EP0740016A1 - Rouleau de presse à pincage élargi pour une machine à papier - Google Patents

Rouleau de presse à pincage élargi pour une machine à papier Download PDF

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Publication number
EP0740016A1
EP0740016A1 EP96101385A EP96101385A EP0740016A1 EP 0740016 A1 EP0740016 A1 EP 0740016A1 EP 96101385 A EP96101385 A EP 96101385A EP 96101385 A EP96101385 A EP 96101385A EP 0740016 A1 EP0740016 A1 EP 0740016A1
Authority
EP
European Patent Office
Prior art keywords
shoe
press
pressure chamber
pressure
piston
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
EP96101385A
Other languages
German (de)
English (en)
Other versions
EP0740016B1 (fr
Inventor
Christian Schiel
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.)
Voith Patent GmbH
Original Assignee
Voith Sulzer Papiermaschinen GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Sulzer Papiermaschinen GmbH filed Critical Voith Sulzer Papiermaschinen GmbH
Publication of EP0740016A1 publication Critical patent/EP0740016A1/fr
Application granted granted Critical
Publication of EP0740016B1 publication Critical patent/EP0740016B1/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
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses

Definitions

  • the invention relates to a shoe press roll for a paper machine which forms a press nip with a counter roll, through which a press jacket guided over the shoe press roll rotates together with a paper web, the shoe press roll comprising a press shoe which can be pressed against the counter roll via at least one hydraulic element, wherein the at least one hydraulic element is designed as a cylinder / piston unit between a stationary support body and the press shoe and a first, Comprised with hydraulic pressure chamber which communicates via a passage with a second pressure chamber open to the press shoe, which abuts on the edge with a sealing surface on the press shoe.
  • a shoe press roll of this type is known from DE 43 19 323 A1.
  • the press shoe can be pressed against a counter roll by a hydraulic press unit, the hydraulic press unit essentially extending in the longitudinal direction of the press shoe.
  • a plurality of hydraulic pressure or relief units are arranged within the hydraulic pressure unit in order to enable the pressing force to be metered along the longitudinal extent of the pressure shoe.
  • the pressure or relief units each comprise a hydraulic piston which is axially displaceable in a cylindrical recess of the support body by means of a sealing ring and can be tilted to a certain degree.
  • the hydraulic piston rests on the underside of the press shoe by means of an annular sealing surface. Since during the operation of the press shoe z. B.
  • the piston is pressed by a coil spring against the underside of the press shoe in the known embodiment to avoid hydraulic fluid from the hydraulic chamber laterally between the sealing surface and exit the press shoe when tilted.
  • the piston is also secured against escape during assembly by a chain which is fastened to the support body. This chain is secured by means of a bolt on a continuous radial web of the piston, through which the pressure chamber is delimited upwards in the direction of the press shoe.
  • a large bore is provided in the radial web, so that the second pressure chamber which is formed above the pressure chamber and is open to the press shoe is completely included the first pressure chamber communicates and the hydraulic pressure is transmitted directly to the underside of the press shoe.
  • a disadvantage of the known arrangement has proven to be the relatively complicated structure and the relatively complicated assembly due to the spiral spring and the safety chain.
  • the object of the invention is therefore to improve a shoe press roll of the type mentioned in such a way that construction and assembly can be carried out in the simplest and cheapest possible manner.
  • this is achieved in that the passage between the two pressure chambers is designed as a throttle point.
  • the object of the invention is completely achieved, since it is possible to dispense with the installation of a spiral spring and a corresponding securing element, since the throttle point can be dimensioned in such a way that when the press shoe is in contact with the sealing surface, essentially the same pressure prevails in both pressure chambers .
  • the result of this is that, in normal operation, when the piston bears with its sealing surface directly on the press shoe, the hydraulic pressure is completely transmitted to the press shoe. If, however, the press shoe tilts to a certain degree during operation, hydraulic oil can flow laterally from the second pressure chamber emerge from the press shoe and the sealing surface.
  • the throttle point is provided for hydraulic support of the press shoe, the flow through the throttle point during operation being practically zero.
  • one or more sealing rings can be inserted in the sealing surface for sealing against the press shoe.
  • the cylinder / piston unit comprises a recess on the support body, in which a piston is guided axially displaceably and tiltably by means of a seal.
  • the first pressure chamber of the piston is closed off from the second pressure chamber by a loose disk which bears against a projection of the piston under the action of the hydraulic pressure in the first pressure chamber.
  • This disc which is similar to a valve disk, can lift off the projection of the piston, which is preferably designed as a ring web, in the event of sudden pressure relief, so that any compressed air can escape from the upper pressure chamber over the enlarged relief cross section on the circumference of the disc.
  • a shoe press is schematically sketched in the area of the press nip 14, which comprises a shoe press roll 10 with a press shoe 16, which is assigned a counter roll 12.
  • a press jacket 18 is guided through the press nip 14 in a known manner over the press shoe 16 and runs largely frictionlessly over the press shoe 16 on a hydrodynamic lubricating wedge.
  • a paper web 22 to be dewatered is also usually guided through the press nip 14 together with at least one felt web 20.
  • the press shoe 16 can be pressed against the counter-roller 12 by means of a plurality of hydraulic elements, which are supported on an underlying stationary support body 24 according to FIG. 2.
  • Each hydraulic element is designed as a cylinder / piston unit 26, which comprises a cylindrical recess 48 in the support body 24, in which a piston 40 is guided.
  • the piston 40 has at its lower end facing the cylindrical recess 48 an outer collar 42, within which an annular groove 44 is provided, in which a seal 46 in the form of a sealing ring is provided.
  • the piston 40 is guided axially displaceably with the seal 46 on the inner surface 50 of the cylindrical recess 48 and can be tilted by a certain amount.
  • the piston 40 lies at its end facing the press shoe 16 with an annular sealing surface 36 on a flat contact surface 17 of the press shoe 16.
  • An annular groove 38 is provided within the annular sealing surface 36, in which a sealing ring 34 is held.
  • two pressure chambers are formed, namely a first pressure chamber 28 between the cylindrical recess 48 and the piston 40, which is opposite a second pressure chamber 30 between the piston 40 and the press shoe 16 by a radial one Web 54 is separated, which forms a piston crown.
  • a thin throttle point 32 is provided within the radial web 54, through which a connection between the first pressure chamber 28 and the second pressure chamber 30 is formed.
  • the diameter of the throttle point 32 is dimensioned such that, under approximately static conditions, when the press shoe 16 with its flat contact surface 17 lies completely against the sealing surface 36 of the piston 40, the pressure in the second pressure chamber 30 is the same as in the first pressure chamber 28. so that the hydraulic pressure transmitted into the first pressure chamber 28 via a hydraulic channel 52 is transmitted directly to the press shoe 16 via the second pressure chamber 30.
  • the diameter is at most about 5 mm, preferably about 1 to 4 mm. If several throttling points are used, the diameter is correspondingly smaller.
  • hydraulic oil can escape laterally from the second pressure chamber 30 through the gap then formed between the contact surface 17 of the press shoe 16 and the sealing surface 36 of the piston 40.
  • FIGS. 3 and 4 An alternative embodiment of the invention is shown in FIGS. 3 and 4.
  • the same reference numbers are used for the same parts.
  • the piston 40 ' is not closed at the top by a piston head, but only by a loose disk 64 which is penetrated by the central throttle point 32'.
  • This disk 64 is designed similarly to a valve disk and is under pressure against an annular web 56 of the piston 40 '.
  • the disk 64 has four outer projections 58 at regular angular intervals of 90 °, by means of which it is centered on the inner surface 60 of the piston 40 '.
  • the disk 64 can lift off the annular web 56, and compressed air which may be present laterally in the pressure chamber 30 can thus quickly relax via the enlarged relief cross section on the periphery of the disk 64.
  • a spring 62 for pressing the piston 40 'against the press shoe 16 is shown in FIG. 3.
  • Such a spring can also be provided if complete tightness of the cylinder / piston unit is also desired when starting off.
  • this spring is much weaker than in conventional hydraulic elements, since it preferably transmits less than approximately 20% of the contact pressure to the press shoe 16.
  • throttle point instead of a throttle point, several appropriately dimensioned throttle points can of course also be provided.
  • an insert can also be used in the support body 24, in which the cylindrical recess 48 can be formed, in which the piston is guided with its seal.
  • the recess 48 does not have to be cylindrical, but can also have a rectangular or other shaped cross section.

Landscapes

  • Paper (AREA)
  • Rolls And Other Rotary Bodies (AREA)
EP96101385A 1995-04-29 1996-02-01 Rouleau de presse à pinçage élargi pour une machine à papier Expired - Lifetime EP0740016B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19515832A DE19515832C1 (de) 1995-04-29 1995-04-29 Schuhpreßwalze für eine Papiermaschine
DE19515832 1995-04-29

Publications (2)

Publication Number Publication Date
EP0740016A1 true EP0740016A1 (fr) 1996-10-30
EP0740016B1 EP0740016B1 (fr) 2000-05-10

Family

ID=7760712

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96101385A Expired - Lifetime EP0740016B1 (fr) 1995-04-29 1996-02-01 Rouleau de presse à pinçage élargi pour une machine à papier

Country Status (7)

Country Link
US (1) US5688375A (fr)
EP (1) EP0740016B1 (fr)
JP (1) JPH08302582A (fr)
AT (1) ATE192800T1 (fr)
CA (1) CA2173890A1 (fr)
DE (1) DE19515832C1 (fr)
FI (1) FI113068B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005080675A1 (fr) 2004-02-19 2005-09-01 Vaahto Oy Procede et appareil utilises conjointement a une presse a sabot
WO2005080674A1 (fr) 2004-02-19 2005-09-01 Vaahto Oy Dispositif de charge pour une presse de chaussure

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19607211C2 (de) * 1995-04-29 2003-11-20 Voith Sulzer Papiermasch Gmbh Schuhpreßwalze für eine Papiermaschine
US6139691A (en) * 1997-09-30 2000-10-31 Valmet-Karlstad Ab Shoe press
US6159342A (en) * 1997-09-30 2000-12-12 Valmet-Karlstad Ab Shoe press
SE510551C2 (sv) * 1997-09-30 1999-05-31 Valmet Karlstad Ab Skopress för pappers- eller kartongmaskiner
SE510610C2 (sv) * 1997-09-30 1999-06-07 Valmet Karlstad Ab Skopress för en pappers- eller kartongmaskin, samt en anpressningscylinderenhet för en sådan
SE510609C2 (sv) * 1997-09-30 1999-06-07 Valmet Karlstad Ab Skopress för en pappers- eller kartongmaskin
US6093283A (en) * 1997-09-30 2000-07-25 Valmet-Karlstad Ab Shoe press and method for supporting a press shoe in a shoe press
SE510553C2 (sv) * 1997-09-30 1999-05-31 Valmet Karlstad Ab Skopress för en pappers- eller kartongmaskin
SE510550C2 (sv) * 1997-09-30 1999-05-31 Valmet Karlstad Ab Skopress för pappers- eller kartongmaskiner
SE510552C2 (sv) * 1997-09-30 1999-05-31 Valmet Karlstad Ab Skopress och sätt för lagring av en pressko i en skopress
US6042694A (en) * 1997-09-30 2000-03-28 Valmet-Karlstad Ab Shoe press
US5997696A (en) * 1997-09-30 1999-12-07 Valmet-Karlstad Ab Shoe press
US6017422A (en) * 1997-09-30 2000-01-25 Valmet-Karlstad Ab Shoe press
US6083352A (en) * 1998-01-30 2000-07-04 Valmet Corporation Shoe press
CA2259768C (fr) * 1998-01-30 2004-05-11 Valmet Corporation Sabot de presse
US6248210B1 (en) 1998-11-13 2001-06-19 Fort James Corporation Method for maximizing water removal in a press nip
FI19992824A (fi) * 1999-12-30 2001-07-01 Valmet Karlstad Ab Laite nipin muodostamiseksi
FI107063B (fi) * 2000-06-19 2001-05-31 Metso Paper Inc Paperi- tai kartonkikoneen pitkänippipuristin
DE102006021428A1 (de) 2006-05-05 2007-11-08 Andritz Küsters GmbH & Co. KG Vorrichtung zum Bilden mindestens eines Langspalts
DE102007004607A1 (de) 2007-01-30 2008-07-31 Gapcon Gmbh Belastungseinrichtung für eine Schuhpresswalze

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2202306A (en) * 1987-03-10 1988-09-21 Escher Wyss Ag Rollers
DE4319323A1 (de) * 1993-06-11 1993-11-04 Voith Gmbh J M Verfahren zum betreiben einer pressenpartie und vorrichtung zum durchfuehren des verfahrens

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI73301C (fi) * 1986-05-30 1987-09-10 Valmet Oy Stoedarrangemang foer glidskorna av en zonreglerbar boejningskompenserad vals.
DE3705241A1 (de) * 1986-12-24 1988-07-07 Escher Wyss Gmbh Verfahren zur mechanisch-thermischen entwaesserung einer faserstoffbahn
US5447605A (en) * 1994-08-22 1995-09-05 Beloit Technologies, Inc. Position control for self-loading roll

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2202306A (en) * 1987-03-10 1988-09-21 Escher Wyss Ag Rollers
DE4319323A1 (de) * 1993-06-11 1993-11-04 Voith Gmbh J M Verfahren zum betreiben einer pressenpartie und vorrichtung zum durchfuehren des verfahrens

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005080675A1 (fr) 2004-02-19 2005-09-01 Vaahto Oy Procede et appareil utilises conjointement a une presse a sabot
WO2005080674A1 (fr) 2004-02-19 2005-09-01 Vaahto Oy Dispositif de charge pour une presse de chaussure

Also Published As

Publication number Publication date
US5688375A (en) 1997-11-18
CA2173890A1 (fr) 1996-10-30
FI113068B (fi) 2004-02-27
EP0740016B1 (fr) 2000-05-10
FI960908A0 (fi) 1996-02-27
FI960908A (fi) 1996-10-30
ATE192800T1 (de) 2000-05-15
DE19515832C1 (de) 1996-05-02
JPH08302582A (ja) 1996-11-19

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