EP0119694A2 - Tube broyeur à balayage pneumatique avec rotor séparateur incorporé - Google Patents

Tube broyeur à balayage pneumatique avec rotor séparateur incorporé Download PDF

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Publication number
EP0119694A2
EP0119694A2 EP84300456A EP84300456A EP0119694A2 EP 0119694 A2 EP0119694 A2 EP 0119694A2 EP 84300456 A EP84300456 A EP 84300456A EP 84300456 A EP84300456 A EP 84300456A EP 0119694 A2 EP0119694 A2 EP 0119694A2
Authority
EP
European Patent Office
Prior art keywords
chamber
discharge chamber
grinding chamber
rotor
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Withdrawn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
EP84300456A
Other languages
German (de)
English (en)
Other versions
EP0119694A3 (fr
Inventor
Jan Folsberg
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.)
FLSmidth and Co AS
Original Assignee
FLSmidth and Co AS
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 FLSmidth and Co AS filed Critical FLSmidth and Co AS
Publication of EP0119694A2 publication Critical patent/EP0119694A2/fr
Publication of EP0119694A3 publication Critical patent/EP0119694A3/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Withdrawn legal-status Critical Current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
    • 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
    • B02C17/18—Details

Definitions

  • the invention relates to a gas-swept tube mill of the kind,hereinafter referred to as of the kind described, having at least one tubular grinding chamber which is rotatable about its axis that is substantially horizontal; a discharge chamber which is positioned at an end of the grinding chamber and through which ground material is swept from the grinding chamber to an outlet; a separately drived separator rotor which is positioned in the discharge.chamber coaxially with the grinding chamber and has radially outwardly extending vanes; and a scooping device for returning insufficiently ground material from the discharge chamber to the grinding chamber.
  • the parts of the coarse fraction which are flung up into the upper part of the discharge chamber above the separator may, however, fall down into the separator to be flung out again in such a manner that an undesired recirculation of material may occur between the separator and the upper part of the wall of the discharge chamber.
  • the gas flow through the discharge chamber towards the mill outlet may tend to prevent material separated in the discharge chamber from moving back towards the scooping device, thus preventing renewed grinding of the material. This may also cause accumulation of material at the outlet end of the discharge chamber where that material may be carried upwards along the chamberwalldue to the mill rotation and cascade into the area of operation of the rotor so that in this way another undesired material recirculation may occur.
  • the object is achieved by a mill of the kind described, which is characterised in that a material-collecting casing is mounted on and circumferentially around the vanes of the separator rotor, the inner surface of the material-collecting casing being flared in the axial direction towards the scooping device and grinding chamber.
  • the separated coarse material fraction is collected by the material-collecting casing all the way round the rotor which rotates at a supercritical speed. Owing to the flared shape of the collecting casing, together with the effect of the centrifugal force on the individual particles of the coarse fraction, this material will be carried back in the discharge chamber in a direction towards the grinding chamber away from the rotor.
  • a spreading device through which material is swept from the grinding chamber into the discharge chamber, the spreading device being flared in the direction of flow to spread the material over the face of the rotor.
  • the spreader also inhibits the material separated by the separator rotor, and discharged from its flared casing, from falling down into the carrier gas flow towards the rotor if the spreader projects into the discharge chamber.
  • the mill comprises a tubular mill casing 1, an inlet 2 for raw material to be ground in the mill, and for conveying and drying gas, and an outlet 3 for gas and finish ground material.
  • the mill casing is rotatably supported to rotate about its axis, which is substantially horizontal, on slide shoe bearings, not shown, on which the mill casing slides via two slide rings 4.
  • the mill casing has a drying chamber 5, a grinding chamber 6 and a discharge chamber 7, all of which rotate together relatively to the inlet 2 and outlet 3.
  • a scooping device 8 In the diaphragm separating the drying chamber 5 and the grinding chamber 6 is mounted a scooping device 8.
  • Another scooping device 9 is mounted in the diaphragm separating the grinding chamber 6 from the discharge chamber 7.
  • a separator rotor 10 In the outlet end of the discharge chamber 7 is mounted coaxially a separator rotor 10, which is driven at supercritical speed via a shaft 11 from a driving mechanism, not shown.
  • the radial vanes of the separator rotor 10 are encompassed by and fixed to a frustoconical material-collecting casing 12.
  • a spreader device 13 which rotates with the rest of the mill casing, extends from the grinding chamber 6 and partly through the discharge chamber 7 and has afrustoconical part 14 widening towards the separator rotor 10.
  • the wall 15 of the discharge chamber is provided with substantially the same conicity as the collecting casing of the rotor 10.
  • the mill operates in the following way:-
  • the gas together with the suspended ground material flows from the grinding chamber 6 into the spreading device 13 to the discharge chamber 7 and further to the separator rotor 10 as shown by dotted arrows.
  • the separator rotor 10 divides the material suspension into a fine fraction, which is carried by the gas out through the mill outlet 3, and a coarse fraction, which,by the centrifugal effect,is carried onto the frustoconical collecting casing 12 of the rotor 10.
  • the rotor 10 runs at a supercritical speed its casing 12 collects the separated coarse material fraction which is thus prevented from falling back towards the rotor shaft. Due to the conicity of the collecting casing 12 and the action of the centrifugal forces on the particles of the coarse fraction, these particles are carried backwards, as indicated by full line arrows 16, in the discharge chamber 7 towards the scooping device 9, which scoops the coarse fraction from the discharge chamber 7 into the grinding chamber 6 for further grinding. The conicity of the discharge chamber wall 15 further improves the conveying of the coarse fraction from the separator rotor 10 towards the scooping device 9 0
  • the conically shaped part 14 of the spreading device 13 spreads the gas/material suspension across the face of the rotor and further inhibits the coarse material fraction :leaving the collecting casing 12af the rotor 10 from falling down into the gas stream passing through the discharge chamber 7 and the rotor 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
EP84300456A 1983-02-15 1984-01-25 Tube broyeur à balayage pneumatique avec rotor séparateur incorporé Withdrawn EP0119694A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB838304147A GB8304147D0 (en) 1983-02-15 1983-02-15 Gas-swept tube mill
GB8304147 1983-02-15

Publications (2)

Publication Number Publication Date
EP0119694A2 true EP0119694A2 (fr) 1984-09-26
EP0119694A3 EP0119694A3 (fr) 1986-08-13

Family

ID=10538020

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84300456A Withdrawn EP0119694A3 (fr) 1983-02-15 1984-01-25 Tube broyeur à balayage pneumatique avec rotor séparateur incorporé

Country Status (8)

Country Link
EP (1) EP0119694A3 (fr)
JP (1) JPS59156441A (fr)
BR (1) BR8400640A (fr)
ES (1) ES8506207A1 (fr)
GB (1) GB8304147D0 (fr)
IN (1) IN158722B (fr)
MX (1) MX157858A (fr)
ZA (1) ZA84280B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111318342A (zh) * 2020-03-24 2020-06-23 龙游讴凡纳米材料有限公司 一种可反复研磨的纳米砂磨机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1430432A (en) * 1922-04-18 1922-09-26 Attalus C Bittner Conical or cylinder grinding mill
US2185960A (en) * 1936-09-07 1940-01-02 Smidth & Co As F L Mill
US3231203A (en) * 1962-01-29 1966-01-25 Koppers Co Inc Grinding mill and process
US3718286A (en) * 1970-11-12 1973-02-27 Smidth & Co As F L Method and apparatus for grinding mineral materials
US3949940A (en) * 1973-03-23 1976-04-13 F. L. Smidth & Co. Tube mill

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1430432A (en) * 1922-04-18 1922-09-26 Attalus C Bittner Conical or cylinder grinding mill
US2185960A (en) * 1936-09-07 1940-01-02 Smidth & Co As F L Mill
US3231203A (en) * 1962-01-29 1966-01-25 Koppers Co Inc Grinding mill and process
US3718286A (en) * 1970-11-12 1973-02-27 Smidth & Co As F L Method and apparatus for grinding mineral materials
US3949940A (en) * 1973-03-23 1976-04-13 F. L. Smidth & Co. Tube mill

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111318342A (zh) * 2020-03-24 2020-06-23 龙游讴凡纳米材料有限公司 一种可反复研磨的纳米砂磨机

Also Published As

Publication number Publication date
IN158722B (fr) 1987-01-10
GB8304147D0 (en) 1983-03-16
JPS59156441A (ja) 1984-09-05
MX157858A (es) 1988-12-16
ES529626A0 (es) 1985-01-01
ZA84280B (en) 1984-08-29
ES8506207A1 (es) 1985-01-01
BR8400640A (pt) 1984-09-18
EP0119694A3 (fr) 1986-08-13

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Effective date: 19870522

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18D Application deemed to be withdrawn

Effective date: 19871002

RIN1 Information on inventor provided before grant (corrected)

Inventor name: FOLSBERG, JAN