• 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:
    lO ABSTRACT The inVention relates to a screw conVeyor (l) for lignocellulose containing material, whichscrew conVeyor (l) comprises a housing (2), an inlet (7), an outlet (8) and a screw (3) fortransporting the lignocellulose containing material through the housing (2) from the inlet (7)to the outlet (8), which screw (3) comprises a screw thread (4), a screw core (5) and an axis(6). According to the inVention the inlet (7) has an axial length (L) along the axis (6) of thescrew (3); in that the screw thread has a depth (d); in that the screw has an axial speed (V2);in that the lignocellulose containing material has an incoming speed (V1) at the i11let (7); andin that the axial length (L) of the inlet (7) is equal to or larger than the depth (d) of thescrew thread (4) times the quotient between the axial speed (V2) of the screw (3) and the incoming speed (V1) of the lignocellulose containing material at the inlet (7). Fig. la
    公开号:SE1350215A1
    申请号:SE1350215
    申请日:2013-02-22
    公开日:2014-08-23
    发明作者:Stefan Mellander；Peter Svedberg
    申请人:Valmet Oy；
    IPC主号:
    专利说明:

    lO SCREW CONVEYOR FORLIGNOCELLULOSE CONTAINING MATERIAL TECHNICAL FIELDThis invention relates to a screw conveyor for lignocellulose containing material.BACKGROUND A screw conveyor is a device that uses a rotating helical screw blade, usually within ahousing to move material in several places in the cellulose industry, based on the principlesof the Archimedean screw. It is also known as eg. an auger conveyor, spiral conveyor or WOITII COIIVCYOT.
    A screw feeder is very similar to a screw conveyor in its basic structure, but alsocompresses the material. The screw feeder comprises a conically shaped housing with ascrew having a continuous screw thread for advancing the material through the housingwhile simultaneously compressing the material. Screw feeders of this kind are used in thecellulose industry in places where an air-tight material plug is desired for rendering itpossible to feed the material against a high pressure (e. g. liquid column and gas pressure).Such screw feeders, thus, are often used for feeding lignocellulose containing material into an impregnation vessel or digester. The screw feeder may also dewater the material.
    Today there is a problem that the screw conveyors and screw feeders are not operatingcompletely filled. Historically, control of the screw has been made by controlling therotational speed or the axial speed of the screw. The result is, however, in practise, that thescrew will operate less filled the higher the rotational speed or axial speed is. Thus, theproduction capacity is not increased as wished by the increase in rotational speed or axial speed. lO SUMMARY An object of the invention is to provide an improved screw conveyor that solves the problem in prior art. This object is achieved in accordance with the appended clairns.
    The advantages are that an existing screw conveyor may be filled more by a simple changeand that thus the production capacity of said screw conveyor may be increased. Thus, asmaller apparatus may be used than earlier to obtain the same production capacity, which makes it cheaper.
    When the invention is used in a screw feeder, since the screw feeder operates more filled,the compaction degree will also be higher, which leads to a smaller risk that the material rotates with the screw and also to an increased dewatering.
    BRIEF DESCRIPTION OF THE DRAWINGS The invention, together with further objects and advantages thereof, may best be understood by reference to the following description and appended drawings, in which: Fig. la-b are a side cross section view and a top cross section view illustrating a screwconveyor in the form of a screw feeder, according to a first embodiment of the invention.Fig. 2a-b are two side cross section views illustrating a screw conveyor in the form of a screw feeder, according to a second embodiment of the invention.
    DETAILED DESCRIPTION In the drawings, similar or corresponding elements are denoted by the same reference numbers.
    In Fig. 1 is shown a screw conveyor 1 in the form of a screw feeder 1, comprising a conicalhousing 2 and a screw 3, in the form of a feed screw 3, with a continuous screw thread 4, ascrew core 5, flanks 15, a screw periphery 16 and an axis 6. The screw thread 4 has a pitchp (between the flanks 15) and a depth d (between the screw periphery 16 and the screw core 5). The screw 3 is driven by a motor and a gear box (not shown) at a rotational speed lO n and an axial speed V2, which may be Varied. The axial speed V2 is defined as how fast a flank 15 of the screw thread 4 seems to move axially.
    Lignocellulose containing material is supplied through an inlet 7, which has an axial length Lalong the axis 6 of the screw 3. The lignocellulose containing material may e.g. come from aprevious screw conVeyor and reaches the inlet 7 at an incoming speed V1. The lignocellulosecontaining material may simply fall down through a chute 10 (schematically shown in Fig. 2a and 2b) of a height h to the i11let 7 and reach the inlet 7 at a falling speed VF.
    The lignocellulose containing material is then discharged in the form of a plug through anoutlet 8, e. g. to a pressurised Vessel, like a ref1ner or preheater. The lignocellulose materialmay be dewatered by the compression and if the housing 2 has holes, then the liquid possibly pressed out by the compression may be collected in a liquid casing 9.
    According to the inVention it has been realised that it doesn°t matter if the rotational speed nor axial speed V2 is increased, because that will also decrease the time aVailable to fill thescrew. HoweVer, by changing other parameters, a higher rotational speed/axial speed may be used and the screw will still become filled, which will be explained in the following: If the lignocellulose containing material is considered as a conti11uum, then each point of thescrew 3 should be exposed to the continuum a certain time in order to fill that point of thescrew 3 to the screw periphery 16 of the screw 3. The time that this point should beexposed is dependent on the axial speed V2 of the screw 3, the incoming speed V1 of the continuum at the i11let 7, the depth d of the screw 3 and the axial length L of the inlet 7.
    According to the inVention, the following relationship has been realised in order for the screw to operate filled:T2 2T1 (1)Tl I d/V1 T2 = L/V2 (3) lO where d = the depth of the screw at the inlet, V1 = the speed of the incoming material at theinlet, L = the axial length of the inlet along the axis of the screw, V2 = the axial speed of the screw.
    The axial speed V2 of the screw may be calculated as: V2 I ITP (4)where n = the rotational speed of the screw and p = the pitch of the screw.
    If the lignocellulose containing material falls freely, without too much air resistance, e.g.down a chute to the screw feeder, then the incoming speed of the lignocellulose containingmaterial may be calculated as: V1 = VF = (5)where g is the graVitational acceleration and h is the fall height of the chute.
    Equation (l) may also be expressed as: L/Vg 2 d/Vl -> L 2 d-Vg/Vl (6) This means that also an existing screw feeder l may operate more filled by a simple change,i.e. by haVing a larger axial length L of the i11let 7. With a larger axial length L of the i11let 7according to equation (6), it is thus possible to increase the rotational speed/axial speed ofthe screw 3 and still get a filled screw 3. Thus, the production capacity of said screw feederl may be increased in a Very simple way. A smaller screw feeder l may, hence, be used than in earlier applications and still obtain the same production capacity, which makes it cheaper.
    Since the screw feeder l operates more filled, the compaction degree will also be higher,which leads to a smaller risk that the material rotates with the screw and also to an increased dewatering.
    A risk with haVing a larger axial length L of the inlet 7 of the screw feeder l, is that there will be a larger area onto which the incoming lignocellulose containing material is to lO distributed and thus the lignocellulose containing material might be distributed unevenly in the screw 3.
    In Fig 2 is shown an embodiment with a number of means 7, 11, 12, 13, 14, which may beused independently of each other for distributing the lignocellulose containing material moreevenly. The inlet 7 is preferably diverging towards the screw 3 for improved distribution. Inthis context the last part of the chute 10, if any, may also be considered as part of the inlet7.
    Further, the inlet 7 is preferably divided into at least two axial compartments 11 by at leastone transverse plate 12. The at least one transverse plate 12 may go alrnost all the waydown to the screw 3 or there may be a larger gap to the screw 3. Preferably, the at least onetransverse plate 12 only covers the inlet 7 partially, in order to decrease the risk that thelignocellulose containing material will get stuck. For the same reason, the at least onetransverse plate 12 also preferably has an edge 13 that is not horizontal, but oblique and inclined downwards.
    Further, the inlet 7 preferably also comprises a vibrator 14 for even distribution of the lignocellulose containing material.
    Even though this description has only covered screw feeders, the invention is applicable alsoin other types of screw conveyors with or without compression and with or withoutdewatering. In this description, the term “screw conveyor” is used as a general conceptcovering all types of screw conveyors, screw feeders, auger conveyors, auger feeders, spiralconveyors, worrn conveyors, helix conveyors or other arrangements building on the principle of Archimedes” screw.
    Also in other aspects, the invention is of course not restricted to the shown ernbodirnents, but may be varied within the scope of the claims.
    权利要求:
    Claims (1)
    [1] 1. /2
    类似技术:
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    同族专利:
    公开号 | 公开日
    SE537758C2|2015-10-13|
    EP2959055A4|2016-11-16|
    EP2959055A1|2015-12-30|
    WO2014129958A1|2014-08-28|
    US20150375942A1|2015-12-31|
    US9434551B2|2016-09-06|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB816285A|1958-01-02|1959-07-08|Hermann Gewecke|Manufacture of constructional materials from wood chips|
    US837010A|1905-10-27|1906-11-27|C F Wigand|Grain-drier.|
    US2662634A|1950-10-16|1953-12-15|Hubert A Tintes|Auxiliary conveyer extension|
    IL23013A|1964-03-02|1969-04-30|Ernst W|Method of and apparatus for manufacturing heat insulating material|
    US3312329A|1964-03-24|1967-04-04|Marshall F Hokana|Conveyor feeder system|
    US3802584A|1972-02-18|1974-04-09|Sackett & Sons Co A J|Conveyor system|
    DE2714993C3|1977-01-24|1979-08-16|Stake Technology Ltd., Ottawa|Method for introducing a fiber material into a pressure vessel|
    CA1153287A|1981-05-08|1983-09-06|Arthur J. Hunt|Screw press with continuous slope feed screw|
    US5205695A|1989-06-22|1993-04-27|Kabushiki Kaisha Plantec|Refuse storage equipment|
    JP3113418B2|1992-10-28|2000-11-27|スギウエエンジニアリング株式会社|Screw conveyor|
    SE507367C2|1996-09-19|1998-05-18|Sunds Defibrator Ind Ab|plug screw feeder|
    AT406847B|1998-02-10|2000-09-25|Andritz Patentverwaltung|METHOD FOR REGULATING A SCREW PRESS|
    CA2505628C|2003-03-19|2007-12-18|Varco I/P, Inc.|Apparatus and method for moving drilled cuttings|
    JP2005138919A|2003-11-04|2005-06-02|Plibrico Japan Co Ltd|Continuously blending and mixing volumetric feeder for refractory material|
    US20090022570A1|2007-07-16|2009-01-22|Joe David Craig|System, method and apparatus for feeding biomass into a pressurized vessel|
    JP5483589B2|2010-09-01|2014-05-07|株式会社神戸製鋼所|Reduced iron material supply system|
    CA2759110C|2010-11-18|2018-09-25|Service D'equipement G.D. Inc.|Spreader assembly for vehicles and method for spreading granular materials|CN105712042A|2016-04-15|2016-06-29|李奇峰|Spiral conveyer|
    TWI639403B|2017-04-13|2018-11-01|美商凱亞科技股份有限公司|Coffee bean conveyance device|
    CN107444858A|2017-07-03|2017-12-08|浙江划云数据技术有限公司|A kind of extruding conveying integrated device with multiple discharging openings|
    DE202018101651U1|2018-03-16|2018-04-09|Seepex Gmbh|Plant for conveying pasty material|
    US11117338B2|2018-05-11|2021-09-14|Easyquip Pty Ltd.|Waste material compactor|
    US10486383B1|2018-12-18|2019-11-26|V.Y.F. Express Inc.|Screw press having screen vibration|
    US10343847B1|2018-12-18|2019-07-09|V.Y.F. Express Inc.|Manure screw press having screen vibration|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1350215A|SE537758C2|2013-02-22|2013-02-22|Screw conveyor for lignocellulose-containing material|SE1350215A| SE537758C2|2013-02-22|2013-02-22|Screw conveyor for lignocellulose-containing material|
    US14/766,877| US9434551B2|2013-02-22|2014-02-19|Screw conveyor for lignocellulose-containing material|
    PCT/SE2014/050199| WO2014129958A1|2013-02-22|2014-02-19|Screw conveyor for lignocellulose containing material|
    EP14754891.1A| EP2959055A4|2013-02-22|2014-02-19|Screw conveyor for lignocellulose containing material|
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