WO2016019948A2

WO2016019948A2 - Method for producing a two-component or multi-component foam for filling cavities or moulding units/bodies with foam

Info

Publication number: WO2016019948A2
Application number: PCT/DE2015/100326
Authority: WO
Inventors: Torsten HÖLZEL; Thomas BRANDLER; André PUSCH
Original assignee: ATN Hölzel GmbH
Priority date: 2014-08-03
Filing date: 2015-08-03
Publication date: 2016-02-11
Also published as: WO2016019948A3; DE112015003583A5

Abstract

The invention relates to a method for producing a two-component or multi-component foam for filling cavities or moulding units/bodies with foam. The object of the invention is to provide a method for producing a two-component or multi-component foam for filling cavities or moulding units/bodies with foam and to provide an assembly for carrying out said method, whereby the method and assembly facilitate a low-wear operation, rapid and highly accurate dosage and can also be achieved with few resources and thus cost-effectively. The invention relates to a method for producing a two-component or multi-component foam by applying the mixed components to cavities or moulding units or bodies, each component being supplied to a mixing head (3) from an individual storage container (1). Depending on the operating mode, during operation the components are supplied to the mixing head (3) at an adjustable pressure by means of a dosing element (2), or during circulation said components circulate between at least the storage container (1), the dosing element (2) and the mixing head (3). The specific parameters and settings for the components, the dosing element (2), the mixing head (3) and the storage container (1) are detected and adapted by means of a controller. Each component is dosed by means of at least one electromechanically driven volumetric plunger dosing unit as the dosing element (2) and for the circulation of each component, the component is delivered at least to the dosing element and/or past the dosing element (2). During the circulation the dosing element (2) is set to have a fillable capacity of between 0 % and 30 %, before application the component is delivered to the dosing element (2) in order to fill the latter (2) and for the application the delivery of the component at least to the dosing element (2) is interrupted and the component is delivered to the mixing head by the emptying of the dosing element (2).

Description

Process for producing a two-component or multicomponent foam for foaming cavities or forming units / bodies Process for the preparation of a two-component or multi-component foam for filling cavities or forming units / bodies, in particular for

Vehicles or vehicle parts. There are already methods for foaming

Bicycles with bicomponent or

multi-component foams known. In these methods, dosing pumps or hydraulic dosing units are used for the application, which each have disadvantages. The high-pressure pumps used for dosing for the application are known, for example, as axial piston pumps or gear pumps. Their disadvantage is that they are subject to high wear and also can dose only very inaccurate. In addition, the wear causes the inaccuracy to increase with the progress of use. The hydraulic dispensers have the disadvantage that they can indeed work accurately, but have a very poor response. The low one

Reaction speed is again low

Cycle times disadvantageous. In conjunction with small amounts of hydraulic dosing he unsuitable.

From EP 1 702 737 AI a method for the production of moldings from reactive plastics in a device is known in which the device reservoir for the reactive components, a mixer for the mixing of the reactive components, metering units and lines for the metering of the reactive components from the storage containers in comprises the mixer and wherein at least one of the reactive components are associated with two Dosierkolbenaggregate, each having a metering piston and each one of the metering piston associated spindle unit with a spindle and a spindle nut, wherein the spindle nuts are driven by a torque motor, and in which the reactive components are metered into the mixer and mixed there to form a reactive mixture, and the reactive mixture is subsequently discharged from the mixer into a mold or on a substrate and cured there wherein the two Kolbendosieraggregate operated so that a continuous stream of reactive mixture is discharged from the mixer.

Furthermore, EP 2 461 964 A1 describes a device for the mechanical processing of polymeric reaction systems with at least two components under high pressure with only one pressure piston and optionally several

Working containers per raw material channel for compressing the respective components and a mixing head, wherein the line volume between the pressure piston and the mixing head is less than or equal to 5 cc per raw material channel. Furthermore, systems are known in which means

Diaphragm pumps and similar, so-called high pressure stations, the material promotion as well as dosage make.

The disadvantage of these solutions is that they only conditionally for larger and at the same time quickly successively

auszubringende volumes are suitable. In addition, the dosers are subject to because of the unencumbered with the dosing

Pump function a significant wear. Furthermore remain in the displacer system parts of the components in the dosing (dead space), whereby a long-term homogeneous operation and quality of the components is not guaranteed.

A disadvantage of the solution with high-pressure stations is the rather inaccurate dosage (about 10-20% result tolerance) and high inertia due to long conduction paths to the mixing head. This particularly affects the control behavior. The object of the invention is therefore to provide a method for

Preparation of a two-component or multi-component foam for foaming cavities or forming units / bodies and to provide an arrangement for carrying out the method, whereby a low-wear

Operation, fast and high-precision dosing

is made possible and also with little effort and thereby economically feasible. The problem is solved with the features of the main claim and the independent claim.

The advantage of the method is that under

Use of the electromechanically driven

Volumenkolbendosier ereinheit as dosing a highly accurate component output to the mixing head and is output from this. This high-precision metering of the components takes place via the respective existing filling quantity of the metering irrespective of the level of the metering device and the

promoting amount of each component.

Furthermore, the arrangement is a constructive

Simplification achieved, by which preferably by means of electromechanically driven volume piston dosing he, particularly preferably according to the scraper - working principle, a better and over the entire volume of the respective filling of the Volumenumvolbendosier he s more accurate and

Totraumfreie dosing for the application of the components is possible. The arrangement is also easy to maintain and has a lower risk of damage. So will the

Areas and connections, which are subjected to a required high working pressure, minimized, since the working pressure is built only in each doser and is maintained over a short connection to a mixing head and the circulation

largely depressurized. In addition, can be

Pressure-adjusting or compensatory measures, which at the respective required working pressure at long Pressure line lengths would be required, avoid. The short ways to the mixing head is in particular a

Another process advantage achieved by the heaters in the system and thus the energy consumption

be significantly improved and optimized. With it

In addition, valves are present, so that the application pressure between the Volumenkolbendosier he remains stable as a metering and mixing head or changes only in a controlled manner on the application pressure reduction in the circulation is avoided. Thus, the other, the component leading compounds of the

Circulation, in a less elaborate and so

manufacture cost-effective design. Since the pressure build-up takes place by means of or only in the metering device, further additional pressure-increasing measures are not required, as a result of which a further energy saving is achieved. The constructive components used can be in

Exchange maintenance case easily. The arrangement allows the components to be made available to the application as needed by the method and that a

possibly necessary conditioning takes place, with a stagnation of the circulation, for example by

Dead spaces are avoided. The method using the arrangement can be used for foaming cavities, preferably for introducing acoustic foams in vehicle bodies and the vehicle

Foam molds used to make seats, seats and center armrests. This can be individually and flexibly different

To implement foaming processes, which however also over the

Application on vehicle bodies. The use is also conceivable foam processes for housing or machinery.

Advantageous embodiments of the method are shown in claims 2 to 11 and the device in claims 14 to 17. To avoid precipitation, crystallization or

Sedimentation of individual components of the components, the circulation of the components is important if necessary. The promotion of the components for the circulation and filling of the dosing is done advantageously by means of a

Pump. The pump can be independent of the condition or of the

Filling level of the dosing pump the components wear. It is advantageous in between the

Reservoir and the dosing he, preferably in the

Connection between the pump and the dosing he,

preferably a metering inlet valve for the circulation and filling of the metering open and for the

Application closed. That's it

Dosing he inlet valve and the pump connected to the controller. This ensures that in the

Application of the application pressure is not over all dimensions in particular on the pump or through this acts on the reservoir. This will be the procedure

more precisely, because of the application pressure

Pressure drop across the pump is possible, causing the

Quality of the application could be compromised. In a corresponding impermeable, pressure-resistant and thus more expensive and expensive pump, which the

Application pressure would withstand that is

Metering inlet valve not mandatory. The use of this, however, allows easy use of the method. In addition, the metering inlet valve can be designed as a one-way valve or overflow valve, whereby the connection to the control is more of a monitoring. If the overflow valve is adjustable, the adjustment can preferably be realized by means of the control. Advantageously, the promotion of the components for the circulation and / or filling of the dosing by means of the dosing he s and / or the pump, wherein in the connection between the reservoir and the dosing he takes place, preferably between the pump and the dosing unit

Dosing he inlet valve for the circulation and filling of the dosing opened and closed for the application and that in the connection between the meter and the mixing head a dosing erauslassventil for filling the dosing closed and for the circulation and

Application is opened, the pump, the

Dosing he inlet valve and the dosing erauslassventil are connected to the controller. The metering inlet valve

and / or the metering erauslassventil can also be run as a one-way valve or spill valve. The connection to the controller also serves one more here

Monitoring. If the overflow valve is adjustable, the setting can preferably also be realized by means of the control.

The one-way valve or overflow valve has the advantage that when conveying by the delivery pressure, the valve lock is overcome, so that the promotion trouble-free

works. When applying the application pressure acts against the valve, which then the connection

locks functionally and thus prevents the

Application pressure in the direction of the pump or

Storage tank spreads.

The promotion of components by means of dosing represents a simple variant, which, depending on the required

Cycle times can offer benefits. This type of promotion can be used, for example, as a backup if the pump fails or is switched off on schedule. This type of promotion is rather slow, so that the cycle times are longer or are.

Here, too, it is achieved that during application of the application pressure is not beyond measure for

Dismantles the reservoir or, if available, does not affect the pump. This makes the procedure more accurate because of the application pressure, a pressure drop across the pump is possible, whereby the quality of the application could be compromised. In addition, the filling of the dosing Ers without pump, either for the circulation or the preparation of the application, improved because the components would be drawn directly from the reservoir and not back over the mixing head and the circulation connection.

Another advantage is that for the circulation in the circulation connection between the mixing head and the

Reservoir a shut-off valve is opened and for the application in the circulation connection between the mixing head and the reservoir, the shut-off valve

is closed. Here is the shut-off valve with the

Control connected. This makes it possible that the

Application pressure reliably does not affect the reservoir and the dosage druckver loss-free and thus can be done in the desired high accuracy and fine dosage to the mixing head. In addition, there is the constructive advantage that in addition to mixing heads with integrated

Circulation break can also be used mixing heads, which do not possess this interruption and enable the circulation through a simple passage. With the shut-off valve, the pressure loss, which would be given by a further functioning circulation, during the application in the direction of reservoir safely prevented t.

In one development of the method, at least during the application, the circulation of the components is maintained via a circulation bypass. As a result, a circulation of the components is ensured during the application and a stagnation of

Components or the component flow avoided.

Advantageously, in the process of the reservoir with a pressure between atmospheric pressure and 15 bar

applied. By means of a higher of the atmospheric pressure deviating pressure in the reservoir, the promotion of the components is promoted by and by the pump. By an acted upon by atmospheric pressure

Reservoir, the circulation and the

Adjust the filling by means of the pump better and adapt, since the delivery line of the pump is not affected by the pressure in the reservoir. Both versions allow optimal operation of the circulation and the filling of the dosing in each individual application.

Advantageously, as described in the method, the supply of the respective components for dosing he by the pump and / or by the dosing he himself. In addition, the supply by the pressurization of the

Reservoir s achieved or favors. This ensures that the filling of the meter with the

Components can be made even if the pump fails. Thus, the reliability of the implementation of the method and the application arrangement is increased. Small amounts of

Components can be nachfördern only through the metering both with and without pressurization of the reservoir. Are the dosing he for the respective

If components were arranged in parallel, there would only be slight delays between the respective ones

Applications, because one of the dosers is filled, while the other applied and vice versa.

Advantageously, in the method, the application by means of a robot, wherein the control of the application by means of the robot control of the robot takes place.

As a result, a simplification of the method and a cost savings is achieved because with only one controller

Interfaces between individual controls can be minimized or avoided. Thus, a simultaneous control of the robot and the application in real time is possible without varying individual characteristics

Control systems. It is both a Flow operation as a clock mode possible, bringing the

Flexibility of the use of the method is increased.

It is advantageous in the method that the respective component volume of the respective dosing he s continuously supplied to the mixing head, wherein the adjustment of the mixing ratio of the components on the controlled emptying of the respective dosing he done, which depending on the specific application, an individually adjustable and highly accurate applicable mixing ratio and its

Application, regardless of the level of the entire volume is possible. In addition, an interruption-free operation for the mixing head is possible in particular if two or more dispensers are arranged in parallel and regularly different

Mixing ratios are required.

Advantageously, in the method, the connection between the reservoir and the doser with a pressure of 0 bar to 60 bar operated, whereby an energy-saving and insensitive to pressure fluctuations operation with a simpler design structure is possible. This makes it possible to use constructive elements which do not have to have increased compressive strengths. On the one hand acts on the one hand, the pressure acting on the reservoir and on the other hand, the pressure which the pump for the

Circulation and for the filling of the dosing built. In the case of the use of the pump, it comes for example at this to a pressure increase in the section of

Connection between the pump and the doser.

Furthermore, the connection between the doser and the mixing head is advantageous, in particular for the application as a high-pressure connection with the respective

Application pressure in the range of 60 to 350 bar

operated, wherein the respective application pressure is dependent on the components used. Depending on the component used, the required application pressure is between 100 bar and 200 bar or between 200 and 350 bar. However, the application pressure may, for example, also be in a range of 120 bar to 150 bar. Of the

Design effort with regard to special pressure-resistant elements is limited to the area between meter and mixing head. In addition, only in a limited area of the arrangement, the high pressure as the application pressure

built up. Thus, only by means of the dosing ers necessary for this area to build up pressure and pressure energy is applied. Additional, the high pressure generating and maintaining measures are not necessary.

In an advantageous embodiment of the method, a pump valve is provided parallel to the pump, wherein the pump valve at least as a one-way valve and / or

Overflow valve is operated from the reservoir to the doser. This makes it possible, regardless of the pump to promote the components by means of dosing ers. This allows an emergency operation with a defective pump or energy-saving operation without a pump. At the same time it is avoided that the components do not enter the reservoir against the circulation.

In the arrangement for carrying out the method of the doser is an electromechanically driven

Volumenkolbendosier he unit, which after the

Scraper principle works. Here, the volume of the metering device, for example in the form of a cylinder, is changed by displacement of a piston within the cylinder between a maximum volume up to complete emptying, depending on the specific embodiment, a not belonging to the volume of the metering flow range can remain. It can be highly accurate dosages

reach, which allow a highly accurate mixing of the components at the mixing head. In the connection preferably between the pump and the metering device, a metering inlet valve is preferably present, which prevent a pressure reduction in the direction of the reservoir during application should, if not by other process-relevant

Elements in this connection can be reached. This

Metering inlet valve is also with a controller

connected, whereby a process-appropriate control takes place.

Advantageously, in the connection between the doser and the mixing head a dosing erauslassventil available.

Additionally or alternatively, in the connection between

Reservoir and dosing a pump arranged, which facilitates the circulation and the filling of the dosing or faster. The pump and that

Dosing erauslassventil are also with the controller

connected, so that the control can be made as needed. This is achieved depending on the particular type of delivery of the components, that the circulation and the application run in the required manner, without causing malfunction or misguidance. The dosing he as an electromechanically driven

Volume piston dosing unit enables highly accurate

Dosages. In general, it is important to avoid that

Application pressure in the direction of the reservoir s acts or that the components return to the circulation against the circulation. The additional or

additional dosing exhaust valve also allows the

Delivery of components only with the dosing he, if the pump is switched off, defective or from another

Basically unavailable or exists.

In a further development, a shut-off valve is arranged in the circulation connection between the mixing head and the reservoir. Thus, the arrangement is flexible and

regardless of different mixing heads, which interrupt the circulation when applying or not. The shut-off valve is also connected to the controller, so that the control can be carried out as needed. In an advantageous embodiment, before, on or in the dosing he inlet valve in the connection between

Reservoir and doser a branch with a

Circulation bypass to the reservoir available. Thus, a circulation possibility is created, which also circulates the circulation during the application or in the temporal region of the application

Maintains circulation. This branch is

For example, a separate three-way valve or an inlet valve with the or in the metering he combined or integrated three-way valve, so that a component-optimized design is possible.

It is advantageous in the arrangement, the control of

Application in the robot control of the robot

integrated, which simplifies the control and eliminates the need for additional component and interfaces forming a source of error. It increases the

Performance of the controller. In addition to lower costs, the costs are also minimized.

A pump valve is advantageously present in the arrangement parallel to the pump, wherein the pump valve has no or at least one connection with the controller.

This will cause one of the pump

independent, parallel way to promote the components in the doser is provided. Errors on the pump can be compensated or bridged. An overall failure of the system can thus possibly

be avoided.

Two embodiments of the invention are in the

Drawings and are described in more detail below.

Show it

Fig. 1 is a schematic representation of the arrangement for carrying out the method with pump and without Circulation bypass,

2 and 3 each show a schematic representation of the arrangement for carrying out the method with pump and with circulation bypass,

Fig. 4 is a schematic representation of the arrangement for carrying out the method without a pump and without

Circulation bypass,

Fig. 5 is a detail of a pump valve assembly and

6 and 7 is a schematic representation of a

Volume piston dosing unit.

In the method according to the invention for producing a two-component or multicomponent foam by application of the mixed components into cavities or forming units or bodies, the respective components are supplied from a respective storage container 1 to a mixing head 3. Depending on the mode of operation in the

Application will be the components under one

adjustable pressure by means of a dosing device 2 fed to the mixing head 3. In addition, there is a circulation between at least the reservoir 1, the dosing he 2 and the mixing head 3 and back to the reservoir. 1

Here, the specific parameters and settings of the components, the Dosier s 2, the mixing head 3 and the reservoir s 1 are detected and adjusted by means of a controller. In the reservoir 1, the conditioning of the components takes place. The storage container 1 is supplied or refueled in accordance with the daily requirement or for process simplification in only small quantities from a component storage 6 with the respective components.

This foam can be a polyurethane foam with the

Components be isocyanate and polyol. It is possible to use further two- or multi-component foams.

In the inventive method for production

two-component or multi-component polyurethane Foam, the dosage of the respective component by means of an electromechanically driven

Volume piston dosing unit as dosing device 2. This

Doser 2 is, as shown in Figures 6 and 7, driven by an electric motor 15. The electric motor 15 drives via a gear 16 to a threaded spindle 17, on which a threaded spindle 20 axially displaceable

seconded. This moves or drives a piston 18 directly or indirectly as a scraper 18 for a

Volume increase and volume reduction in a cylinder chamber 19 corresponding to axially. Spindle nut 20 and piston 18 are in this case, as shown in Figure 6, either connected to each other, so that any axial lifting movement of the piston 18 and the spindle nut 20 shown only by the rotational movement of the threaded spindle 7, not connected to the piston 18, wherein the spindle nut 20 is moved to empty the cylinder chamber 19 of the metering 2 against the piston 2 and presses on this and is already driven to fill in a position corresponding to the desired filling on the threaded spindle 17 and the piston 18 only by the delivery pressure of the pump. 7 or by pressurizing the

Reservoir s 1 moves and in the direction of the respective position of the spindle nut 20 for the maximum or desired filling of the cylinder chamber 19 and thus against the

Spindle nut 20 is pressed or moved. The particular design of the dosing Ers 2 depends on the particular promotion of the components. During a circulation of the components in the connection 4a between the reservoir 1 and the dosing he 2 promotion possible. In the

Circulation connection 5 between the mixing head 3 and the reservoir 1, a shut-off valve 9 is also controlled open, so that a component flow from

Reservoir 1 via the metering unit 2 to the mixing head and back to the reservoir 1 is made possible. For the Application, the promotion is interrupted insofar as that the circulation over the dosing he 2, the mixing head 3 and back to the reservoir 1 is interrupted. In the circulation connection 5 between the mixing head 3 and the storage container 1, the shut-off valve 9 is closed, so that the components are conveyed to the mixing head 3 and applied by the control of the dosing device 2. The dosing he 2 is during the circulation

between 0% to 30%, preferably filled with 10%

set. Another particular embodiment of the

Dosing he s 2 provides that the dosing he 2 even with a complete emptying, so a zero percent

Filling has a dead space eien passage, through which the circulation can continue to take place. The

Shut-off valve 9 is connected to the controller and

allows depending on the mixing head 3 the necessary

Application pressure as back pressure, without that during the

Application, the components are displaced via the circulation connection 5 to the reservoir 1.

Advantageously, the promotion of the components for the circulation by means of a pump 7, which a constant and continuous component flow during the

Circulation allows. Another mode of operation of the circulation is provided by the doser 2 the

Carrying out for the circulation itself, in which case the component flow is discontinuous, unless two or more dispensers for the same component are connected in parallel. At least in this type of circulation is also in a compound 4b between dosing he 2 and

Mixing head 3 a metering erauslassventil 11 is present, which in particular prevents the metering device 2 during filling, ie the suction of the respective component,

contrary to the direction of circulation promotes. For this dosing erauslassventil 11, the metering he inlet valve 8 is in interaction. When filling the dosing he s 2, the metering erauslassventil 11 is closed and that

Dosing he inlet valve 8 open. When emptying the Dosiers 2 for further circulation through the doser and when applying the metering erauslassventil 11 is opened and that metering he inlet valve 8 is closed.

In addition, the shut-off valve 9 is closed during application and opened when circulating. The respective setting or monitoring of the valves takes over the control. When promoting so filling the metering 2 with pump 7 can be in case of need, the respective metering erauslassventile 11 and metering he inlet valves 8 accordingly control, whereby the filling process runs faster.

In the inventive method is the

Application pressure in the mixing head in a concrete

Example for the production of polyurethane foam, for example 120-150 bar.

For the regular or continuous conditioning of the components heat exchanger 13 are provided, which are arranged at least in the circulation in front of the reservoir 1 and thus the temperature of the components before returning to the reservoir 1 to the

adjust prevailing temperature in the reservoir 1. Alternatively, it is envisaged that each of those

Components leading connecting lines are tempered (not shown) and thus acting as a heat exchanger 13 almost completely the temperature of

Allow components.

To improve the process and to ensure the required application pressure and to avoid pressure drops is, as described above, in the connection 4a between the pump 7 and the reservoir 1 and the meter 2 each a dosing he inlet valve 8 available. This dosing he inlet valve 8 is opened for the circulation and filling of the dosing he 2. For the application, however, it is closed. To ensure the correct function and the appropriate operation, the metering he inlet valve 8 as a controllable valve with the Control connected. The metering he inlet valve 8 is a further concrete embodiment of a

Non-return valve or a one-way valve, the

Component flow in the direction of circulation is possible and is reliably closed during the application. Depending on the version of this metering he inlet valve 8 is at least monitored by the controller.

In addition to controlled by the controller

Metering inlet valves 8 and metering outlet valves 11 can also be used as one-way valves or as

Run overflow valve. The control takes over the monitoring function of the proper,

intended function. Adjustable overflow valves can be adjusted by the control. Depending on

Reliability requirements is the connection to

Control only as optional.

To ensure circulation, at least when applying, a circulation bypass 12 is present.

This is in the compound 4a before the

He metered inlet valve 8 via a branch 14 for

Reservoir 1 available. The branch 14 is designed in a specific embodiment as a three-way valve or with two valves, so that it is also possible to flow through this circulation bypass 12 during the regular circulation. Thus, at least during the application, the circulation of the components via the circulation bypass 12 is maintained. This three-way valve or the arrangement of two valves for the branch 14 may also include the metering inlet valve 8, so that there is an optimizing and thereby fully functional implementation of the circulation and promotion and the retention during application.

In a concrete embodiment, the reservoir 1 is at atmospheric pressure or at a pressure between Atmospheric pressure and 15 bar applied. With a pressure of 10 bar, which is preferred in a specific exemplary embodiment, it is achieved that during the filling of the dosing device 2 by the dosing device 2 itself, on the one hand, the component flow is promoted and, on the other hand, the dosing device 2 is mechanically relieved during filling. In addition, in a further concrete embodiment, the mechanical structure of the metering device 2 can be simplified, so that when filling the

Dosierers 2, the components are not sucked but by means of the delivery pressure, the piston of the dosing he 2 move. The filling of the dosing device 2 by means of the pressurized reservoir s 1 is, depending on the requirement or system configuration, as an exemplary embodiment both for the circulation and for the preparation of the

Application provided.

In the circulation of the components and the filling of the metering device 2 by means of the pump 7, the component flow is also favored by an increased pressure in the reservoir 1, so that the pump 7 is relieved during the promotion. This is in a concrete

Embodiment of the pressure 13 bar.

It is envisaged that the supply of each

Components for dosing he 2 done by the pump 7 and the dosing he 2 filled. Yes, after the metering unit 2 has been operated, the delivery pressure causes the piston to move within the

Dosier ers 2 displaced while filling the cylinder. It is envisaged that the filling of the dosing device 2 by means of the pressure of the reservoir s 1 or by means of the dosing device 2 itself, if in particular for the self-filling of the dosing ERS 2 depending on the structure of the piston of the dosing device 2 both in thrust

Application / circulation as well as train filling can be driven.

To ensure the function, especially in one Failure of the pump 7, it is provided that the pump is a bypass bridging in the form of a valve

preferably has a non-return or one-way valve or a spill valve. This bypass type

Bypass would be in case of pump 7 failure

Circulation or component conveyance from the reservoir 1 to the dispenser 2 continue to allow, since the component flow as dosing he promotion or as pressure in the direction of dosing he 2 is maintained. Alternatively, it is also envisaged that the pump 7 structurally enables the one-sided flow in the direction and thus function-independent component support in the event of a fault allows and does not prevent. In a concrete

Embodiment is parallel to the pump 7 a

Pump valve 10 available. Depending on the version of the

Pump valve 10 as a one-way valve or controlled valve, it has no or at least a connection to the controller, so that in case of failure without delay the

Operation, for example, as an emergency operation is maintained.

In a particular embodiment, as shown in Figure 5, the pump valve 10 as

Multiway valve assembly 10 executed. Here is a port A at the connection to the reservoir 1, a port B at the connection to the inlet of the pump 7 and a port C at the connection to the meter 2 and the output of the pump 7. Depending on the position of

Mehrwegventilanordnung connections are switched, which on the one hand, the component promotion in one

Normal operation via the pump 7 and on the other hand the

Allow component feeding in case of failure. In normal operation, port A is connected to port B for circulation. A connection to or via the port C of the multi-way valve assembly 10 is blocked. Thus, the pump 7 can promote the components easily. In the event of a fault, port A is connected to port C, so that the components by means of the dosing device 2 with or without Pressurization in the reservoir 1 can continue to circulate and that an application is possible.

An appropriately configured multi-way valve assembly 10 also has the advantage that thereby at

appropriate design and arrangement, the function of the dosing he inlet valve 8 can be mapped. In a third position, output B and output C are connected for this purpose. Thus, the connection to port A and the reservoir 1 is interrupted. The application pressure would thus not act in the reservoir. In conjunction with a suitably pressure-resistant pump housing, the application pressure acts on both ports of the pump 7

alike. Since the application pressure in this case acts up to the pump 7 and the output C of the multi-way valve assembly 10, the connection between the dosing he 2 and the pump outlet and the output C of the multi-way valve assembly 10 is designed as a high-pressure connection. In an alternative embodiment, the pump 7 and the output C are the

Multiway valve arrangement 10 directly at the entrance of

Doser 2 arranged so that the connection is made by means of pressure-tight connections.

For and during the application, the respective component volume of the respective dosing device is 2

continuously supplied to the mixing head 3. The adjustment of the mixing ratio of the components via the controlled emptying of the respective doser 2. Die

Components can be in a parallel arrangement of two, three or more dispensers 2 for each one

Continuously add the component to the mixing head 3. By means of the control of the mixing head 3 is a pulse-like or continuous application as required

possible.

For carrying out the method, the respective connections 4a between the storage container 1 and the pump 7 and, if appropriate, up to the input of the dosing device 2 depending on the configuration of the arrangement, preferably designed for a pressure of up to 60 bar, whereby no special high pressure resistant components are used and

different distances between reservoir 1 and dosing he 2 can be disregarded. Those

Connection 4b between the dosing he 2 and the mixing head 3, which is exposed to the pressure in the range of application pressure, and depending on the configuration and the part of the connection 4a between the doser 2 and the

Pump outlet, is preferably designed as high pressure connection after the respective application pressure. Thus, the structural design meets the maximum prevailing pressures. Elaborate pressure lines throughout the structure can be avoided. This results

Advantages, as without elaborate safety precautions

Maintenance can be done on the system in the range of lower pressures. In addition, the range of high pressure lines is limited to a short range between

Doser 2 and mixing head 3. In particular, in the assembly or arrangement of the metering device 2 to the robot arm itself, are the special holding the application pressure

Pressure pipes as compound 4b only a few inches long. Special pressure equalization can be omitted, since for each mixing head 3 each own dosing he 2 in

close proximity are available.

Simplifying the method and the embodiment, the control of the application takes place by means of the

Robot control of the robot. The application is carried out using a robot, wherein by the

Merging of the controls in the robot control in addition to the interfaces to be adapted also the

Performance and processing speed of the controller can be increased and thus the process more accurate faster and more reliable.

The implementation of the procedure with the respective

individual versions is both in flow mode as also possible in clock mode.

The method with the aid of the arrangement is suitable for the foaming of cavities of Fahrku car bodies, the introduction of acoustic foams in Fahr ku bodies and the foaming molds for the production of seats, seats and center armrests. Thus, there is a wide field of application for a reliable and high quality foaming process.

Figures 1 to 4 each show the schematic structure of an arrangement for carrying out the method and different embodiments. In each case, a compound 4a leads from a reservoir 1 to a doser 2. Between the doser 2 and mixing head 3 is a

Connection 4b arranged, which as high pressure line for the respective working pressure or application pressure

is designed. Depending on the material used and the mixing ratio, this working pressure is between 60 and 350 bar. From the mixing head 3 performs a shut-off valve 9 a

Circulation connection 5 back to the reservoir 1. The reservoir 1 is supplied in each case in the required amounts of component bearing 6. Although the check valve 9 is shown in Figs. 1 to 4, its necessity depends on each

used mixing head 3, which may already be structurally able to prevent circulation during the application.

In the concrete exemplary embodiment, as in FIG. 1

shown, in the connection 4a is a pump 7 and before the dosing he 2 a dosing he inlet valve 8 is arranged.

In addition, Figure 1 shows an arrangement of four components each distributed to two mixing heads 3, wherein a

Scaling is provided and the mixing head 3, the four and possibly more or fewer components are performed. The components can each be equal in pairs, which among other things, a redundancy for the application is generated.

The pump valve assembly 10 is in a suitably designed or suitable pump 7, which thus the

Promotion of components in the direction of circulation

allows, not required.

In the embodiment of Figure 2 shows one of the two stations of Figure 1, wherein at the pump 7 a

Pump valve assembly 10 and in the connection 4a between the pump 7 and the metering he inlet valve 8, a branch 14, formed by a three-way valve, to a

Circulation bypass 12 is arranged. Of the

Circulation bypass 12 is in this specific

Embodiment in the circulation connection. 5

guided. But it is also planned that the

Circulation bypass 12 is also guided directly to the heat exchanger 13 and into the reservoir 1 (not

shown). In addition, in compound 4b

Immediately after the meter 2, a metering erauslassventil 11 available.

As shown in Figure 3, is in another

Embodiment with circulation bypass 12 the

Dosing he inlet valve 8 and the three-way valve of the

Branch 14 executed together in a three-way valve combined. Thus, on the one hand the circulation is achieved during the application, on the other hand is

Reliably prevents the application in

Direction pump 7 or reservoir 1 propagates.

In the embodiment of Figure 4, no pump 7 is included. In the connection 4a is a

Dosing he inlet valve 8 and in the connection 4b a metering erauslassventil 11 is present. The promotion of

Components are hereby without exception on the dosing he 2. Compilation of the reference numerals

1 - Reservoir

2 - Doser

3 - mixing head

4a, 4b - compound

5 - circulation connection

6 - component bearings

7 - pump

8 - Dosing inlet valve

9 - shut-off valve

10 - pump valve, multiway valve arrangement

11 - Dosing outlet valve

12 - circulation bypass

13 - Heat exchanger

14 - branch

15 - electric motor

16 - Transmission

17 - threaded spindle

18 - piston, scraper

19 - cylinder, cylinder chamber

20 - spindle nut

Claims

Claims:

1. A process for the preparation of a two-component or multi-component foam by applying the

mixed components into cavities or shaping

Units or bodies, wherein the respective components from a respective storage container (1) are fed to a mixing head (3), wherein depending on the operation in the

Application, the components under an adjustable pressure by means of a dosing device (2) are supplied to the mixing head (3) or circulate in the circulation between at least the reservoir (1), the doser (2) and the mixing head (3), wherein the specific parameters and

Settings of the components, the dosing device (2), the

Mixing head (3) and the reservoir s (1) are detected and adapted by means of a controller,

characterized,

that the dosage of the respective component by means of at least one electromechanically driven

Volumenkolbendosier unit as dosing (2) and for the circulation of the respective component a promotion at least at and / or past the dosing he (2) is made possible, the dosing (2) during the circulation between 0% to 30% filled is set and

that before the application of the promotion to the doser (2) for filling the doser (2) takes place and

and for the application, the delivery is interrupted at least to the metering device (2) and the metering device (2) promotes the component by the emptying of the mixing head.

2. The method according to claim 1,

characterized ,

in that the components for the circulation and / or filling of the dosing device (2) are conveyed by means of at least one pump (7), in a connection (4a) between the reservoir (1) and the dosing device (2), preferably between the pump (7) and the doser (2), preferably a metering inlet valve (8) for the

Circulation and filling of the dosing (2) is opened and closed for the application, the pump (7) and preferably the dosing he inlet valve (8) are connected to the controller.

3. The method according to any one of claims 1 and 2

characterized ,

in that the delivery of the components for the circulation and filling of the metering device (2) takes place by means of the metering device (2) and / or the pump (7), wherein in the connection (4a) between the reservoir (1) and the metering device (2) , Preferably between the pump (7) and the doser (2), a dosing he inlet valve (8) for the circulation and

Filling the dosing (2) open and for the

Application is closed and that in a compound (4b) between the doser (2) and the mixing head (3) a dosing erauslassventil (11) for filling the dosing (2) closed and opened for circulation and application, wherein the pump (7) preferably the

Dosing he inlet valve (8) and preferably the

Dosing erauslassventil (11) are connected to the controller.

4. The method according to any one of claims 1 to 3,

characterized ,

a shut-off valve (9) is opened for the circulation in the circulation connection (5) between the mixing head (3) and the reservoir (1) and for the application in the circulation connection (5) between the mixing head (3) and the reservoir (1 ) the shut-off valve (9)

is closed, wherein the shut-off valve (9) with the

Control is connected.

5. The method according to any one of claims 1, 2 and 4,

characterized ,

at least during the application, the circulation of the components via a circulation bypass (12) is maintained.

6. Method according to one of the preceding claims, characterized in that

that the reservoir (1) with a pressure between

Atmospheric pressure and 15 bar is applied, wherein with the pressurization on the whole a simplification of the supply or delivery of the respective components to the doser (2).

7. Method according to one of the preceding claims, characterized in that

the application takes place by means of a robot, wherein the control of the application takes place by means of the robot control of the robot.

8. The method according to one of the preceding claims, d a d e r c h e c e n e c e n e,

that the respective component volume of the respective

Doser (2) is continuously fed to the mixing head (3), wherein the adjustment of the mixing ratio of the components via the controlled emptying of the respective doser (2).

9. The method according to one of the preceding claims, d a d e r c h e c e n e c e n e,

the connection (4a) between the storage container (1) and the metering device (2) is operated at a pressure of 0 bar to 60 bar.

10. The method according to any one of the preceding claims, d a d u r c h e c e n e c e n e,

that the connection (4b) between the metering device (2) and the mixing head (3) in particular for the application as

High pressure connection is operated with the respective application pressure.

11. The method according to any one of the preceding claims, characterized in that parallel to the pump (7) a pump valve (10) is present, wherein the pump valve (10) at least as

One way valve (10) and / or overflow valve (10) from

Reservoir (1) to the doser (2) is operated.

12. Arrangement for carrying out the method according to claim 1 to 11 consisting of reservoir (1), dosing (2) and mixing head (3) with connections (4a, 4b) between

Reservoir (1), dosing (2) and mixing head (3) and a circulation connection (5) between the mixing head (3) and reservoir (1), wherein the reservoir (1), the doser (2) and the mixing head (3) connected to a controller,

characterized,

in that the metering device (2) is an electromechanically driven volume piston metering unit and that preferably in the connection (4a) between the pump (7) and the metering device (2) there is preferably a metering inlet valve (8), the metering inlet valve ( 8) is connected to the controller.

13. Arrangement according to claim 12,

characterized,

that in the connection (4a) between the reservoir (1) and the meter (2) a pump (7) and / or in the connection (4b) between the meter (2) and the mixing head a metering erauslassventil (11) is present , wherein the pump (7) and the metering erauslassventil (11) with the

Control are connected.

14. Arrangement according to one of claims 12 and 13,

characterized,

in the circulation connection (5) between mixing head (3) and storage container (1) a shut-off valve (9)

is arranged, wherein the pump (7) and the shut-off valve (9) are connected to the controller.

15. Arrangement according to one of claims 13 and 14,

characterized,

in that before, at or in the metering inlet valve (8) in the connection (4a) a branch (14) with a

Circulation bypass (12) to the circulation connection (5) or to the reservoir (1) is present.

16. Arrangement according to one of claims 13 to 15,

characterized,

that the control of the application is integrated in the robot control of the robot.

17. Arrangement according to one of claims 13 to 16,

characterized,

in that a pump valve (10) is provided parallel to the pump (7), the pump valve (10) having no or at least a connection to the controller.