EP0246394A2 - Device for mixing sand for foundry moulds or cores - Google Patents

Abstract

Apparatus for making molding sand has one or more housings defining upright cylindrical chambers and being movable with reference to a plate-like support to and from positions of register with an aperture in the support. Each chamber is normally closed at its upper end by a closure which has outlets for sand and one or more binder materials (such as clayey matter, pulverulent iron oxide, pulverized wood and/or others), and a rotary propeller is movable axially in each chamber to mix the ingredients in the circumferential direction as well as axially of the respective chamber.

Description

The invention relates to a device for mixing sand with preferably liquid binders and optionally additional additives such as solids from wood flour, iron oxide powder or the like. For the production of foundry molds or cores, with a cylindrical housing as a mixing chamber into which the individual components of the mixture in predetermined amounts are metered in, and with a mixing tool extending across the cross section of the mixing chamber and an emptying opening.

Devices of this type are known, devices for mixing the sand with additives being customary in foundries and in particular in the core factories as batch mixers, vibrating mixers or continuous mixers.

The batch mixers are round containers with a diameter / height ratio greater than 1. At the bottom, a slow-moving mixing blade turns through the sand. The sand must be weighed and fed in beforehand using a balance will. Or the sand is dosed through a volumetric container and added to the mixer. These methods of sand dosing are more complex in components and therefore cost. In addition, the height of the mixer becomes undesirably high due to the sand metering device installed above the batch mixer, especially since the mixer itself is above a machine.

The binders are subsequently added to the top of the filled sand pile. The mixing time and the quality are accordingly poor. A major disadvantage of the batch mixer is the need to clean the container after emptying. It is emptied through a side door. This means that sand residues remain on the mixer base and the mixing blade with every mixture. Depending on the mixture, the sand residues harden within about 30 minutes. out.

Vibration mixers, like the batch mixer, are also loaded via scales or volumetric sand dosing devices above the mixer. The vibrating mixer has no agitator. The mixing takes place by vibration of the entire mixing container. The dimensions are similar to that of the batch mixer, only smaller, since otherwise the masses, which would be set in motion by vibrators, would be too large.

This significantly limits performance.

The mixing quality is poor, particularly in the case of powdery additives with a smaller specific weight.

The problem with continuous mixers is that the length of the mixing screw is always full of the mix. The screw must be emptied to avoid hardening. With new mixing, the unmixed lead must to be removed separately. Another difficulty is that the snail must be removed at least every week and burned out of hard sand residues in the oven. In addition, the wear and the costs for the screw are high.

The object is therefore to create a mixing device of the type mentioned at the outset with which the mixing effort can be reduced, in particular the mixing time can be shortened and / or the mixing can be improved. In addition, an embodiment is to be possible in which the cleaning effort for the interior of the mixer and the mixing tool can be reduced or avoided and no mixed or unmixed sand remnants remain due to the process.

The solution to this problem according to the invention essentially consists in that the mixing tool is axially adjustable at least once over the length of the mixing chamber during the mixing process. As a result, the mixing of the filled components is not only effected at the respective location of a fixed mixing tool, but the axial adjustment has an additional mixing effect and, moreover, dead spaces in the mixing chamber that can occur with fixed mixing tools can be avoided. The mix is moved and circulated both in the circumferential direction and in the axial direction.

It is particularly expedient if the mixing tool can be axially moved back and forth in the mixing chamber with the drive running during the mixing process. The aforementioned mixing effect can be improved and intensified by these multiple opposing axial movements of the mixing tool. Mixing is correspondingly good.

A particularly expedient and simple to implement and also advantageous embodiment, especially for an embodiment of the invention which improves emptying, can consist in that the cylindrical mixing chamber is arranged vertically and the mixing tool can be moved up and / or down in it for mixing.

The axial extension of the mixing tool can be smaller than the mixing chamber, so that it can still remain completely within the mixing chamber during the mentioned axial movements, while a mixing tool extended in the axial direction could also wholly or partially emerge from the mixing chamber during these movements.

In order to keep the rotary drive power of the mixing tool low and still achieve good mixing quality, it is expedient according to a further development of the invention of its own worthy of protection if the ratio of the diameter to the length or height of the mixing chamber is at least one or less than one. Although a somewhat longer axial movement of the mixing tool is then required, the cross section of the segments of the substances to be mixed that are traversed thereby is smaller, so that the torque on the mixing tool can be smaller and this smaller cross section can also be better detected and mixed.

The filling opening for the sand and / or the filling opening or openings for additional mixture constituents are expediently provided on an end cover of the mixing chamber, and in the case of a vertically standing mixing chamber on an upper end cover and can pass through this lid. This results in a particularly simple construction and also the filling is simplified because the end cover does not have to be removed.

An embodiment of the invention of its own worthy of protection, which is particularly advantageous for an intimate and uniform mixing of all components, can consist in that all components of the mixture can be filled in simultaneously and evenly over the length or height of the mixing chamber and for the sand and the components of the mixture are preferably each provided with their own inlet to the interior of the mixing chamber. This results in practically interlocking columns of the individual mixture constituents during the filling, so that practically identical quantitative ratios of the mixture constituents already exist over each cross section of the mixing chamber. When the mixing tool then travels through the individual cross sections of the mixing chamber on its axial adjustment path, these mixing components, which are more or less adjacent to one another, are then thoroughly mixed, with only the components in a cross section that are already in the correct ratio having to be mixed. The mixing time required is correspondingly short.

A still further improvement in the mixing results if at least at the outlet for the binders and additives there are nozzles for distributing the binders and additives when filling into the mixing chamber. As a result, the sand that is filled at the same time is already saturated with these additives, so that not only individual columns of the mixing constituents are formed in the mixing chamber, but in addition to areas with sand only, areas also arise in which the sand and the binders have already penetrated, that is to say are partially premixed. Correspondingly, an intimate and uniform mixing of all components can take place even faster during the axial movement of the rotating mixing tool. This is particularly advantageous because, as a rule, the binders and additives are obtained in a significantly smaller amount than the sand volume, so that uniform distribution is often difficult and, in the case of mixing devices which do not function well, either a correspondingly longer mixing time or an overdose of these binders and additives is necessary is to have the minimum amount of binder and additives even in areas of poor mixing.

At least one impeller can be provided as a mixing tool. This is a particularly simple mixing tool which, however, brings about thorough mixing in the respective cross section and can also be easily adjusted in the axial direction. If necessary, however, several such impellers can also be arranged one behind the other in the axial direction.

In the case of a vertical arrangement of the mixing chamber, an embodiment of the invention is possible which allows the mixing chamber to be emptied particularly quickly and practically without residues, without additional measures, the filling into the subsequent molding or core shooting machine being simplified at the same time. This configuration can consist in that the tubular or cylindrical mixing chamber moves on a plate bar is mounted and the plate preferably has a perforation approximately from the cross section of the mixing chamber through which the mixing chamber can be pushed for emptying. The filling device can then be arranged in the core shooter below this perforation. When the mixing is complete, the mixing chamber can simply be pushed over the perforation, which empties it downwards. The mixing chamber is open at the bottom, so that it is initially sealed off from the plate, but is then emptied without further measures by moving the perforation. By arranging the perforation in the plate above a molding or core shooter there are practically no losses when filling the mixed sand into these machines and a risk of segregation is practically excluded due to the short distance from the mixing device into these subsequent machines.

Another possibility is that the mixing chamber is permanently installed over a perforation and is arranged between the mixing chamber and the perforation of a slide plate or the like. In this case, the slide plate must be removed to empty the mixing chamber.

A further embodiment of the invention can consist in that several mixing chambers are slidably arranged on the plate towards the same perforation or in each case towards a separate emptying perforation. This can increase the throughput of mixed sand. To move the mixing chamber, the cover with the feed lines and the agitator can be raised above the upper end of the vertical mixing chamber. It is then sufficient to first raise the agitator and lid slightly to empty the mixing chamber so that the mixing chamber can be easily pushed to the drainage perforation.

Embodiments of the invention with respect to the axial adjustment of the mixing tool and the lid holder are the subject of further claims.

Overall, especially when combining one or more of the features and measures described above, there is a device for mixing sand in foundries, which is simple in construction and nevertheless enables rapid and thorough mixing of the sand with the binders and additives. In this case, a relatively simple mixing tool with a comparatively small axial extent can be used, so that replacement after an expected wear is also inexpensive. At the same time, it follows that the mixing of the individual components not only takes place in the circumferential direction by the rotation of the mixing tool, but also that the individual cross sections of the filling of the mixing container are mixed axially.

The invention is described in more detail below with its details that are essential to it, using the drawing.

• Fig. 1 in schaubildlicher Darstellung eine Seitenansicht einer erfindungsgemäßen Mischvorrichtung,
• Fig. 2 eine Stirnansicht der Mischvorrichtung mit einem vertikalen Schnitt dur₇h die in diesem Falle vertikal angeordnete Mischkammer, wobei das Mischwerkzeug und der Deckel über die obere Stirnseite der Mischkammer angehoben sind,
• Fig. 3 in schematisierter Darstellung die gefüllte Mischkammer mit den einzelnen Mischungsbestandteilen kurz nach dem Einfüllen und kurz vor dem Absenken und axialen Verstellen des Mischwerkzeuges,
• Fig. 4 eine der Fig. 3 entsprechende Darstellung, jedoch ohne den Deckel und das Mischwerkzeug, wobei die Bindemittel und Zusatzstoffe schon beim Einfüllen etwas in den gleichzeitig eingefüllten Sand verteilt wurden,
• Fig. 5 eine Einfülldüse für Bindemittel oder Zusatzstoffe, mit deren Hilfe diese Stoffe in der in Fig. 4 dargestellten Weise in den gleichzeitig eingefüllten Sand vorverteilt werden können,
• Fig. 6 eine der Fig. 1 entsprechende Darstellung einer erfindungsgemaßen Vorrichtung mit zwei Mischkammern und
• Fig. 7 in vergrößertem Maßstab eine Einzelheit aus Fig. 2.

It shows :

• 1 is a side view of a mixing device according to the invention in a diagrammatic representation,
• 2 shows an end view of the mixing device with a vertical section through ₇ h of the mixing chamber arranged vertically in this case, the mixing tool and the lid being raised above the upper end side of the mixing chamber,
• 3 shows a schematic representation of the filled mixing chamber with the individual mixture components shortly after filling and shortly before lowering and axial adjustment of the mixing tool,
• 4 shows a representation corresponding to FIG. 3, but without the lid and the mixing tool, the binders and additives having already been distributed somewhat into the sand which was filled in at the same time,
• 5 shows a filling nozzle for binders or additives, with the aid of which these substances can be pre-distributed in the sand filled in at the same time as shown in FIG. 4,
• Fig. 6 is a representation corresponding to Fig. 1 of an inventive device with two mixing chambers and
• 7 shows a detail from FIG. 2 on an enlarged scale.

A device designated as a whole with 1 is used for mixing sand with preferably liquid binders and additional additives such as solids, e.g. B. wood flour, iron oxide powder or the like. To the sand to be prepared so that it is suitable for the production of foundry molds and especially cores in foundries.

The device 1 has a cylindrical housing as a mixing chamber 2, into which the individual components of the mixture are poured in predetermined amounts, which will be explained in more detail below with reference to FIGS. 3 to 5.

The device 1 includes, above all, a mixing tool 3, which extends over the cross section of the mixing chamber 2, and an emptying opening 4.

The double arrow Pf 1 in Fig. 1, 2 and 6 indicates that the mixing tool 3 is axially adjustable over the length of the mixing chamber 2 during the mixing process.
Thus, while the mixing tool 3 rotates to perform its mixer function, it is also moved axially, so that the entire contents of the mixing chamber 2 are gradually grasped and processed by the mixing tool 3. Thus, not only is the respective cross-section of the mixture recorded and mixed and stirred by a stationary mixing tool, but the material to be mixed is also circulated in the axial direction of the mixing chamber 2.

The double arrow makes it clear that the mixing tool 3 - of course with the drive running - is not only axially adjusted axially in the mixing chamber 2 during the mixing process, but is also adjustable to and fro. This can Float can of course also be performed multiple times.

In all of the exemplary embodiments shown, the cylindrical mixing chamber 2 is arranged vertically and the mixing tool 3 can thus be moved up and down in it for mixing.

It can again be seen in all exemplary embodiments that the mixing tool 3 is smaller in its axial extent than the mixing chamber 2. Of course, a mixing tool 3 would also be conceivable, the extent of which corresponds approximately to the axial length or the height of the mixing chamber and can nevertheless be moved up and down in it, for which purpose it would then have to emerge via at least one end face of the mixing chamber 2. Due to the mentioned dimension of the mixing tool 3 smaller than that of the mixing chamber 2, however, the mixing chamber 2 can advantageously remain completely closed during the mixing process.

2 that the ratio of the diameter to the length or height of the mixing chamber 2 is less than one. It is thereby achieved that the mixing tool 3 and the cross-section to be machined with a relatively large internal volume of the mixing chamber 2 need not be so large, so that the rotary drive power for the mixing tool 3 with a good or even improved mixing quality is lower than with an inverse ratio of Dimensions can be chosen.

Especially in Figures 2 and 3 you can see that the Filling opening 5 with a corresponding supply line 6 for the sand and the filling openings 7 with associated supply lines 8 for additional mixture constituents are seen on an end cover 9 of the mixing chamber 2 and pass through this upper cover 9 in the exemplary embodiment. This makes it possible to fill all mixture components in the correct dosed composition simultaneously and evenly distributed evenly over the length or height of the mixing chamber 2, with a separate inlet to the interior of the mixing chamber 2 being provided for the sand and the mixture components, as shown in FIGS Figures 3 and 4 is indicated. It is made clear by these figures that after filling, the same amounts of the substances to be mixed are initially arranged over practically all superimposed cross sections in the mixing chamber 2, but these are still more or less separated from one another. 3 shows three pillars of binders and additives, which are located within the surrounding sand, not shown in more detail. If the mixing tool 3 is now rotated up and down within a mixing chamber 2 filled in this way, all the cross sections of the mixing chamber 2 are mixed in succession, but at the same time there is also an axial distribution and mixing, so that overall a very uniform mixing within the mixing chamber 2 can be manufactured.

5 shows part of the cover 9 with a feed line leading through it. It can be seen that a nozzle 10 is provided at the outlet of the feeder 8 for binders or additives, which allows a better distribution of the binders and additives causes when filling into the mixing chamber 2. This results in columns of material after filling, as indicated in FIG. 4. Binder and additives are then already mixed with sand over a certain cross-section or have already penetrated the sand to the extent shown, so that the subsequent mixing is quicker or the uniformity of the distribution can be achieved more quickly or can be better ensured.

In the exemplary embodiment, at least one impeller is provided as the mixing tool 3. It is obvious that several impellers could also be arranged one behind the other in the axial direction.

In Figures 1, 2 and 6 it can be seen that the tubular or cylindrical mixing chamber 2 is open at the bottom, this emptying opening 4 of the mixing chamber 3 extending over its entire cross section, so that no residues or odor on any opening edge when emptying. Like. Can remain. The mixing chamber 2 is slidably mounted for emptying on a - preferably abrasion-resistant - plate 11 and this plate 11 has a perforation 12 which in turn corresponds at least approximately to the cross section of the mixing chamber 2 and over which the mixing chamber 2 can be pushed for emptying. If the emptying opening 4 of the mixing chamber 3 is made to overlap with the perforation 12 in the plate 11 by appropriate displacement of the mixing chamber or possibly also the plate 11, the mixed contents of the mixing chamber 2 can fall out of the mixing chamber 3 unhindered, in an advantageous manner there is no possibility that residues remain in the mixing chamber 2. This ensures ensures that the metered amount of mixed sand reaches its destination and a subsequent mixture, possibly modified in its composition, cannot be falsified.

In this case, the perforation 12 in the plate 11 can expediently be arranged above a molding or core shooting machine, so that the mixed sand immediately reaches the corresponding machine.

It should also be mentioned that the mixing chamber 2 could also be permanently installed over a perforation 12 and then a slide plate or the like could be arranged between the mixing chamber 2 and the perforation 12. In this case, the mixing chamber 2 would remain stationary while the slide plate would have to be opened.

Fig. 6 indicates that several - in this case two - mixing chambers 2 on the plate 11 can be arranged displaceably towards the same perforation 12. Of course, however, it would also be possible to provide separate emptying holes 12 for each mixing chamber 2. Either a machine located under the perforation 12 can be filled more often and faster in this way, or several machines can be fed simultaneously or in any order from their own mixing chamber 2.

In the figures it is indicated that for moving the mixing chamber 2, the cover 9 with the feed lines 6 and 8 and the agitator 3 can be lifted over the upper end face of the mixing chamber 2, so that the mixing chamber is free and easy towards the perforation 12 without these installations and can be moved back to the mixed position.

For the axial adjustment of the mixing tool 3 or the impeller, be it during the mixing process according to arrow Pf 1 or be lifted over the end face of the mixing chamber 2 for its displacement, this is attached with its drive motor 13 to a bearing plate 14 hanging below it Which bearing plate 14 can be displaced relative to guide rails 15 or rods with the aid of a linear drive 16, in the exemplary embodiment with the aid of a working cylinder. The guide rails 15 and the drive 16 for the adjustment of the bearing plate 14 are arranged parallel to the axis of rotation of the mixing tool 3 and to the central axis of the mixing chamber 2. This construction allows both the upward and downward movement of the mixing tool 3 during the mixing process and the lifting of the mixing tool 3 above the mixing chamber 2 upwards for its displacement, because the drive of the mixing tool 3 is supported by the motor 13 in the bearing plate 14 and can be arranged, from which a corresponding axis or shaft 17 leads to the actual mixing tool 3, wherein the distances between all these parts can remain rigid. The upward and downward movement of the mixing tool 3 therefore does not require flexible power transmission on the rotary drive of this mixing tool 3.

Especially in FIGS. 1 and 2, it can also be seen that a holder 18 is provided for the cover 9 of the mixing chamber 2 having the feed lines 6 and 8, lifting cylinders 19 or the like acting between this holder 18 and the cover 9 the pressing of the lid 9 during the mixing process and on the other hand the lifting of the lid 9 are provided for a displacement of the mixing chamber 2 in order to empty it. The lid 9 must namely on the one hand, remain firmly on the mixing chamber 2 during the up and down movement of the mixing tool 3 during the mixing process, which is why the drive shaft 17 passes through a corresponding central opening 20 of the cover 9. On the other hand, it must also be able to be raised for the displacement of the mixing chamber 2. Two lifting cylinders 19 of this type can be seen, and two working cylinders 16 are also provided for lifting the bearing plate 14 and for moving the bearing plate 14 up and down with the mixing tool 3 for a drive movement that is as symmetrical as possible. To move the mixing chamber 2 towards the perforation 12, however, a single working cylinder 21 is sufficient.

In the exemplary embodiment, holding arms 22 are provided laterally to the side of the mixing chamber 2 as a holder 18 for the cover 9, outside of its displacement path.

In Figures 1, 2 and 3 it can still be seen that the mixing chamber 2 in the edge region of its emptying opening 4 is gripped by a slide 23, on which the working cylinder 21 engages, and that the holding arms of the holder 18 for the cover 9 are out of the way of this Slider 23 are attached to the guides 24 for the slider 23 in the embodiment.

In Figures 1 and 6 it is also shown that a cleaning device 25 can be provided for the mixing chamber 2, which can be introduced into the mixing chamber 2 in its emptying position in a manner to be described.

The cleaning device 25 for the mixing chamber is back and forth in the direction of its central axis movable, which means an up and down movement in the exemplary embodiment. In the starting position, the cleaning device 25 is at a distance from the entry of the mixing chamber 2, that is, in the vertical arrangement shown, above the mixing chamber 2. If the mixing chamber is moved from the position shown in FIGS. 1 and 6 to the emptying position, as described above it is then automatically located below the cleaning device 25.

In a particularly expedient manner, the cleaning device is arranged such that it can be moved up and down axially above the perforation 12 of the plate 11 when the mixing chamber 2 is arranged vertically. In the emptying position of the mixing chamber, it can therefore be introduced into the mixing chamber 2 from the position shown and moved downwards in order to expel or remove any residues of the mixture which are stuck or stuck in the mixing chamber. Then it is moved up again to the position shown.

The cleaning device 25 has a slide 26 which corresponds approximately to the cross-section of the mixing chamber 2 in its outer contour and is movable axially through the mixing chamber. As a result, the mixing chamber 2 can be cleaned by mechanical means alone. The entire cleaning device 25 can be moved back and forth together with the mixing tool 3, that is to say it can be moved up and down in the vertical arrangement of the mixing chamber 2 shown in the exemplary embodiment. This is achieved in a simple manner in that the cleaning device 25 is attached to the same bearing plate 14 as the mixing tool 3 and is at a distance from the mixing tool 3 which preferably corresponds to the displacement of the mixing chamber 2 from its mixing position into the emptying position. The cleaning device 25 is therefore moved up and down synchronously with the mixing tool 3, even if it does not have to carry out any cleaning work, but this saves a separate drive for this cleaning device or a subsequent coupling or the like. If, after the mixing process, the mixing tool 3 is removed upwards from the mixing chamber 2 in the manner described and this is then moved into the emptying position, it automatically gets under the cleaning device 25.

In the exemplary embodiment, the cleaning device 25 has two parallel plates 28, leaving an air gap 27 between them, which together form the aforementioned slide 26 and are connected to a compressed air connection, the gap 27 between the plates 28 serving as an outlet for the cleaning air when the cleaning device is moved 25 is directed through the mixing chamber 2 against the wall thereof. With the appropriate air pressure and the corresponding narrowness of the air gap 27, a very sharp, but over the entire circumferential air jet can be generated and directed onto the mixing chamber wall, so that stuck particles are safely released and then down through the emptying opening 4 and the perforation 12 can fall out. In addition, the plates or at least the rear plate 28 in the feed direction can also carry out mechanical cleaning.

The holder for the plate-shaped cleaning device 25 can be designed as a hollow rod 29, which at the same time as a compressed air supply in the intermediate space between the two plates 28 forming the cleaning device 25 is used.

The aforementioned plate 28 of the cleaning device 25, which is further away from the emptying opening 4, could have a seal (not shown in more detail) with respect to the wall of the mixing chamber in order to direct the cleaning air as completely as possible in the direction of emptying and to enable the already mentioned additional mechanical action on the wall of the mixing chamber.

In the exemplary embodiment, the cleaning device 25 and its holding rod 29, which serves as a feed pipe, are held by a strip 30 which is fastened to a narrow side of the bearing plate 14, in this case angularly shaped, the holding rod being expediently arranged above the center of the perforations 12 in the plate 11.

When looking at FIG. 7 in connection with FIG. 2, it can be seen that at the lower edge around the emptying opening 4 of the mixing chamber 2, a groove 31 open at the bottom can circulate, which has at least one compressed air connection 32, through which at least during the displacement of the mixing chamber 2 Compressed air can be supplied on the plate 11 of the groove 31. The arrows indicate that this not only reduces the friction with respect to the plate 11, but also repeatedly blows the contents of the mixing chamber 2 towards the center thereof and thus prevents the plate 11 and its surroundings from being contaminated by the contents of the mixing chamber 2 becomes.

To maintain the smooth exit of the mixing chamber with the same wall thickness, is at the bottom At the edge of the mixing chamber 2, an outer circumferential collar 33 of larger diameter than the mixing chamber itself is provided, on its side facing in the direction of emptying, in the exemplary embodiment the underside, the groove 31 is open, so that the air pressed into the groove 31 is blown against the plate 11. The air inlets 32 are crimped on the outer edge or, as shown in FIG. 7, on the side of the collar 33 facing away from the groove opening.

All features and construction details shown in the description, the summary, the claims and the drawing can have significant meaning both individually and in any combination with one another.

Claims (31)

1. Device (1) for mixing sand with preferably liquid binders and possibly additional additives such as solids from wood flour, iron oxide powder or the like, for the production of foundry molds or cores, with a cylindrical housing as a mixing chamber (2), in which the individual components of the mixture are metered in in predetermined quantities, and with a mixing tool (3) extending over the cross section of the mixing chamber (2) and an emptying opening, characterized in that the mixing tool (3) during the mixing process at least once axially over the length of the Mixing chamber (2) is adjustable. 2. Apparatus according to claim 1, characterized in that the mixing tool (3) with the drive running during the mixing process axially in the mixing chamber (2) is adjustable to and fro. 3. Apparatus according to claim 1 or 2, characterized in that the cylindrical mixing chamber (2) arranged vertically and the mixing tool (3) can be moved up and / or down in it for mixing. 4. Device according to one of claims 1 to 3, characterized in that the mixing tool (3) is smaller in its axial extent than the mixing chamber (2). 5. The device in particular according to the preamble of claim 1 or one of claims 1 to 4, characterized in that the ratio of the diameter to the length or height of the mixing chamber (2) is at least one or less than one. 6. Device according to one of claims 1 to 5, characterized in that the filling opening (5) for the sand and / or the filling opening (7) for additional mixture components on an end cover (9) of the mixing chamber (2), with vertical Mixing chamber are provided on the upper cover and pass through this cover (9). 7. The device in particular according to one of claims 1 to 6, characterized in that all components of the mixture can be filled in simultaneously and uniformly over the length or height of the mixing chamber (2), and for the sand and the components of the mixture each preferably has its own inlet to the interior the mixing chamber (2) is provided. 8. Device according to one of claims 1 to 7, characterized in that at the outlet at least the feeds for the binder and additives nozzles (10) for distributing the binder and additives at Filling into the mixing chamber (2) are provided. 9. Device according to one of claims 1 to 8, characterized in that at least one impeller is provided as a mixing tool (3). 10. Device according to one of claims 1 to 9, characterized in that the tubular or cylindrical mixing chamber (2) is open at the bottom and slidably mounted on a plate (11) and the plate (11) preferably has at least one perforation (12) approximately of the cross section of the mixing chamber (2) over which the mixing chamber (2) can be pushed for emptying. 11. The device according to one of claims 1 to 10, characterized in that the emptying opening (4) of the mixing chamber (3) extends over its entire cross section. 12. Device according to one of claims 1 to 11, characterized in that the perforation (12) in the plate (11) is arranged above a molding or core shooter. 13. Device according to one of claims 1 to 9, 11 or 12, characterized in that the mixing chamber (2) is permanently installed over a perforation (12) and a slide plate or the like between the mixing chamber (2) and perforation (12). is arranged. 14. Device according to one of the preceding claims, characterized in that a plurality of mixing chambers (2) on the plate (11) to the same perforation (12) or each to its own emptying perforation (12) are slidably arranged. 5. Device according to one of claims 1 to -14, characterized in that for moving the mixing chamber (2) of the cover (9) with the feed lines (6, 8) and the agitator (3) via the upper end face of the mixing chamber (2nd ) can be raised. 16. The device according to one of claims 1 to 15, characterized in that for the axial adjustment of the mixing tool (3) or impeller this is fastened with its drive motor (13) to a bearing plate (14) which is relative to guide rails (15) or rods is displaceable with the aid of a linear drive (16), preferably a working cylinder, the guide bars (15) and the drive (16) for adjusting the bearing plate (14) being arranged parallel to the axis of the mixing tool (3) and the mixing chamber (2) are. [7th Device according to one of claims 1 to 16, characterized in that a holder (18) is provided for the cover (9) of the mixing chamber (2) which has the feed lines (6, 8) and the like, and between this holder (18) and the cover (9) lifting cylinder (19) or the like. For pressing the cover (9) during the mixing process and possibly lifting the cover (9) for moving the mixing chamber (2) are provided for emptying. 18. Device according to one of claims 1 to 17, characterized in that holding arms are provided as the holder (18) and the cover (9) to the side of the mixing chamber (2) outside of its displacement downward. 19. Device according to one of claims 1 to 18, characterized in that the mixing chamber (2) is preferably .in the edge region of its emptying opening (4) by a slide (23) and that the holding arms (18) for the lid (9) outside the slide path, preferably attached to the guides (24) for the slide (23). 20. Device according to one of the preceding claims, characterized in that a cleaning device (25) for the mixing chamber (2) is provided, which can be inserted into the mixing chamber (2) in its emptying position. 21. Device according to one of claims 1 to 20, characterized in that the cleaning device (25) for the mixing chamber (2) can be moved back and forth in the direction of its central axis and in the starting position at a distance before the entry of the mixing chamber (2), with vertical arrangement of the mixing chamber (2) above the mixing chamber (2) is arranged. 22. Device according to one of claims 1 to 21, characterized in that the cleaning device is arranged in a vertically arranged mixing chamber (2) axially above and above the perforation (12) of the plate (11) movable up and down. 23. Device according to one of claims 1 to 22, characterized in that the cleaning device (25) has a cross section of the mixing chamber (2) in its outer contour approximately corresponding slide (26) which is axially movable through the mixing chamber. 24. Device according to one of claims 1 to 23, characterized in that the cleaning device (25) with the mixing tool (3) together back and forth, with vertical mixing chamber (2) can be moved up and down. 25. The device according to any one of claims 1 to 24, characterized in that the cleaning device (25) on the same bearing plate (14) as the mixing tool (3) is attached and from the mixing tool (3) has a distance which is preferably the displacement of Mixing chamber (2) from its mixing position corresponds to the emptying position. 26. Device according to one of claims 1 to 25, characterized in that the cleaning device (25) has two parallel plates (28) which leave an air gap (27) between them and which are connected to a compressed air connection, the gap (27) between the plates (28) as an outlet for the cleaning air when moving the cleaning device (25) through the mixing chamber (2) against the wall thereof. 27. The device according to one of claims 1 to 26, characterized in that the holder for the plate-shaped cleaning device (25) is designed as a hollow rod (29) which at the same time as a compressed air supply in the space between the two plates forming the cleaning device (25) (28) serves. 28. Device according to one of claims 1 to 27, characterized in that the plate (28) further away from the emptying opening (4) of the cleaning device direction (25) has a seal against the wall of the mixing chamber (2). 29. The device according to any one of claims 1 to 28, characterized in that the cleaning device (25) and its holding rod (29) serving as a feed pipe are held by a bar (30) which is fastened to a narrow side of the bearing plate (14) and is optionally angled and the holding rod (29) is preferably arranged above the center of the perforation (12) of the plate '(11). 30. Device according to one of the preceding claims, characterized in that at the lower edge around the emptying opening (4) of the mixing chamber (2) rotates a downwardly open groove (31) which has at least one compressed air connection (32) through which at least during compressed air can be fed to the displacement of the mixing chamber (2) of the groove (31). 31. The device according to one of claims 1 to 30, characterized in that at the lower edge of the mixing chamber (2) an outer circumferential collar (39) of larger diameter than the mixing chamber (2) itself is provided, on the side facing in the emptying direction, preferably the Underside, the groove (31) is open, and that the air inlets (32) are arranged on the outer edge or on the side of the collar (39) facing away from the groove opening.

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