US3567141A - Mill for grinding hard materials - Google Patents

Mill for grinding hard materials Download PDF

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Publication number
US3567141A
US3567141A US746536A US3567141DA US3567141A US 3567141 A US3567141 A US 3567141A US 746536 A US746536 A US 746536A US 3567141D A US3567141D A US 3567141DA US 3567141 A US3567141 A US 3567141A
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US
United States
Prior art keywords
mill
housing
lining
rotating
feed
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
US746536A
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English (en)
Inventor
Olbracht Sylveste Zbraniborski
Henryk Zielinski
Helmut Kilian Skiba
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.)
INSTYTUT CHEMICZNEJ PREZEROBKI
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INSTYTUT CHEMICZNEJ PREZEROBKI
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Filing date
Publication date
Priority claimed from PL121870A external-priority patent/PL59626B1/pl
Application filed by INSTYTUT CHEMICZNEJ PREZEROBKI filed Critical INSTYTUT CHEMICZNEJ PREZEROBKI
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Publication of US3567141A publication Critical patent/US3567141A/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
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
    • B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
    • B02C13/1807—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate
    • B02C13/1835—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate by means of beater or impeller elements fixed in between an upper and lower rotor disc
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
    • B23K9/124—Circuits or methods for feeding welding wire
    • B23K9/125—Feeding of electrodes

Definitions

  • the jet mills in which the grinding is done by compressed air directing two streams of material counter currently at high speeds and causing the impact of these streams, are characterized by very high power consumption and they need the application of dust collectors for catching the disintegration product from the stream of air by expensive dust separators, because the air circulation is not closed.
  • the purpose of this invention is the elimination of these deficiencies in the above-described constructions by avoiding large impact forces on the classifying element (a screen) so that a high grade of disintegration can be obtained, and the application of pneumatic circulation which assures the controlled disintegration of material, without the need of .dust separators for catching of product.
  • the main advantage of the present invention mill with pneumatic circulation is based on the fact that the device performs two operations simultaneously ie the disintegration and classification of grain sizes with recirculation ofoversize grains for repeated disintegration.
  • the essential fact is that the classifying part of the apparatus is located outside of the region of large impact forces, so it can be made of relatively thin sheet, in which correspondingly small perforations can be made, which enable the production of a finely ground product.
  • the product with grain sizes below 0.3 mm. can beobtained from the feed lumps of e.g. 80-100 mm. during one operation, which is impossible in the case of impact mills of other types, in which the classifying element is a screen, or a grate.
  • the elements in these mills are exposed to the action of large impact forces and therefore they must be made of thick material which excludes having fine perforation.
  • the second advantage of the present invention mill derives from the fact that after every impact of material, it is classified by elimination of fine grains from the circulation which thereby prevents the further unnecessary disintegration of material already ground and saves a great deal of power input.
  • the angle of impact against the casing is highly advantageous. This angle for a proper shape of the armored lining of casing is 90. It is the optimal angle, called the head stroke angle, at which the energy-losses from nonproductive impacting of the material, not causing its disintegration, are the smallest.
  • the present invention mill with pneumatic circulation makes possible socalled petrographic grinding, which is important for the enrichment of ores.
  • the weight of the apparatus in comparison with other devices for similar use is very small.
  • FIG. 1 represents a section of the mill taken along its vertical axis
  • FIG. 2 a section along the line A-on FIG. ll;
  • FIG. 3 a section along the line B-B on FIG. 1;
  • FIG. 4 an axial section of another embodiment of the mill
  • FIG. 5 a section along the line C-C on FIG. 4;
  • FIG. 6 an axial section of a further embodiment of the mill
  • FIG. 7 atop view of the mill of FIG. 6;
  • FIG. 8 an axial section of yet another embodiment of the mill.
  • the present invention mill comprises the crushing chamber 1 formed by the cylindrical casing 2 having interior thereof an armored toothed lining 3, in the lower part thereof the conical element 4 closed by the imperforate bottom 5, above which is the oblique wall 6 which is in the form of a screen or grate.
  • the upper part of chamber 1 is covered by the lid 7.
  • rotating element 13 Inside the chamber 1 rotating element 13 is located having two or more hollow arms'of rectangular cross section, with the passage 14 in the middle.
  • the element 13 is fixed to the shaft 15 which is supported in bearings in the lid 7 and is driven by a motor 16.
  • the funnel 4 is within a conical housing 10, providing the chamber 11 inside, which collects the ground material. The material can be discharged at any time through the outlet lock 12.
  • the vertical duct 17 is held by supports 19 in the crushing chamber 1, with the upper end thereof in the central hole 18 of the rotating elements 13, and with thelower end having a sliding telescopic part 20.
  • the lid 7 is provided with the feed funnel 8 with thelock 9.
  • the above-described device works in the following way.
  • the feed is introduced to the mill in the direction of the arrow a, through the lock 9 and the feed funnel 8 to the rotating element 13, which throws the thus fed material against the cylindrical casing 2 provided with the toothed lining 3.
  • the thus roughly ground material flows down with a spiral movement .onto the screening walls 6 of the conical funnel 4.
  • the ground up feed fraction drops through the screening walls 6 to the collecting chamber 11 from whence it can be taken as processed material, through the lock 12.
  • the remaining imperfectly ground fraction of the feed drops down to the bottom 5 and then it is sucked up by the duct 17, in the direction of the arrows b flowing through the passages 14 of the elements 13 and thrown by centrifugal force against the tooth lining 3 where the feed material is ground further.
  • the described cycle repeats, until by the disintegration of all the grains they fall through the screen 6 to the chamber 11.
  • the inner circulation of the coarse grains of the feed material along the duct 17 and the passages 14 of the arms of element 13 is caused by the rotational movement of the said element 13 which functions as a fan or a pump to suck air in from below, directing it in the inner closed circulation path marked by arrows b on FIG. 1, taking up the grains on the walls 6 or at the bottom 5, of the conical funnel 4. Only the finest grains are not circulated with the air since they drop down through the walls 6 of the screen, to the collecting chamber 1 1.
  • the feed can be charged directly through the feeding funnel 211, to the circulating duct 17 or to the bottom 5, from above through the lock 9, instead of onto the rotating element 13, in order to avoid preliminary crushing.
  • the rotating element 13 consists of two discs 22 and 23 between which the radially extending blades 24 are fastened.
  • the disc 22 is continuous and the lower disc 23 has the hole 18 to which the end of the circulating duct 17 is connected.
  • FIG. 6 and FIG. 7 show the mill with the same pneumatic grain circulation of the feed, the structure of which is based on the circulating duct 17 connected tangentially to the cylindrical casing 2.
  • the screening wall 6 is placed directly in the circulating duct 17, at the bottom 25 of the easing 2 or in the side parts 26.
  • the motor 16 is located below the casing 2 and the lock 9 and the feeding funnel 8 are above it, delivering the feed onto the rotating element 13.
  • the collecting chamber 11 and the lock 12 are located under the duct 17 or the bottom 25 of the casing 2.
  • FIG. 8 A further embodiment of the invention mill is shown in FIG. 8 wherein the circulating 17 is connected at one end to the conical funnel l and at its upper end with the lid 7 of the casing 2, the circulation of the flow of air caused by the rotating element 13 being in the direction of the arrows b shown on FIG. 8.
  • the electrical motor 16 is installed at the side of the casing 2 and puts the element 13 in rotating movement, through the gearbox 27.
  • the lower disc 23 of the element 13 is continuous, and the upper disc 22 has a hole in the middle, connecting the circulating duct 17 by the stub pipe 28 with the pressure space between the discs 22 and 23.
  • the feed is charged by the funnel 8 through the upper section of the duct 17 and the stub pipe 28 to the pressing area of the rotating element 13.
  • the circulating duct 17 is provided with a screen or grate 29 for disposing of the ground grains.
  • the described mill works on a similar principal to the mill shown of FIG. 1--3.
  • the feed is introduced by the funnel 8 to the rotating element 13, which by its blades 24 and centrifugal force, throws it onto the toothed lining 3.
  • the grains crushed coarsely drop down and by the pressure of air go through circulating duct 17 and back to the rotating element 13 and the cycle of grinding repeats.
  • a mill for grinding hard material comprising:
  • a housing lining means in said housing for disintegrating material thrown thereagainst;
  • said means for introducing material comprising feed means for discharging material into the path of said rotating means, said rotating means comprising hollow arms, whereby material fed into said housing is impelled by said arms against said lining means.
  • said means for introducing material comprising feed means for discharging material beneath said rotating means.
  • said means for collecting material comprising a conical housing beneath said conical element.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Crushing And Grinding (AREA)
  • Combined Means For Separation Of Solids (AREA)
US746536A 1967-07-25 1968-07-22 Mill for grinding hard materials Expired - Lifetime US3567141A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL121870A PL59626B1 (xx) 1967-07-25

Publications (1)

Publication Number Publication Date
US3567141A true US3567141A (en) 1971-03-02

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ID=19949709

Family Applications (1)

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US746536A Expired - Lifetime US3567141A (en) 1967-07-25 1968-07-22 Mill for grinding hard materials

Country Status (5)

Country Link
US (1) US3567141A (xx)
BE (1) BE718572A (xx)
DE (1) DE1782130B1 (xx)
FR (1) FR1581116A (xx)
GB (1) GB1234971A (xx)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4165586A (en) * 1978-03-16 1979-08-28 Fricke Roy A Spark plug cleaner and method
US4179075A (en) * 1976-11-23 1979-12-18 Creusot-Loire Vacuum-spraying grinder
US4202141A (en) * 1978-11-08 1980-05-13 Fricke Roy A Two way spark plug cleaner and method
US4242844A (en) * 1979-03-09 1981-01-06 Orion Industries, Inc. Spark plug cleaner with improved grit recycling
US4627579A (en) * 1983-08-05 1986-12-09 Advanced Energy Dynamics, Inc. Particle charging and collecting system
US4921173A (en) * 1985-09-17 1990-05-01 Bartley Bryan A Methods of mineral breaking and apparatus used therefor
US5392997A (en) * 1993-12-08 1995-02-28 Comensoli; Inaco Non-impact pulverizer and method of using
US6039277A (en) * 1998-11-06 2000-03-21 Hamm; Robert L. Pulverizer
US20130081302A1 (en) * 2004-01-16 2013-04-04 Advanced Grinding Technologies Pty Ltd Processing apparatus and methods

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2150043B (en) * 1983-11-25 1987-08-26 Vnii Elek Selskogo Khozyaistva Apparatus for crushing loose granular materials
US5096128A (en) * 1991-02-19 1992-03-17 Chang Wu Shun Grinding device for medical waste
DE4242651A1 (de) * 1992-11-25 1993-12-09 O & K Anlagen Und Systeme Gmbh Einrichtung zum Zerkleinern schüttgutartiger Materialien
US5330113A (en) * 1993-03-29 1994-07-19 Quadro Engineering Inc. Underdriven size reduction machine
CN111495488B (zh) * 2020-04-29 2021-07-23 拜城县峰峰煤焦化有限公司 一种新型环保煤粉加工研磨设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US994596A (en) * 1907-12-17 1911-06-06 Marks Pulverizing Mining And Milling Machinery Co Centrifugal impact pulverizing apparatus.
US2919864A (en) * 1956-12-27 1960-01-05 Benjamin J Parmele Centrifugal pulverizer
US2981489A (en) * 1960-02-15 1961-04-25 Jr William B Hannum Reduction apparatus
US3015391A (en) * 1960-02-24 1962-01-02 Sharples Corp Classification process and apparatus
US3189287A (en) * 1964-03-02 1965-06-15 Jonas J Byberg Feed grinder

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US990633A (en) * 1910-10-20 1911-04-25 Alfred Godfrey Campbell Rock-pulverizing machine.
US3162382A (en) * 1962-03-22 1964-12-22 Bath Iron Works Corp Centrifugal pulverizer
US3155326A (en) * 1962-04-16 1964-11-03 Richard E Rhodes Ore pulverizer and sizing device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US994596A (en) * 1907-12-17 1911-06-06 Marks Pulverizing Mining And Milling Machinery Co Centrifugal impact pulverizing apparatus.
US2919864A (en) * 1956-12-27 1960-01-05 Benjamin J Parmele Centrifugal pulverizer
US2981489A (en) * 1960-02-15 1961-04-25 Jr William B Hannum Reduction apparatus
US3015391A (en) * 1960-02-24 1962-01-02 Sharples Corp Classification process and apparatus
US3189287A (en) * 1964-03-02 1965-06-15 Jonas J Byberg Feed grinder

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4179075A (en) * 1976-11-23 1979-12-18 Creusot-Loire Vacuum-spraying grinder
US4165586A (en) * 1978-03-16 1979-08-28 Fricke Roy A Spark plug cleaner and method
US4202141A (en) * 1978-11-08 1980-05-13 Fricke Roy A Two way spark plug cleaner and method
US4242844A (en) * 1979-03-09 1981-01-06 Orion Industries, Inc. Spark plug cleaner with improved grit recycling
US4627579A (en) * 1983-08-05 1986-12-09 Advanced Energy Dynamics, Inc. Particle charging and collecting system
US4921173A (en) * 1985-09-17 1990-05-01 Bartley Bryan A Methods of mineral breaking and apparatus used therefor
US5392997A (en) * 1993-12-08 1995-02-28 Comensoli; Inaco Non-impact pulverizer and method of using
US6039277A (en) * 1998-11-06 2000-03-21 Hamm; Robert L. Pulverizer
US20130081302A1 (en) * 2004-01-16 2013-04-04 Advanced Grinding Technologies Pty Ltd Processing apparatus and methods
US8844847B2 (en) * 2004-01-16 2014-09-30 Advanced Grinding Technologies Pty Ltd Processing apparatus and methods

Also Published As

Publication number Publication date
BE718572A (xx) 1968-12-31
DE1782130B1 (de) 1971-11-25
FR1581116A (xx) 1969-09-12
GB1234971A (en) 1971-06-09

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