EP2810719A1 - Dispositif d'alimentation pour un agent de revêtement et correspondant procédé de fonctionnement - Google Patents

Dispositif d'alimentation pour un agent de revêtement et correspondant procédé de fonctionnement Download PDF

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Publication number
EP2810719A1
EP2810719A1 EP20140002527 EP14002527A EP2810719A1 EP 2810719 A1 EP2810719 A1 EP 2810719A1 EP 20140002527 EP20140002527 EP 20140002527 EP 14002527 A EP14002527 A EP 14002527A EP 2810719 A1 EP2810719 A1 EP 2810719A1
Authority
EP
European Patent Office
Prior art keywords
coating agent
storage container
metering device
coating
piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20140002527
Other languages
German (de)
English (en)
Other versions
EP2810719B1 (fr
Inventor
Rainer Melcher
Semih Erlik
Frank Herre
Manfred Michelfelder
Michael Baumann
Herbert Martin
Bernhard Seiz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Duerr Systems AG
Original Assignee
Duerr Systems AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Priority claimed from DE102005048223A external-priority patent/DE102005048223A1/de
Priority claimed from DE102005060959A external-priority patent/DE102005060959A1/de
Application filed by Duerr Systems AG filed Critical Duerr Systems AG
Publication of EP2810719A1 publication Critical patent/EP2810719A1/fr
Application granted granted Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1608—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive
    • B05B5/1616—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material
    • B05B5/1625—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material the insulating means comprising an intermediate container alternately connected to the grounded material source for filling, and then disconnected and electrically insulated therefrom
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • B05B12/1409—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet the selection means being part of the discharge apparatus, e.g. part of the spray gun
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1608—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive
    • B05B5/1616—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material
    • B05B5/1625—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material the insulating means comprising an intermediate container alternately connected to the grounded material source for filling, and then disconnected and electrically insulated therefrom
    • B05B5/1641—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material the insulating means comprising an intermediate container alternately connected to the grounded material source for filling, and then disconnected and electrically insulated therefrom an additional container being provided downstream the intermediate container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1608—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive
    • B05B5/1675—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive the supply means comprising a piston, e.g. a piston pump
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • B05B12/1418—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet for supplying several liquids or other fluent materials in selected proportions to a single spray outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • B05B12/1463—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet separate containers for different materials to be sprayed being moved from a first location, e.g. a filling station, where they are fluidically disconnected from the spraying apparatus, to a second location, generally close to the spraying apparatus, where they are fluidically connected to the latter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
    • B05B13/0431—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation with spray heads moved by robots or articulated arms, e.g. for applying liquid or other fluent material to 3D-surfaces

Definitions

  • the invention relates to a coating agent supply device, in particular for a paint shop, and an associated operating method according to the preamble of the independent claims.
  • WO 2004/037436 A1 is a multi-axis painting robot known, which has a rotary atomizer as an application device and can be used, for example, for painting automotive body panels.
  • the supply of the paint to be applied takes place here by a piston dispenser, which is mounted on an arm of the painting robot and is at a high voltage potential, so that the applied by the rotary atomizer paint is electrically charged, resulting in a good order efficiency over the electrically grounded motor vehicle body parts or the other components to be painted.
  • a color changer is still arranged, which is supplied via numerous color supply lines with paints of different colors, the color changer allows the selection of the desired color and supplies the piston dispenser with the associated paint.
  • the color changer In operation, the color changer is at an electrical ground potential, so that the numerous color leads must not be made electrically insulating. However, the connection between the color changer and the piston dispenser takes place through an insulation tube, which provides electrical insulation between the color changer lying at ground potential and that for painting ensures high-voltage potential piston dispenser. The electrical potential separation between the color changer and the piston dispenser is achieved by rinsing and cleaning the insulation tube.
  • the piston dispenser must be refilled even without a color change when the entire filling volume of the piston dispenser has been applied by the rotary atomizer.
  • the refilling of the piston dispenser by the color changer is also relatively time-consuming, which slows down the painting process.
  • a painting robot is also known in which a metering pump and a color changer are arranged together in a robot arm of the painting robot, which is associated with the disadvantages mentioned above.
  • the atomizer can be optionally connected to one of the two piston dispenser, while the other piston dispenser is filled.
  • the selection of the desired piston meter takes place here by a complex turning mechanism.
  • Out DE 691 09 823 T2 and DE 690 01 744 T2 is an electrostatic paint spraying system with two coating agent known, which are arranged one behind the other in the flow direction and separated by an insulating distance.
  • the separation of the two coating agent tanks by the insulating section makes it possible to place the downstream coating agent tank at high voltage potential during the paint application, while the upstream coating agent tank is at ground potential and therefore can be easily filled with paint.
  • the invention is therefore based on the object to improve the known painting robot described above accordingly.
  • the invention includes the general technical teaching not to fill the coating agent metering device (eg a piston dispenser) directly from the color changer, but indirectly via a coating agent storage container located therebetween.
  • This offers the possibility that the coating agent storage container is already filled during coating with coating material and not only in the color change times, which contributes to a reduction of the color change times.
  • the transfer from the coating agent storage container into the coating agent metering device can be done due to the short and direct connection with very large volume flow.
  • the continuous filling of the coating agent storage container during painting also offers the advantage that due to the time available for filling relatively small paint volume flows in the supply lines (eg color loop lines and special paint supply) sufficient so that the associated lines can have a smaller cross-section, whereby the installation costs are reduced.
  • a coating agent dosing or dosing preferably denotes a device with which the application device to be supplied coating amount (instantaneous flow) can be changed depending on demand, for example, depending on the respective workpiece area and other parameters during the coating, such as in EP 1 314 483 A2 or DE 691 03 218 T2 is explained.
  • This possibility does not exist in known systems in which only by controlled adjustment of a piston, the filling volume of a container is set, such as at DE 690 01 744 T2 ,
  • the coating agent metering device is preferably at a high-voltage potential, while the coating-material storage container is at a near-ground potential (preferably ground potential), the coating-material storage container being connected to the coating agent metering device via an insulating line, around the coating material at high-voltage potential Doser isolate against the grounded coating agent storage tank.
  • the electrical potentials of the coating agent metering agent and the coating agent storage container are preferably switchable, so that the coating agent metering device is brought to high voltage potential only for painting, whereas the high voltage for filling the coating agent metering device can be switched off.
  • the insulating section may in this case consist of an insulation tube in which a scraper (for example a stripping piston or a sealing head) is displaceable in order to remove residues of coating agent from the inner wall of the insulating section.
  • a scraper for example a stripping piston or a sealing head
  • this cleaning of the insulating section prevents the insulation capacity of the insulating section from being impaired by coating agent residues which have remained in the insulating section.
  • contamination of the residual coating agent residues in the insulating section is avoided by cleaning the insulating section, which is particularly important in a color change.
  • the movement of the scraper in the insulating distance in one direction or in both directions by a piston rod which can be driven, for example, electrically, pneumatically or hydraulically.
  • the piston rod preferably consists of an electrically insulating material in order to achieve the desired insulation effect.
  • a material for the piston rod is particularly suitable ceramic, since ceramic has a good electrical insulation capability and also has a high mechanical rigidity, which is important for the dosing accuracy. In addition, ceramic has a high abrasion and wear resistance.
  • the piston rod is made of steel. In this case, the scraper must be moved back with the piston rod for electrical isolation.
  • the scraper is not fixedly connected to the piston rod, but freely movable in the insulating section.
  • the scraper can only be pushed in the Isolierrange of the piston rod.
  • the movement of the scraper in the other direction takes place in contrast, by a one-sided pressurization of the scraper.
  • the scraper in the Isolierzone is completely free to move, so that is dispensed with a piston rod to drive the scraper.
  • the movement of the scraper is also done by a one-sided compressed air of the scraper on the desired side.
  • the scraper can therefore be acted upon on both sides with compressed air.
  • the scraper is moved in the one direction towards the coating agent metering device by means of compressed air, while the scraper with the remaining coating agent is pushed back by the coating agent metering device.
  • connection between the coating agent storage container and the coating agent dosing is not permanent by an insulation tube, but by a detachable docking interface.
  • the coating agent storage container When the coating agent storage container is filled, it is then located at a potential close to the earth, separate from the docking interface, and is then separated from the coating agent supply line for filling the coating agent metering device and connected to the docking interface, with the coating agent storage container then being disposed thereon High voltage potential is like the coating agent dosing.
  • the coating agent storage container can thus be moved between the high-voltage potential of the coating agent metering device and the near-earth potential of the coating agent supply line.
  • the coating agent storage container may also be connected directly to the coating agent supply line and / or be mounted on the axis 7 of the painting robot.
  • the atomizer is grounded after painting (in the case of high voltage) and docked at the meantime filled coating agent storage container for filling. After completing the filling process is undocked. Now you can paint (if necessary with HS).
  • the connecting line between the coating agent storage container and the coating agent metering device consists of a piggable tube which is emptied by means of a pig after the transfer process (coating agent storage container ⁇ coating agent metering device). This is also the potential separation.
  • the docking interface for the connection of the coating agent metering device with the coating agent storage container can in this case be mounted in the painting robot, for example in a robot arm, so that the docking interface with the painting robot is movable.
  • a color changer can also be arranged in the painting robot.
  • the docking interface is arranged stationary outside the painting robot.
  • the docking interface there is the possibility that the docking interface mittex with the painting robot by the docking interface is mounted for example on the axis 7 of the painting robot.
  • the coating agent storage container on an adjustable storage volume, wherein the storage volume is adjustable for example by a compressed air-operated piston.
  • this offers the possibility that the new coating agent remaining in the coating agent storage container after the filling of the coating agent metering device is again forced out of the coating agent storage container back into the coating agent supply line, which is also referred to as "reflow".
  • this "reflow” reduces the coating agent consumption, since the new coating agent remaining in the coating agent storage container after the filling of the coating agent metering device can continue to be used.
  • the cleaning of the coating agent storage container is facilitated thereby, so that less detergent is needed.
  • the coating agent metering device is preferably a piston dispenser, as described, for example, in the document mentioned above WO 2004/037436 A1 is described.
  • the content of this document is therefore the present description with regard to the structure and operation of a piston dispenser.
  • the invention is not limited to piston dispensers with regard to the type of coating agent dispenser, but in principle can also be implemented with other types of dispensers.
  • the coating agent storage container is preferably a cylinder with a storage piston which is displaceably arranged in the cylinder, wherein the drive of the storage piston can be carried out, for example, by an electric motor, hydraulically or pneumatically.
  • the position of Storage piston then determines the storage volume of the coating agent storage container.
  • the coating agent metering device and the coating agent storage container are integrated in a common cylinder.
  • this variant of the common cylinder is separated by a centrally disposed in the cylinder partition wall into two sub-cylinders, wherein in one sub-cylinder of the metering of the coating agent metering device is displaceable, while in the other sub-cylinder of the storage piston of the coating agent storage container is displaceable.
  • the drive of the metering piston is preferably carried out by a piston rod, while the drive of the accumulator piston is preferably carried out pneumatically.
  • no dividing wall is arranged in the common cylinder.
  • the storage volume of the coating agent storage container is in this case on the back of Dosierkolbens, wherein in this storage volume of the common cylinder of the accumulator piston is slidably disposed, the drive of the accumulator piston is preferably carried out pneumatically.
  • the pneumatic pressure to drive the accumulator piston then acts not only on the accumulator piston, but also on the back of Dosierkolbens, so that the drive of the metering piston should be mechanically sufficiently rigid and therefore preferably takes place by a piston rod.
  • the coating agent storage container by a section of a Ring line formed.
  • Such loops are known per se in paint shops and described for example in Pavel Svejda: “Processes and Application Methods” (Vincentz Verlag), page 106 et seq.
  • the structural design of loop systems reference is therefore made to avoid repetition of the above publication, the content of the present description is attributable to the full extent.
  • the ring line has in this variant of the invention at least two shut-off valves, which are arranged one behind the other in the ring line in the flow direction and can separate a portion of the loop between the two shut-off valves of the rest of the loop in the closed state.
  • the shut-off valves are in this case arranged so that there is a removal point in the ring line between the two shut-off valves, through which the coating agent can be removed from the loop.
  • Such removal points may be formed for example as T-outlets, which can be closed with a ball valve.
  • the removal points may each have an automatically operating docking valve which automatically opens when a sampling line is docked and is otherwise closed.
  • the “squeeze-out tube” has a flexible inner tube through which the coating agent flows. Furthermore, the “squeeze-out tube” on a rigid outer shell, which surrounds the flexible inner tube outside, wherein there is a sealed annulus between the outer shell and the inner tube. Furthermore, the “squeeze-out tube” has an inlet which opens into the annular space between the rigid outer shell and the flexible inner tube and over which a pressure medium can be introduced into the annulus to compress the flexible inner tube. Preferably, an outlet is further provided which branches off from the annular space between the rigid outer shell and the flexible inner tube and allows a discharge of the pressure medium from the annulus to adjust the pressure in the annulus and thus the desired compression of the flexible inner tube.
  • the flexible inner tube By a suitable supply or discharge of the pressure medium in the annulus, the flexible inner tube can be compressed almost arbitrarily to express the located in the inner tube coating agent on the removal point.
  • the "squeeze-out tube” thus forms a coating agent storage container, from which the intermediately stored coating agent can be pressed via the removal point into the coating agent metering device, when it is docked to the removal point.
  • the invention is particularly advantageous for the application of water-based paint, but the invention is not limited to water-based paint with respect to the coating agent to be applied, but in principle also feasible with other types of coating agents.
  • the invention comprises not only the above-described coating agent supply device according to the invention, but also a complete painting robot with such a coating agent supply device.
  • the coating agent metering device and the coating agent storage container are preferably arranged in or on one or more robot arms of the painting robot.
  • the invention also encompasses a corresponding operating method, as already apparent from the present description of the coating agent supply device according to the invention.
  • FIG. 1 illustrated embodiment of a coating agent supply device according to the invention described, which may be arranged for example on a robot arm of a painting robot, as in the already mentioned above document WO 2004/037436 A1 is described for a conventional coating agent supply device, so that the contents of this document with respect to the structure and operation of the painting robot and the other components of the present description is fully attributable.
  • the illustrated coating agent supply device has a coating agent metering device 1, which in this exemplary embodiment is a piston metering device.
  • the coating agent metering device 1 has a cylinder 2 and a metering piston 3 displaceable in the cylinder 2 in the direction of the arrow, the drive of the metering piston 3 being effected mechanically by a push rod 4, which can be driven, for example, by an electric motor, pneumatically or hydraulically.
  • a metering volume 5 which is adjustable by a displacement of the metering piston 3 in the cylinder 2.
  • the metering volume 5 with the coating agent contained therein (eg water-based paint) is in operation on a High voltage potential, as symbolized by the high voltage sign shown.
  • the coating agent delivered by the coating agent supply device is therefore also at a high-voltage potential, which contributes to a good application efficiency in the case of an electrostatic coating.
  • the metering volume 5 opposite side of the cylinder 2 and the push rod 4, however, is at a ground potential, as symbolized by the grounding sign also shown.
  • For electrical isolation of the cylinder 2 and the push rod 4 therefore consist of an electrically insulating material.
  • the material of the cylinder 2 and the push rod 4, however, must be sufficiently rigid on the other hand, in order to achieve a sufficient metering accuracy.
  • the materials and structural details required for potential separation are, for example, in the document DE 102 33 633 A1 so that the contents of this document are fully attributable to the structure and operation of the coating agent metering device 1 of the present specification.
  • a coating agent storage container 6 which consists essentially of a cylinder 7 and a displaceable in the cylinder 7 accumulator piston 8, wherein the accumulator piston 8 is pneumatically driven via a compressed air line 9 and thus an adjustable Storage volume 10 in the cylinder 7 includes.
  • the entire coating agent storage container 6 is in this case at a ground potential, as symbolized by the grounding symbol.
  • the supply of the coating agent storage container 6 is effected by a coating agent supply line 11, which opens into the storage volume 10 and emanates, for example, from a conventional color changer or a loop.
  • the accumulator piston 8 can be acted upon via the compressed air line 9 with a counter pressure, which is adjusted so that the removal takes place from the loop with the desired volume flow.
  • the withdrawn volume flow also depends on the viscosity of the removed coating agent.
  • a low viscosity of the coating agent leads to a relatively large volume flow from the loop.
  • a high viscosity of the coating agent leads to a correspondingly low volume flow during removal.
  • the viscosity of the coating agent is therefore preferably taken into account, so that the filling of the coating agent storage container 6 is always independent of the viscosity of the coating agent with a constant low flow rate.
  • the filling of the coating agent storage container 6 is preferably carried out until the accumulator piston 8 abuts a predetermined stop, whereby the maintenance of a defined filling quantity is ensured.
  • the pneumatic backpressure on the accumulator piston 8 is set at the beginning of a removal to a predetermined value and then not regulated.
  • the back pressure is then not regulated, but increases with increasing filling of the coating agent storage container 6 accordingly, so that the back pressure is a measure of the degree of filling of the coating agent storage container 6.
  • the back pressure is continuously measured.
  • the filling of the coating agent storage container 6 is then terminated. At a defined initial volume flow at the beginning of the filling of the coating agent storage container 6 is filled in this way with a defined amount of the coating agent.
  • the coating agent storage container 6 From the storage volume 10 of the coating agent storage container 6 further branches off an insulation tube 12, which opens into the metering volume 5 of the coating agent metering 1, the insulation tube 12 in the deflated and cleaned state, the coating agent storage container 6 with respect to the coating agent metering device 1 electrically insulated , which in itself from the already mentioned document WO 2004/037436 A1 is known, so that its content in terms of the structure and operation of the insulating tube 12 of the present description is fully attributable.
  • the insulation tube 12 has a larger line cross-section than the coating feed line 11, so that the coating agent metering device 1 as quickly as possible from the Coating agent storage container 6 can be filled, as will be described in detail.
  • the smaller line cross section of the coating agent supply line 11 is harmless, since the filling of the coating agent storage container 6 takes place during painting, so that sufficient time is available for the filling of the coating agent storage container 6.
  • the lower cost of the smaller cross-section of the coating agent supply line 11 is advantageous since smaller lines can be used.
  • FIGS. 2A and 2 B show an alternative embodiment of a coating agent supply device according to the invention, which is largely similar to that described above and in FIG. 1 corresponds to the embodiment shown, so that to avoid repetition of the above description FIG. 1 is referenced.
  • a special feature of this exemplary embodiment is that the coating agent storage container 6 in this case is not permanently connected to the coating agent metering device 1 via the insulation tube 12. Instead, the coating agent storage container 6 is movable between two positions, which in the FIGS. 2A and 2 B are shown.
  • FIG. 2A shown position is the coating agent storage container 6 with the coating agent supply line 11, but separated from the coating agent doser 1 and then is at an electrical ground potential. In this position, the filling of the coating agent storage container 6 takes place via the coating agent supply line 11.
  • the coating agent storage container 6 is connected via a docking interface 13 to the coating agent metering device 1, but separated from the coating agent supply line 11 and then is at the same high voltage potential as the coating agent meter 1. In this position, the transfer takes place of the coating agent from the coating agent storage container 6 into the coating agent metering device 1.
  • the coating agent storage container 6 is first filled with the new coating agent via the coating agent supply line 11, the coating agent storage container 6 being separated from the docking interface 13, as in FIG FIG. 2A is shown. During this filling of the coating agent storage container 6, the coating agent dispenser 1 can continue to dose the old coating agent, so that no filling of the coating agent storage container 6 interrupting the painting process is required and therefore sufficient time for filling available.
  • the coating agent storage container 6 After filling of the coating agent storage container 6, the coating agent storage container 6 is then connected after further intermediate steps with the docking interface 13, which in FIG. 2B is shown. After the connection with the docking interface 13 has been established, it is then possible to store in the storage volume 7 included new coating agent in the metering volume 5 of the coating agent metering device 1 are transferred.
  • FIG. 3 shows a further embodiment of a coating agent supply device according to the invention, which partially with the above-described and in FIG. 1 shown embodiment, so that in order to avoid repetition partly to the above description FIG. 1 is referenced.
  • a special feature of this exemplary embodiment is that the coating agent storage container 6 is integrated in the cylinder 2 of the coating agent metering device 1 on the rear side of the metering piston 3.
  • a partition wall 14 is arranged in the cylinder 2, which separates the cylinder 2 into two sub-cylinders, wherein in the right in the drawing part cylinder of the accumulator piston 8 is compressed air actuated displaceable.
  • FIG. 4 shows a modification of the embodiment according to FIG. 3 , so as to avoid repetition, to a large extent to the above description FIG. 3 is referenced.
  • a special feature of this embodiment is that it dispenses with the partition wall 14 for the separation of the two partial cylinders.
  • the compressed air for driving the accumulator piston 8 thus also acts on the back of the metering piston 3, which requires a mechanically sufficiently rigid drive of the metering piston 3.
  • FIGS. 5A to 5J show a painting with a coating agent supply device according to the invention in different phases of a color change, the color change sequence in the flowchart in FIG. 6 is shown and will be described in detail later.
  • the in the FIGS. 5A to 5J The painting system shown has the coating agent storage container 6 and the coating agent dosing device 1, the construction and functioning of which are described above with reference to FIG FIG. 1 has been described.
  • the input side of the coating agent storage container 6 is connected via a valve assembly 15 with a color changer 16, wherein the color changer 16 may be carried out conventionally, as for example in the document DE 103 35 358 A1 is described, so that the content of this document is attributable to the present description in its entirety.
  • the coating agent metering device 1 On the output side, the coating agent metering device 1 is connected via a further valve arrangement 17 with a rotary atomizer 18, wherein from the rotary atomizer 18 a return line 19 goes off, can be rinsed on the remaining coating agent.
  • Another return line 20 is derived from the valve assembly 15, wherein on the return line 20 also remaining coating agent can be removed.
  • FIGS. 5A to 5J described individual phases during a color change described, the fluid-carrying lines are shown in bold in the drawings.
  • FIG. 5A shows first the normal painting operation when the coating agent metering device 1 still with the old coating agent is filled and dosed to the rotary atomizer 18.
  • the rotary atomizer 18 and the coating agent doser 1 are then at a high voltage potential to enable electrostatic component coating.
  • For electrical insulation of the coating agent metering device 1 relative to the coating agent storage container 6 of the insulation tube is then cleaned and emptied, causing a potential separation.
  • the coating agent storage container 6, however, is initially still empty, with only a relatively low pressure of 2 bar is applied to the accumulator piston 8 via the compressed air line 9.
  • the coating agent storage container 6 is therefore already filled with the new coating agent during the painting process.
  • the high voltage on the rotary atomizer 18 and the coating agent metering device 1 is then turned off and the old paint remaining in the coating agent metering device 1 is expressed via the return line 19, which is shown in FIG. 5B is shown.
  • the coating agent dispenser 1 After expressing the old paint remaining in the coating agent dispenser 1, the coating agent dispenser 1 is then rinsed together with the rotary atomizer 18 and the insulation tube 12, which is shown in FIG. 5C is shown.
  • valve assembly 15 then opens the connection between the coating agent storage container 6 and the coating agent metering device 1, so that the coating agent metering device 1 and the main line are pressed with the new color.
  • the ink still contained in the insulation tube 12 is then taken up in the coating agent metering device 1, which is shown in FIG. 5F.
  • This emptying of the insulation tube 12 is important so that the insulation tube 12 can then isolate during the painting operation then lying on high voltage potential coating agent metering 1 electrically relative to the coating agent storage container 6.
  • the coating agent storage container 6 is then rinsed together with the valve arrangement 15 and the color changer 16, in order then to allow a filling with a new color without contamination by paint residues.
  • FIG. 7 shows an alternative embodiment of an operating method according to the invention, which is largely similar to that described above and in FIG. 6 illustrated embodiment, so that reference is made to avoid repetition of the above description.
  • a special feature of this embodiment is that the so-called "reflow" according to FIG. 5I eliminated.
  • no coating agent is pressed back into the coating agent supply line 11 from the coating agent storage container 6.
  • This is made possible by the fact that during the filling of the coating agent storage container 6 according to FIG. 5A, exactly the required amount of ink is filled in, which can be checked by a sensor.
  • This embodiment is particularly suitable for painting with water-based paint and direct charging.
  • FIG. 8 shows an alternative embodiment of an operating method according to the invention, which is largely similar to that described above and in FIG. 6 illustrated embodiment, so that reference is made to avoid repetition of the above description.
  • the painting is done with water paint and external charging and "reflow".
  • the external charging offers over the Direct charging of the coating agent has the advantage that the ventilation of the insulating section 12 (see. FIG. 5G ) can be omitted, since the insulation capacity of the insulating section 12 is required only in a direct charging of the coating composition.
  • FIG. 9 shows an alternative embodiment of an operating method according to the invention, which is largely similar to that described above and in FIG. 6 illustrated embodiment, so that reference is made to avoid repetition of the above description.
  • FIG. 10 shows a simplified representation of a painting robot 21 with a coating agent supply device according to the invention, which largely coincides with the coating agent supply devices described above, so reference is made to avoid repetition of the above description.
  • the coating agent metering device 1 is embodied here as a piston dispenser and integrated into an atomizer 22, which is mounted on a hand axis 23 and is guided by a highly mobile robot arm 24.
  • the coating agent storage container 6 is arranged stationarily outside the painting robot 21 and can be connected to the coating agent metering device 1 via the docking interface 13.
  • the painting robot 21 moves the atomizer 22 so that the docking interface 13 docks on the coating agent storage container 6, after which the coating agent metering device 1 can be filled from the coating agent storage container 6.
  • the drawing shows an alternative variant in which the dashed line coating agent metering 1 is integrated into the robot arm 24.
  • FIG. 11 painting robot 21 shown partially in accordance with the above-described and in FIG. 10 shown painting robot 21, so that reference is made to avoid repetition of the above description, wherein the same reference numerals are used for corresponding components.
  • the coating agent metering device 1, the coating agent storage container 6 and a color changer 25 are integrated into the robot arm 24, wherein the color changer 25 without an insulating section directly to the front of the coating agent storage container 6 and the coating agent metering device 1 is grown.
  • the painting robot 21 is used in this embodiment for the application of a high-resistance 1-component solvent-based paint with an electrical direct charging of the paint or for painting without high voltage (pure high-rotation sputtering).
  • FIG. 12 shown painting robot 21 is largely consistent with that described above and in FIG. 11 shown painting robot 21, so that reference is made to avoid repetition of the above description, wherein the same reference numerals are used for corresponding components.
  • a special feature of the painting robot 21 is that 2-component solvent-based paint is applied with direct electrical charging, wherein the one coating component is metered by the coating agent metering device 1, while the other paint component is metered by a piston dispenser 26 via a hose line 27.
  • the additional piston dispenser 26 is in this case arranged stationarily outside the painting robot 21.
  • FIG. 13 shows a simplified representation of an insulating section 28, instead of in the Figures 5A-5J shown insulation tube 12 can be used.
  • the insulating section 28 consists essentially of an electrically non-conductive tube 29 which extends between the two valve assemblies 15 and 17.
  • a Abstreifkolben 30 is linearly displaceable, wherein the drive of the Abstreifkolbens 30 is effected by a piston rod 31, at the end of a drive piston 32 is fixed.
  • the drive piston 32 is slidably guided in a pressure cylinder 33, wherein in the pressure cylinder 33 on both sides of the drive piston 32 two compressed-air ports 34, 35 open, via which the drive piston 32 can be pressurized on one side with compressed air to the drive piston 32 with the piston rod 31 and the Abstreifkolben 30 to move.
  • the displacement of the stripping piston 3 serves to scrape coating agent residues on the inner wall of the tube 29 in order to achieve the desired electrical insulation capacity of the insulating section.
  • the stripping off of the color residues from the inner wall of the tube 29 during a color change prevents contamination by residual color.
  • the coating agent is thereby transferred in the earthed state via an inlet A and an outlet B, wherein the stripping piston 30 is in its rest position, the in FIG. 13 is shown.
  • the coating agent remaining in the tube 29 is then pushed out of the tube 29 by the advancing stripping piston 30.
  • the piston rod 31 is made of an electrically conductive material, the piston rod 31 is then withdrawn from the tube 29 before switching on the electrical voltage for the coating agent charging.
  • the piston rod 31 is made of an electrically insulating material, the piston rod 31 remains in the advanced state when the voltage is turned on and is pulled back only after the voltage has been switched off. This is advantageous because the retraction of the stripping piston 30 can lead to streaking on the inner wall of the tube 29, whereby the insulation capacity is impaired.
  • FIG. 14 shows an alternative embodiment of an insulating section, which is largely with the above-described and in FIG. 13 illustrated embodiment, so reference is made to avoid repetition of the above description, wherein the same reference numerals are used for corresponding components.
  • a peculiarity of this embodiment is that the stripping piston 30 is not fixedly connected to the piston rod 31, so that the piston rod 31 can push the stripping piston 30 in one direction only, i. in the drawing to the left.
  • FIG. 15 shows an alternative embodiment of an insulating section, which is largely with the above-described and in FIG. 14 illustrated embodiment, so reference is made to avoid repetition of the above description, wherein the same reference numerals are used for corresponding components.
  • a special feature of this embodiment is that the stripping piston 30 is pneumatically driven in both directions, for which purpose an additional compressed air port 37 opens into the tube, so that the drive piston 30 can be acted upon on both sides with compressed air. This offers the advantage that it is possible to dispense with the piston rod 31 for driving the stripping piston 30.
  • FIGS. 16A and 16B show a further variant of the invention, which can be used in a paint shop with a loop system, as known for example from Pavel Svejda: "Processes and Application Methods" (Vincentz Verlag), page 106 ff., So that in the following a detailed description of loop systems can be dispensed with.
  • a ring line 38 in this case two controllable shut-off valves 39, 40 are arranged in the flow direction, which in the closed state a portion of the ring line 38 between the two shut-off valves 39, 40 separated from the rest of the ring line 38, wherein the isolated portion of the ring line 38 between the two shut-off valves 39, 40 forms a coating agent storage container in the sense according to the invention, as will be described in detail.
  • a removal point 41 can be removed from the ring line 38 via the coating means, wherein the removal point 41 has an automatically operating Andockventil 42.
  • a painting machine 43 can dock on the removal point 41, wherein the painting machine 43 is shown here only schematically and contains a coating agent metering device 44, which is also shown only schematically in order to explain the principle of the invention in this variant.
  • the docking valve 42 opens automatically when the varnishing machine 43 is docked to the removal point 41, so that the varnishing machine 43 can remove the coating agent from the ring line 38.
  • the docking valve 42 closes against it independently, to prevent the coating agent from escaping from the loop 38.
  • the ring line 38 is formed by a so-called squeeze-out tube 45, wherein the structure and operation of the squeeze-out tube 45, for example, in WO 03/086671 A1 and DE 10 2004 016 951 A1 is described.
  • the squeeze-out tube 45 has a flexible inner tube 46 through which the coating agent flows.
  • the inner tube 46 of the squeeze-out tube 45 is surrounded on the outside by a rigid outer jacket 47, wherein a sealed annular space 48 is located between the outer jacket 47 and the flexible inner tube 46 of the squeeze-out tube 45.
  • annular space 48 opens via a controllable inlet valve 49, an inlet 50, can be introduced via the compressed air or other pressure medium in the annular space 48 between the outer jacket 47 and the flexible inner tube 46.
  • an outlet 52 via which the compressed gas can be discharged from the annular space 48 in order to end the compression of the inner tube 46.
  • FIG. 16A shows a state in which the painting machine 43 is undocked from the removal point 41 while Figure 16B shows a state in which the coating machine 43 is docked at the removal point 41 and coating agent is transferred via the removal point 41 in the coating agent metering device 44 of the coating machine 43.
  • the docking valve 42 of the removal point 41 is also closed in this state, since the coating machine 43 is not docked to the removal point 41.
  • the two shut-off valves 39, 40 of the ring line 38 are then closed so that the squeeze-out tube 45 with the filled inner tube 46 is isolated from the rest of the ring line 38.
  • the painting machine 43 can dock on the removal point 41, whereupon the docking valve 42 opens automatically.
  • the outlet valve 51 of the squeeze-out tube 45 is then closed, while the inlet valve 49 is opened.
  • compressed air is introduced into the annulus 48 between the outer shell 47 and the inner tube 46, whereby the flexible inner tube 46 is compressed in the radial direction, as in Figure 16B is shown.
  • the compression of the inner tube 46 begins in this case Drawing on the right side and propagates in the form of a peristaltic movement in the drawing to the left, so that the coating material contained in the flexible inner tube 46 is pumped via the removal point 41 into the coating agent metering device 44.
  • the squeeze-out tube 45 forms the coating agent storage container according to the invention.

Landscapes

  • Spray Control Apparatus (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP14002527.1A 2005-10-07 2006-10-06 Dispositif d'alimentation pour un agent de revêtement et correspondant procédé de fonctionnement Revoked EP2810719B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102005048223A DE102005048223A1 (de) 2005-10-07 2005-10-07 Beschichtungsmittel-Versorgungseinrichtung und zugehöriges Betriebsverfahren
DE102005060959A DE102005060959A1 (de) 2005-10-07 2005-12-20 Beschichtungsmittel-Versorgungseinrichtung und zugehöriges Betriebsverfahren
EP06021045.7A EP1772194B1 (fr) 2005-10-07 2006-10-06 Dispositif d'alimentation pour un agent de revêtement et correspondant procédé de fonctionnement

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EP06021045.7A Division EP1772194B1 (fr) 2005-10-07 2006-10-06 Dispositif d'alimentation pour un agent de revêtement et correspondant procédé de fonctionnement
EP06021045.7A Division-Into EP1772194B1 (fr) 2005-10-07 2006-10-06 Dispositif d'alimentation pour un agent de revêtement et correspondant procédé de fonctionnement

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EP2810719B1 EP2810719B1 (fr) 2018-06-20

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DE102007029195A1 (de) 2007-06-25 2009-02-19 Dürr Systems GmbH Beschichtungseinrichtung mit einer Dosiervorrichtung
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DE102020104325A1 (de) * 2020-02-19 2021-08-19 Dürr Systems Ag Spülvorrichtung zum Verbinden mit einem Applikationsmittel-Hauptkanal eines Applikationsmittelwechslers

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ES2717116T3 (es) 2019-06-19
DE202006021283U1 (de) 2014-08-27
EP2810719B1 (fr) 2018-06-20
ES2685244T3 (es) 2018-10-08
EP1772194A2 (fr) 2007-04-11
EP1772194A3 (fr) 2008-09-17
HUE043560T2 (hu) 2019-08-28
EP1772194B1 (fr) 2019-01-09

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