EP0195614B1 - Rotierende Mühle mit Ladungssystem - Google Patents

Rotierende Mühle mit Ladungssystem Download PDF

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Publication number
EP0195614B1
EP0195614B1 EP86301864A EP86301864A EP0195614B1 EP 0195614 B1 EP0195614 B1 EP 0195614B1 EP 86301864 A EP86301864 A EP 86301864A EP 86301864 A EP86301864 A EP 86301864A EP 0195614 B1 EP0195614 B1 EP 0195614B1
Authority
EP
European Patent Office
Prior art keywords
valve
shell
mill
charging
loading
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
EP86301864A
Other languages
English (en)
French (fr)
Other versions
EP0195614A3 (en
EP0195614A2 (de
Inventor
James Charles Mehltretter
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.)
Huntington Alloys Corp
Original Assignee
Inco Alloys International Inc
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 Inco Alloys International Inc filed Critical Inco Alloys International Inc
Priority to AT86301864T priority Critical patent/ATE55281T1/de
Publication of EP0195614A2 publication Critical patent/EP0195614A2/de
Publication of EP0195614A3 publication Critical patent/EP0195614A3/en
Application granted granted Critical
Publication of EP0195614B1 publication Critical patent/EP0195614B1/de
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
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/02—Feeding devices
    • 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
    • B02C17/183—Feeding or discharging devices

Definitions

  • This invention relates to an improved system for charging materials to a container under a protective atmosphere. More particularly it relates to a valve system for charging particulate material to a batch-type rotary mill under seal to the air.
  • valve design In designing apparatus to be used for metals and other powders special consideration must be given to valve design when the powders will come in contact with a valve because the powders will find their way into valve parts and render the valve inoperable.
  • the components of the product are charged in powder form into a high energy milling device such as a ball mill where, in an environment free of or reduced in amount of free or combined oxygen, the powders that are dry or substantially dry are ground down to a very fine size initially, prior to particle agglomeration in the latter stages of the process.
  • This initial grinding increases the total surface area of the metallic powders significantly. Since any freshly exposed surface is not oxidized it is very hungry for oxygen to the extent that the powders in this condition will burn and/or might explode spontaneously if exposed to air.
  • any port in the mill for example, for charge or discharge of powders, is a source of potential danger from the standpoint of the quality of the product produced and the possibility of a fire and/ or an explosion.
  • the present invention involves a valve system for charging rotary mills in a manner which will protect the charge material and the environment in the mill during loading of the mill, while at the same time it is designed to minimize the problem of wear of the valve parts during operation of the mill.
  • the charge system of the present invention can be incorporated into existing batch-type rotary mills, permitting them to be charged and operated under protective conditions.
  • DE-A-3 241 784 describes an autoclave with a closable lid held inside the autoclave by a stem; the lid can be moved into the interior of the autoclave to open it and retracted against the autoclave wall to seal it.
  • US 4 054 292 describes a rotary mill in which material can be charged through a hollow trunnion at the end of the mill in an inert gas atmosphere. Such a mill is complicated and would require an elaborate feed system to ensure that the material fed into the mill does not come into contact with air.
  • the present invention is defined in claim 1.
  • a sealable charging means e.g. a receptacle sealable to the atmosphere mountable on the loading means, is preferably used to feed material to the loading means.
  • the valve system is designed so that in the open position the valve plug extends into the shell and in the closed position the valve plug seats sealably in the orifice with its inner face substantially continuous with the inner circumference of the shell, so that there are essentially no valve projections into the mill, which projections could be worn away by action of the mill.
  • the valve plug When the valve plug is closed during operation of the mill, the interior of the shell is essentially smooth and continuous.
  • the valve plug can be constructed of a material that is at least as wear resistant as the interior of the shell so that no greater wear would be attributable to the valve plug.
  • the shell (which is maintained sealed from the air) is rotated until the loading conduit is located in a generally vertical position at the side of the mill.
  • the design of the loading conduit makes it possible for the charge material to flow vertically downward into the mill when the loading conduit is at the side of the mill.
  • a charge receptacle containing the charge material is attached to the loading means at the entry port of the loading conduit.
  • the charge receptacle is sealed to the atmosphere, e.g. by means of a valve device which can be opened to permit flow of charge material to the mill.
  • the loading conduit is sealed from the charge receptacle and the shell, it can, if desired, be evacuated or purged, e.g. with a gas inert to the charge material, using apparatus suitably placed in the system. Then the valve plug is moved to the open position, e.g. extended into the mill shell so as to minimize retention of the charge material on the valve parts, and the valve of the charging receptacle is opened to permit the charge material to flow into and through the generally vertically disposed loading conduit into the shell.
  • the valve plug After charging the material into the shell, the valve plug is closed, the closure means sealably isolating the loading tube from the mill. Then the charging receptacle with its sealing means is removed from the mill. Thereafter the loading conduit can be resealed with the blind flange.
  • the present invention applies to batch-type grinding mills, e.g. ball mills, for processing particulate material.
  • the grinding media may be, for example, balls, rods, pebbles or other appropriate media.
  • the material processed in the mills may comprise elements, compounds, mixtures, alloys, ceramics and combinations thereof. Examples of elements which may be present as major or minor constituents of the product are nickel, copper, zinc, titanium, zirconium, niobium, molybdenum, vanadium, tin, aluminum, chromium, magnesium, lithium, iron, silicon, yttrium and rare earths, e.g.
  • cerium and lanthanum examples of compounds are oxides, nitrides and/or carbides of aluminum, magnesium, silicon, yttrium, cerium and lanthanum; examples of alloys are master alloys of aluminum-lithium and aluminum-magnesium.
  • the present invention is particularly useful when the material to be processed must be charged to and/or processed in a mill under a controlled atmosphere.
  • the invention is particularly useful for the processing in a ball mill metal powders which are readily oxidized and are prepared as dispersion strengthened materials or alloys by powder metallurgy routes.
  • the milling of such materials must be carried out in a controlled atmosphere, e.g., in a hermetically sealed or purgative atmosphere, or in an environment of controlled gas flow such as an inert gas, or in an atmosphere of inert gas which contains specific amounts of process controlled agents, e.g. hydrocarbons, alcohols, acids, etc.
  • process controlled agents e.g. hydrocarbons, alcohols, acids, etc.
  • the present invention is especially useful generally, for processing in a mill any materials where a controlled atmosphere is required or beneficial.
  • the present invention can be used advantageously for preparing by a powder metallurgy route dispersion strengthened alloys having, e.g., nickel, titanium, chromium, magnesium, copper, iron or aluminum as a major constituent.
  • Figures 1 and 2 show a diagrammatic view in cross-section of the charging portion 10 of a ball mill comprising a portion of a rotatably mounted, hollow, cylindrical, metal shell 11, having an orifice 12 for the passage of the charge material into the mill, and sealably secured on the shell a loading means 13 for charging powder into the mill while sealed to the atmosphere.
  • the loading means 13 comprises a loading conduit 14 having removable sealing means 15, e.g. a blind flange, and a valve assembly 16.
  • the loading conduit 14 has an entry port 17 and an exit port 18, and it may be fitted with a conduit valve (not shown).
  • the exit port 18 from the loading conduit is aligned with orifice 12, providing a smooth, unencumbered, direct passage for the charge material into the mill.
  • the removable sealing means 15 is used to seal the loading conduit after shell 11 has been charged.
  • Charging receptacle 24, equippped with butterfly valve 25 (alternatively, a slide gate or any other appropriate valve) is connected at the entry port 17 to the loading means 13 by means of bolts 26a and 26b through flanges 28 and 50.
  • the valve assembly 16 of the loading means in turn comprises a valve plug 29 and a sealed valve activating means for opening and closing the valve.
  • the valve plug 19 is designed to fit into sealable relationship with shell 11 so as to form a hermetical seal on the shell with respect to the loading means 13 in the orifice 12 when the valve is in the closed position.
  • the valve activating means is comprised of valve stem 20 flexibly connected at connection means 31 to the valve plug 19 to allow for plug alignment. (Alternative alignment means may be provided).
  • the valve stem 20 permits opening and closing of the valve plug 19 in shell 11 without exposing material in the loading conduit 14 to the air.
  • Loading conduit 14 is adapted with a sealed entry means, viz, valve packing 21, packing nut 21 a, and valve stem guide 20a for the valve stem 20.
  • Valve stem 20 extends outside the seal, providing a means for controlling the opening and closing of the valve from a position outside the sealed portion of the loading means 13 without exposing the interior of the shell to air.
  • Flexible bellows 32 also seal powder out of the valve stem area.
  • valve plug seat having a beveled rim 22
  • valve plug 19 is machined at rim 23 to mate securely with a valve plug seat beveled rim 22 and seal the shell when the valve is in the closed position.
  • rim 23 or seal 22 may be the segment of a sphere or other curve to improve valve seating and alignment.
  • an elastomeric-type material may be used to provide a further seal between the valve plug and the orifice.
  • angle a i.e. the valve stem angle relative to the horizontal when the loading conduit 14 is vertical, is 45°, i.e.
  • valve plug 19 is constructed, for example, of an abrasion resistant material so that it will not be worn away during the grinding cycle of the mill.
  • the valve stem 20 is provided with means 29a and 29b (an orifice and pin, respectively) to hold it in the closed position, and with a means 30, (a stem stop) to limit the travel of the stem in open position.
  • stem 20 could be threaded for valve opening and closing.
  • purge port 27 which is fitted so that a vacuum line and/or purge gas line can be connected to the loading conduit
  • Figure 1 shows schematically the valve plug in the open position with a charging receptacle sealed to the entry port
  • Figure 2 shows the closed position of the valve plug with the blind flange in place.
  • the orifice 12 will be sealed with the valve plug during operation of the mill.
  • the valve seat 22 is vertically aligned with the loading circuit 14 at the lower end of the orifice and horizontal at the upper end. This arrangement provides for flow-through of charge material without encumbrances to the passage of powder into the shell.
  • the mill shell may be, for example, cylindrical, spherical, double or single conical, multi-flat sided, etc.
  • the exact shape of the mill shell is not critical to the invention.
  • Mills may also be double walled (or jacketed) for mill shell cooling. Water or other cooling media may be passed through this space (or jacket).
  • the loading means may be sealably mounted on the outer side of the shell with, e.g. a flange. To obviate the need for alignment of the loading port on the entire shell, the complete loading means assembly including a section of the shell with the orifice can be mounted separately into the shell. This arrangement would also be convenient for repair and replacement of the loading means without otherwise disturbing the mill.
  • FIG 3 shows a preferred embodiment of the present invention in which a pair of loading means 13 and 13a are located on the periphery of rotatably mounted shell 11 of a ball mill 40.
  • the ball mill comprises a pair of support members 33 and 34, a cylindrical shell 11, mounted for rotation about an approximately horizontal axis on trunnion bearings 38 and 38a.
  • the shell comprises ends 35 and 36, a peripheral wall 37 and a pair of charging orifices (concealed in the drawing by the loading means 13 and 13a, respectively).
  • the charging orifices are sealable from the atmosphere, respectively, by the pair of loading means 13 and 13a secured on the shell 11 to cover the respective charging orifices.
  • the grinding medium i.e. the balls, are not shown.
  • the driving means 39 for the mill which is not shown in detail and not a part of the invention.
  • the loading means 13 and 13a are in the essentially vertical position so as to permit charging of the mill under the force of gravity, the loading means 13 and 13a are on the side of the rotary mill shell 11, with a portion of valve stems 20 and 20a visible.
  • Shell 11 is sealed from the air and is provided with a means (not shown) for feeding into or establishing in the shell a desired environment, e.g. nitrogen, argon or other elemental or mixed gas with or without process control additives, e.g. controlled amounts of hydrocarbons or oxygen or carbon.
  • Means to discharge material from the mill is not shown: A suitable means of discharging the mill is disclosed, for example, in EP-0 195 613.
  • the charge materials e.g. metal powders
  • the valve stem 20 While maintaining the loading means under sealed conditions, charging receptacle 24 with valve 25 closed is attached to the loading means, the valve stem 20 is operated to move valve plug 19 into the open position, i.e. extended into the rotary shell, thereby opening the orifice in shell. Valve 25 is then opened, thereby releasing charge material from the receptacle.
  • the powder charge will then flow through the loading conduit into the interior of rotary mill shell.
  • the valve stem 20 is used to retract and secure the valve plug 19 to the shell face.
  • the charge receptacle can then be removed.
  • the loading conduit is maintained sealed to the atmosphere after the charge receptacle is removed.
  • the mill shell is rotated about an essentially horizontal central axis.
  • the charging system is adapted for placement on a mill with the drum operated to rotate about a non-horizontal axis.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Powder Metallurgy (AREA)
  • Crushing And Pulverization Processes (AREA)

Claims (4)

1. Eine Drehmühle für einen Betrieb unter kontrollierten Bedingungen mit
-einem hohlen drehbaren Gehäuse (11),
-einer Antriebsvorrichtung für das Gehäuse (11),
-mindestens einer Füllöffnung (12) im Gehäuse, durch welche Füllmaterial in das Gehäuse eingebracht werden kann,
-einem System (13) zum Einfüllen von Material in das Gehäuse, dadurch gekennzeichnet, daß die Mühle diskontinuierlich betrieben wird und während ihres Stillstandes gefüllt werden kann, wobei das Füllsystem (13) eine Beschickeinrichtung aufweist, welche dichtend am Gehäuse (11) auf die oder jede Füllöffnung (12) aufgesetzt und gegen Luftzutritt abgedichtet werden kann, sowie folgendes enthält:
einen Füllkanal (14), der gegen Luftzutritt abgedichtet werden kann und eine sich vom Gehäuse weg erstreckende Seitenwand, eine Eintrittsöffnung (17) zum Einfüllen von Material in den Einfüllkanal sowie einen Austrittskanal (18) für das Entleeren des Füllmaterials aus dem Füllkanal hat, wobei der Austrittskanal (18) mit der Füllöffnung (12) fluchtet und eine in der Längsrichtung verlaufende Symmetrieachse hat,
eine bewegliche Ventileinheit (16), welche sich durch die Seitenwand des Füllkanals (14) erstreckt und eine Symmetrieachse hat, wobei wenigstens ein Teil der Ventileinheit im Füllkanal angebracht ist und gegen Luftzutritt angedichtet werden kann, und wobei die Ventileinheit einen dichtend auf die Öffnung (12) im Gehäuse (11) passenden Ventilteller (19), eine Ventilöffnungsvorrichtung (20) zum Abheben des Ventiltellers von der Füllöffnung (12) im Gehäuse (11) und eine Ventilschließvorrichtung (20) zum dichtend Anlegen des Ventiltellers (19) an der Füllöffnung (12) im Gehäuse (11) aufweist, wobei die Ventilöffnungs-und -schließvorrichtungen (20) betätigt werden können, während die Beschickeinrichtung gegen Luftzutritt abgedichtet ist, sodaß die Mühle gefüllt werden kann, ohne daß das Füllmaterial der Umgebungsluft ausgesetzt ist, wobei die längs verlaufende Symmetrieachse des Füllkanals (13) mit der Symmetrieachse der Einheit (16) einen Winkel von im wesentlichen 45° einschließt, und wobei die Mühle Vorrichtungen aufweist, mit welchen das Gehäuse in einer derartigen Stellung festgehalten werden kann, daß die Symmetrieachse des Füllkanals während des Einfüllens des genannten Füllmaterials im wesentlichen senkrecht verläuft.
2. Eine Mühle nach Anspruch 1, welche ein abgedichtetes Füllgefäß (24) aufweist, das von der Fülleinrichtung (13) abgenommen werden kann.
3. Eine Mühle nach Anspruch 1 oder 2, in welcher die Ventileinheit (16) einen mit dem Ventilteller (19) nachgiebig verbundenen Ventilschaft (20) aufweist.
4. Eine Mühle nach einem der Ansprüche 1 bis 3, in welcher die Öffnung (12) einen abgeschrägten Rand (22) aufweist, gegen welche sich der Rand (23) des Ventiltellers parallel zur Symmetrieachse des Einfüllkanals (13) verläuft.
EP86301864A 1985-03-15 1986-03-14 Rotierende Mühle mit Ladungssystem Expired - Lifetime EP0195614B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86301864T ATE55281T1 (de) 1985-03-15 1986-03-14 Rotierende muehle mit ladungssystem.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US71270285A 1985-03-15 1985-03-15
US712702 1991-06-10

Publications (3)

Publication Number Publication Date
EP0195614A2 EP0195614A2 (de) 1986-09-24
EP0195614A3 EP0195614A3 (en) 1987-08-05
EP0195614B1 true EP0195614B1 (de) 1990-08-08

Family

ID=24863191

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86301864A Expired - Lifetime EP0195614B1 (de) 1985-03-15 1986-03-14 Rotierende Mühle mit Ladungssystem

Country Status (5)

Country Link
EP (1) EP0195614B1 (de)
JP (1) JPS61213302A (de)
AT (1) ATE55281T1 (de)
CA (1) CA1259066A (de)
DE (1) DE3673195D1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0651128B2 (ja) * 1987-05-21 1994-07-06 動力炉・核燃料開発事業団 粉末粉砕・混合機における粉末取り出し機構
CA2352406A1 (fr) * 2001-07-04 2003-01-04 Robert Schulz Valve pour la decharge des poudres d'un broyeur a haute energie
EP2698203B1 (de) * 2012-08-13 2015-11-18 Sandvik Intellectual Property AB Fülltrichter
US10370129B2 (en) * 2015-08-17 2019-08-06 Dash Llc Assemblies including plug devices, and related plug devices and methods
CN113399055B (zh) * 2021-06-01 2024-04-02 合肥皖燃新材料科技有限公司 氢氧化铝阻燃剂加工用浆料碾磨装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2122399A (en) * 1934-01-11 1938-07-05 Paul O Abbe Inc Ball and pebble mill
DE843090C (de) * 1948-10-02 1952-07-03 Metallgesellschaft Ag Verfahren und Vorrichtung zum Beschicken von Behaeltern, die unter hoeherem Druck stehen
BE785949A (fr) * 1971-07-06 1973-01-08 Int Nickel Ltd Poudres metalliques composees et leur production
US4054292A (en) * 1976-12-16 1977-10-18 Union Carbide Corporation Gas seal for rotating grinding mill having peripheral discharge
DE2845980B2 (de) * 1978-10-21 1981-05-07 Klöckner-Humboldt-Deutz AG, 5000 Köln Verfahren und Vorrichtung zur Inertisierung eines brennbares Gut enthaltenden Anlagensystemes
AT381871B (de) * 1981-11-26 1986-12-10 Voest Alpine Ag Einrichtung zum verschliessen einer beschickungsoeffnung fuer autoklaven

Also Published As

Publication number Publication date
ATE55281T1 (de) 1990-08-15
EP0195614A3 (en) 1987-08-05
CA1259066A (en) 1989-09-05
DE3673195D1 (de) 1990-09-13
JPS61213302A (ja) 1986-09-22
EP0195614A2 (de) 1986-09-24

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