EP0854756A1 - Dispositif de regulation de debit de liquide pour systeme de peinture au pistolet - Google Patents

Dispositif de regulation de debit de liquide pour systeme de peinture au pistolet

Info

Publication number
EP0854756A1
EP0854756A1 EP96925948A EP96925948A EP0854756A1 EP 0854756 A1 EP0854756 A1 EP 0854756A1 EP 96925948 A EP96925948 A EP 96925948A EP 96925948 A EP96925948 A EP 96925948A EP 0854756 A1 EP0854756 A1 EP 0854756A1
Authority
EP
European Patent Office
Prior art keywords
container
pressure
fluid
fluid supply
spraying equipment
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.)
Withdrawn
Application number
EP96925948A
Other languages
German (de)
English (en)
Inventor
Alf Sunde
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.)
ABB Flexible Automation AS
Original Assignee
ABB Flexible Automation AS
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 ABB Flexible Automation AS filed Critical ABB Flexible Automation AS
Publication of EP0854756A1 publication Critical patent/EP0854756A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/20—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of weight, e.g. to determine the level of stored liquefied gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
    • B05B13/0431—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation with spray heads moved by robots or articulated arms, e.g. for applying liquid or other fluent material to 3D-surfaces

Definitions

  • the invention relates to a supply system for liquids and suspensions for spray painting and coating applications with dosing and regulation capabilities.
  • Spray painting and coating with water based suspensions of anorganic matter as enamel, glazing, metal flake based electrostatic shielding or fiuidized powders are normally performed by using a storage container, pressurized by air.
  • the pressure is used for pumping the fluid to the spraying equipment, the use of pumps with moving parts being avoided due to the abrasive character of these fluids.
  • the fluid level in the container is lowered gradually.
  • a pressure regulator is compensating for this, maintaining constant working pressure.
  • a spraying process for an object normally lasts 20 - 60 seconds, and within this time, every painting stroke lasts for about 0.5 - 2 seconds.
  • the fluid volume for each painting stroke is the product of its duration and the volume flow rate.
  • the fluid volume for each painting stroke can be regulated by both changing its duration and by varying the volume flow rate which depends on the pressure.
  • fluid containers which for a normal spray painting application could be in the range of 100-200 1 volume, it is a problem to vary the pressure in the container in order to control the volume flow rate individually for each painting stroke due to the large volumes of air and fluid.
  • Another solution is based on hose pumps in combination with compensators and long pipes aimed for damping and cancellation of the pressure pulsations originated by the hose pump.
  • This solution has the disadvantages of being complicated and having long response time due to the length of the liquid path through the equipment. Also, the hose in the hose pump is worn by abrasive emulsions.
  • a further problem in spraying fluids as suspensions of solid matter is the supervising of their density.
  • separation e g due to gravity
  • the painting results become unsatisfactory, and thus a fast and reliable detection of density variations is needed.
  • Dynamic methods for density measuring of flowing liquid, e g based on the Coriolis force have low accuracy and need calibration. Density variations sufficient to result in inferior painting quality can remain undetected by those methods.
  • the invention makes it possible both to control the volume flow rate flow individually for each painting stroke and to determine the fluid density accurately.
  • the basic idea of the invention is to place a small container between the large container (or another type of fluid main supply) and the spraying equipment, the small container being sufficiently small to allow for fast individual pressure adjustments for every painting stroke.
  • This small container is equipped with an inlet valve, a pressure regulator, level control sensors and a weight sensor. Through the pressure regulator the small container is connected to a pressurized air supply.
  • the dosing of the fluid from the small container to the spaying equipment is performed by controlling the air pressure at the top of the container.
  • the volume flow rate is a monotonously increasing function of that pressure.
  • the actual volume flow rate assuming a known and constant fluid density, calculated as proportional to the time rate of weight change of the container, measured by the weight sensor. In a closed loop control system this actual volume flow rate is compared with the wanted volume flow rate and continuously adjusted by performing the proper pressure changes.
  • the flow rate is controlled only by pressure without feedback from the weight measurement.
  • the fluid level in the small container is held between a top and a bottom level.
  • the air pressure at the top of the small container is corrected for the varying hydrostatic pressure contribution for different heights of the spraying equipment. This is of special importance for spraying suspension type fluids with low pressure, where the hydrostatic pressure can be a significant fraction of the total pressure, without correction resulting in large volume flow changes and poor painting quality. Also the compressibility of air is taken into account and corrected for.
  • Separation between the solid and the liquid constituents of the fluid or air entrainment into the fluid can be effectively controlled by the invention.
  • the fluid density can be calculated, as the volume difference between highest and lowest filling level is known and constant. If a deviation from the expected value occurs due to e g separation or air entrainment, an alert can be given in order to take proper action such as stopping of the painting process.
  • This density measuring by checking the weight of a known fluid volume is more accurate and reliable than dynamic measurings based on liquid speed and/or acceleration, as e g Coriolis force based methods.
  • the pressure in the small container may be higher than the fluid supply pressure.
  • the invention also works as a pressure amplifier, and for safety reason a check valve is installed in the supply line.
  • the supply pressure is 2 - 4 bar whereas the pressure in the small container may be up to the maximum pressure of the pressurized air, often 10 bar.
  • the small container needs some control volume resulting in typical sizes of one or a few litres.
  • the invention solves the task of fast and reliable control of the painting fluid to paint spaying equipment handled by robots, especially for fluids which as suspensions are difficult to dose by conventional control means.
  • parameters as speed, quality and degree of automation of painting and coating processes involving these fluids are improved by the invention.
  • the fluid usually a water based suspension or a fiuidized powder, is supplied from the fluid supply 1 which can be a large container pressurized by air or some kind of pump connected to a fluid storage or fluid preparation unit. It passes into a small container 2 with a volume of normally a few litres through the valve 3.
  • the fluid level in the container is measured by the weight sensor 4 which controls the valve 3 maintaining the fluid level 5 between preset maximum and minimum values, sensed by the top level sensor 6a and the bottom level sensor 6b, respectively.
  • the volume flow rate to the paint spraying equipment 7 through the outlet 8 at the bottom of the container is determined by the pressure in the container. It is measured by the pressure sensor 9 which is connected to the control unit 10 which controls the regulator 11 on the pressurized air supply 12.
  • the control unit calculates the actual volume flow rate from the weight change rate measured by the weight sensor 4 and continuously adjusts the pressure for achieving the wanted volume flow rate, compensating for the hydrostatic pressure related to the height of the spraying equipment 7.
  • the control unit also performs corrections for the compressibility of the pressurized air.
  • the container 2 is connected by supporting means 13 to a bearing structure 14.
  • the supporting means 13 allow the movement of the container 2 which is needed for proper function of the weight sensor 4.
  • a check valve 15 is placed on the supply line before the valve 3.
  • the control unit calculates and applies the pressure which is needed for the desired volume flow rate in a painting stroke with compensation for the hydrostatic pressure due to gravity and related to the height of the spraying equipment above the floor.

Abstract

Système robotisé comprenant un dispositif d'alimentation en liquide conçu pour des systèmes de peinture et de revêtement au pistolet et comportant des moyens d'alimentation en liquide servant à alimenter en liquide un équipement de pulvérisation (7), ainsi que des moyens de régulation de débit servant à réguler le débit volumique du liquide alimentant l'équipement de pulvérisation, ledit moyen de régulation de débit comprenant un réservoir (2) situé dans le conduit d'alimentation de l'équipement de pulvérisation, un moyen d'alimentation en gaz sous pression (12) servant à mettre ledit réservoir sous pression et des moyens de régulation de pression (9, 10, 11) servant à réguler le débit volumique en modifiant la pression du gaz.
EP96925948A 1995-10-20 1996-08-19 Dispositif de regulation de debit de liquide pour systeme de peinture au pistolet Withdrawn EP0854756A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9503689 1995-10-20
SE9503689A SE514375C2 (sv) 1995-10-20 1995-10-20 Vätskereglering för sprutmålningsapplikationer
PCT/IB1996/000819 WO1997014505A1 (fr) 1995-10-20 1996-08-19 Dispositif de regulation de debit de liquide pour systeme de peinture au pistolet

Publications (1)

Publication Number Publication Date
EP0854756A1 true EP0854756A1 (fr) 1998-07-29

Family

ID=20399899

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96925948A Withdrawn EP0854756A1 (fr) 1995-10-20 1996-08-19 Dispositif de regulation de debit de liquide pour systeme de peinture au pistolet

Country Status (5)

Country Link
EP (1) EP0854756A1 (fr)
AU (1) AU6628896A (fr)
CA (1) CA2235338A1 (fr)
SE (1) SE514375C2 (fr)
WO (1) WO1997014505A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1034109A4 (fr) * 1997-10-27 2002-03-20 C H & I Tech Inc Dispositif de reapprovisionnement automatique pour recipient a fluide
DE29804955U1 (de) * 1998-03-19 1998-12-24 Steinhauser Lothar Dosiergerät für pulverförmiges Kolbenschmiermittel
DE19937606A1 (de) 1999-03-29 2000-10-12 Steag Hamatech Ag Verfahren und Vorrichtung zum Bereitstellen eines Fluids aus einem Drucktank
NL2005787C2 (nl) * 2010-11-30 2012-06-04 Blue Nederland B V Materiaalafgifte-inrichting, materiaalafgiftesysteem en werkwijze voor het gestuurd aan een object afgeven van een materiaal.
DE102016213487A1 (de) * 2016-07-22 2018-01-25 Bayerische Motoren Werke Aktiengesellschaft Pumpsystem
DE102017113756B4 (de) 2017-06-21 2022-01-27 Poppe+Potthoff Maschinenbau GmbH Verfahren und Vorrichtung zur Druckprüfung von beliebigen Prüflingen, deren Volumen mit einer Flüssigkeit gefüllt wird
DE102018209858A1 (de) * 2018-06-19 2019-12-19 WAHL Engineering GmbH Vorrichtung zur mengendosierten Sprühstoffabgabe in Form eines Sprays

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2609252B1 (fr) * 1987-01-02 1989-04-21 Sames Sa Installation de projection de produit de revetement tel que par exemple une peinture et notamment installation de projection electrostatique de peinture a base d'eau
US5474609A (en) * 1992-06-30 1995-12-12 Nordson Corporation Methods and apparatus for applying powder to workpieces
FR2703266B1 (fr) * 1993-04-01 1995-06-23 Sames Sa Machine de projection de produit de revêtement.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9714505A1 *

Also Published As

Publication number Publication date
SE514375C2 (sv) 2001-02-19
AU6628896A (en) 1997-05-07
SE9503689D0 (sv) 1995-10-20
SE9503689L (sv) 1997-04-21
CA2235338A1 (fr) 1997-04-24
WO1997014505A1 (fr) 1997-04-24

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