US1709848A - Dust classifier - Google Patents

Dust classifier Download PDF

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Publication number
US1709848A
US1709848A US53174A US5317425A US1709848A US 1709848 A US1709848 A US 1709848A US 53174 A US53174 A US 53174A US 5317425 A US5317425 A US 5317425A US 1709848 A US1709848 A US 1709848A
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United States
Prior art keywords
cone
air
fluid
deflectors
casing
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
US53174A
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English (en)
Inventor
Hardinge Harlowe
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.)
Hardinge Inc
Original Assignee
Hardinge 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 Hardinge Inc filed Critical Hardinge Inc
Priority to US53174A priority Critical patent/US1709848A/en
Priority to GB32573/26A priority patent/GB263820A/en
Priority to GB2279/26A priority patent/GB257568A/en
Priority to DEH109717D priority patent/DE478298C/de
Priority to DEH105262D priority patent/DE470613C/de
Priority to US243824A priority patent/US1721594A/en
Application granted granted Critical
Publication of US1709848A publication Critical patent/US1709848A/en
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
    • B02C21/00—Disintegrating plant with or without drying of the material
    • 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
    • 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
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B07B7/086—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by the winding course of the gas stream

Definitions

  • This invention relates to classifiers such as are used in the classification and the extraction of coarse material and fine material from a body of material laden air or other buoyant or elastic fluid capable of carrying .particles ,in suspension.
  • classifiers of the air current and cone-shaped variety and other varieties of two compartment classifiers have been used, but these have been of such inflexible design that a very narrow range of adjustment was possible and the result was that the classifier designed for the classification of a particular material was at its best efficiency when a certain grade of powderof that material was being produced. It is among 'my purposes of invention to be able to use an apparatus of the cone-shaped variety or of any other variety having two compartments for classifying ditferentsubstances and different grades of the same substance efliciently, and to obtain this result by making the various parts relatively adjustable so as to create the best condition for the different classifications. 1
  • Another object resides in-providing a gen eral assembly comprising a dust classifier susceptible to being adjusted for the separation of dust of Various degrees of fineness, together with a disintegrating mill which serves the purpose of pulverizing coarse material, a cyclone or dust collector for the purpose of collecting the product/ of separation in the form of dust, and connections therebetween including a blower to maintain a dust carrying fluid in circulation throughout the entire assembly and dampers and valves to aid in the proper distribution and necessary regulation of the pressure of the moving mass of dust carrying fluid throughout the assembly.
  • Another object of the invention resides in the provisionof a two-cone separator capabl of relative adjustment for varying the lifting capacity of theair passing between the cones.
  • Another object resides in the design of defleeting blades such as will cause various degrees of fineness of material to be'separated out from the current of material laden air ticular area of the surfaces of the blades that arerendered efi'ective. by being exposed to the passing current of materlal laden air.
  • Another object is the provision of a valveless return passagei o. reconvey. oversize r nafrom the detailed description and drawings, in which, I
  • Fig. 1 is a general view showing the operainvention which :will be fully understood tive relation of the classifier with a rotating mill.
  • Fig. 2 is a sectional view of the classifier.
  • Fig.3 is a perspective view of the top of the classifier looking from the inside and clearly showing a design of the deflector blades according to one modification.
  • 1 Fig. 4 is a diagrammatic illustration of another modification of the arrangement of the deflector blades.
  • Y Y r Fig. 5 is an elevation of a general assembly illustratinga third modification of a manner of exposing various amounts of surface of the deflector blades to passing currents of I have chosen to describe my invention according to a preferred, working combination, and this is illustrated in Fig.
  • Air is blown into the rotat-' ing mill from conduit 3, through a sectiomof pipe 4, and it leaves the mill by. following a path along the outside of pipe 'tand through a barrel 5 into a conduit leadin tothe classifier.
  • the pulverized material is continually being agitated b the/rotation of the mill and the moving air ecomes laden with material and is'then drawn through the barrel where the coarse particles drop out. Some, of. the pulverized material may overfiowat the discharge end of. the mill and fall.
  • a fan 6 is provided which-is 'flV-ltlllll the inner cone.
  • Fig. 2 80 there is fastened to the inner side ofthe inner driven by amotor 7.
  • This fan draws from the top of the classifier through pipe conn'ec-ii. tion 8 and discharges a steady stream of air, laden with an impalpable powder, into a collector 9 which may be of any desirable-de- 5 sign, such as that of the well known cyclone yr i
  • a collector 9 which may be of any desirable-de- 5 sign, such as that of the well known cyclone yr i
  • 10 is the exterior cone which forms the envelope summing the meansby the use and adjustment of which powdered products of varied fineness are obtainable;
  • This-cone may be made rigid enough to support itself or be supported by any suitable structure, and it has near its apex a large opening through which a rapidly moving stream of n'laterial-laden air enters This opening is. connected to. the barrelof the mill by a con-.1 duit 11 andlall the material that enters the. class
  • the inner cone ' for varying the size of the opening.
  • This member may be shaped substantially as shown in Fig. 2 and it is loosely mounted on a rod 17 passing through its axis.
  • the upper end-of the rod is fastened to a bar 18 which extends to'the inner walls of the cone 14 and is fastened thereto by suitable means such as rivets.
  • the lower end of rod 17 is maintainedsin a definite vertical posit'on by e brace 19. A satisfactory manner 0 posi- It is Y the upper edge of the inner cone.
  • tioning the member 16 is by sliding it up or down on rod 17 and locking it in the desired position by means of a large cotter pin or the like passing through holes in the neck 20 and rod 17.
  • a door 21 may be provided for ing than that in the area opposite the central ,girth of the conical member with the result that the tendency ofthe air is to follow along the areabetween the two cones and not enter cone andnear its top a tubular member 22 with its uppercdge on or about a level with Any suitas for example, straps 23, which I have chosen to show in this embodiment.
  • the top of the outer cone consists of a truncated cone 24 having a flange 25 at its base creating a detachable connection with the outer cone 10, and having a neck orpipe 26 connecting it with the exhaust pipe 8.
  • ⁇ Vithinthisneck or pipe there is a sleeve 27 which extends into'the inner chamber and has supported therefrom a closure member 28 consisting of two cones arranged base to base and supported by the suspension rods 29 fastened to sleeve 27.
  • the size of the exhaust is a truncated cone 24 having a flange 25 at its base creating a detachable connection with the outer cone 10, and having a neck orpipe 26 connecting it with the exhaust pipe 8.
  • ⁇ Vithinthisneck or pipe there is a sleeve 27 which extends into'the inner chamber and has supported therefrom a closure member 28 consisting of two cones arranged base to base and supported by the suspension rods 29 fastened to sleeve 27. The size of the exhaust.
  • closure opening is dependent upon-the position of the closure member and this position is adjustable by lock nuts 30 on each rod.
  • the closure opening also eliminates eddy currents at this point and deflects the air in the proper directions.
  • each blade is radially disposed and the top edges are preferably much longer, and, in this embodiment, make an angle of a little'less than 90 with the radial edge.
  • the angularity and length of the top edges is dependent upon the maximum whirling motion desired and is subject to alteration depending upon the capacity ofthe apparatus used and the fineness of material to be produced.
  • the surface between the upper and lower edges of each deflector is curved in such a manner as to give a whirling motion to the passing air, the intensity of which depends on the amount of vertical deflector surface which is exposed to the current of air.
  • the effective surface of the .deflector is determined by thearea that is cov- -ered and comprises-the area exposed to the passing currents of air. 4
  • the length of sleeve 27 has some effecton the selectivity of the classifier and the open end may be positioned in the approximate 'position'illustrated in Fig. 2 or in a raised or lowered positiondepending upon the material that is being produced.
  • Fig. 4 I have illustrated a modified form of my invention, in which the deflector blades are contiguous with and preferably fastened directly to the outer cone along their outer edges and lJO lJlIG COIIG top along their upper edges. and the cylindrical wall 15 of the inner com is within the circle described by the inside edges of the blades.
  • the deflector blades are of a twisted configuration similar to the construction described hereinbefore, except that the horizontal projection of the inner edges describes a circle of slightly greater diameter than the outer diameter of cylindrical wall 15. No member such as collar 22 is necessary in this construction, for the vertical ex posure of the blades is controlled entirely by the position of the inner cone which may be raised and lowered'for the purpose.
  • the material of which the cones and ducts are made comprises preferably sheet metal of suflicient weight to obtain rigidity and strength in construction, and is lapped, riveted, and preferably soldered or welded so as to be certain ofan air-tight condition. It.
  • the curd rent of air will then be whirled by the deflec-v tors an amount depending on the distance of the top of the inner cone from the roof with a consequent drop in velocity, thereby creating a reduction in lifting capacity of the moving air.
  • the smaller of the coarser particles will of themselves dro back to be reconveyed to the pulverizer.
  • the lower part of thedefiectors will be eliminated from functioning and the materialladen air must pass through the deflectors at their greatest pitch. This will create a greater centrifugal action so that only very fine particles will be carried along with the air and out to the collector.
  • the deflector blades are of the same style and disposed similarly to those illustrated in Fig. 4'.
  • a collar 36 is introduced between the inner edges of the 'deflector blades and the cylindrical wall-15 icone couldbe fixed in relation tothe outer cone and all adjustment for difl'erent degrees ingthe effective area of the deflector blades by manipulation of the collar.
  • the delivery conduit 40 of the classifier leads directly into the product collector 41 in which the product is removed from the current of air and the air Withdrawn'from the collector through conduit 42 by fan 43.
  • the exhaust of the fan is connected to the mill by conduit 3, and a vertically disposed pipe 44 exhausts Whatever extra air that is drawn into the system as a result of'infiltration.
  • This pipe is open at its upper end, and a valve 45 may be used to control the amount of air exhausted. Under certain conditions it is preferable to drive air into the classifier directly instead of forcing all of the air through the mill, and this is accomplished by the interpositioning of a by-pass conduit 46 between conduit 3 and conduit 11. Valve 47 is adjustable to regulate the amount of air phat will be delivered directly to the classiier.
  • an outer cone and an illner cone relatively movable and so related in respect to one another as to allow a current of material-laden fluid to flow between their respective surfaces, said inner cone being open at the top and having disposed thereat in definite relation with the outer cone a set of deflectors of twisted configuration for controlling thewhirling effect of the material-laden fluid passing therethrough, and said outer cone having an opening at the bottom for the entrance of material-laden fluid and an exit at the top for the expul sion of the fine product suspended in a current of fluid after the coarser material has been extracted therefrom by the whirling action of the material-laden fluid passing through the deflectors.
  • an outer cone and an inner cone relatively movable and so related in respect to one another as to allow a current of material-laden fluid to flow between their respective surfaces
  • said inner cone being open at the top for permitting the fluid to enter the inner space of said cone and being closed att-he bottom by a conical member except for an annular opening through which passes oversize material discarded by the fluid current which i's'directed towards an exhaust pipe having an entrance through said outercone.
  • an outer cone and an inner cone relatively movable and so related in respect to one another as to allow a current of material-laden fluid to flow between their respective surfaces
  • said inner cone being open at the top for permitting the fluid to enter the inner space of said cone and being closed at the bottom by a conical member except for an annular opening through which may pass oversize material discarded by the fluid current
  • said outer cone having an entrance near its lower end for admitting said current of material-laden fluid,v.an exhaust at its upper end for conducting away the tine product suspended in fluid, and an opening at its lower portion for excluding the extracted coarser materials.
  • an outer casing and a relatively movable inner casing deflectors secured at the top of said outer casing and arranged concentric to the rim of said inner casing and having their lower edges substantially radiallydisposed and their uppercasing in respect to said outer casing and de-' flectors in order to expose a variable amount' of surface of said deflectors to the passage of fluid.
  • an outer casing and a relatively movable inner casing deflectors disposed intermediate the upper extremities of the two casings so as to affect all fluid passing therebetween, and means forcutting out a portion of said deflectors from functional relation with the fluid'currents,
  • an outer casing and a relatively movable inner casing in combination, deflectors having a twisted configuration varying in pitch from one edge to another, and means in-cooperati've relation with said inner casing for rendering ineffective variable amounts of surface of said deflectors.
  • an apparatus for classifying materials comprising in combination an outer casing and an inner casing describing two spaces, deflectors disposed therebetween to aflect the passage of fluid from one space to another, and means for varying the efleetive surface of said deflectors to change the course of the passing currents of fluid.
  • an apparatus for classifying materials comprising in combination an outer casing and an inner casing describing two spaces,'deflectors disposed therebetween to affect the passage of fluid from one space to another, means for covering a portion of said deflectors, and adjusting means for moving said inner casing and for varying the amount of covered surfaces of said deflectors.
  • an apparatus for classifying materials comprising in combinationan outer casing and an inner casing describing two spaces, deflectors disposed therebetween to affect the passage of fluid from one space to another, means for covering a portion of said deflectors, and means for independently moving saidinner casing.
  • an apparatus for classifying materials comprising in combination, an outer casing and an inner casing describing two spaces, the'outer space being adapted to be varied in cross sectional area throughout its length, deflectors interposed in communication between the two spaces, and means for simultaneously varying the amount of cross 4 sectional area and the eflective surface of the deflectors.
  • an outer casing and an inner easing having an opening near its lower portion, a valve member normally extending within said opening and having a portion thereof of greater girth than the opening for preventing fluid currents from entering the inner casing throughsaid opening and permitting the discharge of solid material from the inner easing, and means for adjusting the relative position of the valve member.
  • an apparatus of the class described comprising, in combination, an outer casing having inlet and outlet openings, an inner casing having an open side for permitting material-laden fluid to enter from the outer side of said inner casing, deflectors disposed in the path of material-laden fluid flowing along the outer side of said inner easing, and means for varyingthe amount of area of said deflectors which is efi'ective to deflect the material-laden fluid flowing from between the inner and-outer casings and towards said open side of said inner casing.
  • a container for separating materials comprising in combination, a container for separating materials, said container having inlet and outlet openings, a casing'within said container, deflector blades intermediate said inlet and outlet openings,and means for varying the area of said deflector blades effcctive upon the fluid advancing toward said outlet opening.
  • a container for separating materials comprisingin combination, a container for separating materials, said container having inlet and outlet openings, a casing having 75 an opening therein, and a valve member for said opening, said valve member being conoidal and having two apices, one of which extends into said opening, and the other of which extends away from saidcasing whereby fluid currents are prevented from entering said inner casing through said opening.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Cyclones (AREA)
  • Disintegrating Or Milling (AREA)
  • Crushing And Grinding (AREA)
US53174A 1925-08-28 1925-08-28 Dust classifier Expired - Lifetime US1709848A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US53174A US1709848A (en) 1925-08-28 1925-08-28 Dust classifier
GB32573/26A GB263820A (en) 1925-08-28 1926-01-26 Improvements in and relating to apparatus for classifying pulverized materials
GB2279/26A GB257568A (en) 1925-08-28 1926-01-26 Improvements in apparatus for classifying materials
DEH109717D DE478298C (de) 1925-08-28 1926-02-06 An eine Muehle angeschlossene Sichtanlage
DEH105262D DE470613C (de) 1925-08-28 1926-02-06 Sichtvorrichtung mit einem aeusseren und einem inneren Gehaeuse
US243824A US1721594A (en) 1925-08-28 1927-12-31 Classification system for pulverized materials

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Application Number Priority Date Filing Date Title
US53174A US1709848A (en) 1925-08-28 1925-08-28 Dust classifier

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US1709848A true US1709848A (en) 1929-04-23

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US53174A Expired - Lifetime US1709848A (en) 1925-08-28 1925-08-28 Dust classifier

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US (1) US1709848A (de)
DE (2) DE470613C (de)
GB (2) GB257568A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2470315A (en) * 1944-04-29 1949-05-17 Wallace L Mcgehee Multiple stage pulverizing and dehydrating tube mill
US2638219A (en) * 1950-03-13 1953-05-12 Farm Production Engineers Inc Material separating apparatus
US2730999A (en) * 1949-09-30 1956-01-17 Birkner Max Furnace and boiler plant
US2835719A (en) * 1954-01-23 1958-05-20 Bazalgette Guy Manufacture of storage battery plates
US2922586A (en) * 1954-02-18 1960-01-26 Hardinge Harlowe Comminuting and classifying system and method
WO2015033312A3 (en) * 2013-09-09 2015-06-25 Coal Milling Projects (Pty) Limited Static classifier
US9211547B2 (en) 2013-01-24 2015-12-15 Lp Amina Llc Classifier

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE939123C (de) * 1952-04-01 1956-02-16 Miag Vertriebs Gmbh Verfahren und Vorrichtung zum pneumatischen Foerdern oder auch Sichten von Schuettgut
DE1212824B (de) * 1962-06-22 1966-03-17 Polysius Gmbh Sichtermahlanlage
DE2505379C2 (de) * 1975-02-08 1987-02-26 Loesche Hartzerkleinerungs- und Zementmaschinen KG, 4000 Düsseldorf Gasstromsichter, insbesondere zur Anordnung über einer Wälzmühle

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2470315A (en) * 1944-04-29 1949-05-17 Wallace L Mcgehee Multiple stage pulverizing and dehydrating tube mill
US2730999A (en) * 1949-09-30 1956-01-17 Birkner Max Furnace and boiler plant
US2638219A (en) * 1950-03-13 1953-05-12 Farm Production Engineers Inc Material separating apparatus
US2835719A (en) * 1954-01-23 1958-05-20 Bazalgette Guy Manufacture of storage battery plates
US2922586A (en) * 1954-02-18 1960-01-26 Hardinge Harlowe Comminuting and classifying system and method
US9211547B2 (en) 2013-01-24 2015-12-15 Lp Amina Llc Classifier
WO2015033312A3 (en) * 2013-09-09 2015-06-25 Coal Milling Projects (Pty) Limited Static classifier
GB2532172A (en) * 2013-09-09 2016-05-11 Coal Milling Projects (Pty) Ltd Static classifier
US9981290B2 (en) 2013-09-09 2018-05-29 Coal Milling Projects (Pty) Limited Static classifier

Also Published As

Publication number Publication date
GB257568A (en) 1927-01-13
GB263820A (en) 1927-03-31
DE470613C (de) 1929-01-25
DE478298C (de) 1929-06-22

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