US3666240A - Gravity mixer - Google Patents

Gravity mixer Download PDF

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Publication number
US3666240A
US3666240A US820266A US3666240DA US3666240A US 3666240 A US3666240 A US 3666240A US 820266 A US820266 A US 820266A US 3666240D A US3666240D A US 3666240DA US 3666240 A US3666240 A US 3666240A
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US
United States
Prior art keywords
mixer
drum
mixing
chambers
plates
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
US820266A
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English (en)
Inventor
Wilheim Lodige
Fritz Lodige
Joseph Lucke
Karlheinz Luke
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
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Publication of US3666240A publication Critical patent/US3666240A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/715—Feeding the components in several steps, e.g. successive steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/71705—Feed mechanisms characterised by the means for feeding the components to the mixer using belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/7173—Feed mechanisms characterised by the means for feeding the components to the mixer using gravity, e.g. from a hopper
    • B01F35/71731—Feed mechanisms characterised by the means for feeding the components to the mixer using gravity, e.g. from a hopper using a hopper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/75—Discharge mechanisms
    • B01F35/754—Discharge mechanisms characterised by the means for discharging the components from the mixer
    • B01F35/75415—Discharge mechanisms characterised by the means for discharging the components from the mixer using gravity
    • 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

Definitions

  • a gravity mixing machine for free-flowing products 1n WhlCh a 259/81 165/109 89 mixing drum is arranged inclined to the horizontal and rotata- 5 6 R f d ble about its longitudinal axis and into which the material is in- 1 e erences e troduced at its higher end and discharged at its lower end.
  • the UNITED STATES PATENTS drum is divided into a plurality of successive mixing chambers by the provision of radially extending plates.
  • a gravity mixer for free-flowing materials comprising:
  • a longitudinally extending mixing drum rotatable about a longitudinal axis inclined to the horizontal, and having an upper end, a lower end, and a drum wall running between said upper end and said lower end,
  • the mixing chambers communicate with one another in such a way that the material to be mixed is delivered gradually from the first, uppermost mixing chamber through each of the following lower mixing chambers to the outlet situated at the lower end and at the same time undergoes constant gentle mixing.
  • the mixer is a gravity mixer which does not contain any moving mixing tools and which unlike conventional gravity mixers does not function as a batch mixer, but only as a flow or continuous mixer. It is advantageously provided with a cylindrical drum which has a feed opening in one of its end walls and a discharge opening or outlet in the other.
  • the mixing vessel is preferably inclined at an angle of from to 25 to the horizontal. It is designed to rotate at such a speed that the material being mixed is not subjected to any centrifugal forces of sufficient magnitude to impede the downward trickling of the material being mixed.
  • a drum with an internal diameter of 400 cm is advantageously driven at 10 to 30 r.p.m.
  • the required intensive mixing effect is achieved by dividing up the drum with circular plates whose outer diameter corresponds to the internal diameter of the mixing vessel.
  • the plates must have an external shape which corresponds to the shape of the vessel.
  • the internal diameter of the circular plate is to between 50 percent and 80 percent of the drum diameter, depending upon the free-flow properties of the material to be mixed and the required throughput rate of the product.
  • the segments are advantageously distributed over the entire length of the mixing vessel at intervals of from to 40 percent of the drum diameter.
  • the material to be mixed is kept continuously tumbling, trickling and flowing in each of the mixing chambers, a movement similar to that which occurs in conventional tumbling-barrel mixers. Due to the inclined arrangement of the mixing vessel and the continuous delivery of the material for mixing, the material in each mixing chambers merges with the material in a following lower mixing chamber and, together with the material already being mixed in that lower chamber immediately participates again in the tumbling, trickling and flowing movement.
  • the greater the extent to which the mixing vessel is filled and the more steeply it is inclined the larger the quantity of material flowing over in this way and the longer the flow path will be, i.e. some material can even merge into the next but one mixing chamber or even into the one after that.
  • each mixing chamber can be provided with a lifting or entraining plate advantageously of the same width and height as the chamber.
  • this entraining plate reaches the slope angle of the material being mixed, most of the heavier material still in front of the plate is displaced into the adjacent mixing chamber and some into the chamber after that, where it immediately participates in the mixing movement together with the material already present there.
  • these plates ensure that even the last remaining fractions of the mixed material leave the mixer quickly through the outlet opening.
  • the mixing drum advantageously has a length equal to at least 4 times its diameter so that a number of small mixing chambers can be formed.
  • the various components of the material to be mixed are continuously delivered, it is possible to satisfy even the most stringent requirements in regard to the thoroughness of the mixing. Even in cases where the materials to be mixed are delivered at timed intervals, adequate mixing results can be obtained even when the intervals are short.
  • the mixer is also eminently suitable for cooling or heating mixing stock. To this end, it is provided with a double jacket with inflow and outflow facilities, for example in the form of bores in the shaft and in spokes which support the drum of the mixing vessel.
  • cooling and heating are much more intensive in this mixer because this mixer is comparable with a radiator in so far as, in addition to the wall of the mixing vessel, the plates incorporated to divide the mixing vessel into small mixing chambers and the entraining plates in the mixing chambers also communicates the temperature of the cooling or heating medium to the material being mixed. In addition, there are no moving mixing tools to counteract cooling through friction with the material being mixed.
  • FIG. 1 is a schematic vertical longitudinal section through the mixer as a whole.
  • FIG. 2 is a schematic cross-section of the mixing vessel on the line lIIl of FIG. 1, and
  • FIG. 3 is a schematic cross-section of the mixing vessel on the line III-lll of FIG. 1.
  • the mixer comprises a cylindrical drum mixing vessel 1 which at both ends is mounted on a shaft 2 by way of spokes 3.
  • the shaft 2 is rotatably mounted inclined to the horizontal in bearings 4 in such a way that it cannot be axially displaced.
  • the bearings 4 are in turn mounted in supports 5 and 5a situated at different levels.
  • the mixing vessel 1 is divided up into several small mixing chambers 7 by circular sheet-metal plates 6 which also serve as head pieces. From the inlet to the outlet the successive mixing chambers are situated progressively lower corresponding to the inclination of the drum so that providing the vessel is adequately filled the material to be mixed flows over from one mixing chamber to the next.
  • an entraining plate 8 which, each time the mixing vessel 1 completes a revolution, takes with it even relatively heavy particles of the material being mixed and transfers them to the next mixing chamber.
  • the plates also provide for the complete emptying of the mixing vessel at the end of mixing. In the embodiment shown in FIGS. 1 to 3, the plates 8 in successive chambers 7 are angularly displaced from one another by 90.
  • the shaft 2 is driven by a geared motor 9 through a chain drive 10 at a speed which does not produce a centrifugal force sufficient to interfere in any way with the free fall of the material being mixed.
  • An endless conveyor belt 11 is arranged above the mixer for loading it. Above the conveyor belt there are metering units K to P for the various components to be mixed which are preferably delivered continuously.
  • the material falls off the conveyor belt 11 in the direction of arrows 11a and 11b through a hopper 12 which projects into the first mixing chamber of the mixing vessel 1 through a cover plate 13 fixed to the support 5.
  • a discharge funnel 14 is fixed to the support 50 so that the process of mixing can take place in the absence of any dust provided slip ring seals (not shown) are arranged between the cover plate 13 and discharge funnel 14 on the one hand and the rotating mixing vessel 1 on the other hand.
  • the wavy line 16 in FIG. 3 represents the surface of material being mixed trickling or sliding down at a certain angle with the mixing vessel 1 in rotation.
  • the line 16a in FIG. 1 with the arrows 16b pointing downwards denotes the material continuously flowing over from one mixing chamber to the next in the axial direction.
  • the material to be mixed does not move in bulk although it is continuously lifted by the rotating mixing vessel 1 in a kind of tumbling movement up to a reversing point 17a.
  • the material to be mixed trickles downwards in the vicinity of the arrows 18 along and below the wavy line 16, as in free fall, at the same time in a stream of mixed material moving in the direction of the line 16a and the arrows 1617 which is continuously subjected to a kind of rolling motion.
  • the arrows 18 in FIG. 1 indicate that some of the material trickling or falling down from the reversing point 17a remains in the same mixing chamber while some flows into the next mixing chamber and even into the one after that, together with the stream of mixed material flowing towards the outlet end of the mixing vessel 1.
  • the mixing vessel 1 is provided with a double wall jacket 19 in the embodiment shown.
  • the ends 2a and 2b of the shaft 2 and the spokes 3 are made hollow.
  • the temperature of the heating or cooling medium is communicated to the feed stock not only by the wall of the mixing vessel 1 but also by the circular plates 6 and the entraining plates 8.
  • a gravity mixer for free-flowing materials comprising:
  • a longitudinally extending mixing drum rotatable about an inclined longitudinal axis inclined to the horizontal, and having an upper end, a lower end, and a drum wall running between said upper end and said lower end;
  • nular plates having a central aperture therein and disposed in the drum in such a way as to divide the drum into a plurality of successive intercommunicating chambers, said chambers being adapted for said material to flow successively through each of said chambers to the lower end of the drum;
  • each chamber radially inwardly projecting from the drum wall a distance no greater than the radial distance from the drum wall to the aperture and extending between successive chamberforming plates, the entraining plates in successive chambers being angularly displaced;
  • a mixer as claimed in claim 1 comprising a driven shaft inclined at an angle of from 10 to 25, for supporting and rotating the mixer.
  • a mixer as claimed in claim 4 comprising radial spokes extending from the driven shaft and supporting the wall of the drum.
  • a mixer as claimed in claim I further comprising a double wall jacket surrounding the mixing drum for accommodating a cooling or heating medium.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Accessories For Mixers (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
US820266A 1968-05-14 1969-04-29 Gravity mixer Expired - Lifetime US3666240A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1757478A DE1757478C3 (de) 1968-05-14 1968-05-14 Freifall-Mischvorrichtung

Publications (1)

Publication Number Publication Date
US3666240A true US3666240A (en) 1972-05-30

Family

ID=5694543

Family Applications (1)

Application Number Title Priority Date Filing Date
US820266A Expired - Lifetime US3666240A (en) 1968-05-14 1969-04-29 Gravity mixer

Country Status (6)

Country Link
US (1) US3666240A (enrdf_load_stackoverflow)
DE (1) DE1757478C3 (enrdf_load_stackoverflow)
ES (1) ES366747A1 (enrdf_load_stackoverflow)
FR (1) FR2008446A1 (enrdf_load_stackoverflow)
GB (1) GB1258774A (enrdf_load_stackoverflow)
NL (1) NL6906738A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4244656A (en) * 1978-11-29 1981-01-13 Rtl Contactor Holding S.A. Apparatus for contacting liquids and solids with liquids
US5407809A (en) * 1993-06-07 1995-04-18 Bedminster Bioconversion Corporation Digester for converting organic material into compost
US20020006075A1 (en) * 2000-03-29 2002-01-17 Asphalt Equipoment & Service Company Washington Corporation Tireless rotary mixer
US6516638B1 (en) * 1998-01-09 2003-02-11 Monotub Plc Washing machine
CN109224981A (zh) * 2018-11-09 2019-01-18 景德镇陶瓷大学 一种陶瓷粉体旋转流场式连续混料设备

Families Citing this family (3)

* 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
NL1023104C2 (nl) * 2003-04-04 2004-10-26 Logitec Plus B V Menginrichting.
CN112999956B (zh) * 2021-04-22 2022-01-18 广东美赛尔细胞生物科技有限公司 一种用于妊娠纹修复的乳霜及其制备方法

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1056974A (en) * 1912-08-05 1913-03-25 Thomas J Conway Mixing cylinder or drum for concrete-mixers.
GB372046A (en) * 1931-03-26 1932-05-05 Ritter Paul Improvements in or relating to mixing devices
US2310603A (en) * 1942-05-21 1943-02-09 Vilter Mfg Co Sand cooler
GB556942A (en) * 1941-04-24 1943-10-28 British Celanese Improvements in or relating to the liquid treatment of solid materials
US2582365A (en) * 1948-05-19 1952-01-15 Rexford Paper Company Drier roll
US2660408A (en) * 1945-03-27 1953-11-24 John E Laschinger Heat exchanger for continuous treatment of fluent material
US2920344A (en) * 1958-09-10 1960-01-12 Koppers Co Inc Balling drum
FR1227872A (fr) * 1958-06-28 1960-08-24 Appareil pour distribuer et mélanger automatiquement des matières de natures différentes et décharger le mélange
FR1300065A (fr) * 1961-09-13 1962-07-27 Dispositif pour mélanger des produits poudreux ou granuleux ayant un poids spécifique différent
US3216345A (en) * 1962-04-09 1965-11-09 Canadian Breweries Ltd Continuous preparation of brewers' mash
US3355817A (en) * 1964-08-13 1967-12-05 Agfa Gevaert Ag Sealing means for rotary drum heat exchanger

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1056974A (en) * 1912-08-05 1913-03-25 Thomas J Conway Mixing cylinder or drum for concrete-mixers.
GB372046A (en) * 1931-03-26 1932-05-05 Ritter Paul Improvements in or relating to mixing devices
GB556942A (en) * 1941-04-24 1943-10-28 British Celanese Improvements in or relating to the liquid treatment of solid materials
US2310603A (en) * 1942-05-21 1943-02-09 Vilter Mfg Co Sand cooler
US2660408A (en) * 1945-03-27 1953-11-24 John E Laschinger Heat exchanger for continuous treatment of fluent material
US2582365A (en) * 1948-05-19 1952-01-15 Rexford Paper Company Drier roll
FR1227872A (fr) * 1958-06-28 1960-08-24 Appareil pour distribuer et mélanger automatiquement des matières de natures différentes et décharger le mélange
US2920344A (en) * 1958-09-10 1960-01-12 Koppers Co Inc Balling drum
FR1300065A (fr) * 1961-09-13 1962-07-27 Dispositif pour mélanger des produits poudreux ou granuleux ayant un poids spécifique différent
US3216345A (en) * 1962-04-09 1965-11-09 Canadian Breweries Ltd Continuous preparation of brewers' mash
US3355817A (en) * 1964-08-13 1967-12-05 Agfa Gevaert Ag Sealing means for rotary drum heat exchanger

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4244656A (en) * 1978-11-29 1981-01-13 Rtl Contactor Holding S.A. Apparatus for contacting liquids and solids with liquids
US5407809A (en) * 1993-06-07 1995-04-18 Bedminster Bioconversion Corporation Digester for converting organic material into compost
US6516638B1 (en) * 1998-01-09 2003-02-11 Monotub Plc Washing machine
US20020006075A1 (en) * 2000-03-29 2002-01-17 Asphalt Equipoment & Service Company Washington Corporation Tireless rotary mixer
CN109224981A (zh) * 2018-11-09 2019-01-18 景德镇陶瓷大学 一种陶瓷粉体旋转流场式连续混料设备

Also Published As

Publication number Publication date
ES366747A1 (es) 1971-03-16
NL6906738A (enrdf_load_stackoverflow) 1969-11-18
DE1757478C3 (de) 1979-06-07
DE1757478B2 (de) 1978-10-05
FR2008446A1 (enrdf_load_stackoverflow) 1970-01-23
GB1258774A (enrdf_load_stackoverflow) 1971-12-30
DE1757478A1 (de) 1971-04-22

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