EP0801991A2 - Appareil rotatif de pulvérisation électrostatique - Google Patents

Appareil rotatif de pulvérisation électrostatique Download PDF

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Publication number
EP0801991A2
EP0801991A2 EP97106001A EP97106001A EP0801991A2 EP 0801991 A2 EP0801991 A2 EP 0801991A2 EP 97106001 A EP97106001 A EP 97106001A EP 97106001 A EP97106001 A EP 97106001A EP 0801991 A2 EP0801991 A2 EP 0801991A2
Authority
EP
European Patent Office
Prior art keywords
drive shaft
atomizing head
bearing
conductive material
coating apparatus
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Withdrawn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
EP97106001A
Other languages
German (de)
English (en)
Other versions
EP0801991A3 (fr
Inventor
Ichio Tomita
Isamu Yamasaki
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.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
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 Toyota Motor Corp filed Critical Toyota Motor Corp
Publication of EP0801991A2 publication Critical patent/EP0801991A2/fr
Publication of EP0801991A3 publication Critical patent/EP0801991A3/fr
Withdrawn legal-status Critical Current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
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
    • B05B3/1064—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces the liquid or other fluent material to be sprayed being axially supplied to the rotating member through a hollow rotating shaft
    • 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
    • B05B5/0415—Driving means; Parts thereof, e.g. turbine, shaft, bearings
    • 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
    • B05B5/053—Arrangements for supplying power, e.g. charging power
    • B05B5/0533—Electrodes specially adapted therefor; Arrangements of electrodes

Definitions

  • the present invention relates to a rotary atomizing electrostatic coating apparatus, and more particularly to a rotary atomizing electrostatic coating apparatus capable of lightening an air motor.
  • the rotary atomizing electrostatic coating apparatus generally includes an atomizing head (bell head) 1, a drive shaft 2, an air motor 3', a main housing 4', a shaping air cap 5, at least one paint feed tube 6, and a high voltage generator 7.
  • the air motor 3' includes a radial bearing 8', a thrust bearing 9', bearing housings 10' and 11' for supporting the radial bearing 8' and the thrust bearing 9', respectively, and an air supply nozzle 13' for driving a turbine.
  • a static-pressure air bearing is currently used for the bearing of the air motor 3'.
  • compressed air from an external air source is supplied to a radial gap between the air bearing 8' and the drive shaft 2, so that the drive shaft 2 floats from the air bearing 8' to produce a non-contact and completely oil less condition.
  • the atomizing head 1 coupled to the drive shaft 2 is driven by supplying compressed air to turbine blades 12 fixed to the drive shaft.
  • all elements of the air motor except the bearing metal are made from electrically conductive material (usually metal, and more particularly the housings 10' and 11' are made from aluminum and the bearings 8' and 9' are made from zinc bronze), and electrical charge is generated by contacting an electrode pin 14 to an outside surface of the air motor 1.
  • electrically conductive material usually metal, and more particularly the housings 10' and 11' are made from aluminum and the bearings 8' and 9' are made from zinc bronze
  • the electrode pin 14 (which may be replaced by a coil spring or a plate spring) is not permitted to contact the drive shaft 2. This is because if the electrode pin 14 contacts the drive shaft 2, a load will act on the drive shaft 2 to deteriorate the floating support of the drive shaft 2.
  • the conventional apparatus has the following problems because the elements of the air motor are made from the electrically conductive material (usually, metal):
  • An object of the present invention is to provide a rotary atomizing electrostatic coating apparatus capable of lightening an air motor, thus the apparatus itself.
  • a rotary atomizing electrostatic coating apparatus includes a drive shaft to which an atomizing head is coupled and an air motor for supporting and driving the drive shaft.
  • a pin electrode needle electrode
  • a corona charge is generated between the electrode and the drive shaft or the atomizing head to electrically charge the atomizing head directly or via the drive shaft.
  • the bearing and the bearing housing of the air motor are permitted to be made from electrically non-conductive material, for example, ceramics and synthetic resin, so that the air motor and the apparatus are lightened as compared with the conventional air motor made from metal and the conventional apparatus.
  • FIG. 1 illustrates a rotary atomizing electrostatic coating apparatus according to a first embodiment of the present invention
  • FIG. 2 illustrates a rotary atomizing electrostatic coating apparatus according to a second embodiment of the present invention. Portions common or similar to the first and second embodiments of the present invention are denoted with the same reference numerals throughout the first and second embodiments of the present invention.
  • a rotary atomizing electrostatic coating apparatus generally includes a rotatable atomizing head (bell head) 1 for atomizing and scattering paint, a rotatable hollow drive shaft having a front end to which the atomizing head 1 is coupled, an air motor 3 for rotatably and floatingly supporting and rotating the drive shaft 2, a main housing 4 housing the air motor 3 therein, a shaping air cap 5 coupled to a front end of the main housing 4 (similar to the structure of FIG. 3), at least one paint feed tube 6 (similar to the structure of FIG. 3), and a high voltage generator 7 for charging electricity finally to the atomizing head 1 to a high voltage.
  • the high voltage generator 7 contacts neither the atomizing head 1 nor members electrically connected to the atomizing head.
  • the air motor 3 includes a radial bearing 8 rotatably supporting the drive shaft 2, a thrust bearing 9, housings 10 and 11 for supporting the bearings 8 and 9, respectively, an air supply nozzle 13 for supplying air to turbine blades 12 integrally coupled to the drive shaft 2.
  • a static-pressure air bearing is used for the bearings 8 and 9 of the air motor 3.
  • the static-pressure air bearing causes the drive shaft 2 to float from the bearings 8 and 9 by supplying air from an external air source to a clearance (several to one hundred microns in thickness) between the drive shaft 2 and the bearings 8 and 9, whereby non-contact and completely oil-less rotation of the drive shaft is conducted.
  • the atomizing head 1 coupled to the drive shaft 2 is rotated by supplying compressed air to the turbine blades 12 of the drive shaft 2.
  • an electrode 15 having a configuration of a pin or needle (hereinafter, a pin type electrode or a needle type electrode) is provided so as to oppose the drive shaft 2 or the atomizing head 1 with a gap remaining therebetween. Electricity is charged to the drive shaft 2 or the atomizing head 1 utilizing a corona discharge (a discharge emitting a weak light from a tip of the electrode, which is generated before spark discharge occurs) generated between the pin type electrode 15 and the drive shaft 2 or the atomizing head 1 when the electrode 15 is charged at a high voltage (for example, several thousand volts). By this corona discharge, the atomizing head 1 is charged directly or via the drive shaft 2.
  • the atomizing head 1 and the drive shaft 2 are made from electrically conductive material (for example, stainless steel).
  • the pin type electrode 15 is electrically connected to the high voltage generator 7.
  • the bearings 8 and 9 and the bearing housings 10 and 11 do not need to be made from electrically conductive material, and can be made from electrically non-conductive material such as synthetic resin and ceramics.
  • the radial bearing 8 and the thrust bearing 9 are made from ceramics
  • the bearing housings 10 and 11 are made from synthetic resin (more particularly, polyethylene terephthalate).
  • the air motor 3 and the coating apparatus including the air motor are lightened compared with the conventional air motor made from metal materials and the apparatus including the conventional air motor.
  • synthetic resin for example, polyethylene terephthalate
  • synthetic resin is a hardness lower than that of metal material
  • a time period needed for machining the synthetic resin parts is decreased, whereby the manufacturing cost is also decreased.
  • an electrostatic capacity of the apparatus is also small so that handling the apparatus is easy.
  • the air motor 3 and the main housing 4 are separate members to each other.
  • the main housing 4 is made from synthetic resin (more particularly, polyethylene terephthalate).
  • the high voltage generator 7 and an shaping air passage 16 are disposed or formed in the housing 4.
  • the bearing housings 10 and 11 which constitute an outer portion of the air motor 3 are made from electrically non-conductive synthetic resin, the main housing 4 does not need to be thick from the viewpoint of electric insulation. As a result, the apparatus can be compact in size and can be lightened.
  • the outer synthetic resin housings 10 and 11 of the air motor 3 function also as a main housing so that a particular main housing 4 does not need to be provided.
  • the high voltage generator 7 and the shaping air passage 16 are disposed or formed.
  • the apparatus can be down-sized and lightened to a great extent.
  • the atomizing head is electrically charged using corona discharge by providing a pin type or needle type electrode opposing the atomizing head or the drive shaft, the bearings and bearing housings of the air motor do not need to be made from metal, so that the air motor and the coating apparatus can be lightened and be compact in size.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
EP97106001A 1996-04-16 1997-04-11 Appareil rotatif de pulvérisation électrostatique Withdrawn EP0801991A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP93792/96 1996-04-16
JP9379296A JPH09276750A (ja) 1996-04-16 1996-04-16 回転霧化静電塗装装置

Publications (2)

Publication Number Publication Date
EP0801991A2 true EP0801991A2 (fr) 1997-10-22
EP0801991A3 EP0801991A3 (fr) 1998-08-19

Family

ID=14092276

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97106001A Withdrawn EP0801991A3 (fr) 1996-04-16 1997-04-11 Appareil rotatif de pulvérisation électrostatique

Country Status (2)

Country Link
EP (1) EP0801991A3 (fr)
JP (1) JPH09276750A (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1118388A1 (fr) * 2000-01-15 2001-07-25 Lac Tec GmbH Gesellschaft für moderne Lackiertechnik Appareil rotatif de pulvérisation électrostatique
EP1384515A1 (fr) * 2002-07-22 2004-01-28 Dürr Systems GmbH Compensateur de charge pour un atomiseur rotatif
EP1393816A1 (fr) 2002-08-28 2004-03-03 Dürr Systems GmbH Dispositif de revêtement comprenant un pulvérisateur rotatif et son procédé de commande
US6896735B2 (en) 2002-01-24 2005-05-24 Behr Systems, Inc. Integrated charge ring
US6991178B2 (en) 2003-01-24 2006-01-31 Dürr Systems, Inc. Concentric paint atomizer shaping air rings
US7051950B2 (en) 2001-03-29 2006-05-30 Dürr Systems, Inc. Atomizer for coating unit and method for its material supply
US7328123B2 (en) 2002-09-30 2008-02-05 Durr Systems, Inc. System for collision avoidance of rotary atomizer
US7347649B2 (en) 2002-07-11 2008-03-25 Durr Systems, Inc. Powder purge tube
CN104619107A (zh) * 2015-01-12 2015-05-13 广东韦达尔科技有限公司 一种等离子电磁式旋转处理装置
CN104640339A (zh) * 2015-01-12 2015-05-20 广东韦达尔科技有限公司 一种等离子表面处理装置
DE102015004066A1 (de) * 2015-03-28 2016-09-29 Eisenmann Se Wellenelement eines Luftlagers, Luftlager und Rotationszerstäuber

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101027186B1 (ko) * 2003-01-10 2011-04-05 소니 주식회사 베어링 유닛 및 이 베어링 유닛을 이용한 회전 구동장치
KR101027671B1 (ko) * 2008-10-13 2011-04-12 한국타이어 주식회사 타이어의 ｔｗｉ 표면에 발광 조성물을 코팅하기 위한 장치

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3536514A (en) * 1963-06-13 1970-10-27 Ransburg Electro Coating Corp Electrostatic coating method
US4398672A (en) * 1980-03-20 1983-08-16 National Research Development Corporation Electrostatic spraying
US4589597A (en) * 1983-10-03 1986-05-20 Graco Inc. Rotary atomizer spray painting device
US4887770A (en) * 1986-04-18 1989-12-19 Nordson Corporation Electrostatic rotary atomizing liquid spray coating apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3536514A (en) * 1963-06-13 1970-10-27 Ransburg Electro Coating Corp Electrostatic coating method
US4398672A (en) * 1980-03-20 1983-08-16 National Research Development Corporation Electrostatic spraying
US4589597A (en) * 1983-10-03 1986-05-20 Graco Inc. Rotary atomizer spray painting device
US4887770A (en) * 1986-04-18 1989-12-19 Nordson Corporation Electrostatic rotary atomizing liquid spray coating apparatus
US4887770B1 (fr) * 1986-04-18 1993-05-25 Nordson Corp

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1118388A1 (fr) * 2000-01-15 2001-07-25 Lac Tec GmbH Gesellschaft für moderne Lackiertechnik Appareil rotatif de pulvérisation électrostatique
US7051950B2 (en) 2001-03-29 2006-05-30 Dürr Systems, Inc. Atomizer for coating unit and method for its material supply
US6896735B2 (en) 2002-01-24 2005-05-24 Behr Systems, Inc. Integrated charge ring
US7347649B2 (en) 2002-07-11 2008-03-25 Durr Systems, Inc. Powder purge tube
EP1384515A1 (fr) * 2002-07-22 2004-01-28 Dürr Systems GmbH Compensateur de charge pour un atomiseur rotatif
US8840050B2 (en) 2002-07-22 2014-09-23 Durr Systems, Inc. Potential neutralization arrangement for an electrostatic rotary atomizer
EP1393816A1 (fr) 2002-08-28 2004-03-03 Dürr Systems GmbH Dispositif de revêtement comprenant un pulvérisateur rotatif et son procédé de commande
US6972052B2 (en) 2002-08-28 2005-12-06 Behr Systems, Inc. Rotational atomizer with external heating system
US7328123B2 (en) 2002-09-30 2008-02-05 Durr Systems, Inc. System for collision avoidance of rotary atomizer
US6991178B2 (en) 2003-01-24 2006-01-31 Dürr Systems, Inc. Concentric paint atomizer shaping air rings
CN104619107A (zh) * 2015-01-12 2015-05-13 广东韦达尔科技有限公司 一种等离子电磁式旋转处理装置
CN104640339A (zh) * 2015-01-12 2015-05-20 广东韦达尔科技有限公司 一种等离子表面处理装置
DE102015004066A1 (de) * 2015-03-28 2016-09-29 Eisenmann Se Wellenelement eines Luftlagers, Luftlager und Rotationszerstäuber

Also Published As

Publication number Publication date
JPH09276750A (ja) 1997-10-28
EP0801991A3 (fr) 1998-08-19

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