EP1393817B1 - Device for applying coating material - Google Patents

Device for applying coating material Download PDF

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Publication number
EP1393817B1
EP1393817B1 EP03019218A EP03019218A EP1393817B1 EP 1393817 B1 EP1393817 B1 EP 1393817B1 EP 03019218 A EP03019218 A EP 03019218A EP 03019218 A EP03019218 A EP 03019218A EP 1393817 B1 EP1393817 B1 EP 1393817B1
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EP
European Patent Office
Prior art keywords
accordance
controller
spray
substrate
nozzle opening
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.)
Expired - Lifetime
Application number
EP03019218A
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German (de)
French (fr)
Other versions
EP1393817A2 (en
EP1393817A3 (en
Inventor
Leonhard Kistler
Robert Vögel
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Amtec Kistler GmbH
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Amtec Kistler GmbH
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Publication date
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Publication of EP1393817A2 publication Critical patent/EP1393817A2/en
Publication of EP1393817A3 publication Critical patent/EP1393817A3/en
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Publication of EP1393817B1 publication Critical patent/EP1393817B1/en
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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
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/10—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to temperature or viscosity of liquid or other fluent material discharged
    • 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
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/085—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to flow or pressure of liquid or other fluent material to be discharged
    • 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
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/12—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus
    • B05B12/122—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus responsive to presence or shape of target
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
    • B05B7/066—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
    • B05B7/1693—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed with means for heating the material to be sprayed or an atomizing fluid in a supply hose or the like

Definitions

  • the invention relates to a device for applying a coating agent to a substrate, in particular for applying a lubricant to a deep-drawing press fed sheet, with at least one by means of a closure member which is positionable by means of an associated positioning, with respect to their effective exit surface variable nozzle opening having spray valve, where the substrate can be moved past and to which the coating agent can be supplied with pressure via a supply line
  • Such an arrangement is in the DE 101 39 633 C1 specified.
  • the arrangement described herein serves to produce a constant layer thickness of the lubricant on the sheet fed to a deep drawing press which is accelerated and decelerated during the feeding operation.
  • the closure member associated with its opening movement limiting fixed stop which is designed as a rotatable cam having the dependence of between the speed of the substrate and the required for a constant layer thickness outflow rate of the coating agent or the associated position of the closure member following contour and the is rotatable and is rotated so that its current speed of the substrate associated peripheral portion is effective as a stop
  • the desired layer thickness can be achieved hereby.
  • Disturbance variables such as a contamination present in the region of the nozzle opening, a change in the viscosity of the Coating agent and the like, however, can lead to inaccuracies. It can therefore come to a lack of lubricant, resulting in damage to the thermoformed molding during the thermoforming process and thus the production of rejects. In long-term operation, therefore, frequent, preventive maintenance with short maintenance intervals is required to prevent such hazards.
  • Another disadvantage is the fact that even with a proper function, only the constant layer thickness can be generated. However, this must be based on the maximum requirement existing only in some places, which leads to an unnecessarily high consumption of coating agent.
  • the WO 02/43878 A teaches a device for the controlled application of adhesives and sealants on support materials containing as essential components a reservoir for at least one adhesive and / or sealant, a feed pump, a gun with at least one application nozzle, a flow sensor and a control unit with associated data processing program contains.
  • the storage container, the feed pump and the Auftzagskopf with at least one application nozzle are connected by a the adhesive and / or sealant leading pipe system.
  • the volume flow sensor and the control unit with associated data processing program are connected to each other via a pulse transmission line.
  • the control unit with associated data processing program, the feed pump and the gun are connected via control lines.
  • the device is intended to enable a precise and constant application of a predetermined amount of adhesive and / or sealant in an industrial manufacturing environment.
  • the structure of the application nozzle is not specified.
  • the adjustment of the flow of the substance to be applied is done via a control of the feed pump.
  • the object of the present invention is to improve a device of the type mentioned above with simple and inexpensive means so that despite a low Warrungsaufwands even in long-term operation, a high accuracy is guaranteed
  • this object is achieved in that the closure member is permanently adjustable within a predetermined setting field by means of the associated positioning device, wherein a regulator is associated with the positioning device, the at least one setpoint input for the currently required outflow rate of the coating agent from the spray valve and at least one actual value Input for the mass flow rate in has a supply section upstream of the nozzle opening and which forms from the control deviation a positioning signal influencing the positioning in the sense of abolishing the control deviation, and that the position of the substrate within its path passing through the spray valve can be detected by means of a path measuring device whose output at the input of a trained as a computer Setpoint adjuster is located in which the desired layer thickness is stored in the form of a layer extending over the length of the substrate in the transport direction of the substrate thickness profile and the instantaneous value of the position of the substrate and the position associated layer thickness is the setpoint for the outflow rate, the beginning the distance measurement can be activated by the substrate
  • the regulation according to the invention advantageously comprises all parameters influencing the outflow rate.
  • the cascade control advantageously also takes into account the speed of the substrate via the displacement measurement, so that a high accuracy is achieved even with a desired layer thickness profile. The influence of disturbances is therefore eliminated in an advantageous manner. This allows long service intervals and still ensures high accuracy in long-term operation. The production of unusable parts as a result of a faulty coating can thus be largely prevented in an advantageous manner.
  • a further advantageous measure may consist in that the controller has an additional setpoint input for the desired temperature of the coating agent and an additional actual value input for the temperature in a supply section upstream of the nozzle opening and from the control deviation a control signal for setting a one of the Nozzle opening upstream supply section associated heating device forms.
  • the supply line supplying the spray valve with coating agent can be provided with a Venturi lid, which is associated with a pressure compensator.
  • a display and / or recording device for displaying and / or recording the control deviation can be provided. This measure allows easy control and facilitates troubleshooting later.
  • the controller may be integrated into the associated spray valve. This results in a simple and compact design, eliminating the need for peripheral cabling.
  • a further advantageous embodiment of the higher-level measures may be that over the width of the substrate several, each controllable by a regulator spray valves are provided and that the regulator of all spray valves are connected to a common setpoint adjuster, in which the layer thickness profiles of the spray valves associated zones of the Are stored substrate and the setpoints for all spray valves, wherein advantageously a data bus can be provided between the setpoint adjuster and the regulators of the spray valves.
  • Main field of application of the present invention is the thermoforming of sheets.
  • the sheets supplied to the deep-drawing press are coated with a lubricant, usually oil. This coating is usually done on both sides. Because the However, sheets are not exposed to a sliding movement on its entire surface, a need-based distribution of the lubricant on the surface of the sheet to be formed is desired to save lubricant.
  • the material to be shaped by means of the deep-drawing press ie the substrate, is supplied to the deep-drawing press either in the form of metal sheets or in the form of an endless belt.
  • the arrangement according to FIG. 1 is based on the processing of metal sheets 1. These are successively spaced at a uniform distance on a here designed as a conveyor belt, not shown deep drawing press associated feed device 2, which is driven by a drive device 3. At each cycle of the deep-drawing press a metal sheet 1 is transformed. The panels must therefore be fed in time to the deep drawing press. The same goes for an endless band, of course.
  • the material to be subjected to a deep-drawing process is usually, as already mentioned, coated on both sides with a lubricant. To simplify the illustration is in FIG. 1 however, only one coating is shown from above. A similar device may be provided for the bottom coating.
  • the coating device shown contains a plurality of, over the width of the substrate to be coated, so here the metal sheet 1, arranged spray valves 4. These each contain, as best of FIG. 2 It can be seen, a spray head 4a with a storage chamber 5, in which the lubricant used, in the example shown oil, under pressure and from the one conically narrowing to its output nozzle opening 6 goes off, the effective opening cross section by means of an adjustable closure member 7 is changeable , To form the closure member 7, a nozzle needle engaging into the nozzle opening 6 with a conical tip is provided here, which by means of a suitably designed as a linear motor drive means 8 within its Einstellfeldes, which includes all positions between fully closed and fully open, is movable in the axial direction.
  • a spray head 4a with a storage chamber 5 in which the lubricant used, in the example shown oil, under pressure and from the one conically narrowing to its output nozzle opening 6 goes off, the effective opening cross section by means of an adjustable closure member 7 is changeable
  • the above-mentioned linear motor can be designed as a lifting magnet, which is connected via a supply loop 9 with a power source, in the example shown with the power grid 10.
  • a supply line 11 In the storage chamber 5 opens a supply line 11 through which the lubricant is fed with the desired pressure in the storage chamber 5.
  • the supply line 11 is connected to a pressure source, not shown, for example, an oil pump.
  • spray air is used in the example shown.
  • one of the lubricant associated nozzle opening 6 concentrically comprehensive air outlet opening 12 is provided, which goes off from a pressure chamber 13 which is acted upon via compressed air to a supply source not shown supply line 14 with compressed air.
  • a shut-off valve 15 is provided, through which the air supply to the pressure chamber 13 and thus to the air outlet opening and can be controlled abberichtbar.
  • the outflow rate ie the mass flow rate through the nozzle opening 6 per unit of time, which together with the speed of the substrate to be coated yields the coating thickness, is determined by means of a closed loop containing, in FIG. 2 regulated by a dash-dotted outline indicated control device 40.
  • each nozzle opening 6 is associated with a controller 16, the setpoint input 17 for the currently required outflow rate, that is, for the currently under the nozzle opening 6 located location of the substrate lubricant amount required, and an actual value input 18 for the mass flow rate through the supply line 11, which practically corresponds to the mass flow rate through the nozzle opening 6, and from the control deviation, that is from the difference between the setpoint and actual value, forms a control signal through which the closure member 7 forming valve needle so adjusted is that the control deviation disappears.
  • the lifting device forming the drive device 8 is subjected to more or less current.
  • a throttle device 19 is arranged, which is connected via a signal line 20 to the signal output of the associated controller 16 and by the output in response to the signal output from the controller 16, the current loading of the drive means 8 forming the solenoid assembly more or less increased or can be throttled.
  • a programmable microprocessor is suitably used.
  • the air supply is also expediently switched on and off, as indicated by a signal line 21 leading from the regulator 16 to the shut-off valve 15. In this case, no regulation, but only an up and down control takes place, wherein the air admission begins as soon as the nozzle opening 6 is opened and vice versa.
  • the setpoint for the mass flow rate comes from a suitable, in FIG. 2 setpoint adjuster 22 indicated by a circle.
  • the actual value is indicated by an in FIG. 2 merely indicated sensor 23 recorded.
  • this can, as from FIG. 3 can be seen, with a Venturiblende 24, that is provided with a cross-sectional constriction, which is associated with a pressure compensator 25, which provides a desired actual value of the mass flow rate corresponding output signal.
  • the pressure compensator 25 With the pressure compensator 25, the pressures in the area of the Venturi diaphragm 24 and in a line section outside thereof are measured.
  • the cross-sectional difference between Venturiblende 24 and the other supply line 11 leads to different speeds in the area of the Venturi nozzle 24 and outside thereof. These different speeds lead to different pressures, from which, in conjunction with the respectively associated cross-section, the speed and thus the mass throughput can be determined.
  • the regulators 16 all spray valves 4 is appropriate, as from FIG. 1 it can be seen associated with a common setpoint adjuster 22, which is suitably connected via a data bus 26 indicated by signal lines with the regulators 16 of all spray valves 4, which contain a suitable interface for this purpose.
  • the setpoint adjuster 22 is expediently embodied as a computer, which is provided with a memory in which the desired layer thickness values are stored in the region of the zones of the substrate respectively associated with the spray valves 4. These can be constant values or values of a layer thickness profile. To enter these values, the computer forming the setpoint adjuster 22 is provided with a suitable input device 22a.
  • the computer forming the setpoint adjuster 22 is coupled to sensors for determining the position of the substrate relative to the spray valves 6.
  • an associated with the transport device 2 drive means 3 cooperating incremental device 28 is provided which generates a signal at each, corresponding to a certain angle of rotation step and the output of which is located at an associated input 27 of the setpoint adjuster 22.
  • the computer forming this can calculate the transport distance from the number of signals and the speed of the metal sheets 1 from the number of signals per unit of time. The calculation is started by means of a sensor 29 which scans the leading edge of the sheet metal plates 1 and which can be designed, for example, as a light barrier, whose output is connected to a suitable input 30 of the computer forming the setpoint adjuster 22.
  • the target value for the outflow rate is formed by the setpoint adjuster 22.
  • the spray valves 4 are expediently switched on shortly before the opening of the nozzle opening 6. This too can be accomplished by means of the signals generated by the sensor 29.
  • the sensor 29 is simply arranged by a certain amount in front of the spray nozzles 4, so that they can first be focused and then opened with the distance to the sensor 29 corresponding time delay.
  • the temperature of the lubricant supplied to the spray valves 4 is kept constant at a desired level, resulting in a constant viscosity.
  • a throttle device 33 is arranged, which can be influenced by the associated controller 16.
  • This is provided with a setpoint input 34 for a temperature setpoint and an actual value input 35 for the actual value of the temperature of the spray nozzle 4 supplied lubricant.
  • the actual value of the temperature is recorded by means of a temperature sensor 36. This can be to achieve a compact arrangement in the FIG. 3 underlying measuring device for measuring the mass flow rate to be integrated.
  • the controller 16 via the input 24th a constant temperature setpoint specified.
  • This can also be stored in the common setpoint adjuster 22 and output from it for all spray valves 4 and transmitted by means of the data bus 26.
  • the common setpoint adjuster 22 requires in each case a memory for the temperature setpoints and in the case of a variation of these setpoints, a program suitable for this purpose.
  • the actual values present in the area of all spray valves 4 and the associated setpoint values and preferably the control deviations formed therefrom, that is to say the differences between setpoint and actual value, are displayed. These values are provided by the regulators 16 of the spray valves 4, as in FIG. 2 is indicated by a data output 37. The display can be done on the individual spray valves 4 respectively associated display devices.
  • central computer is provided with a central display device 38 which can be supplied via the data bus 26 with the values of the individual controller 16.
  • a recording device 39 is provided parallel to the display device 38, by means of which the displayed values are continuously logged.
  • each spray valve 4 may be assigned its own recording device, whereas in the example shown, a common recording device 39 assigned to the nominal value controller 22 is provided.
  • the recording device 39 could also be part of an even higher-level process control control.
  • the spray valve 4 contains, in addition to the spray nozzle 4a containing the nozzle opening 6 and the drive device associated with the nozzle needle, also the complete control device 40 for controlling the outflow rate and optionally the temperature. Accordingly, the spray valves 4 respectively form a completely preassembled, ready-to-connect unit which is connected only to the supply line 11 for supplying the coating medium, to the compressed air line 14 for supplying spray air and to the power source 10 for power supply and to the data bus 26 for effecting a data flow of and to which the setpoint adjuster 22 forming central computer must be connected. This also facilitates the maintenance and servicing, since such units can be easily replaced completely.

Landscapes

  • Spray Control Apparatus (AREA)
  • Nozzles (AREA)
  • Coating Apparatus (AREA)
  • Manufacturing Of Electric Cables (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The spray valve needle (7) is continuously-adjustable within a given range by a controller (16). This has a desired value input (17) for the instantaneously-demanded coating flowrate passed by the spray valve (4). It has an actual value input (18) for the mass flowrate passing through a supply section ahead of the nozzle opening (6). An actuator is signaled by the controller, to correct departures.

Description

Die Erfindung betrifft eine Vorrichtung zum Auftragen eines Beschichtungsmittels auf ein Substrat, insbesondere zum Auftragen eines Gleitmittels auf ein einer Tiefziehpresse zuführbares Blech, mit wenigstens einem eine mittels eines Verschlussorgans, das mittels einer zugeordneten Positioniereinrichtung positionierbar ist, hinsichtlich ihrer wirksamen Austrittsfläche veränderbare Düsenöffnung aufweisenden Sprühventil, an dem das Substrat vorbeibewegbar ist und dem das Beschichtungsmittel über eine Versorgungsleitung mit Druck zuführbar istThe invention relates to a device for applying a coating agent to a substrate, in particular for applying a lubricant to a deep-drawing press fed sheet, with at least one by means of a closure member which is positionable by means of an associated positioning, with respect to their effective exit surface variable nozzle opening having spray valve, where the substrate can be moved past and to which the coating agent can be supplied with pressure via a supply line

Eine derartige Anordnung ist in der DE 101 39 633 C1 angegeben. Die hierin beschriebene Anordnung dient zur Erzeugung einer konstanten Schichtdicke des Gleitmittels auf dem einer Tiefziehpresse zugeführten Blech, das während des Zuführvorgangs beschleunigt und verzögert wird. Dabei ist dem Verschlussorgan ein seine Öffnungsbewegung begrenzender Festanschlag zugeordnet, der als drehbare Nocke ausgebildet ist, die eine der Abhängigkeit zwischen der Geschwindigkeit des Substrats und der für eine konstante Schichtdicke benötigten Ausflussrate des Beschichtungsmittels bzw. der dieser zugeordneten Stellung des Verschlussorgans folgende Kontur aufweist und die drehbar ist und so gedreht wird, dass ihr der momentanen Geschwindigkeit des Substrats zugeordneter Umfangsbereich als Anschlag wirksam ist Diese Maßnahmen ergeben praktisch eine Festwertsteuerung, bei der die Stellung des Verschlussorgans gemäß einer festen Abhängigkeit von der Geschwindigkeit des Substrats eingestellt wird. Solange dabei keine Störgrößen wirksam sind, lässt sich hiermit die gewünschte Schichtdicke erreichen. Störgrößen, wie eine im Bereich der Düsenöffnung vorhandene Verschmutzung, eine Änderung der Viskosität des Beschichtungsmittels und dergleichen, können jedoch zu Ungenauigkeiten führen. Es kann daher zu einem Mangel an Gleitmittel kommen, was zu einer Beschädigung des Tiefziehformlings während des Tiefziehvorgangs und damit zur Produktion von Ausschuss führt. Im Langzeitbetrieb ist daher eine häufige, vorbeugende Wartung mit kurzen Wartungsintervallen erforderlich, um derartigen Gefahren vorzubeugen. Ein weiterer Nachteil ist darin zu sehen, dass auch bei einer ordnungsgemäßen Funktion nur die konstante Schichtdicke erzeugt werden kann. Diese muss sich aber an dem nur an einigen Stellen vorhandenen, maximalen Bedarf orientieren, was zu einem unnötig hohen Verbrauch an Beschichtungsmittel führt.Such an arrangement is in the DE 101 39 633 C1 specified. The arrangement described herein serves to produce a constant layer thickness of the lubricant on the sheet fed to a deep drawing press which is accelerated and decelerated during the feeding operation. In this case, the closure member associated with its opening movement limiting fixed stop, which is designed as a rotatable cam having the dependence of between the speed of the substrate and the required for a constant layer thickness outflow rate of the coating agent or the associated position of the closure member following contour and the is rotatable and is rotated so that its current speed of the substrate associated peripheral portion is effective as a stop These measures practically result in a fixed value control, in which the position of the closure member is set according to a fixed function of the speed of the substrate. As long as no disturbances are effective, the desired layer thickness can be achieved hereby. Disturbance variables, such as a contamination present in the region of the nozzle opening, a change in the viscosity of the Coating agent and the like, however, can lead to inaccuracies. It can therefore come to a lack of lubricant, resulting in damage to the thermoformed molding during the thermoforming process and thus the production of rejects. In long-term operation, therefore, frequent, preventive maintenance with short maintenance intervals is required to prevent such hazards. Another disadvantage is the fact that even with a proper function, only the constant layer thickness can be generated. However, this must be based on the maximum requirement existing only in some places, which leads to an unnecessarily high consumption of coating agent.

Die WO 02/43878 A lehrt eine Vorrichtung zum geregelten Auftragen von Kleb- und Dichtstoffen auf Trägermaterialien, die als wesentliche Bestandteile einen Vorratsbehälter für mindestens einen Kleb- und/oder Dichtstoff, eine Förderpumpe, einen Auftragskopf mit mindestens einer Auftragsdüse, einen Volumenstromsensor und eine Kontroll-Einheit mit dazugehörendem Datenverarbeitungsprogramm enthält. Der Vorratsbehälter, die Förderpumpe und der Auftzagskopf mit mindestens einer Auftragsdüse sind durch ein den Kleb- und/oder Dichtstoff führendes Leitungssystem miteinander verbunden. Der Volumenstromsensor und die Kontrolleinheit mit dazugehörendem Datenverarbeitungsprogramm sind über eine Impuls-Übertragungsleitung miteinander verbunden. Die Kontrolleinheit mit dazugehörendem Datenverarbeitungsprogramm, die Förderpumpe und der Auftragskopf sind über Steuerleitungen miteinander verbunden. Die Vorrichtung soll einen präzisen und konstanten Auftrag einer vorbestimmten Menge von Kleb- und/oder Dichtstoff in einer industriellen Fertigungsumgebung ermöglichen. Der Aufbau der Auftragsdüse ist nicht näher spezifiziert. Die Einstellung des Durchflusses des aufzutragenden Stoffes geschieht über eine Regelung der Förderpumpe.The WO 02/43878 A teaches a device for the controlled application of adhesives and sealants on support materials containing as essential components a reservoir for at least one adhesive and / or sealant, a feed pump, a gun with at least one application nozzle, a flow sensor and a control unit with associated data processing program contains. The storage container, the feed pump and the Auftzagskopf with at least one application nozzle are connected by a the adhesive and / or sealant leading pipe system. The volume flow sensor and the control unit with associated data processing program are connected to each other via a pulse transmission line. The control unit with associated data processing program, the feed pump and the gun are connected via control lines. The device is intended to enable a precise and constant application of a predetermined amount of adhesive and / or sealant in an industrial manufacturing environment. The structure of the application nozzle is not specified. The adjustment of the flow of the substance to be applied is done via a control of the feed pump.

Die Aufgabe der vorliegenden Erfindung ist es, eine Vorrichtung eingangs erwähnter Art mit einfachen und kostengünstigen Mitteln so zu verbessern, dass trotz eines geringen Warrungsaufwands auch im Langzeitbetrieb eine hohe Genauigkeit gewährleistet istThe object of the present invention is to improve a device of the type mentioned above with simple and inexpensive means so that despite a low Warrungsaufwands even in long-term operation, a high accuracy is guaranteed

Diese Aufgabe wird erfingdungsgemäß dadurch gelöst, dass das Verschlussorgan mittels der zugeordneten Positioniereinrichtung permanent innerhalb eines vorgegebenen Einstellfelds einstellbar ist, wobei der Positioniereinrichtung ein Regler zugeordnet ist, der zumindest einen Sollwert-Eingang für die momentan benötigte Ausflussrate des Beschichtungsmittels aus dem Sprühventil und wenigstens einen Istwert-Eingang für den Massendurchsatz in einem der Düsenöffnung vorgeordneten Versorgungsabschnitt aufweist und der aus der Regelabweichung ein die Positioniereinrichtung im Sinne einer Aufhebung der Regelabweichung beeinflussendes Stellsignal bildet, und dass die Position des Substrats innerhalb seines das Sprühventil passierenden Wegs mittels einer Wegmesseinrichtung erfassbar ist, deren Ausgang am Eingang eines als Rechner ausgebildeten Sollwert-Stellers liegt, in welchem die gewünschte Schichtdicke in Form eines über der in Transportrichtung verlaufenden Länge des Substrats vorgesehenen Schichtdickenprofils gespeichert ist und der aus dem Momentanwert der Position des Substrats und der dieser Position zugeordneten Schichtdicke den Sollwert für die Ausflussrate bildet, wobei der Beginn der Wegmessung vom Substrat aktivierbar istAccording to the invention, this object is achieved in that the closure member is permanently adjustable within a predetermined setting field by means of the associated positioning device, wherein a regulator is associated with the positioning device, the at least one setpoint input for the currently required outflow rate of the coating agent from the spray valve and at least one actual value Input for the mass flow rate in has a supply section upstream of the nozzle opening and which forms from the control deviation a positioning signal influencing the positioning in the sense of abolishing the control deviation, and that the position of the substrate within its path passing through the spray valve can be detected by means of a path measuring device whose output at the input of a trained as a computer Setpoint adjuster is located in which the desired layer thickness is stored in the form of a layer extending over the length of the substrate in the transport direction of the substrate thickness profile and the instantaneous value of the position of the substrate and the position associated layer thickness is the setpoint for the outflow rate, the beginning the distance measurement can be activated by the substrate

Diese Maßnahmen ergeben in vorteilhafter Weise einen geschlossenen Regelkreis zur Regelung der Ausflussrate, die in Verbindung mit der Geschwindigkeit des Substrats die gewünschte Beschichtungsdicke ergibt. Die erfindungsgemäße Regelung umfasst in vorteilhafter Weise alle die Ausflussrate beeinflussenden Parameter. Durch die Kaskadenregelung wird in vorteilhafter Weise über die Wegmessung auch die Geschwindigkeit des Substrats berücksichtigt, so dass auch bei einem gewünschten Schichtdickenprofil eine hohe Genauigkeit erreicht wird. Der Einfluss von Störgrößen wird daher in vorteilhafter Weise eliminiert. Dies ermöglicht lange Wartungsintervalle und gewährleistet dennoch auch im Langzeitbetrieb eine hohe Genauigkeit. Die Produktion von in Folge einer fehlerhaften Beschichtung unbrauchbaren Teilen lässt sich hiermit in vorteilhafter Weise weitestgehend verhindern. Infolge der permanente Verstellbarkeit des Verschlussorgans lässt sich durch Vorgabe eines entsprechenden Sollwerts in vorteilhafter Weise auch jede gewünschte Beschichtungsdicke und dementsprechend auch ein Beschichtungsprofil mit sich ändernder Dicke über der Beschlchtungslänge mit hoher Exaktheit erreichten. Hierdurch lässt sich der Verbrauch an Beschichtungsmittel optimieren. Die mit der Erfindung erzielbaren Vorteile sind daher insbesondere in einer ausgezeichneten Wirtschaftlichkeit zu sehen.These measures advantageously provide a closed loop control of the outflow rate which, in conjunction with the speed of the substrate, provides the desired coating thickness. The regulation according to the invention advantageously comprises all parameters influencing the outflow rate. The cascade control advantageously also takes into account the speed of the substrate via the displacement measurement, so that a high accuracy is achieved even with a desired layer thickness profile. The influence of disturbances is therefore eliminated in an advantageous manner. This allows long service intervals and still ensures high accuracy in long-term operation. The production of unusable parts as a result of a faulty coating can thus be largely prevented in an advantageous manner. As a result of the permanent adjustability of the closure member can be achieved by specifying a corresponding desired value in an advantageous manner, any desired coating thickness and, accordingly, a coating profile with varying thickness over the Beschchtungslänge with high accuracy. In this way, the consumption of coating agent can be optimized. The advantages achievable with the invention are therefore to be seen in particular in an excellent economy.

Vorteilhafte Ausgestaltungen und zweckmäßige Fortbildungen der übergeordneten Maßnahmen sind in den Unteransprüchen angegeben. So kann eine weitere vorteilhafte Maßnahme darin bestehen, dass der Regler einen zusätzlichen Sollwert-Eingang für die gewünschte Temperatur des Beschichtungsmittels und einen zusätzlichen Istwert-Eingang für die Temperatur in einem der Düsenöffnung vorgeordneten Versorgungsabschnitt aufweist und aus der Regelabweichung ein Stellsignal zur Einstellung einer einem der Düsenöffnung vorgeordneten Versorgungsabschnitt zugeordneten Heizeinrichtung bildet. Diese Maßnahmen ermöglichen in vorteilhafter Weise nicht nur die Einhaltung einer konstanten Temperatur, sondern vielmehr auch eine Änderung der Temperatur zusätzlich zur Änderung der Düsenöffnung und ergeben damit eine zusätzliche Möglichkeit zur Beeinflussung der Ausflussrate.Advantageous embodiments and expedient developments of the higher-level measures are specified in the subclaims. Thus, a further advantageous measure may consist in that the controller has an additional setpoint input for the desired temperature of the coating agent and an additional actual value input for the temperature in a supply section upstream of the nozzle opening and from the control deviation a control signal for setting a one of the Nozzle opening upstream supply section associated heating device forms. These measures advantageously allow not only the maintenance of a constant temperature, but also a change in the temperature in addition to the change of the nozzle opening and thus provide an additional possibility for influencing the outflow rate.

Dies kann vor allem dann von Vorteil sein, wenn bei eingestellter, größter Öffnung eine weitere Steigerung der Ausflussrate erforderlich ist.This can be of particular advantage if, with the largest opening set, a further increase in the outflow rate is required.

Vorteilhaft kann die das Sprühventil mit Beschichtungsmittel versorgende Versorgungsleitung mit einer Venturiblende versehen sein, der eine Druckwaage zugeordnet ist. Diese Maßnahmen ergeben eine einfache und dennoch sehr genaue Sensoranordnung zur Aufnahme des Massenstroms in der Versorgungsleitung.Advantageously, the supply line supplying the spray valve with coating agent can be provided with a Venturi lid, which is associated with a pressure compensator. These measures result in a simple yet very accurate sensor arrangement for receiving the mass flow in the supply line.

In weiterer Fortbildung der übergeordneten Maßnahmen kann eine Anzeige und/oder Aufzeichnungseinrichtung zur Anzeige und/oder Aufzeichnung der Regelabweichung vorgesehen sein. Diese Maßnahme ermöglicht eine einfache Kontrolle und erleichtert eine nachträglich Fehlersuche.In a further development of the higher-level measures, a display and / or recording device for displaying and / or recording the control deviation can be provided. This measure allows easy control and facilitates troubleshooting later.

Zwecksmäßig kann der Regler in das zugeordnete Sprühventil integriert sein. Diese ergibt eine einfache und kompakte Ausführung, bei der eine Peripherieverkabelung entfällt.Conveniently, the controller may be integrated into the associated spray valve. This results in a simple and compact design, eliminating the need for peripheral cabling.

Eine weitere vorteilhafte Ausgestaltung der übergeordneten Maßnahmen kann darin bestehen, dass über der Breite des Substrats mehrere, jeweils durch einen Regler regelbare Sprühventile vorgesehen sind und dass die Regler aller Sprühventile mit einem gemeinsamen Sollwertsteller verbunden sind, in welchem die Schichtdickenprofile der den Sprühventilen zugeordneten Zonen des Substrats gespeichert sind und der die Sollwerte für alle Sprühventile bildet, wobei zwischen dem Sollwertsteller und den Reglern der Sprühventile vorteilhaft ein Datenbus vorgesehen sein kann. Hierdurch wird eine besonders einfache und kompakte Ausführung erreicht.A further advantageous embodiment of the higher-level measures may be that over the width of the substrate several, each controllable by a regulator spray valves are provided and that the regulator of all spray valves are connected to a common setpoint adjuster, in which the layer thickness profiles of the spray valves associated zones of the Are stored substrate and the setpoints for all spray valves, wherein advantageously a data bus can be provided between the setpoint adjuster and the regulators of the spray valves. As a result, a particularly simple and compact design is achieved.

Weitere vorteilhafte Ausgestaltungen und zweckmäßige Fortbildungen der übergeordneten Maßnahmen sind in den restlichen Unteransprüchen angegeben und aus der nachstehenden Beispielsbeschreibung anhand der Zeichnung näher entnehmbar.Further advantageous embodiments and expedient developments of the parent measures are specified in the remaining subclaims and from the following description of the example with reference to the drawing closer.

In der nachstehend beschriebenen Zeichnung zeigen:

Figur 1
eine Frontansicht einer erfindungsgemäßen Auftragvorrichtung in schematischer Darstellung,
Figur 2
eine schematische Darstellung eines Sprühventils der Anordnung gemäß Figur 1 und
Figur 3
eine schematische Darstellung eines Durchsatz- und Temperaturfühlers der Anordnung gemäß Figur 1.
In the drawing described below:
FIG. 1
a front view of an applicator device according to the invention in a schematic representation,
FIG. 2
a schematic representation of a spray valve of the arrangement according to FIG. 1 and
FIG. 3
a schematic representation of a flow rate and temperature sensor of the arrangement according to FIG. 1 ,

Hauptanwendungsgebiet der vorliegenden Erfindung ist die Tiefziehverformung von Blechen. Beim Tiefziehen ergeben sich Gleitbewegungen zwischen Werkzeug und Werkstück. Um dabei ein sauberes, störungsfreies Gleiten zu ermöglichen, werden die der Tiefziehpresse zugeführten Bleche mit einem Gleitmittel, in der Regel Öl, beschichtet. Diese Beschichtung erfolgt in der Regel beidseitig. Da die Bleche jedoch nicht auf ihrer ganzen Oberfläche einer Gleitbewegung ausgesetzt sind, ist zur Einsparung von Gleitmittel eine bedarfsgerechte Verteilung des Gleitmittels auf der Oberfläche des umzuformenden Blechs erwünscht.Main field of application of the present invention is the thermoforming of sheets. During deep drawing, sliding movements occur between the tool and the workpiece. In order to allow a clean, trouble-free sliding, the sheets supplied to the deep-drawing press are coated with a lubricant, usually oil. This coating is usually done on both sides. Because the However, sheets are not exposed to a sliding movement on its entire surface, a need-based distribution of the lubricant on the surface of the sheet to be formed is desired to save lubricant.

Das mittels der Tiefziehpresse umzuformende Material, also das Substrat, wird der Tiefziehpresse dabei entweder in Form von Blechtafeln oder in Form eines endlosen Bands zugeführt. Der Anordnung gemäß Figur 1 liegt die Verarbeitung von Blechtafeln 1 zugrunde. Diese sind dabei mit gleichmäßigem Abstand aufeinander folgend auf einer hier als Förderband ausgebildeten, der nicht näher dargestellten Tiefziehpresse zugeordneten Vorschubeinrichtung 2 aufgenommen, die mittels einer Antriebseinrichtung 3 antreibbar ist. Bei jedem Takt der Tiefziehpresse wird eine Blechtafel 1 umgeformt. Die Tafeln müssen daher im Takt der Tiefziehpresse zugeführt werden. Dasselbe gilt natürlich auch für ein endloses Band.The material to be shaped by means of the deep-drawing press, ie the substrate, is supplied to the deep-drawing press either in the form of metal sheets or in the form of an endless belt. The arrangement according to FIG. 1 is based on the processing of metal sheets 1. These are successively spaced at a uniform distance on a here designed as a conveyor belt, not shown deep drawing press associated feed device 2, which is driven by a drive device 3. At each cycle of the deep-drawing press a metal sheet 1 is transformed. The panels must therefore be fed in time to the deep drawing press. The same goes for an endless band, of course.

Das einem Tiefziehvorgang zu unterwerfende Material wird in der Regel, wie schon erwähnt, auf beiden Seiten mit einem Gleitmittel beschichtet. Zur Vereinfachung der Darstellung ist in Figur 1 jedoch nur eine Beschichtung von oben dargestellt. Eine ähnliche Vorrichtung kann für die Beschichtung von unten vorgesehen sein.The material to be subjected to a deep-drawing process is usually, as already mentioned, coated on both sides with a lubricant. To simplify the illustration is in FIG. 1 however, only one coating is shown from above. A similar device may be provided for the bottom coating.

Die dargestellte Beschichtungsvorrichtung enthält mehrere, über der Breite des zu beschichtenden Substrats, also hier der Blechtafel 1, angeordnete Sprühventile 4. Diese enthalten jeweils, wie am besten aus Figur 2 erkennbar ist, einen Sprühkopf 4a mit einer Speicherkammer 5, in welcher das verwendete Gleitmittel, im dargestellten Beispiel Öl, unter Druck ansteht und von der eine zu ihrem Ausgang hin konisch sich verengende Düsenöffnung 6 abgeht, deren wirksamer Öffnungsquerschnitt mittels eines verstellbaren Verschlussorgans 7 veränderbar ist. Zur Bildung des Verschlussorgans 7 ist hier eine mit einer konischen Spitze in die Düsenöffnung 6 eingreifende Düsennadel vorgesehen, die mittels einer zweckmäßig als Linearmotor ausgebildeten Antriebseinrichtung 8 innerhalb ihres Einstellfeldes, das alle Positionen zwischen ganz geschlossen und ganz geöffnet umfasst, in axialer Richtung bewegbar ist. Der vorstehend genannte Linearmotor kann als Hubmagnet ausgebildet sein, der über eine Versorgungsschleife 9 mit einer Stromquelle, im dargestellten Beispiel mit dem Stromnetz 10 verbunden ist. In die Speicherkammer 5 mündet eine Versorgungsleitung 11, über die das Gleitmittel mit dem gewünschten Druck in die Speicherkammer 5 eingespeist wird. Hierzu ist die Versorgungsleitung 11 mit einer nicht näher dargestellten Druckquelle, beispielsweise einer Ölpumpe, verbunden.The coating device shown contains a plurality of, over the width of the substrate to be coated, so here the metal sheet 1, arranged spray valves 4. These each contain, as best of FIG. 2 It can be seen, a spray head 4a with a storage chamber 5, in which the lubricant used, in the example shown oil, under pressure and from the one conically narrowing to its output nozzle opening 6 goes off, the effective opening cross section by means of an adjustable closure member 7 is changeable , To form the closure member 7, a nozzle needle engaging into the nozzle opening 6 with a conical tip is provided here, which by means of a suitably designed as a linear motor drive means 8 within its Einstellfeldes, which includes all positions between fully closed and fully open, is movable in the axial direction. The above-mentioned linear motor can be designed as a lifting magnet, which is connected via a supply loop 9 with a power source, in the example shown with the power grid 10. In the storage chamber 5 opens a supply line 11 through which the lubricant is fed with the desired pressure in the storage chamber 5. For this purpose, the supply line 11 is connected to a pressure source, not shown, for example, an oil pump.

Zum Versprühen des Gleitmittels findet im dargestellten Beispiel Sprühluft Verwendung. Hierzu ist ein die dem Gleitmittel zugeordnete Düsenöffnung 6 konzentrisch umfassende Luftaustrittsöffnung 12 vorgesehen, die von einer Druckkammer 13 abgeht, die über an eine nicht näher dargestellte Druckluftquelle angeschlossene Versorgungsleitung 14 mit Druckluft beaufschlagbar ist. In der Versorgungsleitung 14 ist ein Absperrventil 15 vorgesehen, durch das die Luftzufuhr zur Druckkammer 13 und damit zur Luftaustrittsöffnung auf- und absteuerbar ist.For spraying the lubricant, spray air is used in the example shown. For this purpose, one of the lubricant associated nozzle opening 6 concentrically comprehensive air outlet opening 12 is provided, which goes off from a pressure chamber 13 which is acted upon via compressed air to a supply source not shown supply line 14 with compressed air. In the supply line 14, a shut-off valve 15 is provided, through which the air supply to the pressure chamber 13 and thus to the air outlet opening and can be controlled absteuerbar.

Um eine auch im Langzeitbetrieb genaue und bedarfsgerechte Beschichtung der Blechtafeln 1 mit Gleitmittel zu bewerkstelligen, wird die Ausflussrate, das heißt der Massedurchsatz durch die Düsenöffnung 6 pro Zeiteinheit, die zusammen mit der Geschwindigkeit des zu beschichtenden Substrats die Beschichtungsdicke ergibt, mittels einer einen geschlossenen Regelkreis enthaltenden, in Figur 2 durch eine strichpunktierte Umrandung angedeutete Regelungseinrichtung 40 geregelt. Dabei ist jeder Düsenöffnung 6 ein Regler 16 zugeordnet, der einen Sollwert-Eingang 17 für die momentan benötigte Ausflussrate, das heißt für die der momentan unter der Düsenöffnung 6 sich befindenden Stelle des Substrats benötigte Gleitmittelmenge, und einen Istwert-Eingang 18 für den Massedurchsatz durch die Versorgungsleitung 11, der praktisch dem Massedurchsatz durch die Düsenöffnung 6 entspricht, aufweist und der aus der Regelabweichung, das heißt aus der Differenz zwischen Sollwert und Istwert, ein Stellsignal bildet, durch das die das Verschlussorgan 7 bildende Ventilnadel so verstellt wird, dass die Regelabweichung verschwindet.In order to accomplish a coating of the metal sheets 1 with lubricants that is accurate and appropriate in long-term operation, the outflow rate, ie the mass flow rate through the nozzle opening 6 per unit of time, which together with the speed of the substrate to be coated yields the coating thickness, is determined by means of a closed loop containing, in FIG. 2 regulated by a dash-dotted outline indicated control device 40. In this case, each nozzle opening 6 is associated with a controller 16, the setpoint input 17 for the currently required outflow rate, that is, for the currently under the nozzle opening 6 located location of the substrate lubricant amount required, and an actual value input 18 for the mass flow rate through the supply line 11, which practically corresponds to the mass flow rate through the nozzle opening 6, and from the control deviation, that is from the difference between the setpoint and actual value, forms a control signal through which the closure member 7 forming valve needle so adjusted is that the control deviation disappears.

Hierzu wird der die Antriebseinrichtung 8 bildende Hubmagnet mit mehr oder weniger Strom beaufschlagt. Hierzu ist in der Versorgungsschleife 9 eine Drosseleinrichtung 19 angeordnet, die über eine Signalleitung 20 mit dem Signalausgang des zugeordneten Reglers 16 verbunden ist und durch die in Abhängigkeit von dem vom Regler 16 abgegebenen Signal die Strombeaufschlagung der die Antriebseinrichtung 8 bildenden Hubmagnetanordnung mehr oder weniger gesteigert bzw. gedrosselt werden kann. Zur Bildung des Reglers 16 wird zweckmäßig ein programmierbarer Mikroprozessor verwendet. Mittels des Reglers 16 wird zweckmäßig auch die Luftversorgung auf- und abgesteuert, wie durch eine vom Regler 16 zum Absperrventil 15 führende Signalleitung 21 angedeutet ist. Dabei findet keine Regelung, sondern nur eine Auf- und Absteuerung statt, wobei die Luftbeaufschlagung einsetzt, sobald die Düsenöffnung 6 geöffnet wird und umgekehrt.For this purpose, the lifting device forming the drive device 8 is subjected to more or less current. For this purpose, in the supply loop 9, a throttle device 19 is arranged, which is connected via a signal line 20 to the signal output of the associated controller 16 and by the output in response to the signal output from the controller 16, the current loading of the drive means 8 forming the solenoid assembly more or less increased or can be throttled. To form the regulator 16, a programmable microprocessor is suitably used. By means of the regulator 16, the air supply is also expediently switched on and off, as indicated by a signal line 21 leading from the regulator 16 to the shut-off valve 15. In this case, no regulation, but only an up and down control takes place, wherein the air admission begins as soon as the nozzle opening 6 is opened and vice versa.

Der Sollwert für den Massedurchsatz kommt von einem geeigneten, in Figur 2 durch einen Kreis angedeuteten Sollwert-Steller 22. Der Istwert wird durch einen in Figur 2 lediglich angedeuteten Messfühler 23 aufgenommen. Zur Messung des Massedurchsatzes durch die Versorgungsleitung 11 kann diese, wie aus Figur 3 erkennbar ist, mit einer Venturiblende 24, das heißt mit einer Querschnittsverengung, versehen sein, der eine Druckwaage 25 zugeordnet ist, die ein dem gewünschten Istwert des Massedurchsatzes entsprechendes Ausgangssignal liefert. Mit der Druckwaage 25 werden die Drücke im Bereich der Venturiblende 24 sowie in einem Leitungsabschnitt außerhalb hiervon gemessen. Der Querschnittsunterschied zwischen Venturiblende 24 und der sonstigen Versorgungsleitung 11 führt zu unterschiedlichen Geschwindigkeiten im Bereich der Venturidüse 24 und außerhalb hiervon. Diese unterschiedlichen Geschwindigkeiten führen zu unterschiedlichen Drücken, aus denen sich daher in Verbindung mit dem jeweils zugehörigen Querschnitt die Geschwindigkeit und damit der Massedurchsatz ermitteln lässt.The setpoint for the mass flow rate comes from a suitable, in FIG. 2 setpoint adjuster 22 indicated by a circle. The actual value is indicated by an in FIG. 2 merely indicated sensor 23 recorded. To measure the mass flow rate through the supply line 11, this can, as from FIG. 3 can be seen, with a Venturiblende 24, that is provided with a cross-sectional constriction, which is associated with a pressure compensator 25, which provides a desired actual value of the mass flow rate corresponding output signal. With the pressure compensator 25, the pressures in the area of the Venturi diaphragm 24 and in a line section outside thereof are measured. The cross-sectional difference between Venturiblende 24 and the other supply line 11 leads to different speeds in the area of the Venturi nozzle 24 and outside thereof. These different speeds lead to different pressures, from which, in conjunction with the respectively associated cross-section, the speed and thus the mass throughput can be determined.

Den Reglern 16 aller Sprühventile 4 ist zweckmäßig, wie aus Figur 1 ersichtlich ist, ein gemeinsamer Sollwertsteller 22 zugeordnet, der zweckmäßig über einen durch Signalleitungen angedeuteten Datenbus 26 mit den Reglern 16 aller Sprühventile 4 verbunden ist, die eine hierzu geeignete Schnittstelle enthalten. Der Sollwert-Steller 22 ist zweckmäßig als Rechner ausgebildet, der mit einem Speicher versehen ist, in welchem die gewünschten Schichtdickenwerte im Bereich der den Sprühventilen 4 jeweils zugeordneten Zonen des Substrats gespeichert sind. Dabei kann es sich um Konstantwerte oder um Werte eines Schichtdickenprofils handeln. Zur Eingabe dieser Werte ist der den Sollwert-Steller 22 bildende Rechner mit einer geeigneten Eingabeeinrichtung 22a versehen.The regulators 16 all spray valves 4 is appropriate, as from FIG. 1 it can be seen associated with a common setpoint adjuster 22, which is suitably connected via a data bus 26 indicated by signal lines with the regulators 16 of all spray valves 4, which contain a suitable interface for this purpose. The setpoint adjuster 22 is expediently embodied as a computer, which is provided with a memory in which the desired layer thickness values are stored in the region of the zones of the substrate respectively associated with the spray valves 4. These can be constant values or values of a layer thickness profile. To enter these values, the computer forming the setpoint adjuster 22 is provided with a suitable input device 22a.

Der den Sollwert-Steller 22 bildende Rechner ist mit Sensoren zur Bestimmung der Position des Substrats relativ zu den Sprühventilen 6 gekoppelt. Hierzu ist eine mit der der Transporteinrichtung 2 zugeordneten Antriebseinrichtung 3 zusammenwirkende Inkrementaleinrichtung 28 vorgesehen, die bei jedem, einem gewissen Drehwinkel entsprechenden Schritt ein Signal erzeugt und deren Ausgang an einem zugeordneten Eingang 27 des Sollwert-Stellers 22 liegt. Der diesen bildende Rechner kann aus der Anzahl der Signale die Transportstrecke und aus der Anzahl der Signale pro Zeiteinheit die Geschwindigkeit der Blechtafeln 1 berechnen. Die Berechnung wird mittels eines die Vorderkante der Blechtafeln 1 abtastenden Sensors 29, der beispielsweise als Lichtschranke ausgebildet sein kann, gestartet, dessen Ausgang mit einem geeigneten Eingang 30 des den Sollwert-Steller 22 bildenden Rechners verbunden ist. Dieser kann dementsprechend die exakte Position der Blechtafeln 1 innerhalb ihres die Sprühdüsen 4 passierenden Wegs und damit die Koordinaten jeder Stelle der Blechtafeln 1 berechnen, die sich unterhalb einer Sprühdüse 4 befindet. Aus diesem Momentanwert und der der betreffenden Stelle zugeordneten Schichtdicke wird vom Sollwert-Steller 22 der Sollwert für die Ausflussrate gebildet.The computer forming the setpoint adjuster 22 is coupled to sensors for determining the position of the substrate relative to the spray valves 6. For this purpose, an associated with the transport device 2 drive means 3 cooperating incremental device 28 is provided which generates a signal at each, corresponding to a certain angle of rotation step and the output of which is located at an associated input 27 of the setpoint adjuster 22. The computer forming this can calculate the transport distance from the number of signals and the speed of the metal sheets 1 from the number of signals per unit of time. The calculation is started by means of a sensor 29 which scans the leading edge of the sheet metal plates 1 and which can be designed, for example, as a light barrier, whose output is connected to a suitable input 30 of the computer forming the setpoint adjuster 22. This can accordingly the exact position of the metal sheets 1 within their the spray nozzles 4 passing way and thus calculate the coordinates of each point of the metal sheets 1, which is located below a spray nozzle 4. From this instantaneous value and the layer assigned to the respective layer thickness, the target value for the outflow rate is formed by the setpoint adjuster 22.

Die Sprühventile 4 werden zweckmäßig kurz vor der Öffnung der Düsenöffnung 6 eingeschaltet. Auch dies kann mittels der vom Sensor 29 erzeugten Signale bewerkstelligt werden. Hierzu ist der Sensor 29 einfach um ein bestimmtes Maß vor den Sprühdüsen 4 angeordnet, so dass diese zunächst scharf gestellt und dann mit dem Abstand zum Sensor 29 entsprechender Zeitverzögerung geöffnet werden können.The spray valves 4 are expediently switched on shortly before the opening of the nozzle opening 6. This too can be accomplished by means of the signals generated by the sensor 29. For this purpose, the sensor 29 is simply arranged by a certain amount in front of the spray nozzles 4, so that they can first be focused and then opened with the distance to the sensor 29 corresponding time delay.

Um die Regelung der Ausflussrate zu vereinfachen und eine hohe Funktionssicherheit zu gewährleisten, wird die Temperatur des den Sprühventilen 4 zugeführten Gleitmittels auf einem gewünschten Niveau konstant gehalten, wodurch sich eine konstante Viskosität ergibt. Hierzu ist den Sprühköpfen 4a der Sprühventile 4 sowie dem sprühkopfnahen Bereich der Versorgungsleitung 11 eine hier durch eine elektrische Heizwendel gebildete Heizeinrichtung 31 zugeordnet, die über eine Versorgungsschleife 32 mit einer Stromquelle, beispielsweise dem installierten Stormnetz, verbunden ist. In der Versorgungsschleife 32 ist eine Drosseleinrichtung 33 angeordnet, die durch den zugeordneten Regler 16 beeinflussbar ist. Dieser ist mit einem Sollwert-Eingang 34 für einen Temperatur-Sollwert sowie einem Istwert-Eingang 35 für den Istwert der Temperatur des der Sprühdüse 4 zugeführten Gleitmittels versehen. Der Istwert der Temperatur wird mittels eines Temperaturfühlers 36 aufgenommen. Dieser kann zur Erzielung einer kompakten Anordnung in die der Figur 3 zugrundeliegende Messvorrichtung zur Messung des Massedurchsatzes integriert sein.In order to simplify the control of the outflow rate and to ensure high reliability, the temperature of the lubricant supplied to the spray valves 4 is kept constant at a desired level, resulting in a constant viscosity. For this purpose, the spray heads 4 a of the spray valves 4 and the spray head near area of the supply line 11 assigned here by an electric heating coil heater 31, which is connected via a supply loop 32 to a power source, such as the installed storm network. In the supply loop 32, a throttle device 33 is arranged, which can be influenced by the associated controller 16. This is provided with a setpoint input 34 for a temperature setpoint and an actual value input 35 for the actual value of the temperature of the spray nozzle 4 supplied lubricant. The actual value of the temperature is recorded by means of a temperature sensor 36. This can be to achieve a compact arrangement in the FIG. 3 underlying measuring device for measuring the mass flow rate to be integrated.

In der Regel genügt es, wenn die Temperatur des Beschichtungsmittels konstant gehalten wird. Hierzu wird dem Regler 16 über den Eingang 24 ein konstanter Temperatur-Sollwert vorgegeben. Dieser kann ebenfalls im gemeinsamen Sollwert-Steller 22 abgelegt sein und von diesem für alle Sprühventile 4 ausgeben und mittels des Datenbusses 26 übertragen werden. Es ist aber auch denkbar, den Temperatur-Sollwert mittels des Sollwert-Stellers 22 zu variieren, um hiermit die Ausflussrate zusätzlich zur Stellung der das Verschlussorgan 7 bildenden Ventilnadel zu variieren. Der gemeinsame Sollwert-Steller 22 benötigt in jedem Fall einen Speicher für die Temperatursollwerte und im Falle einer Variation dieser Sollwerte ein hierfür geeignetes Programm.As a rule, it is sufficient if the temperature of the coating agent is kept constant. For this purpose, the controller 16 via the input 24th a constant temperature setpoint specified. This can also be stored in the common setpoint adjuster 22 and output from it for all spray valves 4 and transmitted by means of the data bus 26. However, it is also conceivable to vary the temperature setpoint value by means of the setpoint adjuster 22 in order to vary the outflow rate in addition to the position of the valve member forming the closure member 7. The common setpoint adjuster 22 requires in each case a memory for the temperature setpoints and in the case of a variation of these setpoints, a program suitable for this purpose.

Um eine laufende Sichtkontrolle des Beschichtungsvorgangs zu ermöglichen werden die im Bereich sämtlicher Sprühventile 4 vorhandenen Istwerte sowie die zugehörigen Sollwerte und vorzugsweise die hieraus gebildeten Regelabweichungen, das heißt die Differenzen zwischen Soll- und Istwert angezeigt. Diese Werte werden von den Reglern 16 der Sprühventile 4 geliefert, wie in Figur 2 durch einen Datenausgang 37 angedeutet ist. Die Anzeige kann auf den einzelnen Sprühventilen 4 jeweils zugeordneten Anzeigeeinrichtungen erfolgen. Bei dem der Figur 1 zugrundeliegenden Beispiel ist der den Sollwert-Steller 22 bildende, zentrale Rechner mit einer zentralen Anzeigeeinrichtung 38 versehen, die über den Datenbus 26 mit den Werten der einzelnen Regler 16 versorgt werden kann. Um eine eventuell notwendig werdende, spätere Fehlersuche zu erleichtern ist parallel zur Anzeigeeinrichtung 38 eine Aufzeichnungseinrichtung 39 vorgesehen, durch die die angezeigten Werte laufende protokolliert werden. Auch hier gilt, dass jedem Sprühventil 4 eine eigene Aufzeichnungseinrichtung zugeordnet sein kann, wogegen im dargestellten Beispiel eine dem den Sollwert-Steller 22 bildenden Zentralrechner zugeordnete, gemeinsame Aufzeichnungseinrichtung 39 vorgesehen ist. Die Aufzeichnungseinrichtung 39 könnte aber auch Teil einer noch weiter übergeordneten Prozessleitsteuerung sein.In order to enable an ongoing visual inspection of the coating process, the actual values present in the area of all spray valves 4 and the associated setpoint values and preferably the control deviations formed therefrom, that is to say the differences between setpoint and actual value, are displayed. These values are provided by the regulators 16 of the spray valves 4, as in FIG. 2 is indicated by a data output 37. The display can be done on the individual spray valves 4 respectively associated display devices. In which the FIG. 1 Underlying example of the setpoint adjuster 22 forming, central computer is provided with a central display device 38 which can be supplied via the data bus 26 with the values of the individual controller 16. In order to facilitate any subsequent troubleshooting which may become necessary, a recording device 39 is provided parallel to the display device 38, by means of which the displayed values are continuously logged. Again, each spray valve 4 may be assigned its own recording device, whereas in the example shown, a common recording device 39 assigned to the nominal value controller 22 is provided. However, the recording device 39 could also be part of an even higher-level process control control.

Die in Figur 2 durch eine strichpunktierte Linie umgrenzte Regelungseinrichtung 40 ist zweckmäßig, wie in Figur 1 angedeutet ist, in das zugeordnete Sprühventil 4 integriert. Dieses enthält dementsprechend neben dem die Düsenöffnung 6 enthaltenden Sprühkopf 4a und der der Düsennadel zugeordneten Antriebseinrichtung auch die komplette Regeleinrichtung 40 zur Regelung der Ausflussrate und gegebenenfalls der Temperatur. Die Sprühventile 4 bilden dementsprechend jeweils eine komplett vormontierte, anschlussfertige Baueinheit, die lediglich an die Versorgungsleitung 11 zur Zufuhr des Beschichtungsmediums, an die Druckluftleitung 14 zur Zufuhr von Sprühluft sowie an die Stromquelle 10 zur Stromversorgung und an den Datenbus 26 zur Bewerkstelligung eines Datenflusses von und zu dem den Sollwert-Steller 22 bildenden Zentralrechner angeschlossen werden müssen. Dies erleichtert auch die Wartung und Instandhaltung, da derartige Baueinheiten einfach komplett ausgetauscht werden können.In the FIG. 2 by a dash-dotted line bounded control device 40 is appropriate, as in FIG. 1 is indicated in the associated spray valve 4 integrated. This accordingly contains, in addition to the spray nozzle 4a containing the nozzle opening 6 and the drive device associated with the nozzle needle, also the complete control device 40 for controlling the outflow rate and optionally the temperature. Accordingly, the spray valves 4 respectively form a completely preassembled, ready-to-connect unit which is connected only to the supply line 11 for supplying the coating medium, to the compressed air line 14 for supplying spray air and to the power source 10 for power supply and to the data bus 26 for effecting a data flow of and to which the setpoint adjuster 22 forming central computer must be connected. This also facilitates the maintenance and servicing, since such units can be easily replaced completely.

Claims (14)

  1. A device for applying a coating material to a substrate, in particular for applying a lubricant to a sheet which is feedable to a deep drawing press, comprising at least one spray valve (4) having a nozzle opening (6) which can be varied by means of a closing element (7) with respect to its effective issuing surface, which closing element can be positioned by means of an associated positioning device (8), the substrate being movable past the said spray valve and suppliable under pressure with the coating material by means of a supply line (11), with the closing element (7) being permanently adjustable within a defined adjusting field by means of the associated positioning device, characterised in that a controller (16) is associated with a positioning device, such controller comprising at least one setpoint value input (17) for the currently required discharge rate of the coating material from the spray valve (4), and at least one actual value input (18) for the mass flow rate through a supply section arranged upstream of the nozzle opening (6), such controller (16) using the deviation to form a control signal (20) which controls the said positioning device in the sense that the deviation is compensated and further characterised in that the position of the substrate (1) on its way passing the spray valve (4) can be sensed by a displacement measuring device (28, 29) whose output is provided to the input of a setpoint generator (22) in which the desired thickness of the coating is programmed in the form of a coating thickness profile extending over the length of the substrate (1) in transport direction, and which setpoint generator (22) generates the setpoint value for the discharge rate from the actual value of the position of the substrate (1) and the thickness of the coating associated therewith, with the commencement of the displacement measurement being activatable by the substrate (1).
  2. A device in accordance with claim 1, characterised in that the displacement measuring device (28, 29) is associated with the transport device (2) moving the substrate (1) past the spray valve (4).
  3. A device in accordance with any of the preceding claims, characterised in that the on/off switchable components of the spray valve (4) can be switched on and off by the setpoint generator (22) arranged upstream of the nozzle opening (6).
  4. A device in accordance with any of the preceding claims, characterised in that the controller (16) comprises an additional setpoint value input (34) for the desired temperature of the coating material and an additional actual value input (35) for the temperature in a supply section arranged upstream of the nozzle opening (6), and from the deviation thereof generates a control signal for adjusting a heating device (31) which is associated with a supply section arranged upstream of the nozzle opening (6).
  5. A device in accordance with any of the preceding claims, characterised in that the spray valve (4) via a pressure line (14) is suppliable with spray air for spraying the coating material, and further that a valve (15) is provided in the pressure line (14), which can be switched on by the controller (16) as the nozzle opening (6) opens, and vice versa.
  6. A device in accordance with any of the preceding claims, characterised in that upstream of the actual value input (18) provision is made for a mass flow measuring unit which comprises a Venturi diaphragm (24) and a pressure regulator(25) associated therewith.
  7. A device in accordance with claim 6, characterised in that a temperature sensor (36) is integrated in the mass flow measuring unit, which is arranged upstream of the actual value input (35) of the controller (16).
  8. A device in accordance with any of the preceding claims, characterised in that the spray valve (4) is provided with a spray head (4a) comprising a conical nozzle opening (6) extending from the storage chamber (5) which is connected to the supply line (11), such conical nozzle opening being associated with a valve needle forming the closing element (7), which is axially movable by means of a drive device (8) forming the positioning device and controllable by the controller (16).
  9. A device in accordance with claim 8, characterised in that the drive device (8) is designed as a linear motor, preferably in the form of an electric lifting magnet arrangement comprising a coil which is suppliable with electric current, such current supply being controllable by the controller (16).
  10. A device in accordance with any of the preceding claims, characterised in that the controller (16) is designed as a programmable micro processor.
  11. A device in accordance with any of the preceding claims, characterised in that provision is made for a display unit (38) and/or a recording unit (39) for displaying and/or recording the deviations and/or their components in the form of the actual discharge rates and the corresponding setpoint values.
  12. A device in accordance with any of the preceding claims, characterised in that the spray valve (4) is provided with an integrated control unit (40) comprising the controller (16).
  13. A device in accordance with any of the preceding claims, characterised in that provision is made for several spray valves (4) extending across the width of the substrate (1), each of them being controllable by a controller (16), and that the controllers (16) of all spray valves (4) are connected to a common setpoint generator (22) which is designed as a computer comprising at least one memory saving the coating thickness values of the zones assigned to the spray valves (4) and, as the case may be, the temperature of the coating material, and which generates the setpoint values for all spray valves (4).
  14. A device in accordance with claim 13, characterised in that the setpoint generator (22) is connected to the controllers (16) of the associated spray valves (4) by means of a data bus (26).
EP03019218A 2002-08-28 2003-08-26 Device for applying coating material Expired - Lifetime EP1393817B1 (en)

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US20040163589A1 (en) 2004-08-26
US7018476B2 (en) 2006-03-28
EP1393817A2 (en) 2004-03-03
ATE484342T1 (en) 2010-10-15
DE50313172D1 (en) 2010-11-25
DE10239351A1 (en) 2004-03-11
DE10239351B4 (en) 2006-07-27
EP1393817A3 (en) 2006-05-10

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