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EP0395790A2 - Drehende Sprühpistolenanordnung - Google Patents

Drehende Sprühpistolenanordnung Download PDF

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Publication number
EP0395790A2
EP0395790A2 EP89112108A EP89112108A EP0395790A2 EP 0395790 A2 EP0395790 A2 EP 0395790A2 EP 89112108 A EP89112108 A EP 89112108A EP 89112108 A EP89112108 A EP 89112108A EP 0395790 A2 EP0395790 A2 EP 0395790A2
Authority
EP
European Patent Office
Prior art keywords
air
paint
pressure air
low pressure
gun
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Withdrawn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
EP89112108A
Other languages
English (en)
French (fr)
Other versions
EP0395790A3 (de
Inventor
John W. Hufgard
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.)
Accuspray Inc
Original Assignee
Accuspray 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 Accuspray Inc filed Critical Accuspray Inc
Publication of EP0395790A2 publication Critical patent/EP0395790A2/de
Publication of EP0395790A3 publication Critical patent/EP0395790A3/de
Withdrawn legal-status Critical Current

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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
    • 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
    • B05B7/0081—Apparatus supplied with low pressure gas, e.g. "hvlp"-guns; air supplied by a fan
    • 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
    • B05B12/02—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery
    • 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
    • B05B13/0421—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 rotating spray heads
    • 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
    • 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
    • B05B7/12—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages
    • B05B7/1254—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means being fluid actuated
    • B05B7/1263—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means being fluid actuated pneumatically actuated
    • 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
    • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
    • B05B7/0884—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point the outlet orifices for jets constituted by a liquid or a mixture containing a liquid being aligned

Definitions

  • This invention relates to a plurality of paint spray guns mounted on a rotatable arm for automatically controlling spray painting of objects and the paint and air supply systems for accomplishing the desired result.
  • the paint spray gun In such environments, the paint spray gun must always be arranged adjacent to and facing the surface to be painted and there is an optimum spacing between the nozzle and the surface to be painted.
  • the optimum spacing decreases with the increase in atomizing air pressure, partially because of the angle subtended by the spray. Accordingly, if there is an object to be painted which has an irregular surface, such as an automobile body or the inside of some container, the robot arm needs to maneuver the paint spray gun to a number of different positions. Also, the more irregular the surface to be painted combined with high atomizing air pressure can cause almost unpredictable turbulence and a resulting loss of misdirected paint.
  • Having two spray guns mounted on a single robot arm is known in the prior art.
  • the object of having more than one spray gun or spray nozzle on the end of a robot arm is to minimize movement and orientation of the gun to successive spray orienta­tions or the spray guns may have a uniform spray pattern for each gun but each gun may have a different spray pattern than the other one mounted on the same arm. Thereby, one spray gun may spray a thin line while the other sprays an oval pattern.
  • a robot arm bearing two or more spray guns is mounted to allow the robot arm to be oriented by computer program controls which are known in the industry and not a part of this inven­tion.
  • the spray guns involved are specifically structured to use low pressure high volume air to atomize paint and control spray patterns to thereby minimize paint contamination of the atmosphere and wasted paint.
  • Using low pressure high volume air and a laminar flow of the paint atomizing air exiting the nozzle results in a more confined pattern of paint spray leaving the nozzle and thereby, the control of the paint spray is simplified. With low pressure air there is less of a tendency to have transient spray patterns at irregular surfaces.
  • the system also uses high pressure low volume air as a controlling devise in the spray guns and the reason for the high pressure is to more accurately control the onset and termination of paint through a needle valve at the outlet end of the spray gun nozzle.
  • High pressure (above about 15 psi) is transmitted by pressure waves relatively quickly from the high pressure air supply to the spray gun.
  • the preferred range of high pressure air is in the range 50-150 psi but could be as high as 200 psi.
  • the high pressure low volume air is used as a control mechanism rather than paint atomizing or a spray pattern control. It may be used to control the opening and closing of the needle valve of the paint supply and/or it may be used to control the air feed to the spray pattern adjusting orifices mounted adjacent the outlet end of the spray gun downstream of where the paint has been atomized.
  • a computer controlled robot arm 10 includes a plurality of paint spray guns mounted on a cross-arm at one end and a housing 12 on the other end.
  • the housing 12 encloses a motor and computer control system 14 configured to orient the robot arm 10 in a desired position, it includes a sprocket drive 16 mounted on a shaft 18 which drives an endless chain 20 around another sprocket 22 surrounding the arm 10.
  • the upper end of the arm 10 includes a head 24 having radially opening apertures into fluid transmitting ducts 26, 28, 30 and 32.
  • the number of ducts in arm 10 is limited by the cross-sectional area of arm 10 and the needed volume of fluid which must be conveyed through the ducts.
  • a paint supply 34 is schematically illustrated as being connected directly to duct 26.
  • a high pressure low volume air supply 36 is connected to duct 30 through a regulator 38, which may be a solenoid valve, and the regulator is con­trolled through a mechanism 40 such as a computer or perhaps a lever or trigger controlled mechanism relating to assembly line movement.
  • the robot arm 10 is mounted in appropriate bearings 42 as it passes through an aperture in the housing 12. This allows the housing to remain stationary while the robot arm 10 rotates about a vertical axis.
  • the reference to a "vertical axis" is for convenience and relates to the orientation of Figs. 1 and 2 in the drawings accompanying this application. It is obvious that the orientation of the robot arm could be swung through a vertical plane of 360° if desired.
  • Circumscribing the arm 10 after it passes downward through bearings 42 is a cylindrical manifold 44 specifically structured to dispense low pressure high volume air from a low pressure air supply 46.
  • the drawings illustrate three inlet openings 48, 50 and 52 entering the manifold 44 for subsequent distribution as will be discussed in more detail subsequently.
  • Air entering the manifold 44 through opening 48 will be sealed off from other parts of the manifold by a circular wall 54.
  • Wall 54 is securely mounted on arm 10 to rotate with the arm, however, the cylindri­cal manifold 44 is securely mounted on a plate 56 which in turn is securely mounted to the stationary housing 12. Therefore, the manifold 44 does not rotate when arm 10 rotates but wall 54 does rotate.
  • a sliding seal 58 is mounted between wall 54 and manifold 44 to prevent the escape of air. Because the high volume low pressure air entering the manifold from supply 46 is at such a low pressure, the quality of the seal 58 does not have to be particularly significant.
  • the low pressure high volume air supplied by source 46 should be a pressure less than 15 psi and preferably in the range 7-10 psi. As indicated previously, the high pressure low volume air supply 36 supplies air above 15 psi and preferably in the range 50-150 psi.
  • air entering manifold 44 through inlet 48 will exit in a downward direction through a tube 60.
  • air entering manifold 44 through inlet 50 will exit through a tube 62.
  • Fig. 3 shows six tubes to dispense air from the manifold. Whether there are six tubes to serve six inlets to the manifold or ten tubes to serve five inlets to the manifold is a matter of design by the user and will depend on how many spray nozzles he intends to use on the lower end of the robot arm. As stated earlier, there is no known mechanical reason to place a limit on the number of air feeding tubes.
  • hose 64 air dispensed through tube 60 is transmitted by hose 64 to a first spray gun indicated generally at 66 and illustrated in cross-­section in Fig. 4.
  • Hose 64 is connected to an inlet 68 in gun 66 and will then pass through a first flow path 70 to a chamber around a nozzle 72 where it serves to atomize paint discharged through a needle valve 74 at outlet orifice 75.
  • paint from paint supply 34 is delivered through duct 26 and conveyed by a hose 76 to a paint inlet 78 in gun 66 to feed paint into a channel 79 leading to the needle valve 74.
  • the high pressure low volume air supply 36 supplies air to duct 30 and subsequently to a hose 80 which delivers the air through an inlet 81 in the spray gun of Fig. 4 and serves to start and stop paint flow through the needle valve 74.
  • An application of pressure by the high pressure supply 36 through inlet 81 into gun 66 will cause the piston 82 in cylinder 83 to retract or move to the left as illustrated in Fig. 4 which will in turn adjust the needle 84 which controls the volume of paint flowing through the needle valve 74 and nozzle 72.
  • Air is supplied to spray gun 66 to control the pattern of the spray exiting nozzle 72 and it is supplied from the manifold 44 through a tube 86 and subsequently through hose 88 to an inlet 90 leading into the gun 66. Air through inlet 90 moves through a second flow path 92 to one or more orifices 94. Orifices 94 are specifically located and oriented downstream of the nozzle 72 to impinge on the oval spray pattern of the atomized paint and to compress it into the desirable spray pattern. What constitutes a desirable spray pattern depends upon the object to be sprayed and the provision of orifices to correspond with the control mechanism turning the spray pattern control air on and off. The flow of air to the pattern control orifices is completely controlled by the operator during the process even though that operator may be a computer program.
  • Fig. 1 shows only two spray guns and both are oriented in the same direction and both are mounted on a cross-bar 102. This is purely for illustration and there could be two cross-bars or ten cross-bars depending on the needs of the particular robot arm.
  • Fig. 1 also illustrates two different kinds or models of spray guns and it is possible that two different spray guns could be mounted on cross-bar 102. However, two spray guns identical to spray gun 66 might be appropriate. On the other hand, the operator could use two spray guns such as 104 il­lustrated in Fig. 5 on cross-arm 102.
  • spray gun 104 includes a control mechanism for controlling the flow of high volume low pressure air to the spray pattern control orifices 94. This is accomplished by a housing 105 attached to spray gun 104 and connecting the hose 88 to pass through inlet 90. Inlet 90 directs the air into a passage 106 within housing 105 which may be blocked by a piston 108.
  • Piston 108 reciprocates in a cylinder 110 in response to a high pressure low volume air supply which feeds to inlet 112 and may retract the piston 104 by pressure in cylinder 110 applied against the C-­shaped seal 114.
  • the cross-sectional area of the seal 114 and its mechanical backing is greater than the cross-sectional area of the backside of piston 108.
  • the spray pattern of a conventional prior art nozzle will have a greater cross-sectional area at every distance from the spray gun than will the spray of this invention involving low pressure high volume air when measured at the same distance from the spray gun.
  • the guns of the instant invention may be located further from the object to be spray painted and still concentrate the paint in a more limited area. Thereby, there is less random turbulent air flow from the guns of the instant invention and thereby less paint is lost from the paint booth and less paint must be filtered from the air to prevent external pollution.
  • the guns of this invention may be located even closer to the surface to be painted than prior art spray guns because there will be less of a reflected air blast from the surface.

Landscapes

  • Engineering & Computer Science (AREA)
  • Robotics (AREA)
  • Spray Control Apparatus (AREA)
  • Nozzles (AREA)
EP19890112108 1989-05-05 1989-07-03 Drehende Sprühpistolenanordnung Withdrawn EP0395790A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US35201189A 1989-05-05 1989-05-05
US352011 1989-05-05

Publications (2)

Publication Number Publication Date
EP0395790A2 true EP0395790A2 (de) 1990-11-07
EP0395790A3 EP0395790A3 (de) 1991-07-24

Family

ID=23383418

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890112108 Withdrawn EP0395790A3 (de) 1989-05-05 1989-07-03 Drehende Sprühpistolenanordnung

Country Status (1)

Country Link
EP (1) EP0395790A3 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4242715A1 (en) * 1991-12-17 1993-06-24 Krautzberger Gmbh Adaptor with regulator valve for automatic sprayers - has two crossing bores for valve, one for material feed tube connected to feed and return channels
US5267693A (en) * 1992-02-12 1993-12-07 Dickey Barry A Spray gun non-stick paint connector block
FR2737980A1 (fr) * 1995-08-23 1997-02-28 Sames Sa Procede et dispositif de projection de produit de revetement
FR2770155A1 (fr) * 1997-10-28 1999-04-30 Cergi Sa Installation et procede de pulverisation automatique de pieces et/ou de parties de pieces, notamment de petites pieces
EP2500104A1 (de) * 2011-03-18 2012-09-19 Faurecia Bloc Avant Vorrichtung zur Zerstäubung von Farbe, und Anwendungsverfahren einer solchen Vorrichtung
EP3106424A4 (de) * 2014-02-11 2017-09-13 Taller Autorema, s.l. Schnelle verklebungseinheit für behälterdeckel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3653599A (en) * 1970-05-19 1972-04-04 Speco Inc Fluid spray apparatus
FR2180201A5 (de) * 1972-04-10 1973-11-23 Descos Rene
FR2259644A1 (de) * 1974-02-01 1975-08-29 Farnsteiner Irmgard
US4228958A (en) * 1979-07-27 1980-10-21 General Motors Corporation Air-operated spray device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3653599A (en) * 1970-05-19 1972-04-04 Speco Inc Fluid spray apparatus
FR2180201A5 (de) * 1972-04-10 1973-11-23 Descos Rene
FR2259644A1 (de) * 1974-02-01 1975-08-29 Farnsteiner Irmgard
US4228958A (en) * 1979-07-27 1980-10-21 General Motors Corporation Air-operated spray device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4242715A1 (en) * 1991-12-17 1993-06-24 Krautzberger Gmbh Adaptor with regulator valve for automatic sprayers - has two crossing bores for valve, one for material feed tube connected to feed and return channels
DE4242715C2 (de) * 1991-12-17 2000-05-31 Krautzberger Gmbh Adapter mit Regelventil für automatische Material-Spritzvorrichtung
US5267693A (en) * 1992-02-12 1993-12-07 Dickey Barry A Spray gun non-stick paint connector block
FR2737980A1 (fr) * 1995-08-23 1997-02-28 Sames Sa Procede et dispositif de projection de produit de revetement
FR2770155A1 (fr) * 1997-10-28 1999-04-30 Cergi Sa Installation et procede de pulverisation automatique de pieces et/ou de parties de pieces, notamment de petites pieces
EP2500104A1 (de) * 2011-03-18 2012-09-19 Faurecia Bloc Avant Vorrichtung zur Zerstäubung von Farbe, und Anwendungsverfahren einer solchen Vorrichtung
FR2972651A1 (fr) * 2011-03-18 2012-09-21 Faurecia Bloc Avant Dispositif de pulverisation de peinture et procede de mise en oeuvre d'un tel dispositif.
EP3106424A4 (de) * 2014-02-11 2017-09-13 Taller Autorema, s.l. Schnelle verklebungseinheit für behälterdeckel

Also Published As

Publication number Publication date
EP0395790A3 (de) 1991-07-24

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