DE19911119A1 - Dust-releasing material dosing process, e.g. for dosing aluminum powder used as pore-former in porous concrete production, comprises dust extraction and collection in the operating water of a water jet pump - Google Patents

Abstract

A dust-releasing material dosing process comprising dust extraction and collection in the operating water of a water jet pump (70) is new. A dust-releasing material dosing process comprises withdrawing the material from a supply container (2) by means of a dosing device (2a) for supply to a weighing device (42) and then to a delivery device (50), dust arising in the weighing device (42) and delivery device (50) being extracted by a water jet pump (70) for collection in the pump operating water. An Independent claim is also included for equipment for carrying out the above process.

Description

The invention relates to a method for dosing dusts releasing material according to the preamble of claim 1 and a device for performing the method according to the Oberbe handle of claim 10.

It is known to be used in the manufacture of aerated concrete components Generation of the pores in the aerated concrete moldings aluminum powder an aqueous suspension of mineral binder components to add. This aluminum powder forms together with existing NEN hydroxyl ion hydrogen gas, which is in the suspension Bubbles results, which in the finished aerated concrete component the ge desired pores. To the aluminum powder of the aqueous To add suspension, aluminum powder metering systems are used turns. It is known that in the aluminum powder metering systems Extract aluminum dust and remove it in dry filters divorce. However, this procedure was approved by the supervisory board forbidden because static in the dry separator Charging Set ignition sources with the consequences of dust explosions can.

As a result, the transition points between the Do equipment, the scales and the discharge containers dustproof cuffs equipped. These are cuffs air permeable, but can not prevent that pressure between weighing vessel and upstream and downstream systems build up differences. These pressure differences are one cause of dosing errors. With effective diameters of approx. 200 mm at the  Transitions between the weighing container and the upstream and downstream switched system parts causes pressure, for example difference of just 1 mm water column already 35 g dosing error, which can be described as significant. Also occurs in the air permeable cuffs made from the finest aluminum dust.

EP 0 810 022 A1 describes a device for cleaning Exhaust air containing aluminum dust from the metal-processing ind known. The device consists of a dust washer with one or more exhaust air inlets and one or more exhaust air outlets and a catch basin for the washing solution, wherein in the exhaust air inlet or sprays for Na Tronlauge are arranged and a multi-chamber reaction vessel ter is provided in the lower section of the reaction product is accumulated as an aluminate solution. In the upper section of the reaction vessel, a fan is arranged, which Sucks reaction gases.

The object of the invention is a method and an apparatus for dosing and weighing with a dust collector create, the method and the device a larger, improved dosing accuracy, high operational reliability low operating costs and a resource-friendly operating mode ensure.

The task is accomplished with a procedure with the characteristics of the To claim 1 and a device with the features of the claim 10 solved. Advantageous further developments are in the of these dependent subclaims.

According to the invention, the containers, in particular the Wiegbe container and the downstream system parts of the dust sucks, using a water jet pump. As Driving water for the water jet pump becomes the mixing water for the aluminum dispersion used, the jet pump from egg water is applied to the reservoir. In the what  jet pump, the extracted dust from the air is immediately in Depressed water and fed to the reservoir, where the mixing water for the next batch of this storage container removed and the dust is immediately fed into the process. Fresh water runs on through a level control.

It has surprisingly been found that the suction according to the invention also a much more exact dose material is weighed and weighed. This is going on attributed that defi by the suction according to the invention niert, in particular the same pressure ratios above and un prevail below the weighing vessel so that the weighing does not by pressures acting on the vessel, for example in the out support device is falsified. It is also advantageous that the aluminum powder is separated in the water and passivated, the separated aluminum dust along with the water is used further, so that further cleaning and disposal steps can be omitted and raw materials can also be saved the. It is also advantageous that the aluminum dosing system is dust-free, so there is no danger of aluminum dust there are explosions and the system is not expensive must be inclined.

In the following, the invention will be illustrated using a drawing arrested, whose only figure is a sketch of the principle he shows device according to the invention.

The inventive device for weighing and dosing 1 has a dosing device 2 a, which in a known manner at the outlet of a storage or weighing container 2 below is arranged, for example flanged.

The metering device 2 a has, for example, a screw conveyor 3 . The screw conveyor 3 comprises an elongated hollow cylindrical conveyor tube 4 . At the ends of the conveyor tube 4 , bearing bushes are arranged, which close the tube 4 at the end, except for bearing bores. A screw 12 is arranged in the tube 4 . The worm 12 comprises an elongated worm shaft and a worm gear arranged around the worm shaft. The worm gear extends from one bearing bush or one conveyor tube end to the other bearing bush or the opposite conveyor tube end. The worm shaft reaches through the bearing bushes and is rotatably supported in the bearing bores. In the area of a conveyor tube end, a drive 14 , in particular an electric drive 14, is arranged outside the conveyor tube and acts on the worm shaft.

In the area of a conveyor tube end, an upper-side opening 16 is arranged in the conveyor tube 4 , through which material from egg nem silo 2 can reach the area of the screw 12 .

In the area of the opposite end of the conveyor tube, a discharge opening 17 is arranged underneath on the conveyor tube 4 , which is followed by a downward-pointing discharge shaft 18 . A distance from the discharge opening 17, a shut-off valve 19 is disposed in the discharge chute 18, which is pivotally ge in the shaft 18 supports. The butterfly valve 19 has an outer contour which corresponds essentially to the inner contour of the shaft and can be pivoted from an opening closing the shaft into an open position.

As an alternative to the screw conveyor 3 , however, any other metering conveyor, e.g. B. a rotary valve 20 or dosing plate can be used.

Below the flap 19 , the discharge chute 18 opens into a weighing container 42 with a discharge opening 40 . The weighing container 42 is approximately funnel-shaped with downwardly tapering walls 43 , a tubular spout 44 and an egg ne upward opening of the funnel 42 closing the top wall 45 . The top wall 45 is firmly connected to the shaft 18 of the metering conveyor 2 a and has a funnel-side circumferential annular gap 45 a. In the ring gap 45 a, the upper end edge areas of the side walls 53 of the weighing container 42 are axially displaceably mounted, so that the weighing container 42 is vertically displaceable relative to the top wall 45 in the area of the annular gaps 45 a. In the funnel outlet 44 , a flap 46 is arranged, which has an outer contour that corresponds to the inner contour of the funnel outlet 44 . The closure flap 46 is designed to be pivotable in such a way that it can seal off the funnel outlet 44 . The weighing container 42 is mounted with a carrying device 47 on pressure measuring devices 48 , such as, for example, pressure cells or measuring beams of a balance, a vertical movement of the weighing container 42 on the pressure cells 48 being possible. The discharge shaft 18 is fixed and dust-tight with the ceiling wall 45 of the weighing container 42 connected.

The weighing container 42 opens with its outlet 44 into a loading container 50 , which serves as a lock 50 . The container 50 is funnel-shaped with walls 51 tapering towards one another and a tubular outlet 52 which adjoins the walls and points downwards. In the outlet 52 , a pivotable closure flap 53 is arranged, which is pivotable in such a way that it can close the outlet 52 and release it. In the container 50 , a partition plate 55 is arranged, which ends at the top a piece under a ceiling wall 54 and ends at the bottom a piece above the axis of rotation of the flap 53 . The partition plate 55 divides the interior of the container 50 into two areas 55 a, 55 b, the partition plate 55 being arranged in such a way that the entire material coming through the outlet 44 into the container 50 into the area 55 a and thus only on that flap half of the flap 53 arrives which, when opened, moves downward in the direction of the fall of the goods. The separating plate 55 prevents the opening of the flap 53 from a subsequent vessel vapor 56 ascending water or rising damp with the walls 51 of the bulk portion 55 a comes into contact, whereby the formation of lumps in the powdered well prevented. An upper opening of Be hälters 50 is covered with the lid-like, mounted top wall 54, the container 50 sealingly, wherein the ceiling wall 54 of the weighing container 42 is penetrated by the outlet 44th The top wall 54 and the outlet 44 of the weighing container 42 are firmly connected to one another in a pressure-tight manner. The ceiling wall 54 has, analogously to the ceiling wall 45 on the container side, a peripheral annular gap 54 a. In this ring gap 54 a, the upper end edge regions of the walls 51 of the container 50 are axially displaceably received, so that the cradle container 42 with the fixed at its outlet 44 arranged Dek kenwandung 54 relative to the container 50 is vertically displaceable. It is essential that the effective surfaces of the ceiling walls 45 and 54 , which face the respective container interiors of the containers 42 and 50 and cover them, are of the same size. The container 50 and the lock 50 opens with its outlet 52 into a dispersing or transmit vessel 56th The dispersing or transmitting vessel 56 is cylindrical or funnel-shaped with a Dec kenwandung 57 , extending from the top wall 57 down he extending side walls 58 and a curved bottom wall 59 . The top wall 47 is penetrated by the outlet 52 of the lock container 50 . A mixing device 60 is arranged in the dispersing or transmitting vessel 56 . The Mischein device 60 comprises a mixer shaft 61 extending from the area of the ceiling wall 57 to the bottom wall 59 , with neighbors to the bottom wall 59 mixing blades 62 being arranged on the mixer shaft 61 . A drive, in particular an electric drive 63 for the mixer shaft 63, is arranged above the ceiling wall 57 . In the region of the lowest point of the bottom wall 59 there is a closable outlet 64 which leads to a mixer (not shown). Alternatively, the Mischeinrich device 60 is designed as a mixing pump, which via a drain pipe, the z. B. is attached to the outlet 64 , sucks the mass located in the dispersion vessel 56 and feeds it again via an inlet pipe (not shown) to the dispersion vessel 56 . The required mixing is achieved by such a pumping.

In the area of the top wall 45 of the weighing vessel 42 , a suction pipeline 66 is arranged. A further suction pipeline 67 is arranged in the region of a side wall 51 of the vessel 50 , the suction pipelines 66 , 67 meeting in a T-branch 68 and opening into an intake pipeline 69 . The intake pipe 69 leads to a water jet pump 70 . The constant negative pressure generated by the water jet pump 70 thus also prevails in the interior of the containers 42 and 50 , so that there is a defined, equally large pressure, preferably a negative pressure, in each case there. This defined negative pressure acts there on the exactly the same effective areas of the deck wall 45 and 54 , so that the weighing container 42 is in a vertical equilibrium position. Pressure differences that occur due to the filling and / or draining of goods into and / or from the containers 42 or 50 are immediately eliminated, so that weighing errors due to these pressure differences are excluded. The water jet pump 70 has an inlet 71 , an outlet 72 and a suction chamber 73 . With the outlet 72 , the water jet pump 70 opens into a reservoir 73 . The Wasservor storage vessel 73 has a top wall 74 , which is penetrated by the outlet 72 , and from the top wall 74 to un th extending side walls 75 . From the lower edges of the side walls 75 a conical or funnel-shaped area 76 extends with side walls 77 tapering downward. In the lowest area of the funnel-shaped area 76 , a pump 78 is arranged on the reservoir 73 . Below the pump 78 , a two-way valve 79 is connected, from which a pipe 80 leads to a sump 81 and a further pipe 82 leads to the dispersion or transmission vessel 56 . Furthermore, an outlet 83 is connected to the funnel-shaped region 76 of the storage vessel 73 , to which a pipe 84 connects, which leads to the inlet 71 or to the driving nozzle 71 of the water jet pump 70 , a pump device 85 being arranged in the pipe 84 , which the to drive the water jet pump 70 required driving pressure generated in the driving medium. At the Vorlagege vessel 73 , extending from the ceiling wall 74 upwards into the open, a ventilation pipe 86 or a ventilation shaft 86 is arranged, via which the extracted and washed air, which separates again from the system in the vessel 73 from the system or Plant escapes. In the area of the ceiling wall 74 of the receptacle 73 before a water supply line 90 is also net angeord. A controllable inlet valve 91 is present in the water supply line 90 , which, controlled by a floating ball or by level sensors, keeps the liquid level in the reservoir 73 approximately constant. The water storage vessel 73 has sensors that detect the liquid level in the vessel 73 and open the inlet valve 91 when the liquid level is undershot and close the inlet valve 91 when the level is exceeded.

The following is the operation of the invention direction explained.

With the metering device 2 a 2 dust-like material, in particular aluminum powder is conveyed from a storage silo. For this purpose the flap 19 is initially opened in the shaft 18 to have access to possibly lying on the flap 19, spillage of the flap 19 after the previous dosing of material in the hopper 18 located below the weigh bin 42nd Subsequently, the drive 14 , the screw conveyor 3 , is set in motion so that the screw 12 rotates in such a way that material in the screw flights is conveyed into the region of the opening 17 in order to fall into the shaft 18 . The movement of the screw 12 conveys material from the container 2 into the conveyor 3 . If the target quantity to be metered has been conveyed and the target quantity in the weighing container 42 has been reached, the flap 19 is closed and at the same time the drive 14 of the screw conveyor 3 or the metering device 2 a is switched off.

Before the operation of the metering conveyor 3 and the metering device 2 a is preferably in continuous operation continuously from the water storage tank 73 through the outlet 83 and the pump 85 and the pipe pumped through the water jet pump 70 84th This will in the containers 42, 50 a flow of air to the water jet pump 70 through the pipes 66, 67, 69 he witnesses and thus in the reservoirs 42, 50 defined under built up a pressure, which is preferably monitored. The aluminum powder conveyed and metered with the device falls into the container 42, the flap 46 of which is initially closed and collects above the flap 46 in the container 42 . The weight of the metered material or aluminum powder exerts a pressure on the pressure load cells 48 which corresponds to the weight. The duration and speed of the conveying of the metering device 2 a is regulated via the pressure load cells and suitable corresponding measuring transducers. When the target quantity has been reached, the drive 14 of the metering device 2 a is stopped and the flap 19 is closed. The dusty material located above the material to be weighed is sucked through the pipeline 66 and 69 into the water jet pump 70 , where it is taken up by the circulating water and flushed through the outlet 72 into the container 73 .

After all of the dosed and balanced material has accumulated in the container 42 , the flap 46 is opened so that the material falls into the lock or the lock container 50 . After all of the material in the container 42 has fallen into the container 50 , the flap 46 is closed again and a new dosing process can be started. The material remains in the container 50 until it is required in the dispersing or transmitting vessel 56 . During this time, material lying in the air on the flap 53 of the vessel 50 is fed via line 67 and 69 to the water jet pump 70 and is deposited there in the water. If aluminum powder is requested for a porous concrete suspension to be produced, the pump 78 switched on and the valve 79 set such that water contained in the container 73 and enriched with aluminum powder passes through the pipeline 82 into the dispersion or transmission vessel 56 . The drive 63 is turned on so that the liquid in the container 56 is moved with the agitator blades 62 . Subsequently, the flap 53 is opened so that material located in the container 50 falls through the outlet 52 into the water and is mixed there with the impellers 62 . Before opening the flap 53 , it may be expedient, particularly when using the vessel 56 as a transmission vessel, to bring about a pressure equalization between the vessel 56 and the vessel 50 . If the aluminum-water dispersion is requested for further processing, the bottom closure of the vessel 56 is opened and the aluminum / dust-water dispersion leads to an aerated concrete mixer through the pipeline 64 .

The water in the reservoir 73 , in which the aluminum dust is deposited, can, as explained, be added to the preparation of the aluminum-water dispersion of the same aluminum batch from which the dust was extracted, but it can also be the next Batch can be added.

Preferably, the control of the pump 78 and the inlet 91 is provided such that new water is only supplied to the vessel 73 after the amount of water expired that is necessary for a batch, in order to discharge the entire amount of aluminum powder and to avoid turbulence. Here, however, a residual amount remains such that the pump 85 does not run empty if possible.

In the device according to the invention it is advantageous that as Driving water for the water jet pump the mixing water for the Aluminum dispersion is used, so that the invention Device works particularly resource-saving. Furthermore, the accumulating dust with the device according to the invention vacuumed casually and safely, so that there is no risk of dust explosion sions exists. Furthermore, with the device according to the invention device defined pressure ratios is achieved, in particular by suction with the same effective diameters of the annular gaps  over and under the weighing container any over or under pressure in Weighing system automatically compensated, which makes a particularly ge accurate dosage and weighing is achieved.

Claims (31)

1. A method releasing for metering dust Materia lien, wherein the material drawn off with a metering device (2 a) of a reservoir (2) and a Wiegeein device (42) is metered into the weigh the material and, after weighing a discharge ( fed 50) performs will be, at least sucked into the weighing device (42) and the discharge device (50) dust created by means of a water jet pump (70), the water jet pump (70) fed and pump in the propellant water, the water jet (70) is deposited. 2. The method according to claim 1, characterized in that with the suction in the system, in particular in the ge device ( 42 ) and the discharge device ( 50 ), defined pressure ratios, in particular vacuum ratios, are set. 3. The method according to claim 1 and / or 2, characterized in that in the system, in particular between the metering device ( 2 a), the weighing device ( 42 ) and the discharge device ( 50 ), a pressure equalization is brought about. 4. The method according to one or more of the preceding claims, characterized in that the motive water for the water jet pump ( 70 ) is used as mach water for a dispersion of the weighed and exhausted material. 5. The method according to one or more of the preceding claims, characterized in that the water jet pump ( 70 ) generates an air flow of the weighing device ( 42 ) and the discharge device ( 50 ), with pipelines ( 66 , 67 , 69 ) being present via wel che the water jet pump ( 70 ) on the suction side to the weighing device ( 42 ) and to the discharge device ( 50 ) is connected and the dust is sucked through the pipes ( 66 , 67 , 69 ) to the water jet pump ( 70 ). 6. The method according to one or more of the preceding claims, characterized in that with the metering device ( 2 a) from a storage container ter ( 2 ) the material via a shaft ( 18 ) in the weighing container located under the shaft ( 18 ) ( 42 ) is conveyed until a predetermined amount of material is present in the container ( 42 ) and then the material is passed on to the discharge container ( 50 ). 7. The method according to one or more of the preceding claims, characterized in that water from a reservoir ( 73 ) through an outlet ( 83 ) on the reservoir by means of a pump ( 85 ) is pumped through a pipe ( 84 ), the pipe ( 84 ) is arranged on the inlet side of the water jet pump ( 70 ) and the reservoir ( 73 ) on the outlet side of the water jet pump ( 70 ) is arranged so that the water can be pumped in the circuit by the water jet pump ( 70 ). 8. The method according to one or more of the preceding claims, characterized in that the water jet pump ( 70 ) is operated during the metering, how gene and discharge in a circuit so that the entire dust accumulating during a metering, weighing and discharge process is put down in a batch of water. 9. The method according to one or more of the preceding claims, characterized in that the water in the container ( 73 ), in which the dust is deposited, leads to the dispersion vessel ( 56 ) and then the metered, weighed and carried out material the dispersion vessel ( 56 ) is supplied and a dispersion is prepared in the dispersion vessel ( 56 ) from the water with dust and the weighed material. 10.Device for dosing dust-releasing material, in particular aluminum powder, with a Dosiereinrich device ( 2 a) is present, with the material from a storage container ( 2 ) is metered and if necessary an intermediate storage container is added, and a weighing container ( 42 ) is present in which the material from the dosing device ( 2 a) is brought and weighed and a discharge device ( 50 ) or lock ( 50 ) is available, into which the material is placed after weighing, at least on the weighing container ( 42 ) and to the discharge device ( 50 ) means for extracting dust, in particular pipes ( 66 , 67 ) are connected, through which the dust can be extracted in these areas, a dust extractor being connected to the means for dust extraction, and the dust extraction device comprises a water jet pump ( 70 ) which sucks in the dust and precipitates it in the driving water. 11. The device according to claim 10, characterized in that the water jet pump ( 70 ) has a motive water inlet ( 71 ), a motive water outlet ( 72 ) and a Ansaugrohrlei device ( 69 ), wherein the suction pipe ( 69 ) opens into egg ne suction chamber ( 73 ) . 12. The apparatus according to claim 10 and / or 11, characterized in that the water jet pump ( 70 ) with the outlet ( 72 ) is connected to a storage vessel ( 75 ), an outlet ( 83 ) being connected to the water storage vessel ( 73 ) , wherein the outlet ( 83 ) via a pipe ( 84 ) and a pump device ( 85 ) to the motive water inlet ( 71 ) of the water jet pump ( 70 ) is connected so that liquid from the reservoir ( 73 ) in circulation through the water jet pump ( 70 ) is pumpable. 13. The device according to one or more of claims 10 to 12, characterized in that the means for dust extraction are suction pipes ( 66 , 67 ) which run from the weighing device ( 42 ) and from the carrying device to the suction pipe ( 69 ) and open to these . 14. The device according to one or more of claims 10 to 13, characterized in that on the reservoir ( 73 ) a pump device ( 78 ) is angeord net, a two-way valve ( 79 ) being connected below the pump device ( 78 ), of which a pipeline to a sump ( 81 ) and a further pipeline ( 82 ) leads to a dispersing or transmitting vessel ( 56 ) and a water supply line ( 90 ) to the storage vessel ( 73 ) is ruled out. 15. The device according to one or more of claims 10 to 14, characterized in that the water receiving vessel (73) to, at least one sensor which detects the liquid level in the vessel (73) and falls below the liquid level a Zulaufven (91) opens til and if the level is exceeded, the inlet valve ( 91 ) closes. 16. The device according to one or more of claims 10 to 15, characterized in that the discharge container ( 50 ), the dispersion vessel ( 56 ) is arranged connected downstream. 17. The device according to one or more of claims 10 to 16, characterized in that in the transition areas between metering device ( 2 a), weighing container ( 42 ), discharge container ( 50 ) and disper yaw vessel ( 56 ) each have a butterfly valve ( 19 , 46 , 53 ) is available with which the material path to the respective next plant part ( 52 , 50 , 50 , 56 ) can be closed. 18. The device according to one or more of claims 10 to 17, characterized in that in the transition region between the discharge container ( 50 ) and the dispersing vessel ( 56 ) means for suction of dust are connected by the resulting dust in this loading area and the water jet pump ( 70 ) can be supplied. 19. The device according to one or more of claims 10 to 18, characterized in that the metering device ( 2 a) with a discharge opening ( 40 ) of a discharge chute ( 18 ) opens into the weigh bar ( 42 ), the shut-off valve in the discharge chute ( 18 ) ( 19 ) is arranged. 20. The device according to one or more of claims 10 to 19, characterized in that the weighing container ( 42 ) is a container ( 42 ) with a tubular outlet ( 44 ), the container ( 42 ) forming walls ( 43 ) and one, one is the upper opening of the container ( 42 ) closing ceiling wall ( 45 ), in the outlet ( 44 ) a closure flap ( 46 ) is arranged. 21. The device according to one or more of claims 10 to 20, characterized in that the container ( 42 ) closing the top wall ( 45 ) is firmly and dust-tight with the discharge shaft ( 18 ) of the Do siereinrichtung ( 2 a) and one of the container ( 42 ) facing peripheral annular gap ( 45 a) has, in which the upper end edge regions of the walls ( 43 ) are axially displaceable, so that the weighing container ( 42 ) is vertically displaceable relative to the top wall ( 45 ). 22. The apparatus of claim 20 and / or 21, characterized in that the weighing container ( 42 ) with a carrying device ( 47 ) is mounted on pressure cells ( 48 ), wherein a vertical movement of the weighing container ( 42 ) on the pressure cells ( 48 ) and a relative mobility to the upstream and downstream system parts ( 2 a, 50 ) is possible. 23. The device according to one or more of claims 10 to 22, characterized in that the weighing container ( 42 ) with its outlet ( 44 ) opens into the discharge container ( 50 ) or the lock ( 50 ). 24. The device according to one or more of claims 10 to 23, characterized in that the container ( 50 ) has the container ( 50 ) forming walls ( 51 ) and a tubular outlet ( 52 ), the closure flap in the outlet ( 52 ) ( 53 ) is arranged and an upper opening of the container ( 50 ) is covered with a lid-like ceiling wall ( 54 ), the outlet ( 44 ) of the weighing container ( 42 ) reaching through the ceiling wall ( 54 ). 25. The device according to claim 24, characterized in that the ceiling wall ( 54 ) with the outlet ( 44 ) of the weighing container ( 42 ) is firmly and pressure-tightly connected and has a peripheral annular gap ( 54 a) facing the container ( 50 ), in the axially displaceably support the upper end edge regions of the walls ( 51 ), so that the container ( 42 ) with the top wall ( 54 ) arranged at its outlet ( 44 ) is vertically displaceable relative to the container ( 50 ). 26. The apparatus of claim 24 and / or 25, characterized in that the respective effective surfaces of the ceiling walls ( 45 ) or ( 54 ) facing the containers ( 42 ) or ( 50 ) are of equal area. 27. The device according to one or more of claims 10 to 26, characterized in that the container ( 50 ) or the lock ( 50 ) with its tubular outlet ( 52 ) opens into the dispersing or transmitting vessel ( 56 ), the outlet ( 52 ) passes through a top wall ( 57 ) of the dispersing or transmitting vessel ( 56 ). 28. The device according to one or more of claims 10 to 27, characterized in that the dispersing or transmitting vessel ( 56 ) has a Mischeinrich device ( 60 ), the mixing device ( 60 ) one from the area of the ceiling wall ( 57 ) to a bottom wall ( 59 ) of the vessel ( 56 ) extending mixer shaft ( 61 ) on which, adjacent to the bottom wall ( 59 ) mixing blades ( 62 ) are arranged and above the ceiling wall ( 57 ) a drive for the mixer shaft ( 63 ) acting on it is arranged. 29. The device according to claim 28, characterized in that the mixing device ( 60 ) has a suction pipe leading from the dispersion vessel ( 56 ) to the mixing pump and a feed pipe leading from the mixing pump to the dispersion vessel. 30. The device according to claim 29, characterized in that in the region of the lowest point of the bottom wall ( 59 ) of the vessel ( 56 ) a closable outlet ( 64 ) is net angeord, which leads to a mixer for mixing a pore concrete mass. 31. The device according to one or more of claims 10 to 30, characterized in that in the region of the top wall ( 45 ) of the weighing vessel ( 42 ) the suction pipe ( 66 ) is arranged and in the region of a side wall ( 51 ) of the vessel ( 50 ) From suction pipe ( 67 ) is arranged, wherein the suction pipes ( 66 , 67 ) meet in a branching area ( 68 ) and open into the suction pipe ( 69 ), which leads to the water jet pump ( 70 ).