EP4050154B1 - Einstellanordnung für den gleitkopf eines scheibenrefiners - Google Patents

Einstellanordnung für den gleitkopf eines scheibenrefiners Download PDF

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Publication number
EP4050154B1
EP4050154B1 EP22156132.7A EP22156132A EP4050154B1 EP 4050154 B1 EP4050154 B1 EP 4050154B1 EP 22156132 A EP22156132 A EP 22156132A EP 4050154 B1 EP4050154 B1 EP 4050154B1
Authority
EP
European Patent Office
Prior art keywords
guide rod
disc
refiner
plate
sliding head
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.)
Active
Application number
EP22156132.7A
Other languages
English (en)
French (fr)
Other versions
EP4050154A1 (de
Inventor
Robert Bruce SCHIAVI
Sanjay Yallure
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
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Valmet Technologies Oy
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Publication date
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Publication of EP4050154A1 publication Critical patent/EP4050154A1/de
Application granted granted Critical
Publication of EP4050154B1 publication Critical patent/EP4050154B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/11—Details
    • B02C7/14—Adjusting, applying pressure to, or controlling distance between, discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/02—Crushing or disintegrating by disc mills with coaxial discs
    • B02C7/06—Crushing or disintegrating by disc mills with coaxial discs with horizontal axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/11—Details
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills

Definitions

  • This disclosure relates to disc refiners including a sliding head that supports a nonrotating movable refiner disc.
  • FIG. 1 wherein like numbers refer to similar parts, a conventional double disc refiner 20 is shown.
  • the refiner 20 has a machine frame 22 on which is mounted a rotating assembly 24 having a shaft 26 mounted by bearings 28 to a shaft case 30.
  • the shaft 26 is connected at a first end 32 to a drive motor (not shown).
  • a second end 33 of the shaft 26 passes into a refiner housing 34 through a circular bulkhead at a removable packing box 36.
  • the second shaft end 33 is machined to form a spline 38 to which the hub 40 of a rotor 42 is mounted.
  • the drive side 43 of the refiner housing 34 has a stock inlet 44 which supplies stock to a shroud 46 defining a triangular cross-section passageway between an outer conical shell 48, an inner cylindrical structure 50, and a drive side stationery disc support structure 51.
  • the inner cylindrical structure 50 surrounds the bulkhead 35.
  • the triangular passageway allows stock to enter a stock chamber formed on the inside of the cylindrical structure 50 surrounding the shaft 26.
  • the refiner 20 also includes a first outlet 65 extending upwardly for evacuation of refined pulp.
  • the stock chamber accommodates four refining members or discs, a drive side, non-moving, stationery disc 60, a drive side rotating disc 62, movable stationery disc 64 and a door side rotating disc 66.
  • the discs have identical outer diameters. In other embodiments (not shown), only two discs can be used. In still other embodiments (not shown), additional disc sets can be used.
  • the refining members may constitute cones or other types of refining members.
  • the movable stationary disc 64 is mounted on a sliding head 68.
  • the sliding head 68 is mounted for translation toward and away from the rotor 42.
  • the sliding head 68 is mounted by a bearing ring 72 to a removable door 70 which forms part of the refiner housing 34.
  • the sliding head 68 is balanced by a counterweight 74 and driven by a screw jack mechanism 76 which employs a variable frequency drive motor 78.
  • the rotor 42 is mounted on the spline 38 at the end of the shaft 26.
  • the spline transmits rotary power to the rotor but is not affixed to the rotor 42.
  • Sufficient play between the rotor hub 40 and the spline 38 is provided so that the rotor 42 slides along the spline 38, thus positioning the rotor 42 in response to hydrodynamic forces between the stationary disc mounted on a support structure 51 and the stationary disc 64 mounted on the sliding head 68.
  • a very small amount of tilting of the rotor with respect to the axis of the shaft 26 is also accommodated by the spline hub mount.
  • the sliding head 68 supports the door side stationery disc 64 on a support structure 80.
  • This support structure allows stock to flow behind about thirty percent of the outer circumference of the support 80 which represents approximately fifty percent of the area of the refiner disc 64. Further, the stock which supports the outer thirty percent of the support 80 is at a higher pressure than the stock which flows through the shroud 46, due to the pumping action of the rotor 42.
  • the hydraulic support of the support structure 80 thus supports the most highly loaded portion of the disc because the fluid pressure increases radially as the fluid is pumped by the rotor 42.
  • the support structure 80 has minimal thermal gradients because the disc is either exposed directly to the stock or is remote from the exterior of the refiner 20. Thus, deflections induced by thermal gradients are minimized.
  • the action on the fibers as they pass between the discs requires that the disc be closely spaced, typically between 50,8 ⁇ m and 101,6 ⁇ m (two and four thousandths of an inch) apart. Maintaining this gap uniformly across the entire refiner disc diameter-which may be 137,16cm (fifty-four inches) across or more-has in the past resulted in massive support structures to resist deflections caused by pressures between the refiner disc.
  • the deflection loads on the support structure 80 are reduced, allowing a lighter weight support structure which has lower deflections under load.
  • the increased rigidity of the stationary disc mounting structure 80 combined with the ability of the rotor 42 to align itself with the stationery disc 60, 64 results in greater uniformity of the gap between the rotating refiner disc 62, 64 mounted on the rotor 42 and the stationery disc 60, 64.
  • the gap between the refiner disc typically is 50,8 ⁇ m and 101,6 ⁇ m (two and four thousandths of an inch) and is typically maintained and supported by the physical thickness of the pulp fibers as they pass between the refiner disc. Greater uniformity of this gap produces more uniform refining and reduced wear.
  • a disc refiner comprises a rotating disc connected to and driven by a shaft for rotation within a housing, and a sliding head plate within the housing.
  • the sliding head plate has a front face and a rear face, and a nonrotating movable refiner disc is attached to the front face of the sliding head plate.
  • An actuator is attached to the housing, and a guide rod support plate is within the housing.
  • the guide rod support plate has a plurality of spaced apart guide rod openings.
  • a counterweight is connected to the actuator.
  • the refiner also includes a plurality of spaced apart guide rods, each of which extends through a respective one of the guide rod openings, each guide rod having a first end attached to the rear face of the sliding head plate and a second end attached to the counterweight.
  • An actuator mounting plate is attached to the housing, and a plurality of tie rods attached to and extending between the actuator mounting plate and the guide rod support plate.
  • FIGS. 2 through 7 A new and improved refiner 100 is illustrated in FIGS. 2 through 7 .
  • the refiner 100 includes a housing 104 having portions defining a stock inlet 108 and portions defining a stock outlet 112.
  • a refining chamber 116 is between the stock inlet 108 and the stock outlet 112, and a shaft 120 extends into the housing 104.
  • a rotating disc 124 is connected to and driven by the shaft 120 for rotation within the housing 104.
  • a sliding head plate 130 is within the housing 104, and the sliding head plate 130 has a front face 134 and a rear face 138.
  • a nonrotating movable refiner disc 140 is attached to the front face 134 of the sliding head plate 130.
  • the nonrotating movable refiner disc 140 is adjacent the rotating disc 124 so that a small adjustable refining gap is between the nonrotating movable refiner disc 140 and the rotating disc 124.
  • An actuator 144 is attached to the housing 104 for moving the sliding head plate 130 relative to the rotating disc 124.
  • the refiner 100 improves upon the refiner 20 by including a guide rod support plate 150 within the housing 104, and the guide rod support plate 150 has a plurality of spaced apart guide rod openings. More particularly, in this embodiment, there are only three guide rod openings 152, 154, and 156 (see FIG. 6 ), but in other embodiments (not shown), more openings can be used.
  • the guide rod support plate 150 also acts as an access door to the refining chamber 116.
  • a counterweight 158 is connected to the actuator 144.
  • the counterweight 158 is a circular plate, but in other embodiments, a spoke wheel configuration (not shown) as well as other configurations can be used.
  • the refiner 100 also includes a plurality of spaced apart guide rods 160 (see FIGS. 4 and 6 ), each of which extends through a respective one of the guide rod openings 152, 154 and 156, each guide rod 160 having a first end 162 (see FIG. 4 ) attached to the rear face 138 of the sliding head plate 130 and a second end 164 attached to the counterweight 158.
  • the sliding head plate 130 is on one side of the guide rod support plate 150 and the counterweight 158 is on the other side of the guide rod support plate 150.
  • the three guide rod openings 152, 154, and 156 and three guide rods 160 lay in a circle spaced apart from the center of the guide rod support plate 150 (see FIG. 6 ).
  • the refiner 100 also includes an actuator mounting plate 170 attached to the housing 104 and a plurality of tie rods 180 (see FIGS. 4 and 7 ) attached to and extending between the actuator mounting plate 170 and the guide rod support plate 150.
  • the actuator mounting plate 170 is spaced apart from the guide rod support plate 150, and the counterweight 158 is positioned between the actuator mounting plate 170 and the guide rod support plate 150.
  • six tie rods 180 are spaced apart around the periphery of the actuator mounting plate 170, but with smaller or larger refiners (not shown), less or more tie rods can be used.
  • other structure components such as a cylindrical shell (not shown) attached to and extending between the actuator mounting plate 170 and the guide rod support plate 150 can be used.
  • the space 184 between the actuator mounting plate 170 and the guide rod support plate 150 is an area where there are bearings and sensors (not shown) that require maintenance access.
  • removable covers 190 make it much easier that existing designs which employ a small access window in a casting (not shown). This space 184 and the removable covers 190 also keep dust and debris from a mill from getting into the space 184.
  • the sliding head plate 130 of this disclosure is exposed to fluid pressure on its rear face 138 which helps to counter the fluid pressure applied to the nonrotating movable refiner disc 140.
  • the amount of rear face area exposed to fluid pressure is substantial more than in conventional designs which have only a very large central piston connecting a counterweight to a sliding head plate, such as the conventional refiner shown in FIG. 1 .
  • the greater amount of rear face area exposed to fluid pressure helps to reduce stresses on the sliding head plate 130 and reduce the amount of force needed to move the sliding head plate 130.
  • the conventional refiners needed a large central piston to counteract the forces applied to the sliding head plate.
  • the plurality of spaced apart guide rods spaced apart from the center of the sliding head plate provides the support needed to counteract the forces seen by the sliding head plate 130.
  • the various major plates of the assembly i.e., door plate, sliding head plate, actuator mounting plate
  • the various major plates of the assembly are held together by means of the guide rods and the tie rods, thereby eliminating all cast components and nearly all weldments.
  • the advantages of this type of construction are that it allows for much easier removal and repair/rebuild of all the components that comprise the assembly. It also provides for a modularity of design in which common components, such as the guide rods and tie-rods, can be used across various refiner sizes. Lastly, it significantly reduces the cost and complexity of the manufacture of sliding head and actuator mechanism as compared to traditional means.
  • a disc refiner comprises a rotating disc connected to and driven by a shaft for rotation within a housing, and a sliding head plate within the housing.
  • the sliding head plate has a front face and a rear face, and a nonrotating movable refiner disc is attached to the front face of the sliding head plate.
  • An actuator is attached to the housing, and a guide rod support plate is within the housing.
  • the guide rod support plate has a plurality of spaced apart guide rod openings.
  • a counterweight is connected to the actuator.
  • the refiner also includes a plurality of spaced apart guide rods, each of which extends through a respective one of the guide rod openings, each guide rod having a first end attached to the rear face of the sliding head plate and a second end attached to the counterweight.
  • An actuator mounting plate is attached to the housing, and a plurality of tie rods attached to and extending between the actuator mounting plate and the guide rod support plate.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Paper (AREA)

Claims (5)

  1. Scheibenrefiner (100), der aufweist:
    ein Gehäuse (104) mit Abschnitten, die einen Materialeinlass (108) definieren, und Abschnitten, die einen Materialauslass (112) definieren,
    eine Refinerkammer (116) zwischen dem Materialeinlass (108) und dem Materialauslass (112),
    eine Welle (120), die sich in das Gehäuse (104) hinein erstreckt,
    eine drehende Scheibe (124), die mit der Welle (120) verbunden ist und von dieser angetrieben wird, um sich innerhalb des Gehäuses (104) zu drehen,
    eine Gleitkopfplatte (130) innerhalb des Gehäuses (104), wobei die Gleitkopfplatte (130) eine Frontfläche (134) und eine Rückfläche (138) hat,
    eine nichtdrehende bewegliche Refinerscheibe (140), die an der Gleitfläche (134) der Gleitkopfplatte (130) angebracht ist, wobei die nichtdrehende bewegliche Refinerscheibe (140) zu der drehenden Scheibe (124) benachbart ist, so dass sich ein kleiner einstellbarer Refinerspalt zwischen der nichtdrehenden beweglichen Refinerscheibe (140) und der drehenden Scheibe befindet,
    ein am Gehäuse (104) angebrachter Aktuator (144) zum Bewegen der Gleitkopfplatte (130) relativ zu der drehenden Scheibe (124),
    eine Führungsstangenstützplatte (150) innerhalb des Gehäuses (104), wobei die Führungsstangenstützplatte (150) eine Mehrzahl von beabstandeten Führungsstangenöffnungen (152, 154, 156) hat,
    ein Ausgleichsgewicht (158), das mit dem Aktuator (144) verbunden ist,
    eine Mehrzahl von beabstandeten Führungsstangen (160), von denen sich jede durch eine jeweilige der Führungsstangenöffnungen (152, 154, 156) erstreckt, wobei
    jede Führungsstange (160) ein erstes Ende (162), das an der Rückfläche (138) der Gleitkopfplatte (130) angebracht ist, und ein zweites Ende (164) hat, das an dem Ausgleichsgewicht (158) angebracht ist, wobei sich die Gleitkopfplatte (130) auf einer Seite der Führungsstangenstützplatte (150) und das Ausgleichsgewicht (158) auf der anderen Seite der Führungsstangenstützplatte (150) befindet,
    eine Aktuatormontageplatte (170), die an dem Gehäuse (104) angebracht ist, und
    ein Strukturbauteil, das an der Aktuatormontageplatte (170) und der Führungsstangenstützplatte (150) angebracht ist und sich zwischen diesen erstreckt, wobei die Aktuatormontageplatte (170) von der Führungsstangenstützplatte (150) beabstandet ist, wobei das Ausgleichsgewicht (158) zwischen der Aktuatormontageplatte (170) und der Führungsstangenstützplatte (150) positioniert ist.
  2. Scheibenrefiner nach Anspruch 1, wobei mindestens drei Führungsstangenöffnungen (152, 154, 156) und mindestens drei Führungsstangen (160) vorhanden sind, die in einem Kreis liegen, der vom Zentrum der Führungsstangenstützplatte (150) beabstandet ist.
  3. Scheibenrefiner nach Anspruch 2, wobei nur drei Führungsstangenöffnungen (152, 154, 156) und drei Führungsstangen (160) vorhanden sind, die in einem Kreis liegen, der vom Zentrum der Führungsstangenstützplatte (150) beabstandet ist.
  4. Scheibenrefiner nach Anspruch 1, wobei das Ausgleichsgewicht (158) eine kreisförmige Platte ist.
  5. Scheibenrefiner nach Anspruch 1, wobei das Strukturbauteil eine Mehrzahl von Verbindungsstangen (180) aufweist, die an der Aktuatormontageplatte (170) und der Führungsstangenstützplatte (150) angebracht sind und sich zwischen diesen erstrecken.
EP22156132.7A 2021-02-27 2022-02-10 Einstellanordnung für den gleitkopf eines scheibenrefiners Active EP4050154B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US202163154701P 2021-02-27 2021-02-27

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EP4050154A1 EP4050154A1 (de) 2022-08-31
EP4050154B1 true EP4050154B1 (de) 2023-08-16

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CN (1) CN114950638B (de)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4093130A (en) * 1977-03-24 1978-06-06 Koppers Company, Inc. Twin refiner apparatus
US6053440A (en) * 1999-03-02 2000-04-25 Beloit Technologies, Inc. Tangential discharge disk refiner
EP1631391B1 (de) * 2003-06-09 2011-01-05 Kadant Black Clawson Inc. Refinerstatorplattensystem mit selbstausrichtung und aktiver kompensierung
SE528741C2 (sv) * 2005-06-20 2007-02-06 Metso Paper Inc Malapparat av skivtyp
US7726596B2 (en) * 2007-05-03 2010-06-01 Andritz Inc. Refiner with spiral inlet and dual tangential discharge outlet
CN104532636B (zh) * 2014-12-31 2017-04-12 南京林业大学 一种热磨机研磨装置

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EP4050154A1 (de) 2022-08-31
CN114950638A (zh) 2022-08-30
CN114950638B (zh) 2026-03-13

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