• 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 grinding arrangement for grinding aqueous suspended cellulose fibers between two conical grinding surfaces (3, 4) which form a grinding gap (1) and move relative to one another with grinding strips (6) and grooves (7) running between them, wherein at least one grinding surface ( 3, 4) rotates around the cone axis and the grinding strips (6) on the corresponding conical grinding surface (3, 4) run with a directional component radial to the axis of rotation (10). Gentle and efficient grinding is to be achieved in that the side surfaces of the grinding bars (6) running perpendicular to the grinding gap (1) are each composed radially outward of several straight, angled sections and at least one grinding surface (3, 4) of several , milling sectors (8) arranged next to one another in the circumferential direction, the milling strips (6) of each milling sector (8) each running parallel to one another.
    公开号:AT16791U1
    申请号:TGM9003/2018U
    申请日:2018-08-14
    公开日:2020-09-15
    发明作者:Schmid Marcel；Schmid Martin
    申请人:Voith Patent Gmbh；
    IPC主号:
    专利说明:

    description
    CONICAL MAHLAN ARRANGEMENT
    The invention relates to a grinding arrangement for grinding aqueous suspended pulp fibers between two a grinding gap forming, relatively moving, conical grinding surfaces with grinding bars and grooves running between them, at least one grinding surface rotating about the cone axis and the grinding bars on the corresponding conical grinding surface with a directional component run radially to the axis of rotation.
    It has long been known to use pulp fibers, i. To grind fresh pulp and / or waste paper fibers in order to be able to achieve the desired properties, in particular with regard to strength, formation and surface, in the fibrous web produced therefrom.
    In the refiners that are usually used, the grinding strips are called knives and the grinding surfaces are formed by grinding sets.
    [0004] The refiners can be designed as disc refiners or, as discussed here, as cone refiners.
    In order to achieve the desired fiber properties, in particular the freeness, the grinding sets must be adapted as best as possible to the pulp to be treated, also in order to prevent excessive wear of the sets.
    However, this adaptation is problematic especially when treating waste paper fibers, since their proportion of long fibers can vary considerably.
    [0007] The object of the invention is therefore to ensure efficient and gentle grinding with as little wear as possible.
    According to the invention, the object was achieved in that the perpendicular to the grinding gap side surfaces of the grinding bars are each composed radially outward of several straight, mutually angled sections and at least one grinding surface consists of several, circumferentially juxtaposed grinding sectors, the grinding bars each Milling sector, ie the opposite side surfaces of adjacent grinding bars each run parallel to one another.
    Since at least the majority of the grinding bars extend radially as far as possible over the entire grinding surface without interruption, eddies which convey the pulp into the grinding gap can better form in the grooves.
    Furthermore, this makes it possible to align the grinding strips of each grinding sector so that there is as little deviation as possible from the optimal cutting angle of the same, which leads to gentle grinding with a particularly efficient increase in fiber strength.
    The cutting angle is formed by the two grinding edges of the grinding strips sweeping over the opposing grinding surfaces during their relative movement.
    [0012] In addition, this allows narrow grinding strips and thus an increase in the length of the cutting edge.
    In order to make full use of this, both grinding surfaces should consist of several grinding sectors arranged next to one another in the circumferential direction, the grinding strips of each grinding sector running parallel to one another.
    It has proven to be optimal if the grinding sectors extend over 2 to 5 ° of the circumference of the corresponding grinding surface.
    The boundary line of the grinding sectors in the circumferential direction should run radially outwards in a sawtooth shape. Specifically, this means that the boundary line extends along the straight section of the outer grinding bars and over the kinks of the grinding bars of the grinding
    sector extends.
    The width of the grinding strips is advantageously constant and is preferably between 1.2 and 1.5 mm. The width of the grooves should also be at least predominantly constant. As a result, this allows the cutting edge length to be maximized.
    In general, but especially in cases in which only one grinding surface rotates, a constant groove width supports the increase in the speed of the fiber suspension from the inside to the outside.
    In order to be able to keep the groove width largely constant despite the radially outward widening of the grinding surface, it is possible to arrange additional grinding strips whose radially inner end is significantly further away from the axis of rotation than that of the majority of grinding strips. In addition or as an alternative, however, some of the grinding strips can also share radially outwards.
    To ensure sufficient conveying capacity, the grinding gap should form an angle between 20 and 35 ° with the axis of rotation of the grinding surface.
    Advantages in construction and assembly arise when the grinding surface is each formed by several, releasably attached grinding segments, each comprising 3 to 5 grinding sectors and / or extending over 6 to 18 ° of the circumference of the corresponding grinding surface.
    For the purpose of improving the conveying capacity and a smoother transition with regard to the open area, it is advantageous if the ends of the grinding bars at the radially inner end of at least one, preferably both grinding surfaces, are at different distances from the axis of rotation.
    It has been found to be optimal if the distance between the ends of the grinding strips and the axis of rotation in the circumferential direction increases and decreases periodically, preferably in several stages.
    The cut area of intersecting grinding bars, often also referred to as Jagenberg area, amounts to a total of about 6-15% of the total grinding area and essentially influences the hydraulic counterforce in the grinding gap.
    According to the requirements and circumstances, it can be advantageous if both grinding surfaces rotate about the same axis of rotation in opposite directions or at different speeds in the same direction or if only one grinding surface rotates.
    The invention will be explained in more detail below using several exemplary embodiments. In the attached drawing shows:
    FIG. 1: a schematic cross section through a conical refiner; FIG. 2: a grinding segment;
    FIG. 3: a detail according to FIG. 2;
    FIG. 4: another grinding segment;
    Figure 5: a section of a further grinding segment and
    [0031] FIG. 6: another section of a further grinding segment.
    In the housing 2 of the grinding arrangement, according to FIG. 1, a grinding gap 1 is formed by a stationary grinding surface 3 coupled to the housing 2 and a grinding surface 4 rotating about an axis of rotation 10.
    The axis of rotation 10 coincide with the cone axis and the two conical grinding surfaces 3, 4 run parallel to one another, the distance between them usually being adjustable.
    The direction of flow of the pulp suspension takes place in the axial as well as in the radial direction, since the milling gap 1 forms an angle between 20 and 35 ° with the axis of rotation 10 of the milling surface 3, 4.
    The rotating, radially inner grinding surface 4 is moved in the direction of rotation 12 by a shaft 11 rotatably mounted in the housing 2. This shaft 11 is driven by a drive also present in the housing 2.
    In the example shown here, the fiber suspension to be ground arrives via an inlet 13 through the center into the grinding gap 1 between the two grinding surfaces 3, 4.
    The fiber suspension passes the interacting grinding surfaces 3, 4 radially outwards and leaves the adjoining annular space through an outlet 14.
    Not shown are the known means with which a force is generated in order to press the two grinding surfaces 3, 4, also called grinding sets, against one another.
    Both grinding surfaces 3, 4 are each formed by a plurality of grinding segments 5, which each extend over a circumferential area between 6 and 18 ° of the corresponding grinding surface 3, 4 and are supported on a support surface 15, 16 running parallel to the grinding gap 1 and with this are releasably connected.
    Lined up next to one another in the circumferential direction, the grinding segments 5 result in a continuous grinding surface 3, 4.
    The grinding segments 5 and thus also the grinding surfaces 3, 4, as shown in FIGS. 2 to 6, are formed by a multiplicity of radially extending grinding strips 6 and grooves 7 in between.
    The cross section of the grinding bars 6, also called knife, is generally rectangular, but there are also other shapes. For a maximum cutting edge length, the width of the grinding strips 6 is constant and relatively small in the range between 1.2 and 1.5 mm.
    The grooves 7 running between the grinding bars 6 also have a rectangular cross section and serve as flow channels for the fiber suspension. The groove depth is usually between 2 and 20 mm.
    It is essential to the invention that the side surfaces of the grinding bars 6 running perpendicular to the grinding gap 1 are each composed radially outward of several straight, mutually angled sections. Furthermore, both grinding surfaces 3, 4 consist of several grinding sectors 8 arranged next to one another in the circumferential direction, the grinding strips 6 of each grinding sector 8 each running parallel to one another.
    While the continuous grinding strips 6 enable efficient and homogeneous grinding, the large number of grinding sectors 8 ensures a small deviation from the optimal cutting angle.
    The cutting angle is obtained when the grinding edges of the grinding strips 6, which are axially opposite with respect to the axis of rotation 10, are moved past one another during the rotation of the grinding surface 4.
    The grinding sectors 8 extend over 2 to 5 ° of the circumference of the corresponding grinding surface 3, 4, so that each grinding segment 5 comprises three to five grinding sectors 8.
    As indicated in FIGS. 2, 4 and 5, the boundary line 9 between the grinding sectors 8 extends in a sawtooth shape radially outward. The boundary line 9 runs along the straight sections of the side face of the corresponding, outer grinding bar 6 of the respective grinding sector 8 and over the kinks 18 of the grinding bars 6 leaving the grinding sector 8.
    In order to reduce wear in the inlet area of the grinding surface and to make the transition in the open area more gradual, in the embodiments shown in FIGS. 4 and 6, the ends of the grinding strips 6 at the radially inner end of both grinding surfaces 3, 4 are below.
    at different distances from the axis of rotation 10.
    For this purpose, the distance between the ends of the grinding strips 6 and the axis of rotation 10 in the circumferential direction periodically increases and decreases in one step in FIG. 4 and in several steps in FIG. 6.
    The arrow-shaped inlet according to FIG. 6 makes it possible to create a very gradual transition into the grinding area, which has a corresponding effect on the wear and tear and the conveying capacity.
    To maximize the length of the cut edge, it is just as important to keep the width of the grooves 7 at least predominantly constant. In order to achieve this with the grinding sector 8 widening radially outward, additional grinding strips 6, in which the radially inner end is significantly further away from the axis of rotation 10 than in the other grinding strips 6, help.
    While the grinding strips 6 described so far extend radially approximately over the entire grinding surface 3, 4, the additional grinding strips 6, as shown in FIG. 5, are limited to a radially outer section of the grinding surface 3, 4. If the additional grinding bars 6 are very short, they can also do without a kink 18 and only have a straight section.
    Alternatively, FIGS. 2, 3 and 4 show a possibility of compensating for the widening due to the grinding surface 3, 4 in that some of the grinding bars 6 divide radially outward.
    The location of the division varies with regard to its distance from the axis of rotation 10. A multiple division of a grinding bar 6 radially one behind the other is also possible.
    As a result, the turbulence emanating from the division of the grinding bars 6 in the pulp suspension and the associated wear effects on the grinding bars 6 are distributed relatively evenly over the entire grinding surface 3, 4.
    For example, the distance between the division and the axis of rotation 10 in the circumferential direction of the grinding surface 3, 4 can increase continuously in small steps, so that the divisions adjacent in the circumferential direction run in a spiral. This contributes significantly to the equalization.
    According to FIG. 3, the distance between the dividing grinding strips 6 in a dividing section 17 following the division increases steadily radially outward.
    In order to increase the stability, the opening gap of the dividing section 17 could indeed be filled with material, but the advantages of an increased cutting edge length outweigh this.
    The length of the dividing section 17 is between 10 and 50 mm.
    To achieve the greatest possible cutting edge length, the grinding strips 6 run parallel outside of the dividing sections 17.
    For the same reason, after the division of a grinding bar 6 and a dividing section 17 following the division, one of the two divided grinding bars 6 runs in a curved manner.
    In the interest of an optimal and uniform effect of the grinding surface 3, 4, the width of all grinding bars 6 and all grooves 7 outside of the division sections 17 following a division is the same size.
    In FIG. 2, the grinding surface 3, 4 is used extensively, which is why the radially inner end of all grinding strips 6 of both grinding surfaces 3, 4 is equidistant from the axis of rotation 10.
    权利要求:
    Claims (14)
    [1]
    1. Grinding arrangement for grinding aqueous suspended cellulose fibers between two conical grinding surfaces (3, 4) which form a grinding gap (1) and move relative to one another with grinding strips (6) and grooves (7) running between them, with at least one grinding surface (3) rotates around the conical axis and the grinding bars (6) on the corresponding conical grinding surface (3, 4) run with a directional component radial to the axis of rotation (10), characterized in that the side surfaces of the grinding bars (1) running perpendicular to the grinding gap (1) 6) each put together radially outward from several straight, angled sections and at least one grinding surface (3, 4) consists of several grinding sectors (8) arranged next to one another in the circumferential direction, the grinding bars (6) of each grinding sector (8) being parallel to one another run away.
    [2]
    2. Grinding arrangement according to claim 1, characterized in that both grinding surfaces (3, 4) consist of several grinding sectors (8) arranged next to one another in the circumferential direction, the grinding strips (6) of each grinding sector (8) running parallel to one another.
    [3]
    3. Grinding arrangement according to claim 1 or 2, characterized in that the grinding sectors (8) extend over 2 to 5 ° of the circumference of the corresponding grinding surface (3, 4).
    [4]
    4. grinding arrangement according to one of the preceding claims, characterized in that the boundary line (9) of the grinding sectors (8) extends in the circumferential direction in a sawtooth shape radially outward.
    [5]
    5. Grinding arrangement according to one of the preceding claims, characterized in that the ends of the grinding strips (6) at the radially inner end of at least one grinding surface (3, 4) are at different distances from the axis of rotation (10).
    [6]
    6. Grinding arrangement according to one of the preceding claims, characterized in that the ends of the grinding strips (6) at the radially inner end of both grinding surfaces (3, 4) are at different distances from the axis of rotation (10).
    [7]
    7. grinding arrangement according to claim 5 or 6, characterized in that the distance between the ends of the grinding strips (6) and the axis of rotation (10) in the circumferential direction periodically, preferably in several stages, increases and decreases again.
    [8]
    8. grinding arrangement according to one of the preceding claims, characterized in that the width of the grinding strips (6) is constant and is preferably between 1.2 and 1.5 mm.
    [9]
    9. grinding arrangement according to one of the preceding claims, characterized in that the grinding gap (1) forms an angle between 20 and 35 ° with the axis of rotation (10) of the grinding surface (3, 4).
    [10]
    10. Grinding arrangement according to one of the preceding claims, characterized in that the grinding surface (3, 4) is in each case formed by a plurality of releasably attached grinding segments (5) which each comprise 3 to 5 grinding sectors (8).
    [11]
    11. grinding arrangement according to 10, characterized in that the grinding segments (5) extend over 6 to 18 ° of the circumference of the corresponding grinding surface (3, 4).
    [12]
    12. Grinding arrangement according to one of the preceding claims, characterized in that the width of the grooves (7) is at least predominantly constant.
    [13]
    13. Grinding arrangement according to one of the preceding claims, characterized in that in some grinding bars (6) the radially inner end is significantly further away from the axis of rotation (10) than that of the majority of the grinding bars (6).
    [14]
    14. Grinding arrangement according to one of the preceding claims, characterized in that some of the grinding strips (6) share radially outward.
    For this purpose 2 sheets of drawings
    类似技术:
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    DE102019104105B3|2020-06-18|Grinding set segment
    DE102008039004A1|2010-02-25|Water-suspended cellulose fibers e.g. fresh cellulose fibers, refining method, involves providing channels between refining blocks of refining devices, where channel depth increases or decreases from outwards to inwards in radial direction
    DE212010000171U1|2012-06-26|Disperger IV
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    DE1243507B|1967-06-29|Kegelstoffmuehle
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    同族专利:
    公开号 | 公开日
    CN212925594U|2021-04-09|
    FI12655U1|2020-05-15|
    DE102017120162A1|2019-03-07|
    DE212018000303U1|2020-05-15|
    WO2019042758A1|2019-03-07|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US20100314476A1|2007-11-30|2010-12-16|Metso Paper, Inc.|Refiner|
    DE102008059610A1|2008-11-28|2010-06-02|Voith Patent Gmbh|Process for grinding aqueous suspended pulp fibers and grinding sets for its implementation|
    DE102015223027A1|2015-11-23|2017-05-24|Voith Patent Gmbh|grinding set|
    DE102015202318A1|2015-02-10|2016-08-11|Voith Patent Gmbh|grinding set|DE102019132448A1|2019-11-29|2021-06-02|Voith Patent Gmbh|Pulp treatment device|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102017120162.9A|DE102017120162A1|2017-09-01|2017-09-01|Conical grinding arrangement|
    PCT/EP2018/071993|WO2019042758A1|2017-09-01|2018-08-14|Conical refining assembly|
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