US3601322A - Fine grinding apparatus - Google Patents

Fine grinding apparatus Download PDF

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Publication number
US3601322A
US3601322A US745150A US3601322DA US3601322A US 3601322 A US3601322 A US 3601322A US 745150 A US745150 A US 745150A US 3601322D A US3601322D A US 3601322DA US 3601322 A US3601322 A US 3601322A
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United States
Prior art keywords
shaft
agitator
equipment
arms
members
Prior art date
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Expired - Lifetime
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US745150A
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English (en)
Inventor
Andrew Szegvari
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UNION PROCESS INTERNATIONAL Inc AN OH CORP
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Individual
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Publication of US3601322A publication Critical patent/US3601322A/en
Assigned to UNION PROCESS INTERNATIONAL, INC. AN OH CORP. reassignment UNION PROCESS INTERNATIONAL, INC. AN OH CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ARNO, SZEGVARI, ADMINISTRATOR, DBN/WWA OF THE ESTATE OF ANDREW SZEGVARI, DEC`D
Assigned to SZEGVARI, ARNO ADMINISTRATOR DE BONIS NON OF THE ESTATE OF ANDREW SZEGVARI, DEC'D. reassignment SZEGVARI, ARNO ADMINISTRATOR DE BONIS NON OF THE ESTATE OF ANDREW SZEGVARI, DEC'D. LETTERS OF ADMINISTRATION (SEE DOCUMENT FOR DETAILS). EFFECTIVE MARCH 27, 1981. Assignors: SZEGVARI, ANDREW, DEC'D.
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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
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B02C17/163—Stirring means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/19—Stirrers with two or more mixing elements mounted in sequence on the same axis
    • B01F27/192—Stirrers with two or more mixing elements mounted in sequence on the same axis with dissimilar elements

Definitions

  • the present invention relates to an improved apparatus for grinding and dispersing solid particlescontained'ina liquid medium by means of amass of balls or otherdiscrete elements agitated by means of a rotating agitator within the liquid medium, and to an improved agitator for such apparatus.
  • the invention is particularly concerned with that type of apparatus in which the grinding elements are agitated by an agitator having agitating members which move through the mass of elements to keep the elements in random relative motion so that they exert attritive action on material prese'nt in said mass of agitated media, as is described in U.S. Pat. No.- 2,784,359 or with a continuous process such asfor example, is described and claimed in U.S. Pat. No. 3,149,789.
  • the grinding apparatus of this invention is sharply distinguished from apparatus where grinding media such as Ottawa sand is thrown outwards against the wall of the grinding vessel by discs on a rotating shaft. n the contrary in the apparatus of this invention the agitator members maintain the grinding elements in kinetically activated condition within the liquid rather than in group' movement and to concentrate the maximum activity away from the wall of the vessel.
  • the agitator members and/or the bafiling means may be constructed to obviate or lessen this tendency.
  • This may be effected in numerous'ways, e.g., by vanes or ribs or other means'constructed and arranged to have an outward force on the material when it has flowed or been induced towards the shaft.
  • the discs may alternatively be freely mounted about the shaft.
  • the agitator members and the discs may be perpendicular to the shaft or arranged inplanes at a suitable oblique inclination thereto.
  • the discs could'be'arranged'to wobble with reference to the shaft.
  • An alternative form of baffling means comprises spiral webs or plates attached to or loosely mounted about the shaft.
  • a mass of small spherical or substantially spherical elements is preferred since in the process of the invention elements of any other shape or of irregular shape are likely to jam and interfere with that random distribution of the momentum of the elements which is aimed at.
  • Balls of a diameter between one sixty-fourth inch and nine-sixteenths inch are found very suitable.
  • Balls of steel or of a'ceramic material having a specific gravity of 2 or more are advantageous, e.g., they may be of a ceramic material such as steatite', aluminum oxide, zirconia or
  • the invention proposes to provide between agitator members, means .for baffling or preventing undesired flow of the liquid material along and immediately around the shaft.
  • the agitator members may be of varied description, e.g., they may be arms extending through the shaft 'or fixed tangentially to .the shaft, and arranged in different angular relationships as seen from the end of the shaft (e.g., with alternate arms .at right angles to the remaining arms) preferably with each arm projecting to a greater extent from the shaft at one end than at the other; they may be eccentrically arranged rings secured to the shaft at respectively different angular positions around the shaft as in U.S. Pat. No. 3,243,128, or of any other form which would permit the flow of the liquid material along and immediately around the shaft in the absence of the baffling means' provided by the present. invention.
  • the baffle members may take the form of discs attached to or integral with the shaft between agitator members, e;g., as is hereinafter more particularly described. There may be a disc 7 to each pair of agitator members.
  • the discs may. be provided with bosses so that in the axial direction they occupy the distance between adjacent agitator members.
  • Further members may be provided for directing the liquid outwards or inwards in relation to the shaft between the agitator members.
  • The. presence of the baffling means may in some cases give rise to a tendency for-a dead space or spaces to be produced projection from the shaft of hafnium'dioxide. Small rounded pebbles will also serve.
  • the speed of rotation of the agitator depends inter alia on the size of the balls.
  • the apparatus may be designed to produce a lifting or depressing action on the media, or alternatively a lift action may be produced in one region, such as the lower region of the chamber and a depressing action at another re-' gion, e.g., the upper region of the chamber.
  • the tendency is for the agitator members to direct the liquid material in a helical path through the vessel and by choosing the direction of rotation lift or depressing action can be layers with larger media at the bottom or inlet end and smaller media at the other end, or layers may be graduated as to the size of the media and provision made for separating the layers.
  • FIG. 1 is a sectional elevation of a continuous grinding and dispersing vessel
  • FIG. 2 is a cross-sectional plan view of the agitator through one of the agitator members
  • FIG. 3 is an enlarged fragmentary view showing two agitator members and their element-activating action and one baffle disc interposed between them;
  • FIG. 4 is a section through a vessel equipped with a baffle and eccentrically positioned rings to serve as agitating members; and i FIG. 5 is a section on line 5-5 of FIG. 4.
  • the continuous means shown comprises a deep cylindrical vessel '1.
  • the inlet 2 will receive the liquid material to be treated, e.g., supplied by a pump, and the material usually flows past a sieve in the top of the vessel through a suitable outlet which may be arranged at the top of the vessel or substantially so, the sieve permitting flow of the treated liquid but holding back the grinding elements, as is known.
  • the vessel is charged with a mass of spherical-grinding elements 3.
  • An agitator 4 is provided in the vessel and comprises a shaft '5 extending axially of the vessel to near the inlet end thereof.
  • the agitator comprises multiple agitator members in the form of radial arms 6, in this-instance of circular section, alternating arms 6a being disposed at right angles to the remainder 6b when viewed from the end of the shaft.
  • Each arm extends further at one side of the shaft than the other and those in each group are in staggered relationship, i.e., alternate arms 6a extend more at one side of the shaft and the remaining arms 6a extend further at the other side of the shaft.
  • the arms in the form illustrated in FIGS. 1 and 2 are arranged tangentially of the shaft alternating in each group from one side to the other of the shaft.
  • each arm may be located in a chordal groove in the shaft and cross-bolted to the shaft by a net 7 and bolt 8.
  • the bolthead may be countersunk as shown.
  • a disc 9 attached to a boss 10 attached to the shaft and forming a baffle member.
  • the disc and boss unit is of a depth corresponding to the spacing between the arms of the pair for facilitating structural strength of the agitator.
  • the action of the discs is to baffle the flow of the liquid medium immediately around and along the shaft. As depicted by the arrows B they deflect the liquid medium outwards, but they are of a diameter less than the length of the arms, so that they do not interfere with the activating action of each end of each arm.
  • the arms in FIG. 3 are formed by rods or bars passing through apertures in the shaft.
  • the speed at which the shaft is rotated depends inter alia upon the size of the spherical elements. With elements of a diameter of one-eighth inch upwards, a suitable speed is 100-150 r.p.m., with elements of a diameter of three thirtyseconds to one-eighth inch a suitable speed is from 300 to 600 rpm. and with elements below three thirty-seconds inch a suitable speed is 400800 r.p.m.
  • F168. 4 and 5 illustrate a vessel with a vertical agitator shaft 14 to which the baffle l5 and eccentric rings l8, l9 and are attached, the latter to serve as agitating members.
  • An agitator for a cylindrical vessel comprising agitating members arranged along and projecting outwardly from a shaft and comprising baffle means for baffling flow of liquid material along and immediately around the shaft, portions of agitating members which extend the greatest distance from the shaft extending a greater distance from the shaft than the portion of the baffle means farthest from the shaft.
  • baffle means are in the form of discs and at least one portion of each agitating member projects outwardly beyond the periphery of the discs.
  • An agitator according to claim 2 in which the discs have bosses so that in the axial direction they occupy the distance between adjacent agitator members.
  • An agitator according to claim 1 in which the agitating members are in the form of arms and adjacent arms extend from the shaft at an angle to one another.
  • agitator member according to claim 1 in which the agitator members are in the form of eccentrically disposed rings with adjacent rings extending in different directions from the shaft.
  • Agitating equipment which comprises a vessel adapted to retain a liquid, and an inlet opening at the bottom of the vessel, the vessel containing a mass of grinding elements and a vertical shaft with agitating members arranged along the shaft and projecting from the shaft with the portions thereof farthest from the shaft spaced from the inner surface of the vessel, and means arranged along the shaft and projecting from it a lesser distance than the agitating members to baffle the flow of liquid along and immediately around the shaft when the shaft is rotated while the vessel contains liquid.
  • each arm is substantially tangential to the shaft.
  • each baffle means is a disc.
  • each agitating member projects outwardly beyond the periphery ofthe discs.
  • each disc is attached to the shaft by a boss, the disc and boss are situated immediately between two arms, and said two arms are at to one another.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
US745150A 1967-07-17 1968-07-16 Fine grinding apparatus Expired - Lifetime US3601322A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB32770/67A GB1197583A (en) 1967-07-17 1967-07-17 Method of and Apparatus for Grinding Solid Particles

Publications (1)

Publication Number Publication Date
US3601322A true US3601322A (en) 1971-08-24

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ID=10343741

Family Applications (1)

Application Number Title Priority Date Filing Date
US745150A Expired - Lifetime US3601322A (en) 1967-07-17 1968-07-16 Fine grinding apparatus

Country Status (5)

Country Link
US (1) US3601322A (de)
CH (1) CH487674A (de)
DE (1) DE1782066C3 (de)
GB (1) GB1197583A (de)
NL (1) NL6810095A (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1980000925A1 (en) * 1978-10-31 1980-05-15 Union Process International An agitated-media mill with a baffled inner wall
US4979686A (en) * 1989-10-03 1990-12-25 Union Process, Inc. High speed dry grinder
US5080293A (en) * 1990-10-15 1992-01-14 Union Process, Inc. Continuous wet grinding system
US5199656A (en) * 1990-10-15 1993-04-06 Union Process, Inc. Continuous wet grinding system
EP0686428A1 (de) 1994-06-10 1995-12-13 Eastman Kodak Company Mikromühle mit Zerkleinerungsmitteln und Verfahren zu ihrer Verwendung
US5662279A (en) * 1995-12-05 1997-09-02 Eastman Kodak Company Process for milling and media separation
US5967430A (en) * 1995-09-09 1999-10-19 Hermann Getzmann Dispersing device and process
US20080208234A1 (en) * 2005-09-16 2008-08-28 Prionics Ag Apparatus for Cutting Up Biological Sample Material
EP2199086A1 (de) * 2008-12-19 2010-06-23 Kba-Metronic Ag Tintentank

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2629251C2 (de) * 1976-06-30 1987-03-19 Draiswerke Gmbh, 6800 Mannheim Rührwerksmühle
CN112792997B (zh) * 2021-03-29 2021-07-02 烟台鑫隆建材有限公司 一种用于高导热硅砖生产的混合装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US677702A (en) * 1897-08-20 1901-07-02 William M Russell Pulverizing-mill.
US3432109A (en) * 1964-01-18 1969-03-11 Netzsch Mas Fab Geb Machine for dispersing and comminuting flowable materials
US3458144A (en) * 1967-04-17 1969-07-29 Mobil Oil Corp Attritor mill

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US677702A (en) * 1897-08-20 1901-07-02 William M Russell Pulverizing-mill.
US3432109A (en) * 1964-01-18 1969-03-11 Netzsch Mas Fab Geb Machine for dispersing and comminuting flowable materials
US3458144A (en) * 1967-04-17 1969-07-29 Mobil Oil Corp Attritor mill

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1980000925A1 (en) * 1978-10-31 1980-05-15 Union Process International An agitated-media mill with a baffled inner wall
US4244531A (en) * 1978-10-31 1981-01-13 Union Process, Inc. Agitated-media mill with a baffled inner wall
US4979686A (en) * 1989-10-03 1990-12-25 Union Process, Inc. High speed dry grinder
US5080293A (en) * 1990-10-15 1992-01-14 Union Process, Inc. Continuous wet grinding system
US5199656A (en) * 1990-10-15 1993-04-06 Union Process, Inc. Continuous wet grinding system
EP0686428A1 (de) 1994-06-10 1995-12-13 Eastman Kodak Company Mikromühle mit Zerkleinerungsmitteln und Verfahren zu ihrer Verwendung
US5593097A (en) * 1994-06-10 1997-01-14 Eastman Kodak Company Micro media mill and method of its use
US5967430A (en) * 1995-09-09 1999-10-19 Hermann Getzmann Dispersing device and process
US5662279A (en) * 1995-12-05 1997-09-02 Eastman Kodak Company Process for milling and media separation
US20080208234A1 (en) * 2005-09-16 2008-08-28 Prionics Ag Apparatus for Cutting Up Biological Sample Material
US7980500B2 (en) * 2005-09-16 2011-07-19 Prionics Ag Apparatus for cutting up biological sample material
EP2199086A1 (de) * 2008-12-19 2010-06-23 Kba-Metronic Ag Tintentank

Also Published As

Publication number Publication date
DE1782066A1 (de) 1972-08-03
NL6810095A (de) 1969-01-21
DE1782066B2 (de) 1974-04-18
CH487674A (de) 1970-03-31
GB1197583A (en) 1970-07-08
DE1782066C3 (de) 1974-11-14

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Legal Events

Date Code Title Description
AS Assignment

Owner name: UNION PROCESS INTERNATIONAL, INC. 1925 AKRON-PENIN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ARNO, SZEGVARI, ADMINISTRATOR, DBN/WWA OF THE ESTATE OF ANDREW SZEGVARI, DEC`D;REEL/FRAME:004303/0006

Effective date: 19840306

AS Assignment

Owner name: SZEGVARI, ARNO ADMINISTRATOR DE BONIS NON OF THE E

Free format text: LETTERS OF ADMINISTRATION;ASSIGNOR:SZEGVARI, ANDREW, DEC D.;REEL/FRAME:004300/0101

Effective date: 19840628