EP0288565A1 - Broyeur tubulaire a bille - Google Patents

Broyeur tubulaire a bille Download PDF

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Publication number
EP0288565A1
EP0288565A1 EP87900348A EP87900348A EP0288565A1 EP 0288565 A1 EP0288565 A1 EP 0288565A1 EP 87900348 A EP87900348 A EP 87900348A EP 87900348 A EP87900348 A EP 87900348A EP 0288565 A1 EP0288565 A1 EP 0288565A1
Authority
EP
European Patent Office
Prior art keywords
holes
partition
chamber
ball mill
grinding
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.)
Withdrawn
Application number
EP87900348A
Other languages
German (de)
English (en)
Other versions
EP0288565A4 (fr
Inventor
Vasily Stepanovich Bogdanov
Nikolai Stepanovich Bodganov
Nikolai Dmitrievich Vorobiev
Alexandr Dmitrievich Netesin
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.)
Belgorodsky Tekhnologichesky Institut Stroitelnykh Materialov Imeni Iagrishmanova
Original Assignee
Belgorodsky Tekhnologichesky Institut Stroitelnykh Materialov Imeni Iagrishmanova
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
Application filed by Belgorodsky Tekhnologichesky Institut Stroitelnykh Materialov Imeni Iagrishmanova filed Critical Belgorodsky Tekhnologichesky Institut Stroitelnykh Materialov Imeni Iagrishmanova
Publication of EP0288565A1 publication Critical patent/EP0288565A1/fr
Publication of EP0288565A4 publication Critical patent/EP0288565A4/fr
Withdrawn legal-status Critical Current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
    • 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 devices for the comminution of goods and relates in particular to ball mills.
  • a tubular ball mill which contains a cylindrical housing, in which an inclined partition is arranged, which has the shape of an ellipse and separates the cylindrical housing into a coarse and a fine grinding chamber, which are filled with grinding media.
  • the housing of the tube K ugelmühle is closed on the end faces with plates, supported in bearings and kinematically connected to a drive for rotation about its longitudinal axis.
  • the sloping partition is provided with holes, which are formed in the contact area of its surface with the grinding elements arranged in the coarse grinding chamber. These holes are parallel to each other along the small elliptical axis of the sloping partition (author's document no. 961761, issued in the USSR and published in the Bulletin of Discoveries, Inventions, Utility Models, trademark No. 36, September 30, 1982).
  • the holes have an insufficient width for the passage of the particles through the partition and as a result they are conveyed back into the coarse painting chamber, as a result of which the transmission capacity of the partition and consequently the mill throughput are reduced.
  • the invention has for its object to provide a stirred ball mill in which the inclined partition wall, through which the housing is divided into a fine and a coarse grinding chamber, has such a design that its maximum transmission capacity is guaranteed.
  • the through-holes have a length which essentially extends over their width and with its long side lies essentially parallel to the outer contour of the inclined partition.
  • the length of each through hole should expediently be more than 25 times its width.
  • the short sides of the through holes in the inclined partition wall are also expediently protruded toward the fine grinding chamber.
  • Such a design improves the penetration of the regrind particles through the through holes and extends the service life of the inclined partition as a whole.
  • the through holes are formed with an extension toward the fine grinding chamber, for which purpose the side of the through hole closer to the outer contour of the inclined partition wall forms an angle with the plane perpendicular to the surface of the inclined partition wall, which corresponds to the angle of inclination of this partition wall to the longitudinal axis of the tube mill .
  • the tubular ball mill according to the invention ensures maximum passage of the ground material through the inclined partition, the return of the ground material from the fine grinding chamber into the coarse grinding chamber is kept to a minimum, and a minimum flow resistance is ensured, which in turn increases the throughput of the tubular ball mill.
  • the tubular ball mill contains a cylindrical lined drum 1 (FIG. 1, FIG. 2) that. hereinafter referred to as drum 1, which is mounted with its pin 2 in bearings (not shown) and kinematically connected to a drive (not shown) for its rotation.
  • drum 1 a cylindrical lined drum 1
  • an oblique partition 3 is attached, which is hereinafter referred to as a partition, which is arranged under a angle ⁇ to the longitudinal axis 4 of the drum 1 and has the shape of an ellipse.
  • the cavity 3 of the drum 1 is divided into a coarse grinding chamber 5 and a fine grinding chamber 6 by the partition 3.
  • Each of the chambers is filled with grinding media 7 and 8 accordingly.
  • the grinding media 7 are somewhat larger than the grinding media 8.
  • the contact area 9 (FIG. 3) of the surface of the partition 3 with the grinding elements 7 arranged in the coarse grinding chamber 5 is limited by an imaginary line 10 and the outer contour 11 of the partition 3 is limited.
  • passage holes 12 are formed for the passage of the regrind particles (not shown) through the partition 3.
  • the holes 12 have a length "1", which substantially scans their width "a”.
  • the holes 12 are arranged such that their long sides 13 are substantially parallel to the contour 11 of the partition 3.
  • the short sides 14 of the holes 12 are chamfered towards the fine grinding chamber 6 in the direction of movement of the regrind particles shown by the arrow 15 (FIG. 4) through the holes 12 of the partition 3.
  • their length "1" should be at least 25 times their width "a", which corresponds to a rotational speed of the drum 1 of 0.6 of the critical value.
  • the length "1" of each hole should be at least 40 times its width "a".
  • the partitions 3 with the holes 12, which are located only in the contact area 9 of the partition wall surface with the grinding media 7 in the coarse grinding chamber 5, are expediently arranged in ball mills which are used for wet grinding.
  • the through holes 12a are formed with an extension to the fine grinding chamber 6 (FIG. 1).
  • the side 13 (FIG. 5) of the hole 12a forms an angle ⁇ with the plane 16 perpendicular to the surface of the partition 3, which corresponds to the angle of inclination ⁇ (FIG. 1) of the partition 3 to the longitudinal axis 4 of the drum 1, and the side 13a (FIG. 5) is perpendicular to the surface of the partition 3.
  • Such a design of the Löcner 18 in the area 17 of the dividing wall 3 achieves a minimal flow resistance of the dividing wall 3 when the suction air flows through it from the chamber 5 into the chamber 6, thereby improving the suction conditions as a whole and increasing the effectiveness of the grinding process.
  • the return flow of the regrind is prevents particles from the fine grinding chamber 6 into the coarse grinding chamber 5.
  • the direction of rotation of the drum 1 (FIG. 1) is indicated by the arrow 22.
  • the tubular ball mill works as follows.
  • the grinding media 7 When the drum 1 rotates, the grinding media 7 leave a track in the coarse grinding chamber 5 on the surface of the dividing wall 3 (per one drum revolution), which is delimited by the line 10.
  • the level of the grinding media 7 changes from the maximum h 1 (FIG. 1) to the minimum h 2 (FIG. 2).
  • the particles of the material which is fed through a loading opening in the spigot 2 move during the grinding process in the mass of the grinding media 7 and reach the partition 3. Together with the material to be ground, the grinding media 7 slide along the surface of the partition 3 in the area 9 in in the direction shown by the arrow 15, the good particles located above the holes 12 reaching the short side 14 of the hole 12 and falling under the action of gravity through the holes 12 into the fine grinding chamber 6.
  • the good particles enter the mass of the body 8, where they are finally comminuted to the finished product quality.
  • the passage of the regrind particles is improved by the selected length "1", width "a” and cross-sectional shape of the holes 12, 12a and their blocking by fragments of the grinding media 7 is prevented.
  • the suction air flows from the chamber 5 above the grinding media 7 into the chamber 6 and is further expelled into the atmosphere via an emptying opening in the peg 2a, dedusting devices and a fan (not shown) and the finished product is passed into a bunker.
  • holes 18 prevents the regrind of the regrind particles from the chamber 6 into the chamber 5, which increases the effectiveness of the grinding process and increases the throughput of the mill as a whole.
  • the holes 18 present in the partition 3 allow a larger amount of suction air to flow through the partition 3 from the chamber 5 into the chamber 6, which also improves the grinding conditions in the mill.
  • the direction of the side 13 of the hole 12 and the direction of movement 15 of the regrind particles through the partition wall from the chamber 5 into the chamber 6 match, whereby the regrind particles can pass through the holes 12 unhindered.
  • the tubular ball mill according to the invention has a minimum flow resistance and a maximum throughput, which increases the effectiveness as a whole.
  • the present invention will be used in the cement industry, mining, and other industries for fine comminution of goods.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)

Abstract

Broyeur tubulaire à bille, dans lequel une séparation inclinée (3), qui divise le broyeur en des chambres de broyage grossier et fin (5, 6), remplies de corps de broyage, est pourvue d'ouvertures traversantes (12) permettant le passage du matériau et situées dans la zone (9) de contact entre la surface de la cloison (3) entre les chambres et les corps de broyage contenus dans la chambre de broyage grossier. Les ouvertures traversantes (12) ont une longueur (l) qui dépasse sensiblement leur largeur (a) et sont orientées par leur côté le plus long (13) sensiblement parallèlement au contour externe (11) de la cloison inclinée.
EP19870900348 1986-10-21 1986-10-21 Broyeur tubulaire a bille. Withdrawn EP0288565A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SU1986/000102 WO1988003055A1 (fr) 1986-10-21 1986-10-21 Broyeur tubulaire a bille

Publications (2)

Publication Number Publication Date
EP0288565A1 true EP0288565A1 (fr) 1988-11-02
EP0288565A4 EP0288565A4 (fr) 1989-10-04

Family

ID=21617044

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870900348 Withdrawn EP0288565A4 (fr) 1986-10-21 1986-10-21 Broyeur tubulaire a bille.

Country Status (6)

Country Link
US (1) US4949907A (fr)
EP (1) EP0288565A4 (fr)
JP (1) JPH01500973A (fr)
DK (1) DK328988A (fr)
HU (1) HU199314B (fr)
WO (1) WO1988003055A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0319579B1 (fr) * 1987-01-23 1991-03-20 Belgorodsky Tekhnologichesky Institut Stroitelnykh Materialov Imeni I.A.Grishmanova Broyeur tubulaire a boulets
US5238195A (en) * 1991-07-30 1993-08-24 Knez Building Materials Company Method for recycling wallboard
US5183213A (en) * 1991-07-30 1993-02-02 Knez Building Materials Company Method for recycling wallboard
WO2012131998A1 (fr) * 2011-03-31 2012-10-04 有限会社大東土木 Broyeur
US20160030944A1 (en) * 2014-08-04 2016-02-04 General Electric Company Attritor
US20220088608A1 (en) * 2020-09-22 2022-03-24 Divergent Technologies, Inc. Methods and apparatuses for ball milling to produce powder for additive manufacturing

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US983069A (en) * 1910-01-05 1911-01-31 Smidth & Co As F L Tube-mill.
US1279335A (en) * 1918-01-19 1918-09-17 Harry W Hardinge Conical mill.
US1683627A (en) * 1919-12-31 1928-09-11 Alexander M Read Pulverizing machine
US2931583A (en) * 1957-05-21 1960-04-05 American Brake Shoe Co Grinding mills
US3624797A (en) * 1969-12-11 1971-11-30 Allis Chalmers Mfg Co Multiple compartment grinding mills
CA1036565A (fr) * 1973-09-10 1978-08-15 F.L. Smidth And Co. Of Canada Broyeur a tubes
SU733727A1 (ru) * 1977-12-02 1980-05-15 Харьковский инженерно-строительный институт Шарова мельница
SU961761A1 (ru) * 1979-11-30 1982-09-30 Белгородский технологический институт строительных материалов им.И.А.Гришманова Межкамерна перегородка

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8803055A1 *

Also Published As

Publication number Publication date
DK328988D0 (da) 1988-06-16
HUT46568A (en) 1988-11-28
EP0288565A4 (fr) 1989-10-04
US4949907A (en) 1990-08-21
WO1988003055A1 (fr) 1988-05-05
DK328988A (da) 1988-06-16
HU199314B (en) 1990-02-28
JPH01500973A (ja) 1989-04-06

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