EP0199054B1 - Dispositif pour le revêtement électrostatique d'objets avec un matériau de revêtement en poudre - Google Patents

Dispositif pour le revêtement électrostatique d'objets avec un matériau de revêtement en poudre Download PDF

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Publication number
EP0199054B1
EP0199054B1 EP86103297A EP86103297A EP0199054B1 EP 0199054 B1 EP0199054 B1 EP 0199054B1 EP 86103297 A EP86103297 A EP 86103297A EP 86103297 A EP86103297 A EP 86103297A EP 0199054 B1 EP0199054 B1 EP 0199054B1
Authority
EP
European Patent Office
Prior art keywords
coating material
gas
conduit
section
conductor electrode
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
EP86103297A
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German (de)
English (en)
Other versions
EP0199054A1 (fr
Inventor
Radovan Talacko
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.)
Gema Switzerland GmbH
Original Assignee
Gema Switzerland 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 Gema Switzerland GmbH filed Critical Gema Switzerland GmbH
Publication of EP0199054A1 publication Critical patent/EP0199054A1/fr
Application granted granted Critical
Publication of EP0199054B1 publication Critical patent/EP0199054B1/fr
Expired 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
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/06—Applying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying
    • B05B5/032—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying for spraying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/047—Discharge apparatus, e.g. electrostatic spray guns using tribo-charging

Definitions

  • Such a device is known for example from DE-PS-2 347 491.
  • the drain electrode is located in the flow area of the powder coating material. This requires a strong gas flow which is blown over the arrester electrode and is intended to prevent coating material from being able to accumulate on this arrester electrode. This large amount of gas accelerates the flow rate and also dilutes the coating material.
  • the high proportion of gas in the coating material stream has the disadvantage that many material particles are sprayed without reaching the object to be coated.
  • the high speed of the jet of coating material has the disadvantage that many material particles of the coating material bounce off the object to be coated instead of adhering to it.
  • DE-PS-2 203 351 shows a coating device in which the charging surface is formed by the channel wall of the supply channel and a grounded metal sleeve surrounding the channel wall is used as the discharge electrode.
  • this type of derivation of undesired charging of the charging surface is not as effective as an electrode arranged in the flow area of the coating material according to the aforementioned DE-PS-2 347 491.
  • US Pat. No. 4,090,666 proposes to accelerate the flow of the coating material through a gas flow surrounding it axially and to drive it radially outward against the wall of the feed channel.
  • this has the disadvantages already mentioned above that a large proportion of gas is added to the flow of the coating material and the coating material is sprayed at a disadvantageously high speed at the end of the feed channel.
  • the charging area can be increased in that, according to DD-PS-134 841, an inner body made of electrically insulating material is inserted into an outer body made of electrically insulating material, so that the feed channel formed between these two bodies is annular when viewed in the direction of flow.
  • an arrester electrode is arranged in the flow region of the coating material. There is a risk that coating material will deposit on the conductor electrode.
  • the device very often takes the form of a spray gun to be held by hand and should therefore be as light and small as possible not only for reasons of cost but also for convenient handling.
  • the object of the invention is to design the device in such a way that the coating material is electrically charged with high efficiency by friction, without the charging surfaces and the discharge electrode dropping to a poorer efficiency after a short period of operation due to antielectric charging or by deposition of coating material , and without having to put up with flow velocities and amounts of gas which impair the coating efficiency, the coating quality or parts of the device.
  • the arrester electrode or arrester electrodes are therefore absolutely separate from the current of the coating material.
  • gas is used for the first time as an electrical conductor for discharging the cations or anions from the surface of the charging surface or charging surfaces serving for friction charging to a conductor electrode lying outside the flow area of the coating material.
  • a small amount of gas and a low gas pressure are sufficient for this type of keeping the drain electrode clean and for removing the anions or cations from the charging surface.
  • the device according to the invention shown in Fig. 1 consists essentially of a base body 2, a conductor electrode 4 made of electrically conductive material extending through it, an inner body 8 made of electrically insulating material screwed onto an end 6 of the conductor electrode 4, the latter with radial distance coaxially surrounding outer body 10 made of electrically insulating material, and a protective sheath 12 which surrounds the outer body 10 and is screwed into the base body 2 such that it clamps the upstream end 14 of the outer body 10 between itself and the base body.
  • the materials of the inner body 8 and the outer body 10 can be the same or different. They form between them an annular feed channel 16, seen in the flow direction, the downstream end 18 of which forms a spray opening.
  • the coating material Upon exiting this spray opening 18, the coating material is deflected either by a pneumatic impact body 20 according to FIG. 1 or by a mechanical impact body 22 according to FIG. 2 in such a way that a spray cloud forms.
  • the pneumatic impact body 20 consists of a gas curtain that essentially radially emerges from the front end 24 of the inner body 8.
  • the mechanical impact body 22 is also located at the downstream end 24 of the inner body 8, and gas in the form of a gas curtain 26 also emerges approximately radially from the center of the mechanical impact body 22.
  • This gas curtain 26 serves primarily to keep the downstream end face 28 of the mechanical impact body 22 clean, but can also be designed so that it extends radially beyond the mechanical impact body 22 and acts as a pneumatic impact body in this area.
  • the gas 30 for the gas curtains 20 or 26 passes through a gas channel section 32 formed in the base body 2, a gas channel section 34 formed in the arrester electrode 4 and a cavity 36 in the inner body 8 to the impact body 20 from FIG. 1 or to the impact body 22 from FIG. 2.
  • the cavity 36 has the shape of a bore extending axially completely through the inner body 8.
  • Powdery coating material 40 passes through a channel 42 formed in the base body 2 between the upstream end 14 of the outer body 10 and the axially projecting end 44 of the inner body 8 in the feed channel 16 formed between these two bodies, and from this to the spray opening 18.
  • the clear flow passage cross section of the feed channel 16 is smaller than that of the channel 42, so that the coating material in Feed channel 16 is accelerated, and so that all particles of this coating material come into contact at least once with one of the charging surfaces 46 and / or 48 of the inner body 8 and the outer body 10 and are electrically charged by friction thereon.
  • the two bodies 8 and 10 could also consist of electrically conductive material, in which case it would then be necessary for their opposing charging surfaces 46 and 48 to be formed from electrically insulating material.
  • the inner body 8 is conically tapered towards its downstream end 24, while the charging surface 48 of the outer body 10 remains cylindrical over the entire distance. This results in a feed channel section 50 with an increasing flow passage cross section in front of the spray opening 18, in which the flow rate of the coating material is reduced.
  • the upstream section 44 of the inner body 8 separates the discharge electrode 4 from the supply channel 16 and the channel 42 of the main body 2.
  • the channel 42 of the main body 2 opens into an upstream starting section 52 of the supply channel 16, which is on the inside from the upstream end section 44 and is limited on the outside by the base body 2.
  • the beginning 14 of the outer body 10 lies axially offset downstream of the starting section 44. This results in a simple possibility of allowing the channel 42 to open into the supply channel 16.
  • the junction 58 is approximately where the upstream portion 44 of the inner body 8 ends.
  • the initial portion 44 of the inner body 8 which is made of electrically insulating material, extends beyond this mouth 58 upstream of the gas channel 60, in order to ensure that no coating material, which is located in the feed channel portion 52, comes into contact with the discharge electrode 4 can come.
  • Gas 62 passes through a bore 64 of the base body 2 into an annular space 66, in which it flows around a section 68 of the discharge electrode 4, from there enters the gas channel 60, in which it is strongly accelerated, and then occurs in the form of a flow direction seen in the form of an annular gas flow into the upstream initial section 52. Due to the high speed in the narrow gas channel 60, a small amount of gas is completely sufficient to prevent coating material from migrating back from the supply channel initial section 52 into the gas channel 60. The pressure of the gas of the gas channel 60 must be slightly higher than the pressure of the coating material prevailing at the exit point 58.
  • the gas not only keeps the conductor electrode 4 free of coating material in the gas channel 60, it also forms a gas cushion at the mouth 58, which prevents coating material from flowing to this mouth 58.
  • the further important purpose of this gas of the gas channel 60 is to flow completely through the feed channel 16 and to discharge electrical charges from the charging surfaces 46 and 48 of the inner body 8 and outer body 10, depending on the type of material, cations or anions against the direction of flow to the drain electrode 4. From the arrester electrode 4, the electrical charge reaches ground potential 70 via a screwed-on nut 68. Instead of ground potential, another electrical potential could also be used, by means of which electrical charges are drawn off from the charging surface 46 and 48 via the gas of the gas channel 60 to the arrester electrode 4.

Claims (7)

1. Dispositif pour le revêtement électrostatique d'objets avec un produit de revêtement en poudre, comprenant:
a) un canal d'amenée (16) pour le produit de revêtement, dans lequel se trouve au moins une surface de charge (46,48) en une matière électriquement isolante pour charger électriquement, par frottement sur la surface de charge, le produit de revêtement qui s'écoule le long d'elle,
b) au moins une électrode de dérivation (4) pour dériver la charge électrique qui prend naissance de manière indésirable sur la surface de charge,
c) un canal de gaz (60, 66) débouchant dans le canal d'amenée (16) pour amener du gaz dans le canal d'amenée,
d) un orifice de pulvérisation (18) situé à l'extrémité du canal d'amenée (16) pour pulvériser le produit de revêtement,
caractérisé par le fait que
e) l'électrode de dérivation (4) est disposée dans le canal de gaz (60, 66) en étant entièrement à l'extérieur de la zone d'écoulement du produit de revêtement, et
f) le canal de gaz (60, 66) présente une portion de canal (60) qui conduit de l'électrode de dérivation (4) dans le canal d'amenée (16) et par laquelle l'électrode de dérivation (4) est sépare dans l'espace de la zone du produit de revêtement dans le canal d'amenée (16).
2. Dispositif selon la revendication 1, caractérisé par le fait que la portion de canal (60) du canal de gaz (60, 66) qui conduit de l'électrode de dérivation (4) dans le canal d'amenée (16) présente une section transversale de passage de gaz qui est réduite.
3. Dispositif selon la revendication 1 ou 2, caractérisé par le fait que le canal de gaz (60, 66) entoure l'électrode de dérivation (4) de manière annulaire.
4. Dispositif selon l'une des revendications 1 à 3, caractérisé par le fait que l'électrode de dérivation (4) est reliée à un corps intérieur (8) qui est entouré à une distance radiale par un corps extérieur (10), le canal d'amenée (16) étant formé entre ces deux corps, au moins sur une partie de sa longueur, et présentant une section transversale de passage de l'écoulement qui, vue dans la direction axiale, est pour l'essentiel annulaire, et par le fait que les surfaces (46, 48) qui constituent le canal d'amenée (16) des deux corps (8, 10) sont constituées en une matière électriquement isolante et forment les surfaces de charge.
5. Dispositif selon la revendication 4, caractérisé par le fait que l'électrode de dérivation (4) est munie d'au moins un canal de passage (34) relié a un espace creux (36) qui s'étend dans la direction longitudinale à travers le corps intérieur (8).
6. Dispositif selon la revendication 4 ou 5, caractérisé par le fait que le corps intérieur (8) est pose sur l'électrode de dérivation (4), par le fait que la portion (44) du corps intérieur (8) qui est posée sur l'électrode de dérivation fait saillie axialement au-delà de l'extrémité amont (14) du corps extérieur (10), et par le fait qu'une conduite d'amenée (42) pour le produit de revêtement débouche dans le canal d'amenée (16) entre les deux extrémités amont (44, 14) du corps intérieur (8) et du corps extérieur (10).
7. Dispositif selon l'une de revendications 4 à 6, caractérisé par le fait que la portion d'extrémité aval (50) du canal d'amenée (16) présence une section transversale de passage de l'écoulement élargie, du fait que, dans cette portion d'extrémité, le corps intérieur (8) se rétrécit en cône dans la direction de l'écoulement, cependant que le corps extérieur présente un diamètre intérieur qui reste, pour l'essentiel, constant dans cette portion d'extrémité.
EP86103297A 1985-04-22 1986-03-12 Dispositif pour le revêtement électrostatique d'objets avec un matériau de revêtement en poudre Expired EP0199054B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853514523 DE3514523A1 (de) 1985-04-22 1985-04-22 Verfahren und vorrichtung zum elektrostatischen beschichten von gegenstaenden mit pulverfoermigem beschichtungsmaterial
DE3514523 1985-04-22

Publications (2)

Publication Number Publication Date
EP0199054A1 EP0199054A1 (fr) 1986-10-29
EP0199054B1 true EP0199054B1 (fr) 1988-12-14

Family

ID=6268829

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86103297A Expired EP0199054B1 (fr) 1985-04-22 1986-03-12 Dispositif pour le revêtement électrostatique d'objets avec un matériau de revêtement en poudre

Country Status (5)

Country Link
US (1) US4706890A (fr)
EP (1) EP0199054B1 (fr)
JP (1) JPS61283369A (fr)
DE (2) DE3514523A1 (fr)
ES (1) ES8704358A1 (fr)

Families Citing this family (17)

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Publication number Priority date Publication date Assignee Title
SE461319B (sv) * 1987-04-28 1990-02-05 Ac Greiff Ytbehandling Ab Anordning vid pulverspruta innefattande en ringformig friktionsuppladdningskanal
SE460643B (sv) * 1987-04-28 1989-11-06 Ac Greiff Ytbehandling Ab Anordning vid pulverspruta med en laangstraeckt ringformig uppladdningskanal
US5093602A (en) * 1989-11-17 1992-03-03 Charged Injection Corporation Methods and apparatus for dispersing a fluent material utilizing an electron beam
DE4141663C2 (de) * 1991-12-17 1996-09-19 Wagner Int Elektrostatische Pulver-Beschichtungspistole
US5397605A (en) * 1992-05-29 1995-03-14 Barbieri; Girolamo Method and apparatus for electrostatically coating a workpiece with paint
US5344082A (en) 1992-10-05 1994-09-06 Nordson Corporation Tribo-electric powder spray gun
US5341989A (en) * 1993-02-16 1994-08-30 Nordson Corporation Electrostatic powder spray gun with hose purge adaptor
EP0627265B1 (fr) * 1993-06-02 1998-01-21 Matsuo Sangyo Co., Ltd. Pistolet à charge tribo-électrique
US5622313A (en) * 1995-03-03 1997-04-22 Nordson Corporation Triboelectric powder spray gun with internal discharge electrode and method of powder coating
US5850976A (en) * 1997-10-23 1998-12-22 The Eastwood Company Powder coating application gun and method for using the same
US6467705B2 (en) 2001-01-29 2002-10-22 The Easthill Group, Inc. Tribo-corona powder application gun
FR2820344B1 (fr) 2001-02-08 2003-03-14 Eisenmann France Sarl Pulverisateur triboelectrique
DE10217653A1 (de) * 2002-04-19 2003-12-11 Itw Gema Ag Sprühbeschichtungsvorrichtung
US8371517B2 (en) * 2007-06-29 2013-02-12 Illinois Tool Works Inc. Powder gun deflector
US9027506B2 (en) * 2011-05-02 2015-05-12 Nordson Corporation Dense phase powder coating system for containers
JP6112130B2 (ja) * 2015-03-25 2017-04-12 トヨタ自動車株式会社 静電ノズル、吐出装置及び半導体モジュールの製造方法
CN107262320B (zh) * 2017-06-26 2023-08-29 中信戴卡股份有限公司 一种混线式轮毂螺栓孔自动清粉系统及组合式清粉枪

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DE2203351B1 (de) * 1972-01-25 1973-08-23 Schaad Hans J Verfahren und Vorrichtung zur Beschichtung von Gegenstaenden mit Kunststoffpulver
DD106308A1 (fr) * 1972-10-13 1974-06-12
US3802625A (en) * 1973-01-08 1974-04-09 Us Army Device for electrostatic charging or discharging
US4004733A (en) * 1975-07-09 1977-01-25 Research Corporation Electrostatic spray nozzle system
US4090666A (en) * 1976-05-19 1978-05-23 Coors Container Company Gun for tribo charging powder
US4090660A (en) * 1976-12-16 1978-05-23 Schram Robert A Disposable drinking cup lid
DD134841B1 (de) * 1978-03-22 1981-05-27 Peter Dressler Vorrichtung zum elektrokinetischen Beschichten mit pulver- und faserförmigen Teilchen
JPS6113097Y2 (fr) * 1979-10-03 1986-04-23
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DE3420325A1 (de) * 1984-05-30 1985-12-05 Ransburg-Gema AG, St.Gallen Spruehvorrichtung zum beschichten von gegenstaenden mit pulver

Also Published As

Publication number Publication date
JPH0410384B2 (fr) 1992-02-25
DE3514523C2 (fr) 1988-03-10
ES554190A0 (es) 1987-04-01
US4706890A (en) 1987-11-17
ES8704358A1 (es) 1987-04-01
EP0199054A1 (fr) 1986-10-29
DE3661401D1 (en) 1989-01-19
JPS61283369A (ja) 1986-12-13
DE3514523A1 (de) 1986-10-23

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