EP1129784B1 - Dispositif de revêtement électrostatique utilisé de deux façons et procédé correspondant - Google Patents

Dispositif de revêtement électrostatique utilisé de deux façons et procédé correspondant Download PDF

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Publication number
EP1129784B1
EP1129784B1 EP01101203A EP01101203A EP1129784B1 EP 1129784 B1 EP1129784 B1 EP 1129784B1 EP 01101203 A EP01101203 A EP 01101203A EP 01101203 A EP01101203 A EP 01101203A EP 1129784 B1 EP1129784 B1 EP 1129784B1
Authority
EP
European Patent Office
Prior art keywords
painting machine
aero
atomizing
painting
air
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
EP01101203A
Other languages
German (de)
English (en)
Other versions
EP1129784A2 (fr
EP1129784A3 (fr
Inventor
Eiji Saito
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.)
Carlisle Fluid Technologies Ransburg Japan KK
Original Assignee
Ransburg Industrial Finishing KK
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 Ransburg Industrial Finishing KK filed Critical Ransburg Industrial Finishing KK
Publication of EP1129784A2 publication Critical patent/EP1129784A2/fr
Publication of EP1129784A3 publication Critical patent/EP1129784A3/fr
Application granted granted Critical
Publication of EP1129784B1 publication Critical patent/EP1129784B1/fr
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
    • 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
    • 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
    • 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
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • 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
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B05B5/0426—Means for supplying shaping gas

Definitions

  • the present invention relates to an electrostatic painting machine, and more particularly, it relates to a painting machine that can serve as either an aero-atomizing painting machine or a rotary atomizing painting machine as required.
  • An electrostatic painting machine of this type is known from EP 0 850 693 A1.
  • Electrostatic painting is a way of painting where paint is applied to a target object in an electrostatic condition, and a painting machine to carry out such electrostatic painting is classified into two types, i.e., rotary atomizing painting machines and aero-atomizing painting machines.
  • the rotary atomizing painting machines inject paint which is transformed into fine particles by using corona discharged from an edge of a rotator such as a bell while the aero-atomizing painting machines inject paint which is atomized by using air as in a spray.
  • the rotary atomizing and aero-atomizing machines have been used depending upon types of paints and objects to be painted, as desired. Manufacturers of such painting machines have developed and sold in the markets those two types of painting machines, rotary atomizing painting machines and aero-atomizing painting machines, as being independent and separate from one another.
  • an electrostatic painting machine includes the features of claim 1.
  • Fig. 1 is an exploded view showing electrostatic painting machine and a deployment of its parts
  • Fig. 2 is a diagram showing the entire painting machine with an atomizing head attached thereto;
  • Fig. 3 is a partial sectional view illustrating a fore part of the painting machine in Fig. 2;
  • Fig. 4 is a diagram showing the entire painting machine with a rotary atomizing head attached thereto;
  • Fig. 5 is a partial sectional view illustrating a fore part of the painting machine in Fig. 4.
  • FIG. 1 is an exploded view showing a deployment of primary components of a preferred embodiment of a painting machine to give a clear schematic depiction of the machine.
  • a reference numeral 1 denotes an electrostatic painting machine, and the electrostatic painting machine is comprised of a gun 3 that is a main body of the painting machine, and first and second replaceable head assemblies 5 and 7 that can be selectively attached to a tip of the gun 3.
  • the painting machine serves as an aero-atomizing painting machine with the first head assembly 5 being attached to the gun 3 while it serves as a rotary atomizing painting machine with the first head assembly 5 being replaced with the second head assembly 7.
  • the electrostatic painting machine 1 has the shared gun 3 to which the first or second replaceable head assembly 5 or 7 is selectively attached, so that the single machine can be selectively used so as to dedicate itself as both the aero-atomizing painting machine and the rotary atomizing painting machine.
  • Fig. 2 is a schematic diagram illustrating the entire painting machine 1 with the first head assembly 5 being attached thereto for a use of the aero-atomizing painting machine while Fig. 3 is a sectional view showing a fore part of the painting machine extracted from Fig. 2.
  • Fig. 4 is a schematic diagram illustrating the entire painting machine 1 with the second head assembly 7 being attached thereto for a use of the rotary atomizing painting machine while Fig. 5 is a sectional view showing a fore part of the painting machine extracted from Fig. 4.
  • the gun 3 or shared component will first be described below.
  • the gun 3 is substantially equivalent to those well-known in the art and used for the prior art aero-atomizing painting machines.
  • the gun 3 has an elongated center hole 9 axially extending therein, and the elongated center hole 9 consists of a segment 13 having a relatively large diameter sufficient to enclose high-voltage cable 11 therein, a front opening 15 conducting to a fore end face 3a of the gun 3, and an intermediate segment 17 having a relatively small diameter and positioned between the front opening 15 and the cable enclosing segment 13, and all the three parts, the cable enclosing segment 13, the intermediate segment 17, and the front opening 15, are coaxially aligned with one another.
  • the front opening 15 is conceptually divided into an elongated section 15a circular in cross section, a bell-shaped section 15b gradually spreading outward, and a cylindrical holder section 15c having its inner surface threaded, which are all contiguous in this order from the intermediate portion 17 toward the fore end face 3a of the gun 3.
  • the intermediate segment 17 of the elongated center hole 9 has its inner surface threaded so that a threaded socket 19 is screwed in it to connect with each other.
  • the socket 19 is comprised of a cup 21 centered in its fore end face and circular in cross section, and a electrically conducting pin 23 extending between the bottom of the cup 21 and the high-voltage cable 11.
  • the gun 3 has its front portion provided with a first air port 25 opening to the fore end face 3a and a second air port 27 opening to the front opening 15 of the elongated center hole 9. More specifically, the second air port 27 has an opening at the boundary between the bell-shaped section 15b and threaded holder section 15c of the front opening 15. Pressurized air is supplied to the first and second air ports 25 and 27 via tubes 29 and 31, respectively, which are positioned inside the gun 3.
  • the gun 3 also has a paint introducing port (not shown) which opens to the front opening 15 of the elongated center hole 9. More specifically, the paint introducing port opens to an axially middle portion of the elongated section 15a in front opening 15, and liquid paint is supplied to the paint introducing port via a tube 32 (see Figs. 2 and 4) which is positioned in the gun 3.
  • a paint introducing port (not shown) which opens to the front opening 15 of the elongated center hole 9. More specifically, the paint introducing port opens to an axially middle portion of the elongated section 15a in front opening 15, and liquid paint is supplied to the paint introducing port via a tube 32 (see Figs. 2 and 4) which is positioned in the gun 3.
  • the aero-atomizing head assembly 5 includes, similar to the prior art embodiments, components such as a retainer ring 33, an air nozzle 35, a paint nozzle 37, and a needle-shaped electrode 39.
  • the needle-shaped electrode 39 is first inserted into the elongated center hole 9 of the gun 3, and thereafter, the rear end of the needle-shaped electrode 39 is fitted in the cup 21 of the socket 19.
  • the needle-shaped electrode 39 has its rear end face axially formed with a dent 39a in which electrically conducting material such as a metal spring 41 rests. In this way, the rear end of the needle-shaped electrode 39 is fitted in the cup 21 of the socket 19, and thus, the needle-shaped electrode 39 is electrically connected to the high-voltage cable 11 via the electrically conductive spring 41 and the electrically conducting pin 23.
  • a thread 37a machined in the outer peripheral surface of the paint nozzle 37 is screwed into the cylindrical holder section 15c of the elongated center hole 9 in the gun 3 to connect the paint nozzle 37 thereto.
  • the needle-shaped electrode 39 may be introduced into the paint nozzle 37 so that the paint nozzle 37 along with the needle-shaped electrode 39 integrated therewith can be attached to the gun 3.
  • the air nozzle 35 is attached onto the paint nozzle 37, and an inner circumferential thread 33a of the retainer ring 33 is screwed on an outer circumferential thread 3b at the front end of the gun 3 to tightly couple the air nozzle 35 with the paint nozzle 37 by means of the retainer ring 33.
  • the aero-atomizing head assembly 5 attached to the gun 3 has its paint nozzle 37 defining an annular air passage 43 in the boundary between the bell-shaped section 15b and holder section 15c in the elongated center hole 9 of the gun 3 so as to be conductive to the second air port 27, and the annular air passage 4 is conductive through an atomizing air passage 45 in the paint nozzle 37 to an air chamber 47 which is defined by the fore end face of the paint nozzle 37 and the air nozzle 35, and the air chamber 47 leads to an annular gap defined by a small center aperture 35a in the air nozzle 35 and the needle-shaped electrode 39 extending through the aperture.
  • the aero-atomizing head assembly 5 has an annular air passage 49 defined by both the retainer ring 33 and the air nozzle 35 in a location leading to the first air port 25 in the gun 3, and the annular air passage 49 is conductive to a spray hole 35b in the air nozzle 35 via a pattern air passage 51 in the air nozzle 35.
  • the passages linked in series to each other from the first air port 25 to the spray hole 35b in the air nozzle 35 make up the pattern air passage.
  • the series of the passages extending from the second air port 27 to the small center aperture 35a (the annular gap around the needle-shaped electrode 39) together create the atomizing air passage, and the air nozzle 35 jets air out through its small center aperture 35a while atomizing paint that is being sprayed out of the paint introducing port through the paint nozzle 37, similar to the prior art embodiments.
  • Such a feature of the painting machine 1 with the aero-atomizing head assembly 5 attached thereto is the same as that of the prior art dedicated aero-atomizing painting machine.
  • the rotary atomizing head assembly 7 includes components such as an outer shaping ring 55, an inner shaping ring 57, a bell 59, an air motor 61, and a paint supply tube 63 of electrically conductive material such as metal.
  • the components other than the paint supply tube 63 have been assembled together in advance to provide a preliminary assembly 65, and the head assembly 7 is attached to the gun 3 by first inserting the paint supply tube 63 into the elongated center hope 9 in the gun 3 and then screwing down a thread 63a machined on the rear portion of the paint supply tube 63 to fix the paint supply tube 63 to the cup 15c in the elongated center hope 9 in the gun 3.
  • the paint supply tube 6 of the electrically conducting material has a fastener portion 63b of which outer surface is shaped corresponding to the intermediate section along its axial direction or the bell-shaped section 15b and cylindrical holder section 15c of the front opening 15 located in the gun 3, and the outer circumferential thread 63a machined on the fastener portion 63b is screwed down in the cylindrical holder 15c to be engaged with a thread 3a, so that the paint supply tube 63 is fixed to the gun 3.
  • the rear end of the paint supply tube 63 is fitted in the cup 31 of the socket 19, similar to the needle-shaped electrode 39 of the aero-atomizing head assembly 5.
  • the paint supply tube 63 has its rear end face formed with a dent 63c which is located along its axial extension to house an electrically conductive material, and the electrically conductive spring 41 rests in the dent 63c as in the first head assembly 5.
  • the preliminary assembly 65 has a thread 61a machined in a recessed section at its rear end face of the air motor 61, and the thread 61a is screwed down on an outer circumferential thread 3b at the tip of the gun 3 to fix the preliminary assembly 65 to the gun 3.
  • the air motor 61 mentioned herein is of a type that employs a bearing having a ball bearing 61b, and alternatively, this may be replaced with any form of bearings well-known in the art.
  • the air motor 61 includes a motor body 67 and a cowling 69 surrounding it and made of electrically insulating plastic, and the bell 59 is attached to the tip of an output shaft 71 of the motor body 67.
  • the output shaft 71 is comprised of metal hollow shaft, and the hollow output shaft 71 encloses the paint supply tube 63 coaxially and spaced apart from it.
  • the rear end of the output shaft 71 slightly protrudes backward from the motor body 67, and such a protruding portion 71a has its outer circumferential surface threaded and screwed in a spacer 73 which functions to retain the output shaft 71 in position relative to the paint supply tube 63.
  • the spacer 73 is made of conductive metal, and the paint supply tube 63 and the conductive output shaft 71 are electrically connected to each other via the metal component. By virtue of such connection, there is provided an electrical path leading from the high-voltage cable 11 through the conductive pin 23, the conductive spring 41, the paint supply tube 63, the spacer 73 and the output shaft 71 to the bell 59, creating electrostatic field between a front edge of the bell 59 and an object to be painted.
  • the plastic cowling 69 for the air motor 61 is provided with a first inner path 75 leading to the first air port 25 and a second inner path 77 leading to the motor body 67.
  • the first inner path 75 has an annular inlet 75a located at an interface with an outlet of the first air port 25 and an annular outlet 75b opening to a shaping path 79 defined by both the outer shaping ring 55 and the inner shaping ring 57.
  • the second inner path 77 has an annular inlet 77a located adjacent to the fastener portion 63b of the paint supply tube 63.
  • a plurality of through-holes 63d are formed, extending axially in the outer circumference of the fastener portion 63b of the paint supply tube 63, and the plurality of the through-holes 63d are spaced from one another.
  • the through-holes 63d in the fastener portion 63a and the annular inlet 77a are capable of ensuring a communication of the second air port 27 with the second inner path 77.
  • a continuous passage leading from the first air port 25 through the first inner path 75 to the shaping path 79 serves as a shaping path through which pressurized air flows till it is blown out thorough a gap defined at the front end between the outer shaping ring 55 and the inner shaping ring 57.
  • pressurized air introduced into the second inner path 77 from the second air port 27 actuates the air motor 61 to cause the bell 59 to rotate at high velocity.
  • the exemplary painting machine 1 has a shared gun 3 to which the first head assembly 5 or the second head assembly 7 is selectively attached, and thus, the painting machine 1 can be used in two ways of use as the aero-atomizing painting machine and the rotary atomizing painting machine. More specifically, the exemplary painting machine 1 incorporates full features and performances of the prior art aero-atomizing painting machines along with the second head assembly 7 so that it can function just as the rotary atomizing painting machine. Additionally, when used as the rotary atomizing painting machine, the exemplary painting machine 1 is energized to supply electric power to the bell 59 by means of the high-voltage cable 1 via the paint supply tube 63 and the spacer 73.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)

Claims (2)

  1. Machine à peindre électrostatique susceptible de fonctionner de façon sélective suivant deux modes de fonctionnement, comprenant :
    un corps en commun (3) de la machine à peindre (1),
    des têtes aéro-pulvérisatrices remplaçables et pulvérisatrices rotatives (5, 7) susceptibles d'être attachées au corps (3) et détachées de celui-ci, et
    la machine à peindre (1) étant dédiée à la peinture par aéro-pulvérisation lorsque la tête aéro-pulvérisatrice (5) est attachée au corps (3) de la machine à peindre (1),
    la machine à peindre (1) étant dédiée à la peinture par pulvérisation rotative lorsque la tête pulvérisatrice rotative (7) est attachée au corps (3) de la machine à peindre (1), et
    caractérisée en ce que
    le corps (3) de la machine à peindre (1) comprend une ouverture (15) dans une face d'extrémité avant du corps (3), un câble haute tension (11) et une douille (19) raccordée électriquement au câble haute tension (11) située dans l'ouverture (15),
    la douille (19) comprend une portion évidée dans laquelle vient se loger une extrémité arrière d'une électrode en forme d'aiguille (39) ou un composant de la tête aéro-pulvérisatrice (5) ou une extrémité arrière d'un tube (32) d'alimentation en peinture ou un composant de la tête pulvérisatrice rotative (7), et
    le tube (32) d'alimentation en peinture est constitué d'un matériau conducteur, et le tube (32) d'alimentation en peinture est utilisé pour alimenter en électricité un cône (59) ou un composant de la tête pulvérisatrice rotative (7).
  2. Machine à peindre électrostatique selon la revendication 1, dans laquelle lorsque la tête aéro-pulvérisatrice (5) est attachée au corps (3) de la machine à peindre, de l'air de motif et de l'air pulvérisateur pour la tête aéro-pulvérisatrice (5) sont délivrés par des premier et deuxième passages d'air (29, 31) situés à l'intérieur du corps (3) de la machine à peindre (1), et
    lorsque la tête pulvérisatrice rotative (7) est attachée au corps (3) de la machine à peindre (1), de l'air de mise en forme et de l'air d'entraínement de moteur pour la tête pulvérisatrice rotative (7) sont délivrés par les premier et deuxième passages d'air (29, 31) situés à l'intérieur du corps (3) de la machine à peindre (1).
EP01101203A 2000-01-26 2001-01-19 Dispositif de revêtement électrostatique utilisé de deux façons et procédé correspondant Expired - Lifetime EP1129784B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000017551 2000-01-26
JP2000017551A JP2001205143A (ja) 2000-01-26 2000-01-26 ２つのタイプに使い分けることのできる静電塗装機及びその方法

Publications (3)

Publication Number Publication Date
EP1129784A2 EP1129784A2 (fr) 2001-09-05
EP1129784A3 EP1129784A3 (fr) 2002-11-13
EP1129784B1 true EP1129784B1 (fr) 2003-12-17

Family

ID=18544539

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01101203A Expired - Lifetime EP1129784B1 (fr) 2000-01-26 2001-01-19 Dispositif de revêtement électrostatique utilisé de deux façons et procédé correspondant

Country Status (6)

Country Link
EP (1) EP1129784B1 (fr)
JP (1) JP2001205143A (fr)
KR (1) KR100738570B1 (fr)
CN (1) CN1171684C (fr)
DE (1) DE60101489T2 (fr)
TW (1) TW496779B (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10022854A1 (de) * 2000-05-10 2001-11-15 Duerr Systems Gmbh Verfahren und Beschichtungsmaschine zur Serienbeschichtung von Werkstücken
US20040195401A1 (en) * 2003-02-28 2004-10-07 Strong Christopher L. Repeatable mounting unit for automatic spray device
JP2004321844A (ja) * 2003-04-21 2004-11-18 Ransburg Ind Kk 回転霧化型塗装機
JP2004321845A (ja) * 2003-04-21 2004-11-18 Ransburg Ind Kk 回転霧化型塗装機
JP4428973B2 (ja) * 2003-09-10 2010-03-10 トヨタ自動車株式会社 回転霧化塗装装置および塗装方法
US7913938B2 (en) 2004-11-12 2011-03-29 Mystic Tan, Inc. Electrostatic spray nozzle with adjustable fluid tip and interchangeable components
CA2597250A1 (fr) * 2004-11-12 2006-05-18 Mystic Tan, Inc. Systeme de buse de pulverisation electrostatique
CN101184555B (zh) * 2005-05-25 2011-12-28 阿耐斯特岩田株式会社 粉体静电喷涂用的喷枪
DE102012022535A1 (de) * 2012-11-16 2014-05-22 Eisenmann Ag Applikator-Anschlusseinheit, Applikationsroboter und Anlage zum Beschichten von Gegenständen
US20190265127A1 (en) * 2016-07-28 2019-08-29 Abb K.K. Assembly suitability determination device, method, program, and recording medium
CN107638969A (zh) * 2017-11-07 2018-01-30 西安智水环境科技有限公司 一种消霾系统喷头专用静电加载装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998003268A1 (fr) * 1996-07-18 1998-01-29 Abb Industry K.K. Dispositif de pulverisation de peinture
JP3442971B2 (ja) * 1996-07-18 2003-09-02 Ａｂｂ株式会社 塗料噴霧装置

Also Published As

Publication number Publication date
TW496779B (en) 2002-08-01
CN1319457A (zh) 2001-10-31
DE60101489T2 (de) 2004-06-09
CN1171684C (zh) 2004-10-20
EP1129784A2 (fr) 2001-09-05
KR20010078023A (ko) 2001-08-20
EP1129784A3 (fr) 2002-11-13
DE60101489D1 (de) 2004-01-29
KR100738570B1 (ko) 2007-07-12
JP2001205143A (ja) 2001-07-31

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