EP0363484A1 - Procede et installation de melange de poudres - Google Patents

Procede et installation de melange de poudres

Info

Publication number
EP0363484A1
EP0363484A1 EP88904634A EP88904634A EP0363484A1 EP 0363484 A1 EP0363484 A1 EP 0363484A1 EP 88904634 A EP88904634 A EP 88904634A EP 88904634 A EP88904634 A EP 88904634A EP 0363484 A1 EP0363484 A1 EP 0363484A1
Authority
EP
European Patent Office
Prior art keywords
powders
container
powder
air
gas
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.)
Pending
Application number
EP88904634A
Other languages
German (de)
English (en)
Inventor
Masafumi Matsunaga
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.)
Nordson Corp
Original Assignee
Nordson Corp
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
Priority claimed from JP62134579A external-priority patent/JPH0773667B2/ja
Priority claimed from JP62281913A external-priority patent/JPH01123620A/ja
Priority claimed from JP28191487A external-priority patent/JPH0798140B2/ja
Application filed by Nordson Corp filed Critical Nordson Corp
Publication of EP0363484A1 publication Critical patent/EP0363484A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/30—Mixing gases with solids
    • B01F23/32—Mixing gases with solids by introducing solids in gas volumes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
    • B01F25/23—Mixing by intersecting jets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
    • B01F25/25—Mixing by jets impinging against collision plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/40—Mixers using gas or liquid agitation, e.g. with air supply tubes
    • B01F33/404—Mixers using gas or liquid agitation, e.g. with air supply tubes for mixing material moving continuously therethrough, e.g. using impinging jets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/60—Mixing solids with solids

Definitions

  • the conventional powder mixing method may be divided broadly into the following two types.
  • One is a method of mixing powders by rotating a rotary blade in a container (such as a ribbon blender method), and the other is a method of mixing powders by rotating a container itself and moving the powders therein up and down from gravity (such as a rotary mixer method).
  • Both of these are a method of mechanically mixing powders. Accordingly, when the mixing ratio is a minute value or when microscopic dispersion is required, they could not always be said to be sufficient.
  • the volume of the container has been relatively great and the mixing time has been relatively long and further, the batch system has often been adopted and accordingly, the number of working steps has been great, and this has particularly formed a serious bottleneck in the flow line.
  • the above-described method and apparatus of the present invention are further characterized in that said different kinds of powders are inter ⁇ mittently sprayed from the air spray nozzles in conformity with a desired mixing ratio to thereby adjust the mixing ratio of the powders.
  • Figure 5 is a perspective view showing the elongate conical shape of the spray pattern.
  • Figure 10 is a side view of a second modifica ⁇ tion.
  • Figure 12 is a side view of the apparatus of the second embodiment.
  • Figure 16 illustrates a method of impacting the air spray laterally.
  • Figure 19 is a side cross-sectional view of the structure of the apparatus of the third embodiment.
  • Figure 20 is a side cross-sectional view of an apparatus in which the powder ejector nozzle faces upward.
  • Figure 21 is a side cross-sectional view of an apparatus in which the powder ejector nozzle faces laterally.
  • the mixture of the thus obtained atomized powders is drawn out of the hopper-like container 1, and gases and powders are separated from each other by a separate gas-powder separating apparatus, whereby mixed powders are obtained.
  • a third spray pattern i.e., a fan-like spray pattern
  • the cross-section in the head portion is like a convex lens, and when such patterns collide against each other, the diffused stream is divided into two leftward and rightward directions .
  • the diffused stream is divided not only into the leftward and rightward directions, but also into the upward and downward directions.
  • a half-hermetically sealed type hopper-like container 21 has an openable-closable lid 22 on the upper surface thereof and has a funnel-like lower portion which terminates in a discharge port 23.
  • Two air spray guns 26A and 26B are provided on the peripheral side wall of said container in opposed relationship with each other, and air spray nozzles 25A and 25B are mounted on these guns so that the extensions thereof intersect each other at a point in the central portion of the container 21.
  • the pressurized gas CA adjusted to the necessary pressure and flow rate is supplied from the pressurized gas generating device 32 via the respective control devices 31A and 3IB and through gas supply pipes 30A and 30B into the air ejectors 28A and 28B. Then, at the outlets of the air injection holes 29A and 29B thereof, the powder supplied to around then is sucked and entrained in gas and is injected from the spray nozzles 25A and 25B mounted at the ends thereof. Those sprays As and Bs concentrate on the central portion and collide against each other.
  • any of these kinds is appropriately selected with the conditions of mixing, i.e., the properties of the particles of the powder, such as, for example, the specific gravity, size, shape and mixing ratio of the particles, the speed of the injected stream and the amount of injec- tion.
  • the state of collision of the spray patterns Cs, Ds, Es, ... in a case where there are provided three or more air spray nozzles is such that as shown in the plan views of Figures 2 and 3, the spray patterns concentratedly collide against one another at the central portion of the hopper-like container 5 (or 11), whereby mixing action takes place similar to the case where two air spray nozzles are provided.
  • the gist of a second embodiment of the present invention resides in a method and an apparatus wherein when air-spraying plural kinds of powders in a half-hermetically sealed type container by respective powder ejectors, the amount of air to be supplied to them is supplied in a pulse ⁇ like fashion, namely, intermittently, substantially in conformity with the mixing ratio of the powders, whereby those powders are intermittently sprayed with the air and they are caused to collide against each other and the mixed powders now in the form of atomized bodies are directed to a gas-powder separating device outside the container and are separated from gas, thereby obtaining a mixture of the powders .
  • the simplest means for supplying the air intermittently as described above is to use electrical pulse signals.
  • the use of a commercially available pulse controller 106 and solenoid type air values 105A, 105B, ... would enable the cycle and intermittence time of those pulse signals to be easily changed at the unit of millisecond.
  • a minute mixing ratio can also be set by selecting and setting the numerical values of these pulse signals.
  • the atomized bodies of the powders sprayed and mixed at a predetermined mixing ratio in the manner described above are forced to the lower portion in the half-hermetically sealed type funnel-like container 101 and at the same time, are drawn outwardly by negative pressure applied to the same portion, and are directed into a gas- powder separating device 108 which is the generating source of the negative pressure, and are separated from gas , whereby there is obtained a mixture AB of the powders .
  • Pressurized air pipes 120A, 120B, ... to the powder ejectors 113A, 113B, ... ⁇ are connected to a pressurized air generating device 125 through air flow rate regulating valves 124A, 124B, ... respectively, and air-operated type air valves 121A, 12IB, are provided on the inter ⁇ mediate portions of the pipes 120A, 120B, ....
  • a solenoid type air valve is provided instead of the air-operated type air valve, but actually the pressure of the pressurized air is relatively high and therefore, it seems that in more cases, the air-operated type air valve is used.
  • a straight pipe lllp in the lower portion 111b of the funnel-like container 111 is connected to a gas-powder separating device 150 by a pipe 145, and a gas suction device 157 is provided in the device 150.
  • a bag filter type device is shown as the gas-powder separating device.
  • a collection container 159 for the mixture of powders is placed below the gas-powder separating device 150.
  • the operation of the apparatus of the second embodiment will now be described. Reference is also had to Figure 12.
  • the powder supply hoppers 118A, 118B, ... of the powder ejectors 113A, 113B, ... are replenished with different kinds of powders A, B, ..., respectively.
  • Set pulse signals are then transmitted from the pulse controller 140.
  • those pulse signals are of three kinds for the powders A, B and C.
  • the cycles of the pulse signals are the same, e.g.
  • 5 times i.e., 40 ms and 10 ms .
  • the set times of the pulses there is one of the unit of millisecond depending on the pulse controller. In that case, no setting can be made for a time below the decimal point and therefore, it may
  • the atomized bodies thus mixed are forced downwardly through the funnel-like container 111 by the succeeding air sprays and at the same time, the negative pressure by the intake device 157 of the gas-powder separating device 150 is applied to the lower portion of the container 111 and therefore, these mixed atomized bodies are drawn out of the container 111.
  • the atomized bodies are then directed through the gas-powder separating device 150, whereby there is obtained a mixture ABC- of the powders .
  • the shape of the spray patterns of the powders is generally conical, but various shapes are possible as in the first embodiment.
  • the air-operated type air valves may be eliminated on the intermediate portions of the pressurized air pipes to the powder ejectors and instead, solenoid type air valves may be provided and electrically connected to the pulse controller. In such case, the volume of the pressurized air is relatively small and solenoid type air valves of small capacity will be sufficiently suitable.
  • plural kinds of powders are easily set and adjusted even at a mixing ratio of minute numerical value, and they are uniformly disposed within a shorter time to thereby easily obtain a mixture of the powders .
  • a third embodiment will now be described. It is such that powders are sprayed and the spray streams thereof are impacted against a planar surface and by the resultant colliding stream and disturbed stream, the powders in the gas are widely dispersed and uniformly mixed with one another.
  • the repletion density (the volume specific gravity) of powder in atomized bodies is very small and is super-low density, say, one several thousandths to one several tens of thousandths of that of the powder ' in a container used in the conventional mechanical mixing. Under such a condition in which the dispersion intervals between the particles are very great, the particles go back and forth and therefore, these different kinds of particles readily come into one another, that is, mingle with one another, whereby uniform dispersion is accomplished easily and within a short time.
  • the atomized bodies PABC- comprising particles finely and uniformly mixed in this manner are forced downward to the lower portion of the container 201 by the succeeding air sprays and reach the straight tubular portion 205 thereof.
  • the atomized bodies are then drawn out of the portion 205, and are directed to the gas-powder separating device at the next step, whereby uniformly mixed powders PABC, are obtained.
  • the sprays of the powders have been downwardly and perpendicularly impacted against the collision plate, there are available other several methods of impacting the sprays, which will be mentioned below.
  • This method comprises making the direction of the spray stream PS-, of the powders lateral and impacting it against a collision plate 208 perpendicularly thereto.
  • the reflected stream PSo 0 thereof flies laterally and a disturbed stream PS q results therefrom and flows downward.
  • a large disturbed stream is produced in the upper portion of the reflected stream PS adhere, while the disturbed stream in the lower portion is small as compared with that in the upper portion and there ⁇ fore, there is a fear that a difference may occur between the degrees of dispersion in the upper and lower portions.
  • This method comprises making the direction of the spray stream PS,- of the powders obliquely upward and impacting it against a collision plate 211 perpendicularly thereto.
  • the resultant reflected stream PS- jumps back obliquely downward and impinges on the inner wall of the container, whereby a disturbed stream PS.- is produced.
  • this method like the above-described method, is not free from the fear that some difference may occur between the degrees of dispersion in the upper and lower portions.
  • This method comprises making the direction of the spray stream PS, . of the powders obliquely downward and impacting it against a collision plate 214 perpen- dicularly thereto.
  • This method is not free from the fear that a difference may occur between the degrees of dispersion in the upper and lower portions.
  • a powder ejector 223 is provided in the upper portion of a half-hermetically sealed type funnel-like con ⁇ tainer 221, a nozzle 224 for the powder ejector is provided downwardly in the container 221, an air injection port 225 is provided above the outside thereof, and the bottom 226B of a hopper 226 for the powder ejector is provided around the injection port 225 so as to cover the latter.
  • a supply device from a separate powder combining apparatus is connected to the hopper 226.
  • a planar collision plate 222 is provided perpendicularly to the direction of the nozzle at a certain necessary interval S therefrom.
  • the lower straight tubular portion 227 of the funnel-like container 221 is connected to a gas-powder separating device 231 by a pipe 230.
  • the gas-powder separating device in Figure 19 is shown, for example, as being of the filter bag type.
  • the downwardly facing nozzle 224 for the powder ejector has been shown as the basis of the structure of the above-described apparatus, but the nozzle may face upward, laterally, obliquely upward and obliquely downward as shown in Figures 20, 21, 22 and 23, respectively.
  • a conveyor belt supply system which, serves both to combine the powders and to roughly (preliminarily) mix the powders.
  • a conveyor belt 275 has its downstream end disposed above a powder supply hopper 5 226 on the present apparatus.
  • the discharge ports 264E, 268E and 272E of a plurality of devices for continuously supplying a constant amount of powder are provided at a necessary interval T. It is more desirable that if possible,
  • 15 devices may be mechanical vibration type feeders or rotary feeders of other type.
  • said devices may be ribbon blender type hoppers .
  • said devices may be ribbon blender type hoppers .
  • 25 ejector is mounted at the bottom, i.e., the discharge portion, of the hopper, and is connected by a pipe 299 to a funnel-like container 301 which is the body of the apparatus according to the present invention.
  • the powders to be mixed together are plural kinds of powders combined at the necessary combination ratio and dispersed (roughly mixed) to some extent.
  • the combination of the powders is accomplished by a powder combining device, which may be one of various types from the manually operated type to the fully automatic type.
  • the powders PABC. combined by such powder combining device are supplied.
  • the combined powders PABC. are supplied into the hopper 226 of the powder ejector 223.
  • An amount of air having the necessary air pressure is supplied from the pressurized air generating device through the air pipe 228 to the air injection port 225 provided in the lower central portion of the hopper 226.
  • the powders are dispersed in all directions in the upper portion 27 -
  • the means for supplying the plural kinds o.f powders onto the belt are not restricted to the above-described vibration type feeders, but may be various continuous supply devices such as rotary feeders and the like.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Nozzles (AREA)

Abstract

Dans une enceinte en forme de trémie du type à fermeture partiellement hermétique (1), des poudres de différents types (A, B) sont pulvérisées par une pluralité d'ajutages de pulvérisation pneumatique (2, 3); on provoque une collision entre les configurations de pulvérisation résultantes pour produire une turbulence, de sorte qu'un mélange de gaz et de poudres se forme, le gaz étant ensuite séparé du mélange pour obtenir un mélange des différents types de poudres.
EP88904634A 1987-05-29 1988-05-24 Procede et installation de melange de poudres Pending EP0363484A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP62134579A JPH0773667B2 (ja) 1987-05-29 1987-05-29 粉粒体の混合方法とその装置
JP134579/87 1987-05-29
JP281914/87 1987-11-06
JP281913/87 1987-11-06
JP62281913A JPH01123620A (ja) 1987-11-06 1987-11-06 粉粒体の混合方法とその装置
JP28191487A JPH0798140B2 (ja) 1987-11-06 1987-11-07 粉粒体の混合比率の設定調整方法及びその混合方法とその装置

Publications (1)

Publication Number Publication Date
EP0363484A1 true EP0363484A1 (fr) 1990-04-18

Family

ID=27316914

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88904634A Pending EP0363484A1 (fr) 1987-05-29 1988-05-24 Procede et installation de melange de poudres

Country Status (3)

Country Link
EP (1) EP0363484A1 (fr)
BR (1) BR8807535A (fr)
WO (1) WO1988009208A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6227694B1 (en) 1996-12-27 2001-05-08 Genus Corporation High speed collision reaction method
FR2838067B1 (fr) * 2002-04-04 2005-02-04 Toulouse Inst Nat Polytech Procede de mise en contact de phases notamment gaz/liquide, reacteur dit a impacts multidirectionnels associe, et application au traitement oxydant de l'eau
FR3002744A1 (fr) * 2013-03-04 2014-09-05 Ecoval Environnement Dispositif de melange de materiaux broyes, notamment de materiaux issus de matelas en vue de leur recyclage
CN110026119B (zh) * 2019-04-28 2021-07-23 东莞市洁高新材料科技有限公司 一种喷吹式钝化液混合装置
ES2820148B2 (es) * 2019-10-18 2023-07-28 Chumillas Tech S L Mezclador

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB652011A (en) * 1947-01-02 1951-04-11 Christian Oskar Rasmussen Emulsifying apparatus
US2991187A (en) * 1958-12-05 1961-07-04 Texaco Development Corp Method of and apparatus for concurrently disintegrating and mixing together different solid particles
FR1459378A (fr) * 1965-10-21 1966-04-29 Kawasaki Heavy Ind Ltd Système spécial à jet pulsant pour mélangeur pneumatique
DE2146047A1 (de) * 1971-09-15 1973-03-22 Jung Gmbh Lokomotivfab Arn Verfahren und anordnung zum mischen verschiedener gueter
JPS59136125A (ja) * 1983-01-27 1984-08-04 Hiroyuki Fukuya 落下積層式粉粒体連続混合方法
JPS61209032A (ja) * 1985-03-12 1986-09-17 Res Dev Corp Of Japan 超微粒子の混合法並に装置
JPH0638028A (ja) * 1992-07-21 1994-02-10 Fuji Xerox Co Ltd 画像読取装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8809208A1 *

Also Published As

Publication number Publication date
BR8807535A (pt) 1990-05-22
WO1988009208A1 (fr) 1988-12-01

Similar Documents

Publication Publication Date Title
US4191480A (en) Continuous flow static mixer for mixing powder and/or suspension materials with liquid materials
CA1145328A (fr) Dispositif et methode pour incorporer des constituants liquides a des materiaux pulverlents ou granulaires pouvant etre deverses
US4390284A (en) Method and apparatus for wetting powder
US4430001A (en) Injector mixer apparatus
KR19990029604A (ko) 입자조성방법과 그에 사용하는 입자조성기
PL174324B1 (pl) Sposób i urządzenie do zwilżania cząsteczkowego materiału
US4573801A (en) Apparatus for producing a gas solid two phase flow jet having a constant mass or volume flow rate and predetermined velocity
EP0363484A1 (fr) Procede et installation de melange de poudres
US3871623A (en) Apparatus for mixing materials
US6660215B2 (en) Plant for producing a web-shaped product of fibers and powder
US4168914A (en) Method and apparatus for blending fine and cohesive powders in a fluidized bed with gas injection through ball valves
JPS59183855A (ja) 被覆のため基体上に粉体製品を均一に分配する方法および装置
AU1783788A (en) Powder mixing method and apparatus
US3814386A (en) Method for vibratory blending of fluid particulate materials
CA2000984A1 (fr) Malaxeur de sable bitumineux
CA1211350A (fr) Distributeur permettant de realiser un assemblage de copeaux de bois alignes
JPS6141707A (ja) 粉末金属製造装置
JPH05234A (ja) 液体中に粉体を混合する装置
JPH01123620A (ja) 粉粒体の混合方法とその装置
US4406410A (en) Method and apparatus for adding and mixing second cohesive powders in a fluidized bed blender
JPH0773667B2 (ja) 粉粒体の混合方法とその装置
US3434698A (en) Fluid mixing,moving and atomizing methods and apparatus
US20040159587A1 (en) Apparatus and method for separating/mixing particles/fluids
JPH01310729A (ja) 粉粒体の混合比率の設定調整方法及びその混合方法とその装置
EP0790857A1 (fr) Moyen pour melanger une poudre avec un liquide pour former une boue epaisse

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 19890926

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE