• 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:
    It is a separator for the separation of coarse particles from a particle flow in the course of the production of wood-based panels, in particular wood fiber panels, with at least one classifier housing, which has a material inlet, a plurality of inlet intakes arranged below the material inlet, an exhaust outlet and a coarse material outlet. According to the invention, a first (upper) air intake and a second (lower) air intake are provided. The sifter is characterized in that the lower front wall (convex) arranged between the first air inlet and the second air inlet is curved or at least has a (convex) curved section, so that in the interior between the first air inlet and the second air inlet one through the first Zulufteinlass entering first air flow supporting supporting vortex forms.
    公开号:AT519034A2
    申请号:T299/2017
    申请日:2017-07-18
    公开日:2018-03-15
    发明作者:
    申请人:Siempelkamp Maschinen & Anlagenbau Gmbh；
    IPC主号:
    专利说明:

    Coarse particles from a particle stream in the course of the production of wood-based panels, in particular wood fiber boards, with at least one classifier housing which has at least one material inlet, a first supply air inlet arranged below the material inlet and a second supply air inlet arranged below the first supply air inlet, an exhaust air outlet (arranged above the two supply air inlets) and has a coarse material outlet (arranged below the second supply air inlet). The upper front wall of the classifier housing arranged above the first supply air inlet can at least in some areas, i.e. be oriented at a certain height, inclined to the vertical.
    Such a classifier is used to purify
    Particle flows in the wood-based materials industry and in particular to remove unwanted components from the particle flow. For example, Metal parts, coarse fibers,
    Pieces of rust, adhesive particles or lumps of adhesive removed /
    are used to protect downstream systems or system components, in particular the steel belts of continuously operating wood-based material presses, from damage. The classifier is particularly preferably used in the course of the production of wood fiber boards to separate coarse particles from the fiber stream and consequently from the (glued) wood fibers (e.g. rubberwood fibers). Fiberboard means e.g. MDF boards (medium density fiber). In the course of the production of the fibers for wood fiber boards, the wood is first defibrated (in a refiner) and wet glued (e.g. in a blowline) and then dried. The classifier is preferably arranged downstream of these system components and particularly preferably the dryer of such a system.
    2/24
    The classifier works as an air classifier in that the material to be classed is introduced into the classifier housing via the material inlet and an air flow is applied to the side, which is blown into the classifier housing via the supply air inlets. The fibers are captured by the air flow or the air flows and discharged with the air flow via the (upper) exhaust air outlet and an exhaust air line connected to it. Coarse particles with a greater weight are not caught by the air flow and fall down into the area of the coarse material outlet, which can be provided with a lock, so that the (undesired) coarse particles are removed.
    A sifter of the type described is e.g. from the
    EP 0 795 359 B1 known. This classifier has a first (upper) material inlet for the supply of upper air and a second (lower) material inlet arranged below it for the supply of lower air. The upper air reaches the inside of the classifier via an upper line and at the mouth of the upper air line the particles are caught by the air flow in the upper air and whirled upwards. There is a high material concentration at the upper edge of the inflow cross-section of the upper air, which makes it difficult for the fibers to be caught by the air flow at these points, especially with large amounts of material. By a
    Increasing the speed of the inflowing air can also absorb larger amounts of material from the air flow, but this has an unfavorable effect on the sighting. To avoid these disadvantages, are in the mouth
    Upper air line in the classifier horizontal, parallel
    Internals arranged in the form of distribution pipes. These are said to be the vertical component of the speed vector of the
    3/24
    Increase incoming air and the distribution pipes are to prevent material from getting into the line of the upper air and being deposited there. The visual efficiency is also to be increased by the additional supply of sub-air via the sub-air line. Such a classifier with upper air line and lower air line has generally proven itself in practice. However, the known embodiment can be further developed. - This is where the invention begins.
    For the rest, a classifier for separating coarse and fine material in the production of wood fiber boards is known from EP 1 900 445 B1, in which a plurality of inlet openings arranged one above the other are also provided for the classifying air. These inlet openings for the classifying air are staggered in order to improve the cross-flow classifying in the conveying direction of the material, ie in the classifying air flow direction towards the discharge opening. Preferably, three inlet openings arranged one above the other should be provided for the classifying air.
    Finally, US Pat. No. 5,725,102 describes an embodiment of a sifter with zigzag plates, which works both gravimetrically and centrifugally. In this case, a zigzag-shaped viewing area is followed by a deflection line with subsequent material switch, so that due to the
    Centrifugal forces are divided into a fiber-air mixture on the one hand and air on the other.
    Starting from the known prior art and in particular EP 0 795 359 B1, the invention is based on the object of creating a classifier of the type described at the outset, which is simple in construction and
    4/24 economical construction due to an increased
    Visual efficiency distinguishes.
    To achieve this object, the invention teaches in a classifier of the type described in the introduction that the lower front wall arranged between the first supply air inlet and the second supply air inlet is curved, preferably convexly curved, or at least has a curved, preferably convexly curved section, such that in the interior between the first supply air inlet and the second supply air inlet forms a support vortex supporting the first air flow entering through the first supply air inlet. The lower front wall is preferably convexly curved or has at least one convexly curved section. In this case, convex curved means in relation to the outside of the housing. The curvature preferably extends (substantially) over the entire width of the lower front wall, and particularly preferably with an identical curvature over the width, so that a curvature about a curvature with respect to a horizontal axis is realized.
    According to the invention, at least two supply air inlets arranged one above the other are provided, so that on the one hand an upper air line for supplying a first air flow and on the other hand an under air line for supplying a second air flow are provided. The classifier housing or its (lower)
    Front wall constructed in such a way that a support vortex is formed which supports the upper supply air flow. In this way, the classifier can be operated in a particularly stable and energy-efficient manner. In particular, with different loading numbers or with fluctuating
    5/24 • · • · ft
    Load quantity, the upper air flows are stabilized. While the lower front wall is provided between the first supply air inlet and the second supply air inlet, an upper front wall is provided above the first supply air inlet and consequently between the material inlet and the first supply air inlet, which is preferably inclined at least in some areas, i.e. over a height section, with respect to the vertical.
    It is expedient if this second (supporting) air flow, which is supplied via the lower inlet air inlet, enters the interior at an increasing incline. This is realized in that a second supply air connection is connected to the second supply air inlet, which is designed to be inclined at an increasing angle to the horizontal, so that a second supply air flow is generated which enters the interior in an increasingly inclined orientation against the horizontal. As an alternative or in addition, such a construction can also be implemented for the first supply air inlet. For example, a first supply air connection can be connected to the first supply air inlet, which is designed to be inclined with increasing inclination relative to the horizontal and to generate a first supply air flow entering the interior in an increasing inclined orientation with respect to the horizontal.
    In a preferred further development it is provided that the
    In a side view, the upper edge of the first supply air inlet is arranged in alignment above the lower edge of the first supply air inlet or protrudes by a dimension above the lower edge. It is preferably provided that this first supply air inlet has a free inflow cross section into the interior of the classifier housing and is consequently designed without any internals or distribution elements
    6/24 that the inflow cross section is not hindered by internals, distribution elements or the like. The same can be done for the second supply air inlet.
    The invention is based on the knowledge that the penetration or dropping of (to be prospected) material into the respective supply air inlet or the supply air line connected therein is reliably avoided by appropriate design of the classifier housing or the front wall of the classifier housing and corresponding arrangement of the air inlet leaves, without protective grilles or similar installations in the air lines are required. By dispensing with such installations or protective grilles, pressure losses can be reduced and the flow can be made more uniform, so that, according to the invention, the visual efficiency and / or energy efficiency is increased. The upper edge of the supply air inlet particularly preferably projects a dimension M above the lower edge, i.e., in a side view, the upper edge of the supply air inlet or a supply air line connected to it protrudes further into the interior of the classifier housing than the lower edge with respect to a vertical. This embodiment described can be implemented either for the first supply air inlet or for the second supply air inlet or for both supply air inlets.
    In addition, it is preferably provided that the upper front wall has a curved guide wall section (above) adjoining the upper edge of the supply air inlet and particularly preferably a convexly curved guide wall section. In this case, convex curved means in relation to the outside of the housing. Such a curved guide wall section preferably adjoins the upper edge of the supply air inlet, so that the upper front wall
    7/24 is connected via this curved guide wall section directly to the upper edge of the supply air inlet and thus to the upper edge of the connected supply air line. Such a curved baffle section ensures an even flow of air and thus improves operation and visibility efficiency by reducing pressure losses in the sifter. Moreover, such a curved guide wall section also prevents particles from entering the air inlet or the connected supply air line.
    In the classifier according to the invention, the upper front wall preferably has a vertically oriented upper wall section which is adjoined (below) by a wall section inclined to the vertical. Such an embodiment is e.g. known from EP 0 798 359 B1. Proceeding from this, however, according to the invention preferably follows the inclined one
    The curved guide wall section already described on the underside of the wall section, so that a vertically oriented upper wall section, a central wall section inclined against the vertical and a curved lower guide wall section are then provided for the front wall. The front wall and preferably the wall sections described extend over the (entire) width of the classifier and consequently from one side wall to the other side wall.
    In a preferred development, it is provided that the inclined upper front wall or its inclined wall section is arranged at an angle of less than 20 °, preferably less than 15 °, with respect to the vertical. This front wall or its inclined wall section is consequently oriented more steeply than in the prior art according to EP 0 795 359 B1, so that the viewing zone within the classifier can be enlarged overall and the separator quality can thus be improved.
    8/24 • ·
    This means that unwanted particles of smaller size and weight can be separated. In addition, the capacity of the classifier is increased so that more material can be passed through per meter classifier width.
    In a preferred development, there is the possibility that the upper front wall or at least one wall section, e.g. the inclined wall section can be adjusted against the vertical so that the angle of inclination is consequently adjustable. In this way, the viewing zone can be adapted to the respective application. For example, For applications in which there are no particularly high demands on the sighting performance, reduce the sighting zone in order to be able to work more energy-efficiently. If high demands are placed on the sighting performance (e.g. in the production of vapor plates with a thickness of up to 3 mm or also in the manufacture of rubberwood material), the sighting zone can be achieved in the manner described by a steep inclination of the
    Front wall can be enlarged.
    According to a further proposal, provision is made for the first and / or second supply air inlet (in each case) to extend over (essentially) the entire width of the classifier housing. While in the prior art generally a plurality of supply air inlets arranged side by side or a plurality of air lines arranged side by side are connected to the classifier housing, the invention proposes a supply of the visual air via a (uniform) air inlet extending over the entire width and accordingly one over the entire Wide supply air spigot. This configuration can either be for the first (upper) supply air inlet or for the .9 / 24 • · • · • ·· · · ·· · · · · ·· ·· ·· ·· ·· ·· second (lower) supply air inlet or can also be implemented both for the upper air inlet and for the lower air inlet. The adjustment of the supplied air volume can then be varied for an air inlet via a single flap, so that a simple and faster adjustment of the air volumes can be realized. There is an option to increase the flow velocity in the edge area on the sides of the air lines using special air baffles.
    Furthermore, it is optionally provided that a separating wall is arranged in the classifier housing (at least in some areas) into an inlet chamber and an outlet chamber. As described in EP 0 795 359 B1, this partition can be designed as a pivoting flap so that the geometry of the viewing space can be changed. According to the invention, however, there is optionally the possibility that the partition wall can be adjusted or adjusted in height along the height direction of the classifier housing. This partition, which is also referred to as a sword and is preferably arranged in the center of the classifier, forms a baffle for the fibers, so that the fibers are guided to the air outlet via this baffle. The height adjustment enables adjustment of the area that protrudes into the classifier. In this way, the effectiveness of the deposition can be varied or increased with different tonnages.
    The classifier housing of the classifier according to the invention has the exhaust air outlet already described, via which the air which is supplied via the supply air inlets is discharged together with the particle stream. An exhaust air duct is usually connected to this air outlet. Prefers
    10/24 • · • · this exhaust air line has a deflection bend connected to the exhaust air outlet, which extends over a deflection angle of at least 150 °, preferably at least 170 °, e.g. extends about 180 °. A material switch then preferably adjoins this deflection bend. Because of the centrifugal forces that occur, a division into a fiber / air mixture on the one hand and in air on the other hand succeeds in this area, so that a certain amount of air can be separated from the amount of fibers. The entire system thus works more energy-efficiently, since a smaller volume of air is transported on via a fan with an open impeller. This reduces the power requirement on the shaft. The separated air quantity is fed back to the sifter (s) via a fan with a closed impeller and, if necessary, previously mixed with fresh air. The invention makes use of the principle of dividing the material flow known from US Pat. No. 5,725,102, but transfers it a sifter that works only gravimetrically.
    The invention is explained in more detail below on the basis of a drawing illustrating only one exemplary embodiment. Show it
    1 a sifter according to the invention in a simplified perspective view,
    2 shows a vertical section through a classifier according to FIG.
    and
    Fig. 3 shows the object of FIG. 2 with particle flows shown and
    11/24 • · · · ·· · · ··· • · · ·· ·· · · · · ·· · · »· ·· ·· · ·
    Fig. 4 shows the subject of Fig. 2 with air flows shown.
    In the figures, a sifter for the separation of coarse particles from a particle stream, in particular fiber stream, is shown in the course of the production of wood-based panels, in particular wood-fiber boards. Such a classifier is preferably integrated in a plant for the production of wood-based panels, in particular in order to remove undesired constituents (for example metal parts, lumps of adhesive, coarse fibers, rust pieces or the like) from a material flow (for example from glued fibers), in particular for downstream plants or Protect system parts (e.g. steel belts of a continuously working wood-based panel press) from damage.
    The classifier has a classifier housing 1, which has a front wall 2, a rear wall 3 and two side walls 4 in its basic structure. The designation front wall 2 and rear wall 3 refer to the main direction of flow of the incoming visible air. The classifier housing 1 has a material inlet 5 on its upper side, through which e.g. glued fibers are introduced, which e.g. can be fed from a dryer after gluing. In the area of the material inlet 5 or above or below the material inlet, dissolving elements, e.g. Opening rollers 6 may be arranged, which are only indicated in the figures. The fibers F enter the interior 7 of the classifier housing 1 via the material inlet 5. The classifier housing has a first, upper supply air inlet 8 below the material inlet 5 in the front wall 2. A second, lower inlet air inlet 9 is arranged below the first inlet air inlet 8. In the illustrated embodiment, the
    The upper supply air inlet 8 is formed by a supply air connection 8a, to which a supply air line 8b is connected. The lower supply air inlet 9 is formed by a supply air connection 9a to which a lower supply air line 9b is connected. A coarse material outlet 10 is arranged below the inlet air inlets 8, 9 or at the lower end of the classifier housing 1.
    The upper air Li is supplied via the upper inlet air inlet 8 and the fibers F entering via the material inlet 5 are caught by the air flow and transported upwards into the region of the outlet air outlet 11, which is formed by an outlet nozzle 11a to which an outlet air line 11b is connected . Coarse particles, e.g. Metal or rubber particles are not transported by the air flow into the area of the exhaust air outlet 11, but fall down into the area of the coarse material outlet 10 and are e.g. transported away via a lock, not shown. Due to the lower air L2 provided in addition to the upper air, the viewing efficiency is basically eliminated
    EP 0 795 359 B1 optimized way described.
    In the exemplary embodiment shown, the upper front wall 12 arranged above the upper inlet air inlet 8, which consequently extends into the area of the material inlet 5, is oriented inclined to the vertical over a certain height section. The figures show an embodiment in which the upper front wall 12 has a vertically oriented upper wall section 12a and below that a wall section 12b inclined to the vertical. In the exemplary embodiment, this (middle) wall section 12b is adjoined by a (convex) curved (lower) guide wall section 12c, which extends as far as the upper one
    Supply air inlet 8 extends. The upper edge 13 of the jumps
    13/24 • * · · · 4 · * ·· # · ♦ · • ·
    Inlet air inlet 8 in a side view by a dimension M above the lower edge 14 of the inlet air inlet 8. In the side view shown in FIG. 2, the upper edge 13 is consequently arranged to the right by a dimension M and consequently further towards the interior of the classifier. The construction shown prevents particles and, in particular, material to be filtered out from penetrating through the air inlet 8 into the supply air line 8b or the supply air connector 8a. This has the advantage that on internals, protective grilles or the like in the area of the air inlet 8 or
    Inlet port 8a or the air line 8b can be omitted, so that the inlet air inlet 8 has a free inflow cross section without internals.
    The one shown with the upper air inlet 8
    Design is the same for the bottom
    Supply air inlet 9 realized. There, too, the upper edge of the inlet air inlet 9 protrudes by a measure towards the interior in relation to the lower edge. Also in the area of
    Inlet air inlet 9 is dispensed with internals or the like.
    Moreover, it can be seen in the figures that the upper front wall 12 or its inclined wall section 12b is arranged at a relatively acute angle α of less than 20 ° with respect to the vertical. In this way, the visual space can be increased compared to the prior art. The length X of the viewing zone along the longitudinal direction L of the classifier extends (essentially) from the upper edge 13 of the first supply air inlet 8 to the region of the lower end of the partition 15 arranged inside the classifier housing, which is shown in particular in FIG. 2. This partition 15 is based on that
    14/24 upper end of the classifier in a substantially vertical
    Orientation is arranged approximately in the middle of the classifier housing, specifically between the two side walls 4. Such a fundamentally known partition wall 15 leads to the fibers being guided to the air outlet 11 via this baffle. This partition 15 can be adjusted in a generally known manner along the longitudinal direction of the classifier, e.g. is pivotable about a horizontal axis 16. Alternatively or additionally, there is the possibility that the partition 15 can be adjusted or adjusted in height along the height direction H. The Y dimension with which the partition protrudes into the classifier housing can consequently be adjusted, and in this way the effectiveness of the separation with different tonnages can be adjusted and increased.
    Between the upper supply air inlet 8 and the lower one
    According to the invention, supply air inlet 9 has the lower front wall 17 arranged. This is curved and preferably convexly curved. The construction is realized in such a way that a support vortex 18 is formed in the interior between the first supply air inlet 8 and the second supply air inlet 9, which supports the first air flow Li entering through the first supply air inlet 8. The flow conditions are indicated schematically in FIG. 4, while FIG. 3 shows in simplified form the path of the fibers F on the one hand and of the coarse material G on the other. In this context, it is preferably provided that (at least) the second supply air connector 9a is designed to be inclined with increasing inclination relative to the horizontal, so that a second supply air flow L2 is generated which enters the interior of the safety housing in an inclined orientation with respect to the horizontal. In the illustrated embodiment, the upper air inlet 8a is also
    15/24 • · · · inclined against the horizontal, so that the first supply air flow Li enters the interior in an increasingly inclined orientation against the horizontal.
    1 that the supply air inlet 8 as well as the supply air inlet 9 and consequently also the corresponding supply air connections 8a and 9a extend (essentially) over the entire width B of the classifier housing 1. In contrast to the prior art, it is therefore not the case that a plurality of separate supply air lines are used across the width, but in each case one supply air line 8b or 9b is provided which extends over the entire width B of the classifier housing.
    The supply air inlet 8 and also the supply air inlet 9 preferably have a rectangular cross section. The same applies to the supply air connections 8a, 9a connected to the classifier housing. The supply air lines 8b, 9b can have a round cross section and can be connected to the supply air connections 8a, 9a via corresponding transition pieces 8c, 9c.
    Furthermore, it can be seen in FIG. 2 that the exhaust air line 11b, which is connected to the exhaust air outlet 11, has a deflection bend U or is designed as a deflection bend, specifically with a deflection angle β of approximately 180 °. A material switch 19 is connected to this deflection bend, which divides the fiber / air flow emerging from the air outlet 11 into a fiber / air flow on the one hand and an air flow on the other hand.
    Finally, it is indicated in the figures that additional baffles 20 can be arranged in the interior of the classifier housing. Compared to the prior art, such
    16/24
    However, built-in components in the classifier can be reduced so that the tendency to contamination can be reduced and the overall effectiveness of the classifier (in terms of separation quality and energy efficiency) can be optimized.
    17/24
    权利要求:
    Claims (11)
    [1]
    1. Sifter for separating coarse particles from a particle stream in the course of the production of wood-based panels, in particular wood fiber boards, with at least one sifter housing (1) which has at least one material inlet (5), a first supply air inlet (8) arranged below the material inlet (5) and has a second supply air inlet (9) arranged below the first supply air inlet (8), an exhaust air outlet (11) and a coarse material outlet (10), characterized in that the lower front wall (8) arranged between the first supply air inlet (8 and the second supply air inlet (9)) 17) of the sifter housing (1) is so curved or at least has a curved section that in the interior of the sifter housing between the first supply air inlet (8) and the second supply air inlet (9) there is a first one entering through the first supply air inlet (8) Airflow (Li) supporting support vortex (18).
    [2]
    2. Sifter according to claim 1, characterized in that the above the first supply air inlet (8) arranged upper front wall (12) of the sifter housing (1) is oriented at least in regions inclined against the vertical.
    [3]
    3. Sifter according to claim 1 or 2, characterized in that a (first) to the first supply air inlet (8)
    Supply air connection (8a) is connected, which is designed to be inclined with increasing inclination with respect to the horizontal and generates a first supply air flow (LJ) entering the interior in an inclined orientation with respect to the horizontal.
    18/24 ···· ··· ···
    [4]
    4. Sifter according to one of claims 1 to 3, characterized in that a second supply air connection (9a) is connected to the second supply air inlet (9), which is designed to be inclined to the horizontal and to be inclined to the horizontal in an increasingly inclined orientation Interior entering second supply air flow (L 2 ) generated.
    [5]
    5. Sifter according to one of claims 2 to 4, characterized in that the inclined upper front wall (12) or the inclined wall portion (12b) at an angle (α) of less than 20 °, preferably less than 15 ° to the vertical is.
    [6]
    6. Sifter according to one of claims 2 to 5, characterized in that the upper front wall (12) to the upper edge (13) of the first supply air inlet (8) adjoining curved guide wall section (12c), preferably convexly curved guide wall section.
    [7]
    7. Sifter according to one of claims 1 to 6, characterized in that the upper edge (13) of the first
    Inlet air inlet (8) is arranged in a side view in alignment over the lower edge (14) of the first inlet air inlet (8) or protrudes by an amount (M) over the lower edge.
    [8]
    8. Sifter according to one of claims 1 to 7, characterized in that the upper edge of the second supply air inlet (9) is arranged in a side view in alignment over the lower edge of the second supply air inlet (9) or protrudes by a dimension over the lower edge.
    19/24
    [9]
    9. Sifter according to one of the claims 1 to 8, characterized in that the first supply air inlet (8) and / or the second supply air inlet (9) (in each case) has / have a free inflow cross section without internals in the interior of the classifier housing.
    [10]
    10. Sifter according to one of claims 1 to 9, characterized in that the first supply air inlet (8) and / or the second supply air inlet (9) extends (in each case) continuously over substantially the entire width (B) of the classifier housing.
    [11]
    11. Sifter according to one of claims 1 to 10, characterized in that the lower front wall (17) is convexly curved or has at least one convexly curved section.
    Vienna, July 18, 2017
    类似技术:
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    同族专利:
    公开号 | 公开日
    CN107824449A|2018-03-23|
    DE102016117383A1|2018-03-15|
    US20180071784A1|2018-03-15|
    AT519034B1|2018-09-15|
    AT519034A3|2018-07-15|
    BR102017016926A2|2018-04-03|
    US10195646B2|2019-02-05|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102016117383.5A|DE102016117383A1|2016-09-15|2016-09-15|sifter|
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