US2973861A - Method and means for regulating the sizing operation of an air classifier - Google Patents
Method and means for regulating the sizing operation of an air classifier Download PDFInfo
- Publication number
- US2973861A US2973861A US805984A US80598459A US2973861A US 2973861 A US2973861 A US 2973861A US 805984 A US805984 A US 805984A US 80598459 A US80598459 A US 80598459A US 2973861 A US2973861 A US 2973861A
- Authority
- US
- United States
- Prior art keywords
- classifier
- fines
- regulating
- speed
- air classifier
- 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
Links
Images
Classifications
-
- 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
Definitions
- a continuous adaptation of the classifying operation to the desired degree of uniformity of the separated fines is achieved.
- the specimen quantity may be continuously taken from the material fed into the classifier, for controlling the size-determining speed of the drive.
- the material to be classified by air sizing is supplied into the hopper 2 of the classifier 1, as is schematically indicated by an arrow A.
- the material containing a mixture of grains of various sizes, drops onto a' whirling disc 3 which is driven from a motor 3a. Due to the centrifugal action of the disc 3, the material is spread outwardly and is subjected to the centrifugal action of a fan system 4 whose vertical shaft 4a is driven through a belt transmission 4b and a speed-reducing transmission 5 from a motor 6.
- the coarse particles are flung outwardly against the peripheral inner wall 1a of the classifier and drop into the funnel-shaped bottom portion 1b of that wall whence they drain through an outlet conduit 10 as is. indicated by an arrow B.
- the fines to be separately collected are blown upwardly and pass through a top opening 1d to an annular space 1e and into the funnel-shaped bottom portion 1f of the classifier housing from which they drain through a conduit 7.
- a fan 4c in the top portion of the structure fastened to the fan 4 and also driven from shaft 4a provides the required up-draft for drawing the fines through opening 1d.
- a specimen receiver 8 Inserted into the flow of fines issuing from conduit 7, this flow being schematically represented by an arrow C, is a specimen receiver 8 which continuously collects a branched-off flow of material and passes it onto a test screen 9 or sifter, for example of the vibratory type.
- the proportion of fines within the permissible size limit is sifted oif through the screen, and all oversize particles are conveyed by the screen 9 down in the direction shown by arrow D onto an endless-belt type weighing scale 10 which is adjusted to the permissible amount, by weight, of the quantity of oversize material.
- Theendless belt rotates at constant speed so that the scale measures the oversize material by weight per time unit.
- An air classifying apparatus comprising a classifier having a centrifugal system whose speed determines the grain size of the fines being separated, said classifier having an outlet conduit for the separated fines and having a variable-speed drive connected with said system, a specimen receiver in the flow path of said outlet conduit for continuously withdrawing a specimen quantity of fines, said receiver having an overflow, a screening device mounted for continuously receiving material from said overflow and adapted to separate from "said material the component content of material beyond agivengrain size, an endless-belt weighing scale mounted to continuously receive said content from said receiving device and having a member movable in opposite directions from a balance position in response to departure of the Weight per time unit of said content from a given range, and speed control means connected with said drive and controlled by said member for accelerating and decelerating said centrifugal system in dependence upon said departure so as to maintain the grain size of the separated fines within a given range of uniformity.
Landscapes
- Combined Means For Separation Of Solids (AREA)
Description
March 7, 1961 H. JAGER 2,973,861: METHOD AND MEANS FOR REGULATING THE SIZING OPERATION OF AN AIR CLASSIFIER Filed April 13, 1959 United States Patent METHOD AND MEANS FOR REGULATING THE SIZING OPERATION OF AN AIR CLASSIFIER Heinz Jiiger, Bochum-Riemke, Germany, assignor to Westfalia Dinnendahl Groppel Aktiengesellschaft, Bochum, Germany, a corporation of Germany Filed Apr. 13, 1959, Ser. No. 805,984
3 Claims. (Cl. 209-1) tom used in the classifier for winnowing the fine material from the coarse residue. Such adjustment of the centrifugal system may be eifeoted manually when the classifier is at rest, or may be effected during operation of the classifier by regulating the speed of the motor driving the centrifugal system. However, before making any such regulatory adjustment, a test quantity of the separated fine material must be withdrawn and the amount of oversize grains must be determined. Heretofore, this manner of regulation for desired uniformity of the fines has been performed only intermittently with relatively long intermediate intervals of time during which the classifier may not operate satisfactorily.
It is an object of my invention to eliminate this disadvantage and to always secure obtaining separated fines of best possible uniformity.
To this end, and in accordance with a feature of my invention, I apply an automatic regulating method according to which a partial flow of the separated fines is tapped oil the classifier, and the proportion of oversize material in these fines is continuously determined, for example mechanically by sifting, or by optical means, or any other suitable manner, whereafter the quantity of the oversize material or a measuring instrument responding to that quantity is caused to impose a corresponding speed control upon the drive for the centrifugal fan or other driven classifier component whose speed determines the size range of the separated fines. In this manner a continuous adaptation of the classifying operation to the desired degree of uniformity of the separated fines is achieved.
According to another, less preferred feature of the invention the specimen quantity may be continuously taken from the material fed into the classifier, for controlling the size-determining speed of the drive.
The invention will be further described with reference to the embodiment of a driven centrifugal-type air classifier illustrated by way of example on the accompanying drawing by a vertical section of the classifier proper and a schematic diagram of its control components.
The material to be classified by air sizing is supplied into the hopper 2 of the classifier 1, as is schematically indicated by an arrow A. The material, containing a mixture of grains of various sizes, drops onto a' whirling disc 3 which is driven from a motor 3a. Due to the centrifugal action of the disc 3, the material is spread outwardly and is subjected to the centrifugal action of a fan system 4 whose vertical shaft 4a is driven through a belt transmission 4b and a speed-reducing transmission 5 from a motor 6. The coarse particles are flung outwardly against the peripheral inner wall 1a of the classifier and drop into the funnel-shaped bottom portion 1b of that wall whence they drain through an outlet conduit 10 as is. indicated by an arrow B.
The fines to be separately collected are blown upwardly and pass through a top opening 1d to an annular space 1e and into the funnel-shaped bottom portion 1f of the classifier housing from which they drain through a conduit 7. A fan 4c in the top portion of the structure fastened to the fan 4 and also driven from shaft 4a provides the required up-draft for drawing the fines through opening 1d.
Inserted into the flow of fines issuing from conduit 7, this flow being schematically represented by an arrow C, is a specimen receiver 8 which continuously collects a branched-off flow of material and passes it onto a test screen 9 or sifter, for example of the vibratory type. The proportion of fines within the permissible size limit is sifted oif through the screen, and all oversize particles are conveyed by the screen 9 down in the direction shown by arrow D onto an endless-belt type weighing scale 10 which is adjusted to the permissible amount, by weight, of the quantity of oversize material. Theendless belt rotates at constant speed so that the scale measures the oversize material by weight per time unit. When the amount being weighed passes above or below the adjusted limits, the movable beam of the weighing scale actuates one or the other of two electric contacts 11, 12 which control the drive motor 6 so as to either increase or de crease the rotating speed of the centrifugal system 4 as required for maintaining the degree of non-uniformity of the fines within the proper limits. As shown,;a recording measuring instrument 13 may be inserted into the control circuit of contacts 11, 12.
By virtue of the continuous withdrawal of a'sm'all specimen quantity from the flow of fines issuing from the classifier and the dependence of the driving speed upon the continuously measured value, a continuous supervi-' sion and regulation is achieved with the result o-falways maintaining the separated fines within the desired uniformity limits.
It will be obvious to those skilled in the art, upon a study of this disclosure, that my invention can be performed with the aid of apparatus other than specifically illustrated and described herein, without departing from the essential features of my invention and within the scope of the claims annexed hereto.
I claim:
1. An air classifying apparatus comprising a classifier having a centrifugal system whose speed determines the grain size of the fines being separated, said classifier having an outlet conduit for the separated fines and having a variable-speed drive connected with said system, a specimen receiver in the flow path of said outlet conduit for continuously withdrawing a specimen quantity of fines, said receiver having an overflow, a screening device mounted for continuously receiving material from said overflow and adapted to separate from "said material the component content of material beyond agivengrain size, an endless-belt weighing scale mounted to continuously receive said content from said receiving device and having a member movable in opposite directions from a balance position in response to departure of the Weight per time unit of said content from a given range, and speed control means connected with said drive and controlled by said member for accelerating and decelerating said centrifugal system in dependence upon said departure so as to maintain the grain size of the separated fines within a given range of uniformity.
2. Their classifying apparatus according to claim 1, said drive comprising an electric variable-speed motor having a speed-control circuit, and said movable member References Cited in the file of this patent UNITED STATES PATENTS Blomfield Mar. 15, 1927 Haglund June 3, 1958
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US805984A US2973861A (en) | 1959-04-13 | 1959-04-13 | Method and means for regulating the sizing operation of an air classifier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US805984A US2973861A (en) | 1959-04-13 | 1959-04-13 | Method and means for regulating the sizing operation of an air classifier |
Publications (1)
Publication Number | Publication Date |
---|---|
US2973861A true US2973861A (en) | 1961-03-07 |
Family
ID=25193026
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US805984A Expired - Lifetime US2973861A (en) | 1959-04-13 | 1959-04-13 | Method and means for regulating the sizing operation of an air classifier |
Country Status (1)
Country | Link |
---|---|
US (1) | US2973861A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3441133A (en) * | 1966-05-04 | 1969-04-29 | Mench & Miksits Research & Mfg | Vane control for air classifier |
US3515144A (en) * | 1967-07-19 | 1970-06-02 | Deere & Co | Device for sensing operating conditions in a harvesting machine |
FR2328526A1 (en) * | 1975-10-24 | 1977-05-20 | Polysius Ag | AIR SEPARATOR USING RECYCLED AIR AND HAVING A VERTICAL AXIS |
FR2457719A1 (en) * | 1979-05-28 | 1980-12-26 | Hosokawa Micron Kk | PARTICLE SORTING APPARATUS |
US4409096A (en) * | 1980-07-15 | 1983-10-11 | Coal Industry (Patents) Ltd. | Control systems for material treatment plant |
US4544101A (en) * | 1982-04-09 | 1985-10-01 | Penn Virginia Corporation | Differential rate screening |
US4627576A (en) * | 1982-04-09 | 1986-12-09 | William F. Hahn | Differential rate screening |
US4991721A (en) * | 1988-08-15 | 1991-02-12 | Iowa State University Research Foundation, Inc. | Automation of an air-screen seed cleaner |
US5152604A (en) * | 1989-07-24 | 1992-10-06 | Fuller Company | Recirculating debris separating method and apparatus |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1621474A (en) * | 1919-05-17 | 1927-03-15 | Alfred L Blomfield | Ore-treating system |
US2837271A (en) * | 1950-12-29 | 1958-06-03 | Separator Ab | Method and apparatus for regulating the fat content of centrifugally separated cream |
-
1959
- 1959-04-13 US US805984A patent/US2973861A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1621474A (en) * | 1919-05-17 | 1927-03-15 | Alfred L Blomfield | Ore-treating system |
US2837271A (en) * | 1950-12-29 | 1958-06-03 | Separator Ab | Method and apparatus for regulating the fat content of centrifugally separated cream |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3441133A (en) * | 1966-05-04 | 1969-04-29 | Mench & Miksits Research & Mfg | Vane control for air classifier |
US3515144A (en) * | 1967-07-19 | 1970-06-02 | Deere & Co | Device for sensing operating conditions in a harvesting machine |
FR2328526A1 (en) * | 1975-10-24 | 1977-05-20 | Polysius Ag | AIR SEPARATOR USING RECYCLED AIR AND HAVING A VERTICAL AXIS |
FR2457719A1 (en) * | 1979-05-28 | 1980-12-26 | Hosokawa Micron Kk | PARTICLE SORTING APPARATUS |
US4292172A (en) * | 1979-05-28 | 1981-09-29 | Kabushiki Kaisha Hosokawa Funtai Kogaku Kenkyusho | Apparatus for classifying particles |
US4409096A (en) * | 1980-07-15 | 1983-10-11 | Coal Industry (Patents) Ltd. | Control systems for material treatment plant |
US4544101A (en) * | 1982-04-09 | 1985-10-01 | Penn Virginia Corporation | Differential rate screening |
US4627576A (en) * | 1982-04-09 | 1986-12-09 | William F. Hahn | Differential rate screening |
US4991721A (en) * | 1988-08-15 | 1991-02-12 | Iowa State University Research Foundation, Inc. | Automation of an air-screen seed cleaner |
US5152604A (en) * | 1989-07-24 | 1992-10-06 | Fuller Company | Recirculating debris separating method and apparatus |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2973861A (en) | Method and means for regulating the sizing operation of an air classifier | |
EP0082125B1 (en) | An arrangement in machines for separating materials having different aerodynamic properties | |
US5110056A (en) | Method and apparatus for reducing brittle material for subsequent grinding | |
US2795329A (en) | Separation of granular materials | |
US4687105A (en) | Arrangement in grading and cleaning machines with screens | |
US4300201A (en) | Method and apparatus for ascertaining the bulk weight of tobacco or the like | |
US2164796A (en) | Method and apparatus for feeding coal | |
US3807552A (en) | Apparatus for cooling and classifying ground material | |
DK151047B (en) | PROCEDURE FOR OPERATING A PROPERTY AND PROJECTS FOR EXERCISING THE PROCEDURE | |
US2546068A (en) | Method and apparatus for dividing pulverous material into desired fractions by means of a rotating sifting machine | |
US2026910A (en) | Separator for seeds or the like | |
US2274887A (en) | Apparatus for separating commingled stock | |
US2382168A (en) | Apparatus for sorting granular material according to its moisture content | |
US2667969A (en) | Air separator for reclaiming abrasives from waste materials | |
US1564508A (en) | Blast sifter | |
US527860A (en) | Hermann friedrich martin kayser | |
US2321514A (en) | Separating process and apparatus | |
SU1265004A1 (en) | Classifier for loose materials | |
US1165866A (en) | Separator. | |
SU1140713A1 (en) | Pneumatic classifier of granular materials | |
US2812060A (en) | hearn | |
RU2746722C1 (en) | Screening machine control method | |
US1159030A (en) | Pneumatic sifter. | |
SU1304925A1 (en) | Method of separating granular mixtures | |
USRE8628E (en) | Improvement in machines for separating grain |