EP3698880A1 - Tête d'impression pour appliquer un moyen de revêtement - Google Patents

Tête d'impression pour appliquer un moyen de revêtement Download PDF

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Publication number
EP3698880A1
EP3698880A1 EP20170281.8A EP20170281A EP3698880A1 EP 3698880 A1 EP3698880 A1 EP 3698880A1 EP 20170281 A EP20170281 A EP 20170281A EP 3698880 A1 EP3698880 A1 EP 3698880A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
valve element
print head
closed position
seal
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
EP20170281.8A
Other languages
German (de)
English (en)
Other versions
EP3698880B1 (fr
Inventor
Hans-Georg Fritz
Benjamin WÖHR
Marcus Kleiner
Moritz BUBEK
Timo Beyl
Frank Herre
Steffen Sotzny
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
Application filed by Duerr Systems AG filed Critical Duerr Systems AG
Publication of EP3698880A1 publication Critical patent/EP3698880A1/fr
Application granted granted Critical
Publication of EP3698880B1 publication Critical patent/EP3698880B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status 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
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/3073—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a deflector acting as a valve in co-operation with the outlet orifice
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • B05B1/3053—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice the actuating means being a solenoid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • B05B1/306—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice the actuating means being a fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/32—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages in which a valve member forms part of the outlet opening
    • 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
    • B05B13/0447—Installation or apparatus for applying liquid or other fluent material to conveyed separate articles
    • B05B13/0452—Installation or apparatus for applying liquid or other fluent material to conveyed separate articles the conveyed articles being vehicle bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves
    • B05C11/1026—Valves
    • B05C11/1028—Lift valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0225—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work characterised by flow controlling means, e.g. valves, located proximate the outlet
    • B05C5/0237—Fluid actuated valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/027—Coating heads with several outlets, e.g. aligned transversally to the moving direction of a web to be coated
    • B05C5/0275—Coating heads with several outlets, e.g. aligned transversally to the moving direction of a web to be coated flow controlled, e.g. by a valve
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0291—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work the material being discharged on the work through discrete orifices as discrete droplets, beads or strips that coalesce on the work or are spread on the work so as to form a continuous coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/05—Heads having a valve

Definitions

  • the invention relates to a print head for applying a coating agent to a component, in particular for applying a paint to a motor vehicle body component.
  • rotary atomizers are usually used as the application device, but they have the disadvantage of a limited application efficiency, i.e. only part of the applied paint is deposited on the components to be coated, while the rest of the applied paint has to be disposed of as so-called overspray.
  • print heads as application devices, as they are, for example DE 10 2013 002 412 A1 , US 9,108,424 B2 and DE 10 2010 019 612 A1 are known.
  • print heads do not emit a spray mist of the paint to be applied, but a spatially narrowly limited paint jet that is almost completely reflected on the component to be painted, so that almost no overspray occurs.
  • nozzles are usually arranged in a nozzle plate of the print head, and the individual nozzles can each be released or closed by a movable valve element.
  • the movable valve element is usually a valve needle with an elastomer insert as a seal.
  • the valve needle with the elastomer insert is here displaceable between a closed position and an open position, the elastomer insert sealing the nozzle in the closed position of the valve needle, whereas the elastomer insert is lifted from the nozzle in the open position and thereby releases the fluid flow (mostly ink according to the prior art) through the nozzle.
  • valve needle with the elastomer insert can only be miniaturized within certain limits, so that the nozzle spacing between the adjacent nozzles cannot fall below a lower limit.
  • the invention is therefore based on the object of creating another solution for sealing the movable valve element with respect to the nozzle.
  • print head used in the context of the invention is to be understood in general terms and only serves to differentiate between atomizers (e.g. rotary atomizers, disc atomizers, airless atomizers, airmix atomizers, ultrasonic atomizers) that spray the coating agent to be applied submit.
  • atomizers e.g. rotary atomizers, disc atomizers, airless atomizers, airmix atomizers, ultrasonic atomizers
  • the print head according to the invention emits a spatially narrowly limited coating agent jet.
  • Such print heads are known per se from the prior art and, for example, in DE 10 2013 092 412 A1 , US 9,108,424 B2 and DE 10 2010 019 612 A1 described.
  • the pressure head according to the invention is preferably used to apply a lacquer (e.g. basecoat, clear lacquer, water-based lacquer, solvent-based lacquer).
  • a lacquer e.g. basecoat, clear lacquer, water-based lacquer, solvent-based lacquer
  • the print head according to the invention can alternatively also be designed for the application of other coating agents, such as, for example, for the application of sealant, insulating material, adhesive, primer, etc., to name just a few examples.
  • the printhead according to the invention has a nozzle plate which contains at least one nozzle for dispensing the coating agent.
  • This nozzle preferably emits the aforementioned jet of coating agent onto the component to be coated.
  • the nozzle is arranged inside the print head and the coating agent only passes on to the outer outlet nozzle, which then applies the coating agent jet to the component.
  • the printhead according to the invention in accordance with the prior art, has a valve element in order to control the release of coating agent through the nozzle.
  • This valve element is movable relative to the nozzle plate, the valve element closing the nozzle in a closed position, whereas the movable valve element releases the nozzle in an open position.
  • the movement of the valve element between the closed position and the open position is preferably a purely linear movement (displacement movement), but in principle there is also the possibility of other movements of the valve element between the open position and the closed position within the scope of the invention.
  • a rotary movement, a pivoting movement or a combined rotary and linear movement of the valve element is to be mentioned merely as an example.
  • the print head according to the invention comprises a seal for sealing the nozzle against the movable valve element in the closed position of the valve element.
  • this seal is preferably not designed as an elastomer insert on the valve element, since this is associated with the problems described above.
  • the seal can be arranged on the nozzle plate, ie not on the movable valve element, as is the case with the known elastomer inserts.
  • the seal according to the invention is attached to the movable valve element, ie not to the nozzle plate.
  • a seal being attached both to the movable valve element and to the nozzle plate, in this case the nozzle, the two seals then interacting.
  • the seal is preferably flat and, in the closed position, causes flat contact between the movable valve element and the seal.
  • flat sealing plates or sealing layers can be applied to the inside of the nozzle plate for this purpose.
  • the shape of the movable valve element is complementarily adapted to the shape of the nozzle and, in the closed position, protrudes into the nozzle.
  • the nozzle can narrow conically in the direction of flow.
  • the movable valve element should then also taper conically towards its free end, preferably with the same cone angle as the nozzle, so that the valve element and the nozzle then form a corresponding shape fit, whereby the sealing effect is improved.
  • the nozzle has a hemispherical inner contour, so that the movable valve element then preferably also has a hemispherical outer contour.
  • the seal can be applied to the inner flanks of the nozzle.
  • the seal then preferably covers the inner flanks of the nozzle.
  • the print head has a flexible sealing membrane, the flexible sealing membrane forming the movable valve element and closing the nozzle in its closed position and releasing it in its open position.
  • This sealing membrane is deflected between the closed position and the open position by a valve drive.
  • the flexible sealing membrane thus a seal of the nozzle in the closed position.
  • the sealing membrane also separates the coating agent feed from the valve drive so that the valve drive does not come into contact with the coating agent. This is particularly advantageous when coating agents of different colors are to be applied one after the other and the print head must therefore be rinsed with a rinsing agent.
  • the flexible sealing membrane namely prevents coating agent deposits in the valve drive and, due to its smooth surface, also enables good flushability.
  • the sealing membrane can also be designed to be elastic and then fulfill the function of a return spring which presses the sealing membrane into its rest position, in particular into the closed position.
  • the valve drive then preferably deflects the sealing membrane into the open position, whereas the sealing membrane, due to its spring elasticity, is pressed into the closed position without being activated by the valve drive.
  • the sealing membrane is pressed into the open position due to its resilience, the valve drive then pushing the sealing membrane into the closed position.
  • the pressure head preferably has a valve drive.
  • the valve drive comprises a flexible drive membrane which is mechanically coupled to the movable valve element and can be supplied with a drive fluid (e.g. hydraulic fluid, compressed air) in order to deflect the drive membrane and thereby move the valve element.
  • a drive fluid e.g. hydraulic fluid, compressed air
  • the drive membrane is acted upon by the coating agent itself.
  • the drive fluid can consist of part of the paint, e.g. Binder, solvent, Mesamol TM or similar. If the membrane breaks, this would not represent any chemical reactions or incompatibilities.
  • valve drive is particularly advantageous in combination with the flexible sealing membrane mentioned above, since two seals are then present between the nozzle and the drive fluid, namely on the one hand the seal through the drive membrane and on the other hand the seal through the flexible sealing membrane. In this way, an escape of the drive fluid (e.g. hydraulic fluid) through the nozzle can be prevented with double security.
  • the drive fluid e.g. hydraulic fluid
  • valve drive can be designed as a magnetic actuator with a coil and a displaceable armature in the coil, the armature being mechanically coupled to the moving valve element and being displaced between the open position and the closed position depending on the energization of the coil.
  • the valve element for example, the plunger
  • the valve drive In the closed position, the valve drive then preferably does not exert any force on the nozzle plate, so that the nozzle plate is flat and rests in a sealing manner with the nozzle on the free end of the movable valve element (eg the tappet).
  • Bends in the open position the valve drive on the other hand, the nozzle plate, so that the nozzle is lifted from the free end of the valve element with a certain stroke so that the coating agent can emerge from the nozzle.
  • the stroke of the nozzle plate in the area of the nozzle is preferably approximately 30 pm between the closed position and the open position.
  • the seal can be flat.
  • the seal can have a sealant layer which is vulcanized, vapor-deposited, applied by a layer-forming process, or printed onto the nozzle plate, for example.
  • the seal has a film that can be glued, placed, bonded or laminated onto the nozzle plate, for example.
  • the movable element is preferably at least partially made of metal, plastic or silicon.
  • the movable valve element can for example consist of metal and be combined with a valve stem made of plastic.
  • the nozzle can consist of silicon or contain a nozzle insert made of silicon, while the movable valve element consists at least partially of steel, rubber or plastic (e.g. PTFE: polytetrafluoroethylene).
  • PTFE polytetrafluoroethylene
  • the seal When the movable valve element is moved from the open position into the closed position, the seal generally also forms a mechanical stop which limits the movement of the valve element into the closed position.
  • the seal here has two functions, namely on the one hand the actual sealing function and on the other hand the function of a mechanical stop.
  • a separate mechanical stop is provided in order to limit the movement of the valve element into the closed position. This can be advantageous because a defined compression force acts on the seal.
  • the mechanical stop here preferably has a material pairing between the side of the valve element and the side of the nozzle which provides metal on both sides.
  • the seal is preferably elastic and, in the closed position, experiences a certain material compression which is defined by the mechanical stop.
  • the movable valve element is preferably designed as a valve plate which can be displaced by the valve drive via a tappet between the open position and the closed position.
  • the plunger protrudes through the nozzle and, in the closed position, the valve plate rests on the underside of the nozzle plate facing away from the valve drive.
  • the valve plate is pulled into the nozzle to close the nozzle, whereas the nozzle plate is pushed out of the nozzle to open the nozzle.
  • a nozzle channel runs in the nozzle plate, from which at least one nozzle is fed. In its closed position, the plate-shaped valve element rests in a sealing manner on the upper side of the nozzle channel facing the valve drive.
  • the print head preferably emits a narrowly limited jet of coating agent in contrast to a spray mist such as is emitted by conventional atomizers (e.g. rotary atomizers).
  • atomizers e.g. rotary atomizers
  • the print head can emit a jet of droplets in contrast to a jet of coating agent that is contiguous in the longitudinal direction of the jet.
  • the print head emits a coating agent jet that is contiguous in the longitudinal direction of the jet, in contrast to a jet of droplets.
  • a potential separation system may have to be used in the material supply when processing conductive paints.
  • all components of the applicator must be designed to be high-voltage resistant.
  • a particular advantage of the printhead according to the invention is the fact that it works almost without overspray, i. E. the print head preferably has an application efficiency of at least 80%, 90%, 95% or 99%, so that essentially all of the applied coating agent is completely deposited on the component without overspray occurring.
  • the print head preferably has a high surface coating capacity so that the print head is also suitable for surface coating in the series painting of motor vehicle body components. Therefore, the print head preferably has a surface coating performance of at least 0.5 m 2 / min, 1m 2 / min, 2m 2 / min or even 3m 2 / min.
  • the invention not only claims protection for the above-described printhead according to the invention as a single component. Rather, the invention also claims protection for a complete coating system (for example painting system) for painting components (for example motor vehicle body components), a print head according to the invention being used as the application device.
  • a complete coating system for example painting system
  • painting components for example motor vehicle body components
  • the print head according to the invention can be guided by a multi-axis painting robot which preferably has serial kinematics with at least six movable robot axes.
  • FIG. 1 shows a schematic representation of a control valve in a print head according to the invention for paint application in a paint shop for painting motor vehicle body components, the print head being moved by a multi-axis painting robot with serial robot kinematics with at least six robot axes, as is known from the prior art is known and therefore does not need to be described in more detail.
  • the print head according to the invention has a nozzle plate 1 with a plurality of nozzles 2, only a single nozzle 2 being shown here for the sake of simplicity.
  • the paint to be painted is fed from a paint feed 3 in the print head, the paint feed 3 being delimited by the nozzle plate 1 at the bottom and by a further plate 4 at the top.
  • the upper plate 4 has an opening coaxially to the nozzle 2 in the nozzle plate 1, onto which a coil tube 5 is placed coaxially, the coil tube 5 being wound with a coil 6.
  • the coil tube 5 there is a coil core 7 which is sealed off from the coil tube 5 at the upper end of the coil tube 5 by a seal 8.
  • the drawing shows the armature 9 in a lower closed position in order to seal the nozzle 2.
  • the coil 6 is energized so that the armature 9 is pulled up in the drawing to release the nozzle 2.
  • control valve has a return spring 10 which presses the armature 9 into the closed position shown in the drawing without the coil 6 being energized.
  • the armature 9 At its free end, the armature 9 carries a seal 11 in order to seal the nozzle 2 in the closed position.
  • the flat seal 12 on the inside of the nozzle plate can consist, for example, of a layer of sealant that is vulcanized, vapor-deposited, applied or printed on the inside of the nozzle plate 1 by a layer-forming process.
  • the seal 12 is a film which is placed, glued or laminated on the inside of the nozzle plate 1.
  • the material pairings of the seal 11 on the one hand and the seal 12 on the other hand can be considered as material pairing.
  • metal on metal, plastic on metal, metal on plastic, plastic on silicon, silicon on silicon or metal on silicon can be considered as material pairing.
  • FIG. 2 shows a modification of the embodiment according to Figure 1 so that to avoid repetition, reference is made to the above description, the same reference symbols being used for corresponding details.
  • a special feature of this exemplary embodiment is that the nozzle 2 tapers conically in the inlet area in the direction of flow and has lateral nozzle flanks.
  • the seal 12 is therefore applied to the lateral nozzle flanks of the nozzle 2.
  • the seal 11 is adapted to this shape of the nozzle and therefore tapers conically towards its free end, so that the seal 11 on the one hand and the nozzle 2 on the other hand are adapted in shape, which leads to a good sealing effect.
  • FIG. 3 shows a further modification of the exemplary embodiments described above, so that reference is again made to the preceding description to avoid repetition.
  • a special feature of this embodiment is a flexible sealing membrane 13 instead of the seal 11.
  • the drawing shows the open position in which the armature 9 is lifted upwards and the sealing membrane 13 releases the nozzle.
  • the coil 6 is de-energized, so that the armature 9 is pressed down by the return spring 10 in the drawing until the sealing membrane 13 rests on the inner mouth opening of the nozzle 2 in the nozzle plate 1 and thereby the nozzle 2 locks.
  • the sealing membrane 13 here not only has the function of opening or closing the nozzle 2. Rather, the sealing membrane 13 also creates a seal between the paint supply 3 and the other components of the control valve, such as the armature 9, the coil tube 5 and the coil core 7. This is advantageous because it prevents paint deposits in the control valve and in particular in the coil tube 5 become. This is particularly important when changing the color, because it means that the control valve itself does not have to be flushed because it does not come into contact with the paint at all.
  • Figure 4 shows a modification of the embodiment according to Figure 3 so that reference is made to the description above to avoid repetition.
  • valve drive which is not - as in Figure 3 - works electromagnetically, but hydraulically.
  • the valve drive has a separate drive membrane 14, which can be acted upon by a hydraulic fluid as drive fluid via a hydraulic connection 15, around the drive membrane 14 and thus also the sealing membrane 13 to be able to move with the attached seal 11 in the direction of the double arrow.
  • Figure 5 shows a modification of the embodiment according to Figure 1 so that reference is made to the description above to avoid repetition.
  • a special feature of this embodiment is first of all that the return spring 10 has been dispensed with, i.e. the movement of the armature 9 is controlled both in the closed position and in the open position solely by energizing the coil 6.
  • the armature 9 is connected via a tappet 16 to a valve plate 17, which is displaceable in a nozzle channel 18 in the direction of the double arrow.
  • the drawing shows the position of the valve plate 17 in the closed position, in which the valve plate 17 rests against the upper side of the nozzle channel 18 and thereby seals the nozzle 2.
  • the plunger 16 with the valve plate 17 is pressed downward in the drawing and then no longer rests against the upper wall of the nozzle channel 18. The paint can then enter the nozzle channel 18 from the paint feed and flow out through the nozzle 2.
  • Figure 6 shows a modification of the embodiment according to Figure 5 so that reference is made to the description above to avoid repetition.
  • a special feature of this exemplary embodiment is that no nozzle channel 18 is arranged in the nozzle plate 1. Rather, in the closed position shown in the drawing, the valve plate 17 lies sealingly against the outside of the nozzle plate 1 in a recess.
  • FIGS 7A and 7B show another concept for opening or closing the nozzle 2.
  • Figure 7A shows Figure 7A a closed position while Figure 7B shows an open position in which the nozzle 2 is released.
  • the nozzle 2 is either sealed or released by a stationary plunger 19.
  • the nozzle plate 1 is either not bent ( Figure 7A ) or so bent ( Figure 7B ) that the nozzle plate 1 is lifted off the stationary plunger 19 in the area of the nozzle 2. It is sufficient here if the nozzle plate 1 executes a bending-related stroke of, for example, 30pm in the area of the nozzle 2.
  • FIGs 8A-8C show various possible contours of nozzle 2, namely a cylindrical contour ( Figure 8A ), a conical contour ( Figure 8B ) and a contour with an elevation 20 on the outlet side of the nozzle 2 ( Figure 8C ).
  • the invention is not restricted to the preferred exemplary embodiments described above. Rather, a large number of variants and modifications are possible which also make use of the inventive concept and therefore fall within the scope of protection.
  • the invention also claims protection for the object and the features of Subclaims independent of the claims referred to in each case and in particular also without the features of the main claim.
  • the invention thus comprises various aspects of the invention that are protected independently of one another.
  • the invention also includes print head variants in which no plastic valve tappet is provided.

Landscapes

  • Coating Apparatus (AREA)
  • Spray Control Apparatus (AREA)
  • Nozzles (AREA)
EP20170281.8A 2016-12-14 2017-12-01 Tête d'impression pour appliquer un moyen de revêtement Active EP3698880B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102016014947.7A DE102016014947A1 (de) 2016-12-14 2016-12-14 Druckkopf zur Applikation eines Beschichtungsmittels
EP17807873.9A EP3554712B1 (fr) 2016-12-14 2017-12-01 Tete d'impression pour appliquer un produit de revêtement
PCT/EP2017/081141 WO2018108576A1 (fr) 2016-12-14 2017-12-01 Tête d'impression pour l'application d'un agent de revêtement

Related Parent Applications (2)

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EP17807873.9A Division-Into EP3554712B1 (fr) 2016-12-14 2017-12-01 Tete d'impression pour appliquer un produit de revêtement
EP17807873.9A Division EP3554712B1 (fr) 2016-12-14 2017-12-01 Tete d'impression pour appliquer un produit de revêtement

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EP3698880A1 true EP3698880A1 (fr) 2020-08-26
EP3698880B1 EP3698880B1 (fr) 2022-05-04

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EP (2) EP3554712B1 (fr)
JP (1) JP6983886B2 (fr)
KR (2) KR102686001B1 (fr)
CN (1) CN110072626B (fr)
DE (1) DE102016014947A1 (fr)
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US20190336990A1 (en) 2019-11-07
ES2812302T3 (es) 2021-03-16
WO2018108576A1 (fr) 2018-06-21
EP3698880B1 (fr) 2022-05-04
KR102686001B1 (ko) 2024-07-19
KR20190095256A (ko) 2019-08-14
DE102016014947A1 (de) 2018-06-14
KR20230028578A (ko) 2023-02-28
EP3554712A1 (fr) 2019-10-23
MX2019006975A (es) 2019-08-16
JP2020501877A (ja) 2020-01-23
JP6983886B2 (ja) 2021-12-17
US11167297B2 (en) 2021-11-09
CN110072626A (zh) 2019-07-30
CN110072626B (zh) 2022-05-31

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