• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A screw press for separating liquids from a suspension, in particular a sludge or pulp suspension, has at least one screw shaft (2) rotating in a cylindrical or conical casing (1), the coil (3) of which separates the suspension by one between the casing (1) and the screw shaft (2) formed annular gap (4) promotes. At least the jacket (1) or the worm shaft (2) are perforated. The coil (3) has one, with the worm shaft (2) connected to the base body (5) and is made of several parts. The front side of the helix (3) facing in the conveying direction (6) is at least predominantly formed by a ceramic element (7) which is fastened to a supporting body (8) of the helix (3). The ceramic element (7) forms the cutting edge (9) between the front side and the upper side of the coil (3) facing the shell (1) and covers the supporting body over at least part of the upper side from this cutting edge (9). 8th).
    公开号:AT14550U1
    申请号:TGM50083/2014U
    申请日:2014-06-02
    公开日:2016-01-15
    发明作者:Volker Niggl；Gert Gottschalk；Werner Brettschneider
    申请人:Voith Patent Gmbh；
    IPC主号:
    专利说明:

    description
    SCREW PRESS
    The invention relates to a screw press for separating liquids from a suspension, in particular a sludge or pulp suspension with at least one, rotating in a cylindrical or conical shell screw shaft, the helix of the suspension through an annular gap formed between the shell and the worm shaft promotes, wherein at least the shell or the worm shaft are perforated and the helix has one, connected to the worm shaft body and is made of several parts.
    Such dewatering devices are known for a long time and are used with success especially in the thickening of pulp suspensions in machines for producing a fibrous web.
    In this case, a driven screw conveyor is arranged within a substantially concentric cylindrical or conical, perforated metal jacket or the like. The radially added suspension is dehydrated in cooperation with a damming device, whereby the water can escape through the perforated metal jacket or the like, while the rejects are retained.
    The compression and drainage of the reject is improved when a conical shape is selected for the metal jacket whose diameter decreases in Rejectlaufrichtung, of course, the outer screw diameter must be adapted to these geometric conditions.
    If the known dewatering screws performed as described, they are exposed due to the intense friction between the reject and the components of the machine a particularly large wear. Namely, there is a considerable relative movement at the same time enormous axial and radial forces between the already heavily thickened fabric and the components instead. In addition, this reject contains - in addition to a residue of fibers - often many small metal parts and hard plastic pieces, which experience has led to high wear and high quality metallic components, especially the helix.
    The object of the invention is therefore to extend the life of the screw presses by an improved wear protection of the helix.
    According to the invention this object is achieved in that the pointing in the conveying direction front side of the helix is at least predominantly formed by a ceramic element which is attached to a supporting body of the helix, the cutting edge between the front and the jacket facing top of the helix forms and covered by this cutting edge of at least a portion of the top of the support body.
    The ceramic element is very resistant to wear, which greatly increases the service life of the helix. The cutting edge itself is also formed by the ceramic element, thus ensuring a consistently high consistency over the entire operating time.
    Therefore, the cutting edge should form an angle between the front and top between 75 and 90 °. An angle of less than 90 ° may allow a low-wear transition to the support element, but stability must be taken into account.
    In addition, it is counteracted by the covering of the support body on the upper side wear of the support body on the contact surface to the ceramic element.
    Particularly simple design, if the support body is formed by the main body itself.
    However, a better adaptation to the specific tasks of the elements is possible when the support body between the base body and the ceramic element is arranged and preferably releasably secured to the base body. The detachable connection is usually by means of
    Screws and allows easy replacement of the support body as needed.
    While the welded to the worm shaft body is usually made of metal, the support body should advantageously consist of fiber-reinforced plastic. The associated elasticity of the body can absorb pressure surges on the ceramic element and also allows a positive connection of the ceramic element on the support body, for example via a dovetail joint.
    Furthermore, the support body should have deformable spacers on the underside pointing toward the worm shaft, which spacers are pressed in the direction of the worm shaft during attachment of the support element to the base body and thus generate a prestress.
    In order to protect the highly loaded, pointing in the conveying direction front side of the coil as extensively from wear, the ceramic element should form the entire front side of the coil except for a small annular gap to the worm shaft.
    In the interest of a wear-resistant design of the top of the coil should at least one third, preferably at least half of the top of the helix are formed by the ceramic element and / or the ceramic element of the cutting edge against the conveying direction over at least 10 mm, preferably at least 15 mm.
    The load of the support body on the top can also be reduced by the fact that the distance between the, formed by the support body top of the helix and the axis of the worm shaft decreases against the conveying direction.
    The invention will be explained in more detail with reference to an embodiment. In the attached drawing: FIG. 1 shows a schematic cross section through a screw press; 2 shows a partial view of the front side of the helix 3 and [0021] FIGS. 3a-3e show a cross section through different helixes 3 of the worm shaft 2.
    The screw press shown in Figure 1 is used for dewatering a frequently formed at least partially from waste paper pulp suspension, as required for producing a fibrous web.
    For this purpose, the screw press has a, in a cylindrical and perforated shell 1 concentrically arranged and rotatably mounted worm shaft 2, wherein the suspension of the helices 3 of the worm shaft 2 formed by an annular gap 4 formed between the shell 1 and the worm shaft 2 of at least one Inlet 13- is pressed to an outlet opening 14.
    The suspension is dewatered as it passes through the annular gap 4 both by gravity and by taking place during transport compression. In this case, the water passes through the screen openings of the shell 1 in a drainage box with a drain 15. This drainage box collects the collected water and is here exemplified in the jacket 1 surrounding the housing 16 integrated.
    In order to intensify the drainage, the worm shaft 2 is formed and arranged conically such that the annular gap 5 gradually decreases in the conveying direction 6.
    After passing through the annular gap 4, the thickened suspension reaches the region of the outlet opening 14.
    The worm shaft 2 is driven by a motor 17, wherein a transmission, a belt o.ä. can be switched in between.
    In contrast to Figure 1, the screw press can also be arranged obliquely or vertically.
    To create a very wear-resistant helix 3 of the screw shaft 2, this is performed in several parts according to Figures 2 and 3a-e. Connected to the metallic base body 5, which is welded to the tendon shaft 2, in the conveying direction 6 of the worm shaft 2, is a support body 8 made of fiber-reinforced plastic fastened to the base body 5 via screws 18.
    This support body 8 has on the underside facing the worm shaft 2 deformable spacers 10 which are pressed together when tightening the support body 8 on the base body 5 and thus ensure a secure fit of the support body 8.
    In order to increase the operating time of the coil 3, the facing in the conveying direction 6 front side of the coil 3 is formed to a very narrow annular gap 11 to the worm shaft 2 out of a ceramic element 7.
    The ceramic element 7 is connected via a dovetail connection form-fitting manner with the support body 8 and additionally glued to this. The bond also counteracts penetration of suspension into the gap between the ceramic element 7 and support body 8.
    By the ceramic member 7 also results in a very wear-resistant cutting edge 9 between the front and facing the shell 1 top of the coil. 3
    This cutting edge 9 forms in Figure 3a, b, d and e an angle between the front and top of 90 °, which allows a stable design of the ceramic element 7.
    In Figure 3a, the top of the ceramic element 7 is just above the support body 8. Only with sufficient distance to this transition, the distance between the top of the coil 3 formed by the support body 8 and the axis 12 of the worm shaft 2 decreases in one jump. Thus, the support of the ceramic element 7 is improved in the upper region.
    In contrast, the distance reduction of the top of the support body 8 to the axis 12 of the screw shaft 2 takes place continuously in Figure 3e, which somewhat weakens the support of the ceramic element 7, but improves the transition ratios.
    Figure 3d shows a sudden reduction in the distance between the top and the axis 12 of the screw shaft 2 at the transition between the ceramic element 7 and T ragkörper eighth
    In contrast, in Figures 3b and 3c, the distance between the top of the ceramic element 7 and the axis 12 of the worm shaft 2 is entirely continuous, i. With an angle of about 80 ° between the front and top side (Figure 3c) or continuously in the counter to the conveying direction 6 lying end portion of the ceramic element 7 (Figure 3b) is reduced.
    Furthermore, the ceramic element 7 extends from the cutting edge 9 counter to the conveying direction 6 over at least 10 mm, which allows an overlap of the supporting body 8 from the cutting edge 9 over a part of the top. This also makes the top more resistant to wear and counteracts wear of the support body 8 in the contact region to the ceramic element 7.
    权利要求:
    Claims (12)
    [1]
    Claims 1. Screw press for separating liquids from a suspension, in particular a sludge or pulp suspension with at least one, in a cylindrical or conical jacket (1) rotating worm shaft (2) whose coil (3), the suspension through, between the jacket (1) and the worm shaft (2) formed annular gap (4) promotes, wherein at least the shell (1) or the worm shaft (2) are perforated and the coil (3), one connected to the worm shaft (2) main body (5) has and is made of several parts, characterized in that in the conveying direction (6) facing front side of the coil (3) at least predominantly of a ceramic element (7) is formed, which on a support body (8) of the coil (3) is attached, which Cutting edge (9) between the front and the jacket (1) facing top of the coil (3) and from this cutting edge (9) over at least part of the top of the support body ( 8) covered.
    [2]
    2. screw press according to claim 1, characterized in that the supporting body (8) from the base body (5) is formed.
    [3]
    3. screw press according to claim 1, characterized in that the supporting body (8) between the base body (5) and the ceramic element (7) and preferably on the base body (5) is releasably attached.
    [4]
    4. screw press according to claim 3, characterized in that the supporting body (8) consists of fiber-reinforced plastic.
    [5]
    5. screw press according to one of claims 3 or 4, characterized in that the supporting body (8) on the worm shaft (2) facing lower deformable spacer (10).
    [6]
    6. screw press according to one of the preceding claims, characterized in that the ceramic element (7) is positively secured to the support body (8).
    [7]
    7. screw press according to one of the preceding claims, characterized in that the ceramic element (7) except for a small annular gap (11) to the worm shaft (2) towards the entire front side of the coil (3).
    [8]
    8. screw press according to one of the preceding claims, characterized in that the cutting edge (9) forms an angle between the front and top of 90 °.
    [9]
    9. screw press according to one of claims 1 to 7, characterized in that the cutting edge (9) forms an angle between the front and top of less than 90 °, preferably between 75 and 90 °.
    [10]
    10. screw press according to one of the preceding claims, characterized in that at least one third, preferably at least half of the upper side of the coil (3) from the ceramic element (7) is formed.
    [11]
    11. screw press according to one of the preceding claims, characterized in that the ceramic element (7) of the cutting edge (9) against the conveying direction (6) over at least 10 mm, preferably at least 15 mm.
    [12]
    12. screw press according to one of the preceding claims, characterized in that the distance between the, from the support body (8) formed upper side of the coil (3) and the axis (12) of the worm shaft (2) counter to the conveying direction (6) decreases. For this 2 sheets of drawings
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    同族专利:
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    CN204249388U|2015-04-08|
    FI10647U1|2014-10-10|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE4214217A1|1992-04-30|1993-11-04|Fan Engineering Gmbh|Wearing elements attachment device to liq.-solid screw press separator screws - comprises wearing elements in form of angles shaped to suit and attached to screw vanes and tapering to screw axis, for waste paper residue and cattle slurry|
    US5845764A|1994-02-01|1998-12-08|Ommundsen; Dag|Wear element for screw presses or the like|
    US5429581A|1994-03-07|1995-07-04|Dorr-Oliver Incorporated|Wear-resistant tile surfacing for a centrifuge conveyor|
    WO2000030840A1|1998-11-19|2000-06-02|Kvaerner Pulping A.S|Method for dressing worn blades in a screw press|
    WO2007128017A1|2006-05-08|2007-11-15|Andritz Ag|Support with wearing parts for screw presses|
    AT518550B1|2016-07-29|2017-11-15|Andritz Ag Maschf|screw Press|
    法律状态:
    2018-02-15| MM01| Lapse because of not paying annual fees|Effective date: 20170630 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102013213668|2013-07-12|
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