• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method of webbing in the dryer section of a fibrous web making machine in which the dryer fabric (18) is alternately supported by drying cylinders (16) and diverting rolls (17) to a single pass and one of a diverter roll (17) and two drying cylinders (16) together Vacuum is applied to the dryer fabric (18) and, during web threading, an increased vacuum is created by blowing (24) in the inlet pocket (26) formed by the dryer wire (18) and the guide roll (17), wherein in conjunction with the inlet gusset (26) and the blown air jet (24) against the guide roller (17) a channel (27) is delimited, which is sealed at its edges extending in the machine direction against the guide roller (17).
    公开号:AT14541U1
    申请号:TGM386/2014U
    申请日:2014-11-04
    公开日:2016-01-15
    发明作者:Mikko Hakuli；Veli-Pekka Koljonen；Ville Lyytikäinen
    申请人:Valmet Technologies Inc；
    IPC主号:
    专利说明:

    description
    METHOD AND ARRANGEMENT FOR TRANSFERRING IN THE DRY PART OF A FIBERGLASS MANUFACTURING MACHINE
    The invention relates to a method for web threading in the dryer section of a fiber web-making machine, in which the drying wire is alternately supported with drying cylinders and guide rollers to a Einsiebführung and vakuumbeaufschlagt one of a guide roller and two drying cylinders together with the dryer fabric educated / defined pocket space is made, and in which formed by the dryer fabric and a guide roller Einlaufzwickel when web threading by blowing an increased vacuum is generated. The invention also provides an arrangement for web threading in the dryer section of a fiber web manufacturing machine according to the preamble of claim 1.
    In the dryer section of fiber web manufacturing machines, such as paper or board machines, the so-called Einsiebführung is applied.
    In the Einsiebführung the steam-heated drying cylinder and the guide rollers alternate under supports of the dryer. In the pocket space delimited by the drying cylinders and the deflection roller together with the drying wire, there is also arranged a runny-bility component or a running-property component, with which the pocket space is subjected to vacuum loading. Runnability components are used during production, for example, to prevent the fiber web, also referred to below as the web, from being detached from the deflection roller and the edge parts of the web fluttering. At the beginning of production, the web threading is carried out by means of a web threading strip.
    The fibrous web to be produced under single-feed is located on the deflecting roller on the drying wire. The centrifugal force strives to lift the web from the surface of the dryer fabric. To prevent this, a vacuum-loaded roll, which is also referred to as a VAC roll, is used as deflection roll. In addition, efforts have been made to form an enhanced vacuum adjacent to the VAC roller in the inlet gusset formed by the dryer wire and the idler roller. In the known solutions, the vacuum, especially as regards the leader strip, has been inadequate. In other words, despite the vacuum loading of the inlet gusset and despite the VAC roller, the threading strip on the deflecting roller lifts off from the surface of the drying wire so that web threading fails. Thus, the speed of operation of the fiber web manufacturing machine had to be limited during production and especially during the web run. In addition, air is supplied to the inlet gusset by the bladder, whereby the function of the runnability component is impaired, especially during web threading. As a result, machine renewal at the transition to ropeless webbing has required large sums for VAC rolls and runnability components. Nevertheless, in practice, tobogganing is still a critical phase and a rather uncertain thing.
    With the present invention, a novel method and a novel arrangement is now to Bahnaufführen in the dryer section of a fiber web manufacturing machine to be created that are more reliable than the previous and allow a reliable Bahnaufführen. The characterizing features of the method according to the invention are that in connection with the inlet gusset and the bubbles against the guide roller, a channel is delimited, which is sealed at its facing in the machine direction edges against the guide roller. Accordingly, the characteristic features of the arrangement according to the invention that it has a arranged in the inlet gusset, a flow area comprehensive channel in which the blowing means are arranged, and the machine direction facing sealing elements for edge sealing of the channel against the guide roller has. The sealing elements consist of compared to their length narrower strips that run machine in the machine direction of the fiber web manufacturing machine substantially. Thanks to the channel now an increased vacuum is generated, which extends deeper than before in the inlet gusset in, so that now the Aufführstreifen reliably follows the dryer fabric and adheres to the surface. Reinforced vacuum is needed only for a short time, so that the power consumption remains moderate. Also, thanks to the channel, only a small amount of blowing air is needed. This also reduces the amount of air entering the pocket space, so that the function of the runnability component remains undisturbed.
    In the following the invention with reference to the accompanying drawings, in which some embodiments of the invention are shown, described in detail. FIG. 1 is a side view of a fibrous web forming machine; FIG. Fig. 2a equipped with runnability components single drying group of
    Drying section of a fiber web manufacturing machine as a principle drawing; 2b shows the arrangement according to the invention during Bahnaufführens. Fig. 3a is a partial enlargement of Fig. 2b; Fig. 3b as a schematic drawing of the main components of the invention Anord statement.
    Fig. 1 shows a per se known fiber web-making machine 10 viewed laterally. The machine 10 comprises as subpopulated units one behind the other a wire section 11, a press section 12, a dryer section 13 and an equipment section 14. The equipment section comprises in the fiber web manufacturing machine shown in Fig. 1 only one reel. The drying section 13 is composed of a plurality of successively arranged drying groups 15, nine in number in the machine 10 shown in Fig. 1, together.
    Fig. 2a shows a single dryer group 15, of which, as stated in the dryer section of the fiber web manufacturing machine are arranged several behind the other. The drying group is composed of drying cylinders 16 and guide rollers 17, over which the drying wire 18 runs in an endless loop. Nowadays, the Einsiebführung described here is increasingly being used, which has only one drying wire per dryer group. In practice, the web runs between the drying wire and the heated drying cylinder. At the guide roller in turn the web runs on the drying wire. In order to keep the web under control, a runnability component 19 is additionally used, which is arranged in the pocket space 20 formed by successive drying cylinders and a deflection roller. In Fig. 2a of the runnability components are shown only hatched shown end plates, with which the air currents are kept at the edge portions of the web under control. Further, in Fig. 2a, the mere drying wire 18 is shown without Aufführstreifen.
    In Fig. 2b, a runnability component 19 is shown without face plate. In this case, the runnability component 19 consists of a blow box. The blow box has tuyeres arranged on both the inlet and outlet sides in the transverse direction of the fiber web manufacturing machine. The high vacuum region is defined from the pocket space of normal vacuum by a vacuum divider located near the dryer fabric in the transverse direction of the fibrous web forming machine, and the region is vacuum charged by suction. The illustrated runnability component is intended for use during production, where the web covers the dryer fabric and prevents leaks through the dryer fabric into the runnability component.
    In Fig. 2b are also serving for detaching the Aufführstreifens 22, in which the drying cylinder 16 and the dryer fabric 18 formed Auslaufzwickel 21 arranged blowing means 23 are shown. With these blowing means, the end of the leader strip 22 is detached from the drying cylinder 16 and then follows the dryer wire 18. The blowing means operate during web threading, and in the case shown in Fig. 2b, the end of the threading strip 22 has already passed the illustrated first drying cylinder 16 , Despite these blowing agents, there have been problems with the web threading, especially at the deflection roller and at the group transitions. Above all, the sticking of the leader strip on the dryer fabric in the area of the deflection roll was uncertain.
    The invention thus relates to a process for web threading in the dryer section of a fiber web-making machine. In the dryer section, the drying wire 18 is alternately supported with drying cylinders 16 and guide rollers 17 to a Einsiebführung. In other words, in the drying section, the drying wire 18 is alternately supported with drying cylinders 16 and guide rollers 17 to a Einsiebführung. In addition, the pocket space 20 formed by a deflection roller 17 and two drying cylinders 18 together with the drying wire 18 is subjected to vacuum. For this purpose, a runnability component 19 is arranged in the pocket space 20 defined by a deflecting roller 17 and two drying cylinders 16. During web threading, the inlet gusset 26 formed by the drying wire 18 and the deflecting roller 17 is also subjected to a vacuum boosted by blowing 24 (FIG. 3 a). Thus, so to the arrangement include blowing means 25, which are arranged in the inlet of the drying wire 18 and the guide roller 17 inlet glands 26 and serve to reinforce the vacuum in the inlet gusset 26 when Bahnaufführen. According to the invention, in connection with the inlet gusset 26 and the bladder 24, a channel 27 is delimited against the deflecting roller 17 (FIG. 3b), which is sealed against the deflecting roller 17 at its edges pointing in the machine direction. In other words, according to the invention, the assembly includes a channel 27 disposed in the inlet gland 26 and having a flow surface 28 (Fig. 3b) in which the blowing means 25 are disposed, and the machine direction sealing elements 29 for sealing the channel 27 at its edges has against the guide roller.
    The aforementioned solution offers numerous advantages. Perhaps the most important of these advantages is the considerable vacuum effect very deep in the inlet gusset. To achieve this effect, the channel 27 according to the invention, which is formed against the deflection cylinder 17, helps. From the opposite to the deflection cylinder 17 side of the channel 27 is bounded by the flow surface 28 to which the blast air jet 24 is directed. In this case, a Venturi effect is caused by the bubbles, the air from the inlet gusset tears with it and thus brings a considerable vacuum effect in the beginning of the channel and especially on the front.
    In addition, direct the channel at its edges limiting seals the blowing process and simultaneously prevent escape of the vacuum. This, in turn, increases the vacuum in the inlet gusset. In Fig. 2b, the arrangement containing the channel according to the invention, which is attached to the runnability component 19, shown in principle.
    In Fig. 3a an arrangement according to the invention is shown in more detail. Here, in the direction of rotation of the guide roller 17 on the channel 27 in addition an extension 30 (Fig. 3b) attached, which is open to the drying wire 18. As a result, the vacuum effect extends even deeper into the inlet gusset. In addition, the vacuum effect now extends to the drying wire 18 and through this on the Aufführstreifen 22. Thereby the Aufführstreifen is tightly fixed to the dryer fabric, and at the earliest possible time and immediately before the problematic spot, that is, where the drying wire hits the deflection roller. Since the extension is located so deep in the inlet gusset, the vacuum can now escape in any direction. The Aufführstreifen remains reliably adhere to the surface of the dryer over the entire distance on the guide roller, so that the tracking succeeds with certainty.
    An escape of the vacuum is also prevented by sealing the channel 27 in the machine direction over a section and against the drying wire 18. More specifically, viewed in the direction of rotation of the guide roller at the beginning of the extension 30 a transversely directed sealing surface 31 against the dryer wire 18 is present. In Fig. 3b, the arrangement is shown in more abstract form. Again, in the direction of rotation of the guide roller 17 on the channel 27, an extension 30 is present, which is open to the drying wire 18. In practice, the extension of the edge seals 32 is formed, which can touch both the guide roller as well as the drying wire and do so in practice. In Fig. 3b, the above-mentioned sealing surface 31 can be seen, which extends between the edge seals 32. The sealing surface is thus mainly adapted to the transverse direction of the fibrous web making machine, but also has a dimension in the longitudinal direction of the fibrous web forming machine. In Fig. 3b, the edge seal 32 is shown in dashed lines and follows in its shape the curvature of the guide roller 17th
    In the illustrated embodiment, the flow surface 28 is formed by a sheet metal construction 33 which is supported on the runnability component 19. Thus, separate support structures are unnecessary, and the flow area can be formed exactly at the desired location. The sheet metal construction is light and requires little mounting space. Also, the sheet material is easy to shape. Preferably, the arrangement containing the sheet metal construction is supported on its one edge, wherein the attachment takes place at the end of the runnability component. This facilitates the fastening and the possible setting. In the illustrated embodiment, the sheet metal construction is curved and dimensioned so that the mutual distance of sheet metal construction and guide roller in the blowing direction increases a little. The edges of the sheet metal construction are also bent upwards. This gives a rigid sheet metal construction, and the edge seals 32 can be attached to the sheet metal construction 33, resulting in a compact and stable construction.
    Since the sheet metal construction and the edge seals form a whole, the sheet metal construction keeps distance to the deflection roller surface. At the same time, the size of the forming channel remains substantially unchanged. The blowing means 25 are here directed / deflected to the guide roller 17 of the sheet metal construction 33 and comprise a blow chamber 34 which extends over the entire width of the channel 27. The blow chamber compensates for the pressurized air and has holes facing the guide roller side 17 of the sheet metal construction 33. Here, the forming blown air jet 24 moves in the channel 27 against the rotational movement of the guide roller 17 along the flow surface 28.
    The compressed air is passed through the pointing in the machine direction compensating pipe socket 35 (dot-dash line) in the blast chamber 34. The equalizing pipe stub 35 is connected to a larger compressed air pipe stub 36, which in turn is connected to the compressed air system of the fiber web manufacturing machine. Thus, the height of the assembly can be kept low and the compressed air pipe socket can be used to support the sheet metal construction and the edge seals. According to FIG. 3 b, the blow chamber 34 is arranged at a distance from the surface of the deflection roller 17. In this case, the blast air jet 24 draws air in the channel 27 with it, and this train extends under the blast chamber 34 through to the above-mentioned extension 30. Since thanks to the seals the access of replacement air is prevented, formed at the said point a considerable vacuum , This is shown in Fig. 3b by circled minus sign. Now, if the Aufführstreifen to run on the guide roller, it is just behind the sealing surface exposed to a strong vacuum effect, which staples the Aufführstreifen firmly to the drying wire. Regardless of the permeability of the dryer fabric, the vacuum is maintained within the dryer fabric and holds the leader firmly in his grip. Thus, the Aufführstreifen so sticking to the deflection roller on the surface of the dryer fabric and does not dissolve from this until the next inlet gusset or to the transfer devices of the following group transition, so that the Bahnauffüh-ren succeeds.
    Fig. 3a shows the blast air jet 24, which finally leaves the channel 27 to the runnability component 19 out. Here, viewed in the direction of rotation of the guide roller 17 in front of the channel 27 also a scraper 37 is arranged, which prevents the located on the surface of the guide roller 17 boundary layer air enters the inlet pocket 26. At the same time this scraper 37 directs the blast air jet away from the inlet gusset (second arrow 38). The scraper thus prevents the boundary layer air moving on the surface of the deflection roller from entering the channel, so that the blown air jet in the channel remains undisturbed and the vacuum effect can be generated with a small amount of air. This in turn reduces the susceptibility of the runnability component. In front of the scraper blade, air guiding elements can be arranged, which control the flow emerging from the channel after the scraper blade
    Side distract, if in this position no scraper bypassing flow path exists.
    The vacuum effect generated by the arrangement according to the invention is so considerable that the ropeless Bahnaufführen succeeds, even if the guide roller is formed as a smooth or even as a suction-free roller. Thus, it is possible to proceed to ropeless web threading without having to invest in expensive grooved rolls or VAC rolls. But also in conjunction with VAC rollers can be secured with the arrangement easily a successful Bahnaufführen and the Bahnaufführgeschwindigkeit be increased.
    According to the invention, the reinforced vacuum is generated by blowing. The blowing process is easy to control, and the required components require little installation space. In addition, it has been observed that a considerable vacuum can be achieved with surprisingly low overpressure and low flow, due in part to the low and peripherally sealed channel.
    In practice, the distance of the flow surface of the channel from the surface of the guide roller, for example, 5-15 mm. The compensation chamber is even closer to the guide roller. Although it is prevented that the boundary layer air enters the inlet gusset, the blowing is set so that the blowing speed is greater than the peripheral speed of the counter-rotating deflecting roller. Thus, the blast air can escape from the channel, whereby it comes to Venturi effect. In the invention, the blast air jet 24 is formed with compressed air having a pressure of 10-60 kPa, preferably 10-30 kPa. So you can achieve a considerable vacuum with a surprisingly low pressure level. At the same time, the air consumption is only a few tens of liters per second, which corresponds to the conventional peeling bubbles. According to measurements, regardless of whether the deflection roller rotates or the guide strip is located at the channel, a vacuum of 500-6000 Pa is achieved. The arrangement thus works under all conditions. For example, with a blown air jet of 30 kPa, a vacuum of approx. 3000 Pa was achieved in a static situation without a leader strip and a vacuum of approx. 4600 Pa with tailing strips. With the same 30 kPa blown air jet, a vacuum of about 2200 Pa was achieved while driving the drying group in crawlspace and at a line speed of about 675 m / min a vacuum of about 1800 Pa (without threading strip). Thus, the achieved vacuum levels are up to ten times higher than in the prior art. In addition, test measurements have shown that the coverage of the tread bar hardly increases the forming vacuum. In practice, so little air succeeds in penetrating the dryer fabric that its effect on the vacuum can be neglected. By blowing so a considerable vacuum effect is achieved, which takes the Aufführstreifen immediately under control. Also, the rotation of the guide roller has little effect on the forming vacuum, since it is prevented that the boundary layer air flows into the inlet gusset. Thus, with the arrangement according to the invention, a vacuum that is considerably greater than previously has been produced considerably lower in the inlet gusset than previously, so that reliable web threading is ensured under all conditions.
    The width of the channel may be, for example 400-500 mm, the length of the edge seals about 200 mm and its thickness about 10 mm. The reinforced vacuum zone is about 30 mm long, and the distance of the rounded ends of the edge seals from the contact point between the dryer wire and guide roller is less than 200 mm.
    After the web threading the blowing function can be turned off, but the channel including its seals remains. During web threading, the strong vacuum pulls the dryer fabric against the edge seals, which simultaneously grind over the idler surface. Thus, Teflon-based or Teflon-coated seals are preferably used which are wear-resistant without wearing down the dryer fabric. After removal of the vacuum, the load decreases and the dryer fabric detaches itself from the edge seals. At the same time, the load on the guide roller decreases. Thus, the edge seals remain intact for a long time, and even the dryer fabric undergoes no wear even when the channel is firmly mounted to the runnability component. The blowing function is preferably used only when needed.
    For example, at the beginning of Bahnaufführens air is directed, for example, only in the first two drying groups. For the time being, no additional vacuum is required in the other dryer groups because the end of the strip is only at startup. As the leader strip advances, new dryer groups are loaded and, accordingly, the blowing function is turned off where the leader strip already covers the dryer wire.
    With the method according to the invention and the arrangement according to the invention a reliable web threading is achieved in Einsiebführung even over a suction-free and smooth guide roller. Even with a small amount of air a significant vacuum is effected, which also extends optimally deep into the inlet gusset. Also surprising is the "storage" of the vacuum in the drying wire, wherein the Aufführstreifen is held securely on the surface of the drying wire despite the centrifugal forces.
    权利要求:
    Claims (12)
    [1]
    Claims 1. A method of webbing in the dryer section of a fibrous web making machine in which the dryer fabric (18) is alternately supported by drying cylinders (16) and diverting rolls (17) to a single pass and one by a diverter roll (17) and two drying cylinders (16) vacuum is formed together with the dryer fabric (18) formed pocket space (20), and in the web threading in the inlet from the dryer fabric (18) and the guide roller (17) formed inlet pocket (26) by blowing (24) an amplified vacuum is generated, characterized in that in connection with the inlet gusset (26) and the blown air jet (24) against the guide roller (17) a channel (27) is delimited, which is sealed at its extending in the machine direction edges against the guide roller (17) ,
    [2]
    2. The method according to claim 1, characterized in that in the direction of rotation of the guide roller (17) on the channel (27) an extension (30) is arranged, which is designed to dry wire (18) open towards.
    [3]
    3. The method according to claim 1 or 2, characterized in that in the machine direction of the channel (27) is sealed over a partial distance also against the drying wire (18).
    [4]
    4. The method according to any one of claims 1 to 3, characterized in that the blown air jet is formed with compressed air whose pressure is 10-60 kPa, preferably 10-30 kPa.
    [5]
    5. arrangement in the web threading in the dryer section of a fiber web manufacturing machine in which the drying wire (18) is alternately supported with drying cylinders (16) and guide rollers (17) to a Einsiebführung and in which of a guide roller (17) and two drying cylinders (16) together with the dryer fabric (18) formed pocket space (20) a runnability component for vacuum loading of the pocket space (20) is arranged, the arrangement comprises blowing means (25) which are adapted to that of the drying wire (18). and the deflecting roller (17) formed in the Auflaufzwickel (26) during Bahnaufführen an enhanced vacuum, characterized in that the arrangement comprises a in the inlet pocket (26) arranged, a flow surface (28) comprising channel (27) in which the blowing means (25) are arranged and the facing in the machine direction sealing elements (29) for marginal sealing of the channel (27) on the guide roller (17).
    [6]
    6. Arrangement according to claim 5, characterized in that the channel (27) in the direction of rotation of the guide roller (17) has an extension (30) which is open to the drying wire (18).
    [7]
    7. Arrangement according to claim 6, characterized in that viewed in the direction of rotation of the guide roller (17) at the beginning of the extension (30) a transversely directed sealing surface (31) against the drying wire (18) is arranged.
    [8]
    An assembly according to any one of claims 5 to 7, characterized in that the flow surface (28) is formed of a sheet metal construction (33) which is supported on the runnability component (19).
    [9]
    9. Arrangement according to claim 8, characterized in that the blowing means (25) are adapted to open the deflecting roller (17) facing side of the sheet metal construction (33) out.
    [10]
    10. An arrangement according to any one of claims 5 to 9, characterized in that viewed in the direction of rotation of the guide roller (17) in front of the channel (27) a scraper (37) for preventing the entry of located on the surface of the guide roller boundary layer air in the inlet gusset (17). 26) is arranged.
    [11]
    11. Arrangement according to any one of claims 5 to 10, characterized in that the deflection roller (17) is designed as a smooth roller.
    [12]
    12. Arrangement according to any one of claims 5 to 11, characterized in that the deflection roller (17) is designed as a suction-free roller. For this 3 sheets of drawings
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    同族专利:
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    AT394870B|1989-11-10|1992-07-10|Andritz Ag Maschf|DRYING DEVICE|
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    DE202008018166U1|2008-09-05|2011-11-16|Voith Patent Gmbh|drying section|
    WO2010084241A1|2009-01-20|2010-07-29|Metso Paper, Inc.|Method and arrangement for facilitating web threading in a paper machine's drying section|
    CN104964541B|2015-07-10|2017-03-15|四川创越炭材料有限公司|A kind of quickly drying method of viscose base felt|
    FI11272U1|2016-05-04|2016-06-06|Valmet Technologies Oy|Arrangement for bank control in a drying section of a fiber web machine|
    FI129278B|2018-05-24|2021-11-15|Valmet Technologies Oy|Grooved and perforated reverse roll for a fibre web machine|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FI20136095A|FI126248B|2013-11-06|2013-11-06|Method and arrangement for head export with the drying section of a fibrous web machine|
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