EP1252922A1 - Commercial scale device for mixing and dispensing of in particular viscous or pasty materials - Google Patents

Abstract

A device for mixing viscous or pasty materials comprises a mixing vessel (1) sealed with a base part (3) and a lid part (5) lying opposite. The mixing vessel axis (10) is arranged horizontally and interacts with a linear guide (7) through the lid part. A mixing tool (9) is linearly moved by the linear guide and the base part is slidable with the lid part to drive off the mixture in the mixing vessel. Preferred Features: The base part moves horizontally to drive off the mixture. The linear guide gripping the lid part has a rinsed sealing unit which has a sealing packing support for receiving the sealing packing.

Description

Technical field

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

Under a device for large-scale mixing and a large-scale Expelling materials is understood to be a device which is used in the Usually not in a laboratory that processes a maximum of a few kilograms be used. Under industrial scale, material quantities or - understood weights that are higher than those of a normal laboratory; so start with a few tens of liters or kilograms and into tons or hectoliters go.

State of the art

EP 0 196 291 describes a mixing and squeezing device for mixing viscous or pasty masses described, which is a large-scale application could find. In the known mixing device was in a mixing vessel rotatably mounted mixer shaft arranged with a mixing tool, which also was axially movable. The vertically arranged mixer shaft penetrated one centrally Press plate, which is also axially movable on this shaft to expel the mix was. The press plate was opposite the mixer shaft as well as the Provide circular cylindrical inner wall of the mixing vessel with seals. An outlet for the mix to be pressed out with the press plate was in the bottom of the mixing vessel arranged.

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

WO 93/23156 describes a device for mixing viscous or pasty materials described. With the device, small amounts of ointments, Pastes, creams, gels and emulsions can be mixed. The mixing vessel was unheatable and had a screw cap with a single central opening through which gripped a shaft with a paddle. The shaft was rotatable in the central opening and held displaceably in the direction of the vertical longitudinal axis of the vessel. The wave could be removed from the central opening after unscrewing the screw cap and a so-called applicator is inserted into the opening. The bottom of the vessel was able to push the blended material out through the applicator be designed to be displaceable in the longitudinal axis direction of the vessel.

EP-A 1 020 167 describes a device for mixing small amounts of viscous or pasty materials [bone cement] described. The mix was subject to vacuum. The mixing bowl was vertical. Was mixed by manually moving a slide up and down with a mixing element. To the The soil could be expelled in an upward movement against the Lid are moved. The air in the mixing vessel could through openings in the Lid part can be drained; the vacuum was also applied via the Cover part.

DE-A 197 35 539 describes an unheatable one to be used for laboratory operation Stirring vessel as a device for mixing small amounts of viscous or pasty materials known. It should be here while avoiding air for mixed ointments, mixtures, suspensions or emulsions for medical or cosmetic applications. The mixing vessel was vertical and had a bottom and a lid part, the shaft of the stirrer could be guided centrally through the base or cover part. The wave was hollow educated; the mix was expelled through the inner bore, in which the Bottom when the piston was pressed into the vessel. Material could pass through an opening in the bottom, in the jacket or in the lid into the vertical mixing vessel.

EP-A 0 796 653 describes a further mixing device for the production of small ones Amounts of bone cement described for direct treatment use. The The device had a mixing tool which reached through the part of the vessel lid. Here too was, as in DE 197 35 539, EP 1 020 167 and WO93 / 23156, the floor piston-like design for expelling the mix. One could over the lid Vacuum pump can be connected.

Presentation of the invention Object of the invention

The object of the invention is a device for industrial mixing of particularly viscous and pasty materials in a mixing vessel and for the large-scale expulsion of the mixed material produced from this vessel to create, 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 the mix is arranged in one and the same mixing vessel, but clearly from each other 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.

As a mix, e.g. Sealant, PVC plastisols, reactive adhesives the basis of PUR, epoxies and acrylates, structural adhesives, emulsion paints and lacquers in question.

The device according to the invention is used for industrial mixing of particularly viscous and pasty materials in a mixing vessel as well for the large-scale expulsion of the mixed material produced from this vessel. in the In contrast to the known devices of EP-A 0 196 291, which are recognized above, the WO 93/23156, EP-A 1 020 167, DE-A 197 35 539 and EP 0 796 653 the mixing vessel axis and with it the "mixing shaft" no longer vertically, but approximately horizontal. An approximately horizontal position is in contrast to a vertical one Location thought. Nearly horizontal is also understood to mean locations which from the horizontal e.g. deviate by up to 30 °. Everything, however, an angle larger than 45 ° from the horizontal is no longer considered approximately horizontal here.

A vertical position may be copied from well-known mixing vessels have been. However, the horizontal position is foreign to the person skilled in the art, but results great ease of service for large-scale mixing devices and systems, since the components, as shown for example in Figure 3 of the application, on can be moved apart on a horizontal plane. Big lifting cranes are therefore usually no longer required for service work.

The horizontal construction also enables a rational process in the Manufacture of medium to high viscosity, also reactive products. With a minimal Energy consumption, in a closed system and a gentle process, creates a homogeneous mixture. Only a solid floor is sufficient as a stand for the device.

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 in contact with the ambient air, if there is any curing, a cover is available. 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 realm of Cover also an inlet for preferably a neutral gas to the present 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 by at least one other arranged eccentrically to the axially acting shaft Wave reachable. It is preferable not only to become an eccentric extra Wave, but two opposing waves or three or more in the same Arrange the angular distance.

So as little as possible, i.e. 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 Dichteinheit, wie sie zum Abdichten einer in das Mischgefäß eingeführten Welle mit einem Mischwerkzeug, verwendet wird,

Fig. 7

ein Prinzipschema der erfindungsgemäßen Vorrichtung mit beispielsweisen Anschlüssen und

Fig. 8

eine zu Figur 2 analoge Draufsicht mit geschnittenem Mischgefäß, wobei hier der Bodenteil zum Auspressen des Mischguts horizontal unter Bildung eines mit einem Neutralgas beaufschlagbaren Innenraumteil teilweise eingeschoben ist.

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

3 shows a cross section through a sealing unit, as used for sealing a shaft introduced into the mixing vessel with a mixing tool,

Fig. 7

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

Fig. 8

a plan view analogous to Figure 2 with a cut mixing vessel, wherein here the bottom part for pressing out the mixed material is partially inserted horizontally to form an interior part to which a neutral gas can be applied.

Ways of Carrying Out the Invention

The large-scale technical device for mixing particularly viscous or pasty materials or mixed material shown in FIGS. 1 and 2 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 of circular cylindrical design and has, for example, a volume between 500 and 2,200 liters. The shaft 7 is guided through a sealing shaft seal 13 as a sealing unit 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 . Dispersing and fine mixing is completed within two to six minutes for all products.

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 sealing unit 31 analogous to the shaft seal 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. With an extrusion pressure of up to 12 bar, for example, rapid emptying is achieved without the use of pump systems. As a result, a small residual amount is achieved. 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. As is shown in FIG. 8 , this freed interior space 39 can be filled (flooded) with a neutral gas as a gas supply via a connection 69 indicated in FIG. 7 , so that the mixed material adhering to the inner wall 11 cannot be cured by 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 cover part 5 shown in FIG. 5 has in its center a passage 41 for the shaft 7 to be located in the geometric axis 10 of the mixing vessel. To the left and right of the passage 41 are a flange 21a and 21b for the guide shafts 20a and 20b arranged. Above the passage 41 there is a connection 43 for pressurizing or vacuuming the mixing space (interior 12 ). During the mixing process and / or to eliminate unwanted gases, for example, vacuum down to -1.0 bar can be achieved. On the other hand, the mixing pressure can also be adapted to the product: atmospheric pressure, vacuum and a pressing pressure of up to 8 bar, for example.

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 shaft seal 13 has the seal packs 13a and 13b and 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 band 63b , three at a distance which corresponds to approximately half the pack length further bearing belts 63a to 63c follow. A flushing groove 65 is present between the sealing packs 13a and 13b . 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.

Since the seal packings 13a and 13b wear out more quickly than the bearing belts 63a to 63c , the seal packings 13a and 13b are arranged in an exchangeable seal pack carrier 70 of the shaft seal 13 . The seal packing carrier 70 , as can be seen in FIG. 6 , has an outer contour with two disk-shaped straight circular cylindrical outer contours 76a and 76b which are inserted in a corresponding inner contour of the base part 78 of the shaft seal 13 . The two outer contours 76a and 76b are connected via a wall 82 running perpendicular to the geometric axis 10 . In this wall, two sealing rings 84a and 84b are arranged in corresponding grooves for sealing.

Instead of a circular cylindrical outer contour of the carrier 70 , other contours can of course also be used; also those that prevent twisting due to their outer contour.

The carrier 70 can now be fixed to the base part 78 of the shaft seal 13 by screws (not shown); however, it can also be designed to be screwable together by means of a thread (not shown) on the outer contour 76a or 76b and the corresponding inner wall of the base part 78 .

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 process temperature can be controlled in a wide range without any problems. For example, products with a maximum admissible mixing temperature of 30 ° C can be manufactured perfectly.

The rinsing liquid for the shaft seal 13 is provided with the system 73 and fed to the shaft seal 13 via the flexible lines 74a and 74b . An analog system 75 is provided for the rinsing fluid of the sealing unit 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.

Thanks to a closed system, the device is for a batch-in batch Production system ideally suited. If a product change is necessary, the Downtime due to the high degree of self-cleaning and simple residual cleaning low.

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.

In summary, the device described above with its design variants a wide range of applications, an ultra-short mixing time, a safe one Temperature control, high mixing efficiency under pressure, fast Emptying without additional units and efficiency thanks to a high degree of self-cleaning and low residual cleaning effort.

Claims (9)

Device for the large-scale mixing of, in particular, viscous or pasty materials in a mixing vessel (1) and for the large-scale expulsion of the mixed material produced from this vessel (1), the mixing vessel (1) having a base part (3) and a cover part (5 ) is closed and in the mixing vessel (1) there is a movable moving tool (9) , characterized in that the mixing vessel axis (10) is arranged approximately horizontally, a linear guide (7) engages through the cover part (5) of the mixing vessel (1) , with which the mixing tool (9) can be moved in a variable position, and the bottom part (3) for displacing the mixture in the mixing vessel (1) is designed to be displaceable against the cover part (5) . Device according to claim 1, characterized in that the base part (3) is designed to be movable approximately horizontally for expelling the mixture. Device according to claim 1 or 2, characterized by preferably having valves closable inlets (45, 47, 49, 51) in the cover part (5) through which materials for the mixed products are introduced, in particular by a terminal (43) for 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 the interior of the vessel (39) that is released so that no mixing material adhering to the inner wall (11) can react due to ambient conditions. 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, the bottom part (3) is preferably secured against rotation and in particular against tilting and in particular is designed to be displaceable by an axially acting shaft (33) and in particular the rotation and in particular the tilting protection of the base part (3) 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) has a rinsed sealing unit (13) which preferably has a seal packing carrier (70) which is interchangeably arranged in the cover part (5 ) for receiving the Has sealing packs (13a, 13b) . Device according to one of claims 1 to 7, characterized in that the bottom part (3) has a rinsed sealing unit (31) Device according to one of claims 1 to 8, 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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