EP0925892A1 - Method and mixer for producing coloured masses of mortar - Google Patents

Abstract

A vertical, tubular mixer barrel has a central axial rotating shaft extending down its full length from a top mounted drive (17), and coupled at the bottom end to the spiral rotor of a vertically arranged progressing cavity pump (4). Dry mortar is fed from a hopper (3) into the upper section (1.1) of the mixer barrel and undergoes preliminary dry mixing, to ensure homogeneity, under the action of a combination screw and paddle flights attached to the shaft. The plug of dry mortar passes down the barrel and a controlled flow of water is added through an inlet (1.3) and the mortar undergoes mixing the wet section (1.3) before entering the progressing cavity section (4) to be pumped through a finishing mixer (5) and discharged via a hose (6). Liquid colorant, from a container (12) is either sucked into the mixer water feed via a venturi device (7) or into the progressing cavity pump via a bore (4.2) in the stator casing (4.1).

Description

The invention relates to a method for continuous Manufacture of pumpable, colored mortar compounds in one Mixer, the dry mortar and a metered water flow are fed and in the continuously liquid paint is metered in, and mixer to carry out the method.

DE 43 18 177 A1 describes a method and a mixer for the continuous production of pumpable mortar compounds known on the construction site. With the mortar masses it can be especially spray plaster or liquid screed. To the mixer produces an appropriate dry mortar mixture as well as the required, using a flow controller constant amount of water continuously fed. The mixer essentially consists of one Mixing tube containing a mixing shaft with mixing blades and in the area of its one end the dry mortar and in its further course via a water supply line the water is fed. A screw pump is arranged downstream of the mixing tube.

If when using such a mixer e.g. the spray plaster or the liquid screed needs a specific color is used, a dry mortar mixture that the contains corresponding color pigments. Therefore, the manufacturer must Dry mortar mixtures in a number of colors ready or mixed. The former conditional cost-intensive storage, the latter increases Manufacturing costs and requires an additional, time consuming and expensive mixing process.

It has therefore already been tried, the color at Manufacture of the processable mass added. The DE 27 04 391 A1 shows a mixer operating according to the method works from which the invention is based. The well-known mixer is especially for the production of pumpable gypsum determines and includes a mixing tube in the area of its upper end of dry matter and in the further course water is supplied laterally via a connecting piece, and a pump downstream of the mixing tube. At the connector opens up a complex water supply device, that of a clear water supply circuit and a color water supply circuit exists in the clear water feed circuit flows so that clear water and color water are mixed and the mixture thus obtained flows into the mixing tube. The color water supply circuit in turn includes upstream of the muzzle an electrically controllable valve, a flow circuit with a pump for color water from a container and a feedback loop. This elaborate and complicated The way of producing pumpable colored building materials has changed After this knowledge, do not enforce in practice can.

In another context, namely in the manufacture of Concrete, it has long been known from DE 29 18 451 A1, Admixtures, especially air entraining agents and plasticizers, using a water jet pump in the Add mixing water. This technique is however Production of colored mortars never considered been. Rather, so far, with colored dry matter, worked as described above.

The invention has for its object a method and a mixer for quick and inexpensive delivery to create usable colored mortar compounds.

According to the invention, this task is the one mentioned in the introduction Process solved in that the liquid paint on is metered in at a point where it is operational lower than atmospheric pressure.

This eliminates the above-mentioned disadvantages of the known Method. Instead, it is only a construction site comparatively small container with liquid paint in the required sound. Another advantage of the proposed The procedure is that the desired one Color selected on site, adjusted and in If necessary, can also be changed. So just need it a few basic colors to be kept ready. Of the each desired tone can be changed by changing the Mortar mass metered amount of paint, by mixing different liquid colors and / or by diluting the change liquid color in wide areas. Suitable liquid Colors, usually based on inorganic color pigments, are commercially available. There is no need for a separate one Pump for dosing the color, which is rather from the Self-priming storage container is removed.

The liquid paint is preferably metered into the water stream. The resulting dilution before discharge in the mixer leads to a particularly even color the mortar mass produced.

After further training, the speed of the Water flow at at least one point to generate a static vacuum increases and at this point the liquid Color fed. It is obvious that the difference in height between the place where the liquid paint enters the water flow and the installation site of the Paint container affects the metered amount of paint. That's why In extreme cases, a measure to increase the Speed of water flow can be dispensed with, namely then when the paint container is sufficiently high above the point the initiation of color arranged in the water flow and at the same time it ensures that the of the container line leading to the discharge point, usually a Hose, at the beginning of the mixing process with liquid paint is filled and one to be operated when the mixer is at a standstill Shut-off valve contains. Also a list of the Container so that its content is about liquid color located at the point of discharge is to save the Shut-off valve conceivable.

Alternatively, the paint can be added to the mixer screw pump be dosed. In the upstream part of the screw pump operationally there is a lower than atmospheric pressure. At this point there is in the case of Air entrainer pumps the air inlet. This air intake can be used to dose the liquid paint. Instead, another inlet can be located at a suitable point be provided in the form of a bore. In this case it sucks the mixer screw pump both air and paint on.

Basically with a mixer of the above known from DE 43 18 177 A1 is that of the invention underlying task solved in that in the water supply a liquid paint-sucking dosing device is arranged for metering the liquid paint.

The metering device can in particular be a liquid Color-sucking Venturi nozzle.

Alternatively, the metering device can be a liquid Be a paint suction water jet pump.

As a result, the water supply has a cross-sectional constriction on, with the liquid paint downstream of the cross-sectional constriction taking advantage of one of the water streams generated negative pressure metered directly into the water flow becomes.

Of course, the metering device can also be a liquid paint sucking, preferably electrically powered Be a pump. This embodiment is more complex than the aforementioned self-priming embodiments, but especially when using a Dosing pump has the advantage that even more viscous, liquid Colors can be metered into the mixer. Furthermore In this way, a particularly high dosing accuracy can be achieved and thus achieve color consistency, regardless of that Location of the paint container as well as the length and the cross section the line supplying the paint.

The metering device is preferably a replaceable unit educated. Especially when the dosing device a Venturi nozzle or a water jet pump, it can as a short intermediate piece between the mixer-side water connection and that coming from the water metering device Line, usually a hose, be formed. In is usually the connection between the water hose and the mixer-side water connection designed as a quick coupling. Therefore, existing, conventional mixers can be used of almost any design can be carried out quickly and easily of the method according to the invention or in a mixer Convert to produce colored mortar compounds. Another Advantage of this embodiment is that a number of calibrated to different color throughput quantities Dosing devices kept ready and depending on the desired Tint or color intensity of the mortar mass produced can be used or replaced. This avoids a complicated mechanism of the dosing device and lengthy Adjustment work and test runs with different Dilutions of the liquid color of the chosen fundamental.

Also with a mixer which is basically from DE 43 18 177 A1 known type is the basis of the invention lying task alternatively solved in that the coat the screw pump has a hole to which a feed line for liquid paint and is connected to the snail room opens and this hole at one point in the Snail chamber opens, on the operationally a lower than the atmospheric pressure prevails. This will make the liquid Color sucked in automatically.

The liquid can be used to fine-tune the color Color leading supply line a valve for setting the Flow can be arranged.

To avoid color fluctuations after standstills the mixer it is expedient that the liquid color leading supply line in the area of their intake opening a check valve, especially if one of the proposed self-priming dosing devices is used.

In all embodiments, the method and the Mixer according to the invention has the advantage that the metering the color takes place automatically when the mixer is in operation is. When using a metering device in the form of a electrically powered pump can do this very easily the machine control can be achieved. In the self-priming In contrast, embodiments are not further measures required because when the machine is at a standstill the negative pressure used to dose the color breaks down. In addition, the self-priming embodiments have the advantage that the metered amount of liquid Color automatically to the respective volume flow either of mortar mass (if dosed into the screw pump ) or in water (if dosed into the water flow is adjusted) because the one prevailing at the metering point Vacuum changes in the same direction as Change in the respective volume flow.

As is clear from the rest, the procedure can be followed the invention also for metering in other means than liquid paint can be used. Consider in particular Air pore agents, plasticizers, adhesive additives, Foaming agent or other chemicals or mixtures of substances in liquid form, especially if the required amount to be proportioned to that Amount of water to be added is dry mortar.

Fig. 1

eine teilweise im Schnitt gehaltene Seitenansicht des Mischers und

Fig. 1a

eine alternative Dosiervorrichtung.

In the drawing, a mixer for carrying out the method according to the invention is shown schematically simplified in an embodiment selected, for example. It shows:

Fig. 1

a partially sectioned side view of the mixer and

Fig. 1a

an alternative dosing device.

In the drawing is an example of a standing worker Mixer for the production of spray plaster depicted this however only on behalf of others, also lying or mixers working at an angle e.g. for production of Self-leveling screed or masonry mortar.

The mixer comprises a mixing tube 1 with a mixing shaft 2 basically any training in the area of his top of a funnel 3 charged with dry mortar becomes. On the upper section 1.1 of the mixing tube, in which the dry mortar is homogenized while dry is followed by a lower section 1.2, in its initial area there is a water connection 1.3.

At the bottom of the mixing tube is a conventional one Screw pump 4 flanged, namely here in the embodiment as an air-entrained screw pump, whose screw casing 4.1. accordingly has an air connection 4.2. The worm shaft 4.3 is via a dog clutch with the mixing shaft 2 connected and in turn drives the shaft on the output side 5.1 of a post-mixer 5, which is however optional. From the final mixer 5 goes to the finished mortar mixture Hose 6 transporting the place of use.

All shafts are driven by a common drive motor 17 driven with a downstream reduction gear.

At the water connection 1.3 is a schematically indicated Quick coupling a paint metering device 7 connected, which according to the well-known principle of the Venturi tube is working. To the other side of the paint metering device also the end of a water hose via a quick coupling 8 connected via which the mixer from one upstream, usual and therefore not shown water metering device one according to the pump output and the desired plasticity set mortar mass Amount of water is fed continuously. The Ink metering device 7 has a venturi nozzle Cross-sectional constriction in which the bore of a connection 7.1 opens, to which a paint hose 9 is connected which is a symbolically illustrated pinch valve 10 sits. The hose 9 leads to an immersion tube 11 in one liquid paint containing container 12. At the bottom of the Dip tube 11 is a check valve 13.

An equivalent ink metering device 14 is shown in Fig. 1a shown. It works according to the well-known principle of Water jet pump.

Instead of the color metering devices 7 in FIGS. 1 and 14 in 1a can also the screw pump 4 as a metering device to be used. In this case the water hose 8 is direct connected to port 1.3 while the paint hose 9, as shown in dash-dotted lines, over a suitable one Intermediate piece (not shown) to the hole 4.2 is connected in the screw shell 4.1.

When the mixer is in operation, the Paint metering device 7 or 14 flowing water stream at the port 7.1 one of the flow rate of the Water at the narrowest point of the paint metering device Negative pressure generated. This will over the paint hose 9 sucked liquid paint from the container 12. Of the Color flow, i.e. the amount of color metered in per time unit, depends on the water flow in the water hose 8, i.e. the set amount of water per unit of time, from. In addition, the color flow can be adjusted of the pinch valve 10 are changed. Will the Mixer is shut down via the electrical machine control and a solenoid valve (not shown) as well the water inlet is shut off. Inevitably and at the same time this will result in the dosing of liquid paint from the container 12 interrupted. If the mixer starts again, the following applies the reverse. This ensures that the manufactured Mortar mass regardless of business interruptions the mixer always has the same color. Especially with Application of spray plaster is known to be repeated Interruptions and thus stoppages of the mixer are inevitable.

If the liquid paint is not fed into the mixing water stream but is metered into the screw pump 4, basically the same applies. However, it is recommended then for a more even distribution of the color in the mortar the use of the drawn post-mixer 5.

Claims (12)

Process for the continuous production of pumpable mortar masses in a mixer, to which dry mortar and a metered water stream are fed and into which continuously liquid paint is metered in, characterized in that the liquid paint is metered in at a point at which the operating pressure is lower than atmospheric pressure. A method according to claim 1, characterized in that the liquid paint is metered into the water flow. A method according to claim 2, characterized in that the speed of water flow at least a place for generating a static vacuum increased and at this point the liquid color is fed. A method according to claim 1, characterized in that the liquid paint into the mixer screw pump is dosed. Mixer for the production of pumpable mortar compositions from dry mortar and water, with a mixing tube (1) which contains a mixing shaft (2) with mixing blades and which in the area of one end (1.1) of the dry mortar and in its further course via a water supply line (8) water is fed and with a screw pump (4) arranged downstream of the mixing tube (1), in particular for carrying out the method according to one of claims 1 to 3, characterized in that in the water supply line (8) a liquid paint-sucking metering device (7, 14) for Dispensing the liquid paint is arranged. Mixer according to claim 5, characterized in that the dosing device sucks the liquid paint Venturi nozzle (7). Mixer according to claim 5, characterized in that the dosing device sucks the liquid paint Water jet pump (14). Mixer according to claim 5, characterized in that the dosing device absorbs the liquid paint, is electrically powered pump. Mixer according to one of claims 5 to 8, characterized in that that the dosing device as replaceable Unit is formed. Mixer for the production of pumpable mortar compositions from dry mortar and water, with a mixing tube (1) which contains a mixing shaft (2) with mixing blades and which in the area of one end (1.1) of the dry mortar and in its further course via a water supply line (8) water is supplied, and with a screw pump (4) arranged downstream of the mixing tube (1), in particular for carrying out the method according to claim 1 or 4, characterized in that the jacket (4.1) of the screw pump (4) has a bore (4.2) which is connected to a feed line (9) for liquid paint and which opens into the screw chamber, and that the bore (4.2) opens into the screw chamber at a point where the operating pressure is lower than the atmospheric pressure. Mixer according to one of claims 5 to 10, characterized characterized in that leading the liquid color Supply line (9) a valve (10) for setting the Flow is arranged. Mixer according to one of claims 5 to 11, characterized characterized in that the liquid color leading supply line (9) in the area of their intake opening with a Check valve (13) is provided.

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