EP1027490B1 - Shoe press - Google Patents

Shoe press Download PDF

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Publication number
EP1027490B1
EP1027490B1 EP98946772A EP98946772A EP1027490B1 EP 1027490 B1 EP1027490 B1 EP 1027490B1 EP 98946772 A EP98946772 A EP 98946772A EP 98946772 A EP98946772 A EP 98946772A EP 1027490 B1 EP1027490 B1 EP 1027490B1
Authority
EP
European Patent Office
Prior art keywords
press
shoe
hydraulic fluid
duct
pipe
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
EP98946772A
Other languages
German (de)
French (fr)
Other versions
EP1027490A1 (en
Inventor
Joakim Palmgren
Mikael Nyman
Erik Brox
Nils-Erik Säfman
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 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 EP1027490A1 publication Critical patent/EP1027490A1/en
Application granted granted Critical
Publication of EP1027490B1 publication Critical patent/EP1027490B1/en
Anticipated expiration legal-status Critical
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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 a shoe press for paper/board machines, comprising a press shoe and a counter roll, which between themselves form an extended nip for a paper or cardboard web and for a circulated flexible belt, at least one hydraulic loading cylinder with a working chamber supplied with hydraulic fluid and adapted to press the press shoe against the counter roll, and a hydraulic fluid chamber supplied with hydraulic fluid and positioned between the side of the press shoe facing the loading cylinder and the opposing side of the loading cylinder.
  • DE-195 15 832 discloses a shoe press in which the supplying of the pressure chamber with hydraulic fluid is carried out via a throttle extended from the working chamber and arranged in the piston of the loading cylinder.
  • a drawback of this known arrangement is that the ratio of the pressure in the working chamber to the pressure in the hydraulic fluid chamber is already locked at the construction stage.
  • the object of the invention is to eliminate this drawback.
  • hydraulic fluid thus is supplied separately to the working chamber of the loading cylinder and to the hydraulic fluid chambers, whereby the pressure conditions of the working chamber and the hydraulic fluid chamber can be monitored and controlled separately, which ensures that the shoe is always able to move in relation to the loading cylinder, thereby eliminating the risk of the thermal expansion and motions of the shoe being transferred to lateral forces between piston and cylinder wall.
  • Fig. 1 is a cross-sectional view of the first embodiment of the shoe press
  • Fig. 2 is a cross-sectional view of the second embodiment of the shoe press.
  • press shoe is made in a single piece and extends in the cross direction, whereas loading cylinders, hydrostatic compartments and pressure chambers can be several in number, distributed in the longitudinal direction of the press shoe (cross direction).
  • the shoe press comprises a press shoe 300 and a counter roll 312, which form a nip N between themselves.
  • nip N runs a paper web W which is to be dewatered, a circulated flexible press belt 311 and a press felt F.
  • the press shoe is pressed against the counter roll 312 by means of a loading cylinder 310 with piston 330 and cylinder part 340.
  • An O-ring seal therebetween is designated 380.
  • the piston is attached to the horizontal beam 309 included in the frame system of the shoe press, by means of screws 350.
  • the working chamber 325 of the loading cylinder 310 is supplied with hydraulic fluid by means of a horizontal duct 326 which is formed in the piston and which is shared by all the pistons, and a vertical duct 327 formed in the piston.
  • a hydraulic fluid chamber 301 between the upper surface of the cylinder part 340 and the opposing side of the press shoe is delimited by an O-ring seal 336.
  • the hydraulic fluid chamber 301 is supplied with hydraulic fluid through a duct 302 formed in the press shoe and having duct parts 302' and 302".
  • the duct 302 receives the hydraulic fluid from a pipe 303 which extends in the longitudinal direction of the press shoe and is attached to one longitudinal side edge 304 (in this case, the rising side) of the press shoe 300 by means of screws 305, which engage in threaded holes 305' in the press shoe.
  • the duct or bore 306 of the pipe 303 communicates with the duct 302 by means of a throttle 308.
  • the pipe 303 can be supplied with hydraulic fluid through its one end or both ends.
  • the hydraulic fluid to the working chamber 305 and to the hydraulic fluid chamber 301 can have the same source, i.e. the ducts 306 and 326 can be branches of a common supply of hydraulic fluid (usually oil) and the fluid pressure in the working chamber 325 and the pressure chamber 311 can be controlled separately, for instance, by means of throttles and/or other known pressure control means, or different sources can be used for said hydraulic fluid supply.
  • the hydraulic fluid chamber 301 has a slightly smaller area than the working chamber 325.
  • the embodiment in Fig. 2 comprises the press shoe 400, the counter roll 312, the circulated press belt 311, the loading cylinder 410 with cylinder part 410A and piston 410B, a seal 480 arranged therebetween, and ducts 426 and 427 for supplying hydraulic fluid to the working chamber 425 of the loading cylinder.
  • the hydraulic fluid chamber 301 is also in this case supplied with hydraulic fluid via ducts 402 with part 402" formed in the press shoe and receiving the hydraulic fluid from a pipe 403 attached to one longitudinal side edge of the press shoe, via a hole 408.
  • the pipe is attached by means of screws 405 and screw holes 405'.
  • the duct 402 opens into the hydraulic fluid chamber 301 by means of a throttle 402A.
  • a feed pipe is designated 411.
  • the shoe press in Fig. 2 also has a hydrostatic compartment 401 in its side facing the counter roll 312.
  • This hydraulic fluid is supplied by means of a duct 402' branched off from the duct 402.
  • the hole 408 in the pipe 403 in the form of a throttle delimits the hydraulic fluid flow to the compartment 401 to the desired level.
  • the throttle 402A prevents the hydraulic fluid flow through the nip N from disappearing completely if the hydraulic fluid chamber 301 should leak.
  • the hydraulic fluid chamber 301 has in this case a greater area than the working chamber 325.
  • the pipes 303 and 403 are preferably made of aluminium, of which also the press shoe is usually made, and is manufactured by extrusion. By loosening the screw joints 305/305' and 405/405', the pipes 303 and 403 can be replaced with other pipes 303 and 403 having different dimensions, a different size of throttle etc.
  • the inventive shoe press is applicable also to calendering operations in a paper or board machine.

Description

The present invention relates to a shoe press for paper/board machines, comprising a press shoe and a counter roll, which between themselves form an extended nip for a paper or cardboard web and for a circulated flexible belt, at least one hydraulic loading cylinder with a working chamber supplied with hydraulic fluid and adapted to press the press shoe against the counter roll, and a hydraulic fluid chamber supplied with hydraulic fluid and positioned between the side of the press shoe facing the loading cylinder and the opposing side of the loading cylinder.
DE-195 15 832 discloses a shoe press in which the supplying of the pressure chamber with hydraulic fluid is carried out via a throttle extended from the working chamber and arranged in the piston of the loading cylinder. A drawback of this known arrangement is that the ratio of the pressure in the working chamber to the pressure in the hydraulic fluid chamber is already locked at the construction stage. The object of the invention is to eliminate this drawback.
The object is achieved by a shoe press according to claim 1. Advantageous embodiments have the characteristic features stated in the dependent claims.
According to the invention, hydraulic fluid thus is supplied separately to the working chamber of the loading cylinder and to the hydraulic fluid chambers, whereby the pressure conditions of the working chamber and the hydraulic fluid chamber can be monitored and controlled separately, which ensures that the shoe is always able to move in relation to the loading cylinder, thereby eliminating the risk of the thermal expansion and motions of the shoe being transferred to lateral forces between piston and cylinder wall.
The invention will now be described in more detail with the aid of two embodiments, both concerning the use of a shoe press according to the invention in the press section of a paper or board machine.
Fig. 1 is a cross-sectional view of the first embodiment of the shoe press, and Fig. 2 is a cross-sectional view of the second embodiment of the shoe press.
It is understood that the press shoe is made in a single piece and extends in the cross direction, whereas loading cylinders, hydrostatic compartments and pressure chambers can be several in number, distributed in the longitudinal direction of the press shoe (cross direction).
Reference is made to Fig. 1. The shoe press comprises a press shoe 300 and a counter roll 312, which form a nip N between themselves. In the nip N runs a paper web W which is to be dewatered, a circulated flexible press belt 311 and a press felt F. The press shoe is pressed against the counter roll 312 by means of a loading cylinder 310 with piston 330 and cylinder part 340. An O-ring seal therebetween is designated 380. The piston is attached to the horizontal beam 309 included in the frame system of the shoe press, by means of screws 350. The working chamber 325 of the loading cylinder 310 is supplied with hydraulic fluid by means of a horizontal duct 326 which is formed in the piston and which is shared by all the pistons, and a vertical duct 327 formed in the piston.
A hydraulic fluid chamber 301 between the upper surface of the cylinder part 340 and the opposing side of the press shoe is delimited by an O-ring seal 336. The hydraulic fluid chamber 301 is supplied with hydraulic fluid through a duct 302 formed in the press shoe and having duct parts 302' and 302". The duct 302 receives the hydraulic fluid from a pipe 303 which extends in the longitudinal direction of the press shoe and is attached to one longitudinal side edge 304 (in this case, the rising side) of the press shoe 300 by means of screws 305, which engage in threaded holes 305' in the press shoe. The duct or bore 306 of the pipe 303 communicates with the duct 302 by means of a throttle 308. The pipe 303 can be supplied with hydraulic fluid through its one end or both ends. The hydraulic fluid to the working chamber 305 and to the hydraulic fluid chamber 301 can have the same source, i.e. the ducts 306 and 326 can be branches of a common supply of hydraulic fluid (usually oil) and the fluid pressure in the working chamber 325 and the pressure chamber 311 can be controlled separately, for instance, by means of throttles and/or other known pressure control means, or different sources can be used for said hydraulic fluid supply. The hydraulic fluid chamber 301 has a slightly smaller area than the working chamber 325.
The embodiment in Fig. 2 comprises the press shoe 400, the counter roll 312, the circulated press belt 311, the loading cylinder 410 with cylinder part 410A and piston 410B, a seal 480 arranged therebetween, and ducts 426 and 427 for supplying hydraulic fluid to the working chamber 425 of the loading cylinder. The hydraulic fluid chamber 301 is also in this case supplied with hydraulic fluid via ducts 402 with part 402" formed in the press shoe and receiving the hydraulic fluid from a pipe 403 attached to one longitudinal side edge of the press shoe, via a hole 408. The pipe is attached by means of screws 405 and screw holes 405'. The duct 402 opens into the hydraulic fluid chamber 301 by means of a throttle 402A. A feed pipe is designated 411.
The shoe press in Fig. 2 also has a hydrostatic compartment 401 in its side facing the counter roll 312. This hydraulic fluid is supplied by means of a duct 402' branched off from the duct 402. The hole 408 in the pipe 403 in the form of a throttle delimits the hydraulic fluid flow to the compartment 401 to the desired level.
The throttle 402A prevents the hydraulic fluid flow through the nip N from disappearing completely if the hydraulic fluid chamber 301 should leak. The hydraulic fluid chamber 301 has in this case a greater area than the working chamber 325.
The pipes 303 and 403 are preferably made of aluminium, of which also the press shoe is usually made, and is manufactured by extrusion. By loosening the screw joints 305/305' and 405/405', the pipes 303 and 403 can be replaced with other pipes 303 and 403 having different dimensions, a different size of throttle etc.
The inventive shoe press is applicable also to calendering operations in a paper or board machine.

Claims (11)

  1. A shoe press for paper or board machines, comprising a press shoe (300; 400) and a counter roll (312), which between themselves form an extended nip (N) for a paper or cardboard web (W) and for a circulated flexible belt (311), at least one hydraulic loading cylinder (310, 410) with a working chamber (325; 425) supplied with hydraulic fluid and adapted to press the press shoe (300; 400) against the counter roll (312), and a hydraulic fluid chamber (301) between the side of the press shoe (300; 400) facing the loading cylinder (310;410) and the opposing side of the loading cylinder (310; 410), characterised in that the working chamber (325; 425) and the hydraulic fluid chamber (301) do not communicate with each other and are arranged for hydraulic fluid supply independently of each other.
  2. A shoe press as claimed in claim 1, characterised by a duct (302; 402) formed in the press shoe (300; 400) and adapted to supply the hydraulic fluid chamber (301) with hydraulic fluid.
  3. A shoe press as claimed in claim 2, characterised by a pipe (303; 403) attached to one longitudinal side edge of the press shoe (300; 400) and communicating with said duct (302; 402) via a hole (308; 408) formed in the pipe wall.
  4. A shoe press as claimed in claim 3, characterised in that the hole (308; 408) forms a throttle.
  5. A shoe press as claimed in any one of claims 1-4, characterised in that the duct (402) opens into the hydraulic fluid chamber (301) via a throttle (402A).
  6. A shoe press as claimed in any one of claims 1-5, characterized in that a hydrostatic compartment (401) is formed in the surface of the press shoe facing the counter roll, and in that said duct (402) has a branch (402') to the hydrostatic compartment (401).
  7. A shoe press as claimed in any one of claims 1-6, characterised in that the area of the hydraulic fluid chamber (301) is greater than that of the working chamber (425).
  8. A shoe press as claimed in any one of claims 1-6, characterised in that the area of the hydraulic fluid chamber (301) is smaller than that of the working chamber (325).
  9. A shoe press as claimed in any one of claims 3-8, characterised in that the pipe (303; 403) is releasably attached to the press shoe (300; 400).
  10. A shoe press as claimed in claim 9, characterised in that the pipe (303; 403) is attached to the press shoe (300; 400) by means of screws (305; 405) and screw holes (305'; 405') formed in the press shoe (300; 400).
  11. A shoe press as claimed in any one of claims 3-10, characterised in that the pipe (303; 403) is made of aluminium by extrusion.
EP98946772A 1997-09-30 1998-09-30 Shoe press Expired - Lifetime EP1027490B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9703572A SE510550C2 (en) 1997-09-30 1997-09-30 Shoe press for paper or cardboard machines
SE9703572 1997-09-30
PCT/SE1998/001761 WO1999016970A1 (en) 1997-09-30 1998-09-30 Shoe press

Publications (2)

Publication Number Publication Date
EP1027490A1 EP1027490A1 (en) 2000-08-16
EP1027490B1 true EP1027490B1 (en) 2003-02-26

Family

ID=20408467

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98946772A Expired - Lifetime EP1027490B1 (en) 1997-09-30 1998-09-30 Shoe press

Country Status (4)

Country Link
EP (1) EP1027490B1 (en)
DE (1) DE69811707T2 (en)
SE (1) SE510550C2 (en)
WO (1) WO1999016970A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10036674A1 (en) * 2000-06-07 2001-12-13 Voith Paper Patent Gmbh Shoe press for paper or cardboard web has piston/cylinder units where piston surfaces have hydrostatic and wear-resistant low-friction pressure surfaces for reduced wear with longer life
DE102007014568A1 (en) * 2007-03-27 2008-10-02 Gapcon Gmbh Adjusting device for shoe press roller, has press shoe and supporting device connected with each other over two hinge bars for influencing relative transverse position of press shoe relative to supporting device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19515832C1 (en) * 1995-04-29 1996-05-02 Voith Sulzer Papiermasch Gmbh Hydraulic piston for flexing shoe press on paper:making machine

Also Published As

Publication number Publication date
EP1027490A1 (en) 2000-08-16
WO1999016970A1 (en) 1999-04-08
DE69811707D1 (en) 2003-04-03
SE9703572L (en) 1999-03-31
DE69811707T2 (en) 2003-09-18
SE510550C2 (en) 1999-05-31
SE9703572D0 (en) 1997-09-30

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