EP2254708A2 - Procédé de séparation par air d'un mélange de matière broyée et de fluide et broyeur séparateur associé - Google Patents

Procédé de séparation par air d'un mélange de matière broyée et de fluide et broyeur séparateur associé

Info

Publication number
EP2254708A2
EP2254708A2 EP09777119A EP09777119A EP2254708A2 EP 2254708 A2 EP2254708 A2 EP 2254708A2 EP 09777119 A EP09777119 A EP 09777119A EP 09777119 A EP09777119 A EP 09777119A EP 2254708 A2 EP2254708 A2 EP 2254708A2
Authority
EP
European Patent Office
Prior art keywords
displacement body
mill
separator part
net
dynamic separator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP09777119A
Other languages
German (de)
English (en)
Other versions
EP2254708B1 (fr
Inventor
André BÄTZ
Michael Keyssner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Loesche GmbH
Original Assignee
Loesche GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
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Application filed by Loesche GmbH filed Critical Loesche GmbH
Priority to PL09777119T priority Critical patent/PL2254708T3/pl
Publication of EP2254708A2 publication Critical patent/EP2254708A2/fr
Application granted granted Critical
Publication of EP2254708B1 publication Critical patent/EP2254708B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/12—Construction of the overflow ducting, e.g. diffusing or spiral exits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/10—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices using momentum effects
    • B07B13/11—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices using momentum effects involving travel of particles over surfaces which separate by centrifugal force or by relative friction between particles and such surfaces, e.g. helical sorters

Definitions

  • the invention relates to a method for the screening of a millbase-fluid mixture according to the preamble of claim 1 and a mill classifier for carrying out the method according to the preamble of claim 6.
  • the invention is particularly suitable for roller mill classifiers, which may be integrated in a roller mill or in a roller mill, for example, in an air flow mill or placed on this.
  • the classifiers typically include a dynamic classifier such as a ridge rotor, and stationary vanes which are annularly disposed about the dynamic indexer to form a viewing space.
  • the millbase-fluid mixture passes in an upwardly directed, spiral flow close to the housing into the classifying chamber, where the coarse material particles are separated and fall back into the grinding chamber via a semolina cone for renewed comminution.
  • the fine material entering the inguinal rotor is fed to the sifter upper part in a fine material fluid flow and to a fine material discharge via a fine material discharge and a pipeline (EP 1 239 966 B1, DE 1 923 661 B1, DE 36 17 3 746 A1, DE 34 03 940 C2).
  • US Pat. No. 4,597,537 discloses a sifter integrated in a vertical airflow mill, in which additional carrying or sighting gas is additionally supplied via fluid feedings arranged tangentially on the viewing space, as a result of which the visual effect is to be improved.
  • the arrangement of the device for influencing the flow within the classifier rotor and close to the blades of the classifier rotor can adversely affect the sighting in the viewing area and lead to a reduced quality of the sighting.
  • a subsequent installation of the device or a replacement is relatively expensive.
  • DE 199 47 862 A1 describes an air classifier with a classifying wheel rotating in a viewing chamber.
  • the classifying wheel is provided with a cover disk and the fine Good-air flow passes through an axial discharge opening in the cover plate of the classifying wheel in an expansion housing, which is designed as a spiral housing and provided with a lateral outlet channel.
  • an expansion housing which is designed as a spiral housing and provided with a lateral outlet channel.
  • fan blades extending into the expansion vessel are arranged, which are to supply additional kinetic energy in the expansion vessel to the fine-material air flow.
  • Airflow mixing systems have been continuously optimized in the past to reduce power consumption, with the main focus here being on reducing the differential pressure of the mill and reducing gas volumes.
  • the visual process has a great influence on the efficiency of a grinding plant.
  • the visual process influences the smoothness of the mill, the throughput of finished goods and the pressure loss of the entire system.
  • the differential pressure to overcome the flow resistances in the classifier and the power consumption at the rotor have a considerable share in the energy balance of the entire grinding plant.
  • the invention is based on the invention of providing a vision method and a mill sizer which increase the quality of the visual process and at the same time contribute to an improvement in the energy balance and a lower investment outlay of the entire grinding plant.
  • a basic idea of the invention can be seen in the fact that the fine material-fluid stream which emerges from the dynamic separator part due to the rotation of the rotor in a rotational movement or under a twist, to uniform and achieve a twist resolution or at least a significant reduction of the twist.
  • the expression of the twist is dependent on the peripheral speed of the rotor, which in turn depends on the particle size to be observed. Finer views require a higher peripheral speed than rougher views.
  • the fine material-fluid flow emerging with an angular momentum from the dynamic separator part is disadvantageous in various aspects.
  • the fine material or the dust of the two-phase flow is pressed due to the centrifugal force generated by the swirl on the wall of the reformeroberteils, where due to the friction flow losses and wear.
  • so-called "dust strands" form which with respect to the fine material-fluid flow leads to an uneven distribution of the fine-material particles in the sifter and also in the downstream dust separator.
  • overdimensioning of the dust collectors has in many cases been carried out.
  • the swirl of the two-phase flow emerging from the dynamic separator part is dissolved or at least considerably reduced and conveyed in the form of an approximately linear flow from the separator into the downstream separation unit.
  • the dissolution of the twist avoids disadvantageous storage of flow energy and achieves a considerable saving in differential pressure or energy consumption.
  • the equalization according to the invention of the fine material-fluid flow after exiting the dynamic separator part thus comprises a reduction or resolution of the angular momentum of the fine-fluid flow emerging from the rotor directly above the outlet cross-section of the dynamic separator part and the formation of a linear flow up to the outlet opening of the prepareers and down to the downstream units.
  • the homogenization of the fine material-fluid flow comprises a deflection from a spiraling flow into a nearly vertical flow with the aid of a diffuser, which is arranged in a classifier outlet housing above the outlet cross-section of the dynamic classifier.
  • a diffuser which is arranged in a classifier outlet housing above the outlet cross-section of the dynamic classifier.
  • it is also provided to expose the fine material-fluid flow in addition to the distributor to a displacement body.
  • This displacement body is expediently designed and arranged in such a way that the disadvantages of a pressure sink forming on account of the rotation of the dynamic separator part are largely avoided.
  • the pressure sink or potential vortex sink stores the flow energy in the form of angular momentum.
  • An inventive mill classifier which is provided with a Leitklappenkranz and a dynamic separator portion to form a reformraums and with a Groggutab arrangement and at least one discharge opening for a fine material-fluid flow, has a device for equalization and spin dissolution downstream of the dynamic separator part in a reformeraustrittsgephaseuse ,
  • the mill classifier according to the invention is a classifier integrated into or attached to an air flow roller mill with a strip rotor as the dynamic separator part and with a semolina cone for discharging the coarse material particles from the classifying chamber and returning them to the grinding chamber for further comminution.
  • a nozzle with guide elements is provided, which influences the fine material-fluid flow aerodynamically.
  • a displacement body in particular coaxial with the classifier or rotor axis, is also arranged.
  • the device for equalization and spin dissolution of the fine material-fluid flow emerging from the dynamic separator part is designed to be stationary and, in addition, the distributor device forms a unit with the displacement body.
  • the distributor is arranged according to the invention above an outlet cross-section of the dynamic separator in the bombarderaustrittsgephaseuse.
  • the displacement body expediently extends beyond the distributor and may, for example, have a height which is two to five times the height of the distributor.
  • the displacement body can expediently protrude with a lower, for example conical region in the dynamic separator part and prevent the formation of a pressure sink. If the dynamic sifter is a ridge rotor with an upwardly directed rotor cone, the lower conical portion of the pusher body can reach close to that rotor cone.
  • the displacement body is formed as a double cone, in which the upper conical or frusto-conical region has a lower conicity than the lower conical or frusto-conical region.
  • the displacement body can also be simplistic in axial section substantially cylindrical.
  • a displacement body co-rotating with the rotor can also be provided.
  • the diffuser can have the most varied design in order to capture the fine-material-fluid flow exiting with an angular momentum from the dynamic separator part and divert it into a substantially vertical linear flow.
  • the distributor can have flat or plate-shaped guide elements, which are arranged in a radial manner.
  • the guide elements may be formed as sheets and fastened to a guide tube, which is expediently arranged coaxially to the rotor axis.
  • a guide tube which is expediently arranged coaxially to the rotor axis.
  • Fluid mixture is formed curved in a lower, near-rotor region opposite to the twisting direction.
  • the guide elements can also be arcuate and / or shovelike or spherical in order to capture the fine material-fluid flow in a streamlined manner and to deflect it in a sliding or gentle manner in a vertical flow direction.
  • the guide elements can be attached with their rectifier surfaces on the outer circumference of the displacement body. This is expediently carried out in a lower region of the upper conical or frustoconical region of the displacement body, so that a larger region projects upwards beyond the guide elements and contributes to equalization and linear flow of the fine material / fluid mixture.
  • the apparatus it is expedient to provide a withdrawerauseriesgephaseuse which allows a further vertical upward flow of the uniform, linear fine material-fluid mixture between the displacement body and classifier housing.
  • the reformerauseriesgephaseuse be designed for integrated arrangement of the nozzle and advantageously the displacement body and have an overall height H, which is twice to four times greater in relation to the height H L of the nozzle.
  • the reformerauseriesgephaseuse is expediently cylindrical or conical and has in an upper and / or lateral area at least one outlet opening for the deflected, linear fine material-fluid flow.
  • An outlet connection for the fine-material-fluid stream flowing out in the direction of the dust separator can, in particular, be arranged laterally obliquely or horizontally.
  • the displacement body extends in a lateral arrangement of the outlet nozzle over the lower edge of the outlet nozzle.
  • the advantages of the method according to the invention and the mill classifier according to the invention consist in a virtually swirl-free, well-mixed fine material-fluid mixture or dust-air flow with a uniform dust distribution at the classifier outlet and thus also at the inlet cross-section of the subsequent dust collector.
  • the more even distribution of dust results in lower air consumption for the pneumatic transport of the dust or fine particles, with less wear on the walls of the classifier housing.
  • the twist resolution according to the invention reduces the pressure loss in the classifier and thus also the power consumption of the classifier drive.
  • the protestrungstrittsgephase may also have a simple construction. Essential are energy recovery or reduction and a much better efficiency in the downstream storage separation due to a more uniform distribution of the dust on individual filter chambers (modules) or a more even distribution on Abscheidezyklone. In addition to an improvement of the visual process and thus also the milling process thus a considerable increase in efficiency is achieved when operating a grinding plant.
  • the method according to the invention is preferably suitable for air flow roller mills with a built-in classifier, but not limited to these.
  • the device for spin dissolution or swirl reduction can basically be used in all classifiers with a dynamic rotating separator part. It is advantageous that the arrangement of the device according to the invention for swirl dissolution prefabricated with a diffuser and with a displacement body and also can be retrofitted in a classifier or placed on this.
  • FIG. 2 shows a mill classifier according to the invention with a distributor and a displacement body
  • Fig. 3 is a horizontal section along the line M-II in Fig. 1 and
  • Fig. 4 is a perspective view of a guide element of a nozzle of the mill classifier according to the invention.
  • Fig. 1 shows a mill classifier 2, which is integrated in a roller mill. From the roller mill, only an upper region of the mill housing 21 with a lateral Mahlgutzu operation 23 is shown. At the Mahlgutgeophuse 21, the classifier housing 22 connects.
  • the mill classifier 2 has a dynamic separator part 4, which in this exemplary embodiment is a strip rotor with rotor strips 5 arranged concentrically about a rotor axis 14. Coaxially to the dynamic separator part 4, a guide flap ring 6 is provided with guide flaps 7, which are arranged stationarily and optionally adjustable.
  • a grinding material-fluid mixture 3 rising from the grinding chamber passes in a rotational flow out of the grinding chamber into the classifying chamber 8, in which the coarse material particles 13 are separated off and fed via a semolina cone 9 as coarse material removal to the comminution.
  • Fig. 1 shows that the height H L of the device 10 in this embodiment is about one third of the total height H of the prepare for separation and spin dissolution of the fine material-fluid flow 11 emerging with an angular momentum from the dynamic separator 4 is designed as a fixed guide 15, which is provided with guide elements 16 arranged and formed in a defined manner.
  • the guide elements 16 are arranged for the rotating, rising fine material-fluid flow 11 substantially vertically and radially and attached to a guide tube 18 of the nozzle 15.
  • the guide tube 18 of the distributor 15 is circular-cylindrical and arranged coaxially with the rotor axis 14.
  • FIG. 3 illustrates that the guide elements 16 extend radially from the guide tube 18 and the nozzle 15 almost over the entire outlet cross section 27 of the dynamic sifter part 4 and the Almost equally large inlet cross-section of collecteraustrittsgephinuses 19 extends, the guide tube 18 may already act as a cover of the pressure sink formed in the dynamic separator 4 with a correspondingly larger diameter.
  • the radially or radially oriented guide elements 16 of the distributor 15 cause equalization and almost linear alignment of the fine material fluid flow 11 and a reduction in the angular momentum or resolution of the twist.
  • the schematic representation of a guide element 16 in Fig. 4 shows the substantially flat or plate-like shape and in a lower region, which is in the installed state near the dynamic separator part 4, a Anström Scheme 17, which in the direction of the incoming fine material-fluid flow 11, that is, opposite to the twisting direction, is curved to capture and redirect the fines-fluid flow 11 emerging from the dynamic separator 4.
  • a discharge opening 12 for the linear fine-material-fluid flow 11 is arranged in an upper and lateral region of the separator outlet housing 19 and directed obliquely upwards.
  • the fine material-fluid flow is with a much more uniform distribution of dust or fine particles over a Piping (not shown) a subsequent fine material deposition (not shown) supplied.
  • FIG. 2 shows a preferred embodiment of a classifier 2 according to the invention, in which the device 10 for equalization and swirl reduction or dissolution has, in addition to the distributor 15, a displacement body 20.
  • the displacement body 20 is arranged coaxially to the rotor axis 14 or mill axis and formed in a vertical section double-cone-shaped, wherein a lower conical or frusto-conical portion 25 extends into the dynamic separator part 4 and almost to a rotor cone 24.
  • An upper conical or frusto-conical region 26 is substantially higher than the lower conical region 25, but formed with a smaller conicity and has a height which is approximately two to five times the height of the diffuser.
  • the displacement body 20 is arranged and designed such that a pressure sink, which forms due to the rotation of the dynamic sifter part 4, which is a strip rotor in this embodiment, is not effective, so that it does not lead to a backflow of a fine material-fluid portion comes into the rotor center.
  • the guide elements 16 of the nozzle 15 are mounted in a lower region of the upper frusto-conical portion 26 of the displacement body 20, wherein the formation and arrangement of the guide elements 16 are provided with their rectifier surfaces as shown in Figures 3 and 4, radiating and with a curved Anström Society 17 can.
  • the diameter D 2 at the upper end of the displacement body 20 according to the embodiment of FIG. 2, in relation to the diameter D R of the nozzle 15, which coincides largely with the inner diameter of the prepare for handling the objects in the displacement body 20 according to the embodiment of FIG. 2, are in the range of about 0.35 to 0.6.
  • the displacement body may be approximately cylindrical in vertical section.
  • the displacement body can also be formed with the rotor around the axis of rotation 14 encircling.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Crushing And Grinding (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)

Abstract

Procédé de séparation par air d'un mélange de matière broyée et de fluide et broyeur séparateur permettant en particulier la mise en oeuvre dudit procédé. L'objet de la présente invention est d'améliorer le processus de broyage-séparation et de séparation ultérieure de la poussière et en particulier d'optimiser le bilan énergétique d'une installation de broyage. A cet effet, le flux de matière fine et de fluide sortant de la partie dynamique du séparateur à air avec une impulsion de rotation est non seulement soumis à une réduction, voire à une suppression de la rotation, mais aussi homogénéisé à l'aide d'un appareil de guidage et d'un corps de refoulement dans un carter de sortie du séparateur à air, et transformé en un flux presque linéaire. L'appareil de guidage fixe, situé coaxialement par rapport à l'axe de séparateur dans le carter de sortie de séparateur et le corps de refoulement peuvent être conçus comme une seule unité et les éléments de guidage de l'appareil de guidage peuvent être situés sur le corps de refoulement et atteindre pratiquement la paroi intérieure du carter de sortie de séparateur.
EP09777119A 2008-08-12 2009-07-10 Procédé de séparation par air d'un mélange de matière broyée et de fluide et broyeur séparateur associé Active EP2254708B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09777119T PL2254708T3 (pl) 2008-08-12 2009-07-10 Sposób odsiewania powietrznego mieszaniny materiału zmielonego i zawiesiny oraz odsiewacz powietrzny

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008038776.2A DE102008038776B4 (de) 2008-08-12 2008-08-12 Verfahren zur Sichtung eines Mahlgut-Fluid-Gemisches und Mühlensichter
PCT/EP2009/005039 WO2010017865A2 (fr) 2008-08-12 2009-07-10 Procédé de séparation par air d'un mélange de matière broyée et de fluide et broyeur séparateur associé

Publications (2)

Publication Number Publication Date
EP2254708A2 true EP2254708A2 (fr) 2010-12-01
EP2254708B1 EP2254708B1 (fr) 2011-09-28

Family

ID=41549900

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09777119A Active EP2254708B1 (fr) 2008-08-12 2009-07-10 Procédé de séparation par air d'un mélange de matière broyée et de fluide et broyeur séparateur associé

Country Status (21)

Country Link
US (2) US8453846B2 (fr)
EP (1) EP2254708B1 (fr)
JP (1) JP5200168B2 (fr)
KR (1) KR101289841B1 (fr)
CN (1) CN102123798B (fr)
AR (1) AR075746A1 (fr)
AT (1) ATE526093T1 (fr)
BR (1) BRPI0917672A8 (fr)
CA (1) CA2731691C (fr)
CL (1) CL2011000213A1 (fr)
DE (1) DE102008038776B4 (fr)
DK (1) DK2254708T3 (fr)
EA (1) EA020660B1 (fr)
ES (1) ES2370595T3 (fr)
MX (1) MX2011000954A (fr)
MY (1) MY159928A (fr)
PE (1) PE20110483A1 (fr)
PL (1) PL2254708T3 (fr)
UA (1) UA101045C2 (fr)
WO (1) WO2010017865A2 (fr)
ZA (1) ZA201100499B (fr)

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CN105944821A (zh) * 2016-06-30 2016-09-21 湖州丰盛新材料有限公司 一种辊磨机进风口的风速调节装置
CN106000615A (zh) * 2016-06-30 2016-10-12 湖州丰盛新材料有限公司 一种风速可调的热风循环选粉装置
DE102017116272A1 (de) 2017-07-19 2019-01-24 Netzsch Trockenmahltechnik Gmbh Verfahren und anlage zur herstellung eines ausgangsmaterials für die herstellung von seltenerdmagneten
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DE102018112406A1 (de) * 2018-05-24 2019-11-28 Netzsch Trockenmahltechnik Gmbh Verfahren und Anlage zur Herstellung eines Ausgangsmaterials für die Herstellung von Seltenerd-Magneten
CN109622252B (zh) * 2019-01-23 2024-03-12 桂林晟兴机械制造有限公司 外循环磨粉机高效选粉器
CN111617890A (zh) * 2020-04-29 2020-09-04 华电电力科学研究院有限公司 一种分离和回粉分开的粗粉分离器及其工作方法
CN112387597A (zh) * 2020-11-18 2021-02-23 江苏绿都环境工程有限公司 一种防磨损及物料堵塞的智能选粉机
CN113426530A (zh) * 2021-07-07 2021-09-24 郑州沃特节能科技股份有限公司 一种超细复合微粉制备装置及其方法
CN114260108B (zh) * 2021-12-27 2023-12-05 华北理工大学 一种多入口异形旋流器
CN114367442A (zh) * 2022-01-12 2022-04-19 安徽中体新材料科技有限公司 一种微纳米金属粉末的精细分级方法
CN115254626B (zh) * 2022-05-17 2024-01-30 朱贵 一种雾尘式选粉机

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CA2731691A1 (fr) 2010-02-18
KR20110060886A (ko) 2011-06-08
CN102123798B (zh) 2014-07-02
BRPI0917672A8 (pt) 2016-07-26
ES2370595T3 (es) 2011-12-20
US20110132813A1 (en) 2011-06-09
DE102008038776A1 (de) 2010-02-25
ATE526093T1 (de) 2011-10-15
CA2731691C (fr) 2015-01-27
ZA201100499B (en) 2011-10-26
MY159928A (en) 2017-02-15
JP2011530404A (ja) 2011-12-22
MX2011000954A (es) 2011-06-01
US9162256B2 (en) 2015-10-20
AU2009281486A1 (en) 2010-02-18
CL2011000213A1 (es) 2011-06-17
KR101289841B1 (ko) 2013-07-26
DK2254708T3 (da) 2012-01-16
US8453846B2 (en) 2013-06-04
WO2010017865A3 (fr) 2010-04-15
PL2254708T3 (pl) 2012-04-30
US20130284644A1 (en) 2013-10-31
BRPI0917672A2 (pt) 2015-12-01
UA101045C2 (ru) 2013-02-25
WO2010017865A2 (fr) 2010-02-18
EP2254708B1 (fr) 2011-09-28
DE102008038776B4 (de) 2016-07-07
AR075746A1 (es) 2011-04-27
EA201100186A1 (ru) 2011-06-30
PE20110483A1 (es) 2011-07-03
EA020660B1 (ru) 2014-12-30
CN102123798A (zh) 2011-07-13
JP5200168B2 (ja) 2013-05-15

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