US3910563A - Apparatus for mixing, separating or sorting dry substances or articles - Google Patents

Apparatus for mixing, separating or sorting dry substances or articles Download PDF

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Publication number
US3910563A
US3910563A US412409A US41240973A US3910563A US 3910563 A US3910563 A US 3910563A US 412409 A US412409 A US 412409A US 41240973 A US41240973 A US 41240973A US 3910563 A US3910563 A US 3910563A
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US
United States
Prior art keywords
drum
outlet
mixing
throat
outlet throat
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
US412409A
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English (en)
Inventor
Bastiaan Vissers
Willem Teunissen
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.)
IJMI BV
Original Assignee
Individual
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Filing date
Publication date
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Publication of US3910563A publication Critical patent/US3910563A/en
Assigned to IJMI B.V. reassignment IJMI B.V. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: EXPERT N.V.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F29/00—Mixers with rotating receptacles
    • B01F29/60—Mixers with rotating receptacles rotating about a horizontal or inclined axis, e.g. drum mixers
    • B01F29/63—Mixers with rotating receptacles rotating about a horizontal or inclined axis, e.g. drum mixers with fixed bars, i.e. stationary, or fixed on the receptacle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F29/00—Mixers with rotating receptacles
    • B01F29/25—Mixers with rotating receptacles with material flowing continuously through the receptacles from inlet to discharge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/48—Washing granular, powdered or lumpy materials; Wet separating by mechanical classifiers
    • B03B5/56—Drum classifiers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F29/00—Mixers with rotating receptacles
    • B01F29/40—Parts or components, e.g. receptacles, feeding or discharging means
    • B01F29/403—Disposition of the rotor axis
    • B01F29/4033—Disposition of the rotor axis inclined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F29/00—Mixers with rotating receptacles
    • B01F29/40—Parts or components, e.g. receptacles, feeding or discharging means
    • B01F29/403—Disposition of the rotor axis
    • B01F29/4034—Disposition of the rotor axis variable, e.g. tiltable during the operation

Definitions

  • This invention relates to the mixing, separating or sorting of dry substances or articles.
  • Mixing apparatus consisting of a horizontal drum which is rotatable about its longitudinal axis and which has an inlet opening for the substances for mixing at one end and an outlet opening for the resulting mixture at or near the other end.
  • Such apparatus is used mainly for mixing concrete, for which purpose a water supply pipe is provided in the drum and the latter slopes downwards from the inlet to the outlet end.
  • apparatus of the above type can also be used satisfactorily by mixing dry substances, for example sand-with soot, sand with lime and cement or the like, provided that special precautions are taken to ensure good mixing. It has also been found that the resulting apparatus in certain cases also offers the possibility of separating or sorting dry substances or articles, as the user requires.
  • the invention provides an apparatus of the above type, which is characterised in that an underlying descriptive line of the drum viewed in the direction from the inlet end to the outlet end slopes upwardly at least for a part.
  • an underlying descriptive line of the drum viewed in the direction from the inlet end to the outlet end slopes upwardly at least for a part.
  • the retardation in discharge speed will be greater for one substance than the other.
  • this difference in speed of discharge can be compensated for by a greater quantity by weight or volume of the other substance with respect to the first substance, so that the total quantity of material of an introduced charge or the total quantity of material introduced per unit of time always leaves the drum practically simultaneously.
  • the effect of the slope in the underlying descriptive line is then a more uniform discharge of material together with better mixing.
  • the upward inclination of an underlying descriptive line of the drum can be obtained in various ways.
  • a cylindrical drum can be disposed at an angle, or alternatively a frusto-conical drum can be used, having a diameter decreasing in the direction from the inlet end to the outlet end. Both drums result in an extension of the residence time, but the first drum has a greater distance for the same inlet diameter.
  • the advantages of extended residence time and high capacity are combined in a drum which is substantially cylindrical and which just by the outlet end has a frusto-conical part having a diameter decreasing in the direction of said outlet end.
  • the angle of inclination of the underlying descriptive line to the horizontal need not be identical for these three types, but is usually between 0 and 20.
  • the drum can be adapted to all possible operating conditions and, more particularly, a greater or smaller extension'of the residence time can be used according as the relative specific gravities, relative quantities, particle size and particle shape of the substance for mixing vary.
  • the axial length of the drum wall is several times greater than the diameter. This results in a relatively long contact time between the particles of the substances for mixing and hence a good mixing or separation.
  • a following feature of the invention is that the drum is rotated by a transmission having a variable speed of revolution.
  • the drum can be rotated selectively at higher or slower speed so that the circulation of the material in the drum can be varied transversely and the linear speed of said material can be varied longitudinally as circumstances require.
  • This step can also contribute in influencing the contact time between the substances for mixing. In many cases in practice a speed of 6 revolutions per minute will be ad equate, but in other cases a variable speed is better.
  • the drum wall is internally provided with longitudinal ribs having a triangular or rectangular section.
  • the effect of this is that the drum contents are circulated more in the transverse direction, the speed of conveyance of the material in the longitudinal direction of the drum being checked.
  • Triangular ribs lift the material to a limited degree during the rotation of the drum while rectangular ribs lift the material higher.
  • FIG. 1 illustrates a first embodiment of the apparatus in side elevation.
  • FIG. 2 shows a second embodiment of the apparatus in side elevation.
  • FIG. 3 shows a third embodiment of the apparatus in side elevation.
  • FIGS. 4 and 5 are partial cross-sections to an enlarged scale showing specific details.
  • FIG. 1 comprises a horizontal cylindrical drum 1 which rests on supporting rollers 3 by means of peripheral rails 2 so as to be rotatable about its longitudinal axis. Said drum is intended primarily for mixing dry substances.
  • the .drum 1 has a widening inlet zone 4 with an inlet opening 5, into which lead vibratory chutes 6 and 11 to supply the dry substances for mixing.
  • the drum has a widening outlet zone 7 with an outlet opening 8 followed by a discharge chute 9 and a conveyor belt 10 for the resulting mixture.
  • the axial length of. the drum is generally several times larger than the diameter.
  • the interior of the drum 1 may be smooth or bear longitudinal ribs 15 or 16 having a triangular or rectangular cross-section (FIGS. 4 and 5).
  • the supporting rollers 3 have been disposed beneath the drum in the drawing plane, although it will be apparent that in actual fact they are disposed in pairs somewhat laterally of the drum. They bear. double flanges 17in order to obviate lateral displacements of the rails 2.
  • the rollers 3 are mounted in brackets 18 on a base plate 19. The latter also bears a motor 20, which drives the drum l by means of a trans mission 21 with a change-speed gear, and also a gear rim 22.
  • the base plate 19 bears on the floor by means of a pivot connection 23 while the other end (corresponding to theoutlet end of the drum 1) rests on a vertical screw spindle 24 which can be screwed up and down by means of a nut 25 bearing on the floor.
  • a vertical screw spindle 24 which can be screwed up and down by means of a nut 25 bearing on the floor.
  • the system shown in FIG. 2 differs from the system shown in FIG'. 1 only in that it comprises adrum 26 which is not cylindrical but frusto-conical, with a diameter'decreasing towards the outlet end.
  • the other components are the same.
  • the angle of inclination between thedrum wall and the longitudinal axis of the drum 26 is' approximately in the drawing, although .values from 0 to 20 are generally possible.
  • This drum is also disposed on an adjustable base plate 19.
  • the system shown in FIG. 3 differs from that shown in FIGS. 1 and- 2'in that it comprises a drum 27 which is substantially cylindrical (part 11a) and has near the outlet end a frusto-conicalpart 12a having a diameter decreasing in the direction of the said outlet end.
  • the other parts are the same.
  • the angle of inclination between the drum wall and the drum longitudinal axis in the part 12a is greater than the inclination in the drums shown in FIGS. 1 and 2 and according to the drawings is about although generally values from 0 to are possible.
  • This drum is also disposed on an adjustable base plate 19.
  • the drum shown in FIG. 1 has a greater capacity than that shown in FIG. 2, while conversely the increase in the residence time of the material in the drum embodiment shown in FIG. 2 can be controlled more sharply than with that shown in FIG. 1.
  • the embodiment according'to FIG. 3 combines the advantages of both drums.
  • the base plate 19 Prior to the operation of the system shown in FIG. 1, the base plate 19 is first brought into an inclined position by means of the screw spindle 24 so thatan underlying descriptive line of the drum viewed in the direction from the inlet to the outlet end always slopes upwards.
  • the value of the angle of inclination depends on the required residence time of the substances for mixing in the drum, and this is in turn dependent upon the relative weights, specific gravities, particle size and particle shape of the substances for mixing. Although values between 0 and 20 are generally possible, an angle of 10 has been assumed in the drawing.
  • an underlying descriptive line of the drum 26 will have an upward inclination even when the base plate 19 is in a horizontal position. Nevertheless, it is again possible prior to operation to bring the base plate 19 into an inclined position in order to increase the angle of inclination of the underlying descriptive line of the drum.
  • the total range of possible values for the angle of inclination is still between 0 and 20.
  • an underlying descriptive line of the drum 27 will have an upward inclination in its last part even when the base plate 19 is in a horizontal position. Nevertheless, it is again possible prior to operation to bring the base plate 19 into an inclined position in order to increase the angle of of inclination of the underlying descriptive line.
  • the range of angles of inclination as a whole is still restricted to values between 0 and 20.
  • the change-speed gear of the motor transmission 21 is so adjusted that the drum is driven at a speed (for example 7 revolutions per minute or generally 5-10 revolutions per minute) corresponding to the required circulation conditions of the material in the drum.
  • the drum 1 or 26 or 27 rotates about its longitudinal axis at the speed to which it has been adjusted.
  • the dry substances for mixing for example sand and cement, are fed to the drum continuously or intermittently via the vibratory chutes 6 and 11.
  • the substances remain in the drum for some time, are turned over and over therein and are also gradually conveyed in the direction of the outlet end.
  • the system according to the invention provides good facilities for increasing or reducing the residence time and changing the circulation.
  • the inclined position of an underlying descriptive line of the drum which inclined position is also selectively adjustable ensures that the dry substances for mixing must move against an inclination during conveyance through the drum, and this gives a reliable retardation and hence an increase in the residence time as compared with conditions having a purely horizontal or downwardly sloping descriptive line.
  • the relatively considerable axial length of the drum helps in this respect.
  • the same effect is obtained by the longitudinal ribs in the drum, which transversely lift the material to a varying extent and thus check conveyance through the drum.
  • the longitudinal ribs also ensure a change of circulation in the transverse direction so that the contact between the particles of the substance for mixing changes.
  • a similar change can be also obtained by varying the speed of revolution of the drum by means of the change-speed gear of the motor transmission.
  • it is possible to adjust to various circumstances and mixing can alline of the drum causes the conveyance of one substance of higher specific gravity to be retarded more intensely than the other of lower specific gravity but his difference can be compensated by the greater quantity by weight of lighter substance as compared with the heavier, so that the total quantity of material of a charge or the quantity of material supplied per unit of time nevertheless leaves the drum practically simultaneously.
  • the mixture is homogeneously mixed and can immediately be used for all kinds of application.
  • the apparatus according to the invention also offers the possibility of separating or sorting these materials.
  • the mixture is fed to the inlet end and efficient use is made of the fact that the upward slope of the underlying descriptive line of the drum causes a difference in the retardation of the components of the mixture. It is then a simple matter to control the residence time and the circulation conditions by variation of the above-mentioned parameters so as to achieve good separation or sorting.
  • the only alteration necessary to the embodiments illustrated in that case is the provision of more than one discharge chute at the drum outlet end.
  • the apparatus of the invention may further be used for granulating substances.
  • the drum is provided with a spray conduit introduced through one of its ends. Water or another fluid is dispensed in the drum during operation and this fluid together with the rotative movement of the drum will result in an effective agglomeration of particles to form granules.
  • the apparatus may also be used for drying pulverulent substances introduced in wet state. This drying process may be promoted by connecting an air suction device to the inlet end of the drum.
  • the drum may be provided with several additional appliances such as spray conduits, air suction devices, gas feeding devices and the like. Further, the drum may have been made of corrosion-resistant material in order to withstand agressive substances. All these variants are within the scope of the invention.
  • Apparatus for treating dry materials comprising the combination of:
  • an elongate, generally horizontal drum having an inlet end of diverging cross section to define a material-receiving space, and having an outlet end defining an outlet throat of selected diameter, said drum being mounted such that the lowest point of said outlet throat is higher than said materialreceiving space whereby dry material disposed in said material-receiving space must be elevated in order to pass through said outlet throat, said drum having a section between its inlet and outlet ends, and leading to said outlet throat, which inclines upwardly to said outlet throat;
  • Apparatus as defined in claim 1 including longitudinally extending ribs on the inner surface of said drum for retarding migration of dry materials to said outlet throat.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
US412409A 1972-11-03 1973-11-02 Apparatus for mixing, separating or sorting dry substances or articles Expired - Lifetime US3910563A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7214934A NL7214934A (ja) 1972-11-03 1972-11-03

Publications (1)

Publication Number Publication Date
US3910563A true US3910563A (en) 1975-10-07

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ID=19817300

Family Applications (1)

Application Number Title Priority Date Filing Date
US412409A Expired - Lifetime US3910563A (en) 1972-11-03 1973-11-02 Apparatus for mixing, separating or sorting dry substances or articles

Country Status (8)

Country Link
US (1) US3910563A (ja)
JP (1) JPS4995257A (ja)
DE (1) DE2354627A1 (ja)
FR (1) FR2205357B1 (ja)
GB (1) GB1455297A (ja)
IT (1) IT1005172B (ja)
NL (1) NL7214934A (ja)
SE (1) SE394616B (ja)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4501499A (en) * 1983-09-15 1985-02-26 Purex Corporation Agglomerator
US4624576A (en) * 1985-06-26 1986-11-25 Bituma Construction Equipment Company Adjustment of drum mixer trunnions
US4832500A (en) * 1985-06-28 1989-05-23 National Research Development Corporation Mixing apparatus and processes
US5607232A (en) * 1995-12-13 1997-03-04 Dahl; Joel M. Asphalt plant drum drive
US20080225631A1 (en) * 2007-03-13 2008-09-18 Stephen Ferris Continuous feed cement mixer
US20120097048A1 (en) * 2009-09-02 2012-04-26 Stefano Tomatis Curd kneading apparatus for production of pasta-filata cheese
CN102784711A (zh) * 2012-08-05 2012-11-21 李金泉 洗矿擦洗分级机
CN106268509A (zh) * 2016-08-05 2017-01-04 佛山科学技术学院 一种陶瓷原料干粉末抛粉喷雾造粒装置
CN107138385A (zh) * 2017-05-12 2017-09-08 刘春燕 一种桥梁护栏浇注用砂子高效过筛装置

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2567414B1 (fr) * 1984-07-10 1990-03-23 Menaut Michel Appareil pour la preparation d'un melange de granulats
DE3437709A1 (de) * 1984-10-15 1986-04-17 Hans-Ulrich Dipl.-Ing.(FH) 7550 Rastatt Jung Trommelsieb
JPS63270537A (ja) * 1986-12-24 1988-11-08 Shimazu Kogyo Kk 粉粒体定量供給装置
DE8802064U1 (de) * 1988-02-18 1988-06-01 Sommer, Peter, 74722 Buchen Vorrichtung zum Mischen von Gemüse, Salaten od. dgl.
JPH02152534A (ja) * 1988-12-05 1990-06-12 Shokichi Matsui 回転式連続混合装置
IT234811Y1 (it) * 1994-05-12 2000-03-16 Riccardo Righetti Miscelatore in continuo per materiali allo stato polverulento.
GB0609442D0 (en) * 2006-05-12 2006-06-21 Woodside Engineering Services A rotary drum screen apparatus
CN111346808A (zh) * 2020-03-11 2020-06-30 安徽宇特机械有限公司 一种环保的谷物筛分用圆筒筛

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1991959A (en) * 1931-10-30 1935-02-19 Baker Perkins Co Inc Continous mixer for dough and the like substances
US3071295A (en) * 1958-04-18 1963-01-01 Richard V Heller Bulk feeding apparatus
US3328006A (en) * 1966-09-12 1967-06-27 Rex Chainbelt Inc Concrete mixer drum
US3479271A (en) * 1965-07-07 1969-11-18 Paul W Sandrock Drum for plating,blackening,pickling and the like
US3765653A (en) * 1971-12-17 1973-10-16 Nat Distillers Chem Corp Reactor for preparing an easily compactable material

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB211965A (en) * 1922-11-30 1924-02-29 John Faulder Burn Machine for mixing or washing viscous, plastic, or pulverulent substances
FR689042A (fr) * 1929-01-30 1930-09-01 Hardinge Co Inc Perfectionnements aux appareils de broyage des minerais et autres matières
DE2033365A1 (de) * 1970-07-06 1972-01-13 Wedag Westfaha Dinnendahl Groppel AG, 4630 Bochum Autogen Trommelmühle
US3752445A (en) * 1971-10-19 1973-08-14 Munson Mill Machinery Co Screw lifter mixer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1991959A (en) * 1931-10-30 1935-02-19 Baker Perkins Co Inc Continous mixer for dough and the like substances
US3071295A (en) * 1958-04-18 1963-01-01 Richard V Heller Bulk feeding apparatus
US3479271A (en) * 1965-07-07 1969-11-18 Paul W Sandrock Drum for plating,blackening,pickling and the like
US3328006A (en) * 1966-09-12 1967-06-27 Rex Chainbelt Inc Concrete mixer drum
US3765653A (en) * 1971-12-17 1973-10-16 Nat Distillers Chem Corp Reactor for preparing an easily compactable material

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4501499A (en) * 1983-09-15 1985-02-26 Purex Corporation Agglomerator
US4624576A (en) * 1985-06-26 1986-11-25 Bituma Construction Equipment Company Adjustment of drum mixer trunnions
US4832500A (en) * 1985-06-28 1989-05-23 National Research Development Corporation Mixing apparatus and processes
US5607232A (en) * 1995-12-13 1997-03-04 Dahl; Joel M. Asphalt plant drum drive
US20080225631A1 (en) * 2007-03-13 2008-09-18 Stephen Ferris Continuous feed cement mixer
US20120097048A1 (en) * 2009-09-02 2012-04-26 Stefano Tomatis Curd kneading apparatus for production of pasta-filata cheese
CN102784711A (zh) * 2012-08-05 2012-11-21 李金泉 洗矿擦洗分级机
CN106268509A (zh) * 2016-08-05 2017-01-04 佛山科学技术学院 一种陶瓷原料干粉末抛粉喷雾造粒装置
CN106268509B (zh) * 2016-08-05 2019-02-26 佛山科学技术学院 一种陶瓷原料干粉末抛粉喷雾造粒装置
CN107138385A (zh) * 2017-05-12 2017-09-08 刘春燕 一种桥梁护栏浇注用砂子高效过筛装置

Also Published As

Publication number Publication date
IT1005172B (it) 1976-08-20
NL7214934A (ja) 1974-05-07
JPS4995257A (ja) 1974-09-10
GB1455297A (en) 1976-11-10
DE2354627A1 (de) 1974-05-16
SE394616B (sv) 1977-07-04
FR2205357B1 (ja) 1978-02-10
FR2205357A1 (ja) 1974-05-31

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Legal Events

Date Code Title Description
AS Assignment

Owner name: IJMI B.V., HOOFDWEG 1278, NIEUW-VENNEP, THE NETHER

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:EXPERT N.V.;REEL/FRAME:005556/0055

Effective date: 19901017