EP0988895B1 - Vane wheel arrangement for air current roller mills - Google Patents
Vane wheel arrangement for air current roller mills Download PDFInfo
- Publication number
- EP0988895B1 EP0988895B1 EP99117649A EP99117649A EP0988895B1 EP 0988895 B1 EP0988895 B1 EP 0988895B1 EP 99117649 A EP99117649 A EP 99117649A EP 99117649 A EP99117649 A EP 99117649A EP 0988895 B1 EP0988895 B1 EP 0988895B1
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- EP
- European Patent Office
- Prior art keywords
- polygon
- blade ring
- segments
- ring according
- blade
- 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.)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
- B02C15/001—Air flow directing means positioned on the periphery of the horizontally rotating milling surface
Definitions
- the invention relates to a blade ring for airflow roller mills according to the preamble of claim 1.
- Blade ring is already known from US-A-5 054 697.
- Airflow roller mills, bowl mills or vertical airflow mills have arranged on a rotatable grinding bowl and grinding rollers rotatable about a fixed axis on. Between the grinding bowl and the mill housing an annular space is formed, in which essentially radially aligned guide vanes for guiding an ascending Carrier gas flow, e.g. an air flow with which the ground good is a sifter is fed.
- the annular space is designed as a circular ring and is with the guide vanes arranged therein as Blade ring, sometimes also called a nozzle ring.
- Known blade rings each consist of a rolled one cylindrical or conical outer ring and inner ring or from a combination of a conical exterior or Inner ring and a cylindrical inner or outer ring, between which the guide vanes are arranged.
- the Guide vanes form flow channels, which are usually have a rectangular cross section.
- shovel rings are also shovel rings known as a cast construction.
- the known blade rings are relatively expensive to manufacture connected. Especially with large roller mills, which shovel rings up to seven meters outside diameter can have, the production is extreme costly.
- the one-piece, ring-shaped blade rings are also in transport and assembly difficult to master and are therefore segmented Form or supplied as circular ring sectors on the construction sites and only assembled there. The segmentation sets however, an annealing treatment ahead so the ring construction is relaxed and separating cuts to produce the Segments no deformation, especially no cracking, trigger.
- the invention has for its object to provide a blade ring for airflow roller mills and comparable mills, which can be manufactured, transported and assembled particularly easily and inexpensively and is suitable for airflow roller mills of different sizes, in particular for very large airflow roller mills.
- a basic idea of the invention is a blade ring polygonal training and from a variety of Polygon segments a polygon blade ring in segment form manufacture.
- the polygon segments can be added to the site Polygon blade ring can be mounted or in groups in a prefabrication to be connected to polygons, which then to a closed polygon, i.e. to the polygon blade ring, can be assembled.
- At least the outer ring of the blade ring is which are also referred to as the outer jacket ring can be formed as a polygon and has a variety of outer polygon segments, which the top view Links between those on an imaginary circle represent lying points of the polygon or the chords.
- a polygon blade ring expediently consists of one Large number of outer polygon segments, which in one particularly advantageous production made from flat sheets can be.
- the flat polygon segments can vertical or with an angle of inclination on the mill housing can be attached directly or indirectly to together with the Guide vanes and an inner ring flow channels with a constant cross section or with a tapering upwards or to form a widening cross section.
- each outer polygon segment a guide vane arranged which is fixed, for example welded, or can be releasably attached. It is advantageous to use the polygon segments and guide vanes to be dimensioned such that two or more guide vanes can be arranged on a polygon segment. These guide vanes can be the same or different be trained.
- a major advantage of the polygonal design of the Vane ring is the option of the guide vanes to be able to employ almost any desired angle.
- the flat surfaces of an outer polygon segment and the associated one Inner polygon segments enable this arrangement, while in the blade rings of the prior art curved surfaces of the inner and outer ring the inclination limit the guide vanes.
- connection of the polygon segments can be detachable or permanent, for example, by welding. It is advantageous that by the number of polygon segments Deviation from the circular mill housing is relatively small can be held.
- Another advantage is that with a larger Number of polygon segments the total number of guide vanes of the polygon blade ring can be increased, because the flat surfaces of the outer and inner polygon segments allow their arrangement.
- a higher number of guide vanes enables an optimization of the fluid flow and improvement of the grinding and classifying process.
- guide vanes With several guide vanes in the area of a polygon segment there is the possibility of the guide vanes being different train and in terms of their shape, dimensioning and tendency to vary.
- the guide vanes can be flat or curved, for example, in the middle or fixed off-center and dimensioned differently his.
- the blade ring has only one polygonal outer ring, but none with this connected inner ring.
- the guide vanes are "flying" arranged and only attached to the outer polygon segments.
- An inner flow area i.e. an inner ring, is formed by an outer surface of the grinding bowl, which is generally cylindrical.
- the guide blades are expediently designed in such a way that that an inner edge largely parallel and with a slight Distance to the outer surface of the grinding bowl is.
- the advantages of the blade ring designed according to the invention are an extremely inexpensive production, a simplified transport and assembly, which without heavy equipment and carried out with a low risk of accident can be.
- the production of the flat polygon segments the outer and inner ring is less expensive, because the bending process is no longer required for sheet metal rolling and less waste due to the straight edges accrues.
- the production can be designed extremely efficiently because several layers of sheet metal are stacked on top of each other and with a common cut into the desired one Shape can be cut or burned. A prefabrication of the polygon segments with one or more guide vanes is possible.
- Figure 1 shows an example of a first variant of a segmented Polygonal blade ring 1 in a cutout perspective view.
- the polygonal blade ring 1 has an outer ring 2, an inner ring 3 and between these radially arranged guide vanes 4.
- the outer ring 2 and the inner ring 3 are segmented and form a polygon with a large number in plan view of corners 20 which are on an imaginary circular line lie and the individual sides of the upper edges 21 of Outer polygon segments 5 or from upper edges 22 of Inner polygon segments 6 are formed.
- the outer polygon segments 5 thus form tendons of an outer jacket ring, of the outer ring 2, while the inner polygon segments 6 Form tendons of an inner jacket ring, the inner ring 3.
- the dash-dotted lines show the sectors of the segmented Polygon blade ring 1, its polygon segments 10 in this example from an outer polygon segment 5, a complementary inner polygon segment 6 and a vane 4 exist.
- the guide vanes 4 are with an angle of attack ⁇ (see Fig. 2) arranged and form in pairs with the associated Areas of the inner ring 6 and the outer ring 5 each a flow channel 14.
- a guide vane 4 connects in each case an outer polygon segment 5 with the inner polygon segment 6 to the polygon segment 10, which with other polygon segments 10 connected to the segmented polygon blade ring 1 can be.
- outer polygon segments 5 and inner polygon segments 6 exist from flat sheets, with the outer polygon segments 5 with an inclination angle ⁇ on the mill housing 11 (see Fig. 2) are attached. At the top are cut out Sheets of existing outer polygon segments 5 via elements 12, which also serve as cover, on the mill housing 11 (see Fig. 2) attached.
- Figure 1 also shows a first variant of a polygon 15. This consists of three identically trained ones Outside polygon segments 5 and inside polygon segments 6 with guide vanes 4 arranged in between, i.e. out of three identically designed polygon segments 10.
- Figure 2 shows a second variant of a segmented polygon vane ring 1. This exists from a polygonal outer ring 2 with a Large number of outer polygon segments 5, which are made of planes Sheets exist and on an upper edge 21 over elements 12 and at a lower edge 23 with an angle of inclination ⁇ are attached to the mill housing 11.
- the perspective View of the polygonal blade ring 1 without one Inner ring and without showing the grinding bowl leaves the A clear view of an air duct 17 below the polygon blade ring 1.
- Fig. 2 illustrates that the flat surface the outer polygon segments 5 the arrangement of several Guide vanes 4 on a polygon segment 5 and with different Inclination angles ⁇ and in or against clockwise.
- FIG. 3 are the "flying" on the outer polygon segments 5 of the polygonal outer ring 2 fixed guide vanes 4 2 in a sectional sectional view shown.
- the same features are again with identical reference numerals of Figures 1 and 2 provided.
- the guide vanes 4 are designed such that an inner edge 9 parallel is arranged to an outer surface 7 of the grinding bowl 8.
- the outer surface 7 of the grinding bowl 8 takes over this Training the function of an inner ring 3 and is cylindrical educated.
- Fig. 3 shows above the outer polygon segments 5 or the polygonal outer ring 2 guide surfaces 13, which is an extension of the inclined outer segments 5 are arranged and a fluid flow from the Air duct 17 away from the mill housing 11 and in the direction Steer the mill center (not shown).
- Figure 4 shows the polygonal outer ring 2 in a detail and in plan view of the elements 12. This plan view should clarify that with a corresponding number of polygon segments 5 the deviation from the associated The arc is minimal, as shown in the illustration of the parallel mill housing 11 emerges.
- FIG. 5 shows an outer polygon segment 5 with one on it attached guide vane 4. number and positioning as well the size of the guide vanes 4 in relation to the polygon segment 5 are only exemplary and can be varied.
- the top view of the outer polygon segment 5 shows that this as well as the associated inner polygon segments 6 due to a polygonal inner ring (not shown) the straight edges are particularly easy to produce and especially cut from sheets stacked on top of each other can be.
- An upper, horizontal edge 21 and the vertical side edges 24 are straight and a lower one Edge 23 is curved and is in the installed state on the mill housing 11 (Fig. 3). It is possible, to integrate the element 12 in the polygon segment 5.
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Rolls And Other Rotary Bodies (AREA)
Description
Die Erfindung betrifft einen Schaufelkranz für Luftstrom-Wälzmühlen gemäß dem Oberbegriff des Anspruchs 1. Ein derartiger Schaufelkranz ist bereits aus US-A-5 054 697 bekannt.The invention relates to a blade ring for airflow roller mills according to the preamble of claim 1. Such Blade ring is already known from US-A-5 054 697.
Luftstrom-Wälzmühlen, Schüsselmühlen oder auch Vertikal-Luftstrommühlen weisen auf einer drehbaren Mahlschüssel angeordnete und um eine feststehende Achse drehbare Mahlwalzen auf. Zwischen der Mahlschüssel und dem Mühlengehäuse ist ein Ringraum ausgebildet, in welchem im wesentlichen radial ausgerichtete Leitschaufeln zur Führung einer aufsteigenden Trägergas-Strömung, z.B. einer Luftströmung, angeordnet sind, mit welcher das gemahlene Gut einem Sichter zugeführt wird. Der Ringraum ist als Kreisring ausgebildet und wird mit den darin angeordneten Leitschaufeln als Schaufelkranz, gelegentlich auch als Düsenring, bezeichnet.Airflow roller mills, bowl mills or vertical airflow mills have arranged on a rotatable grinding bowl and grinding rollers rotatable about a fixed axis on. Between the grinding bowl and the mill housing an annular space is formed, in which essentially radially aligned guide vanes for guiding an ascending Carrier gas flow, e.g. an air flow with which the ground good is a sifter is fed. The annular space is designed as a circular ring and is with the guide vanes arranged therein as Blade ring, sometimes also called a nozzle ring.
Bekannte Schaufelkränze bestehen jeweils aus einem gewalzten zylindrischen oder konischen Außenring und Innenring oder aus einer Kombination aus einem konischen Außen- oder Innenring und einem zylindrischen Innen- oder Außenring, zwischen denen die Leitschaufeln angeordnet sind. Die Leitschaufeln bilden Strömungskanäle, welche in der Regel einen rechteckigen Querschnitt aufweisen.Known blade rings each consist of a rolled one cylindrical or conical outer ring and inner ring or from a combination of a conical exterior or Inner ring and a cylindrical inner or outer ring, between which the guide vanes are arranged. The Guide vanes form flow channels, which are usually have a rectangular cross section.
Neben diesen aus gewalzten Ringen und eingeschweißten Leitschaufeln bestehenden Schaufelkränzen sind auch Schaufelkränze als Gußkonstruktion bekannt. In addition to these made from rolled rings and welded guide vanes Existing shovel rings are also shovel rings known as a cast construction.
Die bekannten Schaufelkränze sind mit relativ hohen Herstellungskosten verbunden. Insbesondere bei großen Wälzmühlen, welche Schaufelkränze bis zu sieben Meter Außendurchmesser aufweisen können, ist die Herstellung äußerst kostenaufwendig. Die einteiligen, ringförmigen Schaufelkränze sind außerdem im Transport und bei der Montage schwer zu beherrschen und werden deshalb in segmentierter Form oder als Kreisringsektoren auf die Baustellen geliefert und erst dort zusammengebaut. Das Segmentieren setzt jedoch eine Glühbehandlung voraus, damit die Ringkonstruktion entspannt wird und Trennschnitte zur Herstellung der Segmente keine Verformung, insbesondere kein Aufspringen, auslösen.The known blade rings are relatively expensive to manufacture connected. Especially with large roller mills, which shovel rings up to seven meters outside diameter can have, the production is extreme costly. The one-piece, ring-shaped blade rings are also in transport and assembly difficult to master and are therefore segmented Form or supplied as circular ring sectors on the construction sites and only assembled there. The segmentation sets however, an annealing treatment ahead so the ring construction is relaxed and separating cuts to produce the Segments no deformation, especially no cracking, trigger.
Der Erfindung liegt die Aufgabe zugrunde, einen Schaufelkranz für Luftstrom-Wälzmühlen und vergleichbare Mühlen zu schaffen, welcher besonders einfach und kostengünstig hergestellt, transportiert und montiert werden kann und für Luftstrom-Wälzmühlen unterschiedlicher Größenordnungen, insbesondere für sehr große Luftstrom-Wälzmühlen geeignet ist.The invention has for its object to provide a blade ring for airflow roller mills and comparable mills, which can be manufactured, transported and assembled particularly easily and inexpensively and is suitable for airflow roller mills of different sizes, in particular for very large airflow roller mills.
Erfindungsgemäß wird die Aufgabe durch die Merkmale des Anspruchs 1 gelöst. Zweckmäßige und vorteilhafte Ausgestaltungen sind in den Unteransprüchen und in der Figurenbeschreibung enthalten.According to the invention the object is achieved by the features of the claim 1 solved. Practical and advantageous configurations are in the dependent claims and in the description of the figures contain.
Ein Grundgedanke der Erfindung besteht darin, einen Schaufelkranz polygonal auszubilden und aus einer Vielzahl von Polygonsegmenten einen Polygon-Schaufelkranz in Segmentform herzustellen. Die Polygonsegmente können vor Ort zu dem Polygon-Schaufelkranz montiert werden oder gruppenweise in einer Vorfertigung zu Polygonzügen verbunden werden, welche dann zu einem geschlossenen Polygon, d.h. zu dem Vieleck-Schaufelkranz, montiert werden können. A basic idea of the invention is a blade ring polygonal training and from a variety of Polygon segments a polygon blade ring in segment form manufacture. The polygon segments can be added to the site Polygon blade ring can be mounted or in groups in a prefabrication to be connected to polygons, which then to a closed polygon, i.e. to the polygon blade ring, can be assembled.
Erfindungsgemäß ist wenigstens der Außenring des Schaufelkranzes, der auch als äußerer Mantelring bezeichnet werden kann, als ein Polygon ausgebildet und weist eine Vielzahl von Außen-Polygonsegmenten auf, welche in Draufsicht die Verbindungsstrecken zwischen den auf einem gedachten Kreis liegenden Punkten des Polygons bzw. die Sehnen darstellen.According to the invention, at least the outer ring of the blade ring is which are also referred to as the outer jacket ring can be formed as a polygon and has a variety of outer polygon segments, which the top view Links between those on an imaginary circle represent lying points of the polygon or the chords.
Zweckmäßigerweise besteht ein Vieleck-Schaufelkranz aus einer Vielzahl von Außen-Polygonsegmenten, welche in einer besonders vorteilhaften Fertigung aus ebenen Blechen hergestellt werden können. Die ebenen Polygonsegmente können senkrecht oder mit einem Neigungswinkel am Mühlengehäuse direkt oder indirekt befestigt werden, um zusammen mit den Leitschaufeln und einem Innenring Strömungskanäle mit einem konstanten Querschnitt oder mit einem sich nach oben verjüngenden oder auch erweiternden Querschnitt zu bilden.A polygon blade ring expediently consists of one Large number of outer polygon segments, which in one particularly advantageous production made from flat sheets can be. The flat polygon segments can vertical or with an angle of inclination on the mill housing can be attached directly or indirectly to together with the Guide vanes and an inner ring flow channels with a constant cross section or with a tapering upwards or to form a widening cross section.
Zweckmäßigerweise ist an jedem Außen-Polygonsegment wenigstens eine Leitschaufel angeordnet, welche fest, beispielsweise angeschweißt, oder auch lösbar befestigt sein kann. Es ist vorteilhaft, die Polygonsegmente und Leitschaufeln derart zu dimensionieren, daß zwei oder auch mehrere Leitschaufeln an einem Polygonsegment angeordnet werden können. Diese Leitschaufeln können gleich oder auch unterschiedlich ausgebildet sein.It is expedient at least on each outer polygon segment a guide vane arranged which is fixed, for example welded, or can be releasably attached. It is advantageous to use the polygon segments and guide vanes to be dimensioned such that two or more guide vanes can be arranged on a polygon segment. These guide vanes can be the same or different be trained.
Des weiteren können die mit einer vorgebbaren Neigung befestigten Leitschaufeln der Polygonsegmente in der mit der Drehrichtung der Mahlschüssel übereinstimmenden oder in der entgegengesetzten Richtung angeordnet sein.Furthermore, they can be attached with a predeterminable inclination Guide vanes of the polygon segments in the with the Direction of rotation of the grinding bowl matching or in the opposite direction.
Bei einem Innenring, welcher komplementär zum Außenring als ein Polygon ausgebildet ist und Innen-Polygonsegmente mit ebenen, senkrecht oder auch geneigt angeordneten Flächen aufweist, ist es vorteilhaft, daß wenigstens eine Leitschaufel das Innensegment mit dem Außensegment verbinden kann. Das so gebildete Polygonsegment wird dann mit weiteren Polygonsegmenten zu einem polygonalen Schaufelkranz verbunden.In the case of an inner ring which is complementary to the outer ring a polygon is formed and with inner polygon segments flat, vertical or inclined surfaces has, it is advantageous that at least one guide vane connect the inner segment to the outer segment can. The polygon segment formed in this way is then combined with others Polygon segments to form a polygonal blade ring connected.
Ein wesentlicher Vorteil der polygonalen Ausbildung des Schaufelkranzes ist die Möglichkeit, die Leitschaufeln nahezu in jedem gewünschten Winkel anstellen zu können. Die ebenen Flächen eines Außen-Polygonsegmentes und des zugehörigen Innen-Polygonsegmentes ermöglichen diese Anordnung, während bei den Schaufelkränzen des Standes der Technik die gebogenen Flächen des Innen- und Außenringes die Neigung der Leitschaufeln begrenzen.A major advantage of the polygonal design of the Vane ring is the option of the guide vanes to be able to employ almost any desired angle. The flat surfaces of an outer polygon segment and the associated one Inner polygon segments enable this arrangement, while in the blade rings of the prior art curved surfaces of the inner and outer ring the inclination limit the guide vanes.
Die Verbindung der Polygonsegmente kann lösbar oder dauerhaft, beispielsweise durch Verschweißung, erfolgen. Es ist vorteilhaft, daß durch die Anzahl der Polygonsegmente die Abweichung vom kreisringförmigen Mühlengehäuse relativ gering gehalten werden kann.The connection of the polygon segments can be detachable or permanent, for example, by welding. It is advantageous that by the number of polygon segments Deviation from the circular mill housing is relatively small can be held.
Ein weiterer Vorteil besteht darin, daß mit einer größeren Anzahl von Polygonsegmenten die Gesamtanzahl der Leitschaufeln des Polygon-Schaufelkranzes erhöht werden kann, weil die ebenen Flächen der Außen- und Innen-Polygonsegmente deren Anordnung zulassen. Eine höhere Anzahl an Leitschaufeln ermöglicht eine Optimierung der Fluidströmung und Verbesserung des Mahl- und Sichtprozesses.Another advantage is that with a larger Number of polygon segments the total number of guide vanes of the polygon blade ring can be increased, because the flat surfaces of the outer and inner polygon segments allow their arrangement. A higher number of guide vanes enables an optimization of the fluid flow and improvement of the grinding and classifying process.
Bei mehreren Leitschaufeln im Bereich eines Polygonsegmentes besteht die Möglichkeit, die Leitschaufeln unterschiedlich auszubilden und hinsichtlich ihrer Formgebung, Dimensionierung und Neigung zu variieren. Die Leitschaufeln können beispielsweise eben oder gekrümmt ausgebildet, mittig oder außermittig fixiert und unterschiedlich dimensioniert sein. With several guide vanes in the area of a polygon segment there is the possibility of the guide vanes being different train and in terms of their shape, dimensioning and tendency to vary. The guide vanes can be flat or curved, for example, in the middle or fixed off-center and dimensioned differently his.
In einer bevorzugten Ausgestaltung weist der Schaufelkranz nur einen polygonalen Außenring, jedoch keinen mit diesem verbundenen Innenring auf. Die Leitschaufeln sind "fliegend" angeordnet und nur an den Außen-Polygonsegmenten befestigt. Eine innere Strömungsfläche, d.h. ein Innenring, wird von einer Außenfläche der Mahlschüssel gebildet, welche in der Regel zylindrisch ausgebildet ist.In a preferred embodiment, the blade ring has only one polygonal outer ring, but none with this connected inner ring. The guide vanes are "flying" arranged and only attached to the outer polygon segments. An inner flow area, i.e. an inner ring, is formed by an outer surface of the grinding bowl, which is generally cylindrical.
Sinnvollerweise sind die Leitschaufeln derart ausgebildet, daß eine Innenkante weitgehend parallel und mit einem geringen Abstand zu der Außenfläche der Mahlschüssel angeordnet ist.The guide blades are expediently designed in such a way that that an inner edge largely parallel and with a slight Distance to the outer surface of the grinding bowl is.
Die Vorteile des erfindungsgemäß ausgebildeten Schaufelkranzes sind eine außerordentlich kostengünstige Fertigung, ein vereinfachter Transport und eine Montage, welche ohne schweres Gerät und mit einem geringen Unfallrisiko durchgeführt werden kann. Die Herstellung der ebenen Polygonsegmente des Außen- und Innenrings ist kostengünstiger, weil der Biegevorgang für das Blechwalzen nicht mehr erforderlich ist und weniger Verschnitt wegen der geraden Kanten anfällt. Die Fertigung kann äußerst rationell gestaltet werden, weil mehrere Blechschichten übereinander gestapelt und mit einem gemeinsamen Trennschnitt in die gewünschte Form geschnitten oder gebrannt werden können. Eine Vorfertigung der Polygonsegmente mit einer oder mehreren Leitschaufeln ist möglich.The advantages of the blade ring designed according to the invention are an extremely inexpensive production, a simplified transport and assembly, which without heavy equipment and carried out with a low risk of accident can be. The production of the flat polygon segments the outer and inner ring is less expensive, because the bending process is no longer required for sheet metal rolling and less waste due to the straight edges accrues. The production can be designed extremely efficiently because several layers of sheet metal are stacked on top of each other and with a common cut into the desired one Shape can be cut or burned. A prefabrication of the polygon segments with one or more guide vanes is possible.
Weitere Vorteile ergeben sich für den Mahl- und Sichtprozeß aufgrund der möglichen Variation von Anzahl, Anordnung, Ausbildung und Neigung der Leitschaufeln an einem Polygonsegment.There are further advantages for the grinding and classifying process due to the possible variation in number, arrangement, Formation and inclination of the guide vanes on a polygon segment.
Die Erfindung wird nachstehend anhand einer Zeichnung weiter erläutert; in dieser zeigen in stark schematisierter Weise
- Fig. 1
- einen Ausschnitt einer ersten Ausbildungsvariante eines erfindungsgemäßen segmentierten Polygon-Schaufelkranzes in perspektivischer Darstellung;
- Fig. 2
- einen Ausschnitt einer zweiten Ausbildungsvariante eines erfindungsgemäßen segmentierten Polygon-Schaufelkranzes in perspektivischer Darstellung;
- Fig. 3
- einen Längsschnitt durch eine Luftstrom-Wälzmühle im Bereich eines erfindungsgemäßen segmentierten Polygon-Schaufelkranzes der zweiten Ausbildungsvariante;
- Fig. 4
- eine Draufsicht auf den Polygon-Schaufelkranz im Bereich des Außenrings nach Pfeil IV der Fig. 3 und
- Fig. 5
- eine Draufsicht auf ein Außen-Polygonsegment mit Leitschaufel nach Pfeil V gemäß Fig. 3.
- Fig. 1
- a detail of a first embodiment of a segmented polygon blade ring according to the invention in a perspective view;
- Fig. 2
- a detail of a second embodiment of a segmented polygon blade ring according to the invention in a perspective view;
- Fig. 3
- a longitudinal section through an airflow roller mill in the region of a segmented polygon blade ring according to the invention of the second embodiment;
- Fig. 4
- a plan view of the polygon blade ring in the region of the outer ring according to arrow IV of FIGS. 3 and
- Fig. 5
- 3 shows a plan view of an outer polygon segment with a guide vane according to arrow V according to FIG. 3.
Figur 1 zeigt beispielhaft eine erste Variante eines segmentierten
Vieleck-Schaufelkranzes 1 in einer ausschnittsweisen
perspektivischen Darstellung. Der polygonale Schaufelkranz
1 weist einen Außenring 2, einen Innenring 3 und
zwischen diesen radial angeordnete Leitschaufeln 4 auf.Figure 1 shows an example of a first variant of a segmented
Polygonal blade ring 1 in a cutout
perspective view. The polygonal blade ring
1 has an
Der Außenring 2 und der Innenring 3 sind segmentiert ausgebildet
und bilden in Draufsicht ein Polygon mit einer Vielzahl
von Ecken 20, welche auf einer gedachten Kreislinie
liegen und deren einzelne Seiten von oberen Kanten 21 von
Außen-Polygonsegmenten 5 bzw. von oberen Kanten 22 von
Innen-Polygonsegmenten 6 gebildet werden. Die Außen-Polygonsegmente
5 bilden somit Sehnen eines äußeren Mantelringes,
des Außenrings 2, während die Innen-Polygonsegmente 6
Sehnen eines inneren Mantelrings, des Innenrings 3, bilden. The
Die strichpunktierten Linien zeigen die Sektoren des segmentierten
Polygon-Schaufelkranzes 1, dessen Polygonsegmente
10 in diesem Beispiel aus einem Außen-Polygonsegment 5,
einem komplementär ausgebildeten Innen-Polygonsegment 6 und
einer Leitschaufel 4 bestehen.The dash-dotted lines show the sectors of the segmented
Polygon blade ring 1, its
Die Leitschaufeln 4 sind mit einem Anstellwinkel α (siehe
Fig. 2) angeordnet und bilden paarweise mit den zugehörigen
Bereichen des Innenrings 6 und des Außenrings 5 jeweils
einen Strömungskanal 14.The guide vanes 4 are with an angle of attack α (see
Fig. 2) arranged and form in pairs with the associated
Areas of the
In diesem Beispiel verbindet jeweils eine Leitschaufel 4
ein Außen-Polygonsegment 5 mit dem Innen-Polygonsegment 6
zu dem Polygonsegment 10, welches mit weiteren Polygonsegmenten
10 zu dem segmentierten Polygon-Schaufelkranz 1 verbunden
werden kann.In this example, a guide vane 4 connects in each case
an
Die Außen-Polygonsegmente 5 und Innen-Polygonsegmente 6 bestehen
aus ebenen Blechen, wobei die Außen-Polygonsegmente
5 mit einem Neigungswinkel β am Mühlengehäuse 11 (siehe
Fig. 2) befestigt sind. Am oberen Ende sind die aus zugeschnittenen
Blechen bestehenden Außen-Polygonsegmente 5
über Elemente 12, welche auch zur Abdeckung dienen, am Mühlengehäuse
11 (siehe Fig. 2) befestigt.The
Figur 1 zeigt außerdem eine erste Variante eines Polygonzugs
15. Dieser besteht hier aus drei identisch ausgebildeten
Außen-Polygonsegmenten 5 sowie Innen-Polygonsegmenten 6
mit dazwischen angeordneten Leitschaufeln 4, d.h. aus drei
identisch ausgebildeten Polygonsegmenten 10.Figure 1 also shows a first variant of a
Figur 2 zeigt in einem Ausschnitt eine zweite Variante eines
segmentierten Vieleck-Schaufelkranzes 1. Dieser besteht
aus einem polygonal ausgebildeten Außenring 2 mit einer
Vielzahl von Außen-Polygonsegmenten 5, welche aus ebenen
Blechen bestehen und an einer oberen Kante 21 über Elemente
12 und an einer unteren Kante 23 mit einem Neigungswinkel
β am Mühlengehäuse 11 befestigt sind. Der perspektivische
Blick auf den polygonalen Schaufelkranz 1 ohne einen
Innenring und ohne Darstellung der Mahlschüssel läßt den
Blick frei auf einen Luftkanal 17 unterhalb des Vieleck-Schaufelkranzes
1. Fig. 2 verdeutlicht, daß die ebene Fläche
der Außen-Polygonsegmente 5 die Anordnung mehrerer
Leitschaufeln 4 an einem Polygonsegment 5 und mit unterschiedlichen
Neigungswinkeln α sowie im oder entgegen
dem Uhrzeigersinn zuläßt.Figure 2 shows a second variant of a
segmented polygon vane ring 1. This exists
from a polygonal
In Fig. 3 sind die "fliegend" an den Außen-Polygonsegmenten
5 des polygonalen Außenrings 2 befestigten Leitschaufeln 4
gemäß Fig. 2 in einer ausschnittsweisen Schnittdarstellung
gezeigt. Gleiche Merkmale sind wiederum mit identischen Bezugszeichen
der Figuren 1 und 2 versehen. Die Leitschaufeln
4 sind derart ausgebildet, daß eine Innenkante 9 parallel
zu einer Außenfläche 7 der Mahlschüssel 8 angeordnet ist.
Die Außenfläche 7 der Mahlschüssel 8 übernimmt bei dieser
Ausbildung die Funktion eines Innenrings 3 und ist zylindrisch
ausgebildet. Fig. 3 zeigt oberhalb der Außen-Polygonsegmente
5 bzw. des polygonalen Außenrings 2 Leitflächen
13, welche in Verlängerung der geneigt angeordneten Außensegmente
5 angeordnet sind und einen Fluidstrom aus dem
Luftkanal 17 von dem Mühlengehäuse 11 weg und in Richtung
Mühlenzentrum (nicht dargestellt) lenken.3 are the "flying" on the
Figur 4 zeigt den polygonalen Außenring 2 in einem Ausschnitt
und in Draufsicht auf die Elemente 12. Diese Draufsicht
soll verdeutlichen, daß bei einer entsprechenden Anzahl
von Polygonsegmenten 5 die Abweichung von dem zugehörigen
Kreisbogen minimal ausfällt, wie aus der Darstellung
des parallelen Mühlengehäuses 11 hervorgeht. Figure 4 shows the polygonal
Figur 5 zeigt ein Außen-Polygonsegment 5 mit einer daran
befestigten Leitschaufel 4. Anzahl und Positionierung sowie
die Größe der Leitschaufeln 4 in Relation zum Polygonsegment
5 sind lediglich beispielhaft und können variiert werden.
Die Draufsicht auf das Außen-Polygonsegment 5 zeigt,
daß dieses ebenso wie die zugehörigen Innen-Polygonsegmente
6 eines polygonalen Innenringes (nicht dargestellt) aufgrund
der geraden Kanten besonders einfach hergestellt und
insbesondere aus übereinander gestapelten Blechen zugeschnitten
werden können. Eine obere, horizontale Kante 21
und die vertikalen Seitenkanten 24 sind gerade und eine untere
Kante 23 ist gebogen ausgebildet und liegt in Einbauzustand
am Mühlengehäuse 11 (Fig. 3) an. Es ist möglich,
das Element 12 in dem Polygonsegment 5 zu integrieren.FIG. 5 shows an
Claims (16)
- Blade ring for air-swept roller mills comprising an outer ring (2) and an inner ring (3) between which are positioned guide blades (4) accompanied by the formation of flow ducts (14),
characterized in that
the blade ring is constructed as a polygonal blade ring (1) and at least the outer ring (2) is polygonally constructed. - Blade ring according to claim 1,
characterized in that
the outer ring (2) is constructed as a segmented polygonal blade ring and consists of a plurality of planar metal sheets as outer polygon segments (5). - Blade ring according to claim 1 or 2,
characterized in that
in each case one or more guide blades (4) are placed on the outer polygon segments (5). - Blade ring according to one of the preceding claims,
characterized in that
the outer polygon segments (5) are arranged in vertical or inclined manner and connected to the polygonal outer ring (2). - Blade ring according to one of the preceding claims,
characterized in that
several outer polygon segments (5) are connected to a polygon run (15) and several polygon runs (15) to the segmented polygonal blade ring (1). - Blade ring according to claim 5,
characterized in that
the polygon runs (15) have the same or a different number of polygon segments (5). - Blade ring acording to claim 5 or 6,
characterized in that
the polygon segments (5) are connected detachably to the polygon runs (15) and/or the polygon runs (15) are detachably interconnected to the polygon blade ring (1). - Blade ring according to one of the preceding claims,
characterized in that
the inner ring (3) has a polygonal construction and has inner polygon segments (6), which are positioned facing the outer polygon segments (5). - Blade ring according to claim 8,
characterized in that
the inner polygon segments (6) and outer polygon segments (5) are in each case interconnected by at least one guide blade (4) to a polygon segment (10) and several polygon segments (10) are connected to the polygon run (15). - Blade ring according to claim 9,
characterized in that
the guide blades (4) are welded to the polygon segments (5, 6). - Blade ring according to one of the claims 1 to 8,
characterized in that
the inner ring (3) is formed by an outer surface (7) of the grinding bowl (8). - Blade ring according to claim 11,
characterized in that
the guide blades (4) are fixed to the outer polygon segments (5) and have an inner edge (9), which is arranged parallel to and with a limited spacing from the outer surface (7) of the grinding bowl (8). - Blade ring according to one of the preceding claims,
characterized in that
the guide blades (4) are arranged in inclined manner with a predetermined setting angle α and in or counter to the grinding bowl (8) rotation direction. - Blade ring according to one of the preceding claims,
characterized in that
the guide blades (4) are detachably fixed. - Blade ring according to one of the preceding claims,
characterized in that
the guide blades (4) are constructed planar or curved. - Blade ring according to one of the claims 8 to 15,
characterized in that
the guide blades (4) are fixed centrally or eccentrically to the polygon segments (5, 6).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19844112A DE19844112A1 (en) | 1998-09-25 | 1998-09-25 | Bucket ring for airflow roller mills |
| DE19844112 | 1998-09-25 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0988895A2 EP0988895A2 (en) | 2000-03-29 |
| EP0988895A3 EP0988895A3 (en) | 2000-05-31 |
| EP0988895B1 true EP0988895B1 (en) | 2002-05-29 |
Family
ID=7882289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99117649A Expired - Lifetime EP0988895B1 (en) | 1998-09-25 | 1999-09-07 | Vane wheel arrangement for air current roller mills |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US6079646A (en) |
| EP (1) | EP0988895B1 (en) |
| JP (1) | JP3403129B2 (en) |
| CA (1) | CA2283371C (en) |
| CZ (1) | CZ291326B6 (en) |
| DE (2) | DE19844112A1 (en) |
| DK (1) | DK0988895T3 (en) |
| ES (1) | ES2177182T3 (en) |
| ZA (1) | ZA996064B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6820829B1 (en) * | 2000-02-25 | 2004-11-23 | Exportech Company, Inc. | Method and apparatus for separating material |
| US8317119B2 (en) * | 2009-11-19 | 2012-11-27 | Wark Rickey E | Double course vane wheel |
| US20110114769A1 (en) * | 2009-11-19 | 2011-05-19 | Wark Rickey E | Double course vane wheel |
| WO2011120568A1 (en) * | 2010-03-31 | 2011-10-06 | Magotteaux International S.A. | Ring for grinding mill |
| US8336796B2 (en) * | 2010-09-10 | 2012-12-25 | Wark Rickey E | Impactor ring for updraft classifiers |
| CN102764687B (en) * | 2011-05-03 | 2015-01-28 | 华东电力试验研究院有限公司 | Medium speed mill primary separation dynamic regulating system and its regulating method |
| JP5791556B2 (en) * | 2012-03-26 | 2015-10-07 | 三菱日立パワーシステムズ株式会社 | Vertical crusher |
| CN103203264B (en) * | 2013-02-07 | 2015-07-01 | 洛阳矿山机械工程设计研究院有限责任公司 | Airflow transportation method for vertical roller mill airflow device of cement raw material slag |
| CN105032558A (en) * | 2015-06-05 | 2015-11-11 | 桂林天祥机械制造有限公司 | Raymond mill scraper knife and manufacturing method thereof |
| CN106423415B (en) * | 2016-07-22 | 2018-06-26 | 天津水泥工业设计研究院有限公司 | A kind of vane structure of vertical roll grinder |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2309900A1 (en) * | 1973-02-28 | 1974-08-29 | Loesche Kg | ARMOR RING FOR DEFLECTING A FLOW OF DUST GAS FOR EXAMPLE AT MUHLEN |
| US4523721A (en) * | 1982-12-08 | 1985-06-18 | Combustion Engineering, Inc. | Bowl mill with primary classifier assembly |
| DE3418196A1 (en) * | 1984-05-16 | 1985-11-21 | Krupp Polysius Ag, 4720 Beckum | RINGMILL WITH ADJUSTABLE NOZZLE RING |
| DE3423412A1 (en) * | 1984-06-25 | 1986-01-02 | Claudius Peters Ag, 2000 Hamburg | VERTICAL MILL, ESPECIALLY GRINDING MILL FOR COAL GRINDING |
| US4721258A (en) * | 1985-12-12 | 1988-01-26 | The Babcock & Wilcox Company | Roll-and-race pulverizer with rotating throat |
| US5054697A (en) * | 1990-01-02 | 1991-10-08 | Provost Robert S | Removable mill throat and wear ring for pulverizer |
| US5263855A (en) * | 1992-05-14 | 1993-11-23 | The Babcock & Wilcox Company | Low pressure drop rotating vertical vane inlet passage for coal pulverizer |
| US5340041A (en) * | 1992-11-25 | 1994-08-23 | The Babcock & Wilcox Company | Welded rotating annular passage segment for coal pulverizers with replaceable vanes and adjustable passage port area |
| US5605292A (en) * | 1995-09-06 | 1997-02-25 | March-Southwestern Corp. | Pulverizer mill high performance classifier system |
| US5819947A (en) * | 1996-01-29 | 1998-10-13 | Sure Alloy Steel Corporation | Classifier cage for rotating mill pulverizers |
-
1998
- 1998-09-25 DE DE19844112A patent/DE19844112A1/en not_active Withdrawn
-
1999
- 1999-01-25 US US09/236,086 patent/US6079646A/en not_active Expired - Lifetime
- 1999-09-07 EP EP99117649A patent/EP0988895B1/en not_active Expired - Lifetime
- 1999-09-07 DE DE59901534T patent/DE59901534D1/en not_active Expired - Lifetime
- 1999-09-07 DK DK99117649T patent/DK0988895T3/en active
- 1999-09-07 ES ES99117649T patent/ES2177182T3/en not_active Expired - Lifetime
- 1999-09-22 ZA ZA9906064A patent/ZA996064B/en unknown
- 1999-09-24 CA CA002283371A patent/CA2283371C/en not_active Expired - Fee Related
- 1999-09-24 CZ CZ19993426A patent/CZ291326B6/en not_active IP Right Cessation
- 1999-09-27 JP JP27304399A patent/JP3403129B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE59901534D1 (en) | 2002-07-04 |
| JP3403129B2 (en) | 2003-05-06 |
| CZ342699A3 (en) | 2000-04-12 |
| US6079646A (en) | 2000-06-27 |
| JP2000093821A (en) | 2000-04-04 |
| DE19844112A1 (en) | 2000-03-30 |
| CZ291326B6 (en) | 2003-02-12 |
| ES2177182T3 (en) | 2002-12-01 |
| CA2283371C (en) | 2004-12-07 |
| DK0988895T3 (en) | 2002-09-09 |
| CA2283371A1 (en) | 2000-03-25 |
| EP0988895A3 (en) | 2000-05-31 |
| EP0988895A2 (en) | 2000-03-29 |
| ZA996064B (en) | 2000-01-12 |
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