WO2007033989A1 - Mixing device and method for adding an additive to a pumpable mixture - Google Patents
Mixing device and method for adding an additive to a pumpable mixture Download PDFInfo
- Publication number
- WO2007033989A1 WO2007033989A1 PCT/EP2006/066628 EP2006066628W WO2007033989A1 WO 2007033989 A1 WO2007033989 A1 WO 2007033989A1 EP 2006066628 W EP2006066628 W EP 2006066628W WO 2007033989 A1 WO2007033989 A1 WO 2007033989A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mixing device
- additive
- metering
- mixture
- concrete
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/02—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions without using driven mechanical means effecting the mixing
- B28C5/06—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions without using driven mechanical means effecting the mixing the mixing being effected by the action of a fluid
-
- 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
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
- B01F25/3132—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit by using two or more injector devices
-
- 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
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
- B01F25/3133—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit characterised by the specific design of the injector
- B01F25/31331—Perforated, multi-opening, with a plurality of holes
-
- 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
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
- B01F25/433—Mixing tubes wherein the shape of the tube influences the mixing, e.g. mixing tubes with varying cross-section or provided with inwardly extending profiles
-
- 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
- B01F2101/28—Mixing cement, mortar, clay, plaster or concrete ingredients
Definitions
- the invention is based on a mixing device according to the preamble of the first claim.
- the invention is also based on a method for adding an additive to a pumpable mixture according to the preamble of the independent method claim.
- conventionally known static mixers are used for mixing an additive, eg, an activator with fine mortar. If you apply such known static mixer on conventional concrete, clogged the static mixer due to the coarse gravel quickly and the mixer can even be destroyed.
- the addition of the activator in the ready-mixed concrete and the mixing is therefore often already made in the vehicle drum.
- the activator liquefies the concrete and activates the setting mechanism.
- the disadvantage is that after the activator was added to the concrete in the vehicle drum, not much time may elapse until the activated concrete is processed in the building, otherwise it hardens before.
- the invention has for its object to provide in a mixing device and a method of the type mentioned a mixing device, which makes it possible to introduce additives quickly and effectively in a plastic-viscous mixture.
- the mixing device comprises a diffuser element and a Konfusorelement, and that in the interior of the mixing device at least one metering device is arranged with at least one metering, by means of which additive is added to the mixture
- the invention thus relates to a mixing device for the continuous, homogeneous addition of very small amounts of chemical liquid additives in a pumpable granule-suspension mixture having a plastic-viscous behavior, in particular fresh concrete or ready-mixed concrete, so that it can harden / set evenly and defined because an activator is used as additive in particular for concrete.
- a mixing device for the continuous, homogeneous addition of very small amounts of chemical liquid additives in a pumpable granule-suspension mixture having a plastic-viscous behavior, in particular fresh concrete or ready-mixed concrete, so that it can harden / set evenly and defined because an activator is used as additive in particular for concrete.
- Project lies in the homogeneous distribution of smallest amounts of the additive and in the clogging-free delivery, e.g. of the concrete through the mixer. More specifically, it concerns both a general risk of clogging when flowing the concrete to the metering as well as the flow from the cylindrical into the convergent part of the mixing device as well as local backflow in the mixing device and thus unequal residence times, resulting in different chemical reaction times in granular Suspension mixture leads.
- the inert gravel fraction as a suspension of the mixing ratio fine sand-cement-water can be understood.
- the additive is added via one or more metering devices, for example helix coils, etc., wherein the shape of the metering device and the number of metering points are designed and dimensioned with regard to a locally uniform and continuous distribution of the additive.
- metering devices for example helix coils, etc.
- the shape of the metering device and the number of metering points are designed and dimensioned with regard to a locally uniform and continuous distribution of the additive.
- Fig. 1 shows schematically the processing of concrete in a building
- Fig. 2 schematically shows the outer shape of the inventive
- FIG. 3 is a schematic illustration of the external shape of a further mixing device according to the invention.
- FIG. 4 is a schematic illustration of the mixing device according to the invention according to FIG. 2 with metering device
- FIG. 5 is a schematic representation of the mixing device according to the invention according to FIG. 2 with further metering device
- Fig. 6 is a schematic side view of the inventive
- FIG. 10 a schematic representation of a mixing device according to the invention with further metering device;
- FIG. Fig. 1 1 schematic representation of an inventive
- FIG. 12 shows a schematic representation of the geometry of the confuser
- FIG. Fig. 13 schematic representation of the geometry of the confuser
- Fig. 14 is a schematic representation of the geometry of the diffuser.
- Fig. 1 the processing of a plastic-viscous mixture, here shown by concrete 10 in a building is shown schematically.
- concrete is delivered to the construction site. Not shown is that the concrete is usually transported in a mounted on the transport vehicle, rotating drum. This concrete was treated with admixtures in the concrete plant so that the hydration or setting mechanism is delayed by several hours.
- This concrete generally corresponds to a pumpable granule-suspension mixture with plastic-viscous behavior.
- the concrete 10 is stored in a container 2 or pumped directly from the vehicle by means of a pump 3 and a line 4 under pressure to the site. Such a pipe can be used to transport the concrete over several 100 meters or even a few kilometers.
- additives 5 Prior to the processing of the concrete 10, this must be reactivated for processing by adding additives 5 (also called additive), such as activators, eg a setting accelerator.
- additives 5 also called additive
- activators eg a setting accelerator.
- the addition of the additive takes place in a mixing device 6.
- further substances can be supplied, for example water, Concrete from another source, etc ..
- the mixed with the admixture 5 concrete 10 ' is then processed accordingly at the construction site at the processing site 20.
- the processing of the concrete can be done by any method, for example by spraying, casting, etc.
- the distance from the mixing device to the processing is arbitrary, but advantageously chosen as short as possible, so that as little waste as possible, or activated concrete in the line remains and makes this possibly unusable.
- the mixing device With the present mixing device it is also possible to fill the line from the mixing device to the processing site with non-activated concrete 10 by no activator is added in the mixing device. This will prevent the line from clogging.
- the mixing device shown here makes it possible to meter in and admix small amounts of additive to the plastic-viscous mixture, in particular in a ratio of 1: 100 to 1: 1000.
- the mixing device 6 is shown schematically.
- This mixing device consists in the flow direction of the granular suspension mixture of a diffuser element 8, a cylinder element 9 and a Konfusorelement 11.
- the cylinder element 9 may have any cross-sections such as circular, oval, polygonal, etc., the cross sections are each adapted to the respective needs.
- the length of the cylinder element 9 is also in each case adapted to the respective conditions such as the amount of additive to be added, etc., and can be virtually zero according to FIG.
- the diameter of the cross section remains substantially constant.
- the diffuser element is divergent and has an expansion angle ⁇ .
- the Konfusorelement 1 1 is convergent and has a closing angle ß.
- a rapid reduction in diameter i. a large angle ß of concrete transport lines leads to constipation.
- outflow There are essentially two types of outflow, the core and the mass flow.
- the two outflow types are dependent on the closing angle, also called cone angle, and the exit diameter.
- the closing angle also called cone angle
- the exit diameter For example, in a silo at a steep angle core flow is present, ie the bulk material in the middle flows out, the bulk material on the wall remains temporarily.
- the piston delivery requires a constant outflow over the entire cross section, ie for the concrete a flow velocity which is constant over the cross section.
- the mass flow occurs. This flow is constant over the cross section. Compared with the requirement for a constant concrete flow rate, this means that the mass flow flow is the desired flow shape in the convergent part of the mixing device.
- the angle ⁇ is therefore preferably chosen so that a mass flow flow takes place.
- the cone geometry defined in the mixing device can now be carried out by means of criteria for the absence of bridge formations. These criteria require, among other things, that the angle ⁇ > ⁇ + ⁇ w must be, because then the solid bridge slides along the wall, so can not hold and thus also in the case of plastic-viscous granule-suspension mixtures as ready-mixed and ready-mixed concrete no blockage occurs. According to the invention, this results in the angle ⁇ which defines the contour of the cone, see FIGS. 12 and 13.
- the wall friction angle ⁇ w depends on the material flowing through and on the wall. Also according to FIG.
- the convergent part is advantageously defined by a convex and concave radius.
- the convergent part may for example be welded together from a dished, basket or hemispherical bottom and a "trumpet-shaped" confuser.
- the mixing device is advantageously arranged in each case in a line with the concrete line, so that it lies concentrically to the concrete line. As a result, pipe angles, bends, etc. are no longer necessary, which saves space.
- the mixing device can be installed both horizontally and vertically in the concrete delivery line.
- the mixing device 6 is shown with a metering device 12.
- the metering device 12 is here a helical coil on which several metering points 13 are arranged, these metering points can also as
- the metering points 13 are advantageously arranged in the flow direction of the mixture 10, so that the additive is metered in the direction of flow and do not clog the metering.
- the additive may be delivered via one or more of the metering devices 12, e.g. Helix coil, are added here, wherein the shape of the metering and number of metering 13 are formed and dimensioned with respect to a locally uniform and continuous distribution of the additive. This means u.a. that at the same time the flow of the granule-suspension mixture, e.g. of the concrete, is little impeded, so that there is no blockage. Further, due to the high solids content of I, e.g. Gravel in
- Prefabricated concrete ensures that the metered amount of liquid additive passes only in the suspension portion of the concrete. Gravel particles are inert and if they are just before a local metering or injection point, they redirect the additive jet only, see Fig. 9, and distribute the additive on.
- the course 14 of the additive added by the mixer 6 will now be explained by means of a metering point 13.
- the additive follows as a kind of additive thread to the mixture.
- these additive threads are shown as dots across the cross section.
- the granules-suspension mixture flows through the Confusor 1 1 and at the point 16, the additives are again shown as dots.
- the mixing device 6 is shown with a metering device 12 and 17, which consists of a first helical coil 12 and a second helical coil 17 here. These are nested in one another so that in the projection of the metering points on the cross-sectional area of the mixing device, a homogeneous distribution of the metering 13 takes place, see Fig. 7.
- Fig. 8 shows how often gravel particles can apply to metering. Gravel particles are inert and if they are just before a local metering or injection point, they redirect the additive jet only, see Fig. 9, and distribute the additive on.
- helix helix have a minimum distance a from the wall of the mixing device 6.
- clogging can occur both locally in the metering devices 12, 17 of the mixing device 6, which is inserted into a concrete transport pipeline, but also in the expanding diffuser and receding confocal device parts.
- Qualitatively considered is the promotion of the concrete in the cylindrical part by the mixing device to the
- Fig. 10 is another possibility of the embodiment of a
- the metering device consists of tubes 19 which are angled and twisted in each case to the other tube are arranged in the mixing device.
- a homogeneous distribution of the additive over the cross section is also possible, as can be seen from the projection at the point 21.
- FIG. 11 shows a further possibility of designing a metering device 22.
- the metering device consists of tubes 23, which are also angled and each arranged on a central tube 24.
- the central tube 24 is located substantially on the longitudinal axis of the mixing device 6.
- the tubes 23 and thus the metering points not shown can be supplied with additive. This arrangement also allows a homogeneous distribution of the additive over the cross section.
- the tubes 19 and 23 shown in Figs. 10 and 11 advantageously have a corresponding pitch to avoid the clogging problems described above.
- the liquid additive is advantageously pumped through the metering devices so that it flows at the end of the metering device through a line back to the feed pump. There is thus a cycle.
- This gives over the entire length of the additive line length a virtually uniform pressure loss through the metering and thus a uniform metering of the additive at eachselfstelle.
- the additive is supplied so that it has an overpressure compared to the granule-suspension mixture. This allows the injection and at the same time prevents the nozzle clogged.
- the invention is not limited to the embodiment shown and described.
- any additives or other substances can be used, which are to be mixed in relatively small amounts in a plastic-viscous mixture.
- the plastic-viscous mixture to be used is arbitrary per se.
- mixing devices as set forth above can be used not only for the admixture of admixtures in concrete, but also anywhere where something has to be blended into a mixture with plastic-viscous behavior. Applications are thus in the construction industry, oil refining, pyrometallurgical addition in the extraction of metals from ores, alloying of metals, pasta production, introduction of additives in doughs, eg of nuts in bread, incorporation of berries, etc.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06793746A EP1928638A1 (en) | 2005-09-23 | 2006-09-22 | Mixing device and method for adding an additive to a pumpable mixture |
JP2008531709A JP2009508725A (en) | 2005-09-23 | 2006-09-22 | Mixing apparatus for adding additive to pumpable mixture and method for adding the same |
CA002626090A CA2626090A1 (en) | 2005-09-23 | 2006-09-22 | Mixing device and method for adding an additive to a pumpable mixture |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05108813.6 | 2005-09-23 | ||
EP05108813A EP1767322A1 (en) | 2005-09-23 | 2005-09-23 | Mixing device and method for introducing an additive into a pumpable mixture |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007033989A1 true WO2007033989A1 (en) | 2007-03-29 |
Family
ID=35841735
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2006/066628 WO2007033989A1 (en) | 2005-09-23 | 2006-09-22 | Mixing device and method for adding an additive to a pumpable mixture |
Country Status (5)
Country | Link |
---|---|
EP (2) | EP1767322A1 (en) |
JP (1) | JP2009508725A (en) |
CN (1) | CN101389455A (en) |
CA (1) | CA2626090A1 (en) |
WO (1) | WO2007033989A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2011310100B2 (en) * | 2010-10-01 | 2015-01-15 | Sika Technology Ag | Mixing apparatus for pumpable mixtures and method related thereto |
EP2436496A1 (en) * | 2010-10-01 | 2012-04-04 | Sika Technology AG | Mixing unit for pumpable mixtures, particularly for sprayed concrete |
EP2476530A1 (en) * | 2011-01-12 | 2012-07-18 | Sika Technology AG | Dosing unit and housing element for a mixing device |
CN103009484A (en) * | 2012-12-20 | 2013-04-03 | 常熟市大生机械厂 | Novel concrete stirring barrel |
CN104015264A (en) * | 2013-12-15 | 2014-09-03 | 广西鱼峰水泥股份有限公司 | Cement additive weighing device |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE460796C (en) * | 1928-06-05 | Adolf Wolfsholz | Method for spraying mortar or the like. | |
US1848122A (en) * | 1930-02-20 | 1932-03-08 | Alois W Forster | Device for use in introducing alpha fluid into alpha conduit for flowing materials |
US4264212A (en) * | 1978-05-26 | 1981-04-28 | Blue Circle Industries Limited | Static mixer |
JPS6131573A (en) * | 1984-07-21 | 1986-02-14 | 鶴島建機株式会社 | Concrete spraying apparatus and accelerator mixing pipe thereof |
DE19746958C1 (en) * | 1997-10-24 | 1999-06-17 | Friedhelm Eber | Assembly to mix building mortar, water and air and discharge through a jet |
-
2005
- 2005-09-23 EP EP05108813A patent/EP1767322A1/en not_active Withdrawn
-
2006
- 2006-09-22 WO PCT/EP2006/066628 patent/WO2007033989A1/en active Application Filing
- 2006-09-22 EP EP06793746A patent/EP1928638A1/en not_active Withdrawn
- 2006-09-22 JP JP2008531709A patent/JP2009508725A/en not_active Withdrawn
- 2006-09-22 CN CNA2006800421998A patent/CN101389455A/en active Pending
- 2006-09-22 CA CA002626090A patent/CA2626090A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE460796C (en) * | 1928-06-05 | Adolf Wolfsholz | Method for spraying mortar or the like. | |
US1848122A (en) * | 1930-02-20 | 1932-03-08 | Alois W Forster | Device for use in introducing alpha fluid into alpha conduit for flowing materials |
US4264212A (en) * | 1978-05-26 | 1981-04-28 | Blue Circle Industries Limited | Static mixer |
JPS6131573A (en) * | 1984-07-21 | 1986-02-14 | 鶴島建機株式会社 | Concrete spraying apparatus and accelerator mixing pipe thereof |
DE19746958C1 (en) * | 1997-10-24 | 1999-06-17 | Friedhelm Eber | Assembly to mix building mortar, water and air and discharge through a jet |
Also Published As
Publication number | Publication date |
---|---|
EP1767322A1 (en) | 2007-03-28 |
EP1928638A1 (en) | 2008-06-11 |
CN101389455A (en) | 2009-03-18 |
JP2009508725A (en) | 2009-03-05 |
CA2626090A1 (en) | 2007-03-29 |
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