DE7914349U1 - DEVICE FOR CONTINUOUSLY MIXING A DRIED MATERIAL WITH A LIQUID AND / OR A FOAM MATERIAL - Google Patents

Description

Device for the continuous mixing of a dry material with a liquid and / or a foam material

The innovation relates to a device for continuous Mixing a coarse-grained to powdery dry material, in particular a ready-to-use dry mortar, with a liquid and / or a foam product in a mixing chamber, which has a storage container for the dry product and a suction device downstream for the mix. Chemicals in powder form, for example, can also be used as dry goods which are then fed to further processing after they have been soaked through and the pore content has been increased. The device according to the invention can also be used to prepare a dough with a high porosity, e.g. for baking purposes will.

From DE-GM 7 046 623 a device of this type for mixing dry ready-mixed mortar with water is known. The end a storage container pre-printed by means of a screw conveyor

Dry material falls into a vertical mixing tube in which a dry material scraper circles and is followed by a feed pump is. Since the conveying device for the dry material and the mixing device are driven by two separate motors, the mixing device can be completely emptied independently of the dry material to be fed. That the mixing device The mixture that leaves the mixture contains only a relatively small proportion of air pores, which leads to the disadvantages listed below leads. Lime cement plasters and cement plasters tend to Application on the surface to be plastered to form drying cracks, which can occur after minutes or hours. In addition, after a long time there is also the risk of Formation of stress cracks. With conventional plasters you have these dangers due to the multi-layer application of the plaster mortar decreased. It has also been shown that coarser sands reduce the tendency to crack in the plaster. The conventional plastering process was however, very time-consuming and labor-intensive.

So-called single-layer plasters were therefore developed, which can also be processed with continuous mixing pumps. To a To ensure perfect machinability, however, the grain size had to be reduced to 1 - 1.5 for these materials,

So that a single-layer processing was possible with these plasters, chemicals had to be added for air entraining and water retention. In the case of batch mixers, also achieved good results, but with the continuous mixing pumps customary on the market (e.g. DE-GM 7 046 623) the material mixed too short. As a result, only a few air pores were introduced and the plaster's tendency to crack was considerably increased again.

The object of the innovation is to create a device with which it is possible to produce a particularly rich in air pores Produce mixed material or prepare it for further processing.

The task is with a device of the beginning

mentioned type solved in that according to the innovation between the Storage container and the mixing chamber at least one storage space filled with the dry material and air cushions is provided, which via calibrated slots, bores or the like on the one hand with the storage container and on the other hand with the Mixing chamber is connected.

While the use of screw conveyors or similar forced conveyors even reduces the air content in the plaster, the devices according to DE-OS 2 117 000 or 2 ^ 37 231 have not led to any tangible success, because on the one hand the supply of water in the area of the worm drive and, on the other hand, the stirring device downstream of the feed pump could not prevent the dry material from moving into less air-pore-free Form was fed to the mixer. This device is also an air-pore-enriched building material not to receive.

The use of the device according to the innovation reduces the increase in the air void content and the bulk density of the end product, e.g. the plaster; the thermal insulation is also improved; the ability to diffuse water vapor is greatly increased; drying out on the wall surface occurs faster; also can possibly any condensation water that has formed in the wall evaporates more easily. When the plastering mortar is wet, the water retention capacity improved, as the air pores interrupt the pore channels; therefore drying cracks and the binding agent do not occur so quickly have the water necessary for setting available longer. The processing of the plaster is easier because of the A "creamier" consistency is created in the air pores; the plaster is thus "smoother". The machinability, i.e. the pumpability the end material improves as the small pores like "ball bearings" on the wall reduce friction; so it becomes possible to either continue to convey the end product with a pump or to reduce the wear and tear of the pump by reducing the pressure to belittle. Improved by the introduced increased air porosity the yield per unit weight of the end product

ie you can clean more square meters with the same amount of material. In this connection it should be pointed out that ir. With the batchwise operating machines mentioned above, an air void content of 20-25? aimed at with the lime-cement plasters currently on the market, but this is rarely achieved exactly and evenly, since table times naturally fluctuate greatly on the construction site. With continuously operating plastering machines, which work using Moncschnecken, air entrainment, e.g. in the case of a lime-cement plaster, of only 7-10 % is achieved, while with the device according to the invention an air void content of approx. 25% and more can be achieved .

The slots, holes or the like provided according to the innovation can e-erade exceeding the coarse grain of the dry material Size.

If the device according to the innovation has the basic structure of a corresponding device according to DE-GM 7 0 ^ 6 623, i.e. the one with an approximately vertical drive shaft and one with a cylindrical feed space Mixing chamber is connected to one end of the substantially horizontal storage container, according to the innovation "Ischkanmer in the radial direction with respect to the cylindrical feed space expanded and essentially airtight. In this construction of the device according to the invention, a space-saving mixing chamber with an ass] impossibility of familiar "Similar mixing tubes are created, with which the air void content of the end product can be increased significantly.

Ir. Inside the mixing chamber there can be a supply line for the liquid and / or that? are distributed over the <~ ar.ze Miso'- ':.? Does the orv "hnt ^r r. Liquid l'ir.n, for example? ■; ch D. ^ mp ^ - as · - e: ir: n"isff'rniges medium - brought into the dry material.

a preferred embodiment of the innovation according to

Device, the supply line is annular and consists of one provided with bores, slots or the like Pipe. The intensive preparation of the material and the ring-shaped feed line also reduce wear and tear in the mixing chamber. This finely distributed sprinkling or spraying also leads to an increase in the air void content of the end product. The ring-shaped feed line for the liquid and / or the foam material in the mixing chamber can come from the dry material feed be separated by a stationary cylindrical baffle or the like.

It is also possible that the agitator of the mixing chamber is attached to a stub shaft which is detachably connected to the coaxial drive shaft, for example via a plug-in coupling. The provided above the storage compartment cylindrical feed chamber is advantageously at least mi at its side facing the storage space ^end:; provide blades and / or knives attached to the drive shaft; the blades and / or knives can be provided at least directly above d in calibrated slots, crevices, bores or the like that lead to the storage space.

For the passage of the dry material into the storage space is preferred an annular slot surrounding a jacket of the drive shaft is provided; for the passage of the dry goods from the storage space In the mixing chamber there is expediently an annular slot or the like between a stationary, the drive shaft at a distance surrounding housing wall and one possibly with blades provided turntable or the like.

The storage space just mentioned between the storage container and the mixing room is created by the fact that, for example, only your own Gravity through the small calibrated openings or slots falling dry goods above the slots through the material from the storage container conveyed dry material forms a barrier, so that the passing through in free fall, containing essentially air Dry material cannot vent. Air cushions or air pockets under low pressure are formed in the storage space.

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bubbles that cannot escape upwards and more from that further dry material falling on the edge of the turntable is carried along and fed to the mixing chamber.

The agitator provided in the mixing space can be blades or the like which are mounted on a turntable or the like extending transversely across the mixing chamber, which is separated from the wall of the mixing chamber parallel to the axis of rotation by an annular slot. At the edge of the turntable carrying the agitator or the like, pins, plates or the like are preferably attached running parallel to the wall of the mixing chamber. Through these pins, plates or the like, the already soaked pulpy mix becomes the aforementioned ring slot promoted and along the mixing chamber wall in the direction of the suction opening transported. Furthermore, it is possible that the turntable or the like carrying the agitator with small bores, Holes or the like for sucking air at a distance of about a third of the blade length from the wall of the Mixing chamber housing is provided.

On the lower side of the turntable carrying the agitator granulate plates, mandrels, knives or the like parallel to the axis of rotation be provided. The bottom wall adjoining the mixing chamber wall can also be designed in the shape of a truncated cone and the central section of the bottom wall perpendicular to the axis of rotation get lost; aer the cut running perpendicular to the axis of rotation the bottom wall can carry a ring or the like designed as a chicane for aas mixed material, the upper edge of which protrudes beyond the lower edge of the plates, mandrels, knives or the like. The one just mentioned. Chicane causes with the plates, Thorns, knives or the like together have a further mixing effect; due to the vortex or vortex effect achieved at the outlet due to the suction device, the Air sucked out through the small bores or holes is incorporated into the mix so that the air pore content is also maintained at this point is increased.

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The stub shaft carrying the agitator can at its lower end with an adapter for a coupling of the suction device be provided and between the coupling and the straight section of the bottom wall, an annular slot or the like be provided for sucking off the mix.

It is also possible that the upper wall of the mixing chamber is attached to the housing wall surrounding the cylindrical feed space and either a hinge or the like for capping off the mixing chamber or the mixing chamber on the upper wall is releasably attached.

Finally, they can be attached to the turntable or the like Blades be attached with their inner edges on a cylinder surrounding the stub shaft at a distance, which the turntable or the like that completes the storage space,

In the drawing is an example embodiment of the inventive device shown; it shows:

1 shows a longitudinal section through the embodiment, FIG. 2 shows a detail of this embodiment and FIG. 3 is a view along line 3-3 in FIG. 2.

A shaft 1 of an electric motor-driven agitator is provided with a jacket 2 and is centered in a cylindrical housing 3 housed. The cylindrical housing 3 extends to the electric motor, not shown, and has a lateral Breakthrough 4 on. The side opening U is with an in Direction of arrow 5 provided rotatable throttle valve 6 and leads to a storage container 7, the worm drive not closer is shown; the storage container 7 can be provided with a cover 8.

Dry material is conveyed into the housing 3 through the opening 4.

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On the jacket 2 of the shaft 1 knife-shaped wings 9 are attached, which "close" the space in the housing 3 at the upper edge 10 of the opening ^. The one with the dry goods essentially almost Completely filled space 11 is closed on its lower side by a wall 12, which can also be exchanged if necessary can be. The wings or blades 13 cause a "stowage" of the dry material in the direction of the lower end of the shaft 1. Around the jacket 2 is an annular gap or at the level of the wall 12 Annular slot 14 is provided through which the dosage of the dry material i the mixing device is made. Immediately above the annular gap 2 blades 15 are attached to the shell, the can also be restricted in such a way that they constantly bring about a supply of dry goods in the downward direction. Above the shovels 15 knife-like wings 16 can be provided, which may also be in an inclined position like the wings 13 on the jacket 2, can be attached and stow the dry goods in the direction of the mixing device. As can be seen from Fig. 2, it closes the jacket 2 at the level of the lower edge 17 of the wall 12 and is, for example, by means of a plug connection 19 with a stub shaft

20 rotatably connectable.

The cylindrical housing wall 3 points above its lower edge

21 has a radially extending upper wall 22, which is e.g. welded to the wall 3 or firmly connected in some other way.

Below the wall 12 a storage space 23 is provided, the lower end of which is formed by a disk or a plate 2k , on which wings 25 are attached, which can be set in such a way that they press the material to be dried in the direction of the wings 15. The disk 2k exposes an annular gap 26 which is provided between the housing wall 3 and the disk just mentioned.

Due to the fact that the dry material in the space 11 is deposited so far that the space above the wall 12 or above the blades 15 and the knife-like wings 16 is always completely filled with dry material, is through the annular slot

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14 conveyed only a desired dosed amount of dry material due to a rotation of the agitator shaft 1.

Since the ring slot 26 has a larger diameter than the ring slot 14, the dry material can fall through the ring slot 26 faster and better than through the ring slot 14. Since on the other hand, however, the blades 25 can also be set so that the dry material in the Storage space 23 is pressed, air cushions or air bubbles, which are under a slight overpressure, arise above the drying material lying in space 23; These air bubbles or air cushions ensure, due to the drainage of the material to be dried in the direction of the mixing space 30, that a particularly strong ventilation of the material to be dried in the mixing space can be carried out. The disk 24 is fastened to a cylindrical pipe section 31, on the lower edge 32 of which a further disk 33 is fastened. As can be seen from FIG. 5, five blades 34 are attached to the disk 33, with which the mixture of the dry material trickling down with a liquid, for example water 28, is carried out. The liquid is fed via a pipe ring 29 to which the liquid is fed under pressure via an inlet connection 30. In order to prevent the liquid from penetrating the dry material in the vicinity of the annular gap 26 ⁴ n , a shielding ring 35 is provided in the mixing space, which is welded to the pipe ring 29. In this way it is achieved that the dry material falls into the mixing space provided with blades 34 while still dry. The blades 34 can be set in order to effect a conveyance of the material in the radial direction outwards and at the same time upwards.

As can be seen from Fig. 3, 34 scrapers 36 are attached to the end of two blades, which the annular gap 37 to the cylindrical Release outer wall 38 of the mixing device. These scrapers can also have the shape shown in Fig. 3, i.e. bent so that it is the mix - in this case it is already completely soaked - press again in the direction of the stirring blades 34.

Ee: '. a Drehur.r der P'ihrwel Ie 1 and r-om.it Oes "" artel? 7 of the stub shaft 20 are the ^p hrschr> ufeln 3 '! ren "?> u 25 c in the wings rotation verrietst The tubularly örri.ce ^ PCHi 35 st-itionTr and prevents Up dr'-sugar nasty drenched mixed material The sides Ir Rinrschlitz 37 depressed.. '.'. '-' i rchgu ^! runs on a conical wall 4 ^ ir. ^ ichturif on the P '"hrv; elIe 1 hzv. the. V.'ellenstumpf 20. The right-wing 'real?' r to the ^ ". hrv: ellenachse running" hpchnitt 'U der' /! and '· "int with a," inpschlitz 42 ve ^ see, by v.'eIcher, the fortir processed "' ischrut in a suction device ' ^! 3 Vzv. Vrr \ ^{this T} -rihrleitur.r from re s aurt v: ird with a rrit of a delivery pump.

At the crossing point of the straight section ^ l and the conical section ^ O the Ecdenvand is a cylindrical one Abschirr-.v: and ^ 5 provided; e distance from this cylindrical, V. 'and thorns and flats turn when the agitator is operated 46 or the like, so that in this area there is still another Mixing effect is achieved.

In the disk 33 are, v; ie best from ^ ip. 3 visible c ¹ -. Bohrunren 50 is provided by. v; hich in ^ '"ihrv / erksbereich air present in Rich.tun <T to the Absaupvorrichtunr 43 abres ^ ur-t may be, since the area of the ring slot 42 CO by the rotation of the stirrer and through the Eewepunp with the feed pump.. Whirls or turbulences arise from the mixing device, the air pressed through the bores 50 is brought into the mix so that its pore content is increased even more.

The dwell time of the dry material passing through the S.hlitz 14 in the mixing device until the material to be mixed leaves the ring slot 42 is, for example, about 20 to 30 seconds, which not only significantly increases the mixing effect, but also the pore content, which, for example, remains freezing up to 25 ° can be.

Due to the fact that the paddles 34 the mix

through their 3chrär.kur ~ primarily right to cter. promote and eat that! - "isc: ~ ut only above the.? ir. ~ kar_al 37" ir. more faithful. State "atf lie:" he. karr., arise not only in the '' ischraun but also '.lter the ~ ir. ~ 23 congestion sralt 2c especially irr. storage space. of the dry material. The compartment 23 are dems-emäß next to the ^one to be dried also Lufttlaser. or Air cushion that, "vie already noticed. Stand under a low air pressure of a few tenths of a bar. Zisse Luft then becomes the. Dry goods are ^{supplied to the "ischrau 1} ?!" And the. "'Ischs-ut is mixed in.

^ ni "also circulates, the increase in the value of the content partly fine-grained or fine types of plaster, v.'ie r'.alk-Zenent- or Zerr.er.t-plasters which are in indoor or outdoor spaces ~ o.schir.ell einiari "upset v; erden know.

Y. ':' hr? Nd the Cbervar.dunr 22 a ~. Housing 3 is secured, a hinge is ^r: l provided vecken to the '"ischvorrichtune;, token to Reir.i'unrs ^, fold down to know.

With the newer.'IPen "mixing device, the air pores can be increased in all dryer. ^ en; en'lter der Vervendunr vcr. "Ischrohren ^Q lsc kcr.t" .nuierlichen "ischvorrichtur.Fer. - are / however decisive- ■ 'T.de" ertesserur.rer. accessible. . ^c c is zF with a? 'alk — lins - plaster ~: ~ a rev .'-''similar,"isehrohr an air tube ^p np" content of only "- 1 ~ ". ~ c ~ er: '.'"he ^ I - 20 with the Γ r.euerunrs ^T s" .Pen \ ^r orrichtun ° "Errei c"'"V nr: Me corresponding V.'erte] iuten f", r a KaIk- "■ - ^ rt-7utz" - 12 rer-enüter 20 - 25 "* ·" ^ρη 'a " ¹ known • ■. • ■""^, j. ·· ..."_; _ut . ., i _(-;. '.' _U ^{r c} ter - V.'erte 25 - 30 <-e ^ enüber '' of 5 - 50?.

''de'-: is the Frr ^ tr est '.' nd "' ¹ ^ - ■: *". .ies "utzes improved. The l ^ 'r ^ er""'" chzeit also leads

inhir :. in ^r; ^ ¹ IIe additions of the Trocker.fe ^ tifrn ^ rt ^ lr eire! "N ^ ere l"C'Z'"i*;to'.'rr f 'irunr ¹ ^ bC": and thus completely'"'r .diter to '■. "': un ^r körnen.

Claims (1)

PROTECTION CLAIMS 1. A device for continuously mixing a coarse-grained to powdery dry material, in particular a ready-to-use dry mortar, with a liquid and / or a foam material in a mixing chamber, which is upstream of a storage container for the dry material and a suction device for the material to be mixed downstream, characterized in that that a container filled with the dry material and air cushions storage space is provided between the reservoir and the mixing chamber at least, which is connected via calibrated slots, holes or the like on the one hand with the reservoir and on the other hand, with the mixing chamber. 2. Apparatus according to claim 1, characterized in that the slots, holes or the like is a coarse grain of the Dry goods are just larger in size. 3. Apparatus according to claim 1 or 2, wherein the provided with an approximately vertical drive shaft and a cylindrical feed chamber having mixing chamber at one end of the is connected substantially horizontal storage container, characterized in that the mixing chamber in the radial direction is expanded compared to the cylindrical feed space and is essentially airtight. ¹ J. Device according to claim 1 of, characterized in that a feed line for the liquid and / or the foam material is provided in the interior of the mixing chamber, the outlet openings of which are distributed over the entire mixing chamber. 5. Apparatus according to claim 4, characterized in that the supply line is ring-shaped and consists of a tube provided with bores, slots or the like. 6. Apparatus according to claim 4 or 5 »characterized in that that the annular feed line for the liquid and / or the foam material in the mixing chamber from the dry material feed through a stationary cylindrical baffle or the like separated is. 7. Apparatus according to claim 1 o.f., characterized in that that the agitator of the mixing chamber is attached to a stub shaft which is connected to the coaxial drive shaft, e.g. via a plug-in coupling is releasably connected. 8. Apparatus according to claim 1 o.f. with a TrojKe --- ig ;; tzuführ essentially by Schwerin ft, thus known, that the cylindrical feed space provided above the storage space provided with blades and / or knives attached to the drive shaft at least at its end facing the storage space is. 9. Device according to claim 1, characterized in that the blades and / or knives are provided at least directly above the calibrated slots, gaps, bores or the like which lead to the storage space . 10. The device according to claim 1 o.f., characterized in that that an annular slot surrounding a jacket of the drive shaft is provided for the passage of the dry material into the storage space is. 11. The device according to claim 1 o.f., characterized in that for the passage of the dry material from the storage space in the Mixing space an annular slot or the like between a stationary exact wall surrounding the drive shaft at a distance and a turntable or the like, optionally provided with blades. 12. The device according to claim 1 o.f., characterized in that the stirrer provided in the mixing chamber blades or the like which are mounted on a rotating disk or the like extending transversely across the mixing chamber, which is separated from the wall of the mixing chamber parallel to the axis of rotation by an annular slot. 13 · Device according to claim 12, characterized in that on the edge of the turntable or the like carrying the agitator, pins, plates running parallel to the wall of the mixing chamber or the like are attached. I ¹ J. Device according to claim 12 or 13, characterized in that the turntable or the like carrying the agitator is provided with small bores, holes or the like for sucking off air at a distance of about a third of the blade length in front of the wall of the mixing chamber housing. 15. The device according to claim 12 o.f., characterized. that on the underside of the turntable carrying the agitator Plates, mandrels, knives or the like are provided parallel to the axis of rotation. 16. The device according to claim 1 o.f., characterized in that the bottom wall adjoining the mixing chamber wall is designed in the shape of a cone and the central portion of the The bottom wall runs perpendicular to the axis of rotation. 17. The device according to claim 1 o.f., characterized in that the perpendicular to the axis of rotation portion of the bottom wall a ring designed as a chicane for the mix or the like carries, the upper edge of which over the lower edge of the Plates, mandrels, knives or the like protrudes. 18. The device according to claim 1 o.f., characterized in that the stub shaft carrying the agitator at its lower end is provided with an adapter for a coupling of the suction device and cfeß between the coupling and the rectilinear section the bottom wall an annular slot or the like is provided for sucking off the mix. 19. The device according to claim 1 o.f., characterized in that the upper wall of the mixing chamber on the the cylindrical feed space surrounding housing wall is attached and a hinge or the like for folding down the mixing chamber. 20. Device according to one of claims 1 to 1 &, characterized in that the upper wall of the mixing chamber on the the housing wall surrounding the cylindrical feed space is attached and the mixing chamber is detachably attached to the top wall. 21. The device according to claim 1 o.f., characterized in that the blades attached to the turntable or the like are attached with their inner edges to a cylinder surrounding the stub shaft at a distance and which closes off the storage space Turntable or the like carries.