EP0216674B1 - Spritzgerät zum Spritzen eines pulverförmigen Stoffes - Google Patents

Spritzgerät zum Spritzen eines pulverförmigen Stoffes Download PDF

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Publication number
EP0216674B1
EP0216674B1 EP86401867A EP86401867A EP0216674B1 EP 0216674 B1 EP0216674 B1 EP 0216674B1 EP 86401867 A EP86401867 A EP 86401867A EP 86401867 A EP86401867 A EP 86401867A EP 0216674 B1 EP0216674 B1 EP 0216674B1
Authority
EP
European Patent Office
Prior art keywords
sprayer according
casing
ejection orifice
cage
nozzle
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
EP86401867A
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English (en)
French (fr)
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EP0216674A1 (de
Inventor
Jean-Yves Correard
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.)
Sames SA
Original Assignee
Sames SA
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Filing date
Publication date
Application filed by Sames SA filed Critical Sames SA
Publication of EP0216674A1 publication Critical patent/EP0216674A1/de
Application granted granted Critical
Publication of EP0216674B1 publication Critical patent/EP0216674B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B05B7/14—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 designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B05B7/144—Arrangements for supplying particulate material the means for supplying particulate material comprising moving mechanical means
    • B05B7/1445—Arrangements for supplying particulate material the means for supplying particulate material comprising moving mechanical means involving vibrations
    • 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
    • B05B7/14—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 designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B05B7/1472—Powder extracted from a powder container in a direction substantially opposite to gravity by a suction device dipped into the powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/18—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid
    • B06B1/186—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid operating with rotary unbalanced masses

Definitions

  • the invention relates to a sprayer of powder coating product and relates more particularly to the improvement of the homogeneity of the powder jet.
  • Powder spraying is used in the most diverse industrial fields such as: insecticide spraying, the dispersion of mineral or organic additives on metal or plastic parts, during their preparation, to modify their characteristics, spraying additives on the surface of food products or the dispersion of hot melt paint powder on objects to be covered, before passing these objects through an oven. All these applications, and in particular the last mentioned, require a relatively homogeneous powder jet.
  • the powder is generally taken from a reservoir where it is maintained in the fluidized state by a gas stream, in practice air, distributed to the lower part of the reservoir, through a porous bottom wall.
  • a calibrated gas jet sent into a Venturi device, enables the gas-pulverulent mixture to be speeded up and transported, over several meters of pipe, to an ejection device or projector, often having the general shape a "pistol", to facilitate handling.
  • inhomogeneous powder projections are sometimes observed, which can be due to several factors such as in particular the concentration of the mixture and its speed of circulation in the pipe.
  • the flow of the mixture is only regular within a certain range of flow speeds, of the order of 7 to 15 m / s. Below a certain lower limit speed, the flow takes place in packets of powder.
  • a low speed flow also promotes powder deposits in the horizontal parts of the pipe and the projector. Thus, when the latter is held substantially horizontally by the user, which is most of the time the case, there is often an accumulation of powder inside the housing of the projector, which promotes inhomogeneous projection or even partial obturation. .
  • European patent document No. 0131 805 describes a powder spraying system of the type set out in the preamble of claim 1. Such a system incorporates a vibrator mounted on the tank where the air-powder mixture takes place. A coil surrounds the pipe connecting the tank to the projector a certain distance from the tank and the vibrator is coupled to this coil so as to avoid the formation of powder agglomerates in the lower part of the pipe, at the outlet of the tank.
  • the teaching of this document does not make it possible to re-homogenize the air-powder mixture on leaving the projector, especially if other bends have formed in the pipe between the tank and the projector.
  • the invention relates to a sprayer of powder coating product
  • a sprayer of powder coating product comprising a housing provided with a nozzle defining an ejection orifice, a section of flexible conduit communicating with the ejection orifice and connected to means for creating and circulating a mixture of gas and of said product and a means for imparting oscillations to said section, characterized in that said flexible pipe section is formed by the end part of a pipe which passes through the housing and opens into the ejection nozzle, said housing further comprising said means for printing oscillations.
  • the means for printing the oscillations on the aforementioned section may for example be a vibrator integral with the latter or an air flow device of the "Vortex" type arranged to impart an oscillating movement to said section.
  • a powder spraying installation comprising a powdered product projector 11 comprising a housing 12 provided at its front part with a nozzle 13 defining an ejection orifice 14.
  • the the housing is further extended at its lower part by a handle 15 or by means of attachment to a robot arm.
  • a pipe 16 is connected to the rear end of the projector. It is intended to convey an air-pulverulent product mixture taken from a reservoir 17 where said pulverulent product is maintained in the fluidized state by a continuous injection of air at the lower part of the reservoir, through a porous bottom wall. 18.
  • the sampling is carried out by means of a device 19 forming a Venturi, interposed between the pipe 16 and a conduit 19a immersed in the tank. Compressed air is injected into the device 19 through an inlet e.
  • the housing 12 contains means for agitating the mixture, located downstream of the ejection orifice 14 and more particularly constituted here by a section 20 of flexible conduit connected to the means for creating and circulating said mixture , described above and by a means for printing oscillations to said section.
  • the section 20 of flexible conduit is simply formed by the end part of the pipe 16 which passes longitudinally through the housing 12 while being immobilized in leaktight manner at its two ends between the rear wall 21 of the housing and the nozzle 13.
  • the means for printing oscillations on the section 20 is here a vibrator 22 mounted floating in the housing 12 and integral with this section 20.
  • the vibrator 22 is, according to the example, a pneumatic ball vibrator 23. It comprises an annular cage 24 surrounding the section and attached to it. The ball 23 is subject to move inside the cage. A very flexible conduit 25 connected to a source of compressed air (not shown) opens into this cage, approximately tangentially, for injecting air therein in a direction suitable for setting the ball in motion in said cage. This movement causes a circular oscillation of the section 20 of flexible conduit and of the cage itself.
  • the amplitude of the vibrations is high in the section 20, the possibly more concentrated powdered nets will follow trajectories induced by the movement, substantially describing propellers whose pitch is defined by the operating conditions, in particular the speed of the mixture and the speed of rotation of the flexible pipe section.
  • the homogeneity of the jet at the outlet will be significantly improved. If the amplitude of the vibrations is low, we will observe a resuspension of the particles and consequently, here again, a better homogeneity of the jet.
  • the two phenomena course deviation and resuspension
  • the projector further comprises a deflector 26, known per se, located in the axial extension of the ejection orifice 14 and mainly intended to burst the jet to give it a desired opening.
  • FIGs 4 and 5 illustrate a variant of the means for printing oscillations on the section 20.
  • the ball vibrator is here replaced by an annular cavity 28 defined in an annular body 29 fixed to the internal wall of the housing.
  • the section 20 of flexible conduit whose outside diameter is significantly less than the internal diameter of the annular body 29, passes axially through the latter.
  • the cavity 28 communicates by a pipe 30 with a source of compressed air, not shown.
  • the internal side wall 31 of the body 29 is pierced with holes 32 regularly distributed circumferentially in a plane and opening in an inclined manner in the direction of the flexible duct section.
  • This arrangement gives rise to a vortex circulation of the air leaving the cavity 28, of the Vortex type, causing a circular oscillation of the section 20 according to a mode analogous to that of the example in FIG. 1.
  • This arrangement presents the advantage of allowing a more compact housing to be produced for a given oscillation amplitude of the flexible duct section.
  • the air exiting from the ball vibrator can be reused to supply another arrangement capable of defining a vortex type vortex circulation but this time defined at the front of the housing, in the vicinity of the nozzle 13, for example by a set of holes 35 regularly distributed circumferentially tangent to a cylinder and inclined by relative to the axis, that is to say practically in the form of propeller portions, to allow the air to escape towards the outside, at the rear of the nozzle, by creating a circulation eddy contributing in a known way to homogenize the powder jet.
  • the efficiency of this arrangement is significantly improved due to the relative homogeneity of the mixture obtained by the implementation of the invention.
  • the holes 35 can also be slightly inclined in the direction of the axis of the powder jet.
  • FIG. 3 represents another variant in which the similar structural elements bear the same numerical references.
  • the nozzle 13 and consequently the ejection orifice 14 have a larger diameter than the external diameter of the section 20 of flexible conduit and the end 20a of the latter is free of movement in the vicinity of the orifice 14.
  • the means for printing oscillations on the section 20 is here the ball vibrator described with reference to Figure 1 but it is obvious that this vibrator can be replaced by the arrangement of Figures 4 and 5.
  • the section of the nozzle 13 and the ejection orifice 14 may be between 2 and 4 times larger than that of the section 20. The operation is similar to that which has been described with reference to FIG.
  • the ejection orifice 14 does not necessarily have a circular contour. This contour can be oblong and such that at least its largest transverse dimension is greater than the diameter of the section 20, this arrangement producing a flatter jet.
  • the means for imparting vibrations to the section 20 has not been shown but may be, for example, a mechanical vibrator similar to that which is described in FIGS. 1 to 3 or a pneumatic system such as that described in FIGS. 4 and 5.
  • the projector is equipped with removable and interchangeable parts facilitating the assembly and disassembly of the section 20, either to allow its replacement when it is used, or to allow it to replace a section of different diameter, depending on the order of magnitude of the flow rates desired by the user.
  • the projector has a removable connection tip 36, arranged in a cavity 37 of its rear wall.
  • This end piece externally comprises a threaded cylindrical part 38 screwed into a corresponding threaded portion of the cavity 37.
  • the threaded part 38 is extended by a frustoconical part 39 which is itself positioned in a frustoconical part complementary to the cavity 37.
  • the frustoconical part 39 is extended by a cylindrical tubular end 40.
  • a channel 41 passes axially through the end piece 36.
  • the end piece 36 is screwed into the cavity 37, the expanded wall of the section 20 ensuring the seal by being compressed between the two aforementioned frustoconical parts.
  • the end piece 36 is also interchangeable with others, different by the diameter of the channel 41 so as to adapt to the diameter of the flexible section chosen.
  • a nozzle 41 also removable and interchangeable, comprising an axial passage 42 suitable for receiving the other end of the flexible duct section 20.
  • This nozzle comprises, externally, a threaded part and is mounted by screwing into the threaded end of the housing. It comes to bear on an internal transverse wall 44 thereof, by means of an annular seal 45 of flexible and deformable material (foam rubber for example) which, by deforming, ensures both the maintenance of the section of flexible pipe in the nozzle, the sealing of the assembly and the damping of the vibrations transmitted by said section to the housing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (11)

1. Spritzgerät zum Spritzen von pulverförmigen Stoffen, mit einem Gehäuse (12), das mit einer eine Ausstoßöffnung begrenzenden Düse versehen ist, mit einem Abschnitt (20) einer biegsamen Leitung, der mit der Ausstoßöffnung und mit Mitteln (16, 17) zur Erzeugung und Umwälzung eines Gemisches aus Gas und dem Pulver verbunden ist, und mit Mitteln (22, 29), die den Abschnitt in Schwingungen versetzen, dadurch gekennzeichnet, daß der Abschnitt der biegsamen Leitung aus dem Endstück einer Leitung besteht, die das Gehäuse (12) durchquert und in die Ausstoßdüse mündet, und daß das Gehäuse außerdem die Mittel umfaßt, die den Abschnitt in Schwingungen versetzen.
2. Spritzgerät nach Anspruch 1, dadurch gekennzeichnet, daß die Mittel, die den Abschnitt in Schwingungen versetzen, einen Vibrator (22) umfassen, der schwimmend in dem Gehäuse angeordnet und fest mit dem Abschnitt (20) verbunden ist.
3. Spritzgerät nach Anspruch 2, dadurch gekennzeichnet, daß der Vibrator einen ringförmigen Käfig (24) umfaßt, der den Abschnitt umgibt und mit diesem verbunden ist, außerdem eine im Inneren dieses Käfigs bewegliche Kugel (23), sowie Mittel zum Einblasen von Luft in den Käfig in einer solchen Richtung, daß die Kugel in dem Käfig in Bewegung versetzt wird.
4. Spritzgerät nach Anspruch 1, dadurch gekennzeichnet, daß die Mittel, die den Abschnitt in Schwingungen versetzen, einen ringförmigen Hohlraum (28) in einem Ringkörper (29), der an der Innenwand des Gehäuses befestigt ist, sowie Mittel zum Einblasen von Luft in diesen Hohlraum umfassen, daß der Abschnitt (20) den Ringkörper axial durchquert, dessen Innendurchmesser größer als derjenige des Abschnitts (20) ist, und daß die innere Seitenwand (31) des Ringkörpers mit Löchern (32) durchbrochen ist, die in Richtung des Abschnitts geneigt münden.
5. Spritzgerät nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Abschnitt (20) an zwei Punkten im Inneren des Gehäuses fixiert ist, wobei sich einer dieser Punkte in der Nähe der Ausstoßöffnung (14) befindet.
6. Spritzgerät nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Ausstoßöffnung (14) in zumindest einer Richtung größer als der Durchmesser des Abschnitts ist, und daß ein Ende (20a) des letzteren frei schwingfähig in der Nähe der Ausstoßöffnung ist (Fig. 3).
7. Spritzgerät nach einem der Ansprüche 3 oder 4, dadurch gekennzeichnet, daß das Gehäuse Löcher (35) aufweist, die umfangsmäßig und schraubenförmig in der Nähe der Ausstoßöffnung (14) angeordnet sind, um in den Käfig oder Hohlraum eingeleitete Druckluft unter Erzeugung eines an sich bekannten Dralluftstroms hinter der Ausstoßöffnung entweichen zu lassen.
8. Spritzgerät nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Ausstoßöffnung (14) mit einer abnehmbaren Düse (41) versehen ist, die einen zur Aufnahme eines Endes des Abschnittes (20) der biegsamen Leitung geeigneten Durchlaß aufweist.
9. Spritzgerät nach Anspruch 8, dadurch gekennzeichnet, daß die Düse (41) sich an einer Innenquerwand (44) des Gehäuses über eine Ringdichtung (45) aus weichem und verformbarem Werkstoff abstützt, der die Abdichtung, die Halterung und die Dämpfung der Schwingungen des Abschnitts gewährleistet.
10. Spritzgerät nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß es einen demontierbaren Anschlußstutzen (36) umfaßt, der an der Gerätehinterwand befestigt ist, und daß das entsprechende Ende des Abschnitts (20) der biegsamen Leitung mit einem Kanal (41) in diesem Anschlußstutzen verbunden ist.
11. Spritzgerät nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß es einen Griff (15) umfaßt, der zumindest zu einem Teil (46) aus einem weichen Werkstoff ist, um die durch das Bewegen des Abschnittes (20) der biegsamen Leitung erzeugten Vibrationen zu dämpfen.
EP86401867A 1985-09-04 1986-08-25 Spritzgerät zum Spritzen eines pulverförmigen Stoffes Expired - Lifetime EP0216674B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8513123 1985-09-04
FR8513123A FR2586592B1 (fr) 1985-09-04 1985-09-04 Procede de projection d'un produit pulverulent et projecteur de produit pulverulent mettant en oeuvre un tel procede.

Publications (2)

Publication Number Publication Date
EP0216674A1 EP0216674A1 (de) 1987-04-01
EP0216674B1 true EP0216674B1 (de) 1990-03-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP86401867A Expired - Lifetime EP0216674B1 (de) 1985-09-04 1986-08-25 Spritzgerät zum Spritzen eines pulverförmigen Stoffes

Country Status (6)

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US (1) US4795094A (de)
EP (1) EP0216674B1 (de)
JP (1) JPS6257666A (de)
DE (1) DE3669269D1 (de)
ES (1) ES2002280A6 (de)
FR (1) FR2586592B1 (de)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4894075A (en) * 1989-03-09 1990-01-16 Richard A. Gerrard Filter for a fluidized bed powder coating apparatus
NZ229355A (en) * 1989-05-31 1991-12-23 Nz Ministry Forestry Spray nozzle assembly; flexible fluid outlet within nozzle to atomise fluid
JPH0745993Y2 (ja) * 1990-12-27 1995-10-18 株式会社ピーエフユー プリント板ユニットにおける前面シールド板の構造
US5469993A (en) * 1993-12-02 1995-11-28 Monsanto Company Dispensing system
US5533673A (en) * 1994-10-31 1996-07-09 Jet Blast Products Corp. Nozzle system imparting compound motion
US5520736A (en) * 1995-01-18 1996-05-28 Plastic Flamecoat Systems, Inc. Vent block for flame spray coating system
USD380148S (en) * 1995-07-19 1997-06-24 Monsanto Company Of St. Louis Dispensing system
US6758418B2 (en) * 2001-08-07 2004-07-06 Nordson Corporation Swirl gun
US8056830B1 (en) * 2009-01-02 2011-11-15 Jeff M Pedersen Spinner tip shower head
DE102018110207B4 (de) * 2018-04-27 2020-06-10 Baumer Hhs Gmbh Saugförderdüse zum pneumatischen Fördern von Granulat

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Publication number Priority date Publication date Assignee Title
US2675777A (en) * 1954-04-20 Pneumatic vibrating device
US3123302A (en) * 1964-03-03 Pressurized
US699838A (en) * 1899-09-05 1902-05-13 Myron E Evans Sand-blasting apparatus.
US3108749A (en) * 1962-03-28 1963-10-29 Gen Motors Corp Vibratory apparatus for atomizing liquids
US3374953A (en) * 1965-08-25 1968-03-26 Albert G. Bodine Sonically vibratory liquid sprayer
US3474967A (en) * 1967-11-30 1969-10-28 Albert G Bodine Sprayer
US3563421A (en) * 1968-08-09 1971-02-16 Standard Pressed Steel Co Vibrating mechanism
US3740260A (en) * 1971-04-01 1973-06-19 Archilithic Co Dispensing gun for fiber rovings and cementitious materials
US3925580A (en) * 1973-04-25 1975-12-09 Grow Chemical Corp Method of spraying a powder paint slurry
US4067150A (en) * 1975-11-03 1978-01-10 Argonite, Inc. Sandblast abrading apparatus
US4438884A (en) * 1981-11-02 1984-03-27 Spraying Systems Company Quick disconnect nozzle
FR2541911B1 (fr) * 1983-03-02 1986-10-03 Kurosaki Refractories Co Tuyere de pulverisation
US4540120A (en) * 1983-07-14 1985-09-10 Metco, Inc. Powder feed system for flame spray guns

Also Published As

Publication number Publication date
FR2586592B1 (fr) 1988-07-15
ES2002280A6 (es) 1988-08-01
DE3669269D1 (de) 1990-04-12
EP0216674A1 (de) 1987-04-01
FR2586592A1 (fr) 1987-03-06
JPS6257666A (ja) 1987-03-13
US4795094A (en) 1989-01-03

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