DE202009017678U1 - Dosing and mixing device for sealants and adhesives - Google Patents

Abstract

Dosing and mixing device (01), in particular portable, for dosing and mixing of at least two substances, in particular of sealants and adhesives, comprising at least two storage containers (02, 03) and a mixing head (14), wherein in the storage container (02, 03 ) a pressure can be built up, as a result of which the substance from the storage container (02, 03) is conveyed, and wherein the mixing head (14) the at least two substances can be fed separately and mixed in the mixing head (14), wherein in the compound from the reservoir (02, 03) to the mixing head (14) at least one valve (06, 07, 12, 13) is arranged, characterized in that in each case between a reservoir (02, 03) and the mixing head (14) has a pumping chamber ( 08, 09) is arranged, wherein a first valve (06, 07) the flow from the reservoir (02, 03) to the pumping chamber (08, 09) and a second valve (12, 13) the flow from the pumping chamber (08, 09 ) can close to the mixing head (14).

Description

The The invention relates to a dosing and mixing device for dosing and mixing at least two substances, these in particular for portable use for the processing of sealants and adhesives is provided.

ever according to the requirements of the bond are different powerful Adhesives and thus different substances required. Especially for higher quality bonding as well as in the production of Seal preparations are usually several components, at least two, a short time before processing at the Adhesive or sealing site mixed together. By means of this So-called 2K adhesives can have very high strengths the adhesion can be achieved. The problem in this case is that from the moment of mixing the different components only a limited amount of time is available for processing. This time span is with common 2K adhesives usually less than an hour. The same applies to the processing of sealants.

For the processing of such adhesives are different systems known in the art. However, these differ significantly in terms of the scope. For one thing, they are big industrial ones Installations are known in which a stationary mixing of the various substances by means of a supply from the individual storage containers takes place. Further processing of the Adhesive takes place immediately near this stationary metering and mixing device. Such systems are used, for example in the manufacture of aquariums relating to the gluing of glass panes together. The advantage of such systems is that large-volume Reservoir can be used and also the dosage and mixture of substances in a largely continuous Process can be done. Furthermore, the dosing and mixing technology be designed for the specific materials to be processed.

In addition to the possibility to mix the two substances by hand in a vessel, in contrast to the industrial plants, there are two 2K glue guns with fabric containers dosed ready in the correct mixing ratio. In systems of this kind, the substances in the appropriate mixing ratio are mixed together directly from the beginning of this supply package by pressing out the storage containers and can be processed and used flexibly, in particular handy. However, these partially executed in tube form adhesive have the disadvantage that from the onset of the supply pack a secure closing of the containers is no longer possible. This means that in any case the entire stock of glue is used up or the rest is discarded. Such a solution of a hand portable execution shows example with additional squeezing the font EP 1 477 418 A2 ,

Another flexible design for a dosing and mixing device shows the font WO 2005/009600 A1 , In this system, several storage containers are kept ready, from which the various substances can be supplied to the mixing device. To realize the supply, the storage containers are pressurized with the individual substances by means of a piston with a pressure, so that the substance is continued to the mixing head. It is known that such adhesives or sealants have a high viscosity and thus flow poorly. To ensure the flow of material from the reservoir to the mixing head therefore a gear pump can be used. An advantage of this design is that large containers can be kept with individual substances and thus a refilling of the reservoir is required only in small cycles.

Due to the problem that the aforementioned embodiment is only conditionally transportable, an especially mobile expression device in the document is alternatively DE 10 2006 037 585 A1 presented. In this case, in turn two reservoirs are pressurized by means of a piston, so that the material can be discharged through a mixing head. To realize the correct mixing ratio, the corresponding storage containers are selected in their geometry or in the cross-sectional area according to the mixing ratio. By means of a mobile drive, in this case a cordless screwdriver, a linear piston movement is generated via a transmission, which triggers a simultaneous material outlet from the storage containers. This type of device creates a particularly mobile and flexibly usable dosing and mixing device for adhesive. A disadvantage over the previous solution, however, is that the mixing ratio can not be adjusted flexibly.

Unchanged is disadvantageous in all mobile versions that takes place with dawn of the storage container mixing, the supply to the reservoir can not be sealed tight. As a result, it comes to curing or dehydration of the entire material over a longer period. In this respect, these embodiments require in any case a continuous consumption of the storage container until it is emptied. In a mobile use of appropriate sealants and adhesives, however, the problem is that always a very different amount is required. Between different uses, a longer period of time can lie so that there is damage to the material in the storage containers. In this respect, such mobile devices are only in the case when the residual material in the reservoir due to its low value and the opposite consumption no consideration must be taken and this can be discarded.

To reduce the loss of material in mobile devices while increasing the flexibility in the application suggests the font DE 10 2006 021 684 A1 to use a modular dosing system. This mixing and dosing system consists of several modular units, such as the respective storage tanks, the piping system, the pump system and the filling system. In this respect, it is possible to disassemble this modular system for transport and reassemble for use at the site. This makes it possible to produce both flexible mixing ratios, as well as to reduce the non-recyclable material residue to a minimum. However, a cleaning of the open lines from the reservoir to the mixing device is required. If the system is used in a predominantly continuous use in one place and only occasional change of position takes place at another location, this embodiment combines the advantages of the mobile metering device with those of the performance of stationary systems.

Out known in the art solutions for the production of mixing and metering devices, however, the gap remains between a small hand dose, where the residual material discarded must, and the stationary plant, which basically not transportable.

task It is therefore an object of the present invention to provide a transportable metering and mixing device to provide, on the one hand the material in the Reservoir undamaged for a long time can remain and yet at the same time created a mobile device which is easily transported from one place to another can be. Furthermore, this is to be interpreted such that they for highly viscous substances, in particular sealants and adhesives, can be used.

The Task is achieved by the inventive design solved according to the teaching of claim 1.

advantageous Embodiments are subject of the dependent claims.

A Dosing and mixing device is used for dosing and mixing at least two substances. In this respect, the metering and mixing device comprises at least two storage tanks and a mixing head. To a mass transfer to allow from the reservoir to the mixing head, can the reservoir be pressurized, As a result, the substance is conveyed from the reservoir. The different substances are fed separately to the mixing head and mixed by means of the advantageous construction of the mixing head. For the construction of the mixing head are different solutions available, which are well known to the skilled person and therefore should not be further subject of the present invention. Furthermore, for the safe separation of the material flow between the reservoir and the mixing head at least one valve arranged. Consequently, with this valve, the flow of the respective Stoffes be locked.

essential to the invention is it that between the reservoir and the mixing head in each case a pumping chamber is arranged. Here is a first valve arranged between the reservoir and the pumping chamber and a second valve between the pumping chamber and the mixing head.

By the solution according to the invention makes it possible ensure the flow of material from the reservoir to the mixing head to be able to complete, thus a long shelf life the substances in the reservoir without quality restriction to be able to realize. This was exclusive before in stationary systems in a large industrial style possible. To realize the flexible dosage as well enabling the processing of highly viscous substances realized the mass transport via the pumping chamber.

In particularly advantageous embodiment may be in the pumping chamber a vacuum can be generated while at the same time in the reservoir there is an overpressure. At this stage, the first valve opened between reservoir and pumping chamber, while, on the other hand, the second valve between the pumping chamber and the mixing head is closed. Consequently, a mass transfer triggered by the reservoir into or to the pumping chamber. Due to the simultaneous application of positive and negative pressure Thus, a highly viscous substance can be processed. In the further State, the first valve is closed, and the overpressure in the pantry can be omitted. As a result, the second valve opened and built an overpressure in the pumping chamber. By appropriate pressure in the pumping chamber, the substance for Promoted mixing head.

In particular, by the choice of the introduction of force by generating corresponding negative pressure or overpressure in the pumping chamber, it is possible to promote a highly viscous substance. This requires a lower than the prior art overpressure in the Vorratskam to trigger the material flow. In this respect, simplifies the design of the storage container in terms of pressure stability and pressure build-up in the reservoir. The discharge of the substance to the mixing head takes place by the overpressure in the pumping chamber. Since it is sufficient to promote the amount of material for a cycle of the pumping chamber, this can be significantly smaller than the reservoir precipitate. Consequently, it is possible to let significantly higher pressures act within the pumping chamber, as this is necessary in the reservoir. In this respect, this creates the opportunity to process with a portable metering and mixing device highly viscous substances.

The Application of the overpressure in the storage containers takes place in a simple manner directly or indirectly by means of a pneumatic or hydraulic system. In this respect, it is unnecessary this embodiment of the expense of an additional Drive mechanics, such. As a transmission, the reservoir. Furthermore, this type of power generation offers, because thus a drive unit, for. As an electric motor, not on the portable Metering and mixing device must be mounted, but only a connection for connection to an external pressure supply must be provided. Pressure supply systems, in particular for Pneumatics, are usually at construction sites or other places of work available. In this respect, the fluid acts in this solution the pressure supply system - pneumatic or hydraulic - directly in the reservoir on the fabric, and thus act in the fabric essentially the same pressures as in the fluid. To one Excluding damage to the substance is advantageously the Fluid via a movable partition in the reservoir separated from the fabric.

As well Of course it is also possible to use an electric operated linear actuator or pneumatic or hydraulic piston for Generation of the necessary pressure in the substance to use.

advantageously, In the same course, the pumping chamber is also hydraulically controlled or pneumatic cylinder actuated. For simplification the structure is in a simple embodiment, the pressure in the storage containers or the positive and negative pressure generated in the pumping chambers by means of the same medium. For example If an external compressed air supply system can be connected, which provides a constant air pressure, this air pressure in particular the same size both in the reservoir as well as acting in the drive cylinders for the pumping chambers.

Corresponding the advantageous application of pneumatics or hydraulics is the Pumping chamber advantageously by means of a pneumatic or hydraulic cylinder driven. Consequently, by means of the movement of the pneumatic or Hydraulic cylinder of the positive or negative pressure in the pumping chamber generated. In this respect, no other type of drive is required. Nevertheless, here also an electric linear drive be used, as in the pumping chamber, a propulsion in two directions to generate the underpressure and the overpressure required is, and thus the advantage of a pneumatic cylinder weighs less as the reservoir, where there is no additional Cylinder needs.

Provided in the dosing and mixing device always only the same substances can be processed, advantageously the Volumes of the pumping chambers are selected such that this essentially the mixing ratio of the respective Correspond to substances. However, the pumping chambers are preferably so executed that at least one volume of a pumping chamber or the volumes of all pumping chambers within a certain range adjustable are. On the one hand, the mixing ratio can thus be varied to find the optimal processing point. The other is thus also ensures that different substances in the Dosing and mixing device according to the invention can be used.

The Adjustment of the receiving volume of at least one pumping chamber can done in different ways. In a preferred embodiment For this purpose, a control unit is present at the dosing and mixing device. By means of this control unit, the mixing ratio or the receiving volume of at least one pumping chamber set become.

At a pumping chamber itself can adjust the recording volume advantageous for the substance to be delivered the adjustment of the working stroke of the driving cylinder varies become.

As a portable metering and mixing device, it is furthermore particularly advantageous if standardized substance containers can be used without a transfer of material from one container to another container being required. This is particularly problematic because, in the case of corresponding 2K adhesives, opening the container fundamentally leads to damage to the material. In this respect, the time during which the corresponding substance is exposed to the ambient air must be kept to a minimum. Accordingly, the storage containers are advantageously designed so that can be used in these standardized cartridges. Accordingly, the storage container can be opened at one end for material change or for refilling of material and the previously emptied or replaced de cartridge are removed and a new cartridge after opening of its ends are inserted into the reservoir. In this respect, the process of inserting material containers is done in a short time, without causing damage to the substance in the cartridge.

Regarding the choice of substances makes this invention possible Device, a substance with a viscosity of over 100 Pa · s, in particular of over 250 Pa · s, to process. For fabrics of such toughness it is As a rule, not possible, the substance directly from one Squeeze reservoir to this directly the mixing head supply. Only by the invention Solution it is possible, such high-viscosity substances to process.

The Dosing and mixing device according to the invention enables a new dosing and mixing process of at least two substances. Here, the substances, in particular sealants and adhesives, a particularly high viscosity exhibit. The application may advantageously enough with the appropriate portable dosing and mixing device done.

• a) dem Schließen des zweiten Ventils und dem Öffnen des erstens Ventils;
• b) dem Aufbringen von Überdruck auf den Stoff im Vorratsbehälter und dem gleichzeitigen Aufbringen von Unterdruck in der Pumpkammer mit einem Stofffluss vom Vorratsbehälter in die Pumpkammer;
• c) dem Schließen des ersten Ventils und dem Öffnen des zweiten Ventils;
• d) dem Aufbringen von Überdruck auf den Stoff in der Pumpkammer mit einem Stofffluss von der Pumpkammer in den Mischkopf;
• e) dem Vermischen der zumindest zwei Stoffe im Mischkopf.

For this purpose, a method for dosing and mixing of at least two substances, in particular of high-viscosity sealants and adhesives, is used, wherein a portable dosing and mixing device according to one of the claims is used, characterized by the following process sequence with:

• a) closing the second valve and opening the first valve;
• b) the application of pressure to the substance in the reservoir and the simultaneous application of negative pressure in the pumping chamber with a flow of material from the reservoir into the pumping chamber;
• c) closing the first valve and opening the second valve;
• d) the application of excess pressure to the substance in the pumping chamber with a flow of material from the pumping chamber into the mixing head;
• e) the mixing of the at least two substances in the mixing head.

The method according to the embodiment of the invention, which is made possible by the dosing and mixing device presented, is characterized by the following process sequence:
Between a pumping chamber and the mixing head is a valve, which is initially closed. At the same time another valve between a reservoir and the pumping chamber is opened.

in the The following is an overpressure on the substance in the reservoir applied, wherein at the same time generates a negative pressure in the pumping chamber becomes. This pressure difference between reservoir and pumping chamber creates a flow of material from the reservoir into the pumping chamber. This is due to the high pressure difference even at high viscosity Given substances.

in the following step, the first valve is closed and the second Valve opened.

Now an overpressure on the substance is produced in the pumping chamber, which in turn causes a flow of material from the pumping chamber into the mixing head triggers. Here, the overpressure in the pumping chamber clearer be designed as the pressure in the reservoir in the previous step.

Finally it comes to the mixing of at least two substances in the mixing head with subsequent discharge of the mixed substance.

For the skilled person it is obvious that in the use of the invention Dosing and mixing device due to the cyclic operation for generating a z. B. 2K adhesive on the one hand in one single cycle produces a small portion of the mixture once can be. On the other hand, it is also possible, the process automatically repeat cyclically. In this case comes it usually leads to a corresponding cyclical discharge of the substance mixture from the mixing head. A high toughness leads in This case also causes the material to slow down too the time of closing the second valve addition exit and thus the phase without material supply low fails.

It it is known that curing for a longer period of time of the material in the mixing head takes place. To safely exclude this, can be used advantageously a maintenance process. For this purpose is at a time interval that is about half the curing time corresponds, one cycle driven and one shot of the mixture promoted. In conventional 2K adhesives is the advantageous time interval about 20 minutes to 30 minutes. Insofar is at low Material loss through this process step a hardening prevented in the mixing head.

in the Case of prolonged process shutdown, z. B. for transport or for storage, it is advantageous if the mixing head is removed becomes. In this case, the mounting flange of the excess Cloths cleaned and then greased. This certainly prevents the further mixing of the components and their hardening. For protection, the screw-on flange is then covered with a foil and from a cap to protect the grease and the film and the Screw thread closed.

In the following figures is the invention Structure shown in schematic diagrams. Show it:

1 a schematic diagram of an arrangement according to the invention in the first step of mass transfer;

2 a schematic diagram too 1 with a second step of mass transport.

In 1 is shown schematically by way of example of the invention essential structure. The dosing and mixing device 01 In this example, there are two reservoirs 02 and 03 in which corresponding filling volumes 04 respectively. 05 the individual substances A and B are present. The available volumes of the individual reservoirs can be chosen both the same and different, depending on the availability of standardized cartridges for the respective substances. In the flow of material after the storage container 02 . 03 following is in each case a first valve 06 and 07 arranged. This is open in the first step. From this valve 06 . 07 There is always a connection to a pumping chamber 08 and 09 , These provide for each substance according to the mixing ratio matching pumping volume 10 respectively. 11 to disposal. In this case, the size of the pumping chamber can be aligned with a mixing ratio which is generally encountered. Preferably, the exact adjustment of the mixing ratio or the size of the pumping volume 10 respectively. 11 made on the setting of the working hub at least on a pumping chamber. Following the pumping chamber 08 respectively. 09 in the course of a second valve follows 12 and 13 and regulates the flow to the mixing head 14 , This is initially closed. When applying an overpressure in the storage containers 02 and 03 on the substances and simultaneous application of a negative pressure in the pumping chambers 08 and 09 a material flow takes place from the storage volume 04 respectively. 05 into the pump volume 10 respectively. 11 ,

To After completion of this flow of material, the first valve is closed.

In 2 is outlined that the overpressure in the reservoir 02 respectively. 03 is omitted, whereas in the pumping chamber 08 respectively. 09 an overpressure is built up. At the same time, the second valve 12 respectively. 13 open. As a result, this leads to a flow of material from the pumping chamber 08 respectively. 09 to the mixing head 14 , There, the two substances are mixed and can be processed as an adhesive.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• EP 1477418 A2 [0004]
• WO 2005/009600 A1 [0005]
• - DE 102006037585 A1 [0006]
• DE 102006021684 A1 [0008]

Claims (10)

Dosing and mixing device ( 01 ), in particular portable, for dosing and mixing at least two substances, in particular of sealants and adhesives, comprising at least two storage containers ( 02 . 03 ) and a mixing head ( 14 ), wherein in the reservoir ( 02 . 03 ) a pressure can be built up, as a result of which the substance from the reservoir ( 02 . 03 ), and wherein the mixing head ( 14 ) the at least two substances are fed separately and in the mixing head ( 14 ) can be mixed, wherein in the connection from the reservoir ( 02 . 03 ) to the mixing head ( 14 ) at least one valve ( 06 . 07 . 12 . 13 ), characterized in that in each case between a storage container ( 02 . 03 ) and the mixing head ( 14 ) a pumping chamber ( 08 . 09 ), wherein a first valve ( 06 . 07 ) the flow from the reservoir ( 02 . 03 ) to the pumping chamber ( 08 . 09 ) and a second valve ( 12 . 13 ) the flow from the pumping chamber ( 08 . 09 ) to the mixing head ( 14 ). Dosing and mixing device ( 01 ) according to claim 1, characterized in that in the pumping chamber ( 08 . 09 ) a negative pressure and an overpressure can be generated, wherein the first valve ( 06 . 07 ) is opened at negative pressure and the second valve ( 12 . 13 ) is closed, and wherein at overpressure the first valve ( 06 . 07 ) and the second valve ( 12 . 13 ) is open. Dosing and mixing device ( 01 ) according to claim 1 or 2, characterized in that the overpressure in the storage containers ( 02 . 03 ) can be generated pneumatically or hydraulically with a fluid, wherein the pressure in the fluid and in the substance is substantially equal, and wherein the fluid is also in the reservoir. Dosing and mixing device ( 01 ) according to claim 3, characterized in that for generating the overpressure in the storage containers ( 02 . 03 ) and the positive or negative pressure in the pumping chambers ( 08 . 09 ) the same fluid is used at the same pressure. Dosing and mixing device ( 01 ) according to claim 3 or 4, characterized in that the pumping chamber ( 08 . 09 ) comprises a pneumatic or hydraulic cylinder or an electric linear drive for generating the positive and negative pressure. Dosing and mixing device ( 01 ) according to one of the preceding claims 1 to 5, characterized in that the pumping chambers ( 08 . 09 ) have a fixed or adjustable receiving volume for the substances, which essentially corresponds to the mixing ratio of the respective substances. Dosing and mixing device ( 01 ) according to claim 6, characterized in that the device comprises a control unit by means of which the receiving volume of at least one pumping chamber can be adjusted. Dosing and mixing device ( 01 ) according to claim 6 or 7, characterized in that the receiving volume of at least one pumping chamber can be changed by means of an adjustment of the working stroke. Dosing and mixing device ( 01 ) according to one of the preceding claims 1 to 8, characterized in that the storage containers ( 02 . 03 ) are designed such that can be used in these standardized cartridges. Dosing and mixing device ( 01 ) according to one of the preceding claims 1 to 9, characterized in that the device ( 01 ) is suitable for processing at least one substance which has a viscosity of more than 100 Pa · s, in particular more than 250 Pa · s.