EP0351305B1 - Trennungswand für eine zylindrische Kugelmühle - Google Patents

Trennungswand für eine zylindrische Kugelmühle Download PDF

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Publication number
EP0351305B1
EP0351305B1 EP89401985A EP89401985A EP0351305B1 EP 0351305 B1 EP0351305 B1 EP 0351305B1 EP 89401985 A EP89401985 A EP 89401985A EP 89401985 A EP89401985 A EP 89401985A EP 0351305 B1 EP0351305 B1 EP 0351305B1
Authority
EP
European Patent Office
Prior art keywords
bars
annular support
partition
partition according
row
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
EP89401985A
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English (en)
French (fr)
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EP0351305A3 (en
EP0351305A2 (de
Inventor
Benjamin Cambier
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.)
Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to AT89401985T priority Critical patent/ATE76333T1/de
Publication of EP0351305A2 publication Critical patent/EP0351305A2/de
Publication of EP0351305A3 publication Critical patent/EP0351305A3/fr
Application granted granted Critical
Publication of EP0351305B1 publication Critical patent/EP0351305B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/04—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with unperforated container
    • B02C17/06—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with unperforated container with several compartments

Definitions

  • the present invention relates to the grinding of materials, for example cement clinker or coal, using grinding bodies of the ball or bar or roller type in a cylindrical grinder rotating around its horizontal axis and comprising one or two or several compartments. It relates more particularly to a partition between two successive compartments or a finishing compartment.
  • ball and ball mill
  • ball will be used for simplification, to designate any grinding body placed freely inside a cylindrical mill to reduce the particle size of the material to be ground, by action of its mass and its surface during the rotation of the mill.
  • They can be spherical balls or cylindrical elements whose height is substantially equal to the diameter or possibly elements having another shape.
  • the mill is partially filled with balls of different sizes, each size corresponding to a main dimension of the balls which is substantially equal, in particular of an average diameter.
  • Grinders of a certain size most often have two or more compartments which each contain balls of different sizes, but whose sizes are adapted according to the particle size of the material to be ground in the compartment considered.
  • Two successive compartments are separated by a selective partition, also called a slit wall.
  • the function given to this partition is to let pass from the upstream compartment to the downstream compartment only the material whose particle size is less than a given dimension; thus the known structure of this partition is conditioned by this role of calibrating the material, as taught in patents FR-A-2 436 629 and FR-A-2 565 850. It consists of a chamber delimited by two integral walls of a axial cone.
  • the first wall is pierced with orifices intended to allow the material having a particle size less than a given dimension to penetrate from the upstream compartment into the chamber.
  • Inside the chamber can be provided means ensuring, during the rotation of the mill, the movement of the material towards the axial cone, along which the material slides towards the downstream compartment.
  • partition wall partition is firstly to maintain in each compartment the balls therein and secondly to ensure the passage of material from the upstream compartment to downstream compartment with the minimum of constraints, without any calibration of the material being sought during said passage.
  • Partition walls having rectilinear and parallel bars have already been produced in particular by patent US.A.1,362,334, each pair of two adjacent bars delimiting a light for passage of the material.
  • the bars being welded together, the partitions of this type are not easily adaptable. Furthermore, they have a small useful passage surface.
  • the partition comprises rectilinear and parallel bars, each pair of adjacent bars delimiting a lumen for passage of the material.
  • the bars are in the form of two parallel rows, the bars of the second row being offset transversely with respect to those of the first row so that a passing light is determined by a pair of two bars, one belonging to the first and the other to the second row, and the ends of the bars are fixed on an annular support fixed on the interior part of the shell of the mill.
  • the bars have circular, elliptical or octagonal sections.
  • the width of the lumen of passage of the material and therefore the spacing between two adjacent bars must be such that it does not allow the passage of the balls from one compartment to the other.
  • This spacing is determined according to the size of the balls placed in the two compartments on either side of the partition and also takes into account the normal wear of the balls during operation of the mill.
  • This particular arrangement also allows, by simple construction and starting from the same bars, to obtain a light for the passage of the material having an adaptable width. To do this, it suffices to adjust the spacing between the two rows of bars differently when they are fixed to the annular support.
  • the height of the annular support is between 15 and 30% of the internal diameter of the ferrule, preferably 26%.
  • the annular support may have a closed structure, that is to say not letting the material pass; it can also have an open structure, for example with radial or concentric slots over all or part of its height, the width of which is equivalent to that of the passage openings between the bars.
  • the partition shown in Figure 1 is arranged inside a cylindrical crusher perpendicular to its longitudinal axis 1 of rotation. It comprises bars 2 rectilinear and parallel to each other, fixed at their two ends to the support 3 by bolts 4.
  • the support 3 is itself fixed, by means not shown, to the shell 5 of the cylindrical crusher.
  • each bar 2 is a solid metal cylinder, 90 mm in diameter, the ends of which are bevelled to follow the annular curvature of the support 2.
  • Figure 2 shows the arrangement of bars 2 along the two rows.
  • the bars 2a of the first row are aligned in the same direction DD 'perpendicular to longitudinal axis 1 of the mill.
  • the bars 2 b of the second row are aligned in the same direction EE ′ parallel to the direction DD ′.
  • Figure 2 also shows the method of fixing a bar 2 on the support 3. The end of the bar 2 is notched on the one hand so as to apply flat on the adjustment plate 6 and on the other leaves so as to receive the head of the bolt 7.
  • the end of the bar 2 and the plate 6 are pierced with a smooth hole; the support 3 is pierced with a threaded orifice; bolt 7 passes through the smooth hole and the tapped hole and keeps blocked by the bolt 7, the bar 2, the plate 6 and the support 3.
  • the spacing between the two rows that is to say between the two directions DD ′ and EE ′ is around 90 to 115 mm.
  • the spacing between two adjacent bars of the same row 2 a or 2 b is 30 mm.
  • the spacing between two adjacent bars, one belonging to the first row 2 a and the other to the second row 2 b, is 25 mm. It is this latter spacing which constitutes the width of the lumen passing the material through the partition. This spacing is a function of the diameter of the balls or dimensions of the smallest grinding bodies. To vary this spacing, it is sufficient to interpose between the support 3 and the bars 2 of the adjustment plates 6 of a different thickness.
  • one or more stiffening elements placed between the two rows of bars are placed, the cross section of which is in the form of a cross and on which the bars of the two rows are supported. sort of maintaining a constant spacing between them despite the forces exerted during the operation of the mill.
  • the annular support 3, shown in Figure 1 has a structure called open lantern, it is constituted by the assembly by welding of elements of smaller dimensions, which are metal plates with large openings 9, thick 60 mm, in the form of arcs, so as to match the inner part of the ferrule 5.
  • the support 3 is lined with wear plates 10 which can be solid or perforated.
  • the thickness of these plates is defined by the alignment of these with bars 2 a and 2 b .
  • the height of these plates delimits an area of the partition through which the material cannot pass.
  • the balls placed on either side of the partition in their respective compartment are spherical balls of diameter 110 and 100 mm on one side and 90, 80, 70 and 60 mm on the other.
  • the circular shape of the section of the bars 2 or possibly elliptical is capable of causing the lowest pressure drop both for the passage of the material and for the flow of the ventilation air in the grinder.
  • Each bar 11 consists of two bar sections 11 a and 11 b fixed at one end 12 on the annular support 13 and the other end 14 of which is housed free in an intermediate support 15.
  • This support 15 consists of two notched shells , which are bolted together after positioning the ends 14 of the sections 11a and 11b in each of the corresponding notches.
  • the bar sections 11a and 11b can move in the notches under the effect of the stresses inherent in grinding without deformation of the partition itself.
  • a circular wear part 16 made of several removable elements covers the part corresponding to the fixing of the bars 11 on the annular support 13.
  • the wear plates 17 which protect the annular support are placed on either side of said support and bolted together by bolts 18 passing through.
  • the support is pierced with openings in which grids are housed 19.
  • the wear plates 17 are pierced with openings which face those of the support and whose dimensions are slightly smaller than those of the support openings, thereby ensuring the maintenance of the grids 19 by simple locking.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Combined Means For Separation Of Solids (AREA)

Claims (9)

1. Trennungswand für eine zylindrische Kugelmühle mit gradlinigen parallelen Stäben (2), wobei je ein Paar aus zwei benachbarten Stäben einen Materialdurchgangsspalt eingrenzt, dadurch gekennzeichnet, daß die Stäbe (2) in zwei parallelen Reihen angeordnet sind, wobei die Stäbe (2b) der zweiten Reihe quer gegenüber den Stäben (2a) der ersten Reihe so angeordnet sind, daß eine Durchgangsöffnung durch ein Paar zweier Stäbe definiert wird, wobei der erste Stab (2a) der ersten Reihe und der andere Stab (2b) der zweiten Reihe angehören, und dadurch, daß die Enden der Stäbe auf einem ringförmigen Träger (3) befestigt sind, der auf dem Innenteil des Rings (5) des Behälters befestigt ist.
2. Trennungswand nach Anspruch 1, dadurch gekennzeichnet, daß der ringförmige Träger (3) eine durchbrochene Struktur aufweist.
3. Trennungswand nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß der ringförmige Träger (3) massive oder mit Schlitzen versehene Verschleißplatten aufweist, wobei die Schlitze radial oder konzentrisch angeordnet sind und deren Breite etwa der der Durchgangsöffnungen zwischen den Stangen (2) entspricht.
4. Trennungswand nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß der ringförmige Träger (3) eine Höhe aufweist, die zwischen 15 und 30̸ % des Innendurchmessers des Rings (15) liegt, vorzugsweise bei 26 %.
5. Trennungswand nach Anspruch 4, dadurch gekennzeichnet, daß für eine Mühle mit einem Innendurchmesser von größenordnungsmäßig 4 m der ringförmige Träger eine Höhe in der Größenordnung von 60̸0̸ mm hat und die Stangen einen Durchmesser von größenordnungsmäßig 90̸ mm haben.
6. Trennungswand nach Anspruch 1, dadurch gekennzeichnet, daß die Stangen einen Durchmesser der Größenordnung 90̸ mm haben und der Abstand zwischen den Richtungen zweier Stangenreihen größenordnungsmäßig zwischen 90̸ und 115 mm liegt.
7. Trennungswand nach Anspruch 1, dadurch gekennzeichnet, daß jede Stange (11) zwei Stangenabschnitte (11a und 11b) aufweist, wobei ein Ende (12) eines jeden Abschnitts an dem ringförmigen Träger (13) befestigt ist und das andere Ende (14) frei in dem Zwischenträger (15) gelagert ist.
8. Trennungswand nach Anspruch 7, dadurch gekennzeichnet, daß der Zwischenträger (15) aus zwei gekerbten Schalen besteht, die miteinander nach der Anordnung der Enden (14) der Stababschnitte (11a und 11b) in den entsprechenden Kerben verbeult bzw. verschraubt werden.
9. Trennungswand nach Anspruch 1, dadurch gekennzeichnet, daß der Teil der Stangen (11), an dem die Stangen auf dem ringförmigen Träger (13) befestigt werden, mit einem kreisförmigen Verschleißteil bedeckt ist, das zum Heben der Kugeln geeignet geformt ist.
EP89401985A 1988-07-12 1989-07-11 Trennungswand für eine zylindrische Kugelmühle Expired - Lifetime EP0351305B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89401985T ATE76333T1 (de) 1988-07-12 1989-07-11 Trennungswand fuer eine zylindrische kugelmuehle.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8809751A FR2634142A1 (fr) 1988-07-12 1988-07-12 Cloison de separation d'un broyeur cylindrique a boulets
FR8809751 1988-07-12

Publications (3)

Publication Number Publication Date
EP0351305A2 EP0351305A2 (de) 1990-01-17
EP0351305A3 EP0351305A3 (en) 1990-10-10
EP0351305B1 true EP0351305B1 (de) 1992-05-20

Family

ID=9368552

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89401985A Expired - Lifetime EP0351305B1 (de) 1988-07-12 1989-07-11 Trennungswand für eine zylindrische Kugelmühle

Country Status (6)

Country Link
EP (1) EP0351305B1 (de)
AT (1) ATE76333T1 (de)
DE (1) DE68901591D1 (de)
ES (1) ES2033109T3 (de)
FR (1) FR2634142A1 (de)
GR (1) GR3005278T3 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107670782A (zh) * 2017-11-13 2018-02-09 盐城吉达环保设备有限公司 一种球磨机磨内均风装置
CN109926166A (zh) * 2019-04-28 2019-06-25 四川省星船城水泥股份有限公司 一种球磨机隔舱组件及球磨机

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1362334A (en) * 1919-03-10 1920-12-14 Frank E Marcy Ball-mill
US1444101A (en) * 1922-05-27 1923-02-06 Worthington Pump & Mach Corp Tube mill
SU623579A1 (ru) * 1977-02-24 1978-09-15 Государственный Всесоюзный Научно-Исследовательский Институт Цементной Промышленности "Ниицемент" Межкамерна перегородка трубной мельницы
SU795560A1 (ru) * 1979-03-21 1981-01-15 Белгородский Технологическийинститут Строительных Материалов Межкамерна перегородка дл ТРубНыХ МЕльНиц
DE3023311A1 (de) * 1980-06-21 1982-01-14 Draiswerke Gmbh, 6800 Mannheim Kugelmuehle mit entleerungseinrichtung
SU1031506A1 (ru) * 1982-03-24 1983-07-30 Белгородский технологический институт строительных материалов им.И.А.Гришманова Межкамерна перегородка

Also Published As

Publication number Publication date
EP0351305A3 (en) 1990-10-10
FR2634142A1 (fr) 1990-01-19
ES2033109T3 (es) 1993-03-01
EP0351305A2 (de) 1990-01-17
ATE76333T1 (de) 1992-06-15
GR3005278T3 (de) 1993-05-24
DE68901591D1 (de) 1992-06-25

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