EP0396223A2 - Procédé et appareil pour chasser la peinture résiduelle de passages internes d'un système de distribution de peinture - Google Patents

Procédé et appareil pour chasser la peinture résiduelle de passages internes d'un système de distribution de peinture Download PDF

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Publication number
EP0396223A2
EP0396223A2 EP90301948A EP90301948A EP0396223A2 EP 0396223 A2 EP0396223 A2 EP 0396223A2 EP 90301948 A EP90301948 A EP 90301948A EP 90301948 A EP90301948 A EP 90301948A EP 0396223 A2 EP0396223 A2 EP 0396223A2
Authority
EP
European Patent Office
Prior art keywords
conduit
internal flow
flow passage
coating material
metering
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Withdrawn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
EP90301948A
Other languages
German (de)
English (en)
Other versions
EP0396223A3 (fr
Inventor
Roger Cann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Duerr Inc
Original Assignee
Behr Industrial Equipment Inc
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 Behr Industrial Equipment Inc filed Critical Behr Industrial Equipment Inc
Publication of EP0396223A2 publication Critical patent/EP0396223A2/fr
Publication of EP0396223A3 publication Critical patent/EP0396223A3/fr
Withdrawn legal-status Critical Current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
    • B05B16/00—Spray booths

Definitions

  • the subject invention relates generally to a method and apparatus for cleansing residual paint from the internal flow passages in an automated paint distribution system, and more particularly to the automated electrostatic spray coating art wherein a paint distribution system must be cleansed before a different color of paint is supplied to the sprayer.
  • each vehicle body is typically coated with a different color of paint than the preceding vehicle body. Therefore, a complete flushing of the paint distribution is required prior to application of the new paint color.
  • the time required to change colors determines the through rate of workpieces, i.e., the conveyor speed and distance between workpieces conveyed past a paint spraying system.
  • United States Patent Number 3,348,774 to Wiggins, issued October 24, 1967, is exemplary of the above-described method for flushing residual paint from a paint distribution system wherein a flow of compressed air is first moved through the internal flow passages in the distribution system, followed by a stream of solvent, which, in turn, is followed by another stream of compressed air.
  • United States Patent Number 3,477,870 to Boretti et al, issued November 11, 1969 discloses a residual paint flushing method wherein liquid solvent is first moved through the internal flow passages of the distribution system, followed by a flow of high pressure air.
  • a cleaning apparatus of the type for removing residual coating material from flow passages in a paint distribution system comprises conduit means defining an internal flow passage for conveying coating material to a spraying device, a liquid supply means for supplying a liquid cleaning medium to the internal flow passage of the conduit means, and a gas supply means for supplying pressurized gas into the internal flow passage of the conduit means.
  • the subject invention is characterized by including an injection means for simultaneously injecting an atomized spray of the liquid cleaning medium and the pressurized gas into the internal flow passage to remove residual coating material.
  • the subject invention also contemplates a method for removing residual coating material from flow passages in a paint distribution system comprising the steps of moving a liquid cleaning medium through a conduit, moving a pressurized gas through the conduit, and characterized by atomizing the liquid cleaning medium into a spray and mixing the spray with the pressurized gas in the conduit to remove residual coating material.
  • the subject invention achieves superior flushing results by atomizing the liquid solvent and moving that atomized solvent with the compressed air through the internal flow passages in the conduit means of the paint distribution system.
  • the improved efficiency provided by the high pressure atomized solvent flow translates into a substantial reduction in the amount of solvent required to effectively clean the paint distribution system, and also a substantial reduction in the amount of time required to complete the cleaning process.
  • a cleaning apparatus according to the subject invention is generally shown at 10.
  • the cleaning apparatus 10 is particularly adapted for removing residual coating material, e.g., paint, from flow passages in a paint distribution system, generally indicated at 12.
  • the paint distribution system 12 is particularly suited for use in the automated spray coating of workpieces, e.g., vehicle bodies, which are conveyed along a predetermined path.
  • workpieces e.g., vehicle bodies
  • a vehicle body is shown in phantom at 14 in Figure 3.
  • the subject apparatus 10 comprises a conduit means, generally indicated at 16, which defines at least one internal flow passage 18.
  • the conduit means 16 conveys paint from a supply to a sprayer means, generally indicated at 20.
  • the sprayer means 20 receives a flow of paint from the conduit means 16 for discharging the paint onto the vehicle body 14.
  • a spray booth 21 is shown in Figure 3 and defines an isolated internal spray zone in which the conduit means 16 and the sprayer means 20 are disposed.
  • a liquid supply means is generally indicated at 22 in Figures 1-3 for supplying a liquid cleaning medium, i.e., a paint solvent, into the internal flow passage 18 of the conduit means 16.
  • a gas supply means is generally indicated at 24 in Figures 1-3 for supplying pressurized gas, preferably air, into the internal flow passage 18 of the conduit means 16. Therefore, the liquid supply means 22 provides the solvent, and the gas supply means 24 provides the air, which, together, are moved through the internal flow passage 18 of the conduit means 16 to flush residual paint from the paint distribution system 12 before a new color of paint is introduced.
  • the subject apparatus 10 is characterized by including an injection means, generally indicated at 26 in Figures 1-3, for simultaneously injecting an atomized spray of the liquid solvent and the pressurized air into the internal flow passage 18 to efficiently remove any residual paint.
  • an injection means generally indicated at 26 in Figures 1-3
  • the atomized solvent is rapidly moved through the internal flow passage 18 and functions to remove residual paint in much the same manner as in a sand blasting operation.
  • the combination of the atomized solvent and compressed air moving through the internal flow passage 18 of the conduit means 16 functions as both an abrasive type cleaner wherein the physical effects of the rapidly moving solvent particles chip away at the residual paint, and also as a chemical cleaner wherein the solvent dissolves the residual paint and flushes it from the internal flow passage 18.
  • the injection means 26 includes a gas actuation means, generally indicated at 28 in Figure 1, which is associated with the liquid supply means 22 and supplied with pressurized gas from the gas supply means 24.
  • the gas actuation means 28 forces the liquid cleaning medium into the internal flow passage 18 simultaneously with the pressurized gas injection from the gas supply means 24.
  • the gas actuation means 28 includes an air cylinder 30 in communication with the gas supply means 24.
  • An air pressure responsive piston 32 is slideably disposed in the air cylinder 30 and is responsive to the pressurized gas from the gas supply means 24.
  • the air piston 32 is a plate-like member having a resilient peripheral lip 34 biased radially outwardly to engage the inner cylindrical wall of the air cylinder 30.
  • the air cylinder 30 extends axially between an end wall 36 and a connecting wall 38.
  • the air piston 32 therefore, is axially moveable within the air cylinder 30 between the end wall 36 and the connecting wall 38, and resembles a conventional positive displacement piston/cylinder assembly.
  • a gas supply valve 40 is disposed between the gas supply means 24 and the air cylinder 30 for selectively communicating pressurized gas to the interior of the air cylinder 30.
  • the gas supply valve 40 is fixedly attached to and extends through the center of the end wall 36.
  • a pressurized gas flow tube 42 extends from the gas supply valve 40 and communicates with the gas supply means 24.
  • the gas supply valve 40 is pneumatically actuated from a control 43 outside the spray booth 21 for allowing compressed air to enter the air cylinder 30 at predetermined times in the coating cycle of the paint distribution system 12.
  • the gas actuation means 28 further includes a metering cylinder 44 which is in communication with the liquid supply means 22 for measuring a predetermined volume of solvent to be injected into the internal flow passage 18.
  • a metering piston 46 is slideably disposed in the metering cylinder 44 in much the same manner as the air piston 32.
  • the metering piston 46 includes a peripheral annular lip 48 biased radially outwardly toward the inner wall of the metering cylinder 44.
  • the metering cylinder 44 is integral with the air cylinder 30 and extends axially from the connecting wall 38 of the air cylinder 30.
  • the metering piston 46 is moveable within the metering cylinder 44 between the connecting wall 38 and a forward end of the metering cylinder 44.
  • a liquid supply valve 50 is disposed between the liquid supply means 22 and the metering cylinder 44 for injecting liquid solvent into the metering cylinder 44. More particularly, as best shown in Figure 1, the liquid supply valve 50 extends radially outwardly from the cylindrical wall of the metering cylinder 44 and includes a liquid flow tube 52 for communicating the liquid solvent from the liquid supply means 22 to the liquid supply valve 50. As will be described in detail subsequently, the liquid supply valve 50 is pneumatically actuated at predetermined times from the control disposed outside the spray booth 21.
  • connection means 54 extends between the air piston 32 and the metering piston 46 for moving one of the pistons in response to the movement of the other. More particularly, as best shown in Figure 1, the connection means 54 comprises a rigid rod 54 extending straight and axially between the air piston 32 and the metering piston 46 and fixedly connected at each end to the respective pistons 32, 46 for allowing movement in unison of the pistons 32, 46.
  • the air cylinder 30 has a first predetermined cross-sectional area taken perpendicular to the longitudinal axis thereof.
  • the metering cylinder 44 has a second predetermined cross-sectional area taken perpendicular to the coincidental longitudinal axis of the air 30 and metering 44 cylinders. As shown in the Figures, the first cross-sectional area is larger than the second cross-sectional area for multiplying the pressure in the metering cylinder 44 relative to air pressure applied to the air cylinder 30.
  • the difference in cross-sectional areas of the air 30 and metering 44 cylinders results in a proportional multiplication of the velocity of the solvent injected from the metering cylinder 44 relative to the velocity of compressed air moving into the air cylinder 30 through the gas supply valve 40.
  • the injection means 26 includes an atomizer nozzle 56 disposed between the second cylinder 44 and the conduit means 12. The accelerated velocity of solvent exiting the metering cylinder 44 is moved through the atomizer nozzle 56 and into the conduit 12 in an atomized state.
  • the conduit means 16 includes an upstream manifold 58 having a plurality of closable fluid inlets 60 to the internal flow passage 18.
  • the manifold 58 is associated with a plurality of fluid mediums to be injected into the internal flow passage 18, such as the above-mentioned solvent and compressed air, as well as numerous paint colors.
  • the manifold 58 is preferably an elongated member having a longitudinally extending passage therethrough defining the internal flow passage 18.
  • a threaded stopper 62 is disposed in one end of the manifold 58, and the conduit means 16 extends from the other end of the manifold 58.
  • Pneumatically actuated valves 64 are associated with each of the inlets 60 to the manifold 58 to selectively allow the injection of a particular paint medium into the internal flow passage 18.
  • six inlets 60 are provided in addition to the two inlets 60 for the solvent and compressed air, it will be appreciated that any number of additional inlets, either more or less, can be provided with the subject apparatus.
  • the conduit means 16 also includes a flow regulator means 66 disposed downstream of the manifold 58 for controlling the volumetric flow rate of paint through the conduit means 16 and to the spraying means 20.
  • the subject flow regulator means 66 is pneumatically operated to actuate a liquid and air impermeable diaphragm supported inside of the housing of the flow regulator means 66.
  • the diaphragm actuates a needle toward and away from a ball valve disposed in a seat to allow more flow through the conduit means 16 by moving the ball away from its seat, and less flow through the conduit means 16 by moving the ball toward its seat.
  • the gas supply means 24 includes a pneumatic main valve 68 responsive to a pneumatic signal for selectively controlling the injection of pressurized gas into the manifold 58.
  • the pneumatic main valve 68 is associated with one of the manifold inlets 60 for communicating with the internal flow passage 18.
  • the paint distribution system 12 awaits a command to initiate the spray coating of a vehicle body 14.
  • the internal flow passage 18 of the conduit means 16 is fully cleansed and ready for the introduction of a predetermined color of paint.
  • one of the paint valves 64 is commanded to open to allow the associated color of paint into the manifold 58 while the remaining paint valves 64, the pneumatic main valve 68 and the injection means 26 remain closed.
  • the paint thus fed into the manifold 58 is moved under pressure through the internal flow passage 18 and into the flow regulator means 66.
  • the liquid paint reaches the sprayer means 20 where it is atomized and electrostatically charged by electrodes disposed in an annular ring 70, as shown in Figure 3.
  • the electrostatically charged paint particles are attracted to the grounded vehicle body 14, and uniformly deposit themselves thereon.
  • the gas supply valve 40 of the injection means 26 is closed while the liquid supply valve 50 is open to allow liquid solvent to enter the metering cylinder 44.
  • the pneumatic valve associated with the metering cylinder 44 remains closed to prevent the liquid solvent from entering the manifold inlet 60 associated therewith.
  • the fluid pressure urges the metering piston 46 rearwardly in the metering cylinder 44, toward the connecting wall 38.
  • appropriate venting must be provided in the air cylinder 30 so that resistance due to trapped air from the air piston 32 will be eliminated.
  • the liquid supply valve 50 is closed and remains closed throughout the entire flushing operation.
  • the pneumatic main valve 68 of the gas supply means 64 will be first opened in order to force out all of the paint trapped in the conduit means 16 between the manifold 58 and the spraying means 20. This paint will typically be collected for reuse. After this operation is complete, the residual coating material which has adhered to the internal flow passage 18 must be removed. With this, the gas supply valve 40 of the injection means 26 and the pneumatic main valve 68 are simultaneously opened, along with the pneumatic valve disposed between the metering cylinder 44 and the inlet 60, so that compressed air is allowed to enter the air cylinder 30 of the injection means 26. This compressed air acts against the air piston 32 to move the air piston 32 axially in the air cylinder 30 toward the connecting wall 38. Accordingly, movement of the air piston 32 also moves the metering piston 46 via the connecting rod 54 to urge the liquid solvent in the metering cylinder 44 into the manifold 58.
  • the solvent expelled from the metering cylinder 44 is first atomized by forcing it through the atomizer nozzle 56.
  • the atomized spray of solvent is then mixed with the pressurized air in the conduit 16.
  • the atomized solvent and the pressurized air are simultaneously injected into the conduit means 16 to efficiently remove the residual paint by both abrasive and chemical cleaning actions.
  • the liquid supply valve 50 is reopened to allow a new quantity of solvent to enter the metering cylinder 44, thus, moving the metering piston 46 axially in the metering cylinder 44. It will appreciated, that the axial placement of the liquid supply valve 50 relative to the metering cylinder 44 must be such that when the metering piston 42 has completed its stroke during the injection of solvent into the manifold 58, the liquid supply valve 50 remains in a position to inject the solvent on the liquid-contacting face of the metering piston 46.
  • the injection of atomized solvent into the internal flow passage 18 of the paint distribution system 12 is highly advantageous in that a smaller quantity of liquid solvent is required to remove the residual coating material, and the time required for the flushing process is thereby substantially reduced. Additionally, by injecting the liquid solvent into the conduit means 16 at a greater pressure than the pressure of the compressed air in the gas supply means 24, there is never the threat that the high pressure compressed air will cause a back-up in the liquid solvent supply line 52.

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  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
  • Nozzles (AREA)
  • Coating Apparatus (AREA)
EP19900301948 1989-05-01 1990-02-23 Procédé et appareil pour chasser la peinture résiduelle de passages internes d'un système de distribution de peinture Withdrawn EP0396223A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US34536789A 1989-05-01 1989-05-01
US345367 1989-05-01

Publications (2)

Publication Number Publication Date
EP0396223A2 true EP0396223A2 (fr) 1990-11-07
EP0396223A3 EP0396223A3 (fr) 1991-09-04

Family

ID=23354759

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900301948 Withdrawn EP0396223A3 (fr) 1989-05-01 1990-02-23 Procédé et appareil pour chasser la peinture résiduelle de passages internes d'un système de distribution de peinture

Country Status (4)

Country Link
EP (1) EP0396223A3 (fr)
JP (1) JPH0757333B2 (fr)
AU (1) AU612926B2 (fr)
CA (1) CA2010656C (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0568910A1 (fr) * 1992-05-04 1993-11-10 ABB Fläkt Ransburg GmbH Procédé et dispositif de nettoyage d'une installation de revêtement
US5872299A (en) * 1990-11-19 1999-02-16 G. D. Searle & Co. Method of preparing intermediates for retroviral protease inhibitors
WO2003089778A1 (fr) * 2002-04-19 2003-10-30 Marioff Corporation Oy Procede et appareil associes a un appareil de pulverisation
FR2906262A1 (fr) * 2006-09-27 2008-03-28 Ajlit Ressources Soc Par Actio Installation et procede de traitement de surface
CN114918077A (zh) * 2022-06-28 2022-08-19 博众精工科技股份有限公司 清胶机构及点胶设备
US11964070B2 (en) 2020-06-09 2024-04-23 Quin Global US, Inc. Disinfectant and sanitizer canister system and metering device for system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987006324A1 (fr) * 1986-04-10 1987-10-22 Georges Stutzmann Appareil pour l'entretien d'outils pneumatiques
EP0294690A2 (fr) * 1987-06-12 1988-12-14 International Business Machines Corporation Pulvérisateur pour liquide de nettoyage et sa méthode d'utilisation
US4881563A (en) * 1986-09-05 1989-11-21 General Motors Corporation Paint color change system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3155539A (en) * 1958-11-20 1964-11-03 James W Juvinall Electrostatic spray coating methods and apparatus
US3348774A (en) * 1965-03-18 1967-10-24 Gyromat Corp Semi-automatic color change system for paint spray installation
US3477870A (en) * 1966-03-03 1969-11-11 Gen Motors Corp Method of spray coating a series of articles including the application of different colors to different articles
JPS62132562A (ja) * 1985-12-06 1987-06-15 Toyota Motor Corp 塗装装置
JPS63123460A (ja) * 1986-11-10 1988-05-27 Honda Motor Co Ltd 塗装装置の洗浄方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987006324A1 (fr) * 1986-04-10 1987-10-22 Georges Stutzmann Appareil pour l'entretien d'outils pneumatiques
US4881563A (en) * 1986-09-05 1989-11-21 General Motors Corporation Paint color change system
EP0294690A2 (fr) * 1987-06-12 1988-12-14 International Business Machines Corporation Pulvérisateur pour liquide de nettoyage et sa méthode d'utilisation

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5872299A (en) * 1990-11-19 1999-02-16 G. D. Searle & Co. Method of preparing intermediates for retroviral protease inhibitors
EP0568910A1 (fr) * 1992-05-04 1993-11-10 ABB Fläkt Ransburg GmbH Procédé et dispositif de nettoyage d'une installation de revêtement
WO2003089778A1 (fr) * 2002-04-19 2003-10-30 Marioff Corporation Oy Procede et appareil associes a un appareil de pulverisation
US7353782B2 (en) 2002-04-19 2008-04-08 Marioff Corporation Oy Method and apparatus in a spraying apparatus
FR2906262A1 (fr) * 2006-09-27 2008-03-28 Ajlit Ressources Soc Par Actio Installation et procede de traitement de surface
US11964070B2 (en) 2020-06-09 2024-04-23 Quin Global US, Inc. Disinfectant and sanitizer canister system and metering device for system
CN114918077A (zh) * 2022-06-28 2022-08-19 博众精工科技股份有限公司 清胶机构及点胶设备

Also Published As

Publication number Publication date
AU612926B2 (en) 1991-07-18
CA2010656A1 (fr) 1990-11-01
JPH02303565A (ja) 1990-12-17
EP0396223A3 (fr) 1991-09-04
JPH0757333B2 (ja) 1995-06-21
CA2010656C (fr) 1994-04-19
AU5136090A (en) 1990-11-01

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