EP1850970A1

EP1850970A1 - Device and method for mixing a binding component and a curing component to produce a ready-made filler

Info

Publication number: EP1850970A1
Application number: EP06707251A
Authority: EP
Inventors: Klaus-W. Voss
Original assignee: Vosschemie GmbH
Current assignee: Vosschemie GmbH
Priority date: 2005-02-25
Filing date: 2006-02-24
Publication date: 2007-11-07
Anticipated expiration: 2026-02-24
Also published as: EP1850970B1; WO2006089769A1

Abstract

The invention relates to a device for mixing a binding component (A) and a curing component (B) to obtain a pasty or liquid mixed product, in particular for producing a ready-made filler for filling the surface of vehicle bodywork. Said device comprises reservoirs (3a, 3b), which are filled with the components (A and B) and store the latter (A, B) separately. The reservoirs (3a, 3b) are connected to at least one mixing chamber via separate supply channels (13a, 13b). Said mixing chamber comprises at least one discharge opening (21) for the mixed product. The device is equipped with a metering unit for transporting the components (A, B) from the reservoirs (3a, 3b) through the mixing chamber to the discharge opening (21). The curing component (B) is held in at least one reservoir (3b) that is connected to the mixing chamber via separate supply channels (13b), the binding component (A) and the curing component (B) being supplied to the mixing chamber by means of control devices in such a way that the curing component (B) is fed to the mixing chamber slightly ahead of the binding component (A).

Description

Apparatus and method for mixing a binder and a binder

Hardener component for producing a ready-to-use filler

field of use

The invention relates to a device and a method for mixing a binder component and a hardener component to a ready-to-use filler according to the preamble of claim 1.

Such a device for producing a ready-to-use filling compound for the filling of surfaces of vehicle bodies is known from DE 203 07 518 U1. The apparatus has two reservoirs arranged at a base station, one of which is filled with a binder component, namely a putty component, and with another with a hardener component. With the aid of a metering device, the two components are each fed via a feed channel continuously to a mixing chamber in which the components come into contact with each other. The mixing chamber is formed in a hose section of a flexible hose, on the outside of which press rollers engage, which compress the hose section and at the same time drive it around its longitudinal axis. Due to the friction occurring and the adhesion of the components to the inner wall of the tube, the components are mixed together. After the mixture has passed through the tube section, it arrives at an outlet opening provided on the tube, where it emerges continuously from the tube. The hose wall is made of an airtight plastic, so that the air surrounding the hose during the mixing process does not get into the mix and in this in the form of pores or Cavities can be included. In practice, however, it has been shown that the filler compound mixed with the device occasionally still has inhomogeneities. When the putty is filled on the surface of a vehicle body, the putty does not harden at the places where no hardening component is present. The elimination of such defects is associated with a relatively large effort, since the filler must be removed by grinding of the body and then the body has to be filled again. If such imperfections go unnoticed in a repair and the body is then painted, it is even necessary to repaint the site. If such an error occurs only once by a user, the result may be that the user classifies the device as unreliable and then discontinues use.

Task, solution, advantage

It is therefore an object to provide a device of the type mentioned above, which makes it possible to mix all components together so that the mix cures reliably and completely and a filler is obtained without air pockets.

This object is achieved with a device having the features specified in claim 1 and with a method having the method steps indicated in claim 25.

Thereafter, the invention in a generic device is that the device for the hardener component at least one reservoir, which is connected via at least one preferably via at least one or two separate feed channels to the mixing chamber, wherein the supply of the binder component and the Hardener component by means of control means to the mixing chamber is carried out such that the hardener component is supplied with a small flow relative to the binder component of the mixing chamber.

The inventive method is that the binder component and the curing agent component is supplied with the interposition of a metering device or a metering device excluding a mixing chamber, which is fed to the hardener component with respect to the binder component with a flow.

The invention is based on the finding that inhomogeneities in the mix are generally caused by air inclusions in the hardener component, which can not be safely avoided even with careful production of the hardener component in practice. Since the hardener component has a proportion of less than 5% and preferably only about 2% of the total volume of the mixed material, even the smallest possible air inclusions in the hardener component can result in places in the mix which no hardener Contain component and thus do not harden. Since in the device according to the invention preferably two reservoirs are provided for the hardener component and are connected via separate feed channels with the mixing chamber, in the case that in one of the feed channels should be contained once an air bubble, the mixing chamber normally via the at least one other feed channel continue to be fed hardener component. The risk that air bubbles in the hardener component should be present in all feed channels at the same time is very low and can be neglected. The device can be used in particular for the binder systems listed below:

Polyester resins (unsaturated), peroxide-styrene systems, Epoxy resins (two-component), Polyurethane resin systems (two-component) Phenolic resin systems, Silicone systems (two-component) Acrylic systems (two-component) Thiocoll systems (Polydisulfide systems).

The device may also work with at least one reservoir for the hardener component. If only one storage container for the hardener component is used, then the hardener component can be supplied to the mixing chamber via a supply channel. However, it is also possible to supply the hardener component via at least two supply channels of the mixing chamber. If more than one reservoir for the hardener component used, then each reservoir is connected via a supply channel with the mixing chamber.

A particular advantage is further that the hardener component is supplied with a flow relative to the binder component of the mixing chamber. It has been shown that with simultaneous feeding of the binder component and the hardener component, the binder component passes into the mixing chamber before the hardener component is in the mixing chamber. This uneven component feed to the mixing chamber is based on the fact that, compared to the amount of hardener component used, a larger amount of binder component is needed for the preparation of the filler compound, and therefore, when the device is put into operation, the first part of the binder component reaching the mixing chamber does not yet have any Hardener component finds so that the mixing chamber leaving filler, ie the mix, has parts to which no hardener component is added. This disadvantage is avoided in that by means of an appropriate control of the hydraulic or electric motor operated sliding floors for pushing out the components from their storage containers, the hardener component is supplied with a low flow of the mixing chamber. This flow of the hardener component with respect to the binder component can also be achieved with additional means, namely by a pre-injection of the hardener component to the binder component by means of a hydraulic, compressed air or electric motor operated piston, before the supply of the binder component in the mixing chamber presses a part of the supplied hardener component into the mixing chamber, so that the supplied binder component already encounters hardening component present in the mixing chamber.

With the inventive flow of the hardener component to the binder component, the following advantage is achieved: If the hardener component would enter the mixing chamber simultaneously with the binder component, excellent mixing results would be obtained. However, since the hardener component in the amount is only involved with 2% of the total mass, it can not be avoided that the hardener component only at a later time, for. B. one second later, enters the mixing chamber as the binder component with a share of 98% of the total mass. In this one second, however, a proportion of about 10 grams of binder component has already reached the mixing chamber, which does not yet contain a hardener component. This proportion of binder component now pushes through the mixing chamber and exits from the outlet opening and can not harden due to lack of hardener component. When something is applied to the body of a vehicle from this mass, the painter will not notice it until the applied mass is ground. The solution to this problem is inventively in such a way that before the large amount of binder component enters the mixing chamber, there is already a lot of hardener component in the mixing chamber, so that from the beginning mixing with the hardener component takes place. For this purpose, an embodiment of the invention provides that with the aid of a small piston driven by compressed air, a small amount, for. B. of about 0.2 grams of hardener component is injected into the mixing chamber before the large amount of 98% of the binder component enters the mixing chamber. In this way, it is ensured that all the binder component fed to the mixing chamber is mixed with the hardener component and thus also contains the resulting filler compound hardener component, at least in an amount of 1%, which is required for a useful hardening.

This pre-injection or supply of a small amount of hardener component is particularly advantageous. Even if the hardener component is colored, the amount of dye due to the only 2% addition of hardener component is so low that a ready-mixed filler can not be considered whether it contains hardener component or not. By means of the pre-injection, it is ensured that curable putties are obtained in all parts.

Advantageous embodiments of the invention are the subject of the dependent claims.

In a preferred embodiment of the invention, the metering device is designed such that in bladder-free mixing of the components, the mixing ratio V _B : V _S from the mixing chamber supplied volume flow VB of the hardener component and the sum V _s from the flow VB and fed to the mixing chamber Volume flow V _{A of} the binder component in the range of 1% and 4%, in particular between 1, 5% and 3% and preferably about 2%. The device is thus designed so that the mixing ratio in polyester putty and bubble-free mixing of the components a short pot life and a low Consumption of the hardener component results. Should an air bubble be contained in one of the supply channels for the hardener component, the mixing ratio is reduced compared to the mixing ratio with bubble-free mixing, which correspondingly prolongs the time required for the mixture to harden. Nevertheless, the mix hardens completely in this case.

It is advantageous if a thixotropic binder component is arranged in the reservoir for the binder component, and if the device has a device upstream of the mixing chamber for increasing the fluidity of the binder component. Upon delivery of the binder component to the mixing chamber, the thixotropy of the binder component is then temporarily reversibly disrupted, thereby better dispersing the hardener component in the binder component, particularly if there is once an air bubble in one of the hardener component feed channels should be arranged and thus the mixing chamber only a correspondingly reduced amount of hardener component can be supplied. In a polyester putty, the distance between the hardener component and the binder component in the mix must be significantly less than 0.5 millimeters, so that a uniform hardening of the mix is achieved and no areas remain in the mix in which no curing takes place. The device for increasing the flowability is reduced, especially at low temperatures, which are often below 12 ° C in a repair shop in winter, the required for the supply of the binder component to the mixing chamber delivery pressure.

In an expedient embodiment of the invention, the device for increasing the flowability has at least one element arranged in the feed channel for the binder component, which element can be driven in such a way that kinetic energy is introduced into the binder component. By introducing the kinetic energy is the Thixotropy of the binder component reversibly attenuated or even completely eliminated.

It is particularly advantageous if the storage containers are arranged at a base station, if the mixing chamber is formed in a detachably connectable to the base station mixing head, and if the feed channels guided in such a way and the mixing head is configured such that after the completion of the mixing process and the separation of Mixing head of the base station all Mischgutreste remain in the mixing head. The mixing head is formed as a disposable part, which is separated after completion of the mixing process of the base station and disposed of together with the remaining mixed material residue. Since the components only come into contact with each other in the mixing head, no hardened mixed-product residues remain at the base station. The base station can therefore be equipped after completion of a mixing process in a simple way with a new mixing head and is then immediately ready for another mixing process. When the device at the base station has means for flowability of the binder component, the cross-section of a supply channel connecting the reservoir for the binder component to the mixing head may be minimized, at least at the interface between the base station and the mixing head, such that the Binder component during removal of the mixing head of the base station at the transition point breaks without dripping. By the kinetic energy in the binder component introducing element is also displaced when pulling off the mixing head of the tear point of the binder component to the kinetic energy introducing element, so that the pulling of the mixing head at the base station forming sausage lobes kept short and inserting the new mixing head is facilitated. Conveniently, the feed channel for the binder component has an inner and outer boundary wall spaced apart by an annular gap and movable relative to one another in the circumferential direction of the annular gap, at least one of said boundary walls having a projection as a momentum introducing element. The device thereby enables a simple and inexpensive construction. The boundary wall having the projection is preferably movable and drivable relative to the reservoir for the binder component.

It is advantageous if at least the outer boundary wall consists of a transparent material, and if the hardener component is preferably different in color from the binder component. The mixing process can then be optically controlled by the outer boundary wall on the basis of the color of the mix.

The elements for introducing kinetic energy can be arranged in a plurality of floors spaced apart from one another in the direction of the axis of rotation of the rotary movement by intermediate spaces. It is even possible that the extension planes of at least two floors are tilted with elements for introducing kinetic energy relative to each other. This allows even better pre-fluidization of the binder component.

In a preferred embodiment of the invention, the metering device is designed such that in bubble-free hardener component of the mixing chamber supplied amount of hardener component is approximately equal to the individual Vorratsbehältem for the hardener component. As a result, when an air bubble occurs in one of the feed channels, regardless of which feed channel the air bubble is in, the same amount of hardener component always reaches the mixing chamber. Advantageously, the storage container for the binder component is preferably arranged approximately centrally between the storage containers for the hardener component. The base station can then have a symmetrical structure.

Preferably, the storage containers are each designed as cartridges with a sliding in a hollow cylindrical housing portion sliding floor, wherein a receptacle is provided with an abutment point for the hollow cylindrical housing portion at the base station for each cartridge, and wherein in each case relative to the abutment point a plunger is adjustably mounted, with which the sliding floor of the cartridge in question can be pressurized for pressing out the component located therein. When the components in the reservoirs are exhausted, the base station can be easily refilled by replacing the cartridges.

It is advantageous if the plungers are preferably connected to one another at their end regions remote from the sliding surfaces by a bridge, and when the bridge is movable relative to the abutment points by means of an actuator. The components can thereby be supplied to the mixing head in a simple manner in a volume flow ratio predetermined by the ratio of the base areas of the sliding bases of the cartridges. Thus, a correct dosage of the components is always guaranteed.

The actuator may have a drive shaft which is connected for displacing the bridge via a threaded spindle arranged on a spindle nut with the bridge. It is with the help of the threaded spindle, the rotational movement of the drive shaft in one for the Adjusting the cartridge sliding shelves required displacement movement implemented.

In an advantageous embodiment of the invention, the actuator has an electric motor, wherein a battery is preferably provided for the power supply of the electric motor. The device can then be driven by a motor without an external power supply. The electric drive formed from the electric motor and the battery can be a commercial drive for a cordless drill.

In another advantageous embodiment of the invention, the actuator on a pneumatic or hydraulic cylinder and / or a pneumatic or hydraulic motor. The device is then suitable for use in potentially explosive areas.

The drive shaft can also be in drive connection with a handwheel. The metering device can then be driven manually without external power supply.

It is advantageous if the drive shaft is in drive connection with at least one mixing element arranged in the mixing chamber. A drive device connected to the drive shaft can then drive both the metering device and the mixing element. The speed at which the sliding surfaces are moved, proportional to the speed of the mixing element, so that a good mixing of the components is always achieved largely independent of the speed of the drive shaft. In addition, the device allows a simple and inexpensive construction.

In a preferred embodiment of the invention, the mixing chamber is formed like an annular gap between an inner and an outer chamber wall, wherein the chamber walls about a rotation axis relative are rotatably mounted to each other, wherein the mixing elements are arranged on the mutually facing sides of the chamber walls teeth, adjacent to the tooth spaces in the circumferential direction of the mixing chamber, and wherein the teeth in the rotational movement in the direction of the axis of rotation relative to each other pass each other, that the components through Division are mixed together. The cooperating teeth of the outer and inner chamber walls allow intensive mixing of the components. In this case, shear forces are introduced into the components or the mix by the teeth, which cause the located in the tooth gaps portions of the components or the mixed material separated from in the direction of the axis of rotation adjacent portions and offset or moved in the direction of rotation. At the same time new component material is supplied via the feed channels continuously to the mixing chamber, whereby in this a flow is formed which extends from the feed channels to the outlet opening. In this way, constantly new component and / or mixed material comes into the sphere of action of the teeth. In contrast to a hose mixer, the chamber walls of the mixing chamber are preferably designed so rigid that they essentially retain their shape during the Scherkraftbeaufschlagung of the components to be mixed or the mixed material.

In a preferred embodiment of the invention it is provided that the inner chamber wall and the outer chamber wall are mounted rotatably relative to each other with axial play, that the teeth of the inner chamber wall are offset relative to the teeth of the outer chamber wall in the axial direction, facing each other, in the axial direction facing end surfaces of at least one tooth of the inner chamber wall and at least one tooth of the outer chamber wall by a between the inner chamber wall and the outer Chamber wall in the axial direction acting force can be positioned against each other, and that these end faces are inclined with respect to a plane normal to the axis of rotation at an angle such that the end faces during the mixing process slide on each other, without that the material is removed from the teeth into the mix. This makes it possible to keep the length of the mixing head in the direction of the axis of rotation short, so that after use of the mixing head only a correspondingly small residual amount of the mixture remains in the mixing head. The device thereby enables low consumption of the components. During the mixing process, the teeth of the inner chamber wall and the teeth of the outer chamber wall are pressed against each other by the delivery pressure of the components, wherein the obliquely extending face side surfaces slide on each other without abrading material from the teeth and gets into the mix. In this case, the components and / or the mix between the successive sliding end faces form a thin film which acts as a sliding layer. The angle at which the teeth are inclined relative to the plane arranged normal to the axis of rotation may be at least 5 °, optionally at least 10 ° and preferably at least 15 °. It should also be mentioned that a mixing head with such beveled teeth can also be provided in a device which has only a single storage container for each component. Such a device is described in German patent application 10 2004 044 625.3.

In addition to the first electric motor, the device may have a second electric motor which is in drive connection with the at least one mixing element, the electric motors preferably being connected to a control device which is designed such that the first electric motor is switched on or delayed after switching on the second electric motor is switched on. It is even possible that the device has a contactor, via which the second electric motor is automatically switched on when positioning the mixing head to the base station.

For centering the in the container bottom of each reservoir for the binder component and the hardener component formed Austriffsöffnungen for the supply of the container contents to the inlet openings of the feed channels in the container bottom plate a ring-shaped or partially annular, outwardly directed bead formed in the corresponding engage groove-shaped depressions in the carrier plate-like abutment point for the Vorratsbehäiter, wherein the beads and the corresponding with them groove-shaped recesses are formed to each other such that each reservoir rests flat on the abutment point.

A further embodiment of an embodiment for the centering of the storage container provides that each storage container for the binder component and the hardener component for centering the outlet opening formed in the container bottom for the container contents to the inlet openings of the feed channels with its bottom peripheral peripheral bead in one with this corresponding and formed in the support plate-like abutment point annular groove is engageable, wherein the peripheral edge bead of the reservoir are formed with the annular groove in the abutment point to each other such that the reservoir rests flat on the abutment point.

Brief description of the drawing

Embodiments of the invention are explained in more detail with reference to the drawing. Show it: Fig. 1 partly in view, partly in a vertical section a

Base station of the device for mixing a binder component with a hardener component,

2 is a side view of the device of FIG. 1, partly in a vertical section,

2A is a schematic representation of the feeding of the binder component and the hardener component into the mixing chamber of the device,

3 is a plan view of a stator of a mixing head,

Fig. 4 is a side view of the mixing head, wherein the stator in the

Section is shown

5 shows a cross section through the mixing head,

6 is a longitudinal section through the stator,

7 is a side view of a rotor part of the mixing head,

8 is a partial cross section through a mixing head along an annular peripheral mixing zone, wherein the teeth of the stator part hatched and the teeth of the rotor part are shown unshaded,

9 shows a side view of the mixing device, wherein a mixing head connected to a battery-operated electric drive is arranged at the base station in the preassembly position,

10 is a view similar to FIG. 9, but wherein the mixing head and the electric drive are arranged in the use position,

Fig. 11 partly in view, partly in a vertical enlarged

Section a arranged on the support plate-like abutment point and centered on this reservoir,

12 partially in elevation, partly in a vertical, enlarged section of a further embodiment of an abutment point arranged on the carrier plate-like abutment point and centered on this reservoir, 13 is a perspective view of a device for

Mixing a binder component with a hardener component with means for pre-injection of a small amount of hardener component into the mixing chamber,

14 is a side view of the device of FIG. 13,

Fig. 15 partly in view, partly in a vertical section of a base station of the device for mixing a binder component with a hardener component with a device for pre-injection of a small amount of hardener component in the supply channel for the hardener component to mixing chamber,

Fig. 16 partly in view, partly in a vertical section of a

Section of the device for mixing with the supply channels for the hardener component to the mixing chamber and with a, connected to one of the two Zuführkanäfe means for pre-injection of a small amount of hardener component in the mixing chamber with retracted piston,

17 shows the device according to FIG. 16 with the device for pre-injection of the hardener component with retracted piston for introducing a small amount of hardener component into the mixing chamber, wherein hardener component is present in the feed channel, FIG.

18 shows the device with the device for pre-injection of the hardener component with retracted piston to release the inflow of the hardener component to the mixing chamber, and

19 is a side view, partly in longitudinal section, of a mixing device having a pivotally mounted receiving element for the mix, which is shown in three different pivoting positions. Detailed description of the invention and best way to carry out the invention

A designated as a whole with 1 device for mixing a binder component A and a hardener component B to a ready-made filler for the filling of surfaces of vehicle bodies, has a base station 2, at the one with the binder component A ₁ such. As polyester filler, filled first reservoir 3a and two with the hardener component B ₁ such. B. a peroxide filled second reservoir 3b are arranged. It can clearly be seen that the two storage containers 3b for the hardener component B each have a significantly smaller cross section than the storage container 3a for the binder component. The sum of the cross-sectional areas of the two storage containers 3b for the hardener component B is preferably about 2% of the sum of the total cross-sectional area of the three storage containers 3a, 3b. The two reservoirs 3b for the hardener component are identical.

As can be seen in FIG. 1, the storage containers 3a, 3b are each designed as cartridges with a sliding floor 5a, 5b which is displaceable in a hollow-cylindrical housing section 4a, 4b. The sliding shelves 5a, 5b lie with their outer edge in each case tight against the inner wall of their associated housing section 4a, 4b of the respective cartridge.

At the base station 2, a metering device is arranged, which has for each cartridge in each case a receptacle with an abutment point 6a, 6b for the hollow cylindrical housing portion 4a, 4b of the cartridge. At this abutment point 6a, 6b of the housing portion 4a, 4b is in each case when the cartridge is inserted into the receptacle. For each sliding floor 5a, 5b, the metering device has in each case a plunger 7a, 7b which, in the position of use, engages the rear side of the sliding floor 5a, 5b facing away from the cartridge A, B and with the aid of a sliding guide 8a, 8b (FIGS Fig. 2) on the abutment point 6a, 6b and is moved away from this. In Fig. 1 it can be seen that the plunger 7a, 7b are arranged with their longitudinal axes approximately parallel to each other and that provided for pressing out of the binder component A plunger 7a between the two plunger 7b for the hardener component B is arranged.

At their end regions remote from the sliding surfaces 5a, 5b, the plungers 7a, 7b are fixedly connected to each other by a bridge 9 which extends transversely to the plungers 7a, 7b. The bridge 9 is rotatably connected to a spindle nut 10 which is bolted to a threaded spindle 11. The threaded spindle 11 is for pressurizing the sliding floors 5a, 5b with the shaft of a first electric motor 12 in drive connection, which is arranged on the base station 2 on the cartridge side facing away from the bridge 9 approximately in a straight extension of the plunger 7a for the binder component A. , Between the shaft and the threaded spindle 11, a transmission gear can be arranged.

In Fig. 1 it can be seen that the plunger 7a is formed for the binder component A as a sleeve, and that the threaded spindle 11 engages in the inner cavity of the sleeve. At its end facing the sliding bottom 5a, the plunger 7a has a plate-shaped widening, which is adapted in shape to the sliding floor 5a.

The plungers 7a, 7b are controlled by means of hydraulic or electromotive drives 50, which are combined in a control device 55 (FIG. 2A). The device 1 preferably has a reservoir 3a for the binder component A and at least one reservoir 3b for the hardener component B. With only one storage container 3b for the hardener component B, this is connected via a feed channel 13b with the mixing chamber 14 in connection. It is also possible to connect a single reservoir 3b via two separate feed channels with the mixing chamber 14. If two storage containers 3b are used for the hardener component B, the connection to the mixing chamber 14 takes place via two separate feed channels.

Preferably, the device 1 for the hardener component B at least two reservoir 3b, which are connected via separate feed channels 13b with the mixing chamber 14.

In order to achieve a flow of the hardener component B in the mixing chamber 14 relative to the binder component A, the drives 50 for the plunger 7a, 7b for the sliding floors 5a, 5b of the reservoir 3a, 3b for the binder component A and Hardener component B controlled by means of the control device 55 such that prior to the entry of the binder component A in the mixing chamber 14 already the hardener component B is introduced into the mixing chamber 14, so that the total introduced into the mixing chamber 14 amount of binder Component A is mixed with hardener component B (Figure 2A).

At their end opposite the sliding bottom 5a, 5b, the cartridges each have a removal opening for the components A, B stored in the cartridge. Each of the removal openings is in each case connected via a separate supply channel 12a, 12b to a common mixing chamber 14 which is detachable in one the base station 2 connectable mixing head 15 is arranged. Between the wall of the feed channel 12a, 12b and the cylindrical housing portion 4a, 4b the feed channel 12a, 12b respectively associated cartridge may be a seal, such. B. may be arranged an O-ring.

In FIG. 3 it can be seen that the mixing head has a stator part 16 which has a first inlet opening 17a for the binder component A and two second inlet openings 17b for the hardener component B. The first inlet opening 17a is assigned to the base station 2, a first outlet opening 18a, which is connected via a first feed channel 12a to the first reservoir 3a. The second inlet openings 17b are each assigned a second outlet opening 18b at the base station, which is connected in each case via a second feed channel 12b to a second storage container 3b assigned to the relevant inlet opening 17b. When the mixing head 15 is connected to the base station, the first outlet opening 18a of the first inlet opening 17a and the second outlet openings 18a each face a second inlet opening 17b, so that the components located in the individual cartridges can reach the mixing head 15 via separate paths , Thus, in the event that in one of the supply channels 12b for the hardener component B should be once an air bubble, hardener component B continue to be passed into the mixing chamber 14 via the other feed channel 12b.

The mixing head 15 is connected to the base station 2 by attaching the inlet openings 17a, 17b to the outlet openings 18a, 18b. The inlet openings 17a, 17b and the outlet openings 18a, 18b are designed as mating plug-in coupling parts, which are connected tightly in the connecting position.

In Fig. 4 it can be seen that in the stator 16 of the mixing head 15, a rotor member 19 is arranged rotatable about its longitudinal axis 20. Between the first inlet opening 17a for the binder component A and the Mixing chamber 14 is arranged on the rotor part 19, a means for increasing the flowability of the thixotropic binder component A, which has on the rotor part 19 a plurality of approximately radially to the longitudinal axis 20 in different directions projecting projections 22, which together with the Rotortei! 19 to rotate about the longitudinal axis 20 when the rotor member 19 is rotationally driven relative to the stator 16. Through these projections 22 kinetic energy is introduced into the binder component A to reversibly destroy their Thixtorpie. As a result, the binder component A can mix more uniformly with the hardener component B on entering the mixing chamber 14.

In Fig. 4 it can be seen that the components A, B are guided in the mixing head 15, that they only come into contact with each other inside the mixing head. This leaves after the completion of the mixing process and the separation of the mixing head 15 of the base station 2 all Mischgutreste in the mixing head 15. This is designed as a disposable part, which is disposed of after use and replaced by a corresponding new part.

Between the stator 16 and the rotor part 19, the mixing chamber 14 is formed. In Fig. 5 it can be clearly seen that the mixing chamber 14 is formed ringpaltförmig between an inner, arranged on the rotor member 19 chamber wall and an outer, provided on the stator 16 chamber wall. With the aid of the metering device, the mixture can be continuously conveyed through the mixing chamber 14 to a dispensing opening 21 arranged on the stator part 16, which is arranged downstream of the inlet openings 17a, 17b in the flow direction.

It can be seen in FIGS. 4 to 7 that the mutually facing chamber walls of the mixing chamber 14 have teeth 23, 24 as mixing elements. The inner chamber wall arranged on the rotor part 19 and the outer, provided on the stator 16 wall chamber 8 each have a plurality of spaced apart in the direction of the longitudinal axis 20 floors with teeth 23, 24. The teeth 23, 24 of the individual floors are each spaced apart in the circumferential direction of the mixing chamber 14 by tooth gaps. Between the individual levels, the chamber walls each have gaps through which the teeth 23, 24 of the respective other chamber wall which are opposite the respective gap pass through during the rotational movement. Due to the continuous supply of the components A, B to the mixing chamber 14, there is a division of the Mischgutstromes, ie a portion of Mischgutstromes flows on one side of the respective tooth 23, 24 and the other part on the other side of the tooth in question 23, 24 over. Since this division takes place in several stages corresponding to the number of floors, the mix is intensively mixed.

The rotor part 19 and the stator part 16 are rotatably supported by means of a sliding bearing 27 relative to each other. The sliding bearing 27 has on the stator 16 an outer bearing ring 28 and on the rotor part 19 an inner bearing ring 29 which are supported against each other in the radial and axial directions. The sliding bearing 27 has axial play in the direction of the longitudinal axis 20, as a result of which the teeth 24 of the rotor part 19 with their end faces 30 facing the main flow direction of the components A, B or the mixture facing the main flow direction indicated by the arrow P2 in FIG , in the main flow direction Pf2 facing end faces 31 of the teeth 23 of the stator 16 are moved when the mixing head 15 with the delivery pressure of the components A, B is acted upon.

In FIG. 8 it can be seen that the end faces 28, 29 are inclined at an angle α with respect to a plane arranged normal to the longitudinal axis 20 in such a way that they overlap one another during the mixing process can slide. In this case, between the end faces 28, 29 of each cooperating teeth 23, 24, a thin layer of the mixture is arranged, which serves as a sliding film. The mutually facing ends of the end faces 28, 29 of the rotor teeth 24 and the stator teeth 23 are thereby somewhat spaced apart in the longitudinal direction of the mixing head 15. In Fig. 8, the corresponding distance is designated by x. Due to the inclination of the end faces 28, 29 is avoided during the mixing process that is removed from the teeth 23, 24 material and device in the mix C. The Axiallände the rotor teeth 24 is only slightly shorter than the clear width of the spaces between the floors of the teeth 23 of the stator 16. The mixing head 15 thus allows a short design. It should also be mentioned that the forward direction of rotation of the rotor part 19 in FIG. 8 is marked by an arrow Pf2.

In the exemplary embodiments shown in FIGS. 9 and 10, the base station 2 is fastened to a building wall 26. In addition to the threaded spindle 11 driving the first electric motor 12, a second electric motor 25 is provided, which is in driving connection with the rotor part 19 of the mixing head. The second electric motor 25 has a positive fit on the rotor member 19 driver. To actuate the device, the mixing head 15 is first attached to the driver and then the mixing head 15 with the inlet openings 17a, 17b attached to the outlet openings 18a, 18b of the base station 2. In this case, a switching device not shown in the drawing is actuated, which connects the electric motors 12, 25 with a power supply, thereby starting the mixing process.

The device 1 for mixing a binder component A and the curing agent component B to a pasty or liquid mix, in particular for producing a ready-to-use filler for the filling of surfaces of vehicle bodies, thus has for separate storage of the components A, B reservoir 3a, 3b, which are filled with the components A and B respectively. The storage containers 3a, 3b are connected to at least one mixing chamber 14 via separate feed channels 13a, 13b. The mixing chamber 14 has at least one discharge opening 21 for the mix. For conveying the components A, B from the storage containers 3a, 3b through the mixing chamber 14 to the discharge opening 21, a metering device is provided. The hardener component B is arranged in at least two storage containers 3b, which are connected to the mixing chamber via separate feed channels 13b.

According to FIG. 11, each storage container 3a, 3b for the binder component A and for the hardener component B for centering the container opening formed in the container bottom 60 61 for the container contents to the inlet openings of the feed channels 13a, 13b, in or at its bottom plate 60th 'annular or partially annular, outwardly directed beads 65 which engage in corresponding groove-shaped recesses 75 in the support plate-like abutment point 6a, 6b for the reservoir 3a, 3b, wherein the beads 65 and the corresponding with them groove-shaped recesses 75 formed to each other are that each of the reservoir 3a, 3b rests with its container bottom 60 plan on the abutment point 6a, 6b. If the outlet opening 61 in the bottom plate 60 'of the reservoir 3a or 3b is formed as an outward bend, then the inlet opening of each feed channel 13a and 13b corresponding recesses, so that the flat support of the reservoir 30a, 30b on the abutment point 6a, 6b is secured.

12 shows a further embodiment in which each storage container 3a, 3b for the binder component A and the hardener component B for centering the container opening formed in the container bottom 60 outlet opening 61 to the inlet openings of the feed channels 13a, 13b with its bottom side circumferential bead 80 or its circumferential Outer edge in a corresponding with this and in the support plate-like abutment point 6a, 6b formed annular groove 95 is engageable, wherein the peripheral edge bead 80 of the reservoir 3a, 3b and the annular groove 95 in the abutment point 6a, 6b are formed to each other such that the reservoir 3a, 3b with its bottom plate 60 'rests flat on the abutment point.

The device 1 described above for mixing the binder component A with a hardener component B is provided with a device 90 for pre-injection of a small amount of hardener component A according to FIGS. 13 and 14. Before the binder component A is supplied to the mixing chamber 14 of the device 1, a small amount of hardener component B is fed to one of the two supply channels 13a or 13b for the hardener component B to the mixing chamber 14 or directly to the mixing chamber 14 by means of the device 90 ,

This device 90 consists of a cylindrical housing 91, in whose interior 91a a rod-shaped piston 92 of the means of a pneumatic drive in the direction of arrow X is movable (Fig. 15, 16, 17 and 18). The arrangement of the device 90 is such that the piston 92 can be retracted into the feed channel 13b. The device 90 can also be assigned to the feed channel 13a. The hardener component B is fed to the mixing chamber 14 via the two feed channels 13a, 13b.

The operation and control of the device 90 is as follows: Fig. 16 shows the initial position of the piston 92, which is retracted. In this retracted position of the piston 92, hardener component B is pressed into the feed channel 13b via the channel 13'b when the device is put into operation (FIG. 17). Even before binder component A is supplied to the mixing chamber 14, the piston 92 is moved forward. In this forward movement, the piston 92 is moved into the feed channel 13b; at the same time it presses the hardening agent in the feed channel 13b. Component A 'in direction X1 into the mixing chamber 14 (FIG. 17) and at the same time closes off the channel 13'b (FIG. 18), so that no hardener component B can flow from the reservoir 4b and hardening agent also pushed away from the piston 92. Component B can not escape into the channel 13'b. The length of the advancing movement of the piston 92 respectively determines the amount of hardener component B that is in the mixing chamber 14 before the device for supplying the binder component A is put into operation. Binder component A supplied to the mixing chamber 14 then encounters hardening component B already present in the mixing chamber. If a small amount of hardener component B is introduced into the mixing chamber by means of the piston 92 of the device 90, the piston 92 is moved out of the position shown in FIG 18 retreated to the position shown in FIG. When the retracted position is reached, the supply of the binder component A and the supply of the curing agent component B from the two storage containers that receive the hardener component B takes place. Since harder component B is still present in the feed channel 13b of each preceding mixing process, hardener component B is always available for supplying a small amount of hardener component B in the feed channel 13b in order to produce a small amount of hardener component B of the Feed mixing chamber 14 before binder component A of the mixing chamber 14 is supplied. By means of the device 90, it is possible, before the large amount of binder component A is supplied to the mixing chamber 14 that already a predetermined amount of hardener component B is in the mixing chamber 14, so that already from the beginning mixing with the Hardener component B can take place. Preferably, an amount of about 0.2 grams of hardener component B is injected into the mixing chamber.

In the embodiment shown in FIG. 19, at the base station 2 below the discharge opening 21 of the mixing head 15 is a planar Receiving element 32 for the mix C arranged, for example, a spatula. The receiving element 32 is by means of a pivot bearing 33 about an approximately horizontal, laterally spaced from the discharge opening 21 pivot axis against the restoring force of a spring 34 from a rest position into a working position of the discharge opening 21 away pivoting down. It can be clearly seen that when loading the receiving element 32 with the mix C, the distance between the discharge opening 21 and the receiving element 32 increases due to the weight of the mixing material C located on the receiving element 32. As a result, overflows in the mixture C are avoided on the receiving element 32.

In FIG. 19, it can further be seen that the stator part 16 and the rotor part 19 are mounted so as to be rotatable relative to one another about a rotation axis by means of a combined rotational and support bearing. The rotary and support bearing has a arranged on the base station 2 turntable 35 on which the rotor member 19 comes with its one end face to the plant. At its other end, the rotor part 19 is connected to a shaft which is in drive connection with the second electric motor 25.

Claims

1. Device (1) for mixing a binder component (A) and a hardener component (B) to a pasty or liquid mixture, in particular for producing a ready-to-use filler for filling surfaces of vehicle bodies, wherein the device reservoir (3a , 3b) for the separate storage of the components (A, B) and at least one mixing chamber (14) which is connected via separate feed channels (13a, 13b) to the individual storage containers (3a, 3b), wherein the mixing chamber (14) at least a delivery opening (21) for the mix, and wherein for conveying the components (A, B) from the Vorratsbehältem (3a, 3b) through the mixing chamber (14) to the discharge opening (21) a metering device is provided, characterized in that the device (1) for the hardener component (B) at least one storage container (3b), the at least one preferably via at least one or two separate Zuf wherein the supply of the binder component (A) and the hardener component (B) by means of control means to the mixing chamber (14) takes place such that the hardening component (B ) is supplied to the mixing chamber (14) with a slight advance relative to the binder component (A).

2. Apparatus according to claim 1, characterized in that the device (1) for the hardener component (B) at least two reservoir (3b), which are connected via separate feed channels (13b) with the mixing chamber (14).

3. Device according to one of claims 1 or 2, characterized in that the metering device is designed such that in bubble-free mixing of the components (A ₁ B), the mixing ratio V _B : Vs from the mixing chamber supplied volume flow VB of the hardener component ( B) and the sum Vs from the volume flow V _B and the volume flow VA of the binder component (A) fed to the mixing chamber is between 1% and 4%, in particular between 1.5% and 3%, and preferably about 2%.

4. Device according to one of claims 1 to 3, characterized in that in the reservoir (3a) for the binder component (A) a thixotropic binder component (A) is arranged, and that the device (1) of the mixing chamber (14 ) upstream device for increasing the flowability of the binder component (A).

5. Device according to one of claims 1 to 4, characterized in that the means for increasing the flowability comprises at least one in the feed channel (13 a) for the binder component (A) arranged element which is drivable in such a way that in the binder Component (A) kinetic energy is introduced.

6. Device according to one of claims 1 to 5, characterized in that the storage container (3a, 3b) are arranged on a base station (2), that the mixing chamber (14) in a releasably connected to the base station (2) mixing head (15 ) is formed, and that the feed channels (13a, 13b) guided in such a way and the mixing head (15) is designed such that after the completion of the mixing operation and the separation of the mixing head (15) from the base station (2) all Mischgutreste remain in the mixing head (15).

7. Device according to one of claims 1 to 6, characterized in that the feed channel (3a) for the binder component (A) has an inner and outer boundary wall, which are spaced apart by an annular gap and in the circumferential direction of the annular gap relative to each other in that at least one of said boundary walls has a projection (22) as a momentum introducing element.

8. Device according to one of claims 1 to 7, characterized in that at least the outer boundary wall consists of a transparent material, and that the hardener component (B) is preferably different in color from the binder component (A).

9. Device according to one of claims 1 to 8, characterized in that the elements for introducing kinetic energy in a plurality of spaced-apart in the direction of the axis of rotation of the rotary movement through spaces spaced floors are arranged.

10. Device according to one of claims 1 to 9, characterized in that the extension planes of at least two floors are tilted with elements for introducing kinetic energy relative to each other.

11. The device according to one of claims 1 to 10, characterized in that the metering device is designed such that in bubble-free hardener component (B) of the mixing chamber (14) supplied amount of hardener component (B) about equal parts of the individual storage containers (3b) for the hardener component (B).

12. Device according to one of claims 1 to 11, characterized in that the storage container (3a) for the binder component (A) is preferably arranged centrally between the storage containers (3b) for the hardener component (B).

13. Device according to one of claims 1 to 12, characterized in that the storage container (3a, 3b) are each formed as cartridges with a in a hollow cylindrical housing portion (4a, 4b) sliding sliding bottom (5a, 5b) that at the base station (2) for each cartridge a receptacle with an abutment point (6a, 6b) for the hollow cylindrical housing portion (4a, 4b) is provided, and that in each case relative to the abutment point (6a, 6b) a plunger (7a, 7b) adjustably mounted is, with which the sliding bottom (5a, 5b) of the cartridge in question for pressing out the component therein (A, B) is pressurizable.

14. Device according to one of claims 1 to 13, characterized in that the pressure stamps (7a, 7b) are preferably connected to each other at their end areas remote from the sliding floors (5a, 5b) by a bridge (9), and that the bridge ( 9) with help an actuator relative to the abutment points (6a, 6b) is movable.

15. Device according to one of claims 1 to 14, characterized in that the actuator has a drive shaft which is connected to move the bridge (9) via a on a threaded spindle (11) arranged spindle nut (10) with the bridge (9) ,

16. Device according to one of claims 1 to 15, characterized in that the actuator has an electric motor (12), and that for supplying power to the electric motor (12) is preferably provided a battery.

17. Device according to one of claims 1 to 16, characterized in that the actuator comprises a pneumatic or hydraulic cylinder and / or a pneumatic or hydraulic motor.

18. Device according to one of claims 1 to 17, characterized in that the drive shaft is in drive connection with a handwheel.

19. Device according to one of claims 1 to 18, characterized in that the drive shaft with at least one in the mixing chamber (14) arranged mixing element is in drive connection.

20. Device according to one of claims 1 to 19, characterized in that the mixing chamber (14) is formed annular gap-like between an inner and an outer chamber wall, that the chamber walls are mounted rotatably about an axis of rotation relative to each other, and that the mixing elements to the Teeth (23, 24) arranged on mutually facing sides of the chamber walls are adjacent to tooth gaps in the circumferential direction of the mixing chamber (14), and that the teeth (23, 24) pass one another in a rotational movement in the direction of the axis of rotation relative to one another the components (A, B) are mixed by division.

21. Device according to one of claims 1 to 20, characterized in that the inner chamber wall and the outer chamber wall are rotatably supported relative to each other with axial play that the teeth (24) of the inner chamber wall so relative to the teeth (23) of the outer chamber wall offset in axial direction, facing axially facing end faces (30, 31) of at least one tooth (24) of the inner chamber wall and at least one tooth (23) of the outer chamber wall by an axially acting between the inner chamber wall and the outer chamber wall Force are mutually positionable, and that these end faces (30, 31) are inclined with respect to a plane normal to the rotation axis at an angle (α) so that the end faces (30, 31) during the mixing operation slide on each other without the teeth (23, 24) material is removed into the mix (C).

22. Device according to one of claims 1 to 21, characterized in that in addition to the first electric motor (12) is provided a second, with the at least one mixing element in drive connection standing electric motor (25), and that the electric motors (12, 25) are preferably connected to a control device which is designed such that the first electric motor (12) is switched on when switching on or delayed after switching on the second electric motor (25).

23. Device according to one of claims 1 to 22, characterized in that below the discharge opening (21) a receiving element (32) for the mix (C) is arranged, which receiving element (32) against a restoring force from a rest position to a working position is movable, that it is moved during loading of the mix (C) under the influence of gravity from the discharge opening (21) away.

24. The device according to claim 23, characterized in that the receiving element (32) from the rest position in the working position is pivotally connected to the mixing head (15).

25. Device according to one of claims 1 to 24, characterized in that the metering device for mixing a predetermined amount of the mixed material (C) is controlled via a timer.

26. Device according to one of claims 1 to 25, characterized in that the inner chamber wall on a rotor part (19) and the outer chamber wall on a stator (16) are arranged, and the rotor part (19) is mounted rotatably in the stator part (16) about a rotation axis by means of a rotary bearing and is fixed in the axial direction relative to the stator part (16) by means of a support bearing

27. The device according to one of claims 1 to 26, characterized in that the support bearing has a rotatable about the rotation axis turntable (35) on which the rotor part (19) comes into use position with an end face to the plant.

28. Device according to one of claims 1 to 27, characterized in that with one of the two feed channels (13a, 13b) for the hardener component (B) means (90) for pre-injection of a small amount of hardener component ( B), which consists of a cylinder (91) with a in its interior (91 a) arranged compressed air or otherwise driven piston, wherein the piston (92) is controllable such that during the supply of a small amount of hardener component (B) closed the supply channel (13a, 13b) for the supply of additional amounts of hardener component (B) and after completion of the supply of a small amount of hardener component (B) of the introduced into the feed channel (13a, 13b) piston ( 92) is withdrawn from the feed channel (13a, 13b) and thus the further supply of hardener component (A) into the mixing chamber (14) is released.

29. Device according to one of claims 1 to 28, characterized in that each storage container (3a, 3b) for the binder component (A) and for the hardener component (B) for centering in the Container bottom (60) formed outlet opening (61) for the container contents to the inlet openings of the feed channels (13a, 13b) in or on its bottom plate (60 ') annular or partially annular, outwardly directed beads (65) which in corresponding groove-shaped recesses (75) in the carrier plate-like abutment point (6a, 6b) for the reservoir (3a, 3b) engage, wherein the beads (65) and the corresponding with them groove-shaped recesses (75) are formed to each other, that each of the reservoir (3a , 3b) with its container bottom (60) of the abutment point (6a, 6b) rests.

30. Device according to one of claims 1 to 28, characterized in that each storage container (3a, 3b) for the binder component (A) and the curing agent component (B) for centering in the container bottom (60) formed outlet opening (61 ) for the container contents to the inlet openings of the feed channels (13a, 13b) with its bottom peripheral peripheral bead (80) or peripheral edge in a corresponding with this and in the carrier plate-like abutment point (6a, 6b) formed annular groove (95) is engageable , wherein the peripheral edge bead (80) of the reservoir (3a, 3b) and the annular groove (95) in the abutment point (6a, 6b) are formed to each other such that the reservoir (3a, 3b) with its bottom plate (60 ') plan on the abutment point (6a, 6b) rests.

31. A method for mixing a binder and a hardener component using a device according to one of claims 1 to 30, characterized in that the binder component (A) and the hardener component (B) with the interposition of a metering device or below Exclusion of a metering device of a mixing chamber (14) is supplied to which the hardener component (B) relative to the binder component (A) is supplied with a flow.

32. The method according to claim 31, characterized in that for the flow of the hardener component (B) relative to the binder component (A) in the mixing chamber (14) while preventing a further inflow of hardener component (B) by means of a a small amount of hardener component (B) from the feed channel (30a; 30b) is forced into the mixing chamber, whereby after the piston (92) has been withdrawn from the feed channel (13a; 13b), the supply of curing agent Component (B) and the binder component (A) takes place.