AT523413B1 - Plant for the production of a mineral foam - Google Patents

Abstract

The invention relates to a system for generating a mineral foam, comprising a metering device (3) for solids, a slurry mixer (1) for mixing the solids and a mixing liquid to form a slurry, at least one foam generating device for providing a foam, a foam mixer (2) for mixing of the slurry and the foam to form a mineral foam, the slurry mixer (1) and the foam mixer (2) being designed as continuous mixers and the system comprising a system for water treatment, the system for water treatment being that for the slurry mixer (1) and the at least one Provides the water required for the foam generation device separately, the temperature of the water for the slurry mixer (1) and the at least one foam generation device being adjustable, controllable or regulatable independently of one another.

Description

description

The invention relates to a continuous mixing system which is used to mix powdery and / or granular solids with a liquid to form a slurry (pulpy mass) and to foam this slurry into a mineral foam and pump it to the filling location.

The advantages of the continuous mixing plant according to the invention are especially valuable when the foamed slurry produced therewith is a self-hardening mass, in particular a rapidly hardening mass, for example a mineral formulation such as foamed concrete or a foamed mineral thermal insulation material.

A problem with mixing powdery and / or granular solids with liquid to form a self-curing foamed slurry is that the slurry and foam must be thoroughly mixed and transported gently to the filling location so that the foam structure is not destroyed.

Another problem is that after the discharge from the mixer has ended, a residue of slurry remains as an adhesion in the mixer and hardens there, unless the mixer is cleaned promptly. By using a continuous mixer, with the help of which one can mix continuously over a longer period of time - and not having to mix in individual separate batches with downtimes in between - the cleaning effort is reduced, but here too, after the discharge has taken place or in the event of an unscheduled If the mixer is stopped, cleaning can be carried out.

Typical continuous mixers for the production of self-hardening slurry from powdery and / or granular solids and water have a conveying device and a mixer, the conveying device continuously moving the solids through an opening into the chamber of the mixer, with at least one additional opening Liquid is introduced into the chamber of the mixer, the mixer mixing continuously and the slurry continuously forming in the mixer flowing continuously out of the mixer through a further opening. There are many methods and devices known from the prior art for adding a foam component or compressed air to the slurry in order to obtain a foamed or air-entrained building material.

DE 19843777 (C1), EP0120812 (A2) and WO9615889 (A1) show devices for mixing a slurry.

CN209755551 (U), CN203449434 (U) and CN201249476 (Y) describe devices for producing and pumping foam concrete from concrete.

DE102019122041 (A1) describes a system for mixing a lightweight construction mixture of binder and bulk material and forcing the lightweight construction mixture to be conveyed by means of compressed air.

DE 3100443 A1 shows a continuous mixer for concrete or foam concrete, in which the solids are transported via a screw conveyor from the bottom of a loading container into the chamber of a horizontally arranged mixer. Mixing water is added in the front part of the mixer and the slurry is mixed. Then foam is added in the rear part of the mixer and mixed into the slurry.

DE 3629674 A1 and WO 2011044604 show similar continuous mixers, although the screw conveyor and mixer rotor do not have a common shaft and can be driven separately from one another. This means that the mixer can be emptied if only the screw conveyor and the other material supply are switched off. When cleaning the mixer, which usually takes place by spraying cleaning liquid into the mixing chamber, cleaning liquid can also reach the conveyed material located at the mixer-side end region of the screw conveyor and form a self-hardening mass with it.

WO 2011106816 A1 shows a mixing system for producing a mineral foam, in which a flowable slurry is mixed in a first mixing section, which in a

second mixing section is mixed with foam. As far as can be inferred from the general description of the system, both mixing sections are arranged horizontally and there is no eccentric screw pump.

EP 1065033 A-2 shows a continuous mixer in which the powdery and / or granular solids are introduced from above into a vertical mixing chamber and not from one side into a horizontally arranged mixing chamber as in the aforementioned documents. An eccentric screw pump is connected to the lower end of the mixing chamber, which is used to transport the slurry to the place of use. When the mixer is cleaned by sprayed-in liquid, the risk of liquid reaching powdery and / or granular solids that are not yet in the mixing chamber and forming a hardenable mass with them is thus somewhat reduced. Due to the design, in particular the vertical alignment of the material flow through the mixing chamber and the directly following delivery by the pump without an intermediate container, the amount of slurry produced can be set over a wide range and the amount of slurry in the system can be reduced.

DE 2437231 A1 shows a vertical mixer which has an eccentric screw pump at the lower end. In the middle of the eccentric screw pump, which is preferably designed in two stages, compressed air is added to the slurry. On the output side, the eccentric screw pump is followed by a vortex chamber in which a rapidly rotating tool continues to mix the slurry mixed with compressed air. The disadvantage is that the agitator is mounted vertically in the vortex chamber and rotates quickly, which means that the mixing section in the vortex chamber is limited to the diameter of the agitator and the brief, vigorous mixing can have a negative impact on the structure of the air pores.

DE 3807250 A1 shows a continuous mixer for mixing a slurry and a foam component. The mixer is fed with slurry via the hose line of a concrete pump, with the foam also being injected into the mixer. The disadvantage is that a premixed slurry is used, which is transported to the storage tank of a concrete pump and from there via a hose line to the mixer. The device shown is therefore suitable for use on a construction site in which a certain distance has to be overcome between the pump and the place of use. This device is unsuitable for the production of prefabricated components such as thermal insulation panels from rapidly hardening foamed slurry.

DE 4408088 A1 shows a method for producing a porous mineral light insulation board. A slurry is mixed in a first mixer, which enters an intermediate container and is transported away by a pump via a line. The line of the slurry and the line of the foam component are combined via a Y-shaped branched mixing tube and homogenized by a static mixer. A static mixer has no rotating parts. The mixing takes place through static obstacles, which cause turbulence in the components. The disadvantage is that the mixing in the static mixer cannot be adapted to a variable delivery rate. In addition, cleaning the static mixer turns out to be difficult, since material cannot be discharged from the static mixer when the pump is at a standstill. In addition, a rapidly hardening compound tends to stick to the complexly shaped obstacles in the static mixer, with areas behind the obstacles being difficult to clean even with water which is pumped through the static mixer under pressure.

EP3145687B1 (also published as WO2015176092A2) by the applicant shows a continuous mixing system comprising a vertical mixer and a horizontal mixer, which continuous mixing system is designed to allow good mixing of the slurry and foam and adhesion of hardening material in the system to prevent or reduce. The continuous mixing plant is a complex device, the construction and commissioning at the place of use being associated with a corresponding effort.

An object on which the invention is based is to further improve a continuous mixing plant with regard to foam quality and / or operational stability.

The object is achieved with a system according to claim 1 and a method according to claim 17.

The solution according to the invention consists in the separate water treatment for the mixing water of the continuous mixer and the water of the foam cannon.

Preferably, the water supply from a source is divided into two strands for the water treatment for the mineral foam mixing plant. The division takes place in one line for the mixing water for the slurry and one line for the water for foam generation. In both strands, the amount of water can preferably be adjusted independently of one another. The amount of water is preferably controlled or regulated by a device or control system. In both lines, the temperature of the water can be set independently of one another. The temperature of the water is preferably controlled or regulated by a device or control system.

A preferred embodiment variant is that the system according to the invention is designed as a so-called plug-and-play unit, which is housed in a container, preferably in a modified commercially available steel container, in particular in a 15-foot container. Preferably, the container is only to be connected to a water and an electricity connection at the place of use in order to be ready for use. The container is in particular a transport container, which means that the system according to the invention is transported to the place of use in the container. The system is operated in the container in which it is transported and is permanently installed in this.

The following components are preferably contained in the container: - Water treatment - Dosing device for solids

- Continuous mixer for the production of a slurry from the solids and a mixing liquid (slurry mixer)

- Foam cannon

- Continuous mixer for mixing the slurry and foam (foam mixer)

- Pump for pumping the foamed slurry to the place of use (feed pump) [0023] The container preferably also comprises one or more of the following components:

- Container for the foamed slurry, which container is arranged between the continuous mixer for mixing the slurry and the foam and the pump for pumping the foamed slurry

- Stripping pipe, between the container for the foamed slurry and the continuous mixer for mixing the slurry and the foam

- Containers for additives, which additives are introduced into the mixing process, for example by means of suction lances / pumps

- Big bag holder

- Switch cabinet

- Operating or control element

- Switching valve after the pump for pumping the foamed slurry

The solids in the form of a cement matrix are preferably supplied in big bags for the system in question. The solids are preferably provided (semi-) automatically to the slurry mixer or the dosing device for solids with the help of a big bag holder. Under the

Bigbag holder is preferably a funnel, at the lower end of which the metering device is arranged, which feeds the slurry mixer.

The big bag holder, the dosing device and the two mixers are preferably attached to a common support frame which extends vertically through the entire container. The support frame can preferably have feet which extend below the container floor. This can advantageously be used to level the container.

The container can have rollers or can be placed on rollers in order to make it displaceable.

The support frame preferably has upper fastening elements which extend over the container roof and on which the big bag holder can be placed. The big bag holder is preferably releasably attached to the fastening elements in order to be able to be removed for the transport of the container.

The roof of the container has an opening in which the funnel is present, at the lower end of which the metering device is arranged. A device for cutting open a big bag is preferably arranged in the funnel.

The big bag is preferably hung with its carrying loops at the top on a suspension that can be removed from the big bag holder. The uprights of the big bag holder are mounted on steel springs, which means that the big bag is lowered by its own weight and is automatically raised when material is removed. In the funnel there is preferably a knife pyramid which cuts open the big bag.

By using contactors, contact sensors, position sensors, or position sensors on the uprights, it is possible to measure the filling level of the big bag by moving the big bag up and down. As soon as the big bag is empty, it can be replaced, whereby the system continues to operate with the bulk material in the hopper.

In order to prevent the development of dust, a rubber lip is preferably mounted in the funnel, which surrounds the big bag.

The necessary additives are preferably supplied in barrels / canisters and introduced into the mixing process via suction lances / pumps.

The manual control is preferably carried out from outside the container, preferably via an operating or control element that is present on the container, but is accessible from outside the container. The operating or control element can preferably be pivoted, preferably between a first position which is located in the container and a second position which is at least partially outside the container. A switch cabinet or a control system for controlling the automated components of the system can advantageously be located in the container.

The control element is preferably locked in the position outside the container and can only be pivoted into the interior of the container by an authorized person, such as a service technician. For this purpose, the operating element or the swivel element can be provided with a lock or similar locking mechanism.

In this way, a safe working environment can be guaranteed for the workers performing the work.

For the water treatment for the mineral foam mixing plant, the water supply from a source is preferably divided into two strands. The division takes place in one line for the mixing water for the slurry and one line for the water for foam generation. In both strands, the amount of water can preferably be adjusted independently of one another. The amount of water is preferably controlled or regulated by a device or control system. In both lines, the temperature of the water can be set independently of one another. The temperature of the water is preferably controlled or regulated by a device or control system.

The water or liquid source can be a line connection or a water reservoir of the system in question. The water storage tank can be filled at time intervals or continuously via a line connection, or it can be topped up by means of a tanker.

The water treatment system preferably comprises a pressure increasing pump in order to guarantee constant pressure and water quantity in the system. The pressure increasing pump is preferably arranged after the water source and before the division into the two lines.

The water treatment system preferably comprises a pipe separator which separates the supply line from the machine in the event of a pressure drop.

The water treatment system preferably comprises a cold water filter in order to avoid contamination of the system with solids.

The water treatment system preferably comprises at least one flow heater. The water treatment system can alternatively or additionally comprise at least one hot water tank (storage heater).

The water treatment system, in particular the flow heater, preferably enables different water temperatures for slurry preparation water and foam water, which subsequently influences the tightening and setting behavior of the mineral foam. This makes it possible to guarantee the same warm-up times for the mineral foam despite temperature fluctuations in the ambient air. If the ambient temperature is cold, warmer water is used. If the ambient temperature is warmer, colder water is used.

The temperature of at least one strand, preferably both strands, is preferably set, controlled or regulated as a function of the ambient temperature.

The hot water can be prepared after dividing the water into the two strands, in that each (or at least one) strand has a flow heater or storage heater.

The hot water preparation can also take place before the water is divided into the two strands, each (or at least one) strand having a mixer tap which has a connection for hot water and a connection for cold water.

With the mixer tap can advantageously set, control or regulate the temperature and amount of the water of the respective line.

The water treatment system preferably also comprises a hot water filter in order to prevent the system from being soiled by lime loosening on the flow heater or on the storage heater.

The water treatment system preferably also comprises at least one thermostat in order to enable the water temperature to be set.

The foam mixer preferably includes a mixing tube, as known from EP3145687B1.

In order to increase the delivery rate of the mixing system compared to the mixing system of EP3145687B1, it is proposed that the mixing tube be equipped with a second inlet for a foam cannon. This is preferably on the upper side, offset radially by approx. 90 ° to the first foam cannon inlet, which is located on the side of the mixing tube.

The system in question preferably has two foam cannons. The foam cannons are preferably each connected to the mixing tube of the foam mixer.

A stripping tube is preferably present between the container for the foamed slurry and the foam mixer.

The stripping tube is used to enable a transition between the mixing tube and the container for the foamed slurry, in particular in the form of a pump funnel.

The scraper tube preferably has an external toothed ring which is driven by an electric motor. In addition, the stripping tube comprises - preferably on the top - an internal stripping element, preferably in the form of a rubber lip. By rotating the scraper tube around its own axis, the inside is continuously stripped from the scraper element, thus avoiding packings in the scraper tube. Stripped material falls down onto the mineral foam moving in the lower area of the stripping tube and is transported with it to the inlet of the feed pump.

Preferably the system comprises a foam destruction lance which is used to reduce the waste volume of the mineral foam. This destruction of the foam pores is achieved by one or more air nozzles, which are mounted in a pipe section in a radial direction and directed towards the center of the pipe.

This foam destruction lance is either mounted at the end of its own hose line, or it is designed as a destruction station on an additional waste container into which the filling lance is inserted.

In another embodiment variant, the foam is destroyed by mechanical elements, preferably by rotating mechanical elements, for example by an impeller pump.

The system preferably comprises a switchover valve, in particular in the form of a 2-way valve. This valve is used to enable the use of only one pump to move the mineral foam on the one hand through the production hose line to the filling station and on the other hand to convey the mineral foam through the destruction hose line when the system is idle.

The valve preferably consists of two plastic plates which are connected to one another by an axis. The plate on the output side is screwed firmly to the container or the support frame and equipped with two hose nozzles (production and destruction hose line).

The input side is provided with a hose nozzle and a toothed ring. The ring gear is required to enable a rotation of the hose nozzle by means of a drive in order to connect the hose nozzle on the inlet side to either the production line or the destruction line. A water nozzle, which is used to flush the destruction line when it is not in use, is preferably mounted on the plastic plate on the inlet side.

The production line is preferably designed as a hose line at least in one section and leads to a filling device.

Preferably, the filling takes place in a concrete shell for the production of thermally insulated prefabricated building elements.

The filling device preferably comprises a peeling bridge. While the mineral foam is being applied to the concrete shell, the foam is smoothed and leveled directly with a pull-off element, in particular a plastic broom. The puller element is attached to a bridge via a rotatable shaft and can preferably be rotated by means of a radio signal.

The axle is mounted on a "trolley" in order to be able to operate the entire length of the bridge.

Depending on the required insulation thickness, the height of the pull-off element can be adjusted and fixed in relation to the concrete shell.

The bridge itself preferably runs on rails on the table or can, depending on requirements, also run over a wall or ceiling system. One side can be guided on rails, the second side can be designed with free-running rollers.

For parts of the present continuous mixing plant, it is preferred if they are in accordance with

the continuous mixing plant of EP3145687B1. In order to identify these known device parts in the description, the relevant paragraphs of the description are preceded by the phrase “as known from EP3145687B1”.

As known from EP3145687B1, solids and the mixing liquid are preferably mixed in a first vertically arranged mixer to form a flowable slurry, with an eccentric screw pump being attached to the lower end of the vertical mixing chamber, which directs the premixed material from the first mixing chamber under pressure conveys into the starting area of a second mixing chamber, the second mixing chamber preferably being arranged at least approximately horizontally and having a rotating, horizontally arranged elongated mixing tool. Via a foam gun, the foam component is also conveyed under pressure into the starting area of the horizontal mixing chamber, the slurry and the foam being moved through the horizontal mixing chamber, the mixing tool gently adding the foam component to the slurry. The amount of slurry and foam is preferably selected so that the conveyance through the horizontal mixing chamber takes place mainly through the higher volume flow of the foam.

As known from EP3145687B1, the solids can be supplied by a screw conveyor which continuously conveys the solids from the lower end of a storage container to the upper end of the vertical mixer.

As known from EP3145687B1, the mixing tool of the horizontal mixer can consist of an elongated shaft on which elastically deformable mixing elements, preferably made of high-strength steel, are attached. These mixing elements are exposed to bending forces and vibrations during operation, which results in a change in shape of the flexible spring steel, which causes caking to loosen. This is particularly advantageous if the solids do not contain any coarse-grained particles which would otherwise contribute to the dissolution of caking.

As known from EP3145687B1, the ends of the mixing elements are preferably in contact with the inner wall of the mixing chamber, so that they constantly strip off the material adhering to the inner wall during operation. The mixing elements can be designed in such a way that all surface areas of the inner wall are stripped off with one rotation of the mixing tool. The mixing elements can be made from a 0.5 - 1.5 mm thick spring steel sheet and preloaded against the inner wall of the mixing chamber.

The invention is explained by way of example with reference to drawings relating to preferred design variants:

1: shows the continuous mixing plant known from EP3145687B1 in a partial sectional side view.

[0073] FIG. 2: illustrates a preferred variant of a system according to the invention in a side view.

FIG. 3: illustrates the system according to the invention of FIG. 2 in a view from above.

4: illustrates the system according to the invention of FIGS. 2 and 3 in a perspective view.

5: shows a scraper tube according to the invention in a perspective view. 6: shows the scraper tube according to the invention of FIG. 6 in a longitudinal section. 7: shows a switching element according to the invention in a perspective view.

FIG. 8: shows the switching element according to the invention from FIG. 7 in a further perspective view.

Fig. 9: illustrates the water treatment system according to the invention.

10: shows a filling station suitable for combination with the system in question in a perspective view.

As can be seen in FIG. 1, it is known from EP3145687B1 that the solid powdery to granular solids are conveyed from a storage container with a conveying device 3 into the vertically arranged slurry mixer 1. At the lower end of the slurry mixer 1 there is an eccentric screw pump 4. The slurry mixer 1 has at least one water connection for introducing the mixing liquid, which can consist of water or water with various additives. The water connection is located below the feed opening for the solids, which prevents mixing water from reaching or into the conveying device 3. In the slurry mixer 1, the solids are mixed with the mixing liquid to form a flowable slurry, which passes from the lower end of the slurry mixer 1 directly into the eccentric screw pump 4. The shaft of the vertical mixing tool has a connection to the rotor of the eccentric screw pump 4, so that the shaft and the rotor are driven via a common drive, in particular a motor. The eccentric screw pump 4 pumps the slurry directly into the horizontally arranged foam mixer 2. The slurry enters the mixing chamber from above through the slurry inlet opening in the housing of the foam mixer 2. A foam cannon is used to introduce foam into the foam mixer 2 through a foam inlet opening arranged on the side of the foam mixer 2. The slurry inlet opening and the foam inlet opening are in the front area of the mixer housing. The mixer housing is elongated and preferably has an annular cross section, that is to say is preferably shaped as a horizontal hollow cylinder. In the rear area of the foam mixer 2, the housing has an outlet opening through which the slurry mixed with foam leaves the continuous mixing plant. A horizontal mixing tool is located in the foam mixer 2. This consists of an elongated shaft which is provided with several mixing elements. The shaft can be mounted on both sides of the foam mixer 2 in its housing. The horizontal mixing tool is driven by the motor and thus rotates around its own axis.

The inner lateral surface of the foam mixer 2 is formed by a plastic tube. In order to absorb or transmit the forces and moments occurring in the foam mixer 2, the plastic pipe is accommodated in a preferably three-part housing. The housing has a front section which has an opening for the slurry inlet, a bearing for the horizontal mixing tool and an opening for the foam feed. The housing has a rear section which has a bearing for the horizontal mixing tool. In order to transmit forces and torques between the two sections described, the housing has a central section which, preferably releasably, connects the two sections. The section is preferably formed by a linkage, for example three rods distributed over the circumference of the plastic pipe. The section can preferably have a trough-shaped support for the plastic pipe in order to prevent it from sagging even slightly. In EP3145687B1, a conically widening rubber connection connects to the rear section.

In Fig. 2, Fig. 3 and Fig. 4, the system according to the invention is shown, which preferably has a slurry mixer 1, a foam mixer 2, a conveying device 3 and an eccentric screw pump 4, which, as in FIG. 1 and in EP3145687B1 can be described in detail. The slurry mixer 1 is preferably arranged at least approximately vertically. The foam mixer 2 is preferably arranged at least approximately horizontally. The foam mixer 2 is preferably arranged in a slightly sloping manner, viewed in the direction of transport of the mineral foam. These device elements known from EP3145687B1 are arranged together with further system components in a transport container 5 which is suitable for being transported by truck, train or ship. The transport container 5 is preferably a standard container. The length is preferably between 4 and 6 meters, the width preferably less than 2.5 meters, the height less than 3 meters, in particular less than 2.5 meters.

A support frame 7 is arranged in the transport container 5 and extends over the entire height of the transport container 5. The support frame 7 preferably has four uprights, which are present at the corners of an imaginary rectangle. The posts are connected in the lower area and in the upper area by cross beams. Below the container floor

In one embodiment, feet 6 can be present, which are inserted into the uprights from below. The feet 6 are preferably adjustable in height. The feet 6 can in particular be screwed into a threaded plate. In addition, additional feet can be attached below the corners of the container, or the corners of the container can be supported by supporting beams or wedges in order to relieve the container floor.

In an alternative embodiment, the feet 6 of the support frame 7 are on the container floor and are preferably screwed to this, the container floor being reinforced at least in the area below the feet 6. For this purpose, steel profiles can be welded to the container floor.

The container wall is preferably reinforced with vertical struts, in particular on both sides next to the operating element 17.

The container can be placed on rollers and moved in a known manner with a pulling tool.

In the container floor, hollow profiles are preferably provided which are open on the longitudinal side of the container in order to be able to lift it with a forklift truck. The container is preferably modified so that the spacing between the hollow profiles is made narrower than in the case of a standard container.

The upper ends of the posts can protrude beyond the container roof. Alternatively, the upper ends of the posts can also be arranged flush with the container roof or below and made accessible through openings or a large common opening in the container roof.

The container roof is preferably completely removed so that heat can better escape from the interior of the container. Instead of the container roof, cross struts can be used which connect the side walls.

When the container is being transported, the opening in the roof or the open upper side of the container is preferably closed with a tarpaulin.

A lattice door is preferably used at least on one broad side of the container. Lattice doors are preferably used on both broad sides of the container.

The respective grille door preferably has a contactor or sensor. The lattice doors can preferably only be opened while the system components are at a standstill.

The system preferably has a drive, for example in the form of a lifting cylinder, by means of which the slurry mixer and the foam mixer are decoupled, this drive being actuatable only when the grille door is open in order to be able to separate the two mixers for cleaning the mixing tools .

The motors of the two mixers are preferably pivotably mounted, with these being decoupled from the mixing tools when they are pivoted away. At least one of the motors, in particular that of the slurry mixer, is preferably pivoted with a drive, for example in the form of a lifting cylinder, this drive being actuatable only when the grille door is open in order to be able to separate the motor for cleaning the mixing tools.

In one embodiment variant, at least one of the two mixers, in particular the slurry mixer, has a sensor for detecting the position of the coupling piece of the mixing tool shaft. The motor of the respective mixer is preferably a servo motor. The decoupled motor is preferably controlled as a function of the position of the coupling piece, so that its shaft is aligned as a function of the position of the coupling piece. When moving, in particular pivoting, the servomotor towards the mixing tool, the motor shaft and mixing tool shaft are automatically coupled due to the position detection of the mixing tool and the alignment of the motor shaft.

In another embodiment, the shaft of the decoupled motor is located with a

known alignment before and the mixing tool is aligned according to this alignment before the motor is moved, in particular pivoted, in the direction of the mixer. To achieve this, the motor can always be stopped in the same position or orientation of its shaft when it is switched off. The alignment of the mixing tool (which has been removed, cleaned and reinserted, for example) can be carried out manually before the motor is moved towards the mixing tool, in particular is pivoted. This results in an automatic coupling of the motor shaft with the mixing tool shaft.

At the upper end of the support frame 7, a holding device 8 is arranged. The mounting device 8 is removable, in particular to enable the container to be transported by truck, train or ship. The holding device 8 preferably comprises a frame comprising four uprights. The uprights of the holding device 8 are preferably guided in the uprights of the support frame 7. The uprights of the mounting device 8 are connected at the upper end by a horizontally lying frame arrangement. The uprights of the mounting device 8 can also be connected at the lower end area or in the middle area via a horizontally lying frame.

As illustrated in Fig. 2, 7 spring elements 9 can be arranged in the uprights of the support frame. Depending on the weight of the holding device 8 and a bulk goods container held by it, it penetrates further (heavier) or less (lighter) into the support frame 7.

Preferably, flexible bulk goods containers, in particular big bags, are attached to the holding device 8. For this purpose, the holding device 8 can have eyelets or hooks at the upper end, on which the flexible bulk goods container is suspended.

Due to the weight of the filled flexible bulk goods container, the holding device 8 is lowered until the bulk goods container reaches the funnel 10.

If bulk material containers are used which are not equipped at the lower end with a constricted or otherwise closed and openable opening, a device for cutting open the bulk material container is preferably arranged in the funnel 10, in particular a knife pyramid, as can be seen in FIG. A grid can be arranged below the knife pyramid, which prevents large pieces or foreign bodies from reaching the conveyor device 3, in particular a conveyor screw. If the device is to be set up outdoors, an additional roof and / or a housing can be arranged above and / or around the mounting device 8.

At the upper end of the mounting device 8, rectangular hollow profiles can be arranged as shown in order to be able to lift the mounting device 8 onto the support frame 7 with the aid of a forklift truck. Alternatively, the holding device 8 can also be lifted off the support frame 7 with a crane. A big bag is preferably placed in that the holding device 8 is lifted off the support frame 7 and placed over a big bag placed on the floor or a platform. After the big bag has been attached to the holding device 8, it is lifted back onto the support frame 7. In another embodiment variant, the holding device 8 consists of two parts, only the upper part, comprising the hollow profiles and the fastening means for the flexible bulk goods container, being lifted off. The hollow profiles and the fastening means are preferably present on a common frame element. The upper part or the lower part preferably has four centering cones, the respective other element having four corresponding openings. This facilitates the exact placement of the upper part on the lower part.

In a further development of the mixing tool of the foam mixer 2, it is proposed according to the invention to provide the spring steel plates with a plastic coating.

In one embodiment, the mixing tool of the foam mixer 2 can have several mixing elements, in particular in the form of spring steel plates, which are present according to at least one of the following variants:

- Elements with an alignment parallel to the conveying direction, which strip the inner wall of the foam mixer 2.

- Elements with an orientation inclined to the conveying direction, the inclination being in the direction of rotation of the mixing tool,

- Elements with an orientation inclined to the conveying direction, the inclination being opposite to the direction of rotation of the mixing tool.

It is assumed that the elements with an inclination in the direction of rotation of the mixing tool cause an accelerated transport of the foam, while the elements with an inclination against the direction of rotation of the mixing tool cause a slowed transport of the foam.

Preferably, the foam mixer 2 comprises elements with an orientation parallel to the conveying direction, which strip off the inner wall of the foam mixer 2 and inclined elements of at least one of the aforementioned designs. Preferably, the foam mixer 2 comprises both types of inclined elements. The foam mixer 2 preferably comprises all three types of elements.

In a further development according to the invention of the system of EP3145687B1, a scraper tube 11 is preferably arranged at the outlet of the foam mixer 2.

Via the scraper tube 11, the mineral foam coming from the foam mixer 2 reaches a container 12, which can be the pump funnel of a pump 13.

In the container 12 or pump funnel, a stirring element is preferably arranged, which continuously strips material from the container or funnel wall. The pump 13 is preferably a hose pump. The hose pump is preferably a rotary hose pump. The hose pump is preferably arranged with a horizontal hose guide.

The pump 13 sucks mineral foam from the container 12 and pumps it to a switching element 14, which is preferably designed as a 2-way valve. A line to the filling location can be connected to the first output 15 of the switching element 14. A line to a waste container or a foam destruction device can be connected to the second output 16 of the switching element 14.

The system according to the invention preferably comprises an operating element 17 which is accessible from the outside of the transport container 5. The operating element 17 is preferably pivotable about at least one vertical axis. The operating element 17 can be attached to a swivel arm and swiveled out of this through an opening in the container wall. The opening can be closed for transport with the back of the operating element 17, or by an additional door or flap, or another closure element. The operating element 17 preferably has a contactor or a sensor which detects the position in which the operating element 17 is located.

In Fig. 5 and 6, a preferred embodiment of the stripping tube 11 is shown. This comprises a tube 18 which can be rotated about its longitudinal axis. The tube 18 is preferably made of plastic. In the pipe 18 there is a stripping arm 19, which is preferably located in the upper region of the pipe 18. This is particularly preferably laterally offset to the upper apex of the tube 18. The direction of rotation of the tube 18 is preferably opposite to the direction in which the scraper arm is arranged offset from the apex. The stripping arm 19 comprises a stripping element, which preferably rests against the inside of the pipe 18. The tube 18 is rotated around its own axis by a drive so that the stationary stripping element strips material from the inner wall of the tube. As can be seen in FIG. 6, the output-side end of the foam mixer 2 preferably protrudes into the interior of the tube 18. A bearing 21 for the mixing tool of the foam mixer 2 is preferably provided in the interior of the tube 18, which bearing is fastened to the housing of the foam mixer 2 or to another non-movable part of the system. The bearing can be in the form of a bearing plate. As shown, between the housing of the foam mixer 2 and the upper apex of the

Tube 18 there is a free space. In this free space there is preferably a spray device 22 which is aligned with the bearing of the mixing tool of the foam mixer 2. The scraper element preferably runs in the longitudinal direction of the scraper tube 11 as far as behind the bearing 21.

The foam mixer 2 preferably has an inner tube (not shown in FIG. 6) which protrudes into the housing part 20 of the foam mixer 2, which is at least partially present in the scraper tube 11. The inner tube is preferably made of plastic. The inner tube can protrude up to the bearing plate or the bearing 21, or preferably end before it. At least in the lower area there is a sealing element, for example in the form of a lip, between the tube 18 and the housing part 20. The sealing element preferably runs around the entire tube 18, it being possible for the latter to have an opening for the spray device 22 to pass through.

7 and 8, a preferred switching element 14 is shown. This has an inlet-side connection 23 to which the pump 13 is connected, preferably with a hose line. The pump 13 is preferably a hose pump, since this has proven to be gentle on the foam structure of the mineral foam and the squeezing of the flexible hose prevents or reduces the mineral foam from grabbing.

The input-side connection 23 is preferably fastened to a pivotable element in order to be able to be optionally connected to one of the two outputs 15 and 16 of the switching element 14. The pivoting of the input-side connection 23 is preferably carried out with a drive, for example by means of a toothed ring, which is rotated by means of a motor. Less preferably, the two outlets 15 and 16 could also be attached to a pivotable or displaceable element in order to be able to be alternately connected to the input-side connection 23. Less preferably, the input-side connection 23 can also be attached to a displaceable element.

At one of the two outputs 15 and 16, a line is connected to the filling point of the mineral foam. A line to a waste container is connected to the other output 15 or 16. At the filling location, for example on a manually operated filling lance, there is preferably a switch or a button or another suitable operating element, such as a lever, via which filling can be stopped or started. The control element for filling can be on a portable device. The operating element 17 can have an operating element or an operating function for starting and stopping the foam conveyance at the filling location.

Preferably, the switching element 14 is automatically actuated at each stop of the filling, so that the input 23 is connected to the output 15, 16, which leads to the waste container.

Preferably, there is a foam destruction device between the switching element 14 and the waste container, which destroys the air bubbles in the foam transported to the waste container in order to reduce the volume of waste.

An impeller pump has proven to be suitable as a foam destruction device.

Preferably, the switching element 14 can have a water connection in order to flush the line to the waste container after it has been in use. In one embodiment, the water connection can also be used to flush the production line, in particular if the filling of the mineral foam is interrupted for a longer period of time.

Fig. 9 schematically illustrates a preferred embodiment of the system for water treatment, the skilled person in principle many ways are open to the mixing water for the slurry mixer and the water for producing the foam in separately adjustable amount and temperature as provided according to the invention

place. The system comprises a water source 24, which can be present as a tank or as a connection to a water supply network. Optionally, the system includes a booster pump 25. The system includes at least one device for generating hot water, for example an instantaneous water heater 26. In addition, the system includes at least two devices for setting, controlling or regulating the water temperature and quantity, for example in the form of at least two mixer taps 27, 28 , in particular in the form of thermostatic mixer taps. Each mixer tap 27, 28 has a connection for hot water of the device for hot water generation and a connection for cold water from the water source 24 or the pressure increasing pump 25. The water of a first mixer tap 27, which has been set in terms of quantity and temperature, is fed into the slurry mixer 1 as mixing water. Additives can be added to the mixing water, which are introduced into the line between mixer tap 27 and slurry mixer 1, for example by a suitable device (e.g. suction line, pump). The water can also be provided with additives in an intermediate container and then introduced into the slurry mixer 1.

The water set in terms of quantity and temperature of a second mixer tap 28 is fed to at least one device for generating foam, for example a foam cannon 29. For example, a surfactant or protein foam is produced. As shown, there are preferably at least two devices for generating foam, for example two foam cannons 29. As shown, these can be fed by a common mixer tap 28. In another embodiment variant, a mixer tap 28 can be provided for each foam cannon 29, so that the amount and temperature of the water in the foam cannons 29 can also be set, controlled or regulated independently of one another. As shown, the foam lines of the foam cannons 29 each open into the foam mixer 2 at independent positions at the front end thereof. The first foam inlet is preferably located on the side of the mixer housing in that longitudinal area in which the eccentric pump 4 is present at the upper end. The second foam inlet is preferably located at the top of the mixer housing, viewed in the longitudinal direction of the mixer housing, after the longitudinal area where the eccentric pump 4 is present. Compared to the introduction with only one foam gun at only one point, this variant has proven to be advantageous, among other things, due to the improved mixing and the higher throughput.

In another embodiment variant, there is at least one foam inlet, seen in the transport direction of the foam mixer, in front of the inlet for the slurry. The foam mixer is advantageously first filled with foam and the slurry is mixed with the foam in a section located behind it. This prevents or reduces slurry, and thus hardening material, from reaching the end of the mixer housing on the motor side.

In one embodiment, the switching element 14 is not present and the production line is placed in a waste container or a foam destruction device at the filling location if the filling into the components to be filled is briefly interrupted.

In that embodiment variant with switching element 14 it is preferably provided that this automatically switches from the destruction line back to the production line after a predefinable period of time (depending on the curing time), since otherwise the material in the production line would harden. The switchover is preferably announced by means of an alarm. Foam is transported through the destruction line - preferably only during breaks, for example when changing from one element to be filled to the next. In one variant, the transport through the destruction line can only take place until the operator has placed the production line in a waste container or a foam destruction device.

In an alternative embodiment variant, the production line can be flushed after a predeterminable period of time. In an alternative embodiment variant, the entire system can be stopped and flushed after a predefinable period of time.

Preferably, the operator can switch between the pause mode with foam destruction and a system stop with stopping the material supply and rinsing the system with cleaning liquid.

ability, especially water.

In Fig. 10, a preferred filling station 30 is shown, which is suitable for use with the mineral foam system according to the invention. Of course, the present invention can be used on or with any filling station. The filling station 30 described is advantageous for large components to be filled, such as parts of prefabricated houses. The filling station 30 comprises a filling element 31, for example in the form of a filling lance, which is connected to one of the outlets 16, 15 of the switching element 14 with a hose line. The filling station 30 comprises a peeling bridge, comprising a receiving element 32, to which a peeling element (not shown) is attached. The receiving element 32 preferably has a vertical axis 37 about which the pulling element can be rotated or pivoted. The rotary or pivoting movement is preferably carried out driven by a motor. The rotary or swivel movement can be carried out by programming via a control system, or by remote control by a user.

The receiving element 32 is attached to a traverse 33 by means of a trolley, the trolley being movable along the traverse 33. The traverse 33 is located on at least two supports 34, 35, which can be moved transversely to the direction of travel of the trolley. Both supports 34, 35 preferably have rollers. At least one of the supports 35 is guided on a rail, so that a fixed alignment of the extraction bridge is maintained. The second support 34 can be guided freely on the hall floor 36.

The distance between the supports 34, 35 is preferably adjustable. This is preferably done by lifting the freely guided support 34 and moving it along the traverse 33.

When filling, the filling element 31 is guided over a component shown in dashed lines in order to fill it with the mineral foam. The height of the peel bar relative to the floor or the cross member 33 is adjustable in order to be able to be adapted to the required filling height of the component. The filling of the component with mineral foam and the spreading and smoothing of the mineral foam with the peel bar are preferably carried out at the same time, in that the filling element 31 is guided along a manually selected or programmed path over the area or opening of the component to be filled and the peel bar along the path of the filling element 31 is tracked.

Claims (17)

Claims 1. Plant for generating a mineral foam, comprising a metering device (3) for solids, a slurry mixer (1) for mixing the solids and a mixing liquid to form a slurry, at least one foam generating device for providing a foam, a foam mixer (2) for mixing the slurry and the foam to form a mineral foam, the slurry mixer (1) and the foam mixer (2) being designed as continuous mixers and the system comprising a system for water treatment, characterized in that the system for water treatment is for the slurry mixer (1) and the at least a foam generation device provides the water required separately, the temperature of the water for the slurry mixer (1) and the at least one foam generation device being adjustable, controllable or regulatable independently of one another. 2. System according to claim 1, characterized in that it also comprises a pump (13) for pumping the mineral foam, wherein the system is arranged in a transport container (5) and is operated in this. 3. System according to claim 2, characterized in that a switching element (14) is also arranged in the container, which is located after the pump (13) and which connects the output of the pump (13) via a first output (15) of the switching element (14 ) connects to a line to a filling station and connects via a second output (16) of the switching element (14) to a line to a waste container. 4. Plant according to one of claims 1 to 3, characterized in that the foam mixer (2) is connected to a scraper tube (11), this comprising a tube (18) which rotates about its own axis and has a stationary scraper element which is present in the interior of the tube (18) and strips mineral foam from its inner jacket surface. 5. Plant according to one of claims 2 or 3 in combination with claim 4, characterized in that a container for the mineral foam is arranged after the scraper tube (11), from which container the pump (13) sucks in the mineral foam. 6. System according to one of claims 1 to 5, characterized in that an operating element (17) for controlling the system is arranged on the outside of the transport container (5). 7. Installation according to claim 6, characterized in that the operating element (17) can be pivoted into the transport container (5). 8. Installation according to one of claims 1 to 7, characterized in that the transport container (5) has a support frame (7) which extends at least from the container floor to the container ceiling. 9. Plant according to one of claims 1 to 8, characterized in that the transport container (5) has a support frame (7) to which at least the slurry mixer (1), the foam mixer (2) and the metering device (3) are attached. 10. Plant according to one of claims 8 to 9, characterized in that the transport container (5) above the support frame (7) has at least one opening and a mounting device (8) is removably attached to the support frame (7), the mounting device ( 8) carries a bulk container for the solids. 11. Plant according to claim 10, characterized in that a funnel (10) is present below the holding device (8), via which funnel (10) the solids get from the bulk material container to the metering device (3). 12. System according to one of claims 10 to 11, characterized in that the mounting device (8) is supported in the support frame (7) in a height-adjustable manner, the mounting device (8) being moved further out of the support frame (7) the lighter the bulk goods container is . 13. Installation according to claim 8, characterized in that the support frame (7) comprises four posts, the posts being attached to the container floor and the container floor being reinforced in the area of the posts. 14. Plant according to claim 10, characterized in that the support frame (7) comprises four uprights, the mounting device (8) also comprising four uprights, the uprights of the mounting device (8) being guided in the uprights of the support frame (7). 15. Plant according to one of claims 1 to 14, characterized in that two foam generating devices are mounted in the transport container (5) which feed foam at different points in the foam mixer (2). 16. System according to claim 2, characterized in that the pump (13) is a hose pump. 17. A method for operating a plant for producing a mineral foam, comprising a metering device (3) for solids, a slurry mixer (1) for mixing the solids and a mixing liquid to form a slurry, at least one foam producing device for providing a foam, a foam mixer (2) for mixing the slurry and the foam to form a mineral foam, the slurry mixer (1) and the foam mixer (2) being designed as continuous mixers and the system comprising a water treatment system, characterized in that the water for the slurry mixer (1) and the water for the foam generation device is provided, the temperature of the water for the slurry mixer (1) and of the water for the foam generation device being set, controlled or regulated independently of one another. In addition 7 sheets of drawings