noted that FIG.
  • FIG. 5 illustrates the type of deformation of the shoe 112 caused by thermal expansion, whereby the two loading cylinders 120 on the left-hand side which are located on one side of the machine axial centerline have their pistons 126 pivoted in one direction about axes parallel to the machine direction, and the two loading cylinders 120 on the right-hand side of the centerline have their pistons 126 pivoted in the opposite direction about axes parallel to the machine direction.
  • the pistons 126 are hollow tubular members, as opposed to the generally solid pistons 26 and 26' of the presses shown in FIGS. 1-4. This construction of the pistons 126 results in savings in material relative to the solid-type pistons.
  • FIG. 6 depicts a fourth preferred embodiment of the invention.
  • the shoe press 110' of FIG. 6 employs loading cylinders 120' in which the two-piece member is the piston and the coupler is the cylinder.
  • the loading cylinder 120' comprises a first piston 126a affixed to the shoe 112', and second piston 126b affixed to the support 118' , and a cylinder 122' within which both pistons are slidably received.
  • a common working chamber 134' is defined between the pistons 126a and 126b.
  • Pressurized fluid is supplied to the working chamber 134' by a passage 140' in the support 118' which connects with a passage 142' that extends through a fastener 144' which secures the second piston 126b to the support 118' .
  • a ring 50' similar in function to the ring 50 of FIG. 1, is affixed to the end of the cylinder 122' adjacent the shoe 112' for preventing the first piston 126a from being withdrawn from the cylinder 122' .
  • FIG. 7 depicts a fifth preferred embodiment of the invention.
  • the shoe press 210 of FIG. 7 includes hydraulic loading cylinders 220 in which the pistons 226 are formed as hollow tubular members, and the first cylinder 222 and second cylinder 224 are separate members affixed to the press shoe 212 and the support 218 , respectively.
  • the first cylinder 222 has an end wall 223 which abuts the shoe 212 and a hollow tubular portion 225 projecting normally from the end wall 223 toward the second cylinder 224 .
  • the second cylinder 224 has an end wall 227 which abuts the support 218 and a hollow tubular portion 229 projecting normally from the end wall 227 toward the first cylinder 222 .
  • Each of the tubular portions 225 and 229 has a cylindrical inner surface.
  • the piston 226 includes flanges 231 adjacent each end of the piston.
  • the flanges 231 are generally annular and project radially outward beyond the cylindrical outer surface of the piston.
  • the radially outermost surfaces 233 of the flanges 231 are preferably but not necessarily spherical.
  • Each flange 231 includes a groove 235 continuously encircling the piston and housing a pair of resilient compressible seal rings 237a and 237b .
  • the inner seal rings 237a are preferably rubber or a material having compressibility and resilience properties similar to rubber.
  • the outer seal rings 237b which make contact with the inner surfaces of the cylinders are preferably made of a material somewhat stiffer than that of the inner seal rings.
  • a suitable material is, for example, a polymer having bronze additives, although other materials may alternatively be used.
  • the outer seal rings 237b project radially outward of the spherical surfaces 233 of the flanges and are larger in diameter than the inner surfaces of the cylinders 222, 224 in their undeformed conditions, such that there is an interference fit of the seal rings in the cylinders.
  • the seal rings 237a and 237b therefore are compressed, and their resilience keeps them in sealing contact with the cylinders throughout the range of pivotal movement of the piston 226 .
  • the lengths of the flanges 231 in the radially outward direction are sufficiently large in relation to the axial lengths of the flanges and the axial length between the two flanges so that the piston 226 is capable of pivoting over a relatively large angular range while maintain proper sealing contact of the seal rings 237b with the cylinders.
  • the first cylinders 222 are affixed to the shoe 212 by a pair of clamps 239 and 241 adjacent the upstream and downstream sides, respectively, of the shoe.
  • the clamps include ledges 243 which clamp an annular flange 245 of the first cylinder 222 between the shoe 212 and the ledges 243 .
  • the holes 247 in the clamps 239 and 241 through which fasteners are passed for securing the clamps to the shoe are not identically located relative to the ledges 243 . This enables the clamps 239 and 241 to be interchanged so as to alter the location of the first cylinder 222 relative to the shoe 212 in the machine direction.
  • the support 218 also includes an adjustment mechanism for moving the support and the second cylinder 224 in the machine direction.
  • This adjustment mechanism may be, for example, a pair of clamps (not shown) similar to the clamps 239 and 241 for securing the support 218 to a frame structure, or alternatively, a pair of such clamps for securing the second cylinder 224 to the support 218 . Accordingly, the entire loading cylinder 220 can be shifted in the machine direction relative to the shoe 212 for changing the center of load on the shoe.
  • the shoe press 210 includes features for limiting motion of the shoe 212 in the upstream, downstream, and cross-machine directions.
  • a stop 48 is positioned adjacent the downstream side of the shoe 212 for limiting the extent of downstream motion of the shoe 212 .
  • a pin 49 is affixed to the downstream side of the shoe 212 and projects outward therefrom in the machine direction.
  • the stop 48 includes a slot 51 into which the pin 49 extends.
  • the pin 49 is located at a midpoint of the width of the shoe 212 in the cross-machine direction, as shown in FIG. 7A.
  • the slot 51 extends in the loading direction so that the shoe 212 is free to move toward and away from the counter roll.
  • the slot 51 is only slightly wider than the pin 49 , and accordingly, the shoe 212 is restrained from moving in the cross-machine direction. Furthermore, the pin 49 engaged in the slot 51 ensures that thermal expansion of the shoe 212 in the cross-machine direction does not all occur in a single direction but rather occurs-in opposite directions on either side of the longitudinal centerline of the shoe press 210 .
  • the shoe press 210 also includes pins 249 affixed to the opposite side edges of the shoe 212 and projecting outward therefrom in the cross-machine direction.
  • a pair of stops 248 are positioned adjacent the opposite sides of the shoe 212 so that they can be abutted by the pins 249 when the shoe 212 moves in the upstream direction.
  • the stops 248 and pins 249 limit the extent of shoe movement in the upstream direction, and also help prevent the shoe 212 from assuming a slanted position in which one side is further upstream than the other side. It will of course be appreciated that instead of the stops 248 and pins 249 , a single elongate stop (not shown) could be positioned adjacent the upstream edge of the shoe 212 so as to serve the same purposes as the stops 248 and pins 249 .
  • FIG. 8 shows one of the loading cylinders 220' having a shoe-retracting actuator 260.
  • the actuator 260 comprises an actuator piston 262 having a stem 264 secured to the support 218 and projecting normally therefrom toward the shoe 212 .
  • An actuator cylinder 266 surrounds the actuator piston so as to define a working chamber 268 pressurizable with hydraulic fluid to cause the actuator cylinder 266 to be urged toward the support 218 .
  • the stem 264 of the actuator piston includes a passage 270 for supplying fluid into the chamber 268
  • the support 218 includes a fluid passage 272 which connects with the passage 270 in the stem.
  • the chamber 268 is constantly pressurized during operation of the shoe press so that the pressure within the chamber 268 of the shoe-retracting actuator is not substantially less than that in the working chamber 234 of the loading cylinder 220' in order to avoid damage to the actuator.
  • the press shoe 212 is to be retracted away from the counter roll, the pressure in the working chamber 234 is decreased below that in the chamber 268 .
  • the actuator cylinder 266 at the end adjacent the shoe 212 includes an annular ring 274 which extends radially inward from the cylinder side wall.
  • a projection 276 is affixed to the first cylinder 222' and extends through the central opening of the annular ring 274 .
  • the projection 276 includes a head 278 larger in diameter than the inner diameter of the ring 274 for engaging the annular ring 274 such that movement of the actuator cylinder 266 toward the support 218 causes the shoe 212 to be pulled toward the support.
  • the annular ring 274 includes holes 275 for equalizing the pressure on both sides of the ring. To aid in disassembling the press, the annular ring 274 is removably threaded into the actuator cylinder 266 .
  • the projection 276 is also removably threaded into the first cylinder 222' .
  • the first cylinder 222' includes a reinforced boss 280 into which the projection 276 is threaded.
  • the shoe 212 includes a recess 282 for accommodating the boss 280 .
  • the recess 282 is larger in diameter than the boss 280 so that the first cylinder 222' can be shifted in the machine direction by interchanging the clamps 239 and 241 , as previously described.
  • the shoe-retracting actuator 260 also enables a further advantage in addition to its function of retracting the shoe 212 . Specifically, if the hydraulic pressure within the chamber 268 of the actuator 260 is reduced below the pressure existing in the working chamber 234 , the net loading force exerted on the shoe 212 is increased above that exerted if the pressures are equal in the chambers 234 and 268 . Accordingly, the actuator 260 can also be used to increase the loading capacity of a loading cylinder without increasing the size of the loading cylinder.
  • FIG. 9 shows a sixth preferred embodiment of a loading cylinder 320 in accordance with the invention.
  • the loading cylinder 320 includes a first cylinder 322 which has a thickened end wall 323 which mounts the projection 276 of the shoe-retracting actuator 260' , and accordingly the shoe 312 does not require a recess for accommodating the projection 276 .
  • the first cylinder 322 can be shifted in the machine direction by interchanging the clamps 239 and 241 , as described above for the loading cylinder 220' .
  • the second cylinder 324 can be shifted in the machine direction in a similar manner.
  • the support 318 includes a recess 319 and the second cylinder 324 includes an end wall 325 upon which the stem 264' of the actuator piston 262' is affixed.
  • the stem 264' extends through a thickened portion 326 of the cylinder end wall 325 , and the thickened portion 326 and a part of the stem 264' extend into the recess 319 in the support 318 .
  • the recess 319 in the support 318 is wider in the machine direction than the thickened portion 326 of the second cylinder 324 so that the second cylinder 324 can be shifted in the machine direction.
  • the second cylinder 324 is secured on the support 318 by a pair of asymmetric clamps 339 and 341 in similar manner to the attachment of the first cylinder 322 to the shoe 312 by clamps 239 and 241 .
  • the second cylinder 324 is shifted in the machine direction by interchanging the clamps 339 and 341 .
  • Pressurized hydraulic fluid is supplied to the shoe-retracting actuator 260' by a flexible hose 342 which connects to an end 328 of the stem 264' projecting from the thickened portion 326 of the second cylinder end wall 325 .
  • This manner of making the fluid connection with the actuator piston 262' facilitates shifting the second cylinder 324 and the actuator 260' in the machine direction.
  • the invention provides a unique shoe press having significant advantages over prior presses, including the ability to tolerate deformations such as thermal expansion of the shoe without binding or malfunctioning of the loading cylinders.
  • the invention also provides a simple mechanism for adjusting the center of load on the shoe in the machine direction.

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Claims (17)

  1. Schuhpresse zum Aufbringen eines Drucks auf eine Bahn (W), die in einer Maschinenrichtung durch einen Spalt (N) zwischen der Schuhpresse und einem Gegenelement (16) befördert wird, mit:
    einem Pressschuh (12; 12', 112; 112'; 212), der daran angepasst ist, angrenzend an dem Gegenelement (16) derart angeordnet zu sein, dass die Bahn (W) durch den Spalt (N) befördert werden kann, der zwischen ihnen definiert ist, wobei der Pressschuh sich in einer Maschinenquerrichtung entlang im Wesentlichen der gesamten Breite der Bahn (W) erstreckt;
    einer Stütze (18; 18'; 118'; 218, 318), die den Pressschuh derart stützt, dass der Pressschuh in einer Belastungsrichtung zu dem Gegenelement (16) hin beweglich ist, um einen Druck auf die Bahn (W) aufzubringen;
    einer Vielzahl an Gelenkhydraulikbelastungszylindern (20; 20'; 120; 120'; 220; 220', 320), die in der Maschinenquerrichtung entlang des Pressschuhs beabstandet sind, wobei jeder Belastungszylinder ein Kolbenelement (26; 26'; 126; 126a, 126b; 226) hat, das innerhalb eines Zylinderelementes (22, 24; 122, 124; 122'; 222, 224; 222', 224'; 322, 324) so angeordnet ist, dass eine Arbeitskammer (34, 36; 134', 234) definiert ist, die durch ein hydraulisches Fluid mit Druck beaufschlagbar ist,
       dadurch gekennzeichnet, dass
       entweder das Kolbenelement oder das Zylinderelement ein Zweistückelement aufweist, das ein erstes Element, das relativ zu dem Pressschuh fixiert ist, und ein zweites Element hat, das relativ zu der Stütze fixiert ist und von dem ersten Element beabstandet ist, und
       das andere Element, das heißt das Zylinderelement oder das Kolbenelement einen Kuppler aufweist, der sowohl mit dem ersten als auch mit dem zweiten Element abdichtend derart in Eingriff steht, dass das erste Element von dem zweiten Element in einer Belastungsrichtung durch Druckbeaufschlagung der Arbeitskammer weg gedrängt wird, um zu bewirken, dass der Pressschuh zu dem Gegenelement (16) gedrängt wird; wobei jeder Kuppler mit jeweils dem ersten und dem zweiten Element an Dichtungen (32; 237a, 237b) in Eingriff steht, die ermöglichen, dass sich der Kuppler relativ zu dem ersten und dem zweiten Element um Achsen parallel zu der Maschinenrichtung dreht, wodurch die Gelenkhydraulikbelastungszylinder ermöglichen, dass sich der Pressschuh in der Maschinenquerrichtung relativ zu der Stütze bewegt.
  2. Pressschuh gemäß Anspruch 1, wobei
       das Zweistückelement separat ausgebildet einen ersten Zylinder (22; 122; 222; 222') und einen zweiten Zylinder (24; 124; 224; 224') aufweist, die jeweils relativ zu dem Pressschuh bzw. der Stütze fixiert sind, und wobei der Kuppler einen Kolben (26; 26'; 226) aufweist, wobei der Kolben ein erstes Ende (28), das innerhalb des ersten Zylinders aufgenommen ist, und ein zweites Ende (30) hat, das innerhalb des zweiten Zylinders aufgenommen ist.
  3. Schuhpresse gemäß Anspruch 2, wobei
       das erste Ende (28) des Kolbens (26) und der erste Zylinder (22) eine erste Arbeitskammer (34) zwischen ihnen definieren und das zweite Ende (30) des Kolbens (26) und der zweite Zylinder (24) eine zweite Arbeitskammer (36) zwischen ihnen definieren, wobei jede Arbeitskammer (34, 36) mit einem hydraulischen Fluid mit Druck beaufschlagbar ist.
  4. Schuhpresse gemäß Anspruch 3, wobei
       der Kolben einen Kanal (38) hat, der die erste Arbeitskammer (34) mit der zweiten Arbeitskammer (36) verbindet, um eine Fluidverbindung zwischen ihnen zu ermöglichen.
  5. Schuhpresse gemäß Anspruch 4, wobei
       entweder der Pressschuh (12) oder die Stütze (18) einen Lieferkanal (40) in ihm beziehungsweise in ihr hat, um mit Druck beaufschlagtes hydraulisches Fluid in entweder die erste oder die zweite Arbeitskammer (34, 36) zu liefern.
  6. Schuhpresse gemäß Anspruch 5, wobei
       der Lieferkanal sich in der Stütze (18) befindet.
  7. Schuhpresse gemäß Anspruch 2, wobei
       der Kolben (26) Kugelflächen (46) hat, um zu ermöglichen, dass sich der Kolben (26) relativ zu sowohl dem ersten Zylinder (22) als auch dem zweiten Zylinder (24) dreht.
  8. Schuhpresse gemäß Anspruch 2, wobei
       das erste Ende (28) und das zweite Ende (30) des Kolbens (26; 226) jeweils eine elastische zusammendrückbare Dichtung (32; 237a, 237b) stützen, die den Kolben umgibt, um an einer Innenfläche des entsprechenden Zylinders (22, 24; 222, 224) abzudichten.
  9. Schuhpresse gemäß Anspruch 2, wobei
       jeder Kolben so röhrenartig ist, dass er ein offenes Inneres in ihm definiert, und wobei er des Weiteren ein hydraulisch betätigtes Schuheinfahrbetätigungsglied (260; 260') aufweist, das innerhalb des Inneren von zumindest einem der Kolben angeordnet ist, wobei das Betätigungsglied durch einen hydraulischen Druck betätigbar ist, um den Schuh von der Gegenwalze weg zu drängen.
  10. Schuhpresse gemäß Anspruch 9, wobei
       das Schuheinfahrbetätigungsglied einen Betätigungskolben (262), der an der Stütze (218) angebracht ist und sich zu dem Inneren des Kolbens des Belastungszylinders (220') erstreckt, und einen Betätigungszylinder (266) aufweist, der den Betätigungskolben (262) so abdichtend umgibt, dass eine Kammer (268) definiert ist, die durch hydraulisches Fluid mit Druck beaufschlagbar ist, um den Betätigungszylinder (266) zu der Stütze (218) hin zu drängen, wobei der Betätigungszylinder (266) mit einem an dem Pressschuh fixierten Vorsprung (276) derart in Eingriff steht, dass das Betätigen des Schuheinfahrbetätigungsgliedes bewirkt, dass der Pressschuh zu der Stütze hin gedrängt wird.
  11. Schuhpresse gemäß Anspruch 10, wobei
       der Betätigungsgliedkolben (262) einen Schaft (264) hat, der an der Stütze angebracht ist und normal von dieser zu dem Pressenschuh hin vorragt, wobei der Schaft (264) einen Kanal (270) hat, der zu der Kammer (268) in dem Schuheinfahrbetätigungsglied offen ist, wobei die Stütze (218) einen Hydraulikfluidlieferkanal (272) hat, der mit dem Kanal (270) in dem Schaft (264) in Verbindung steht.
  12. Schuhpresse gemäß Anspruch 8, wobei
       der Kolben (226) ein röhrenartiges Element mit im Allgemeinen zylindrischer Innenfläche und Außenfläche aufweist, wobei sowohl das erste als auch das zweite Ende des Kolbens einen ringartigen Flansch (231) hat, der radial nach außen über die zylindrische Außenfläche des Kolbens hinaus vorragt, wobei jeder Flansch eine der elastischen zusammendrückbaren Dichtungen (237a, 237b) stützt.
  13. Schuhpresse gemäß Anspruch 12, wobei
       der erste und der zweite Zylinder (222, 224) becherförmige Elemente aufweisen, die jeweils eine Endwand (223, 227), die an dem Pressschuh beziehungsweise an der Stütze befestigt ist, und einen röhrenartigen Abschnitt (225, 229) haben, der mit der Endwand verbunden ist und sich zu dem anderen Zylinder hin erstreckt, wobei jeder röhrenartige Abschnitt eine zylindrische Innenfläche definiert, die mit einer der Dichtungen an dem Kolben abdichtend in Eingriff steht.
  14. Schuhpresse gemäß Anspruch 13, wobei
       der röhrenartige Abschnitt (229) des zweiten Zylinders (224) ein Anschlagelement hat, das sich radial nach innen zu einem Durchmesser erstreckt, der geringer als der Flansch (231) an dem zweiten Ende des Kolbens (226) ist, um so die in der Belastungsrichtung von der Stütze (218) weg erfolgende Bewegung des Kolbens zu begrenzen.
  15. Schuhpresse gemäß Anspruch 1, wobei
       die Belastungszylinder (20') in zwei Reihen angeordnet sind, die in der Maschinenrichtung beabstandet sind, wobei die Belastungzylinder in einer der Reihen unabhängig von den Belastungszylindern in der anderen Reihe derart hydraulisch mit Druck beaufschlagbar sind, dass der Spaltdruck in der Maschinenrichtung variiert werden kann.
  16. Schupresse gemäß Anspruch 1, wobei
       der Kuppler einen Zylinder (120') aufweist und das Zweistückelement einen ersten Kolben (126a), der relativ zu dem Pressschuh fixiert ist, und einen zweiten Kolben (126b) aufweist, der relativ zu der Stütze fixiert ist, wobei der Zylinder abdichtend beide Kolben so umgibt, dass eine gemeinsame Arbeitskammer (134') zwischen den Kolben definiert ist.
  17. Schuhpresse gemäß Anspruch 1, die des Weiteren einen einstellbaren Befestigungsmechanismus (239, 241) aufweist, der das erste Element an dem Schuh sichert, wobei der Befestigungsmechanismus betreibbar ist, um den Ort des ersten Elementes relativ zu dem Schuh in der Maschinenrichtung einzustellen.
EP99850014A 1998-01-30 1999-01-29 Schuhpress Revoked EP0933471B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SE9800262A SE511256C2 (sv) 1998-01-30 1998-01-30 Skopress
SE9800262 1998-01-30
US09/183,924 US6083352A (en) 1998-01-30 1998-10-30 Shoe press
US183924 1998-10-30

Publications (3)

Publication Number Publication Date
EP0933471A2 EP0933471A2 (de) 1999-08-04
EP0933471A3 EP0933471A3 (de) 1999-08-18
EP0933471B1 true EP0933471B1 (de) 2003-03-26

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EP99850014A Revoked EP0933471B1 (de) 1998-01-30 1999-01-29 Schuhpress

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EP (1) EP0933471B1 (de)
JP (1) JPH11279976A (de)
AT (2) ATE235598T1 (de)
CA (1) CA2259768C (de)
DE (2) DE29900914U1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE515484C2 (sv) * 1999-12-10 2001-08-13 Metso Paper Inc Pressanordning med förlängt pressnyp för pressning av en löpande papper- eller kartongbana
EP1266081A1 (de) * 2000-02-18 2002-12-18 Metso Paper Karlstad Aktiebolag Langspaltpresse zum pressen von laufenden papier- oder pappebahnen
SE516410C2 (sv) * 2000-05-29 2002-01-15 Valmet Karlstad Ab Press i en maskin för framställning av en kontinuerligt löpande bana av cellulosahaltigt fibermaterial och förfarande för att förändra tryckprofilen i en sådan press
FI107063B (fi) * 2000-06-19 2001-05-31 Metso Paper Inc Paperi- tai kartonkikoneen pitkänippipuristin
FI116227B (fi) * 2001-07-05 2005-10-14 Vaahto Oy Pitkänippipuristin
DE602004008751T2 (de) * 2004-06-11 2008-06-12 Metso Paper, Inc. Schuhpresse
DE102007004607A1 (de) * 2007-01-30 2008-07-31 Gapcon Gmbh Belastungseinrichtung für eine Schuhpresswalze
FI126727B (fi) * 2012-10-19 2017-04-28 Valmet Technologies Inc Kenkätela, pitkänippipuristin ja kuiturainakone

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4423212C1 (de) * 1994-07-01 1996-03-07 Escher Wyss Gmbh Walzenanordnung
DE19515832C1 (de) * 1995-04-29 1996-05-02 Voith Sulzer Papiermasch Gmbh Schuhpreßwalze für eine Papiermaschine

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Publication number Publication date
DE69906167D1 (de) 2003-04-30
ATE235598T1 (de) 2003-04-15
DE69906167T2 (de) 2003-12-11
CA2259768A1 (en) 1999-07-30
CA2259768C (en) 2004-05-11
DE29900914U1 (de) 1999-12-23
EP0933471A2 (de) 1999-08-04
AT3188U1 (de) 1999-11-25
JPH11279976A (ja) 1999-10-12
EP0933471A3 (de) 1999-08-18

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