• 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 sorter (1) and a method for the screening of fiber mass. The sorter comprises a body structure (2) and a rotatable screen drum (3) positioned on the inside thereof, the drum surface of which is equipped with openings (8) forming a sorting surface (10) for screening the fiber mass. The sorter further includes a feed chamber (6) and a feed block (7) for the fiber mass for feeding the fiber mass into the sorter, an accept chamber (9) and an accept block (11) for the fiber mass for removing a fiber mass fraction from the sorter passing through the sorting surface (10) and a reject block for removing a fiber mass fraction not passing through the sorting surface from the sorter. Furthermore, the sorter for cleaning the sorting surface on the screen drum comprises at least one static feed opening (15) for a flushing medium for supplying the flushing medium from the accepting chamber or from the direction of the accepting chamber against the screening drum or in the direction of the screening drum.
    公开号:AT510619A2
    申请号:T1631/2011
    申请日:2011-11-04
    公开日:2012-05-15
    发明作者:
    申请人:Metso Paper Inc；
    IPC主号:
    专利说明:

    1 t • * ·· * * * ·· # 33445 / jw
    Sorter and method for the screening of pulp
    Background of the invention
    The invention relates to a sorter for screening fiber mass, the sorter having a body construction, a rotatable sieve drum positioned inside the body structure, the apertured drum surface forming a sorting surface for sifting the pulp, a feed chamber and a feed block associated therewith the pulp mass for feeding the pulp to be sighted into the sorter, an accepting chamber and an accept block associated therewith for the pulp to remove a fiber mass fraction from the sorter that has passed through the sorting surface on the drum, and a reject block for removing one not through the sorting surface comprising the screen drum arriving fiber mass fraction from the sorter.
    The invention furthermore relates to a method for screening a fiber mass, wherein in the method the fiber mass is sighted with a sorter having a body construction and an inner surface of the 2 • * * * * * * 'Φ • Φ • Φ Φ Φ φ The apertured drum surface forms a sorting surface for screening the pulp, and in the process, the pulp mass to be viewed enters a feed chamber in the sorter. *** " is supplied via a feed block for the fiber mass associated therewith, and a fiber wet fraction passed through the sorting surface on the screen drum from an accept chamber in the sorter via an accept block for the fiber mass associated therewith and a fiber mass fraction not passing through the sort surface on the screen drum removed a reject block wi approx.
    A pulp to be used in the manufacture of paper and board is screened in a treatment phase prior to feeding the pulp to a paper or board machine or other suitable device to reduce various contaminants, splinters and others that reduce the quality of a paper or board web to be made Parts can be removed from the pulp. The sighting can also be used to divide the pulp into fractions that differ in their properties. A device to be used for the sifting of the pulp is typically referred to as a sorter or sorter for the pulp. A generally operating sorter type includes a motorized rotatable screen drum having an apertured cylindrical sorting surface for sifting the pulp. The openings located in the sorting surface may be, for example, round or oblong holes or columns formed in the sorting surface. The sorter further comprises a feed chamber and a fiber mass feed block associated therewith for feeding the fiber mass into the sorter and an accept chamber and an associated accept block for the fiber mass for removing one by the sorter surface on the screen drum From the sorter, the fiber mass fraction, that is to say the fiber mass fraction which was found to be in good condition, arrived in order to be used further in the subsequent phases of the production process of the fiber mass. Furthermore, the sorter has a reject block for removing the not passing through the sorting surface on the screen drum
    Fiber mass fraction, that is to say the fiber mass fraction, which was not found to be good at the sighting, and also the removal of contaminants from the sorter.
    A sorter equipped with a rotatable screen drum may also include a stator comprising one or more foil blades for directing the fiber mass flow with respect to the sorting surface. When the screen drum is rotated, the foil blades on the sorting surface on the screen drum cause a suction pressure pulse acting on the fiber mass, which serves to rinse the sorting surface on the screen drum.
    In practice, however, in the sorters as described above, there is a problem of clogging of the sorting surface on the screen drum when the fiber knots and contaminants in the openings of the sorting surface adhere to the screen drum, especially when using fiber materials containing recycled fiber material , As a result, the open surface of the sorting surface on the screen drum becomes smaller and the capacity of the sorter decreases, which in turn means that the 4 33445 / jw
    Open the sorter and remove the screen drum from the sorter to clean the screen drum. This clogging problem of the sorting surface on the screen drum is virtually no lower in sorters equipped with static foil blades, because a flushing flow on the sorting surface on the screen drum, which generates a static pressure impulse caused by the static foil blades, is too weak to be particularly in the Openings of the sorting surface to remain stuck plastic parts from the sorting surface. By changing the profile of the foil wings, it is possible to intensify an effect on the sorting surface acting on the fiber mass in the direction of the accepting chamber, which makes it easier to remove contaminants from the sorting surface, but has the result that the contaminants through the openings in pass through the sorting surface into the accepting chamber and so reduce the quality of the well-massed fiber mass fraction, that is the accept.
    Brief description of the invention
    The object of the invention is thus to develop such a solution, with the clogging of the sorting area in sorters that are equipped with a rotatable screen drum, can be reduced. It is characteristic of a sorter according to the invention that the sorter for cleaning the sorting surface on the sieve drum comprises at least one static feed opening for a rinsing medium for feeding the rinsing medium from the accepting chamber or from the direction of the accepting chamber against the sieve drum or in the direction of the sieve drum. It is characteristic of a method according to the invention that at least at times a flushing medium from the accept chamber or from the direction of the accept chamber against the screen drum or in the direction of the screen drum for cleaning the sorting surface on the screen drum at least over a static feed opening for the flushing medium is supplied.
    To screen the pulp, the sorter comprises a body construction and a rotatable screen drum positioned on the inside of the body structure, the apertured drum surface of which forms a sorting surface for viewing the pulp. The sorter further includes a feed chamber and a feed block for the fiber mass for feeding the fiber mass into the sorter, an accept chamber, and an accept block for the fiber mass for removing a fiber mass fraction passed through the sorter on the screen drum the sorter and a reject block for removing a fiber mass fraction not passing through the sorting surface on the screen drum from the sorter. Furthermore, the sorter for cleaning the sorting surface on the screen drum comprises at least one static feed opening for a flushing medium for supplying the flushing medium from the accept chamber or from the direction of the accepting chamber against the screen drum or in the direction of the screen drum.
    After the solution, the sorting surface on the screen drum can be easily cleaned by the contaminants and fiber nodes adhering to the sorting surface and in its openings during the operation of the sorter. When feeding the
    Rinsing medium from the accepting chamber or from its direction against the sieve drum or in the direction of the sieve drum are stuck to the sorting surface on the sieve drum or in their openings contaminants and fiber knots back into the feed chamber in the sorter, from where this continues in the direction of the reject block in the sorter and get out of the sorter. When supplying the flushing medium from one or more static feed openings for the flushing medium, that is, from a stationary or stationary feed opening for the flushing medium, the flushing medium supply can be carried out in a manner that is simple in terms of its construction, its cost cheap and their reliability is high. The cleaning of the sorting surface and its openings controllably and effectively increases the actual, practically achievable sorting capacity of the sorter, promotes the maintenance and achievement of a uniform sorting result and reduces the rotational resistance of the screen drum, which reduces the amount of energy required for the rotation of the screen drum.
    According to one embodiment, the sorter comprises at least one fractionation block positioned in the accepting chamber and comprising a plurality of feed openings for the flushing medium and at least one flushing medium channel for feeding the flushing medium into the feed openings. The advantage of this embodiment is that by means of a simple construction in the sorter, the feed openings for the flushing medium and the flushing medium channel can be formed for supplying the flushing medium into the feed openings. 33445 / jw
    According to a second embodiment, the acceptance chamber in the sorter comprises at least one stator which has at least one foil wing for guiding the fiber mass flow with respect to the sorting surface on the screen drum, and the foil wing comprises at least one feed opening for the flushing medium for supplying the flushing medium from the accept chamber or from the direction the acceptance chamber against the screen drum or in the direction of the screen drum for cleaning the sorting surface on the screen drum. The advantage of this embodiment is that in a sorter equipped with a rotatable screen drum, in which static foil blades are used, the feed openings for the flushing medium can be positioned in the mentioned foil wings, whereby not necessarily new constructions must be arranged in the sorter.
    Brief description of the figures
    The invention will now be described in more detail in connection with preferred embodiments with reference to the accompanying drawings, wherein
    Fig. 1 schematically shows a sorter viewed from the side and in cross-section,
    FIG. 2 schematically shows a sorter according to FIG. 1 opened from above, FIG.
    3 schematically shows a second sorter viewed from the side and in cross-section,
    • * * · · »• * * · · · · · * * ·» * * »♦ · ·
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    FIG. 4 schematically shows a part of a sorter according to FIG. 3 opened from above, FIG.
    5 schematically shows a third sorter seen from the side and in cross-section,
    6 schematically shows a sorter according to FIG. 5 opened from above, FIG.
    7 schematically shows a detail of a sorter according to FIGS. 5 and 6, seen from above,
    8 schematically shows a detail of an embodiment for arranging a flushing medium supply as seen from above,
    9 shows schematically still a detail of an embodiment for arranging a flushing medium supply seen from above,
    10 schematically shows a fourth sorter viewed from the side and in cross-section,
    11 schematically shows a sorter according to FIG. 10 opened from above, FIG.
    12 shows schematically a detail of a sorter according to FIGS. 10 and 11, seen from above, FIG.
    13 schematically shows a fifth sorter viewed from the side and in cross-section,
    Fig. 14 schematically shows a sorter of Fig. 13 open from above, and
    • «• • 0 33445 / jw
    Fig. 15 schematically shows a detail of a sorter according to Figures 13 and 14 seen from above.
    Detailed description of the invention
    In Fig. 1, a sorter 1 is schematically seen from the side and shown in cross section and in Fig. 2, the sorter open from above 1 of FIG. 1 is shown schematically. The sorter 1 according to FIG. 1 has a body construction 2, in the interior of which a rotating or rotatable screening drum 3 is positioned. The screen drum 3 can be rotated by a motor 4, for example, in a direction schematically shown in Fig. 2 with an arrow Ξ. The coupling between the screen drum 3 and the motor 4 is shown schematically with an arrow K. The rotational speed of the screen drum 3 can be changed, for example, by changing the rotational speed of the motor 4. The rotational speed of the motor 4 can be changed, for example, by a frequency converter 5 coupled to the motor 4, which can control the rotational speed of the motor 4 with a control pulse CM, for example. For the sake of clarity, FIGS. 1 and 2 do not show those supporting structures for the screening drum 3 with which the screening drum 3 can be supported in a body construction 2 for the sorter 1 in such a way that the screening drum 3 can be rotated.
    The inner volume of the sieve drum 3 forms a feed chamber 6 or a feed space 6 in the sorter 1, to which the fiber mass to be supplied to the sorter 1 and to be viewed via 10 ** 10 **
    For example, a feed block 7 associated with the feed chamber 6 may be fed in a manner schematically indicated by an arrow F. As shown in FIG. In the case illustrated in FIG. 1, two alternative ways of feeding the pulp into the feed chamber 6 in the sorter 1 are shown. According to the first alternative, the fiber mass can be fed directly via the feed block 7 situated above the sieve drum 3 into the feed chamber 6 in the upper part of the sorter 1. According to the second alternative, the fiber mass can be fed via the feed block 7 located on the side of the sorter 1 into the feed chamber 6 at the upper part of the sorter 1, whereby the fiber mass can be fed tangentially into the feed chamber 6 formed by the screen drum 3. The feed block 7 can also be positioned in the sorter 1 in a different manner as shown in FIG.
    In the sieve drum 3 openings 8 are provided in the way that present in the fiber mass, of the fiber size ago a certain size having fibers pass through the openings 8 and through the openings 8 in the sieve drum 3 from the feed chamber in the sorter l in the Acceptance chamber 9 and the accept space 9 can reach the sorter 1. In FIGS. 1 and 2, the accept chamber 9 in the sorter 1 is formed by the volume between the screen drum 3 and the body structure 2 for the sorter 1. A drum surface of the screen drum 3 together with openings 8 again forms a sorting surface 10 on the sorter 1. Said openings 8 may, for example, be round or oblong holes or gaps extending in the direction of the axis of the screen drum 3 over the entire length of the sorting surface 10. The portion of the fiber mass that has passed through the sorting surface 10 on the sorter 10, that is, the proportion of the fiber mass that has passed from the supply chamber 6 into the acceptance chamber 9, forms the acceptance in FIG Sorter 1, that is, the fiber mass fraction found to be good in the sighting. The proportion of the fiber mass reaching the acceptance chamber 9 in the sorter 1 can be removed from the sorter 1 in the manner indicated schematically by an arrow A via the acceptance block 11 located in connection with the acceptance chamber 9 in order to continue in the following phases of the production sequence Fiber mass to be used. In the case illustrated in FIG. 1, two alternative ways of removing the fiber mass found to be good from the accept chamber 9 in the sorter 1 are shown. According to the first alternative, the accept can be removed directly from the acceptance chamber 9 in the lower part of the sorter 1 via the acceptance block 11 located below the acceptance chamber 9. According to the second alternative, the acceptance can be removed from the acceptance chamber 1 in the lower part of the sorter 1 via the acceptance block 11 located on the side of the sorter 1. The accept block 11 can also be positioned in the sorter 1 in a different manner as shown in FIG.
    The sorter 1 furthermore has a reject block 12, via which the portion of the fiber mass not fed through the sorting surface 10 into the feed chamber 6 in the sorter 1, that is to say the fiber mass fraction which was not found to be well and the contaminants present in the fiber mass, that is, the reject is removed for further treatment from the sorter 1 in the manner shown schematically by an arrow R. In the case shown in Fig. 1, the reject block 12 is in the lower part of the * * 12 »· ·» · * * * ··· * * 33445 / jw
    Sorter 1 positioned directly below the screen drum 3, but depending on the construction, mode of operation and intended use of the sorter 1, the reject block 12 can also be positioned in the sorter 1 in a different manner. Thus, for example, the recipe block can also be positioned in the upper part of the sorter 1 for removing very light contaminants, such as styrofoam pieces. The common construction and the common operating principle of various types of sorters 1 are known per se to the person skilled in the art and these are not dealt with here in detail.
    The sorter according to FIGS. 1 and 2 further comprises fractionation blocks 13 located substantially in the axial direction of the screen drum 3, positioned in the acceptance chamber 9 and supported in the body construction 2 for the sorter 1. The fractionation blocks 13 can either be placed directly in the body structure 2 for the Sorter 1 or indirectly supported with support members 14, as shown in Figures 1 and 2. The fractionation blocks 13 have supply ports 15 for supplying the purge medium from the accept chamber 9 or from the direction of the acceptance chamber 9 toward or towards the sorting surface 10 on the screen drum 3 for cleaning the sorting surface 10 located on the side of the accept chamber 9 in the screen drum 3 the screen drum 3 of the stuck in the openings 8 in the sorting surface 10 dirt particles and fiber nodes. Since the fractionation blocks 13 are supported either directly or indirectly in the body structure 2 for the sorter 1, the supply openings 15 are thus static, that is to say located or stationary. The feed openings 15 are connected to a flushing medium channel 16 located in the interior of the fractionation blocks 13, over which the flushing medium channel 16 is connected. [0017]
    33445 / jw
    Rinsing medium can be fed into the supply ports 15.
    The flushing medium channel 16 is in turn connected to a flushing medium block 17, which has a pressure source 18, such as a pump to supply the flushing medium with an increased pressure from the feed openings 15 in the fractionation block 13 in the direction of the sorting surface 10 on the screen drum 3. The flow direction of the flushing medium is shown schematically with an arrow FM. The pressure source 18 can be positioned either on the inside or the outside of the sorter 1, but preferably on the outside of the sorter 1, to simplify the construction of the sorter 1. The same pressure source 18 and the flushing medium block 17 can be arranged to supply the flushing medium to each fractionator block 13 present in the sorter 1. In Figs. 1 and 2, the fractionation blocks 13 are positioned in the same direction with the center axis of the screen drum 3, but the fractionation blocks 13 can also be positioned at an oblique position to the center axis of the screen drum 3. In FIGS. 1 and 2, for the sake of clarity, the fractionation blocks 13 are shown substantially larger in construction than the sorter 1, as they really are. In addition, for the sake of clarity, some shape lines of the fractionation blocks 13 have not been shown.
    As flushing medium, for example, water or steam can be used. When using water as a flushing medium, the water can be supplied as a jet 19 with such a high pressure from the supply ports 15 that the water jets 19 penetrate to the side of the feed chamber 6 through the openings 8 in the sorting surface 10 on the screen drum 3 and at the same time in the openings 8 in the sorting surface 10 14th
    «* ··« ··· ··· * ··. Water can be supplied in the form of jets 19 on the side of the accept chamber 9 in the screen drum 3 from the feed openings 15 in the direction of the sorting surface 10 in such a way that the water jets do not extend directly into the openings 8 in the sorting surface 10, but that they cause pressure pulsation on the sorting surface 10 in the fiber mass to be viewed and the fiber nodes and contaminants adhering in the openings 8 in the sorting surface 10 as a result of pressure pulsation from the sorting surface 10 solve. The fiber nodes may also be dissolved either by impingement of the water jets thereon or as a result of the pressure pulsation caused by the water jets, whereby a portion of the fibers adhering to the fiber nodes of a suitable size pass through the openings 8 in the sorting surface 10 and into the accept chamber 9 in the sorter l can get. If the flushing medium consists of steam, a steam implosion can be effected inside the fiber suspension. This causes sudden condensation of steam droplets local pressure surges, in which the forces caused by these forces are directed to the fiber mass and dissolve among other fiber nodes and detach fiber nodes and contaminants from the openings 8 in the sorting surface 10.
    The flushing medium can be fed either continuously or temporarily against or in the direction of the sorting surface 10 on the screen drum 3. In connection with the fractionation block 13, the flushing medium block 17 or the pressure source 18, a measuring device 20 for measuring the amount of flushing medium to be fed into the sorter 1 can also be positioned. In Fig. 1, the measuring device 20 in 15 33445 / jw
    Rinsing medium block 17 positioned on the outside of the sorter 1. The measurement data determined by the measuring device 20 can be used, for example, to control the thickening of the fiber mass to be fed into the sorter 1 in such a way that the thickening of the fiber mass fractions passing through the accept block 11 and the reject block 12 out of the sorter 1 with respect to their further treatment is suitable despite the sinking effect of the flushing medium used in the sorter 1 on the thickening of the fiber mass.
    The supply openings 15 for supplying the flushing medium in the direction of the sorting surface 10 on the screening drum 3, which are positioned in the fractionating blocks 13 and shown in FIGS. 1 and 2, can also be replaced by individual nozzles to be positioned in the sorter 1, each of which has a relevant feed opening 15. In this case, each nozzle can be supplied by its own separate flushing medium channel for supplying the flushing medium into the feed opening 15. For example, the feed opening 15 may also form a continuous gap extending substantially over the entire length of the screen drum 3. The fractionation blocks 13, nozzles and slit-shaped supply ports are preferably positioned at equal intervals in the vicinity of the circumference of the screen drum 3 on the accept chamber side in the sorter 1. However, at least one fractionation block 13, a nozzle, and a slit-shaped supply port are respectively positioned in the vicinity of the circumference of the screen drum 3 on the accept chamber side in the sorter 1. Thus, the sorter comprises at least one feed opening 15 for the flushing medium arranged in the accept chamber 9 for feeding the flushing medium out of the accept chamber 9 16... 33445 / j or from the direction of the accept chamber 9 against the or in the direction of the screen drum 3 for cleaning the screen drum 3, wherein the feed opening 15 is a static, that is stationary or located in one place.
    The feed openings 15 can be formed in many ways so that they are not prone to clogging because of the fiber mass, even if longer intervals would occur when supplying the rinsing medium via the feed openings. The irrigation medium supply openings 15 and the fractionation block 13 or other devices through which the irrigation medium may be supplied may also be coated with such materials as to inhibit adhesion of the pulp and contaminants therein.
    By supplying the flushing medium with an increased pressure in the direction of the sorting surface 10 on the screen drum 3, the screen drum 3 can be cleaned in a simple manner during operation of the sorter 1 by the contaminants and fiber nodes adhering to the screen drum 3 and in their openings be that the operation of the sorter 1 does not have to be stopped. By feeding the flushing medium from the accepting chamber 9 or from the direction of the accepting chamber 9 towards or in the direction of the screening drum 3, the contaminants and fiber knots adhering to the sorting surface 10 on the screening drum 3 or in its openings 8 are returned to the feeding chamber 6 in the sorter 1 from where they gradually move further towards the reject block 12 and out of the sorter 1 out. Furthermore, when supplying the flushing medium from one or more static feed openings for the flushing medium, the flushing medium supply can be carried out in a manner which is simple in terms of its construction, low in cost and highly reliable in terms of functional reliability. The cleaning of the sorting surface 10 and its openings 8 increases the sorting capacity of the sorter 1 and is conducive to the achievement or maintenance of a uniform sorting result. A clean sorting surface 10 also reduces a rotational resistance of the screen drum 3 and thus the amount of energy required for the rotation of the screen drum 3.
    By supplying the rinsing medium after the solution, it is possible to replace the static foiler blades often used in sorters equipped with rotating or rotatable sieve drums, the object of which is to cause a suction pressure pulse acting on the sorting surface on the sieve drum The task is also to rinse the sorting surface of the sieve drum. Alternatively, by the supply of the flushing medium shown here in the direction of the sorting surface on the screen drum, the cleaning effect directed at the sorting surface on the screen drum can be made more effective in such sorters in which static foil leaves are used.
    FIG. 3 schematically illustrates a second sorter 1 viewed from the side and in cross-section, and FIG. 4 schematically illustrates part of a sorter of FIG. 3 open from above. The sorter 1 of FIG. 3 has a body construction 2, in FIG the interior of which a rotatable screen drum 3 is positioned. The screen drum 3 can be rotated by a motor 4, and to change the rotational speed of the screen drum 3, the rotational speed of the motor 4, for example, by a 33445 / jw
    Motor 4 coupled frequency converter 5 are changed according to the one shown in connection with the explanation of FIG. 1.
    In a sorter 1 according to FIGS. 3 and 4, the feed chamber 6 in the sorter 1 forms a volume between the screen drum 3 and the body structure 2 for the sorter 1, to which the fiber mass to be fed into the feed chamber 6 in the sorter 1 is to be seen can be supplied with the feed chamber 6 in connection feed block 7 in a manner schematically shown by an arrow F. In the case shown in FIG. 3, the feeding block 7 is positioned in the upper part of the sorter 1, but the feeding block 7 can also be positioned in the sorter 1 in a manner different from that shown in FIG.
    In a sorter 1 according to FIGS. 3 and 4, the inner volume of the screening drum 3 forms an acceptance chamber 9 or an acceptance space 9 in the sorter 1, where part of the fiber mass fed into the supply chamber 9 passes through the openings 8 in the sorting surface 10 on the screening drum 3 arrives. The portion of the fiber mass reached in the accepting chamber 9 in the sorter 1 can be removed from the sorter 1 via the acceptance block 11 located in the context of the acceptance chamber 9 in the manner shown schematically by an arrow A, in order in the subsequent phases of the production process of the fiber mass to be used further. In the case shown in FIG. 3, the accept block 11 is positioned in the lower part of the sorter 1 below the screen drum 3, but the accept block 11 can also be positioned in the sorter 1 in a different way than shown in FIG. 19 ο ··· ** »··· · ·· 33445 / jw
    The reject block 12 in the sorter 1 is positioned in the lower part of the sorter 1 below the feed chamber 6, but the reject block 12 can also be positioned in the sorter 1 in another way.
    In a sorter 1 according to FIGS. 3 and 4, a stator 21 fixedly supported in the body structure 2 for the sorter 1 is furthermore positioned inside the screening drum 3, which comprises a stator 21 in the body structure 22 and in this wing 24 supported by support arms 23 , When the screen drum 3 is rotated in a clockwise direction in FIG. 4, the fiber mass in the sorter 1 forces itself between the foil wings 24 and the screen drum 3 by the action of the rotating screen drum 3, thus forming a pressure pulse for the fiber mass to be viewed with a foil wing fractionation which makes the cleaning of the screen drum 3 and the openings 8 therein more effective. The foil wings 24 thus control the fiber mass flow with respect to the sorting surface 10 in such a way that upon rotation of the sieve drum 3, the foil wings 24 generate a suction pressure pulse which acts on the fiber mass on the sorting surface 10 on the sieve drum 3 and whose task is the sorting surface 10 to rinse on the screen drum 3.
    The sorter 1 according to FIGS. 3 and 4 further comprises feed openings 15 positioned in the direction of the screen drum 3 on the surface 25 of the foil blade 24 for feeding the flushing medium out of the accepting chamber 9 or out of the direction of the accepting chamber 9 in the sorter 1 against or in the direction of Screening drum 3 for cleaning the sorting surface 10 on the screen drum 3 of the adhering to the sorting surface 10 and in the openings 8 contaminants and fiber nodes. The 20 • · · · · · • * * 9 9 * • · ♦ 9 9 9 33445 / jw
    Feed ports 15 for the rinse medium may be positioned in a variety of ways in the surface 25 of the foil blade 24, but preferably the feed ports 15 are positioned in the manner illustrated in FIG. 4 at the location in the surface 25 of the foil vane 24 whose removal from the screening drum 3 is the lowest. Since the stator 21 is firmly supported in the body structure 2 for the sorter 1, the supply openings 15 are thus static, that is, at one point or stationary.
    The feed openings 15 for the flushing medium are connected to a flushing medium channel 16 located on the inside of the body construction 22 for the stator 21 and the support arms 23 for the foil wings 24, via which the flushing medium can be fed into the feed openings 15. However, it is possible that the flushing medium channel is also formed on the outer surface of the body structure 22 for the stator 21 and the support arms 23 for the foil wing 24. The flushing medium channel 16 is further connected to a flushing medium block 17, which has a pressure source 18, such as a pump to the flushing medium with an increased pressure from the positioned in the foil blade 24 feed openings 15 in the direction of the sorting surface 10 on the screen drum 3 on the side supply the accept chamber 9. The pressure source 18 can be positioned either on the inside or the outside of the sorter 1, but preferably on the outside of the sorter 1, to simplify the construction of the sorter 1. The same pressure source 18 and the flushing medium block 17 can be arranged in order to supply the flushing medium to each foil blade 24 present in the sorter 1. In Figures 3 and 4, the foil wings 24 are positioned in the same direction with the center axis of the screen drum 3, 21 * * * * * ·· »··· V r · · * · * * ·« * · # »* · However, the foil wings 24 can, even in an oblique position to the central axis of the Screen drum 3 are positioned.
    By means of the solution shown in FIGS. 3 and 4, in the case of sorters 1 equipped with static foil blades 24, the cleaning of the sorting surface 10 on the rotatable screen drum 3 can be made more effective for the flushing medium with feed openings 15 which are positioned on the foil wings 24 , The advantages associated with the solution are similar to those shown in connection with the explanation of Figures 1 and 2. Other features, such as the flushing medium to be used and measuring the amount of flushing medium used, may be as illustrated in connection with the explanation of FIGS. 1 and 2. In Figures 3 and 4, the stator 21, the support arms 23 and the foil wings 24 are shown substantially larger in construction than the sorter 1 for the sake of clarity. In addition, for the sake of clarity, some mold lines of the foil wings 24 have not been shown.
    The solution according to FIGS. 3 and 4, in which the feed openings for the flushing medium are positioned in the foil wings 24, can also be used in conjunction with the solution used in the fractionation block 13 in FIGS. 1 and 2, if after the sorter 1 FIGS. 1 and 2 also include a stator 21 equipped with foil wings 24. In a sorter 1 according to Figures 1 and 2, in which for supplying the flushing medium a
    Fractionation block 13 is used, the accept chamber 9 is arranged on the outside of the screen drum 3, but the accept chamber 9 could also be on the inside of the screen drum 3 22 22 '' '# 3 344 5 / jw to be ordered. Accordingly, in a sorter 1 according to Figures 3 and 4, are used in the 21 for supporting the flushing medium supported in the stator blades 24, the accept chamber 9 disposed on the inside of the screen drum 3, but the accept chamber 9 and the stator 21 together with foil wings 24th could also be arranged on the outside of the screen drum 3.
    In Fig. 5, a third sorter 1 is schematically seen from the side and shown in cross section, in Fig. 6, a sorter according to Fig. 5 is shown schematically open from above and Fig. 7 schematically shows a detail of the sorter of FIG. 5 and In the sorter 1 according to Fig. 5, an axis 26 of the screening drum 3 is shown, which can be coupled for rotating the screen drum 3 to a motor 4 shown in Figures 1 and 3. In the upper part of the sorter 26 fasteners 27 are arranged on the axes 26, with which the axis 26 is fixed to the screen drum 3 in order to transmit the force required to rotate the screen drum 3 from the motor 4 to the screen drum 3. In the lower part of the sorter 1 are still shown schematically support members 28 for supporting the screen drum 3 when it rotates. In addition, in Fig. 5 nor a lid construction 29 and a bottom construction 30 for the sorter 1 are shown. In FIG. 5, in the sorter 1, for clarity, the feed block 7, the accept block 11 or the reject block 12 are not shown.
    A sorter 1 according to FIGS. 5 to 7 further includes a fractionation block 13 positioned in the acceptance space 9 on the outside of the sieve drum 3 for supplying the rinsing medium for cleaning the sorting surface 10 at the 33445 / jw
    Sieve drum 3. The fractionation block 13 is supported by support members 14 in the body structure 2 for the sorter l. In a sorter 1 according to FIGS. 5 to 7, the fractionation block 13 is formed from a tube 31, in the wall of which feed openings 15 for supplying the flushing medium against the sorting pool 10 on the screen drum 3 on the side of the accepting chamber 9 with respect to the screening drum 3 are formed are. The flushing medium may also be supplied, for example, from the bottom of the sorter 1 via the flushing medium block 17 into the tube 31. The free inner volume of the tube 31 forms the flushing medium channel 16 for supplying the flushing medium into the feed openings 15.
    FIG. 8 schematically shows, viewed from above, a detail of an embodiment which, for example, can be used in a sorter 1 according to FIG. 5 for arranging the rinsing medium supply. In the embodiment according to FIG. 8, a wave-like construction 32 is arranged in the body construction 2 for the sorter 1, which has been brought about with a partition wall construction 33 fixed in the body construction 2 for the sorter 1 and positioned in the acceptance chamber 9, which is preferably located in FIG Substantially over the entire length of the screening drum 3 extends. Together with the body construction 2 for the sorter 1, the intermediate wall construction 33 delimits the space 34 which forms the feed chamber or the feed medium for the flushing medium separate from the accept chamber 9, into which the flushing medium, similar to, for example, shown in FIG a pressure source 18 and the flushing medium block 17 can be supplied. The wave-like construction 32 has a wave peak 35 or a tip 35 in the direction of the screen drum 3. In the apex of the vertex 35, preferably at a position close to the sieve drum 3, there is a turret 35, which is at a position near the sieve drum 3
    Feeding port 15 for supplying the flushing medium in the direction of the screen drum 3 for cleaning the sorting surface is positioned on the screen drum 3, whereby the pressurized flow of the flushing medium via the feed openings 15 for the flushing medium effectively cleans the openings in the screen drum 3. The wave-like constructions 32 shown in FIG. 8 are preferably positioned at equal intervals to the outer circumference of the screening drum 3.
    In Fig. 9, a detail of an embodiment is shown schematically seen from above, which, for example, in a sorter 1 of FIG. 5 for arranging the
    Rinsing medium supply can be used. In the embodiment according to FIG. 9, a wave-like construction 32 is arranged in the body construction 2 for the sorter 1, which has been brought about with the partition wall construction 33 fixed in the body structure 2 for the sorter 1, positioned in the accept chamber 9, wherein the partition wall construction 33 together with the body construction 2 for the sorter 1 limits the space 34 separated from the acceptance chamber 9. The wave-like construction 32 has a wave crest 35 or a tip 35 in the direction of the sieve drum 3, in connection with which a feed tube 15 equipped with a feed tube 15 is positioned inside the chamber 34, which has a fractionation block 13 for supplying the rinsing medium from the feed openings 15 in the direction of the screen drum 3 for cleaning the sorting surface on the screen drum 3 forms. The tubular fractionation blocks 13 positioned in connection with the wave-like constructions 32 and their corrugation peaks 35 illustrated in FIG. 9 are preferably shown in FIG. .:. .:. : '5 * 3445 / jw evenly spaced from the outer circumference of the screening drum 3,
    In the embodiments illustrated in FIGS. 8 and 9, the waveform may be realized, for example, with one or more circular arcs. The waveform can also have, for example, the shape of a triangle, square, rectangle or polygon from the cross section.
    It is also possible that the partition wall construction 33 is positioned in the accept chamber 9 in such a way that between the body structure 2 for the sorter 1 and the screen drum 3 a space 34 separated from the accept chamber 9 and extending around the entire circumference of the screen drum 3 which may constitute one of the similar irrigation medium supply chamber shown in Fig. 8 or may be positioned in the tubes 31 for arranging fractionation blocks in the respective space in the manner shown in Fig. 9.
    In Fig. 10, a fourth sorter 1 is schematically seen from the side and shown in cross section, in Fig. 11, the sorter 1 of FIG. 10 is shown schematically open from above and in Fig. 12 is a detail of the sorter 1 of FIG 10 and 11 shown from above.
    The sorter 1 in FIGS. 10 to 12 differs from the sorter in FIG. 5 in that the feed chamber 6 in the sorter 1 has been positioned on the outside of the screen drum 3 between the screen drum 3 and the body structure 2 for the sorter 1 and the acceptance chamber 9 in the sorter 1 is 26 26th to the inside
    «····· ··· t * φ 33445 / jw of the screening drum 3 is positioned. Furthermore, in the sorter according to FIGS. 10 to 12, the stator 21 is positioned on the inside of the screening drum 3, the body construction 22 for the stator in the lower part comprising a support flange 22 'supporting the sorter 1 in the floor construction 30. In the body structure 22 for the stator 21 are arranged arms 36 in which a fixed in the body structure 22 for the stator 21 first end 36 'and a fixed end 36' 'and a direction away from the body structure 22 for the stator 21 second end 36 '' or free end 36 '1 is attached. At the free end 36 '' of the boom 36 is substantially in the longitudinal direction of the screen drum 3 extending, realized in the form of a tube 31 fractionation block 13 for supplying the flushing medium to the sorting surface 10 on the screen drum 3 or against this to clean the sorting surface 10 at the Screening drum 10 is arranged. The operating principle of the flushing medium supply is correspondingly as already described, for example, in connection with FIGS. 1 to 7.
    In Fig. 13, a fifth sorter 1 is schematically seen from the side and shown in cross section, in Fig. 14, a sorter 1 of FIG. 13 is shown schematically from above and in Fig. 15 is a detail of the sorter 1 of FIG 13 and 14 shown from above.
    The sorter 1 in FIGS. 13 to 15 differs from the sorter of FIG. 10 in that the foil wings 24 in the body construction 22 for the stator 21 are supported on the sorter 1 by means of support arms 23. In the interior of the foil wing 24 of the realized in the form of a tube 31 fractionation block 13 is arranged and in the direction 27 27th
    5 * 3 4 4 5 / jw of the screen drum 3 is in the surface 25 of the foil blade 24 and in the wall of the tube 31, the feed port 15 for the flushing medium or equipped with a supply port 15 nozzle for supplying the flushing medium against or in the direction of Sorting surface 10 is arranged on the screen drum 3 for cleaning the sorting surface 10 on the screen drum 3. The functional principle of the flushing medium supply is similar to that previously shown, for example, in connection with FIGS. 1 to 7.
    In the solution according to FIGS. 5 to 15, if necessary, the position of the feed chamber 6 and the accept chamber 9 can be exchanged with one another, so that they are arranged opposite to one another as shown in the figures. In the solution according to FIGS. 5 to 12, it is also possible to use static foil wings 24, which can be equipped with feed openings 15 for the flushing medium or can be realized without feed openings for the flushing medium.
    The fractionation block 13, or more particularly that of the similar flushing medium supply chamber 34 shown in FIG. 8, which may also be considered as a fractionation block, is preferably realized as a tube 31 or as a cylinder, on the wall of which are feed openings 15 or nozzles 15 forming a feed opening for feeding the flushing medium in the direction of the screen drum are arranged against the screen drum 3. The feed openings 15 are circular in terms of strength, but may also be elongate, for example, whereby the cleaning effect of the individual feed opening 15 extends over a larger portion in the longitudinal direction of the sieve drum 3. The flushing medium supply into the fractionation blocks 13 or into the similar feed chamber 34 for the flushing medium shown in FIG. 8 can, for example, be arranged via a pressure-retaining pipe formation. The fractionation block 13 in the form of a tube 31 or the feed chamber 34 are material and manufacturing technology advantageous because they withstand a high flushing medium pressure with relatively thin wall thicknesses. In addition, the fractionation block 13 in the form of a pipe or cylinder or the flushing medium feed chamber 34 has a shape such that the accept mass does not readily adhere to it, thereby jamming the mass in the fractionation blocks 13 or the surface of the feed chamber 34 the flushing medium and caused by this flow disturbances are avoided.
    For controlling the amount of flushing medium, it is possible, for example, to use a differential pressure acting on the sorter 1, that is to say a differential pressure from the supply of the sorter 1 for accepting. If an increase in the differential pressure is caused by the fact that the openings are clogged in the screen drum, the pressure for the flushing medium is increased to increase the volume flow of the flushing medium and to optimize the flushing, whereby the openings in the screen drum open and at the same time the acceptance mass and the mass on the sorting side is diluted, whereby the differential pressure across the sorter is reduced and blockage of the openings in the sorter's screen drum is avoided.
    The pressure and flow rate for the flushing medium are selected to suit the particular sorter application to be used. The for feeding the 29 ............ 5r3445 / jw
    Rinsing medium used increased pressure can be, for example, an overpressure of 7 bar compared to the pressure acting in the sorter 1 process pressure. The process pressure for the sighting of fine and coarse sorters is usually in the range of 1 to 2 bar and generally does not exceed a pressure of 6 bar.
    In the case of machine sorters, fiber recovery sorters and dilution water sorters, the process pressure is again usually in a range of 2 to 14 bar. Depending on the position of the sorter in the process, the process pressure may also be in a different range.
    The removal of the supply ports 15 for the flushing medium from the sorting surface 10 as well as, for example, whether the flushing medium to be used is water or water vapor act on the value of the increased pressure to be used for the supply of the flushing medium. Often the size of a normal water supply network corresponding pressure of 4 to 10 bar for the flushing medium is sufficient as a supply pressure for the flushing medium. In some cases, however, the best-acting solution will only be achieved when the pressure for the flushing medium is raised to a range of 100 to 300 bar with a high-pressure pump, for example. A preferred pressure for the flushing medium may also be a pressure in a range between the pressure ranges shown above.
    The rinsing medium supply chamber 34, the fractionation block 13 or the foil vanes 24 positioned in the accept chamber 9, and in connection with which feed openings 15 for the rinsing medium or feed openings 15 are arranged, are preferably formed to be in the manner of FIG The surfaces are smooth and unbalanced, so they remain clean and prevent them from sticking to the well-behaved mass. In realizing the support of the fractionation block 13 for the flushing medium using the boom 36 shown in Figures 10 to 12, the cantilevers are at least slightly aligned in the flow direction of the case of the found good acceptance mass, thereby adhering the accept mass is avoided at this. Preferably, the boom or its surface are aligned relative to the attachment point of the boom at least at an angle of 20 degrees in the radial direction to the screen drum inclined in the flow direction of the accepting mass. The free end of the boom can thus be aligned with respect to the attachment point of the boom in the direction of rotation of the screen drum. The cantilever can also be aligned in the direction of the accept block 11 from the attachment point, ie at least to a certain extent in the flow direction of the accept mass.
    The distance between the feed opening 15 for the flushing medium or the opening located in the nozzle and the screen drum 3 is preferably selected to be low, so that the flushing and washing action produced by the pressurized flow of the flushing medium would be most effective for the openings in the screen drum. The distance in question is preferably 1 to 10 mm, and more preferably 2 to 8 mm. Measurement inaccuracies of the rotatable screen drum and movement of the screen drum caused during operation of static and dynamic forces in the radial direction limit reducing purging and washing removal. The flow characteristics of the sighted accept mass, in turn, also affect the choice of the distance for a purge jet. The choice of too small a distance can result in a jam of the accept mass, for example between the fractionation block and the screen drum, which can cause flow disturbances, blockages or rotation of the screen drum. The rinsing or washing removal and the rinsing or washing pressure are preferably arranged adjustable, whereby in the adjustment of the rinsing removal or the rinsing pressure such a cleaning efficiency is sought that the quality of the sighted acceptance mass corresponds to the required level and the capacity of the sorter is as large as possible. The rinsing or washing pressure for the rinsing medium can also be arranged in widely varying or pulsating manner, the flow fluctuation generated thereby effectively purifies the openings in the sieve drum and, on the other hand, fluidizes the mass in the acceptance chamber and in the feed chamber, whereby the flow properties of the mass remain good and the mass flows smoothly through the sorter 1.
    The direction of the rinse or water jet is selected by suitable formation of the feed openings 15 for the rinsing medium (s) and an alignment of the jet in the direction of the sieve drum in such a way that the sieving or washing flow impinging into the openings in the sieve drum Direction of the openings in the screen drum, whereby the openings are cleaned in the screen drum effectively. In some cases, the openings in the screen drum are best arranged so that the flow of the flushing medium in the direction of the openings with different rinses from different directions. This can preferably be arranged in such a way that the over 32 "* * • * · 9 9 9 m ........... * T 3445 / jw at different points on the circumference of the screen drum The flow of the flushing medium from at least one fractionation block or foil blade, with respect to the opening in the screen drum, from a different direction than the fractionation blocks or foil wings takes place as the flow taking place from a second fractionation block or foil wing. The flow of the flushing medium can also be arranged in such a way that each fractionation block or foil blade generates a flow in the direction of the openings in the screen drum that deviates from the direction of the flow diverging from the other fractionation blocks or foil blades in the direction of the openings the screen drum is generated.
    Furthermore, the purging medium jets of each individual fractionation block or foil blade can be arranged to produce jets in different directions and different shapes. For the purging medium jet, a shape most suitable in terms of the necessity of washing is selected as a cross-sectional shape for the feed port 15 or the nozzle including a feed port 15, for example, a circle, slit, triangle, quadrangle, polygon, or a star. The jets of a single fractionation block or foil blade can also be aligned crossing each other by means of the shape of the irrigation medium feed openings or the choice of nozzles. In a post-solution application, it is also possible to use point-like, fan-like or turbo-jet generating nozzles. With special nozzles, it is possible to turn the water into a rotating movement, which can make the cleaning effect more effective. The size of the feed opening or the nozzle is chosen so large that the flushing medium with such a high flow velocity penetrates into the sorted pool to be rinsed, that the openings be cleaned in the sieve drum. The speed of the flushing medium and the volume flow to be used for cleaning the openings in the screen drum depend, for example, on the size and shape of the openings in the screen drum and on the shape and direction of the beam directed onto the sorting surface.
    With the illustrated solution, if the apertures in the screen drum are kept open and the screen drum is kept clean, either only with the jets washing the screen drum or with the screens washing rinses combined with foil wings, the speed of rotation of the screen drum can be reduced. As a result, less energy is used to rotate the screen drum. As the screen drum can also be rotated more slowly, the forces caused by the rotation of the screen drum, reducing the screen drum forces, making the screen drum cheaper than previously made, for example, thinner materials or in the screen drum a larger area of the sorting openings of the entire surface the screen drum can be formed. These factors allow the sorter to achieve greater capacity than before. If foil leaves are dispensed with altogether, the so-called free area of the screening drum, through which the acceptance mass can flow without disturbance through the sieve drum, increases more than ever, which further increases the capacity of the sighting in comparison to earlier times.
    Cleaning of the sieve drum which takes place with the rinsing medium can thus supplement a cleaning performed with foil wings. As a result, cleaning of the screen drum with the flushing medium can only be effected for a part of the length in the axial direction 34............
    33445 / j W of the sieve drum. A preferred solution may be one in which the flushing medium is directed to a length which is one-half, one-third or one-fourth the height of the screen drum, depending on the effectiveness of cleaning the screen drum. Often it is advantageous to direct the flushing medium to effect the flushing on the end of the screen drum on the reject block side. The need for effecting the cleaning of the screen drum at the end or at a portion of the screen drum on the reject block side is caused by the mass to be screened tending to become thicker along the length of the screen drum in the direction of the position of the reject block. Accordingly, the proportion of foreign matter along the length of the screen drum increases in the direction of the position of the reject block, which may also cause a need to make the cleaning toward the position of the reject block more effective.
    Regardless of whether in the sorter only one realized with the Spülmediumzufuhr cleaning the screen drum takes place or realized with the Spülmediumzufuhr cleaning the screen drum combined with Foilflügeln, it may be advantageous to be effected with the flushing medium flushing capacity for the screen drum of the length of the screen drum accordingly adjust. The adjustment can be realized, for example, in such a manner that the size of the feed openings for the flushing medium or the nozzle varies over the length of the screen drum or in such a way that in the feed chamber for the flushing medium, a varying pressure at the height of the screen drum becomes. It may be necessary to make the flushing effect of the flushing medium more effective along the length of the screen drum, especially in the direction of • Λ * ι ······ IC · «Μ · * · · f ♦ JJ« · «* * ·« »· 5 / jw the position of the reject block in the sorter, as shown in the previous section. Page 33
    The solution can be used both in a continuous sighting and in the production of a lot, that is, in a sighting, in each case a certain amount of the fiber mass is spotted. In the aforementioned production of a lot, the flushing medium is preferably fed against the screen drum or in the direction of the screen drum, after the mass of fibers measured in the sighting has been sighted for the next quantity of fiber mass to be sighted before the start of the sighting. The usability of the solution is independent of the thickening of the fiber mass to be viewed.
    In some cases, the characteristics illustrated in this explanation can be used as such regardless of other characteristics. On the other hand, the characteristics shown in this explanation can be used as necessary to form different combinations.
    The drawings and the accompanying explanations are only intended to illustrate the spirit of the invention. Those skilled in the art will appreciate that the basic idea of the invention can be implemented in many ways in the development of the technique. The invention and its embodiments are thus not limited to the examples described above, but may vary within the scope of the claims.
    claims:
    权利要求:
    Claims (17)
    [1]
    Austrian and European Patent and Trademark Attorneys GIBLER & Sorter (1) for screening fiber mass, the sorter (1) having a body construction (2), a rotatable sieve drum (3) positioned inside the body structure (2), the drum surface equipped with openings (8) forms a sorting surface (10) for screening the pulp, a feed chamber (6) and a fiber mass feed block (7) associated therewith for feeding the pulp into the sorter (1), an accept chamber (9) and an associated acceptance block (11) for the fiber mass for removing a fiber mass fraction from the sorter (1) passed through the sorting surface (10) on the screen drum (3) and a reject block (12) for removing one comprising by the sorting surface on the screen drum fiber mass fraction from the sorter (1), characterized in that the sorter (1) weiterhi n for cleaning the sorted surface (10) on the screen drum (3) at least one static feed opening (15) for a flushing medium for feeding the flushing medium from the accept chamber (9) or from the direction of the accept chamber (9) against the screen drum (3) or in the direction of the screen drum (3). 37 33445 / jw
    [2]
    2. Sorter according to claim 1, characterized in that the sorter (1) for cleaning the sorting surface (10) on the screen drum (3) a plurality of in the accept chamber (9} positioned static feed openings (15) for the flushing medium for supplying the flushing medium the acceptance chamber (9) or from the direction of the accept chamber (9) against the screen drum (3) or in the direction of the screen drum (3).
    [3]
    3. A sorter according to claim 2, characterized in that the sorter (1) at least one in the accept chamber (9) positioned fractionation block (13) comprising a plurality of feed openings (15) for the flushing medium and at least one flushing medium channel (16) for supplying the Rinsing medium into the feed openings (15).
    [4]
    4. A sorter according to claim 3, characterized in that the fractionation block (13) in the accept chamber (9) in the direction of the central axis of the screen drum (3) in the sorter (1) is arranged.
    [5]
    5. Sorter according to one of the preceding claims, characterized in that the accept chamber (9) in the sorter (1) further comprises at least one stator (21) having at least one foil wing (24) for guiding a flow of the fiber mass with respect to the sorting surface (10 ) on the screen drum (3). 38 · «* ·» * »· *« «33445 /] W
    [6]
    6. The sorter according to claim 5, characterized in that the sorter (24) for cleaning the sorting surface (10) on the screen drum (3) at least one feed opening (15) for a flushing medium for supplying the flushing medium from the accept chamber (9) or Direction of the accept chamber (9) against the screen drum (3) or in the direction of the screen drum (3).
    [7]
    7. sorter according to claim 6, characterized in that the foil wing (24) comprises at least one fractionation block (13) having a plurality of feed openings (15) for the flushing medium.
    [8]
    8. A sorter according to claim 6, characterized in that the foil wing (24), the body construction (22) for the stator (21) and a foil wing (24) in the body structure (22) for the stator (21) supporting support arm ( 23) comprise at least one flushing medium channel (16) for supplying the flushing medium into the feed openings (15).
    [9]
    9. sorter according to one of claims 6 to 8, characterized in that the feed opening (15) for the flushing medium in the direction of the screen drum (3) is positioned at a location on the foil (24) located surface (25) at the distance of the foil blade (24) from the screen drum (3) is the lowest. 39 • * «· t · · · ............... 33445 / jw
    [10]
    10. Grader according to one of the preceding claims, characterized in that the fractionation block (13) is a tube (31), on whose wall openings for forming feed openings (15) for the flushing medium in the tube (31) are formed.
    [11]
    11. Grader according to one of the preceding claims, characterized in that the flushing medium is water or water vapor.
    [12]
    A method of screening a pulp, the method comprising sweeping the pulp with a sorter (1) comprising a body structure (2) and a rotatable screen drum (3) positioned on the inside of the body structure (2) with openings therein (8) equipped drum surface forms a sorting surface (10) for the screening of the fiber mass, and wherein in the process the fiber mass to be viewed in a feed chamber (6) in the sorter (1) via a related feed block (7) for the fiber mass supplied and a fiber mass fraction passing through the sorting surface (10) on the screen drum (3) from an accept chamber (9) in the sorter (1) via an accept block (11) for the fiber mass and one not through the sorting surface (10) on the screen drum (3) reached fiber mass fraction on a reject block (12) is removed, characterized in that for cleaning the sorting surface e (10) on the sieve drum (3) at least temporarily rinsing medium from the accept chamber (9) or from the direction of the accept chamber (9) against the sieve drum (3) or in the direction of the sieve drum (3) 40 * * »· · * · * ·· «·« _ _ -. _), 33445 / 1W at least via a static feed opening (15) of the flushing medium is supplied.
    [13]
    13. The method according to claim 12, characterized in that the flushing medium for cleaning the sorting surface is fed to the screen drum into the openings (8) in the sorting surface (10) on the screen drum (3).
    [14]
    14. The method according to any one of claims 12 or 13, characterized in that the flushing medium is supplied continuously.
    [15]
    15. The method according to any one of claims 12 to 14, characterized in that the amount of the supplied flushing medium is measured and a thickening of the in the feed chamber (6) in the sorter (1) to be supplied fiber mass due to the amount of the supplied flushing medium is regulated.
    [16]
    16. The method according to any one of claims 12 to 15, characterized in that the supplied amount of the flushing medium and / or the pressure due to a via the sorter (1) acting differential pressure is regulated.
    [17]
    17. The method according to any one of claims 12 to 16, characterized in that the flushing medium is water or water vapor. A /. < f, ZZ ~ Gibler & Poth Patent Attorneys OG (Dr. F, Gibler or Dr. W. Poth)
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    同族专利:
    公开号 | 公开日
    AT510619B1|2014-10-15|
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    DE102011085691A1|2012-05-10|
    FI20106165A0|2010-11-05|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB289397A|1927-04-26|1928-08-30|Paul Erkens|Centrifugal pulp strainer|
    US3311235A|1962-07-16|1967-03-28|Sten E E Ahlfors|Mechanical strainers|
    AT368781B|1979-05-21|1982-11-10|Escher Wyss Gmbh|SCREENING DEVICE FOR FIBER FIBER SUSPENSIONS, e.g. PAPER FIBER FIBER, WITH A ROTATING ROUND SCREEN|DE102016220819B4|2016-10-24|2018-09-20|Voith Patent Gmbh|Rotating drum|
    DE102018131295A1|2018-12-07|2020-06-10|Voith Patent Gmbh|Operating method for a plant for the production of a fibrous web|
    法律状态:
    2021-07-15| MM01| Lapse because of not paying annual fees|Effective date: 20201104 |
    优先权:
    申请号 | 申请日 | 专利标题
    FI20106165A|FI20106165A|2010-11-05|2010-11-05|Sorting machine and method for sorting fiber pulp|
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