• 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:
    The invention relates to a sealing arrangement, which comprises a seal holder (17) and a seal (18) arranged in the seal holder (17) and detection means (19) arranged to determine the wear amount (26) of the seal (18). The detection means (19) comprise detection material (21) and sensor (22) arranged to detect the detection material (21), one of which is arranged in connection with the seal (18) and another in connection with the seal holder (17). The invention also relates to a suction roller equipped with sealing arrangement.
    公开号:FI20185755A1
    申请号:FI20185755
    申请日:2018-09-11
    公开日:2020-03-12
    发明作者:Rene Graichen；Mikko Kaasalainen；Heikki Kettunen；Antti Kontto；Risto Kovanen；Kaale Nieminen；Markus Nylund；Seppo Parviainen；Tatu Pitkänen；Markku Tuhkala
    申请人:Valmet Technologies Oy；
    IPC主号:
    专利说明:

    GASKET ARRANGEMENT AND GASTRY MACHINE SUCTION ROLLER WITH GASKET ARRANGEMENT
    The invention relates to a seal arrangement comprising a seal holder and a seal fitted to the seal holder and detector means adapted to determine the wear allowance of the seal. The invention further relates to a suction roll of a fibrous web machine provided with a sealing arrangement.
    EP patent 1141481 discloses a seal arrangement whose wear can be monitored. To monitor wear, the seal arrangement includes detector means. As an application of the sealing arrangement, the suction roll of a fibrous web machine with one or more sealing arrangements is shown. The suction roll has a perforated jacket with a suction box inside. The seal arrangement includes a seal holder and a seal fitted to the seal holder. The seal holder is supported in the suction box so that the seal extends to the inner surface of the jacket. The seal arrangement generally also includes loading means for loading the seal. Some of the seal arrangements also include locking means for placing the seal slightly away from the jacket. The seal arrangements delimit the zone where the vacuum effect of the suction box extends through the holes in the jacket to the surface of the jacket.
    The structure of the known detection means is complex, but still the expression is inaccurate. In this case, the information on the wear capacity of the seal is uncertain, which may lead to premature seal replacement or wear of the seal. In addition, the detection means are sensitive to failure and are only suitable for certain types of sealing arrangements.
    The object of the invention is to provide a new type of seal arrangement in which the wear of the seal can be detected even more simply, but more accurately than before. The features of the sealing arrangement according to the present invention appear from the appended claim 1. It is a further object of the invention to provide a novel suction roll of a fibrous web machine with a sealing arrangement, the wear of the seals of which is known at all times. The features of the suction roll according to the invention appear from the appended claim 14. In the sealing arrangement according to the invention, the detection means are of a new type and are arranged in a new and surprising manner. With durable and simple components, precise expression is achieved, so that the expected service life of the seal can be easily determined. In this case, the replacement of the seal can be planned in advance, whereby premature replacements and, on the other hand, wear and tear can be avoided. At the same time, useful information is obtained about the operation of the suction roll.
    The invention will now be described in detail with reference to the accompanying drawings, which illustrate some embodiments of the invention, in which:
    20185755 prh 11 -09- 2018
    Figure 1 shows the press position of a fibrous web machine in which the suction roll according to the invention is arranged,
    Figure 2 shows a cross-section of a suction roll according to the invention,
    Figure 3a shows one embodiment of a sealing arrangement according to the invention,
    Figure 3b shows another embodiment of a sealing arrangement according to the invention,
    Figure 4a shows a cross-section of a seal according to the invention,
    Figure 4b shows a part of the seal of Figure 4a.
    Figure 1 shows an example of a fibrous web machine in which the suction roll 10 is in nip contact with the press roll 11. In the nip, water is removed from the fibrous web and transferred to the suction roll
    20185755 prh 11 -09- 2018 casing bores, more generally on the open surface of the suction roll. The water transfer is enhanced by a vacuum effect created by a suction box 12 arranged inside the suction roll. The vacuum is created in the suction box by some suitable device 5, which is generally located outside the suction roll.
    With one or more sealing arrangements, a zone 13 with a vacuum effect can be arranged in the area of the nip or in addition also before the nip. After zone 13, the water leaves the open surface of the suction roll, usually by gravity. The suction10 can also be used from its track hall, such as to guide the fibrous web to follow the desired fabric.
    Figure 2 shows a suction roll 10 of a fibrous web machine with a sealing arrangement. The suction roll 10 comprises a rotatably supported perforated jacket 14 and a suction box 12 fitted inside the suction roll 10. In Figure 2 only a small part of the holes 15 in the jacket 14 is shown. The suction box 12 has at least one sealing arrangement 16 to limit the vacuum effect. Generally, two sealing arrangements are used, between which the aforementioned zone 13 is formed. By using several sealing arrangements, several zones can be delimited. Each seal arrangement includes a seal holder 17 and a seal 18 extending into the housing 14 fitted to the seal holder 17. Here, the seal holder 17 is supported on a suction box 12. Both the seal holder and the seal 25 extend over substantially the entire length of the suction box.
    Separate end seals are used at the ends of the suction box, in which the seal arrangement according to the invention can also be applied (not shown). The seal arrangement also includes detector means 19 adapted to determine the snow clearance of the seal 18. With the aid of the detection means, the wear allowance is known and thus the remaining service life of the seal can always be determined. A sudden change in the wear allowance can also be used to detect possible disturbances. Generally, water is sprayed on the inner surface of the jacket to lubricate the seal. Water reduces
    20185755 prh 11 -09- 2018 friction and thus slows down the wear of the seal. The lubrication jet pipe 20 is shown in Figure 2. In addition, the lubricating water can also be passed along the seal or through the seal.
    In the invention, the detector means 19 comprise a detector material 21 and a sensor 22 adapted to detect the detector material 21, one of which is arranged in connection with the seal 18 and the other in connection with the seal holder 17 (Figures 3a and 3b). The detector material and the sensor form a functional pair whose properties and interaction have been determined and are thus known.
    In this case, regardless of the characteristics of the sealing arrangement and the suction roll in general, the operation of the detector means remains unchanged. Thus, the position of the seal relative to the seal holder is precisely known. During the seal, the position 15 of the seal changes, from which the wear of the seal can then be determined. In practice, the sensor is connected to suitable power supply and signal processing means 23 and is preferably connected to the machine control system 24 of the fibrous web machine (Figure 2). Preferably, a wireless energy and signal transmission ankle is used. Wiring can also be used. In addition, energy can be generated from the rotation of the suction roller, and the battery can withstand the service interval of the suction roller, even more. The machine control system 24 may communicate with the cloud service 25, for example, to provide remote maintenance. The detection means provide continuous information about the state of the seal arrangement and in particular the seal without stopping or opening the suction roller.
    Figures 3a and 3b show in more detail a seal arrangement according to the invention, comprising a seal holder 17 and a seal 18 fitted to the seal holder 17. The seal arrangement also includes detector means 19 adapted to determine the wear margin 26 of the seal 18 (Figure 4a). According to the invention, the detector means 19 comprise a detector material 21 and a sensor 22 adapted to detect the detector material 21, one of which is
    20185755 prh 11 -09- 2018 arranged in connection with the seal 18 and the other in connection with the seal holder 17. The detector material is easy to fit into the gasket arrangement. In addition, the sensor accurately detects the detector material despite the surrounding structures. That is, no unobstructed line of sight or physical contact is required between the detector means and material. Thus, the expression is accurate and the respective wear margin can be determined accurately.
    Preferably, the detector material 21 is arranged in the seal holder 17 with the sensor 22 in the seal 18 (Figure 3a). First, the detector material is easy to attach to the seal holder. Secondly, with the sensor in the seal, other useful information can also be obtained from the seal. Generally speaking, the sensor and the detector material are arranged so close that the sensor can reliably detect the detector material and the mutual movement of the sensor and the detector material can be accurately converted into a seal wear.
    In its simplest form, the sensor 22 is arranged at both ends of the seal 18 and in the middle of the seal 18. In this case, three sensors are used, each with its own detector material. Multiple sensors provide more accurate information than one sensor on the wear at different points in the seal. At the same time, it can be ensured that the seal moves smoothly in the seal holder.
    Accuracy can be further increased by increasing the number of sensors and detector material. In Figure 3b, the detector material is inside the seal 18 with the sensor 22 in the seal holder 17. The next sensor 22 30 located at a different location is illustrated by broken lines.
    One preferred detector material 21 is a permanent magnet 27. The properties of the permanent magnet are stable and the permanent magnet operates without external energy. In addition, a permanent magnet
    20185755 prh 11 -09- 2018 can be accurately detected even in humid conditions. Preferably, the permanent magnet 27 is a circular body that produces the most uniform magnetic field in each direction. Round permanent magnets can also be placed in a row in the direction of movement of the seal. The positioning of the permanent magnets is most convenient by placing them on a strip or strip to be attached to the seal holder. In this case, the distances between the permanent magnets are already positioned. A wide strip or strip can also be used to position the seal in the direction of movement. The detector material may also be an elongate body arranged longitudinally to conform to the direction of movement 28 of the seal 18. With this arrangement, a certain form of magnetic field is formed in the seal holder, the main direction of which is in the direction of movement of the seal. With such methods, the sensor most accurately detects a change in position according to the direction of movement, which improves the accuracy of determining the consumption margin.
    The detector material and especially the permanent magnet can be detected by various sensors. For example, an eddy current sensor is suitable for hot and humid conditions and the detection distance of the eddy current sensor is long. Preferably, however, each sensor consists of a plurality of interconnected HALL sensors. In this case, the movement of the seal can be calculated from the observations of different HALL sensors. In addition to the normal direction of movement, the movement of the seal can also be determined in the machine direction and the axial direction. In this case, for example, the thermal expansion of the seal can be taken into account and thus compensated in the determination. On the other hand, the tilt of the seal can also be observed. Cross-linked HALL sensors achieve an accuracy of tenths of a millimeter. In practice, the wear of the seal is a few tens of millimeters. The sensor in Figure 3b is crosslinked with four HALL sensors.
    20185755 prh 11 -09- 2018
    The permanent magnet and the HALL sensor are simple and compact components that are easy to place in the seal arrangement. When manufacturing the seal arrangement, after installing the components on the electronics, the positions of the seal 5 are determined both new and worn. In this case, the position of the seal can be determined by the detection devices throughout the service life and thus the wear allowance, i.e. the remaining service life, can be determined. When replacing the seal, the characteristics of the seal arrangement must be determined in order to achieve the required accuracy. In this case, the system is directly informed about the type of seal and sensors in question. At the same time, the installation of incorrect seals on the suction roller can be avoided.
    For example, the permanent magnet 27 can be glued to a seal holder 17 made of fiber-reinforced plastic composite (Figure 3a).
    Correspondingly, the sensor 22 can be embedded in the base material of the seal 18 when the seal is cast (Figure 3b). In the embodiment of Figure 4a, the seal 18 comprises a seal body 30 and a wear part 31, 20 removably attached to the seal body 30, the sensor 22 being located between the seal body 30 and the wear part 31. More specifically, the sensor 22 is located on the surface of the seal body 30, which is advantageous especially in temperature sensing. In this case, the wear part can be replaced while the sensor remains attached to the seal body. At the same time, the sensor 25 is brought as close as possible to the point of contact between the seal and the jacket. In the embodiment shown, the seal body 30 has a groove 32 in which the sensor can be mounted and finally watertight, for example by filling the groove with epoxy. Figure 4a also shows two alternative locations 30 for the sensors in the seal body 30. Of these locations, the one below the seal body 30 is best protected when replacing the wear part. Between the seal holder and the seal body there are also loading means for pressing the seal on the inner surface of the casing. The seal holder may also have locking means,
    20185755 prh 11 -09- 2018 with which the seal is slightly detached from the surface of the jacket. A small gap reduces friction and noise without compromising the sealing ability of the seal.
    In the embodiment of Figure 4b, a plurality of sensors 22 are arranged in a continuous strip 33 extending substantially the entire length of the seal 18. The solid strip also has the necessary wires for the sensors. Such a strip is thin and easy to fit into the seal. At the same time, separate 10 wires are avoided. In addition, the tape is flexible. In the figure, a part of the strip 33 is shown raised and enlarged from the groove 32. The individual components are almost microscopic. Film semiconductors can also be used.
    In addition to HALL sensors, other sensors can be included in the detector means. Sensor 22 may include an adhesion sensor
    34. In this case, the vibration of the seal can be detected, which may be due, for example, to the shedding of the jacket. Throwing may be due to local wear or future bearing damage. On the other hand, the sensor 22 may include a pressure sensor 35. In this case, a force can be determined by which the seal is pressed onto the surface of the jacket. Conversely, the observation can then be used to adjust the load elements. The pressure sensors also provide a pressure profile from which, for example, a uniform load on the seal along the entire length of the suction roll can be determined. Furthermore, the sensor 22 may include a temperature sensor 36. In this case, the temperature of the seal can be determined and thus, for example, lubrication jets can be adjusted. In practice, as the temperature of the seal rises, lubrication jets can be added to cool the seal. When the temperature returns to normal, lubrication can be reduced to reduce water consumption.
    The sealing arrangement according to the invention can easily be adapted to various applications. The components used so9 are suitable for hot and humid conditions. In addition, the determination accuracy achieved by the detection means is good. By using a certain type of seal, it is sufficient to replace only the consumable part, while the sensors and the free material remain unchanged. In this case, make sure that the correct wear part is installed in the seal arrangement.
    权利要求:
    Claims (14)
    [1]
    20185755 prh 11 -09- 2018
    A sealing arrangement comprising a seal holder (17) and a seal (18) fitted to the seal holder (17) and detector means (19) adapted to determine the wear allowance (26) of the seal (18), characterized in that the detector means (19) comprise detector material (21) and a sensor (22) adapted to detect the detector material (21), one of which is arranged in the seal (18) and the other in the seal holder (17)
    10 context.
    [2]
    Sealing arrangement according to Claim 1, characterized in that the detector material (21) is arranged in the seal holder (17) with the sensor (22) in the seal.
    15 (18).
    [3]
    Seal arrangement according to Claim 1 or 2, characterized in that the sensor (22) is arranged at both ends of the seal (18) and in the middle of the seal (18).
    [4]
    Seal arrangement according to one of Claims 1 to 3, characterized in that a plurality of sensors (22) are arranged in a continuous strip (33) which extends substantially over the entire length of the seal (18).
    [5]
    Sealing arrangement according to one of Claims 1 to 4, characterized in that the detector material (21) is a permanent magnet (27).
    30
    [6]
    Sealing arrangement according to Claim 5, characterized in that the permanent magnet (27) is an elongate body which is arranged longitudinally in accordance with the direction of movement (28) of the seal (18).
    20185755 prh 11 -09- 2018
    [7]
    Sealing arrangement according to Claim 5, characterized in that the permanent magnet (27) is a circular body and a plurality of permanent magnets (27) are arranged in a row in the seal (18).
    [8]
    Sealing arrangement according to one of Claims 1 to 7, characterized in that each sensor (22) consists of a plurality of HALL sensors cross-linked.
    [9]
    Sealing arrangement according to one of Claims 1 to 8, characterized in that the seal (18) comprises a seal body (30) and a wear part (31) removably attached to the seal body (30), the sensor (22) being arranged in the seal body (30) and the wear part (30). 31) in between.
    Seal arrangement according to Claim 9, characterized in that the sensor (22) is arranged on the surface of the seal body (30) against the wear part (31).
    20
    [10]
    Sealing arrangement according to one of Claims 1 to 10, characterized in that the sensor (22) comprises an adhesion sensor (34).
    [11]
    Gasket 25 arrangement according to one of Claims 1 to 11, characterized in that the sensor (22) comprises a pressure sensor (35).
    [12]
    Sealing arrangement according to one of Claims 1 to 12, characterized in that the sensor (22)
    30 status sensors (36).
    [13]
    A suction roll of a fibrous web machine with a sealing arrangement, the suction roll (10) comprising a rotatably supported perforated jacket (14), a suction box (12) arranged inside the suction roll (10) and at least one sealing arrangement (16) comprising a seal holder (12) in the suction box (12). 17) and a seal (18) extending into the casing (14) arranged in the seal holder (17) and detector means (19) adapted to determine the wear capacity (26) of the seal (18), characterized in that the detector means (19) comprise detector material (21) and detector material ( 21) detecting a sensor (22) arranged, one of which is arranged in connection with the seal (18) and the other in connection with the seal holder (17). 10
    [14]
    Suction roller according to Claim 14, characterized in that the sealing arrangement is a sealing arrangement according to one of Claims 2 to 13.
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    同族专利:
    公开号 | 公开日
    FI128661B|2020-09-30|
    EP3623526A1|2020-03-18|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    SE513395C2|1999-01-07|2000-09-11|Jocell Ab|WEATHER sTRIP|
    DE10297533T5|2001-12-13|2004-11-04|Metso Paper, Inc.|Wear indicator for a seal of a suction roller of a paper or cardboard machine|
    US7144477B2|2003-12-15|2006-12-05|Voith Paper Patent Gmbh|Wear indicator for seal strip in a suction box of a paper machine|
    DE102004059028A1|2004-12-08|2006-06-14|Voith Paper Patent Gmbh|Sealing strip system for suction zone of suction roller, e.g. in a papermaking machine, including wear indicating system based on change in interaction between two sections on reaching specific wear level|
    法律状态:
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    优先权:
    申请号 | 申请日 | 专利标题
    FI20185755A|FI128661B|2018-09-11|2018-09-11|Sealing arrangement and suction roll with a sealing arrangement in a fibre web machine|FI20185755A| FI128661B|2018-09-11|2018-09-11|Sealing arrangement and suction roll with a sealing arrangement in a fibre web machine|
    EP19196106.9A| EP3623526A1|2018-09-11|2019-09-09|Sealing arrangement and suction roll of a fibre web machine, equipped with the sealing arrangement|
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