EP0112619B1 - Apparatus for the production of mixture, dispersions and the like - Google Patents

Apparatus for the production of mixture, dispersions and the like Download PDF

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Publication number
EP0112619B1
EP0112619B1 EP83306427A EP83306427A EP0112619B1 EP 0112619 B1 EP0112619 B1 EP 0112619B1 EP 83306427 A EP83306427 A EP 83306427A EP 83306427 A EP83306427 A EP 83306427A EP 0112619 B1 EP0112619 B1 EP 0112619B1
Authority
EP
European Patent Office
Prior art keywords
agitator
noise
vessel
mixing apparatus
blades
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
Application number
EP83306427A
Other languages
German (de)
French (fr)
Other versions
EP0112619A3 (en
EP0112619A2 (en
Inventor
Robert William English
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.)
Netzsch Mastermix Ltd
Original Assignee
Netzsch Mastermix Ltd
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 Netzsch Mastermix Ltd filed Critical Netzsch Mastermix Ltd
Priority to AT83306427T priority Critical patent/ATE34927T1/en
Publication of EP0112619A2 publication Critical patent/EP0112619A2/en
Publication of EP0112619A3 publication Critical patent/EP0112619A3/en
Application granted granted Critical
Publication of EP0112619B1 publication Critical patent/EP0112619B1/en
Expired 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
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/56—Mixing liquids with solids by introducing solids in liquids, e.g. dispersing or dissolving
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/805—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis wherein the stirrers or the receptacles are moved in order to bring them into operative position; Means for fixing the receptacle
    • 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
    • B01F35/20—Measuring; Control or regulation
    • B01F35/21—Measuring
    • B01F35/213—Measuring of the properties of the mixtures, e.g. temperature, density or colour
    • 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
    • B01F35/20—Measuring; Control or regulation
    • B01F35/22—Control or regulation
    • B01F35/221—Control or regulation of operational parameters, e.g. level of material in the mixer, temperature or pressure
    • B01F35/2214—Speed during the operation
    • B01F35/22142—Speed of the mixing device during the operation
    • B01F35/221422—Speed of rotation of the mixing axis, stirrer or receptacle during the operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/30—Mixing paints or paint ingredients, e.g. pigments, dyes, colours, lacquers or enamel

Definitions

  • Known apparatus e.g. for making paint, comprises a vessel for receiving liquid and other material to be mixed and a rotary agitator for immersion into the contents of the vessel.
  • the other materials may comprise opacifiers, pigments and the like, and are often added in successive increments.
  • the size of an increment is determined by the state of the liquid to which the increment is added, and the desire to avoid clots and lumps in the mixture. In general, it is better to add successive small increments than fewer larger increments.
  • EP-A-0000827 describes apparatus of the mentioned kind in which the agitator is vertically moved in the vessel under the control of means responsive to the noise level emitted by the contents of the vessel during agitation. Effectively, the addition of a powder increment, although having a blanketing effect, causes increased turbulence and hence more noise and this noise is sensed and a resulting signal causes the agitatorto be raised so as to be nearer the surface of the liquid. In this position the agitator has a greater effect on mixing and dispersing of the powder (assumed to be located towards the surface of the liquid) and consequently the speed and efficiency of the dispersion is improved.
  • the apparatus is made in various sizes, for example a nominal 500 litre, 2500 litre and so on vessel capacity. If a large vessel is used for a small batch for example a 400 litre batch in a 2500 litre vessel as is sometimes necessary because of the unavailability of smaller apparatus, pool of liquid is shallow and the scope for raising and lowering of the agitator is quite limited because the agitator must be immersed in the solvent.
  • the apparatus of said European Patent is then of only limited value or even is not useful.
  • the object of the invention is to provide improvements.
  • mixing apparatus comprising a vessel for receiving liquid and other materials to be mixed, a rotary agitator for immersion into the contents of the vessel, and means responsive to the noise level emitted by the contents of the vessel during agitation, is characterised in that the said means responsive to the noise level are used to vary the effectiveness of the agitator other than by height adjustment.
  • a pot 10 is charged with powder and solvents which are mixed and dispersed by rotor 12 driven by shaft 14.
  • the shaft can be raised and lowered by ram 16 and the shaft is rotated by a motor in the head 18.
  • Microphone 20 senses noise which is used by approximate circuitry to vary the mixing conditions from time to time.
  • the agitator may be rotated by a variable speed drive (known per se) with the noise responsive means varying the speed of rotation of the agitator.
  • a variable speed drive known per se
  • noise responsive means varying the speed of rotation of the agitator.
  • variable speed drive is in GB-A-1051692 where a variable volume pump is used in a hydraulic transmission.
  • the noise signal from microphone 20 will be used to control the swash plate angle of the variable volume pump which drives the motor in head 18.
  • the rotary agitator may be provided with blades of variable pitch, with the pitch being adjusted by the noise responsive means.
  • the effect will be similar to that attained by agitator speed variation, in that an increase in pitch will increase the agitation of the liquid for better mixing, and a reduction in pitch, that is movement towards a fully “feathered” position will have the opposite effect, and threshold limits avoid hunting.
  • the blades of the agitator 12 may be pivoted on a hub at the bottom of the agitator shaft 14 for movement between the feathered and effective positions, and be spring urged to one or other.
  • a loose collar or tubular shaft surrounding the drive shaft 14 may be axially displaced by an actuator in head 18 operated by the noise control system so as to cam the blades against the spring to the opposite position.
  • the agitator may be provided with blades which are adjustable between positions more and less closely akin to radial positions. Effectively the overall diameter of the agitator is varied by such adjustment, and hence a decrease in noise due to powder addition will result in an increase in agitator diameter and vice versa, with thresholds for the same reasons as would be the case if either of the alternative features were utilised.
  • This possibility may be utilised by again having inner and outer shafts 14 with one driving (rotating) the agitator blades 12 and the second moved relatively to the first, such as by an epicyclic gear set via a noise sensing system to cam the blades to different angles, between the radial and the tangential to the shafts, so that the blades sweep through different diameter circles according to the angular position of the blades to the shafts.
  • the mixing effect is greatest, akin to maximum pitch displacement from the feathered position, likewise akin to maximum speed of the drive shaft 14, or to maximum effective height of the agitator in the pot in the various respective other possibilities mentioned.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Silicon Compounds (AREA)
  • Coating Apparatus (AREA)

Abstract

Paint making apparatus comprises a rotor for dispersing powder into solvent, a microphone for sensing noise generated by the dispersing operation, and various different (alternative or in combination) means for making the rotor more and less effective according to the noise level and based on turbulence as a result of unmixed powder being present, as compared with the conditions when the powder is fully dispersed.

Description

  • Known apparatus e.g. for making paint, comprises a vessel for receiving liquid and other material to be mixed and a rotary agitator for immersion into the contents of the vessel. The other materials may comprise opacifiers, pigments and the like, and are often added in successive increments. The size of an increment is determined by the state of the liquid to which the increment is added, and the desire to avoid clots and lumps in the mixture. In general, it is better to add successive small increments than fewer larger increments.
  • EP-A-0000827 describes apparatus of the mentioned kind in which the agitator is vertically moved in the vessel under the control of means responsive to the noise level emitted by the contents of the vessel during agitation. Effectively, the addition of a powder increment, although having a blanketing effect, causes increased turbulence and hence more noise and this noise is sensed and a resulting signal causes the agitatorto be raised so as to be nearer the surface of the liquid. In this position the agitator has a greater effect on mixing and dispersing of the powder (assumed to be located towards the surface of the liquid) and consequently the speed and efficiency of the dispersion is improved.
  • The apparatus is made in various sizes, for example a nominal 500 litre, 2500 litre and so on vessel capacity. If a large vessel is used for a small batch for example a 400 litre batch in a 2500 litre vessel as is sometimes necessary because of the unavailability of smaller apparatus, pool of liquid is shallow and the scope for raising and lowering of the agitator is quite limited because the agitator must be immersed in the solvent. The apparatus of said European Patent is then of only limited value or even is not useful.
  • The object of the invention is to provide improvements.
  • In accordance with the invention, mixing apparatus comprising a vessel for receiving liquid and other materials to be mixed, a rotary agitator for immersion into the contents of the vessel, and means responsive to the noise level emitted by the contents of the vessel during agitation, is characterised in that the said means responsive to the noise level are used to vary the effectiveness of the agitator other than by height adjustment.
  • Hence the adjustment based on noise level is used effectively in situations where the apparatus of said EP is useless, although the present invention is in fact useful in other situations also, that is to say, as a substitute for the apparatus of said EP.
  • Various possibilities for carrying out the invention will now be discussed with reference to the accompanying drawing wherein the sole figure is a schematic view of apparatus for making paint. In the drawing a pot 10 is charged with powder and solvents which are mixed and dispersed by rotor 12 driven by shaft 14. The shaft can be raised and lowered by ram 16 and the shaft is rotated by a motor in the head 18. Microphone 20 senses noise which is used by approximate circuitry to vary the mixing conditions from time to time.
  • The agitator may be rotated by a variable speed drive (known per se) with the noise responsive means varying the speed of rotation of the agitator. An increase in turbulence as a result of a powder increment will lead to an increase in rotation speed, and vice versa, but with upper and lower threshold limits between which no variation takes place, in order to avoid unnecessary "hunting".
  • One example of a known variable speed drive is in GB-A-1051692 where a variable volume pump is used in a hydraulic transmission. In applying the present invention to a drive of the kind described in said GB-A-, the noise signal from microphone 20 will be used to control the swash plate angle of the variable volume pump which drives the motor in head 18.
  • The rotary agitator may be provided with blades of variable pitch, with the pitch being adjusted by the noise responsive means. The effect will be similar to that attained by agitator speed variation, in that an increase in pitch will increase the agitation of the liquid for better mixing, and a reduction in pitch, that is movement towards a fully "feathered" position will have the opposite effect, and threshold limits avoid hunting.
  • For example, the blades of the agitator 12 may be pivoted on a hub at the bottom of the agitator shaft 14 for movement between the feathered and effective positions, and be spring urged to one or other. A loose collar or tubular shaft surrounding the drive shaft 14 may be axially displaced by an actuator in head 18 operated by the noise control system so as to cam the blades against the spring to the opposite position.
  • The agitator may be provided with blades which are adjustable between positions more and less closely akin to radial positions. Effectively the overall diameter of the agitator is varied by such adjustment, and hence a decrease in noise due to powder addition will result in an increase in agitator diameter and vice versa, with thresholds for the same reasons as would be the case if either of the alternative features were utilised.
  • This possibility may be utilised by again having inner and outer shafts 14 with one driving (rotating) the agitator blades 12 and the second moved relatively to the first, such as by an epicyclic gear set via a noise sensing system to cam the blades to different angles, between the radial and the tangential to the shafts, so that the blades sweep through different diameter circles according to the angular position of the blades to the shafts. At maximum diameter the mixing effect is greatest, akin to maximum pitch displacement from the feathered position, likewise akin to maximum speed of the drive shaft 14, or to maximum effective height of the agitator in the pot in the various respective other possibilities mentioned.
  • However, it is possible to utilise all of these features in combination, or ones of these features in combination.
  • It is also possible to utilise any of these features or combination of these features, in combination with the vertical adjustment feature.

Claims (4)

1. Mixing apparatus comprising a vessel for receiving liquid and other materials to be mixed, a rotary agitator for immersion into the contents of the vessel, and means responsive to the noise level emitted by the contents of the vessel during agitation, characterised in that the said means responsive to the noise level are used to vary the effectiveness of the agitator other than by height adjustment.
2. Mixing apparatus as claimed in Claim 1 characterised in that the agitator is rotated by a variable speed drive (known per se) and the noise responsive means varies the speed of rotation of the agitator.
3. Mixing apparatus as claimed in Claim 1 characterised in that the rotary agitator is provided with blades of variable pitch arranged to be adjusted by the noise responsive means.
4. Mixing apparatus as claimed in Claim 1 characterised in that the agitator is provided with blades which are adjustable between positions more and less closely akin to radial positions under the control of the noise sensor.
EP83306427A 1982-11-23 1983-10-24 Apparatus for the production of mixture, dispersions and the like Expired EP0112619B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83306427T ATE34927T1 (en) 1982-11-23 1983-10-24 DEVICE FOR THE PREPARATION OF MIXTURES, DISPERSIONS AND LIKE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8233368 1982-11-23
GB8233368 1982-11-23

Publications (3)

Publication Number Publication Date
EP0112619A2 EP0112619A2 (en) 1984-07-04
EP0112619A3 EP0112619A3 (en) 1986-07-30
EP0112619B1 true EP0112619B1 (en) 1988-06-08

Family

ID=10534442

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83306427A Expired EP0112619B1 (en) 1982-11-23 1983-10-24 Apparatus for the production of mixture, dispersions and the like

Country Status (3)

Country Link
EP (1) EP0112619B1 (en)
AT (1) ATE34927T1 (en)
DE (1) DE3376959D1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH669080GA3 (en) * 1987-05-14 1989-02-28
DE19756099A1 (en) 1997-12-17 1999-07-01 Waeschle Gmbh Process for classifying bulk goods
CN108654493A (en) * 2018-07-06 2018-10-16 温州市英可尔油墨有限公司 A kind of safe cage agitating device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3050264A (en) * 1959-07-17 1962-08-21 Vernie W Marcyes Sound actuated control system for ball mill and the like
FR1398561A (en) * 1964-06-12 1965-05-07 Torrance And Sons Ltd Improvements in apparatus for mixing, dispersing or dissolving
DE1607573B2 (en) * 1967-12-01 1972-01-27 Polysius Ag, 4723 Neubeckum Method and device for protecting crushing mills against overload
GB2002246B (en) * 1977-08-12 1982-01-13 Mastermix Eng Co Ltd Apparatus for the production of mixtures dispersions and the like
DE3102661A1 (en) * 1981-01-28 1982-11-18 Vögtle, Fritz, Prof. Dr., 5305 Alfter Appliance for monitoring and safeguarding stirring operations, especially in chemical laboratories

Also Published As

Publication number Publication date
ATE34927T1 (en) 1988-06-15
DE3376959D1 (en) 1988-07-14
EP0112619A3 (en) 1986-07-30
EP0112619A2 (en) 1984-07-04

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