EP4474571A2 - Rahmen für eine gewebeeinsetzeinheit in einer faservliesmaschine und gewebeeinsetzeinheit für eine faservliesmaschine - Google Patents

Rahmen für eine gewebeeinsetzeinheit in einer faservliesmaschine und gewebeeinsetzeinheit für eine faservliesmaschine Download PDF

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Publication number
EP4474571A2
EP4474571A2 EP24177575.8A EP24177575A EP4474571A2 EP 4474571 A2 EP4474571 A2 EP 4474571A2 EP 24177575 A EP24177575 A EP 24177575A EP 4474571 A2 EP4474571 A2 EP 4474571A2
Authority
EP
European Patent Office
Prior art keywords
frame
frame according
fiber web
channels
fabric
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.)
Pending
Application number
EP24177575.8A
Other languages
English (en)
French (fr)
Other versions
EP4474571A3 (de
Inventor
Jarmo HÄMÄLÄINEN
Vesa HYPPÖNEN
Samppa J. Salminen
Tuomas SAUKONOJA
Vesa-Matti SUVELA
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
Valmet Technologies 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
Application filed by Valmet Technologies Oy filed Critical Valmet Technologies Oy
Publication of EP4474571A2 publication Critical patent/EP4474571A2/de
Publication of EP4474571A3 publication Critical patent/EP4474571A3/de
Pending 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
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/001—Wire-changing arrangements

Definitions

  • Chinese patent application number CN108221451 discloses a fabric insertion unit, which is a device for changing a fabric in a fiber web machine.
  • the fabric insertion unit includes two oppositely arranged transfer devices including lifting means.
  • the transfer device has a frame having internal channels for fluid equipped in the lifting means.
  • the channels are formed of several bores from several directions. Also puncture holes are needed.
  • puncture holes are needed.
  • several orifices are used. Each orifice is installed deep in the channel.
  • the orifices need special and accurate bores.
  • the casting may include pores, which may lead to leakages and pressure losses.
  • other machining of the cast frame is hard and time consuming due the said pores and carbides. If any of bores become damaged or the frame somehow get hurt, the whole frame has to be changed.
  • the object of the invention is to provide a new frame for a fabric insertion unit in a fiber web machine, which frame is more durable than before, and also easier and quicker to manufacture and maintain.
  • the characteristic features of the frame according to the invention are stated in the accompanying Claim 1. With new constructions, less bores are needed, and they are easier to drill than before. Also, the installation of the orifices is easy, and the orifices are quick to maintain.
  • Another object of the invention is to provide a new fabric insertion unit in a fiber web machine which is more reliable and easier to maintain than before.
  • the characteristic features of the fabric insertion unit according to the invention are stated in the accompanying Claim 14. The leakages of fluid and pressure may be avoided, and the functions of the fabric insertion unit can be easily amended, if needed.
  • Figure 1 shows an example of the press section of a fiber web machine, viewed from the tending side.
  • the press section includes a framework 10, which has several beam structures 11 and 12. The load is supported especially by the vertical beams, which can also be slanted.
  • the press section has two presses 13, each of which has two fabrics 14.
  • the fabrics 14 formed into endless loops are supported by rolls 15. The rolls are supported on the framework 10. From time to time, each fabric must be replaced.
  • Fiber web machine refers to, for example, paper, cardboard and pulp machines and belt calenders with replaceable fabrics. Closed fabric loops include, for example, the wires on the web forming part and the felts and belts on the press section of the fiber web machine.
  • fabric insertion units 16 are arranged in the framework 10 on the tending side.
  • the fabric insertion units will later be referred to more simply as units.
  • the unit is used to change the fabric on a web forming machine and the unit is intended to be installed in the frame 10 of the web forming machine.
  • Figure 1 shows the units 16 in principle.
  • the framework 10 includes spacers 17, which are removed when changing the fabric 14.
  • FIG 2a shows the unit 16 according to the invention detached from the framework of the fiber web machine.
  • the unit 16 includes two oppositely arranged transfer devices 18 for moving the fabric 14.
  • the unit includes lifting means 19 for forming a transfer passage between the transfer devices 18 for the fabric 14.
  • the transfer passage enables the fabric to be taken through the framework of the fiber web machine.
  • each transfer device 18 includes a frame 20 adapted as a part of the lifting means.
  • each frame is attached to the fiber web machine with plurality of bolts 21.
  • the lifting means function by pressurized fluid.
  • the frame 20 has internal channels 22 for fluid equipped in the lifting means 19, as shown in Figure 2b .
  • one or more of the channels 22 is equipped with an orifice 23 ( Figure 3b ) in order to control the flow of fluid.
  • the locking means 24 are loosened. Then, the distance between the transfer devices, more specifically the frames of the transfer device, is increased by using the lifting means. In practice, a sufficient lift is 0,5 - 10 mm. In this case, the frames are separated from each other, so that the intermediate structure 25 can be removed. Thus, the transfer passage is formed between the frames, making it possible to transfer the fabric using transfer devices.
  • the lifting means is arranged as part of the frame of the transfer device. More specifically, the lifting means includes a pressure chamber delimited by a pressure water seal in the frame. The seal has rounded rectangular perimeter, and it delimits the pressure chamber together with a metal belt loop supported by the turning rolls. The turning rolls are attached to the frame and there is a drive in one or more turning rolls.
  • fluid for example water
  • Both frames have the same kind of channels, and the lifting means function equally, as shown in Figure 2a .
  • Figure 2b is shown three channels 22 for pressurized water at the upper frame 20 and one channel 22 for leakage water at the lower frame 20.
  • the first channel ends to the pressure chamber and the second channel ends to a slot 26 for the seal.
  • the pressurized water pushes the seal against the metal belt loop.
  • the third channel ends to another slot 27 for leakage water seal.
  • the fourth channel is situated between the abovementioned slots 26 and 27. A part of the fluid leaks and it flows out from the frame.
  • both frames include four channels mentioned above.
  • each frame 20 has an external block 28 including the orifice 23 and a part of the channel 22.
  • the bores to the frame may be simple and without any threads.
  • the channels can be optimized without thinking the threads and bores.
  • the block itself is small, and it is easy to machine.
  • the material of the block can be selected freely.
  • the block is attached to the frame by four bolts 21.
  • the block 28 is detachable fixed to the frame 20. When the block is detached, it is easy the change each orifice if necessary.
  • Figure 3b shows a cross section of the block 28.
  • the block 28 is arranged as a manifold including one main channel 29 for several channels 22.
  • the block 28 includes one inlet 30 and one outlet 31.
  • the inlet 30 is without a coupling for the pressurized fluid.
  • the flow of fluid in each channel can be controlled independently.
  • Basic structure of the orifices is the same, only the diameter of the center hole 32 varies. The bigger hole, the bigger flow.
  • the surface of the frame 20 can be flat at the area of the channels. This makes the machining of the frame easier. Then there is a seal 34 between the block 28 and the frame 20 for each channel 22.
  • the seal is an O-ring seal.
  • the seal may be a standard seal and each channel is securely sealed.
  • the frame 20 consists of two plate pieces 35 arranged on top of each other.
  • the plate material is cheap, but has uniform quality and it is easy to machine.
  • all the channels 22 are included in one of the plate pieces 35.
  • the channels are in the thicker plate piece.
  • the slots for the seals of the pressure chamber are in the same plate piece.
  • Each plate piece may be machined independently. However, the final machining is done when the plate pieces are fixed to each other.
  • the frame may consist of one, two or more plate pieces.
  • the frame of two plate pieces is shown as an advantageous embodiment.
  • the plate piece 35 is of stainless or acid proof steel. Steel is easy to machine, and the material is firm and corrosion resistant. Also, one or more of the channels may consist of grooves machined on the surfaces of the plate pieces. Thus, even less borings are needed. Also aluminum is a possible material like iron with suitable coating against corrosion. In addition, the plate piece may be a 3D-printed piece. Also composites with fiber reinforcements may be used.
  • the plate pieces 35 are bolted together with ten bolts.
  • the joint between the plate pieces is depicted with a dashed line in Figure 3a .
  • other fixing methods may be used, for example, welding, interference fitting, riveting, or gluing.
  • the friction between the plate pieces is increased with one or more ways like, for example by using chemicals or coatings in one or more metal pieces.
  • the surfaces may by machined to increase the roughness or even for forming form fittings.
  • friction shims or like may be used and the plate pieces may be manufactured from different materials in the first place. With the increased friction or other structures, the sliding between the plate pieces can be diminished or even prevented. In this way, the plate pieces will not flex as much. Thus, smaller, or fewer bolts are needed.
  • Figure 3b shows two keys 36 arrange in the joint between the plate pieces prevention the sliding between the plate pieces. More generally, between the plate pieces 35 there is one or more keys 36. Advantageously, one or more of the keys 36 is orientated parallel to the interface between the plate pieces 35. Thus, the strength of the key can be utilized. Interchangeably to the shown rectangular keys in sideway, one or more round pins 37 may be used.

Landscapes

  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Nonwoven Fabrics (AREA)
EP24177575.8A 2023-06-07 2024-05-23 Rahmen für eine gewebeeinsetzeinheit in einer faservliesmaschine und gewebeeinsetzeinheit für eine faservliesmaschine Pending EP4474571A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI20235632A FI131043B1 (en) 2023-06-07 2023-06-07 Frame for a fabric feeding unit in a fiber web machine and fabric feeding unit for a fiber web machine

Publications (2)

Publication Number Publication Date
EP4474571A2 true EP4474571A2 (de) 2024-12-11
EP4474571A3 EP4474571A3 (de) 2024-12-25

Family

ID=91248793

Family Applications (1)

Application Number Title Priority Date Filing Date
EP24177575.8A Pending EP4474571A3 (de) 2023-06-07 2024-05-23 Rahmen für eine gewebeeinsetzeinheit in einer faservliesmaschine und gewebeeinsetzeinheit für eine faservliesmaschine

Country Status (3)

Country Link
EP (1) EP4474571A3 (de)
CN (1) CN119102140A (de)
FI (1) FI131043B1 (de)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108221451A (zh) 2016-12-21 2018-06-29 维美德技术有限公司 用于更换幅材成形机中的织物的设备

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI117397B (fi) * 2005-04-05 2006-09-29 Metso Paper Inc Menetelmä ja laite kudoksen vaihtamiseksi paperi- tai kartonkikoneessa
FI20096146A (fi) * 2009-11-05 2011-05-06 Metso Paper Inc Sovitelma kuiturainakoneen rungossa
DE102016211360A1 (de) * 2016-06-24 2017-12-28 Voith Patent Gmbh Vorrichtung und Verfahren zum Wechseln einer Bespannung einer Papiermaschine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108221451A (zh) 2016-12-21 2018-06-29 维美德技术有限公司 用于更换幅材成形机中的织物的设备

Also Published As

Publication number Publication date
FI20235632A1 (en) 2024-08-14
FI131043B1 (en) 2024-08-14
EP4474571A3 (de) 2024-12-25
CN119102140A (zh) 2024-12-10

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