EP1064133B1 - Method for producing foaming substances, especially foaming cement substances, and corresponding device - Google Patents

Abstract

The invention relates to a method for producing foaming substances, especially foaming cement substances, consisting essentially of a starting product, especially cement paste, and a foaming agent. The inventive substances are produced in a mixing reactor which is connected to a supply container for the starting product by a feed pump. A product flow taken from the mixing reactor is conveyed to the supply container in a circuit, the foaming agent and atmospheric air being added and the supply container being kept at a minimum level. After a mixing phase, a sub-flow is taken from the product flow for processing.

Description

The invention relates to a method of manufacture of foam materials, in particular foam cement materials, which are essentially from a starting product, in particular cement paste, and a foaming agent, in one over one Feed pump with a storage container for the starting product related mixing reactor and an apparatus therefor.

Foam masses or foam cement masses are used in modern Building technology, especially when renovating old buildings as well as in the construction of new buildings, often used. In the production of walkable floors, screeds, etc. must usually to compensate for height differences on the bare floor, Depressions, cavities and the like applied in order to manufacture the further floor structure. This balance is generally achieved by installing foamed sheets and / or the use of loose fillings of insulation materials accomplished. However, these are known compensation procedures very labor intensive and therefore expensive. in the they are also questionable from an occupational medical point of view.

The production of such a foam mass, in which a different binder is used instead of cement, or foam cement mass is carried out by mixing air, water and a foaming agent into a foam. This foam is fed to a mixing device at the processing site and introduced into a cement paste consisting of cement and water. This manufacturing process is almost exclusively suitable for the production of a so-called heavy foam with a foam density of more than 800kg / m ³ .

DE 41 18 537 C1 discloses a method for producing a so-called lightweight foam with a foam density between 250 and 400kg / m ³ and an apparatus for carrying out the method. Here, cement paste is injected into a mixing chamber under high pressure and mixed with a foaming agent. Due to the high pressure, this mixture is fed to an expansion nozzle into which compressed air is blown in to foam.

Furthermore, DE 36 31 223 A1 shows a device for Production of a hardening foam mass with a fine pore structure, in particular a cement foam mass that a Pipe supplied and arranged in the pipe transport and Mixing tools both transported and mixed becomes. The water and foaming agent Foam mass is via the transport path formed by the tube distributed from outside. This is intended to reduce the water content the foam mass that adversely affects curing the same affects, are reduced.

Furthermore, DE 32 22 033 A1 describes a process for the production a pore mortar with a low specific Weight described using compressed air. to The device is used to carry out the method Perforated plates exist in a row in a pipe are arranged and through which the mortar mass flows. By appropriate connections, the compressed air is introduced into the pipe, where it mixes with the mortar.

Furthermore, DE-A-23 48 915 discloses a plant for the production of foam cement, each with a volumetric pump for pumping water, foam, air and cement paste or mortar. Pumps for water, foam and the air is connected to a foam-forming sling, which is connected to a collector in which the cement or mortar is promoted. The mixture is from the collector transported to a mixing machine at the point of use.

The known devices and methods are disadvantageous in that than the consistency and thus the quality of the Foam masses or foam cement masses through the multitude of consecutive mixing and conveying units changed. Furthermore, the known systems are only for production of foam masses in a very restricted density range suitable and very complex using a variety built by auxiliary units.

UA-A-5 556 033 describes a device for manufacturing a sprayable foam mass for a weatherproof Protective cover known to cover a waste dump (Landfill). The device comprises a storage container in which an agitator is arranged with a mixer is connected and to promote the foam mass is coupled with a pumper that blends the mixture into one Control valve transported. From this regulator valve an outlet leads to an injection device, on the one hand via a pipeline to the storage container and to the other via an inlet channel in connection with a foam generator stands. The foam generator comprises a foam agent tank which is coupled to an injector, the injector to make a foam with a Compressor for generating compressed air is connected. The one with Compressed air produced foam is through a nozzle of the injection device fed and passes through the pipeline into the storage container in which the foam with the agitator is mixed into a slurry, which in turn is from the Pump is fed to the regulating valve. From the regulating valve a partial flow is coupled through a pipeline Jet nozzle discharged and a product stream in turn passed to the injector in which the product flow Foam is fed, after which the product flow through the pipeline again gets into the storage container.

DE-A-31 32 667 discloses a method and a device for producing porous or foam concrete or the like, with foaming agents, water and Compressed air for producing a raw material to be mixed Foam can be merged. The foam agent supply is controlled by the inflowing water. to Carrying out the process is the water inflow as a jet pump trained for the liquid foaming agent, its inflow opens directly at the jet pump nozzle. In the further The course is the supply of compressed air for processing of the foaming agent provided, which is then a Foam lance gets into a mixing vessel, where the now formed Foam is mixed with the starting product.

From US-A-2 733 053 is a mixing machine for manufacturing a foam cement mass known, the principle of which is based on to circulate a solid material in a mixing reactor and with to mix different components, being in the mixing reactor a rotating agitator is arranged. For storage the components are a water tank 16 and a cement tank 20 provided.

It is the object of the invention to produce a method of foam masses, especially foam cement masses, of the beginning mentioned type and a device for performing the Process to create that at a processing point is used and a high quality of the manufactured Foam masses guaranteed.

According to the invention, the object is thereby achieved solved that a product stream taken from the mixing reactor under Supply of the foaming agent and atmospheric air in the Circulation the storage container kept at a minimum level is supplied via a jet pump, the product stream after a mixing phase, a partial flow for processing is removed and the product stream in the jet pump the foaming agent is added.

The product stream flowing continuously through the mixing reactor, essentially from that stored in the storage container Starting product, the foaming agent and atmospheric Air exists in an empirically determined mixing phase mixed with the starting product until one homogeneous foam mass of high quality is present. After the Product flow has a homogeneous consistency, is the mixing phase ended and the product stream becomes a partial stream taken for processing. Even after the mixing phase the product stream is circulated through the mixing reactor, whereby its high quality and thus the quality of the substream for processing is retained. The starting product, for example cement glue, is with a truck mixer to the storage container at the processing point transported, its transport capacity not through the foaming agent is reduced because it is provided separately becomes. To ensure intensive mixing of the product flow with the atmospheric air, the Product stream fed into the storage container via a jet pump. In addition, by adding the foaming agent pollution to the product stream in the jet pump greatly reduced during the production of the foam mass.

In particular for the production of a foam mass with a low In addition to the foaming agent, additional densities become dense needed. A compressed gas is preferably added to the product stream.

According to an advantageous embodiment of the inventive concept the compressed gas becomes the product stream in the jet pump added. This will cause excessive dust formation or contamination during the production of the foam mass greatly reduced and occupational health concerns always can occur as far as possible if there is a lot of dust be excluded.

The amount of the product stream is expediently mixed Foam agent and / or the compressed gas measured and regulated. This measure allows the foam mass to be adjusted to a desired density, which is required for processing is. Furthermore, the foam agent is expediently and / or the compressed gas from a metering pump through a Flow meter conveyed to the jet pump.

According to a further embodiment of the invention the partial flow a density measuring device. This continuously working facility serves to monitor the quality of the Partial flow.

The density of the partial stream is preferably volumetric or determined gravimetrically. The partial flow is also preferred depending on the result of the density measurement of the processing point or fed to the storage container. A partial flow that does not meet the quality requirements therefore not for processing, but is together with the Product stream reprocessed.

The task is done in a constructive way with a device for the production of foam compositions, in particular foam cement compositions, which essentially consists of a starting product, in particular cement paste, and a foaming agent, with one via a feed pump with a storage container for the Starting product related mixing reactor, in particular to carry out the aforementioned method according to the invention solved in that the mixing reactor one to one Jet pump leading outlet for a product stream, a outlet leading to a processing point for a Partial stream of the product stream and an inlet for the product stream from the reservoir, the product stream above the fill level of the storage container from the with an inlet for the jet pump exits and within the mixing reactor at least one static Mixing element is arranged.

Because of these measures, the mixing reactor is relatively compact constructed and can be in the immediate vicinity of a processing point place. The fact that the mixing reactor a separate outlet and an inlet for the product stream and an outlet for the partial stream of the product stream is the separate circulation of these streams possible. Only then is a partial stream removed from the product stream, which is supplied to the processing point when the Product stream has the required quality. By the Outlet of the product flow above the fill level of the storage container the jet pump becomes a homogeneous mixture achieved to increase the quality of the foam mass is.

It is expedient within the mixing reactor at least a mixing element arranged. The mixing element causes one Swirling of the product flow and thus the generation of a uniform mass in the mixing reactor.

At least one is preferred within the mixing reactor Fine protection screen fixed. The fine protection screen is expedient arranged before the outlet for the product stream, where the outlet for the product flow at one of the inlet for the product stream opposite side of the mixing reactor located. Because of this measure, larger particles of the product stream retained in the mixing reactor and the jet pump is protected from damage from these particles protected.

In order to mix the product stream in the mixing reactor intensify stands for an advantageous embodiment the invention of the mixing reactor with an external vibrator in connection. Here the vibrator is to be set so that an already generated foam structure of the foam mass does not Damage suffers, after which an even and finely divided Air pore structure is retained in the foam mass.

Because the vibrations of the mixing reactor are not full size to be transferred to the storage container is expedient the mixing reactor via a pipeline and a Hose with the intermediate feed pump with the Reservoir connected.

To achieve an intimate mixing of the product flow under the use of an existing conveyor line is preferred the pipe inside with at least one Provide mixing element.

According to another exemplary embodiment of the inventive idea is the jet pump with an inlet for the Provide compressed gas. This measure makes the compressed gas direct into the jet pump or into the jet pump flowing through it Product flow initiated and pollution through uncontrolled escaping products is largely excluded.

For the production of a foam mass with a defined, adjustable The jet pump is preferably each density Dosing pump for supplying the flow through a flow meter Foam agent and / or compressed gas assigned.

In order to continuously or randomly review the Ensuring the density of the partial flow is expedient a connection line to the outlet for the partial flow of the product flow with interposed density measuring device assigned. It is also used to control the quantity discharged of the partial flow at the processing point the connecting line with a flow meter downstream of the density measuring device Mistake.

Because a partial flow that does not have the predetermined properties has, should not be processed, stands the density measuring device with a return line in connection, that leads to the reservoir. Thus such a Partial stream introduced into the starting product or the product stream and reprocessed.

This prevents the entry of coarse particles into the device is preferably the storage container with a Protective screen covered.

According to an alternative embodiment of the invention Jet pump for the product stream a dosing jet pump for assigned a partial product stream that the foaming agent and / or the compressed gas feeds the partial product stream, after which the partial product stream enters the mixing reactor. by virtue of this measure becomes a certain density of the partial product flow set. After mixing the partial product stream with the product stream in the mixing reactor, a resulting density required for processing.

It is understood that the above and below Features to be explained not only in each case specified combination, but also in other combinations are usable without the scope of the present invention to leave.

Fig.1

eine schematische Darstellung einer erfindungsgemäßen Vorrichtung und

Fig.2

eine schematische Darstellung eines Teils der erfindungsgemäßen Vorrichtung in einer alternativen Ausgestaltung.

The invention is explained below using an exemplary embodiment with reference to the accompanying drawings. Show it:

Fig.1

a schematic representation of a device according to the invention and

Fig.2

a schematic representation of part of the device according to the invention in an alternative embodiment.

The device for producing a foam composition comprises Fig. 1 essentially a storage container 1 for receiving of a starting product A, which is covered by a protective screen 2 is and via a feed pump 3 with a mixing reactor 4 communicates. The feed pump 3 is on the one hand via a hose 5 to the storage container 1 and to the other by means of a pipeline 6 to an inlet 7 of the Mixing reactor 4 connected for a product stream B. The Inner wall of the pipeline 6 is with mixing elements, not shown Mistake.

The mixing reactor 4 carries 8 mixing elements on its inner walls 9 and is connected to an external vibrator 10. At the inlet 7 for the product stream B opposite The mixing reactor 4 faces one side Jet pump 11 leading outlet 12 for the product stream B as well an outlet 14 leading to a processing point 13 for a partial stream C of the product stream B. Before leaving 12 a fine protection screen 15 is fixed, which the passage prevents coarse particles. In the further is between the departure 12 and the jet pump 11, a shut-off valve 16 is arranged.

The jet pump 11 has an inlet on its suction side 17 provided for a foam agent 18, which is via a metering pump 19 with downstream flow meter 20 the product stream B is added. The jet pump 11 also has a Inlet 21 for a compressed gas 22, which also has a Metering pump 23 with a downstream flow meter 24 Product stream B is supplied. The jet pump 11 is such arranged that the product stream B above the level 25 of the starting product A reaches the storage container 1.

The partial stream C of the product stream B is through a connecting line 26 to a density measuring device 27 with a upstream shut-off valve 28 out. In dependence of the measurement result of the density measuring device 27 reaches Partial flow C via a flow meter 29 the processing point 13 or via a return line 30 the reservoir 1.

2, the jet pump 11 is for the product stream B. assigned a metering jet pump 31 for a partial product stream D. The product stream B reaches via a shut-off valve 32 provided supply line 33 a propellant nozzle 34. Here the product stream B is mixed with air or Gas 35 instead of the open entered in the jet pump 11 becomes. The jet pump 11 is followed by a diffuser 36, which opens into the mixing reactor 4.

In the metering jet pump 31, the partial product stream D is included the foam agent 18 and the compressed gas 22 intimately mixed, after which he also via the feed 37 in the mixing reactor 4 arrives.

The mixing reactor 4 in turn becomes a product stream B in the reservoir 1 and a partial stream C to the processing point 13 headed.

The method is carried out using a truck mixer the starting product A, consisting of cement and water, delivered that over the protective sieve 2 in the reservoir 1 arrives. In a mixing phase of the product stream B the shut-off valve 28 for the partial flow C is closed and the product stream B is supplied with foam agent 18, Compressed gas 22 and atmospheric air are pumped into the circuit and mixed in the process. Here, the product stream B by means of the feed pump 3 removed from the reservoir 1, through the pipeline 6 provided with mixing elements to the mixing reactor 4 transported and via the jet pump 11 into the reservoir 1 headed.

The shut-off valve opens after the mixing phase 28 and the partial flow C flows through the density measuring device 27. Does the measurement result meet the requirements for Foam mass, the partial flow C via the flow meter 29th fed to the processing station 13. If the measurement result does not meet the requirements for the foam mass the partial flow C via the return line 30 into the storage container 1 initiated, after which further mixing takes place. During the removal of the partial stream C, the product stream B promoted in the cycle described above.

Using this process, a foam mass is produced from 3.8 m ^{3 of} starting product A with a density between 1500 and 2500 kg / m ³ , which after a mixing phase of 60 seconds has a density between 100 and 1000 kg / m ³ with a uniformly distributed pore structure.

LIST OF REFERENCE NUMBERS

A

starting product

B

product flow

C

partial flow

D

Partial product stream

1.

reservoir

Second

protective screen

Third

feed pump

4th

mixing reactor

5th

tube

6th

pipeline

7th

Inlet

8th.

inner wall

9th

mixing element

10th

Jogger

11th

jet pump

12th

leaving

13th

processing Agent

14th

outlet

15th

Feinschutzsieb

16th

shut-off valve

17th

entrance

18th

foaming agent

19th

metering

20th

flowmeter

21st

Inlet

22nd

compressed gas

23rd

metering

24th

flowmeter

25th

level

26th

connecting line

27th

density measuring

28th

shut-off valve

29th

flow meter

30th

return

31st

Dosierstrahlpumpe

32nd

shut-off valve

33rd

supply

34th

propelling nozzle

35th

gas

36th

diffuser

37th

feed

Claims (21)

1. Method for producing foaming substances, especially foaming cement substances, which substantially comprise a starting product (A), especially cement paste, and a foaming agent (18), in a mixing reactor (4) connected via a feed pump (3) to a supply container (1) for the starting product (A), characterised in that a product flow (B) taken from the mixing reactor (4) is conveyed in a circuit via a jet pump (11) to the supply container (1) which is kept at a minimum level, foaming agent (18) and atmospheric air being added, a partial flow (C) being removed for processing from the product flow (B) after a mixing phase, and the foaming agent (18) being mixed into the product flow (B) in the jet pump (11).
2. Method according to claim 1, characterised in that a compressed gas (22) is mixed into the product flow (B).
3. Method according to claims 1 and 2, characterised in that the compressed gas (22) is mixed into the product flow (B) in the jet pump (11).
4. Method according to one of claims 1 to 3, characterised in that the amount of the foaming agent (18) mixed into the product flow (B) and/or the amount of compressed gas (22) is measured and regulated.
5. Method according to one of claims 1 to 4, characterised in that the foaming agent (18) and/or the compressed gas (22) are/is conveyed from a metering pump (19, 23) through a flow-meter (20, 24) to the jet pump (11).
6. Method according to claim 1, characterised in that the partial flow (C) flows through a density measuring device (27).
7. Method according to claim 6, characterised in that the density of the partial flow (C) is determined by volumetric or gravimetric means.
8. Method according to claims 6 and 7, characterised in that the partial flow (C) is led in dependence on the result of the density measurement to the processing location (13) or to the supply container (1).
9. Device for producing foaming substances, especially foaming cement substances, which substantially comprise a starting product (A), especially cement paste, and a foaming agent (18), having a mixing reactor (4) connected via a feed pump (3) to a supply container (1) for the starting product (A), in particular for accomplishing the method according to claim 1, characterised in that the mixing reactor (4) has an exit (12) for a product flow (B), leading to a jet pump (11), an outlet (14), leading to a processing location (13), for a partial flow (C) of the product flow (B) and an intake (7) for the product flow (B) from the supply container (1), the product flow (B) emerging above the filling level (25) of the supply container (1) from the jet pump (11), which is provided with an entrance (17) for the foaming agent (18), and at least one static mixing element (9) being disposed inside the mixing reactor (4).
10. Device according to claim 9, characterised in that at least one fine protective screen (15) is fixed inside the mixing reactor (4).
11. Device according to claim 10, characterised in that the fine protective screen (15) is disposed in front of the exit (12) for the product flow (B), the exit (12) for the product flow (B) being located on a side of the mixing reactor (4) opposite the intake (7) for the product flow (B).
12. Device according to one of claims 9 to 11, characterised in that the mixing reactor (4) is connected to an external shaking device (10).
13. Device according to claim 9, characterised in that the mixing reactor (4) is connected to the supply container (1) via a pipeline (6) and a hose (5) with the interposed feed pump (3).
14. Device according to claim 13, characterised in that the pipeline (6) is provided in its interior with at least one mixing element.
15. Device according to one of claims 9 to 14, characterised in that the jet pump (11) is provided with an intake (21) for the compressed gas (22).
16. Device according to one of claims 9 to 15, characterised in that there is associated with the jet pump (11) in each case a metering pump (19, 23) to supply the foaming agent (18) flowing through a flow-meter (20, 24) and/or the compressed gas (22).
17. Device according to claim 9, characterised in that a connecting line (26) with an interposed density measuring device (27) is associated with the outlet (14) for the partial flow (C) of the product flow (B).
18. Device according to claim 17, characterised in that the connecting line (26) is provided with a quantity meter (29) connected downstream of the density measuring device (27).
19. Device according to claims 17 and 18, characterised in that the density measuring device (27) is connected to a return line (30) which leads to the supply container (1).
20. Device according to one of claims 9 to 19, characterised in that the supply container (1) is covered with a protective screen (2).
21. Device according to one of claims 9 to 13, characterised in that there is associated with the jet pump (11) for the product flow (B) a metering jet pump (31) for a partial product flow (D), which leads the foaming agent (18) and/or the compressed gas (22) to the partial product flow (D), after which the partial product flow (D) reaches the mixing reactor (4).

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