EP0405518B1 - Surfaces de broyage pour broyeurs à rouleaux - Google Patents

Surfaces de broyage pour broyeurs à rouleaux Download PDF

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Publication number
EP0405518B1
EP0405518B1 EP90112285A EP90112285A EP0405518B1 EP 0405518 B1 EP0405518 B1 EP 0405518B1 EP 90112285 A EP90112285 A EP 90112285A EP 90112285 A EP90112285 A EP 90112285A EP 0405518 B1 EP0405518 B1 EP 0405518B1
Authority
EP
European Patent Office
Prior art keywords
grinding
segments
roller
grinding surface
ceramic
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.)
Expired - Lifetime
Application number
EP90112285A
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German (de)
English (en)
Other versions
EP0405518A3 (en
EP0405518A2 (fr
Inventor
Horst Dipl.-Ing. Brundiek
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
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Application filed by Loesche GmbH filed Critical Loesche GmbH
Priority to DE9007658U priority Critical patent/DE9007658U1/de
Publication of EP0405518A2 publication Critical patent/EP0405518A2/fr
Publication of EP0405518A3 publication Critical patent/EP0405518A3/de
Application granted granted Critical
Publication of EP0405518B1 publication Critical patent/EP0405518B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B02C15/004—Shape or construction of rollers or balls
    • B02C15/005—Rollers or balls of composite construction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/30—Shape or construction of rollers
    • B02C4/305—Wear resistant rollers
    • 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
    • B02C15/003—Shape or construction of discs or rings
    • 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
    • B02C2015/002—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs combined with a classifier

Definitions

  • the invention relates to a grinding surface of grinding rollers and / or a grinding track in roller mills or roller mills according to the preamble of claim 1, see GB-A-996 768.
  • the aforementioned term of the grinding surface of roller or roller mills is understood below to mean specifically the mutually facing surfaces of the grinding roller or rollers and the grinding path of the rotating grinding bowl of a roller or roller mill, with the corresponding grinding gap between these facing grinding surfaces for comminuting materials such as Cement raw material, cement clinker, coal or the like is provided.
  • a grinding surface of the generic type is known from DE 26 43 307 A1.
  • the grinding surface relates to a grinding roller, which, viewed over its circumference, has armor elements made of a more wear-resistant material than the roller shell. These armor elements are positively inserted in dovetail-like grooves in the roller jacket and secured with flange rings on the axial faces. Therefore, wear-resistant armor elements alternate with the softer material of the roller shell on this grinding surface. These material differences ultimately lead to such an interpretation A stronger wear occurs locally on the harder metal materials or the softer material is more abraded on the grinding surface, so that even loosening and possibly complete falling out of the form-fitting armor elements can occur.
  • ceramic components While ceramic components have practically no thermal expansion, the metallic assemblies, such as the base body or roll shell of a grinding roller, have a relatively high coefficient of thermal expansion, so that joining problems occur with such a combination of ceramic components and metallic components.
  • ceramic components are extremely sensitive to brittle fracture, which is why point loads, bending and torsional stresses must be kept away from ceramic components. These components are also not designed for impact loads.
  • the invention is based on the object of designing a grinding surface of the generic type in such a way that longer service lives of the grinding surface but also simplification in terms of maintenance are achieved.
  • the invention therefore proceeds to form the grinding surface from a segment-like armor, which consists of a much more wear-resistant material, namely a ceramic material, than the fastening body on which the segments are attached.
  • This idea of the invention is, however, structurally supplemented by a largely form-fitting support of the segments, as a result of which the dynamic stress forces, such as circumferential, shear and shear forces, are absorbed by a corresponding form-fitting design of the fastening body of the segments.
  • the outer surface of the fastening body is given a step-like contour in axial section, the individual steps forming cylindrical surfaces of different diameters in a grinding roller.
  • This step-shaped contour can be provided in the case of a grinding roller on the base jacket, which is usually attached to the base body of the roller.
  • the thrust forces acting on the segments in the axial direction can be absorbed via the shoulders of the individual steps.
  • parallel keys are provided between the base casing and the segments, which prevent the screwed-on segments made of ceramic from shifting in the circumferential direction.
  • the feather keys are usually designed as metallic wedges or cuboids that fit into corresponding grooves in the base shell, e.g. are screwed in and protrude about half of their vertical extension freely beyond the cylindrical support surface of the base jacket and can form a positive fit with recesses in the end faces of the segments in this area.
  • the parallel keys can be assigned to the segments both individually and to a certain number of segments.
  • the segments can also be supported tangentially by corner areas of polygonal ring surfaces.
  • This constructive solution to absorbing dynamic forces in the tangential direction is based on the circular shape of a single cylinder surface, e.g. of the roll shell in radial section and replaces the circular arc with a straight line of the length of the corresponding ceramic element in the circumferential direction.
  • a step or shoulder is additionally formed, against which the corresponding ceramic segment is supported in order to absorb shear forces in the tangential direction.
  • the surfaces of the ceramic segments which are adjacent to one another in the area of this step therefore have a different radial dimension, since the outer grinding surface has a circular contour.
  • the longitudinal edges of the steps in the base or base body of the grinding roller run essentially axially parallel to the axis of the grinding roller. These longitudinal edges preferably form an angle of inclination in the range of approximately 5 ° to 45 °, preferably approximately 30 °, in relation to the grinding surface formed by the segments.
  • the shoulders of the steps stand perpendicular to the longitudinal edges and are aligned so that the axial forces can be absorbed.
  • the distance between the rocker arms and the grinding bowl is mechanically limited by stop screws or stop buffers so that there is always a minimal roller gap and no direct contact between the grinding surfaces.
  • a very similar concept of fastening the individual ceramic segments for the grinding surface of a grinding roller can also be implemented on the grinding path of the grinding plate.
  • a corresponding grinding plate made of iron material is laid out in the radial direction with a stepped surface.
  • These circular steps then in turn receive ceramic segments, which in this case can have a block-like radial cut.
  • the segments can also have step-like transitions on the grinding surface, for example in the range of 3 mm.
  • an aligned transition of the segments is advantageously preferred for a flat grinding surface.
  • a segmented, ceramic grinding surface enables the basic material of the roll shell to be made from cheap materials instead of expensive, hardened metal materials.
  • the base body therefore remains attached to the base body of the grinding roller and is not affected by it even when the grinding surface is replaced.
  • the annular segment and / or sector armoring of the grinding surfaces with ceramic material therefore leads to a cost reduction with regard to the wearing parts, the specific costs of e.g. DM / t / h in the range of about 40% of the previously applicable costs can be classified.
  • the invention therefore goes the way to use wear segments made of non-metallic materials, preferably highly wear-resistant ceramics, with the metallic base body or base jacket in such a way that, in addition to the purely static holding function of the segments, those occurring during the comminution process between the grinding roller and grinding bowl dynamic forces can be absorbed without affecting the static holding elements.
  • a roller mill 50 is shown schematically in elevation, which has an attached, integrated classifier 51.
  • grinding rollers 54 are arranged in the figure, which resiliently oppose the rocking lever 55 the regrind present on the grinding track can be pressed.
  • the grinding bowl 52 is usually set in rotation via a gear.
  • the streamlines with broken lines show the flow conditions of the air / dust mixture in the roller mill and the integrated classifier.
  • the area M is marked with a circle, which is decisive according to the invention with regard to the design of the grinding surfaces and is considered in more detail in the further exemplary embodiments.
  • FIG. 1b shows an axial section through a grinding roller 1.
  • the roller shell 4 is arranged on the base body, not shown, so that the grinding surface 3 comes to lie approximately parallel to the corresponding grinding surface of a grinding bowl. In the direction of the axis 2, the rocker arm for the grinding roller 1 would normally extend upwards.
  • the lower section of the roll shell 4 is shown in FIG. 2 on an enlarged scale.
  • the longitudinal edges 32 of the steps 12 form cylindrical surfaces which are covered with segments 10 made of a ceramic material.
  • the individual segments 10 are fixed by means of a screw 14 engaging in the base jacket 5 through an opening on the side of the grinding surface at approximately a right angle to the axis 2.
  • a screw 14 engaging in the base jacket 5 through an opening on the side of the grinding surface at approximately a right angle to the axis 2.
  • additional static Fixation can also be provided between the base jacket 5 and the inner surface of the respective segment 10, which additionally creates a material balance between unevenness of the adjoining surfaces.
  • the left side flanks of the segments lie at least partially and possibly up to approximately 80% of their extension against shoulders 13 in order to be able to absorb forces directed axially to the left.
  • the adjacent three rows of the segments 10 are bounded and fixed on the outside by an outer shoulder 20 and on the inside by an inner shoulder 19 of the base jacket 5.
  • 12 pins 17 are indicated on the annular circumferential steps. These pins are intended for engagement in the openings 16 of the wedge-shaped segments 10. In these cases, the static mounting takes place, as shown in FIG. 4a, via a nut 18.
  • the opening 16 can be closed, for example, by means of a plug 15 flush with the grinding surface 3.
  • the radial section through a roller jacket according to FIG. 4a shows the design of the bond between segments and base jacket 5 for absorbing forces in the circumferential or rotational direction D.
  • the inner end faces 24 of the segments 10 have L-shaped areas in the region of their abutments or L-complementary recesses 27.
  • the joint gap 31 formed between adjacent segments 10 at the abutting points 23 can be filled, for example, with ceramic adhesive 28, so that direct contact of the segments 10 with one another is prevented, but also a compensation is achieved on the grinding surface.
  • the feather keys 25 can expediently be present at the joints of two adjacent segments 10. However, it is also possible to assign a parallel key 25 of this type to a plurality of segments 10 for absorbing the tangential forces occurring thereon.
  • An adhesive layer 22 which may be present at the interface 21 between the segment and the base jacket 5 can also serve to compensate for unevenness in the material.
  • FIG. 4b schematically shows a radial section through the cylinder surface of a grinding roller that is comparable to FIG. 4a.
  • the tangential forces which act on the ceramic segments 10 are absorbed by means of an alternative construction.
  • the circular cylindrical surface of the individual steps 12 according to FIG. 3 are formed in the example according to FIG. 4b by a polygon of individual straight lines 34, the latter forming a step 35 at the transition to the subsequent straight line 34 '. Since the radial height 36 'of the ceramic element 10 is kept larger than its radial height 36, the radially inner region 37 of the respective ceramic segment 10 is supported in the circumferential direction against the step 35, which can be incorporated directly into the support body 5.
  • the feather keys according to FIG. 4a can therefore be replaced in a simple and advantageous manner by means of such a polygonal ring surface.
  • the ring structure of the ceramic segments 10 is therefore automatically secured against twisting with respect to the metallic base jacket by the double support against dynamic stresses in the axial and tangential direction.
  • Such twisting of individual segments was previously conceivable in that, when the roller shell and grinding bowl were paired, no pure rolling movement occurred over the entire shell width, if not accidentally the axes of rotation of the roller shell and the grinding bowl in met at a point on the grinding track level.
  • the interaction of feather keys 25 and shoulders 13 or the design as a polygonal ring surface 38 therefore allows the armoring of the grinding surface to be designed with ceramic segments 10 as well, with serious advantages compared to conventional roller shells.
  • FIG. 5a initially shows a "spider web-shaped" arrangement of the individual segments 41 on the grinding plate 40.
  • the segments 41 of the grinding surface 49 have a trapezoidal contour in plan view, as shown in FIG. 5b, the outer segments being larger Have polygon lines.
  • the grinding bowl 52 receives a metallic grinding plate 40 in the sense of an insert.
  • the surface of the grinding plate 40 itself is designed with step-like sections 43.
  • the steps 43 go over shoulders 42 into the adjacent step.
  • Ceramic segments 41 are positively fixed on these steps 43.
  • This fixation is expediently carried out analogously to the fixation of the segments 10 on the base jacket 5.
  • the segments 41 have a square contour and lie positively against the shoulders 42 or longitudinal edges of the steps 43.
  • the segments 41 go along in the radial direction of the grinding bowl slight protrusions 44 of, for example, 1 mm to 3 mm into the next segment 41.
  • the grinding track surface 49 accordingly has a step-like contour.
  • flat grinding track surfaces with a continuous grinding surface transition from segment to segment can also be built.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)

Claims (8)

  1. Surfaces de broyage pour broyeurs à rouleaux et/ou pour une piste de broyage dans le cas de broyeurs à rouleaux ou de broyeurs à cylindres, avec des corps de fixation (5 ; 40) en fer ou en une matière analogue, la surface de broyage (3 ; 49) présentant un blindage disposé sous forme de segment sur son corps respectif de fixation (5 ; 40), blindage en une matière essentiellement plus résistante à l'usure comme le corps de fixation (5 ; 40) et les segments (10 ; 41) étant fixés par interpénétration par la forme et leurs surfaces extérieures formant sur toute la surface la surface de broyage (3 ; 49), caractérisées en ce que les segments (10 ; 41) sont en une matière céramique ou une composition céramique, en ce que la fixation par interpénétration par la forme des segments (10 ; 41) contre les forces dynamiques de sollicitations au moins dans le sens radial de la surface de la piste de broyage (49) du broyeur à rouleaux ou du broyeur à cylindres, la face, tournée vers la surface de broyage (3 ; 49) du corps de fixation (5 ; 40) d'un broyeur à rouleaux (1) ou d'un broyeur à disques (40) présente en section axiale au moins un gradin (12, 20 ; 43, 42) servant d'appui aux segments (10 ; 41) du blindage contre les épaulements (13 ; 42) du gradin (12, 20 ; 43, 42) et en ce que les segments (10) sont assurés au moins dans la zone de leurs ouvertures de joints (31) contre les forces dynamiques tangentielles par des clavettes parallèles (25), qui sont fixées dans le corps de fixation (5) et viennent en prise largement par interpénétration par la forme dans des encoches des segments (10) du côté frontal.
  2. Surface de broyage selon la revendication 1, caractérisée en ce que l'arête longitudinale (32) du gradin correspondant (12) forme un angle d'inclinaison α, en particulier dans la tranche de 5° à 45° par rapport à la surface de broyage (3).
  3. Surface de broyage selon l'une des revendications 1 ou 2, caractérisée en ce que les segments (10) sont assurés au moins dans la zone de leurs ouvertures de joint (31) contre les forces dynamiques tangentielles par interpénétration par la forme à travers les zones angulaires (35) d'une surface annulaire polygonale (38).
  4. Surface de broyage selon l'une des revendications 1 à 3, caractérisée en ce que les segments (10 ; 41) sont fixés par leurs faces internes (24) par interpénétration par la force au moyen d'une liaison par vis, par soudage et/ou par collage sur l'enveloppe de base (5) ou sur le disque de broyage (40).
  5. Surface de broyage selon l'une des revendications 1 à 4, caractérisée en ce que les segments (10 ; 41) et le broyeur à rouleaux (1) forment plusieurs corps annulaires polygonaux, qui produisent, en coupe axiale des anneaux cylindriques de diamètres différents se joignant les uns les autres par leur face interne.
  6. Surface de broyage selon l'une des revendications 1 à 5, caractérisée en ce que le corps de fixation (5) d'un broyeur à rouleaux (1) est le corps de base ou une enveloppe de base (5) du broyeur à rouleaux (1).
  7. Surface de broyage selon l'une des revendications 1 à 6, caractérisée en ce que des ouvertures (31) entre les segments (10) sont remplies d'un liant céramique (28).
  8. Surface de broyage selon l'une des revendications 4 à 7, caractérisée en ce que des orifices (16) pour des vis de liaison sont encapsulés dans les segments (10) en affleurant très sensiblement à la surface de broyage (3).
EP90112285A 1989-06-29 1990-06-27 Surfaces de broyage pour broyeurs à rouleaux Expired - Lifetime EP0405518B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE9007658U DE9007658U1 (de) 1989-06-29 1990-06-27 Mahlfläche von Wälzmühlen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3921419 1989-06-29
DE3921419A DE3921419A1 (de) 1989-06-29 1989-06-29 Mahlflaeche von waelzmuehlen

Publications (3)

Publication Number Publication Date
EP0405518A2 EP0405518A2 (fr) 1991-01-02
EP0405518A3 EP0405518A3 (en) 1991-06-12
EP0405518B1 true EP0405518B1 (fr) 1994-04-20

Family

ID=6383936

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90112285A Expired - Lifetime EP0405518B1 (fr) 1989-06-29 1990-06-27 Surfaces de broyage pour broyeurs à rouleaux

Country Status (5)

Country Link
US (1) US5114082A (fr)
EP (1) EP0405518B1 (fr)
JP (1) JPH0347543A (fr)
DE (2) DE3921419A1 (fr)
ZA (1) ZA904865B (fr)

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CN102151591A (zh) * 2011-03-25 2011-08-17 南通高欣金属陶瓷复合材料有限公司 中速磨煤机陶瓷复合磨辊
CN102179277A (zh) * 2011-03-25 2011-09-14 南通高欣金属陶瓷复合材料有限公司 中速磨煤机陶瓷复合衬板

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EP2540396A1 (fr) * 2011-06-30 2013-01-02 Bühler AG Procédé et dispositif de fabrication de farine et/ou de semoule
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CN105126959B (zh) * 2015-08-28 2018-05-29 南通高欣耐磨科技股份有限公司 一种可拆卸式陶瓷合金复合磨辊的制造方法
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CN106513107A (zh) * 2016-11-15 2017-03-22 昆明理工大学 一种复合挤压辊及其制备方法
CN106925383B (zh) * 2017-05-08 2022-09-30 佛山科学技术学院 一种粉磨设备上用的特殊辊轮
CN107081192A (zh) * 2017-05-18 2017-08-22 广东博晖机电有限公司 一种用于陶瓷原料颗粒研磨的耐磨衬板
KR200486030Y1 (ko) * 2017-12-20 2018-03-26 윤석상 미분기내 화재 방지를 위한 부착형 세라믹 라이너
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Publication number Priority date Publication date Assignee Title
CN102151591A (zh) * 2011-03-25 2011-08-17 南通高欣金属陶瓷复合材料有限公司 中速磨煤机陶瓷复合磨辊
CN102179277A (zh) * 2011-03-25 2011-09-14 南通高欣金属陶瓷复合材料有限公司 中速磨煤机陶瓷复合衬板

Also Published As

Publication number Publication date
EP0405518A3 (en) 1991-06-12
EP0405518A2 (fr) 1991-01-02
ZA904865B (en) 1991-03-27
DE3921419C2 (fr) 1991-11-21
US5114082A (en) 1992-05-19
DE59005413D1 (de) 1994-05-26
JPH0347543A (ja) 1991-02-28
DE3921419A1 (de) 1991-01-10

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