EP3072580A1 - Dispositif de mélange et procédé de mélange - Google Patents

Dispositif de mélange et procédé de mélange Download PDF

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Publication number
EP3072580A1
EP3072580A1 EP15161142.3A EP15161142A EP3072580A1 EP 3072580 A1 EP3072580 A1 EP 3072580A1 EP 15161142 A EP15161142 A EP 15161142A EP 3072580 A1 EP3072580 A1 EP 3072580A1
Authority
EP
European Patent Office
Prior art keywords
mixing
space
tool
mixing space
mix
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.)
Withdrawn
Application number
EP15161142.3A
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German (de)
English (en)
Inventor
Manfred Kleimeier
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.)
MAT Mischanlagentechnik GmbH
Original Assignee
MAT Mischanlagentechnik GmbH
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 MAT Mischanlagentechnik GmbH filed Critical MAT Mischanlagentechnik GmbH
Priority to EP15161142.3A priority Critical patent/EP3072580A1/fr
Publication of EP3072580A1 publication Critical patent/EP3072580A1/fr
Withdrawn legal-status Critical Current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
    • B01F23/57—Mixing high-viscosity liquids with solids
    • 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
    • B01F23/53—Mixing liquids with solids using driven stirrers
    • 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
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/625—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis the receptacle being divided into compartments, e.g. with porous divisions
    • 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
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/70—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms
    • B01F27/701—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms comprising two or more shafts, e.g. in consecutive mixing chambers
    • 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
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/72—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with helices or sections of helices
    • B01F27/725—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with helices or sections of helices with two or more helices in respective separate casings, e.g. one casing inside the other

Definitions

  • the present invention relates in a first aspect to a mixing device according to the preamble of claim 1.
  • the invention relates to a mixing method according to the preamble of claim 10.
  • Mixing devices are used for the colloidal and homogeneous treatment of mix, which can be understood in particular flowable and pumpable suspensions, mortar and fine concrete.
  • the fine concrete may in particular have a density greater than 2.0 kg / dm 3 .
  • These include, for example, UHPC (ultra-high-performance concrete), SVB (self-compacting concrete), ductile concrete, injection and casting compounds, high-performance concrete for the production of prefabricated parts and filigree components.
  • Such mixed materials are used, in particular, in the concrete industry, in precast plants, concrete product manufacturers, fresh concrete plants, concrete restoration, crack fillings and surface coatings.
  • Known mixing devices include, in particular, free-fall mixers, which include, for example, drum mixers, double-cone mixers and container mixers. Also mechanical mixing devices with inevitable Mischgutterrorism are known. These include single-shaft mixers, plugscharmers, worm-belt mixers, paddle mixers, twin-shaft mixers, plate mixers and ring trough mixers.
  • blends usually have a very tough, sticky texture as a ready-made mix. They usually require higher shear rates and short processing times, especially because of a quick stiffening of the finished mixture.
  • composition there are differences in comparison with older mixtures in particular in that high-quality binders such as finely ground cements are used and that special additives, such as crushed aggregates are used that very fine additives, especially microsilica, fly ash or color pigments, and special additives, such as plasticizers , Flow agents and / or retarders, or fibers, for example steel, plastic or glass fibers, are added.
  • high-quality binders such as finely ground cements
  • special additives such as crushed aggregates are used that very fine additives, especially microsilica, fly ash or color pigments
  • special additives such as plasticizers , Flow agents and / or retarders, or fibers, for example steel, plastic or glass fibers, are added.
  • composition of a mixture may in particular be as follows: Mixing water: 110-120 dm 3 / m 3 Binder (for example cement): 400-450 kg / m 3 Additives: 4-20 dm 3 / m 3 Additives (for example fly ash, silica fume): 30-100 kg / m 3 Supplements (with a aggregate ⁇ 5mm): 1800-2000 kg / m 3
  • a mixing device should be able for such mixed materials to always ensure the highest possible homogeneity in the finished mix despite the recipe-dependent present in very different amounts and different states of matter individual components.
  • the individual components should occur in each sample from the ready mix in the same distribution and composition.
  • Known mixing devices require relatively long mixing times in order to achieve a homogeneous distribution and good digestion of the powdery constituents in the mixed water.
  • silica fume with a low bulk density of, for example, 0.3-0.6 kg / dm 3 and a large specific surface area of, for example, 150,000 to 350,000 cm 2 / g requires a very long mixing time until it is homogeneously distributed and is colloidally digested by the mixed material friction.
  • an object of the invention can be considered to provide a mixing device and a mixing method with which blends of different types can be processed as efficiently as possible.
  • the upper mixing tool according to the invention is rotatably mounted about an approximately horizontally extending upper axis of rotation and the lower mixing tool is rotatably mounted about an approximately horizontally extending lower axis of rotation.
  • the upper mixing tool is rotated about an approximately horizontal upper axis of rotation and the lower mixing tool is rotated about an approximately horizontally extending lower axis of rotation.
  • the mix between the two mixing tools circulates.
  • the mix is therefore not after first mixing by the lower mixing tool issued directly, but passes back to the upper mixing tool.
  • the two mixing tools different effects can be achieved, for which they preferably differ in shape and / or speed.
  • a desired homogeneous distribution of constituents in the mix can be achieved in a much shorter time than if only one mixing tool were used, or two mixing tools that do not cause the circulation of the invention due to their arrangement or orientation.
  • a circulation should thereby be made as precise as possible, ie a flow of the mixed material, which leads the mix several times in succession to the upper and the lower mixing space.
  • At least one motor may be provided for rotating the upper mixing tool and the lower mixing tool, the upper mixing tool being shaped and rotatable by the motor to convey mix within the upper mixing space in a first direction of travel parallel to the upper axis of rotation is (that is, has at least one significant component of motion in the direction of the upper axis of rotation).
  • the lower mixing tool is shaped and rotatable by the motor to convey mix within the lower mixing space in a second direction of movement opposite to the first direction of movement. By opposite directions of movement, a circulation of the mix between the upper and lower mixing tool is promoted. The opposite directions of movement can be achieved when the directions of rotation of the upper and lower mixing tools are opposite to each other.
  • the directions of rotation can also coincide if the mixing tools are suitably shaped.
  • mixing elements of the two mixing tools are inclined to the axes of rotation, wherein the oblique orientations are opposite to each other, that form a positive angle to the axis of rotation in a mixing tool and form a negative angle to the axis of rotation in the other mixing tool.
  • the mix is mixed in the invention by the upper mixing tool not only turbulent, but also forwarded horizontally.
  • the lower mixing tool mixes the mix not only turbulent, but also passes this horizontally, but in the opposite direction on.
  • the upper mixing space may be separated from the lower mixing space by a dividing wall, the dividing wall having at least one forwarding opening for passing mix from the upper mixing space into the lower mixing space and having at least one return opening for returning mix from the lower mixing space to the upper mixing space ,
  • a partition promotes a circulation-like flow of the mixed material.
  • the forwarding opening (s) and the return opening (s) may in principle be identically shaped openings. Their function of the forward or return line results from the flow of the mixed material, which is determined by the mixing tools and is also influenced by the partition wall.
  • the two mixing chambers are connected only by channel-like openings and not over the entire base area of the upper or lower mixing space.
  • the openings together preferably comprise at most 10% or 20% of the total contact area between the two mixing spaces.
  • the partition may extend over the entire axial length of the two mixing chambers.
  • the axial length indicates the length of the mixing chambers in the direction of the two axes of rotation.
  • a width of the partition may be equal to the width of the lower mixing space and thus substantially equal to the diameter of the lower mixing tool.
  • the at least one forwarding opening can be formed along the first direction of movement in a rear region of the dividing wall, with which the upper mixing tool conveys mixed material within the upper mixing space in the direction of the at least one forwarding opening.
  • the at least one return opening can be formed along the first direction of movement in a front region of the dividing wall, with which the lower mixing tool conveys mixed material within the lower mixing space in the direction of the at least one return opening.
  • the relay opening and the return opening are located in the axial direction of the mixing chambers at opposite ends. This helps to circulate as much as possible of the mix between the two mixing chambers.
  • the lower mixing space may have a cross section, that is, a cross section perpendicular to its axial length, with a lower semicircular area.
  • a circle center of the semicircular area may coincide with the lower axis of rotation.
  • mix in the lower mixing chamber is mixed as completely as possible.
  • the cross-section of the lower mixing space may also have arc-shaped sections above the semicircular area; for a connection to the upper mixing space, it may also be advantageous if the walls of the lower mixing space extend substantially vertically from the end of the semicircular area to the upper mixing space. This results in a U-shaped cross-section.
  • the upper mixing space may also have a cross section with a lower semicircular area, but this semicircular area is interrupted by a transition to the lower mixing space.
  • a circle center of the semicircular area of the upper mixing space can in turn coincide with the upper axis of rotation.
  • a radius of the semicircular portion of the upper mixing space is greater than a radius of the mixing tool to form a gap between a wall of the semicircular portion of the upper mixing space and the upper mixing tool.
  • the radius of the mixing tool can be understood to be its maximum dimension from the axis of rotation of the mixing tool to an outer end of the mixing tool in a plane perpendicular to the axis of rotation.
  • the gap between the mixing tool and the semicircular area may be at most 10% or at most 5% of the radius of the semicircular area and / or may be at least 1 cm or 2 cm. This ensures that as far as possible the entire mix in the upper mixing chamber is mixed by the upper mixing tool and transported on. At the same time it is avoided that granular components of the mix between the mixing tool and the wall of the semi-circular area are clamped, which would increase the wear of the mixing tool.
  • a gap with in particular the same or essentially the same size can also be formed on the semicircular area of the lower mixing space.
  • the upper and lower mixing chambers can have the same cross-section over their axial length, that is to say their length in the direction of the axes of rotation. This can be shaped as described above, in particular it can be U-shaped. Preferably, both mixing chambers have the same axial length. This is important for a homogeneous preparation of the mix, for which the entire mix should change several times between the upper and lower mixing space.
  • the ratio between the volume of the upper mixing space and the volume of the lower mixing space is between 1.5: 1 and 6: 1, the upper mixing space So much larger than the lower mixing space.
  • This volume ratio is preferably between 2: 1 and 5: 1.
  • the upper mixing chamber is open at the top, its volume can be measured up to a height in the upper mixing chamber, to which the upper mixing tool extends.
  • the partition may be considered or the middle between the ends of the upper and lower mixing tools.
  • a radius of the semicircular area of the upper mixing space is preferably larger than a radius of the semicircular area of the lower mixing space.
  • the input opening for mix can be provided above the upper axis of rotation.
  • the mixed material dispensing opening may be provided below the lower axis of rotation and at one end of the lower mixing space.
  • the substantially horizontal orientation of the two axes of rotation may include not only a precisely horizontal orientation but also such orientations that deviate to 20 ° or 30 ° from a horizontal orientation.
  • a direction perpendicular to gravity can be considered.
  • the indications “upper” and “lower” can be understood in the direction of gravity. general but also the horizontal direction can be defined as transverse or perpendicular to the direction between the upper and the lower mixing space, wherein in statements “upper” and “lower” need not necessarily be understood in the direction of gravity.
  • the axes of rotation are at an angle to each other, which may be within or transverse to a horizontal plane.
  • the speeds of the upper and lower mixing tools can be fixed.
  • a rotational speed of the upper mixing tool and a rotational speed of the lower mixing tool are set as a function of a drive power and a prescribed shear rate. This can in particular be done automatically by means of electronic control means. Mapping data may also be stored for the electronic control means, from which a specific shear rate can be read or determined from another variable to be preset.
  • the other size to be specified may, for example, be a material composition of the mixed material. This is input by a user and the control means determines a particular shear rate dependent thereon, and in turn the speed is adjusted depending on this shear rate.
  • the lower mixing tool is rotated at a speed which is greater than a speed of the upper mixing tool.
  • the speed of the lower mixing tool may be at least 3 times, preferably at least 5 times or 7 times, as high as that of the upper mixing tool.
  • each mixing tool has its own motor, wherein the motors are operated at different speeds.
  • the mixing tools can comprise arbitrarily shaped mixing elements, which can be rotated about an axis of rotation and thereby mix a surrounding mix.
  • the mixing elements are not only perpendicular to the axis of rotation, but also at least partially oblique or at an angle not equal to 90 ° to the axis of rotation, so that upon rotation, a conveyance of the mix is also effected in the direction of the axis of rotation.
  • the mixing tools can either be permanently or reversibly detachably connected to their respective associated rotor.
  • the upper mixing tool can also be referred to as a homogenization tool.
  • the homogenizing tool may have mixing elements in the form of a ribbon or blade coil or in the form of a paddle, a blade or a ploughshare. A combination of these forms is possible.
  • the lower mixing tool preferably has mixing elements which are shaped differently than those of the homogenization tool and in particular may have the shape of a full-area or perforated paddle, a blade, a plowshare or a combination thereof.
  • a significant improvement in the mixing result is achieved if not all parts of the mix are introduced simultaneously or directly successively into the mixing device.
  • a first part of the mixed material is introduced into the upper mixing space.
  • This first part comprises liquid components, a powdered binder and optional additives.
  • This first part of the mix is now mixed with the two mixing tools, in particular, it is processed into a colloid-digested Bindeleim. Only now is another part of the mix added.
  • This further part includes components that are not included in the first part; likewise, not all components of the first part are included in this further part.
  • the further part may comprise coarse and / or fibrous constituents.
  • the mixing device is dust and liquid-tight, that is, the input port, the discharge port and the two mixing chambers are dustproof and liquid-tight closed or lockable to an environment of the mixing device.
  • FIGS. 1 to 3 An embodiment of a mixing device 100 according to the invention is in the FIGS. 1 to 3 shown. It shows FIG. 1 a cross section of the mixing device 100 and FIG. 2 a longitudinal section, that is, a section at a right angle to the view of FIG. 1 ,
  • the mixing device 100 comprises an upper mixing chamber 10 and below a lower mixing chamber 30. In each of the mixing chambers 10, 30, a mixing tool 15, 35 is arranged.
  • the upper mixing space 10 has a U-shaped cross-section, wherein the upper side has an input opening 11. Through this mix can be introduced into the upper mixing chamber 10.
  • the upper mixing chamber 10 has over its axial length the same cross section, the in Fig. 1 is shown.
  • the upper mixing tool 15 rotates about an upper axis of rotation 16 which extends in the axial direction of the upper mixing space 10.
  • the axis of rotation 16 lies straight on a circle center to the circular arc-shaped portion of the U-shape. As a result, the mixing tool 15 adjoins the bent regions of the U-shape except for a gap.
  • the lower arc of the U-shaped mixing chamber 10 has a plurality of openings 21 and 22 through which mix can pass into the lower mixing chamber 30 and from there back into the upper mixing chamber 10.
  • the lower mixing space 30 may also have a U-shaped cross-section, but the arcuate portion of the U-shape is closed down. As in Fig. 2 shown, both mixing chambers 10, 30 may have the same axial length.
  • the lower mixing tool 35 is rotated about a rotation axis 36, which in turn lies on the arc midpoint of the arcuate lower portion of the U-shape of the lower mixing chamber 30.
  • the mixing device 100 in contrast to known mixing devices, in the mixing device 100 according to the invention a particularly homogeneous distribution of particles in the mix is substantially achieved by repeatedly feeding the mix to the two different mixing tools 15, 35.
  • the relevant flow of the mixture is indicated by arrows in FIG. 2 illustrated.
  • the upper mixing tool 15 generates a conveyance of the mixture within the upper mixing chamber 10 in the axial direction along the arrow 17.
  • the lower mixing tool 35 generates a transport of the mixed material within the lower mixing chamber 30 in this opposite direction, that is, along the arrow 37. Therefore
  • the mixing device 100 is also referred to as a countercurrent mixer.
  • Mixing material passes from the upper mixing space 10 through the opening 21, which is also described as a forwarding opening 21, into the lower mixing space 30. Because of the opposite conveying or flow direction effected there, the mix is passed through the opening 22, which is also referred to as the return opening 22. pushed back into the upper mixing chamber 10.
  • a discharge opening 31 at the lower mixing space 30 is closed at the beginning of the mixing process.
  • the mixture is circulated several times between the two mixing chambers 10, 30, until a desired homogeneity is achieved. Only then is the dispensing opening 31 opened to dispense the mix.
  • the opposite flows of the mixed material in the two mixing chambers 10, 30 can be achieved in that the two mixing tools are rotated in the opposite direction about their mutually parallel axes of rotation 16, 36. These opposite directions are in Fig. 2 indicated by corresponding arrows. In principle, however, it is also possible to achieve opposite directions in the same direction of rotation by corresponding shaping of the mixing tools 15, 35.
  • the openings 21 and 22 between the two mixing chambers 10, 30 are formed in a partition wall 20 which schematically in a plan view in FIG. 3 is shown.
  • the partition wall 20 may in particular form an upper cover of the U-shaped lower mixing space 30.
  • the partition wall 20 may be formed as an insertable strip. In the example shown, it consists of two identically shaped strips or sections which are rotated 180 ° to each other. As a result, the two openings 21, 22 are located at axially remote ends of the partition wall 20th
  • a mix can be processed in a particularly homogeneous manner in a relatively short time.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
EP15161142.3A 2015-03-26 2015-03-26 Dispositif de mélange et procédé de mélange Withdrawn EP3072580A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15161142.3A EP3072580A1 (fr) 2015-03-26 2015-03-26 Dispositif de mélange et procédé de mélange

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15161142.3A EP3072580A1 (fr) 2015-03-26 2015-03-26 Dispositif de mélange et procédé de mélange

Publications (1)

Publication Number Publication Date
EP3072580A1 true EP3072580A1 (fr) 2016-09-28

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EP15161142.3A Withdrawn EP3072580A1 (fr) 2015-03-26 2015-03-26 Dispositif de mélange et procédé de mélange

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108144474A (zh) * 2017-12-14 2018-06-12 南昌华学科技有限公司 一种道路交通安全设施路面标线涂料生产用原料混合机

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2411138A (en) * 1943-03-27 1946-11-12 Western States Machine Co Centrifugal mixer apparatus
GB718893A (en) * 1949-10-04 1954-11-24 Reliance Gear Company Ltd Improvements in or relating to apparatus for preparing food for livestock
US3901483A (en) * 1973-07-13 1975-08-26 William Lasar Method and apparatus for mixing materials, including ground meat
WO1994021434A1 (fr) * 1993-03-23 1994-09-29 Hydromix, Inc. Systeme de melange de beton comportant un premelangeur de ciment et d'eau

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2411138A (en) * 1943-03-27 1946-11-12 Western States Machine Co Centrifugal mixer apparatus
GB718893A (en) * 1949-10-04 1954-11-24 Reliance Gear Company Ltd Improvements in or relating to apparatus for preparing food for livestock
US3901483A (en) * 1973-07-13 1975-08-26 William Lasar Method and apparatus for mixing materials, including ground meat
WO1994021434A1 (fr) * 1993-03-23 1994-09-29 Hydromix, Inc. Systeme de melange de beton comportant un premelangeur de ciment et d'eau

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108144474A (zh) * 2017-12-14 2018-06-12 南昌华学科技有限公司 一种道路交通安全设施路面标线涂料生产用原料混合机

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