US3184168A - Apparatus for pneumatically grinding divided substances - Google Patents

Apparatus for pneumatically grinding divided substances Download PDF

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Publication number
US3184168A
US3184168A US230826A US23082662A US3184168A US 3184168 A US3184168 A US 3184168A US 230826 A US230826 A US 230826A US 23082662 A US23082662 A US 23082662A US 3184168 A US3184168 A US 3184168A
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US
United States
Prior art keywords
grinding
covers
synthetic material
pneumatically
chamber
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
US230826A
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English (en)
Inventor
Feld Erich
Kleinlein Werner
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.)
Hoechst AG
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Hoechst AG
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 Hoechst AG filed Critical Hoechst AG
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Publication of US3184168A publication Critical patent/US3184168A/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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/06—Jet mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/06—Jet mills
    • B02C19/061—Jet mills of the cylindrical type

Definitions

  • the present invention provides an apparatus for pneumatically grinding divided substances, for example granular, gritty or coarsely powdered dry substances, in a grinding apparatus with the help of grinding air.
  • the apparatus of the invention is particularly applicable to pharmaceutic products and organic or inorganic dyestuli pigments.
  • dust particles are prevented from depositing on the Walls of the passage of flow within the grinding apparatus, thereby avoiding obstruction of the grinding apparatus which would require the latter to be stopped after a short Working time, for example a few minutes, in order to be cleaned.
  • the apparatus of the invention thus has the advantage of permitting continuous working.
  • the apparatus of the present invention is constructed in the manner wherein the inner sides of the covers of the mill case, that is those surfaces of the covers which face the grinding space, are provided with coverings of elastic synthetic material which are secured along their edges to the covers so that a hollow space is formed between the elastic synthetic material and the covers.
  • the apparatus of the invention furthermore comprises members for introducing compressed air into the hollow space and discharging it therefrom so that the coverings of synthetic material are kept in rhythmical motion. The compressed air is introduced and discharged through these members with the help of a periodic control member.
  • the hollow space is subdivided into several cells of the same or different dimensions, all of which or part of which may be connected one to the other by channels.
  • the covering of synthetic material is fastened to the covers in several places, for example, by adhesive.
  • the apparatus of the invention may also be constructed in a manner such that the inner sides of the covers are provided with flat bodies of elastic synthetic material which contain hollow spaces.
  • the individual hollow spaces may be of different dimensions and may all or in part be connected to one another by channels.
  • short feed pipe 4 the material to be ground enters the discharge range of the nozzles and is ground in that range while being continuously rotated until a desired fineness of grinding has been obtained.
  • the said introduction of the material to be ground is realized with the help of a small amount of conveying air which under the conditions prevailing in the present case amounts to about cubic meters per hour (measured at N.T.P.).
  • the feed pipe is tilted in the direction of rotation (in a plane perpendicular to the plane of the drawing).
  • the stream of air finally travels in a spiral line to the upper end of short discharge pipe 4a.
  • the apparatus of the invention has the effect of a wind sitter. Only the finely ground material is entrained and discharged from the grinding apparatus through short discharge pipe 4a. The discharged finely ground material is subsequently freed from the conveying air and bunkered or filled in containers.
  • the mill case is closed by covers 5 and 6, respectively, screwed to ring channel 2.
  • the lower side of cover 5 and the upper side of cover 6 are provided each with sheets 7 and 8, respectively, made of soft elastic synthetic material. Sheets 7 and 8 may be fastened to the covers, for example, by adhesive. They are provided with channels 9 which are disposed in the form of rings around the axis of the mill and are all connected one to the other by individual small channels 19. Compressed air is introduced at 11 and 12., respectively, through pipe connections. The compressed air is supplied and discharged through these pipe connections with the help of a periodic control member in a manner such that the pressure in the channels rises from 0 to 3 atmospheres gage and drops again to 0.
  • rhythm at the upper cover and the rhythm at the lower cover be synchronous. In this manner, continuous breathing of the inner sides of the mill is obtained. Breathing is most pronounced in the range of the large ring channels and takes place, for example, 3 times a minute.
  • the wall thicknesses and channel widths of the covering of synthetic material may vary to obtain different effects in different places of the mill.
  • An apparatus for pneumatically grinding divided substances comprising a grinding apparatus having a grinding chamber and means to inject a grinding fluid under pressure around the periphery of said grinding chamber, wherein the covers of the grinding chamber are provided, at the sides which face the grinding chamber, with coverings of elastic synthetic material which are secured along their edges to the covers so that a hollow space is formed between the elastic synthetic material and the covers, and members are disposed for introducing compressed air into the hollow space and discharging it therefrom to produce a rhythmical motion of the coverings of synthetic material.
  • hollow spaces are of ditferent dimensions, at least two hollow spaces being connected one to the other by channels.
  • Apparatus for pneumatically grinding divided substances comprising a grinding chamber with top and bottom covers, means for injecting a grinding fluid under pressure around the periphery of said chamber, means for introducing material to be ground to said chamber, means for removing ground material from said chamber, a lining of an elastic synthetic material on the surfaces of said covers facing said chamber, said lining forming at least one space between the chamber and the cover, and means for introducing a compressed fluid into said space and discharging it therefrom to produce rhythmical motion in said lining.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)
US230826A 1961-10-20 1962-10-16 Apparatus for pneumatically grinding divided substances Expired - Lifetime US3184168A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF35171A DE1196945B (de) 1961-10-20 1961-10-20 Strahlmuehle mit Mahlkammer aus elastischen Waenden

Publications (1)

Publication Number Publication Date
US3184168A true US3184168A (en) 1965-05-18

Family

ID=7095888

Family Applications (1)

Application Number Title Priority Date Filing Date
US230826A Expired - Lifetime US3184168A (en) 1961-10-20 1962-10-16 Apparatus for pneumatically grinding divided substances

Country Status (6)

Country Link
US (1) US3184168A (fr)
BE (1) BE623894A (fr)
DE (1) DE1196945B (fr)
FR (1) FR1336564A (fr)
GB (1) GB1014759A (fr)
NL (1) NL284077A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3315900A (en) * 1964-05-13 1967-04-25 British Titan Products Apparatus for pulverizing
US3514043A (en) * 1967-08-04 1970-05-26 Nat Lead Co Fluid energy mill for milling friable materials
US3710666A (en) * 1970-11-23 1973-01-16 Dayton Progress Corp Die assemblies
US5004488A (en) * 1989-03-20 1991-04-02 Pitman-Moore, Inc. Process for producing high purity fused quartz powder
US20080108137A1 (en) * 2006-10-11 2008-05-08 Guillaume Rigaut Dispersion Devices For Aggregates

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2262896B (en) * 1991-10-18 1995-03-22 Gravesend Engineering Company Apparatus for pulverising solid materials
DE102006048865A1 (de) * 2006-10-16 2008-04-17 Roland Dr. Nied Verfahren zur Erzeugung feinster Partikel und Strahlmühle dafür sowie Windsichter und Betriebsverfahren davon
DE102007054071B4 (de) 2007-11-13 2010-06-10 Eisfink Max Maier Gmbh & Co. Kg Verbundmetallgegenstand und Verfahren zur Herstellung eines Verbundmetallgegenstands

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2352327A (en) * 1942-03-07 1944-06-27 Quaker Oats Co Grain huller
US2588945A (en) * 1948-06-29 1952-03-11 Micronizer Company Means inhibiting escape of oversize particles from circulatory pulverizing mills
US2983453A (en) * 1958-03-13 1961-05-09 Socony Mobil Oil Co Inc Method of pulverization
US3062459A (en) * 1959-01-08 1962-11-06 Arthur G Dearing Two stage centrifugal impact pulverizing apparatus with annular elastomeric concaves

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2339568A (en) * 1941-04-16 1944-01-18 Internat Pulverizing Corp Grinding and classifying apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2352327A (en) * 1942-03-07 1944-06-27 Quaker Oats Co Grain huller
US2588945A (en) * 1948-06-29 1952-03-11 Micronizer Company Means inhibiting escape of oversize particles from circulatory pulverizing mills
US2983453A (en) * 1958-03-13 1961-05-09 Socony Mobil Oil Co Inc Method of pulverization
US3062459A (en) * 1959-01-08 1962-11-06 Arthur G Dearing Two stage centrifugal impact pulverizing apparatus with annular elastomeric concaves

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3315900A (en) * 1964-05-13 1967-04-25 British Titan Products Apparatus for pulverizing
US3514043A (en) * 1967-08-04 1970-05-26 Nat Lead Co Fluid energy mill for milling friable materials
US3710666A (en) * 1970-11-23 1973-01-16 Dayton Progress Corp Die assemblies
US5004488A (en) * 1989-03-20 1991-04-02 Pitman-Moore, Inc. Process for producing high purity fused quartz powder
US20080108137A1 (en) * 2006-10-11 2008-05-08 Guillaume Rigaut Dispersion Devices For Aggregates
WO2008067044A3 (fr) * 2006-10-11 2008-12-04 Merial Ltd Dispositifs de dispersion pour agrégats
US7658341B2 (en) 2006-10-11 2010-02-09 Merial Limited Dispersion devices for aggregates

Also Published As

Publication number Publication date
NL284077A (fr)
DE1196945B (de) 1965-07-15
BE623894A (fr)
GB1014759A (en) 1965-12-31
FR1336564A (fr) 1963-08-30

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