US3924814A - Arrangement in grinding mills - Google Patents

Arrangement in grinding mills Download PDF

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Publication number
US3924814A
US3924814A US499918A US49991874A US3924814A US 3924814 A US3924814 A US 3924814A US 499918 A US499918 A US 499918A US 49991874 A US49991874 A US 49991874A US 3924814 A US3924814 A US 3924814A
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US
United States
Prior art keywords
mixed material
discharge pipe
mill
grinding chamber
finely ground
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
US499918A
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English (en)
Inventor
Per Anders Herman He Fahlstrom
Erik Alfon Jonsson
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Boliden AB
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Boliden AB
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Publication date
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Publication of US3924814A publication Critical patent/US3924814A/en
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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
    • B02C17/18—Details

Definitions

  • ABSTRACT A material discharging device for a drum-type continuous grindingmill having an end wall associated with outlet means for discharging from the mill grinding chamber a relatively finely ground material and a mixed material containing both relatively finely ground material and relatively coarse material.
  • the mixed material outlet means comprises outlet openings connecting the chamber with duct means for carrying the mixed material discharged through said outlet openings to an axial discharge pipe.
  • the discharge pipe is associated with a two-way valve, the one setting of which returns the arriving mixed material to the chamber and the other setting discharges the arriv. ing mixed material from the mill shielded by said discharge pipe from the flow of relatively finely ground material leaving the mill.
  • the present invention relates to a device in a drum mill for continuous grinding and of the type including an essentially cylindrical casing and end walls at the ends of said casing, one end wall being associated with outlet means for discharging from the grinding chamber of said mill a relatively finely ground material and a mixed material containing both relatively finely ground material and relatively coarse pieces of material, at least the outlet means for the mixed material including a number of outlet openings connecting the grinding chamber with at least one duct for carrying the mixed material discharged from the grinding chamber towards the centre of said one end wall.
  • grinding mills of the aforementioned type which may comprise autogeneous or semi-autogeneous grinding mills but also grinding mills where the grinding action is mainly effected by foreign grinding bodies, such as grinding balls
  • the discharged coarse material which can be composed of relatively large pieces of such material undergoing grinding in the mill or of foreign grinding bodies charged to the mill and having been worn down to such an extent that they no longer cause the desired grinding action in the mill, can be intended for use in one or more subsequent grinding units wherein said discharged fine material shall be further ground and/or other material than said fine material shall be ground.
  • the object of the invention is to provide a new operationally reliable and cheap device of simple design which is particularly useable in practice for conducting material from mills of the type in question, said device not being burdened with the aforementioned inconveniences.
  • the said duct in the central region of said one end wall opens out into a discharge pipe which is associated with a two-way valve for conducting the mixed material arriving from the duct either back again to, or in a direction from the grinding chamber and which shields the outgoing flow of mixed material from the flow or relatively finely ground material discharged from the grinding chamber.
  • FIG. 1 shows diagrammatically an axial sectional 'view of the discharge portion of a drum mill having a device according to the invention.
  • FIG. 2 is a sectional view taken through the line IIII in FIG. 1.
  • FIG. 3 shows diagrammatically an axial sectional view of the discharge trunnion of a drum mill incorporating an alternative embodiment of the device accordingto the invention.
  • FIGS. 1 and 2 which show portions of the discharge end of an autogeneous grinding mill 10, the end wall and the cylindrical casing of the mill at the discharge end thereof are indicated by the numerals 11 and 12, respectively.
  • the casing of the mill is internally lined with a rubber lining l3 and is provided with a number of lifting bars or lifters 14, which project above said lining and which in the same way chiefly consist of rubber.
  • the end wall 11 is also provided with a lining 15 consisting of a number of sector-shaped plates from which project radially positioned webs 16 which carry flange portions 17 on their edges facing the interior of the mill, said flange portions carrying in turn an inner wall 18 consisting of sector-shaped rubber plates.
  • the inner wall 18 is provided with a.
  • the inner wall 18 is provided with groups of openings 22, 23.
  • the smallest cross dimension of the openings 23 is nor- 'mally about 5 to 10 times larger than the smallest cross dimension of the openings 22.
  • the openings 22 normally have a smallest cross dimension of the order of 8-16 mm, e.g. approximately 12 mm, whilst the openings 23 suitably may have a smallest cross dimension of between and 100 mm, e.g. approximately mm.
  • the spaces 21 receiving material via the openings 23 form ducts for conducting mixed material towards the centre region of end wall 11 and open out into a common discharge pipe 25 which is associated with a twoway valve generally designated by 26 for conducting the mixed material arriving from the ducts 21 either back to or in a direction from the grinding chamber 24.
  • the pipe 25 shields the outgoing flow of mixed material from the flow of fine material fed out from the grinding chamber, said fine material passing into the spaces through the openings 22.
  • the spaces 20 also form ducts for conducting the fine material towards the central region of the end wall 11 and open out in a pipe 28 forming a lining in the mill trunnion 27 and surrounding the discharge pipe essentially coaxially therewith.
  • the pipes 25 and 28 open out via separate discharge hoppers 30 and 29, respectively, into a stationary material receiving device 31 connected to the discharge end of the mill trunnion.
  • a stationary material receiving device 31 connected to the discharge end of the mill trunnion.
  • the valve 26 includes a rod-like part 34 extending through a cylindrical valve housing 35, which via hopper-like portions 36 communicates with the spaces 21.
  • a cylindrical valve housing 35 which via hopper-like portions 36 communicates with the spaces 21.
  • two valve discs or plates 37,38 mounted on the part 34 are two valve discs or plates 37,38, by means of which the one or the other of the end openings of the valve housing can be closed.
  • the valve rod 34 is connected, via a power transmitting device in the form of an extension 39, to the piston rod of a valve setting device designed as a pressure cylinder 40 carried by the device 31 and situated outside the mill.
  • the valve rod 34 is adjustable by means of pressure cylinder 40 between the position shown by full lines in which the valve plate 38, by abutment against the end of the cylindrical valve housing facing the grinding chamber 24 of mill 10, closes the spaces 21 against said grinding chamber, and a position shown by chain lines in which the valve plate 37 closes the axially outer opening of valve housing 35 and the valve plate 38 is located at a distance from the axially inner opening of the valve housing 35 so that the material which has come into the spaces 21 can pass back again into the grinding chamber of the mill 10.
  • In the discharge pipe 25 are arranged radial supporting struts 41, sup porting a pipe 42 in which the extension 39 is displaceably mounted.
  • the discharge pipe 25 is supported in its turn by supporting struts 43 extending between the pipes 25 and 28.
  • the portion of the extension 39 located between the valve plate 37 and the inner end of the pipe 42 is protected by means of a sealing bellows 44.
  • a coupling 45 is arranged between the outer end of the extension 39 and the piston rod of the cylinder.
  • the two-way valve 26 is only provided with one valve plate 37, the latter being displaceable between the position shown by full lines in which mixed material can be fed out through the discharge pipe 25, and the position shown by chain lines in which mixed material arriving through the hopper-like portion 36 is returned to the grinding chamber 24.
  • the discharge pipe 25 is also provided with sieve openings 46 by means of which the mixed material departing through the pipe 25 is freed from water and undesired finely particulate portions, which are conducted to the fine material departing through the pipe 28.
  • shielding means in the form of circumferentially extending collars which prevent the inflow of water and fine material into the pipe 25 from the pipe 28.
  • means 48 are arranged for slowing down the mixed material flow, the separation of water and fine material being enhanced thereby.
  • These means 48 are shown to have the form of a spiral, which is so arranged on the inside of the pipe 25 that it feeds the material towards the discharge end of the pipe 25 although whilst causing certain slowing down and restratification of the material.
  • a device in a drum mill for continuous grinding and of the type including an essentially cylindrical casing and end walls, at the ends of said casing, one end wall being associated with outlet means for discharging from the grinding chamber of said mill a relatively finely ground material and a mixed material containing both relatively finely ground material and relatively coarse pieces of material, at least the outlet means for the mixed material including a number of outlet openings connecting the grinding chamber with at least one duct for carrying the mixed material discharged from the grinding chamber towards the centre of said one end wall, wherein said duct in the central region of said one end wall opens out into a discharge pipe which is associated with a two-way valve for conducting the mixed material arriving from said duct either back again to, or in a direction from the grinding chamber and which shields the outgoing flow of mixed material from the flow of relatively finely ground material discharged from the grinding chamber.
  • a device wherein the discharge pipe at least along a portion of its length extends essentially coaxially inside an outer pipe for discharging the relatively finely ground material from the mill, said pipes each opening out into its own material receiving device.
  • a device according to claim 1, wherein the discharge pipe for mixed material is provided with sieve openings to lead liquid and finely particulate material from the mixed material passing through said pipe.
  • a device wherein said openings are arranged in a portion of the discharge pipe for mixed material surrounded by an outer discharge pipe.
  • a device wherein the discharge pipe for mixed material is coordinated with shielding means to hinder the inflow of fine material and liquid from the outer discharge pipe into the discharge pipe for mixed material.
  • a device wherein the discharge pipe for mixed material at least in the region of said sieve openings is provided with means for slowing down the flow of the mixed material.
  • valve comprises an adjustable valve member which is connected, via a power transferring device extending coaxially with and through the discharge pipe for mixed material, to a valve setting device located outside said discharge pipe.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
US499918A 1974-02-27 1974-08-23 Arrangement in grinding mills Expired - Lifetime US3924814A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7402593A SE7402593L (en, 2012) 1974-02-27 1974-02-27

Publications (1)

Publication Number Publication Date
US3924814A true US3924814A (en) 1975-12-09

Family

ID=20320341

Family Applications (1)

Application Number Title Priority Date Filing Date
US499918A Expired - Lifetime US3924814A (en) 1974-02-27 1974-08-23 Arrangement in grinding mills

Country Status (16)

Country Link
US (1) US3924814A (en, 2012)
JP (1) JPS5164663A (en, 2012)
AU (1) AU474760B2 (en, 2012)
BR (1) BR7409035A (en, 2012)
CA (1) CA1017310A (en, 2012)
DE (1) DE2441815A1 (en, 2012)
ES (1) ES430336A1 (en, 2012)
FI (1) FI268474A7 (en, 2012)
FR (1) FR2261812A1 (en, 2012)
GB (1) GB1431239A (en, 2012)
NO (1) NO141193C (en, 2012)
PH (1) PH10687A (en, 2012)
SE (1) SE7402593L (en, 2012)
SU (1) SU698520A3 (en, 2012)
ZA (1) ZA745451B (en, 2012)
ZM (1) ZM17074A1 (en, 2012)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3044636A1 (de) 1979-11-30 1981-08-27 Boliden AB, 11485 Stockholm Trommelmuehle fuer autogene oder halbautogene mahlung
AU580387B2 (en) * 1985-02-08 1989-01-12 Slegten Societe Anonyme Device for regulating the retention time of the material in a grinding mill
US5118043A (en) * 1988-04-05 1992-06-02 Olmar Ab Method and apparatus for autogenous comminution primarily of overcompetent, heterogeneous mineral material
US5518191A (en) * 1993-08-31 1996-05-21 Fryma-Maschinen Ag Agitator mill
RU2129046C1 (ru) * 1996-05-17 1999-04-20 Ястребов Константин Леонидович Мельница мокрого рудного самоизмельчения
WO2003004168A1 (fr) * 2001-07-04 2003-01-16 Hera, Hydrogen Storage Systems, Inc. Valve pour la decharge de poudres d'un broyeur a billes
CN102458662A (zh) * 2009-06-16 2012-05-16 奥图泰有限公司 安装在旋转研磨机中的浆料提升器
CN103041909A (zh) * 2013-01-11 2013-04-17 武汉理工大学 选矿磨矿中的粗粒度分级工艺

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0937503A1 (fr) 1998-02-20 1999-08-25 Magotteaux International S.A. Broyeur travaillant en voie humide muni de moyens de décharge

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2023331A (en) * 1933-02-21 1935-12-03 Lowenhielm Carl Gustaf Halvar Discharge means for ball or rod mills and the like
US2754067A (en) * 1950-05-26 1956-07-10 Monsanto Chemicals Wet-grinding apparatus
US2815176A (en) * 1955-04-06 1957-12-03 Kennedy Van Saun Mfg & Eng Apparatus for producing carbonaceous materials for electrodes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2023331A (en) * 1933-02-21 1935-12-03 Lowenhielm Carl Gustaf Halvar Discharge means for ball or rod mills and the like
US2754067A (en) * 1950-05-26 1956-07-10 Monsanto Chemicals Wet-grinding apparatus
US2815176A (en) * 1955-04-06 1957-12-03 Kennedy Van Saun Mfg & Eng Apparatus for producing carbonaceous materials for electrodes

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3044636A1 (de) 1979-11-30 1981-08-27 Boliden AB, 11485 Stockholm Trommelmuehle fuer autogene oder halbautogene mahlung
US4441659A (en) * 1979-11-30 1984-04-10 Marklund Olle E Arrangement in drum mills
AU580387B2 (en) * 1985-02-08 1989-01-12 Slegten Societe Anonyme Device for regulating the retention time of the material in a grinding mill
US5118043A (en) * 1988-04-05 1992-06-02 Olmar Ab Method and apparatus for autogenous comminution primarily of overcompetent, heterogeneous mineral material
US5518191A (en) * 1993-08-31 1996-05-21 Fryma-Maschinen Ag Agitator mill
RU2129046C1 (ru) * 1996-05-17 1999-04-20 Ястребов Константин Леонидович Мельница мокрого рудного самоизмельчения
WO2003004168A1 (fr) * 2001-07-04 2003-01-16 Hera, Hydrogen Storage Systems, Inc. Valve pour la decharge de poudres d'un broyeur a billes
CN102458662A (zh) * 2009-06-16 2012-05-16 奥图泰有限公司 安装在旋转研磨机中的浆料提升器
CN102458662B (zh) * 2009-06-16 2014-03-19 奥图泰有限公司 安装在旋转研磨机中的浆料提升器
CN103861700A (zh) * 2009-06-16 2014-06-18 奥图泰有限公司 安装在旋转研磨机中的浆料提升器
CN103861700B (zh) * 2009-06-16 2016-09-14 奥图泰有限公司 安装在旋转研磨机中的浆料提升器
CN103041909A (zh) * 2013-01-11 2013-04-17 武汉理工大学 选矿磨矿中的粗粒度分级工艺

Also Published As

Publication number Publication date
GB1431239A (en) 1976-04-07
ZM17074A1 (en) 1975-07-21
NO141193B (no) 1979-10-22
FR2261812A1 (en, 2012) 1975-09-19
DE2441815A1 (de) 1975-08-28
ZA745451B (en) 1975-09-24
CA1017310A (en) 1977-09-13
AU474760B2 (en) 1976-07-29
BR7409035A (pt) 1976-05-11
FI268474A7 (en, 2012) 1975-08-28
ES430336A1 (es) 1976-09-16
NO141193C (no) 1980-01-30
SE7402593L (en, 2012) 1975-08-28
AU7280074A (en) 1976-03-04
NO750251L (en, 2012) 1975-08-28
PH10687A (en) 1977-08-10
JPS5164663A (en, 2012) 1976-06-04
SU698520A3 (ru) 1979-11-15

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