EP1250951A1 - Device for mixing and dispensing of in particular viscous or pasty materials - Google Patents

Abstract

A mixer assembly for pastes and highly viscous substances has a mixer vessel (1) and an extruder. The vessel has a movable mixer tool (9) and is closed by a base (3) and a lid (5). Especially, a linear guide (7) extends through the lid, and moves the mixer tool as required. The base acts as an extruder by movement towards the lid. The vessel main axis (10) is horizontal. The base moves along a horizontal plane to extrude the mixture. Ingredients are introduced to the vessel through valve-controlled inlets in the lid. The lid further has connector fittings (43) for pressure and vacuum systems, and a discharge outlet. The vessel further has a screen which protects the vessel inner chamber from external influence during expulsion of the mixed ingredients. The chamber also has an inlet for inert gas which protects the inner walls from unwanted side-reactions. The chamber sidewalls (11) are heated to a pre-determined temperature. The chamber (12) is cylindrical and the base has an anti-rotational and anti-tilt shafts (33, 35).

Description

Technical field

The invention relates to a device according to the preamble of the claim 1.

State of the art

EP 0 196 291 describes a mixing and squeezing device for mixing viscous or pasty masses described. In the known mixing device was in a mixing vessel a rotatably mounted mixer shaft with a mixing tool arranged, which was also axially movable. Pierced the mixer shaft centric a press plate, which on this shaft to expel the mix was also axially movable. The press plate was opposite the mixer shaft as well provided with seals against the circular cylindrical inner wall of the mixing vessel. An outlet for the mix to be pressed with the press plate was in the floor arranged of the mixing vessel.

The known mixing and squeezing device was extremely susceptible to failure during operation and generally tended to leak, especially when squeezing.

Presentation of the invention Object of the invention

The object of the invention is to provide a device for mixing in particular viscous and pasty materials in a mixing vessel and for driving out to create the mixed material produced from this vessel, which, in contrast to that of EP 0 196 291 works without problems.

Solution of the task

The object is achieved in that here, in contrast to EP 0 196 291 the unit for mixing the materials and the unit for driving out of the mixed material arranged in one and the same mixing vessel but clearly from one another are trained separately. According to the invention, only a linear guide engages with the mixing tool arranged on it through the cover part. The expulsion the mix is independent of the mixing arrangement by a piston acting bottom part made. The units and used for the mix the units used for the expulsion are, except for an outlet connection in the Lid part, completely mechanically separated from each other.

This arrangement enables an extremely stable mounting of the axially displaceable Mixer shaft as well as a relatively structurally simple, clear and thus a clean-looking seal against the outside. Also the bottom part used for pressing can now be very stable and secure against tipping be designed.

The device with its mixing vessel and the associated drive elements for the pressing out, the axial displacement of the mixer shaft and the movements of the mixing tool can in a linear structure in any position, be arranged standing or lying; but preferably a horizontal one Lineup chosen. By placing it horizontally - the geometric axis of the Mixing vessel is approximately horizontal; the axial displacements also take place approximately horizontal - maintenance of the device is significantly easier to carry out than with a vertically standing device that requires scaffold-like structures would. All elements and units are thus possibly without scaffolding from the floor accessible with a small easel.

Now that the mix is pressed out by moving the bottom part in Direction towards the cover part, the cover part is fixed with an outlet opening provided for the mix. Preferably one becomes the fixed cover part also provided with the inlets for the materials to be mixed; you also become everyone other connections, for example for a vacuum or pressurization on Attach the cover part. You then only have one place to which all lines are connected are lead. For cleaning and service purposes, the lid part is preferred removable from the mixing vessel, preferably removable (due to the heavy weight) form.

The bottom part is for pressing out the mix in the manner of a piston in the interior the mixing vessel, which then represents the cylinder wall for the piston, movable. The bottom part has a seal in the edge area, and the cylinder wall is also sufficiently smooth; However, there may always be residues of mixed goods stick when moving the piston towards the cover part and stick through slide the seal through. So that the minimal residues are not with the ambient air a cover hood is available if it can react while curing. This cover seals when the mix is driven out by the moving Bottom part of the vessel interior that is released towards the outside. It is in the hood area there is also an inlet for preferably a neutral gas around which To be able to flood the space between the hood and the base part.

The side wall of the vessel is designed in such a way that it has to be predetermined Temperature can be applied. Depending on the mix or the materials to be mixed can therefore be a temperature selected above or below the ambient temperature be specified. The temperature exposure is preferred with an in Make the heat transfer medium circulating in the vessel wall. The remedy can flow in pipelines laid in the wall; you can also have a double wall provide with a space.

Any cross-section of the interior of the mixing vessel can be selected become; for the sake of simplicity, however, one will choose a circular cylindrical one. With a circular cylindrical cross-section, there are no corners in which not mixed material could remain.

Both the bottom part acting as a piston and the mixing tool are preferred secured against twisting and tipping. Such a backup is eccentrically arranged by at least one to the axially acting shaft another wave reachable. It is preferable not only to become an eccentric extra Wave, but two opposing waves or three or more in Arrange the same angular distance.

So as little as possible, d. H. no mix at all when pressed against the interior walls the mixing vessel and also not on the axially movable mixer shaft adheres, rinsed seals are used there.

Brief description of the drawings

Fig. 1

eine Seitenansicht der erfindungsgemäßen Vorrichtung,

Fig. 2

eine Draufsicht auf die in Figur 1 dargestellte Vorrichtung, wobei das Mischgefäß geschnitten dargestellt ist,

Fig. 3

eine zu Figur 1 analoge Darstellung, wobei sich jedoch der Deckelteil der Vorrichtung in einer Service- bzw. Reinigungsstellung, entfernt vom Mischgefäß, befindet,

Fig. 4

eine zu Figur 2 analoge Darstellung der Vorrichtung mit analog zu Figur 3 verfahrenem Deckelteil,

Fig. 5

eine Draufsicht auf den Deckelteil der in den Figuren 1 bis 3 dargestellten Vorrichtung, wobei hier die Ein- und Auslässe mit abgenommenen Verbindungselementen dargestellt sind,

Fig. 6

einen Querschnitt durch eine Dichtungspackung, wie sie zum Abdichten einer in das Mischgefäß eingeführten Welle mit einem Mischwerkzeug, verwendet wird und

Fig. 7

ein Prinzipschema der erfindungsgemäßen Vorrichtung mit beispielsweisen Anschlüssen.

Examples of the device according to the invention are explained in more detail below with reference to the following drawings. Further advantages of the invention result from the description text. Show it:

Fig. 1

a side view of the device according to the invention,

Fig. 2

2 shows a top view of the device shown in FIG. 1 , the mixing vessel being shown in section,

Fig. 3

2 shows a representation analogous to FIG. 1 , but with the cover part of the device in a service or cleaning position, away from the mixing vessel,

Fig. 4

2 shows a representation of the device analogous to FIG. 2 with the cover part moved analogously to FIG. 3 ,

Fig. 5

2 shows a top view of the cover part of the device shown in FIGS. 1 to 3 , the inlets and outlets being shown here with the connecting elements removed,

Fig. 6

a cross section through a packing, as used for sealing a shaft inserted into the mixing vessel with a mixing tool, and

Fig. 7

a schematic diagram of the device according to the invention with example connections.

Ways of Carrying Out the Invention

The device shown in FIGS. 1 and 2 for mixing particularly viscous or pasty materials or mixed material has a mixing vessel 1, which is closed with a base part and a cover part 3 or 5 opposite it. A shaft 7 extends through the cover part 5 as a linear guide for a mixing tool 9. The shaft 7 is arranged in an approximately horizontal geometric axis 10 of the mixing vessel 1 . The inner wall 11 of the interior 12 of the mixing vessel 1 is circular cylindrical. The shaft 7 is guided through a sealing packing 13 in the cover part 5 . The shaft 7 and thus the mixing tool 9 are axially displaceable in the interior 12 by means of a horizontally acting displacement device 15 , as indicated by the double arrow 14 .

The displacement device 15 is about four carriers 17a to 17d on the base 19 and by means of two guide shafts 20a and 20b outside with flanges 21a and 21b on the lid part 5 is fixed. Furthermore, the displacement device 15 has a so-called hydraulic motor 23 for the displacement movement of the shaft 7. The guide shafts 20a and 20b give the guide device 15 stability against buckling and twisting.

With a manually actuated further displacement device 16 , the lid part 5 can be removed from the mixing vessel 1 for service and cleaning purposes when the fastening clips 25 are released. Here, the cover part 5 rolls on two supports 26a and 26b provided with wheels 24a and 24b . This position is shown in Figures 3 and 4 .

The base part 3 can be displaced horizontally (axially) in the axial direction of the mixing vessel 1 by means of a displacement device 27 . The displacement device 27 is connected to the mixing vessel 1 on the outside via lateral supports 29a and 29b . The two beams 29a and 29b also rest on four supports 30a to 30d connected to the foundation 19 . The cylindrical bottom part 3 is also sealed on its edge sides by a packing 31 similar to that 13 of the shafts 7 against the inner wall 11 .

The displacement device 27 has a shaft 33 in the geometric axis 10 for displacing the base part 3 for the pressing out of the mixed material. A further eccentrically arranged shaft 35 is provided to prevent the base plate 3 from tilting when pressed out. The bottom part 3 is covered with a cover 37 . The cover 37 covers an interior part 39 that becomes free when pressed. This freed interior space 39 can be filled (flooded) with a neutral gas as a gas supply via a connection 40 indicated in FIG. 7 , so that the mixed material adhering to the inner wall 11 cannot harden due to environmental conditions.

In contrast to EP 0 196 291, all the inlets relating to the introduction of the materials for the mix to be produced and the removal of the finished mix from the cover part 5 are arranged here. The lid part 5 shown in Figure 5 has at its center a passage 41 7 to lie in the geometric axis 10 of the mixing vessel coming wave left and right carrying 41 are each a flange 21 a and 21 b of the guide shafts 20a or 20b arranged. Above the passage 41 there is a connection 43 for pressurizing or vacuuming the mixing space (interior 12 ). Through the connections 45, 47 and 49 , materials for producing the mixed material can be introduced. For example, a pipe conveyor for introducing powdery material can be connected to the connection 51 . The outlet 53 for the material to be mixed with the mixing tool 9 is arranged below the central passage 41 . To the left and right of the outlet 53 there is a reserve connection 54 and a connection 55 for sampling. The cylinders 43a, 45a, 47a, 49a, 51a, 53a, 54a and 55a lying outside in FIG. 5 are pneumatic drives belonging to the inlets and outlets 43, 45, 47, 49, 51, 53, 54 and 55.

The axial dimension of the bearing packing 63a-d arranged in the passage 41 for the mixer shaft 7 has been chosen so large that it can absorb tilting moments that occur during mixing. The seal pack 13a and 13b has a through opening 61 for the shaft 7. In the end of the seal pack 13a adjacent to the mixing chamber 12 there is a first bearing belt 63b , which is followed by three further bearing belts 63a to 63c at a distance which corresponds to approximately half the pack length , A flushing groove 65 is provided between the seals 63a and 63b . This flushing groove 65 is connected to a liquid inlet and an outlet 67a and 67b . A medium compatible with the mix is used as the rinsing liquid.

FIG. 7 shows a basic circuit diagram of the entire device with the connections necessary for operation. In order to be able to present the large number of connections at least to some extent clearly, the cover part 5 is shown twice, although only once. The connections in the cover part 5 already described above for a pressure or vacuum application 43, the mixture outlet 53, the sampling outlet 55, the reserve connection 54, the “powder inlet” 51, the material inlets 45, 47 and 49 will not be discussed further. The cover 37 above the base part 3 has a connection 69, here for example for nitrogen. The nitrogen serves, as already stated above, that in the smallest quantities reaching the space 39 between the cover 37 and the base part 3 mix z. B. cannot harden. A removal or recycling of the nitrogen is not provided here; it escapes into the environment. If desired, a route can of course be carried out via a pipe system.

For heating (if necessary also cooling) of the mixing vessel 1 and the mixing material is located an inlet 71 for a heating fluid at the bottom of the mixing vessel 1. Through the connection 72 of this heating fluid is discharged from the jacket of the mixing vessel. 1 The rinsing liquid for the packing 13 is provided with the system 73 and supplied to the packing 13 via the flexible lines 74a and 74b . An analog system 75 is provided for the rinsing fluid of the sealing packing 31 of the base part 3 ; the supply line is via flexible lines 77a and 77b. The mixing material is pressed out by means of a hydraulic system 79 which is controlled by a computer 80 . An analog system 81 is used to drive the mixer shaft 7 with the mixing tool 9.

The mixing and squeezing device described above is particularly suitable for the production (mixing) of viscous or pasty materials (masses); it can also be used to mix low-viscosity materials and then expel them into containers become. Since the device for different mixes with different Viscosity and different filling capacity can be produced for the mixing vessel, the dimensions and total weight ratios of the device also change. If, for example, silicone-like sealing compounds are produced, one can Device already ten meters long and almost three meters high with a total weight of about twenty tons.

In the above, curing is cited as a chemical process with the ambient air. This expression stands for all possible chemical processes that can take place with the ambient air, the ambient temperature or other events. Nitrogen is specified above as protective gas in room 39 . Of course, other protective gases can also be used. The gas to be used depends on the properties of the mix.

Claims (8)

Device for mixing particularly viscous or pasty materials in a mixing vessel (1) and for expelling the mixed material produced from this vessel (1), the vessel (1) being closed with a bottom part (3) and a lid part (5) opposite this and in the mixing vessel (1) there is a movably movable mixing tool (9) , characterized in that a linear guide (7) engages with the cover part (5) , with which the mixing tool (9) can be moved in a variable position, and the bottom part (3 ) for expelling the mixture in the vessel (1) against the cover part (5) is designed to be displaceable. Device according to claim 1, characterized in that the vessel axis (10) is arranged approximately horizontally and the bottom part (3) is designed to be movable approximately horizontally for expelling the mixture. Device according to claim 1 or 2, characterized in that materials for the mixed products can be introduced through inlets (45, 47, 49, 51) in the cover part (5) , preferably closable with valves, and in particular a connection (43), a pressure - or vacuum application and above all an outlet (53) through which the mix can be driven out of the mixing vessel (1) into containers. Device according to one of claims 1 to 3, characterized by a covering hood (37) which seals the inner part of the vessel (39) which is released when the mixed material is expelled through the displaced base part (3) , preferably allows gas to be applied to the environment, and one Inlet (69) for a neutral gas into this free space (39), so that due to ambient conditions no reaction of the mixture adhering to the inner wall (11) can take place. Device according to one of claims 1 to 4, characterized in that a predetermined temperature can be applied to the lateral vessel wall (11) . Device according to one of claims 1 to 5, characterized in that the mixing vessel interior (12) is designed as a circular cylinder and the bottom part (3) is preferably secured against rotation and in particular against tilting, in particular is designed to be displaceable by an axially acting shaft (33) and in particular the rotation and in particular the tilting protection is carried out by at least one further eccentrically arranged coaxial shaft (35) . Device according to one of claims 1 to 6, characterized in that the linear guide (7) which extends through the cover part (5 ) and preferably the bottom part (3) have a flushed sealing unit (13; 31) . Device according to one of claims 1 to 7, characterized in that the cover part (5) for cleaning and service work is designed to be removable from the mixing vessel (1) .

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