EP0166092B1 - Verfahren und Vorrichtung zum Einstellen eines Durchflussmengen Steuerventils einer Farbspritzpistole - Google Patents

Verfahren und Vorrichtung zum Einstellen eines Durchflussmengen Steuerventils einer Farbspritzpistole Download PDF

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Publication number
EP0166092B1
EP0166092B1 EP85104010A EP85104010A EP0166092B1 EP 0166092 B1 EP0166092 B1 EP 0166092B1 EP 85104010 A EP85104010 A EP 85104010A EP 85104010 A EP85104010 A EP 85104010A EP 0166092 B1 EP0166092 B1 EP 0166092B1
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EP
European Patent Office
Prior art keywords
flow
flow rate
control valve
valve
microcomputer
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
Application number
EP85104010A
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German (de)
English (en)
French (fr)
Other versions
EP0166092A1 (de
Inventor
Hans-Joachim Dipl.-Phys. Boll
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.)
J Wagner GmbH
Original Assignee
J Wagner GmbH
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 J Wagner GmbH filed Critical J Wagner GmbH
Publication of EP0166092A1 publication Critical patent/EP0166092A1/de
Application granted granted Critical
Publication of EP0166092B1 publication Critical patent/EP0166092B1/de
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—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

Definitions

  • the invention relates to a method for adjusting the paint flow rate of a motor-driven flow control valve of a paint spray gun, in particular an automatic paint spray gun with frequent flow rate and color changes, preferably for the assembly line spraying of automobile bodies, in which during the paint flow through the flow control valve Flow rate measured continuously, the measured values determined as actual values compared with a predetermined target value and the flow control valve is readjusted to the target value on the basis of this comparison.
  • Flow rate measured continuously, the measured values determined as actual values compared with a predetermined target value and the flow control valve is readjusted to the target value on the basis of this comparison.
  • the flow rate sensor sends an actual value signal to the control system, which compares it with the setpoint value and the Passage of the control valve is reduced on the basis of the determined difference by means of an actuator.
  • the minimum spraying time to enable regulation must be greater than the sum of the measuring time, the computing time and the change time of the control valve.
  • flow rate sensors work comparatively slowly, and the rate of change of the control valve must be comparatively low, because otherwise overregulations and thus so-called leveling processes occur. In practice, this results in times of several seconds. This may be relevant for long spraying times (for example 15 to 30 minutes), but not for short spraying times (for example 30 seconds) and leads to the impossibility of control in the case of extremely short spraying times (for example 2 seconds).
  • the solution to this problem is that a sequence of assignments between flow rate values and electric valve motor actuation signals is first created and entered into a microcomputer as an approximation table, and then by selecting the desired flow rate value, the microcomputer is prompted to actuate the tabular associated actuation signal as the control signal for the valve motor to supply and so to set the flow control valve to this target value before the start of the color flow, and that the comparison between the target value and the actual values of the flow rate is then carried out in the microcomputer, which is then based on this comparison Valve motor feeds control signals and so the flow control valve continuously readjusted to the target value.
  • a table is therefore created in advance for each color, in which an opening value of the control valve (or a specific command signal for the control valve control element) is assigned to different flow rate values.
  • This table is created experimentally by spraying tests, and this table can be improved automatically during the actual spraying processes. If a spraying process is now carried out, the entry of the table value means that the control valve is already set to the associated opening value. Only then is the on-off valve opened and the sharpening process begins.
  • the color flow rate sensor now measures the actual value, and if the actual value deviates from the target value, the opening size of the control valve is readjusted.
  • a particularly expedient embodiment of the inventive method is characterized in claim 2.
  • 10 denotes a paint spray gun, which is fed by a paint supply line 11.
  • the line 11 is in turn from a color change unit 12 supplied with color, which a number of color connections 12 1 to 12 10 for different colors, an integrated flushing group 12 a with connections 12a, 12a 2 and 12a 3 for purge air, solvent and sliding air and finally one with the line 11 connected exhaust valve 12b.
  • a flow meter 13 In the line 11 there are a flow meter 13, a flow control valve 14 and a release valve 15 in the direction from the color changing unit 12 to the gun 10.
  • the flow meter 13 transmits its measurement signals to a microcomputer 16 via a line 13a.
  • the flow control valve 14 is actuated via a gear 17 by a stepping motor 18, which is connected via a control 19 to a voltage supply 20 which also serves to supply the microprocessor 16 with energy.
  • the transmission 17 is connected to the microprocessor 16 via a signal line 17a and the control 19 via a control line 19a.
  • the release valve 15, preferably a solenoid valve, can be operated manually, for example via a reed contact of the gun trigger, via a higher-level control system, or via the connecting line 15a from the microcomputer 16. With 21 a usual return line with valve 21a is designated.
  • the microcomputer 16 is also connected to an input display device 22, specifically via a setpoint line 22 1 , a color change line 22 2 and an enable line 22 3 . Finally, the microprocessor 16 is connected to the color changing unit 12 via a line 12c.
  • a superordinate control for example a mainframe computer, to which the microcomputer 16 is connected via the line 23a.
  • the operator inputs the desired color type and a target value for the flow into the microcomputer 16 via the input display device 22, with the result that the latter sets the color changing unit 12 accordingly and via the control unit 19 and / or the transmission 17 controls the flow valve 14 to this target value.
  • the operator now opens the release valve 15, for example by actuating the pistol trigger or by pressing a corresponding key on the input / display unit 22, then there is a color flow in line 11, the flow sensor 13 giving the microcomputer 16 the actual values of the Flow in line 11 transmitted. Based on these actual values, the microcomputer 16 regulates the flow valve 14 to the exact target value and ensures that this target value is maintained exactly.
  • a flow rate table is created. This means that for each color for different flow values, the positions of the stepping motor 18 or the gear 17, which correspond to certain opening widths of the flow control valve 14, are determined.
  • the table can also be created automatically by the microprocessor, but this requires a color flow (test spraying). If there is a linear dependency, then two data are sufficient for each color, if the dependency is not linear, then several table values must be created, the number of which depends on the required initial accuracy. In practice it has been shown that satisfactory results are achieved if the table error is less than ten percent, ie the deviation of the table target value from the actual target value does not exceed ten percent. The table values created are then stored in the microcomputer 16.
  • the operator or the higher-level control system - as mentioned - enters the desired flow value and color in the microcomputer.
  • the microcomputer then actuates the stepper motor 18 and / or the gear 17 on the basis of the stored table and thus sets the flow control valve 14 to an apriori value which corresponds to a flow rate close to the flow rate setpoint, for example with a deviation from maximaI ⁇ 10%.
  • the flow in line 11 is started by opening the release valve 15, the flow rate transmitter 13 continuously transmits the actual actual values of the flow rate to the microcomputer 16 and the microcomputer 16 regulates on the basis of a comparison between the actual value and the desired value the valve 14 until the actual value and the target value match, which can be considered in practice if the deviation is less than three percent.
  • the microcomputer 16 calculates the new position of the stepper motor on the basis of the stored table and sets the valve 14 to the new apriori value, for which times up to a maximum of about 1 second are required. Then the above-mentioned control process takes place again until the target value and the actual value match.
  • the apriori value can be set both in the idle state (no color flow) and in the operating state (color flow); the control process, on the other hand, understandably requires the presence of a color flow.
  • the stored table it should be taken into account that, for a given opening width of the valve 14, the amount of passage depends on the viscosity of the paint flowing through, the viscosity in turn a function tion of the temperature is. Temperature changes during the day therefore lead to the table, which is stored in the morning for example, becoming inaccurate. For this reason, it is expedient to provide the microcomputer with a table correction program which automatically corrects the table as a function of a temperature sensor or the deviations of the apriori values from the actual values measured by the flow sensor 13 during operation.
  • the flow control valve 14 When changing the color, the flow control valve 14 is opened completely so as to keep the color change time as short as possible. During the color change, the line is flushed with solvent and purge air. It would not make sense to carry out flow measurements and / or controls because it is only important that the flushing process can be carried out quickly. After the rinse cycle, the valve 14 is set to the newly selected target value or returns to the target value before the color change.
  • FIG. 2 shows a typical example of the control process according to the invention.
  • the flow rate is given on the ordinate and the time course on the abscissa.
  • the process therefore begins with a color change (full passage for the detergent) and ends with a color change, with three different target values 1, 2 and 3 being provided between these two color changes.
  • the valve 14 With each change in the target value, the valve 14 is first set to the a priori value (table value), whereupon the control is carried out on the basis of the measured actual values.
  • the apriori setting to the first setpoint is without color flow (release valve 15 closed), whereas the other two setpoints are with flowing paint (release valve 15 open).
  • the process corresponds to the spraying of an automobile body, which is guided past the assembly line at the spraying station and has three zones of different paint application strength.
  • a very inexpensive valve configuration with drive consists, for example, of a needle valve and a stepper motor.
  • the needle valve has a spindle drive.
  • This spindle can be connected directly to the drive shaft of the stepper motor via a coupling. This eliminates the gearbox and you also get a very high resolution of 1: 5000, for example.
  • this valve arrangement consisting of a spindle-driven needle valve and stepper motor has good emergency running properties, because on the one hand the stepper motor and thus that The valve remains in its position and can also be mechanically adjusted by hand using a handwheel which is attached to the stepper motor axis.
  • Possible modifications of the method relate in particular to the connection of the microcomputer to a higher-level system, such as a mainframe. This makes it possible, for example, to bring about an exchange of data between the workpiece conveyor and the spraying system in such a way that all the conditions of the workpiece supply are transferred to the spraying system and the latter thus operates fully automatically.
  • the invention can be used with paint spraying devices of all kinds, that is to say both with rotary atomizers and with high-pressure atomizers as well as with compressed air atomizers, in which case a corresponding pressure flow control of the compressed air is also conceivable.

Landscapes

  • Spray Control Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP85104010A 1984-06-22 1985-04-02 Verfahren und Vorrichtung zum Einstellen eines Durchflussmengen Steuerventils einer Farbspritzpistole Expired EP0166092B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3423094 1984-06-22
DE19843423094 DE3423094A1 (de) 1984-06-22 1984-06-22 Verfahren und vorrichtung zum einstellen eines durchflussmengen-steuerventils einer farbspritzpistole

Publications (2)

Publication Number Publication Date
EP0166092A1 EP0166092A1 (de) 1986-01-02
EP0166092B1 true EP0166092B1 (de) 1988-12-21

Family

ID=6238920

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85104010A Expired EP0166092B1 (de) 1984-06-22 1985-04-02 Verfahren und Vorrichtung zum Einstellen eines Durchflussmengen Steuerventils einer Farbspritzpistole

Country Status (4)

Country Link
US (1) US4720801A (enrdf_load_stackoverflow)
EP (1) EP0166092B1 (enrdf_load_stackoverflow)
JP (1) JPS6111169A (enrdf_load_stackoverflow)
DE (1) DE3423094A1 (enrdf_load_stackoverflow)

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US4992952A (en) * 1987-09-21 1991-02-12 Mazda Motor Corporation Paint discharge rate control system
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SE458749B (sv) * 1988-05-18 1989-05-08 Bengtsson Bengt Goeran Foerfarande och anordning foer reglering av sprutning av belaeggningsmaterial
DE3822835A1 (de) * 1988-07-06 1990-03-08 Josef Schucker Verfahren und anordnung zum lackieren von werkstueckoberflaechen
US5289388A (en) * 1989-04-21 1994-02-22 Vickers, Incorporated Electrohydraulic control of a die casting machine
US5065695A (en) * 1989-06-16 1991-11-19 Nordson Corporation Apparatus for compensating for non-linear flow characteristics in dispensing a coating material
DE3926624A1 (de) * 1989-08-11 1991-02-14 Gema Ransburg Ag Elektrostatische pulverbeschichtungseinrichtung
DE3927880C2 (de) * 1989-08-23 1998-07-30 Behr Industrieanlagen Verfahren und Anlage zum Beschichten von Gegenständen mit häufig wechselndem Farbmaterial
JPH05231546A (ja) * 1991-03-07 1993-09-07 Fanuc Ltd 産業用ロボットによるシーリングにおけるシール材流量制御方法
WO1992017281A1 (de) * 1991-03-27 1992-10-15 Sca Schucker Gmbh Verfahren und vorrichtung zum aufbringen einer pastösen masse
DE4325044C2 (de) † 1993-07-26 2002-07-18 Itw Gema Ag Pulverfördervorrichtung, insbesondere für Beschichtungspulver
US5389149A (en) * 1993-12-08 1995-02-14 Monarch Design Company, Inc. Paint system
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US5687092A (en) * 1995-05-05 1997-11-11 Nordson Corporation Method of compensating for changes in flow characteristics of a dispensed fluid
US6190454B1 (en) 1997-06-19 2001-02-20 Dean Robert Gary Anderson Printer cartridge
US5944893A (en) * 1997-06-19 1999-08-31 Anderson; Dean Robert Gary Metering device for paint for digital printing
US5972111A (en) * 1997-06-19 1999-10-26 Anderson; Dean Robert Gary Metering device for paint for digital printing
US6786971B2 (en) 1997-06-19 2004-09-07 Dean Robert Gary Anderson Method and apparatus for digital printing
DE10139633C1 (de) * 2001-08-11 2003-04-24 Amtec Kistler Gmbh Vorrichtung zum Auftragen eines Beschichtungsmittels
DE10142355A1 (de) * 2001-08-30 2003-03-20 Duerr Systems Gmbh Beschichtungsanlage mit einem Regelkreis
WO2005073118A1 (ja) 2004-01-28 2005-08-11 Toray Industries, Inc. 糸道ガイド、繊維束の綾振り装置および繊維束パッケージの製造装置
DE102006002389A1 (de) * 2006-01-17 2007-07-19 SCHÜTZE, Thomas System zur Zuführung mehrere Farbkomponenten für mindestens eine Lackierstation, insbesondere für Kraftfahrzeugkarosserien
DE102007062132A1 (de) * 2007-12-21 2009-07-02 Dürr Systems GmbH Testverfahren und Testgerät zur Funktionsprüfung einer Lackiereinrichtung
JP5231891B2 (ja) * 2008-07-31 2013-07-10 アネスト岩田株式会社 空圧制御弁を用いた塗料供給制御方法
EP3137229B1 (en) 2014-05-01 2019-03-27 Graco Minnesota Inc. Method for flow control calibration of high-transient systems
CN106170346B (zh) 2014-05-01 2019-04-19 固瑞克明尼苏达有限公司 封闭的系统中的流体压力控制方法
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Also Published As

Publication number Publication date
JPS6111169A (ja) 1986-01-18
US4720801A (en) 1988-01-19
DE3423094C2 (enrdf_load_stackoverflow) 1990-10-04
EP0166092A1 (de) 1986-01-02
DE3423094A1 (de) 1986-01-02

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