EP0521966A1 - Hydraulic supporting device. - Google Patents
Hydraulic supporting device.Info
- Publication number
- EP0521966A1 EP0521966A1 EP91906663A EP91906663A EP0521966A1 EP 0521966 A1 EP0521966 A1 EP 0521966A1 EP 91906663 A EP91906663 A EP 91906663A EP 91906663 A EP91906663 A EP 91906663A EP 0521966 A1 EP0521966 A1 EP 0521966A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- bar
- bars
- contact surface
- support device
- 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
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/02—Head boxes of Fourdrinier machines
- D21F1/028—Details of the nozzle section
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/02—Head boxes of Fourdrinier machines
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/48—Suction apparatus
- D21F1/483—Drainage foils and bars
Definitions
- the invention relates to a pressure medium support device for supporting a first beam on a second beam extending parallel thereto, in particular with the features specified in the preamble of claim 1.
- One of the two bars is part of a flow guide wall, for example a headbox of a paper machine.
- the purpose of the pressure medium support device is to keep the current guiding wall free of deflection.
- the pressure of the flow medium (namely the fiber suspension) is transferred from the flow guide wall to the other bar via the pressure pad.
- One of the two bars is a movable bar for the flexible support of a sieve belt in operation Area of the twin wire zone of a paper machine; it can be moved or swiveled relative to the other bar.
- the pressure medium support device acts as a flexible lifting device.
- a change in the pressure pad pressure thus causes, for example, a change in the distance between the two bars and a change in the force with which the bar is pressed onto the screen belt. See for example WO 89/02499.
- the invention is based on the object of further developing the pressure medium support device described at the outset in such a way that the support force generated by the pressure cushion does not change or at least only changes slightly if the distance between the two beams is less than the length of the beam is different (for example as a result of deflection of one of the two beams) or if the distance between the two beams changes during operation for other reasons.
- the invention ensures that - at least on one of the two bars - the pressure pad exerts a supporting force which is at least approximately constant over the length of the bar under all occurring operating conditions. This is achieved in that, seen in cross section, there is a free space on both sides of the contact surface, the width of which is smaller than the total width of the pressure pad, into which a loop of the pressure pad extends.
- the supporting force is now composed of the pure compressive force, which depends on the internal pressure and the width of the contact area, and tension forces resulting from the internal pressure in the loops. If the distance between the two bars changes while the internal pressure remains the same, the width of the contact area remains at least approximately the same; in addition, the clamping forces mentioned change very little or (in particularly favorable cases) not at all.
- FIG. 1 shows a longitudinal section (along the line II of FIG. IB) through the headbox of a paper machine with a pressure medium support device provided between two bars.
- FIG. 1A is a section from FIG. 2 with an enlarged distance between the bars (section along line A-A of FIG. IB).
- FIG. 1B is a partial view in the direction of arrow B in FIG. 1.
- FIG. 2 shows a partial cross section through a strip for the flexible support of a sieve belt in a twin-sieve arrangement.
- FIG. 2A shows the bar of FIG. 2 in a position withdrawn from the sieve belts.
- the headbox shown in FIGS. 1, 1A and IB is used in a known manner for feeding a machine-wide stock suspension jet onto the endless screen belt 9 of a paper making machine.
- the screen belt 9 runs, inter alia, over a breast roller 8 arranged on the headbox and over a screen table 7.
- the headbox has a nozzle-like outlet channel 4 which is delimited by a lower fixed channel wall 22 and by an upper channel wall 25 , 26.
- the upstream part 25 of the upper channel wall is also fixed in the example shown; that is, it is part of the fixed headbox 24.
- the downstream part 26 of the upper channel wall is movable so as to be able to vary the clear width of the outlet gap 23. This flexibility is preferred realized in that the downstream part 26 is fastened to the upstream part 25 by means of a hinge 27.
- a beam namely a so-called channel wall support 16 is placed on its upper side and rigidly connected to it (e.g. by welding).
- the channel wall support 16 is preferably box-shaped; it has a front wall 17, a rear wall 18 and an upper wall 19.
- a further beam namely a likewise box-shaped support beam 31, is arranged above the channel wall beam 16.
- Both carriers 16 and 31 are shown in cross section in FIG. 1; they extend over the entire width of the machine and are only connected at their two ends (i.e. on the driver side and on the drive side of the paper machine) by means of flexible connecting elements 30.
- the support bracket 31 has a pin 33 at each of its two ends.
- a lifting device is connected to this, of which only one spindle 13 and (in FIG. 1) a bearing bracket 28 attached to the housing 24 are indicated schematically.
- a pressure pad 32 is arranged between the channel wall support 16 and the support support 31, preferably in the form of a hose to which a pressure fluid can be applied. It would also be conceivable to use a membrane instead of the hose.
- the pressure prevailing in the pressure pad 32 can be changed (with the aid of control elements, not shown). For example, it can take into account the liquid pressure prevailing in the outlet channel 4 and the weight of the movable channel wall 26 and the channel wall Carrier 16 are dimensioned so that the movable channel wall 26 is completely free of deflection.
- the support bracket 31 is bent a little upward, as can be seen in Fig. IB. It is expedient here to regulate the liquid pressure as a function of a continuous measurement of the deflection of the channel wall support 16 (as is known per se from US Pat. No. 3,994,773 file P 33 02).
- Temperature control channels 38 and 39 are provided within the channel wall support 16.
- the upper wall 19 of the channel wall support 16 is provided on its upper side with a strip 19 '.
- the top of this strip 19 ' forms the so-called contact surface of the channel wall support 16 against which the pressure pad 32 rests.
- the width of the contact surface of the bar 19 ' is smaller than the total width of the pressure pad 32.
- the support beam 31 has a lower wall 42 and side walls 43. The latter extend downward beyond the lower wall 42; there they support the pressure pad 32 laterally.
- the width of the lower wall 42 is thus substantially equal to the total width of the pressure pad.
- FIG. 2 two wire belts 6 and 9 of a twin wire section of a paper machine are indicated symbolically with dash-dotted lines.
- the upper sieve belt 6 slides along the underside of strips 5 arranged rigidly in the machine.
- the lower sieve belt 9 slides over a flexible strip, denoted overall by 50.
- This essentially consists of a ceramic head strip 51 which is fastened on a movable bar 52; the latter is referred to as "movable Trag ⁇ strip 11 mentioned.
- a stationary bar 53 is vorge see hereinafter called" stationary guide bar ".
- the pressure pad 54 is again preferably designed as a hose.
- the movable support bar 52 has in the middle of its inside an approximately rectangular, but rounded projection 52 'in cross section, which corresponds to the bar 19' of FIG. 1.
- a similar projection 53 ' can also be provided on the stationary guide bar 53.
- Each of these projections forms a contact surface against which the pressure pad 54 pressurized abuts.
- each of the two contact areas is in turn smaller than the total width B of the pressure pad 54.
- free spaces 55 are provided on both sides of each contact area, into which the lateral regions of the pressure pad extend to a greater or lesser extent.
- each lateral area of the pressure pad 54 forms a loop that more or less fills the free space 55.
- the pressure pad 54 is depressurized according to FIG. 2A, so that the movable support bar 52 (together with the head bar 51) has moved away from the sieve belts 6 and 9.
- the free spaces 55 include limited by side surfaces 56 of the protrusions 52 'and 53'.
- the distance a can change during operation; it can be larger or smaller than that shown in FIG. 2.
- This can e.g. B. occur when the amount of fiber suspension introduced between the two sieve belts 6 and 9 changes.
- the cushion pressure remaining the same, there is no or only a slight change in the transmitted support force despite the deformation of the pressure cushion. This ensures that the force with which the strip 50 is pressed onto the lower screen belt 9 (and thus the dewatering pressure in the fiber suspension) remains unchanged.
- the pressure pad 54 For lateral guidance of the pressure pad 54, the latter has two longitudinal ribs 57 which engage in corresponding longitudinal grooves in the projections 52, 53. As can be seen, there is no stop which would limit the stroke of the movable bar 50 in the upward direction during operation.
Landscapes
- Paper (AREA)
Abstract
Un dispositif hydraulique de support d'une première poutre (52) sur une deuxième poutre (53) comprend un coussin de pression (54) agencé entre les deux poutres. La pression dans le coussin de pression est variable mais uniforme sur toute la longueur du coussin de pression. Le coussin de pression (54) repose sur une surface de contact de la première poutre (52). La largeur (b) de la surface de contact est inférieure, en section transversale, à la largeur totale (B) du coussin de pression (54). Un espace libre (55), dans lequel une boucle du coussin de pression (54) peut pénétrer, est ménagé de chaque côté de la surface de contact.A hydraulic device for supporting a first beam (52) on a second beam (53) comprises a pressure cushion (54) arranged between the two beams. The pressure in the pressure pad is variable but uniform over the entire length of the pressure pad. The pressure pad (54) rests on a contact surface of the first beam (52). The width (b) of the contact surface is less, in cross section, than the total width (B) of the pressure pad (54). A free space (55), into which a loop of the pressure pad (54) can penetrate, is provided on each side of the contact surface.
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT91906663T ATE100879T1 (en) | 1990-03-26 | 1991-03-22 | PRESSURE SUPPORT DEVICE. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4009628A DE4009628C2 (en) | 1990-03-26 | 1990-03-26 | Pressure medium support device |
DE4009628 | 1990-03-26 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0521966A1 true EP0521966A1 (en) | 1993-01-13 |
EP0521966B1 EP0521966B1 (en) | 1994-01-26 |
Family
ID=6403053
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91906663A Expired - Lifetime EP0521966B1 (en) | 1990-03-26 | 1991-03-22 | Hydraulic supporting device |
Country Status (7)
Country | Link |
---|---|
US (1) | US5328570A (en) |
EP (1) | EP0521966B1 (en) |
JP (1) | JPH05505655A (en) |
CA (1) | CA2079237A1 (en) |
DE (2) | DE4009628C2 (en) |
FI (1) | FI923138A (en) |
WO (1) | WO1991014825A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4019884A1 (en) * | 1990-06-22 | 1992-01-09 | Voith Gmbh J M | PERFORMANCE SUPPLY SUPPORT FOR A SCREENING BELT |
FI95935C (en) * | 1995-03-01 | 1996-04-10 | Valmet Corp | List for a dewatering device in a paper machine |
SE505667C2 (en) * | 1996-01-09 | 1997-09-29 | Btg Kaelle Inventing Ab | Blade holder |
FI3066U1 (en) * | 1996-06-18 | 1997-09-30 | Valmet Corp | Paper machine dehumidifier list |
USD747357S1 (en) * | 2014-04-10 | 2016-01-12 | The Singing Machine Company Inc. | Karaoke machine |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2373770A (en) * | 1942-05-07 | 1945-04-17 | Martin Russell | Press |
US3017930A (en) * | 1959-06-24 | 1962-01-23 | Lodding Engineering Corp | Adjustable supports for fourdrinier screen wires |
US3187850A (en) * | 1963-09-12 | 1965-06-08 | Eaton Mfg Co | Annular motor actuated drum brake mechanism |
GB1345290A (en) * | 1971-12-23 | 1974-01-30 | Dunlop Ltd | Inflatable seals |
DE2409521C3 (en) * | 1974-02-28 | 1979-04-26 | J.M. Voith Gmbh, 7920 Heidenheim | Headbox for paper machines |
US4371175A (en) * | 1981-08-18 | 1983-02-01 | Keene Corporation | Inflatable gasket for radio frequency shielding enclosure |
US4559105A (en) * | 1984-07-05 | 1985-12-17 | Beloit Corporation | Positive lock foil blades |
JPH0611953B2 (en) * | 1985-09-24 | 1994-02-16 | 三菱重工業株式会社 | Formation improvement device of twin wire type paper machine |
DE3614302C2 (en) * | 1985-11-19 | 1996-02-29 | Voith Sulzer Papiermasch Gmbh | Front wall with support on the headbox of a paper machine |
DE3628282A1 (en) * | 1986-08-20 | 1988-02-25 | Voith Gmbh J M | STATIONARY SUPPORT DEVICE |
SE456590B (en) * | 1987-09-07 | 1988-10-17 | Ahlstroem Valmet | DEVICE FOR CONTROL OF VIRUSES IN A PAPER MACHINE OR CARTON MACHINE |
DE3927401C2 (en) * | 1989-08-19 | 1996-02-29 | Voith Gmbh J M | Headbox |
DE4019884A1 (en) * | 1990-06-22 | 1992-01-09 | Voith Gmbh J M | PERFORMANCE SUPPLY SUPPORT FOR A SCREENING BELT |
-
1990
- 1990-03-26 DE DE4009628A patent/DE4009628C2/en not_active Expired - Fee Related
-
1991
- 1991-03-22 EP EP91906663A patent/EP0521966B1/en not_active Expired - Lifetime
- 1991-03-22 WO PCT/EP1991/000558 patent/WO1991014825A1/en active IP Right Grant
- 1991-03-22 US US07/861,847 patent/US5328570A/en not_active Expired - Fee Related
- 1991-03-22 CA CA002079237A patent/CA2079237A1/en not_active Abandoned
- 1991-03-22 JP JP91506792A patent/JPH05505655A/en active Pending
- 1991-03-22 DE DE91906663T patent/DE59100959D1/en not_active Expired - Fee Related
-
1992
- 1992-07-08 FI FI923138A patent/FI923138A/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9114825A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1991014825A1 (en) | 1991-10-03 |
EP0521966B1 (en) | 1994-01-26 |
DE4009628A1 (en) | 1991-10-02 |
FI923138A0 (en) | 1992-07-08 |
DE4009628C2 (en) | 1994-11-03 |
DE59100959D1 (en) | 1994-03-10 |
JPH05505655A (en) | 1993-08-19 |
US5328570A (en) | 1994-07-12 |
FI923138A (en) | 1992-07-08 |
CA2079237A1 (en) | 1991-09-27 |
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