EP0756899B1 - Elektrostatische Sprühvorrichtung für Beschichtungsmaterial - Google Patents

Elektrostatische Sprühvorrichtung für Beschichtungsmaterial Download PDF

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Publication number
EP0756899B1
EP0756899B1 EP96108654A EP96108654A EP0756899B1 EP 0756899 B1 EP0756899 B1 EP 0756899B1 EP 96108654 A EP96108654 A EP 96108654A EP 96108654 A EP96108654 A EP 96108654A EP 0756899 B1 EP0756899 B1 EP 0756899B1
Authority
EP
European Patent Office
Prior art keywords
conductor path
duct
sleeve
spray device
electrical
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
EP96108654A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0756899A3 (de
EP0756899A2 (de
Inventor
Karl Buschor
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 EP0756899A2 publication Critical patent/EP0756899A2/de
Publication of EP0756899A3 publication Critical patent/EP0756899A3/de
Application granted granted Critical
Publication of EP0756899B1 publication Critical patent/EP0756899B1/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
    • 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
    • B05B5/0535—Electrodes specially adapted therefor; Arrangements of electrodes at least two electrodes having different potentials being held on the discharge apparatus, one of them being a charging electrode of the corona type located in the spray or close to it, and another being of the non-corona type located outside of the path for the material
    • 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
    • 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

Definitions

  • the invention relates to an electrostatic Spraying device for coating material according to Claim 1.
  • An electrostatic spray device of this type is from the patent application publication DE 43 25 911.1 known.
  • the known spray device for Coating powder has a variety of Counter electrodes, which are coaxial in a ring to a powder channel upstream of a spray nozzle are arranged, which the coating material spraying onto an object to be coated.
  • a of electrical high voltage in the area between 4000 and 140,000 volts connected Charging electrode is near the Spray opening of the spray nozzle arranged for electrostatic charge of the Coating material.
  • the counter electrodes are on a counter potential, preferably earth potential, connected, through which from the of the Charging electrode generated electrical Space charge free charges (electrons, ions) for Pull the counter electrode and on the Counter potential can be derived.
  • the counter electrodes are connected to an electrical line electrical connector on the rear Device end electrically connected to which the counter potential can be connected.
  • the ring, which carries the counter electrodes is with a Sleeve inseparable and not relative to the sleeve movably connected, which the spray nozzle against a base body of the sprayer in position holds.
  • the sleeve is on the base body screwed. So that for this screwing process Sleeve and the ring rotated relative to the body is the electrical path to the Deriving the electrical charges from the Counter electrodes formed in two parts and the both parts of the route are through one Slip ring connection releasably connected.
  • the Counter electrode device consists of a the front end portion of the sprayer clip-on ring, which has several counter electrodes carries, and from one of the ring backwards path-breaking electrical conduction path in the form a plastic stick and one in it housed electrical conductor.
  • the whole Counter electrode device is thus on the outer circumference the sprayer attached and can easily attached or removed.
  • An advantage is, The spray devices with such a Counter electrode device also afterwards (retro-fit) can be provided.
  • the disadvantage is that the counter electrode device can easily get dirty and the pipeline as well the ring must be a stable construction.
  • the object of the invention is to be achieved an electrostatic spray device for Coating powder and for liquid Form coating material so that it on simple way with or without counter electrodes can be used, in the second case a Forget about counterelectrode line parts in the Spray device can be reliably prevented should, without this counter electrode lead parts be attached externally to the sprayer have to.
  • This object is achieved according to the invention solved by the features of claim 1.
  • the electrostatic spray device after the Invention can be used to spray coating powder or coating liquid.
  • the electrostatic shown in Fig. 1 Spray device is used for spray coating Coating powder, which after spraying on an object to be coated on this Item is melted and baked.
  • the Spray device 1 can, however, be modified Form for spraying liquid coating material be used.
  • the spray device 1 contains a body 4 electrically insulating material, an axially through the body 4 leading tube 8 from electrically insulating material, itself downstream to body 4 and tube 8 subsequent intermediate piece 12 or web part and a downstream nozzle 10 each made of electrically insulating material.
  • the pipe 8, the intermediate piece 12, a socket surrounding it 6 and the nozzle 10 form a material channel or Powder channel 14 with a channel axis 16, through which from an upstream rear Device part 15, which is carried by the body 4 becomes or is part of it, powder to the nozzle 10 and by one formed in the nozzle 10 Spray opening 18 is conveyed pneumatically.
  • the Nozzle 10 may include a metal insert in which the spray opening 18 is formed. The Powder is directed towards you through the spray opening 18 sprayed coating object.
  • the Intermediate piece 12 is a narrow plate which is the coating material axially can flow past.
  • the intermediate piece 12 carries a needle-shaped charging electrode 20 in one Air duct 24 in the duct axis 16, so that the Charging electrode 20 and its electrode tip 21 near the spray opening 18 of compressed air from the Air duct 24 are flowed around.
  • the Charging electrode 20 is electrical Head 26 in the intermediate piece 12, upstream of which connecting electrical contacts 28 and 29, an electrical resistance column 25 and one Compression spring 27 to a front High voltage output 30 one High voltage generator 32 connected.
  • the High voltage generator 32 is preferably one known cascade circuit from electrical Resistors, capacitors and rectifiers.
  • the high voltage generator 32, the compression spring 27 and the electrical resistance column 25 are located in a parallel to the material channel 14 extending through the body 4 Through opening 36.
  • the through opening 36 and also have the body 4 in the area of High voltage generator 32 opposite the front Section 38 of the body 4 an upward expanded volume.
  • the resistance column 25 is in the relatively lower front section 38 housed.
  • the high voltage generator 32 has one Low voltage input 34 at the rear Device part 15 for connection to an external electrical low voltage source.
  • the Low voltage is in the range, for example between 6 volts and 24 volts AC.
  • the High voltage of the charging electrode 20 is for example in the range between 4 kV and 140 kV.
  • the high voltage generator 32 can from the Body 4 can be removed to the rear. After axially pulling out the intermediate piece 12 after front, the electrical contacts 28 and 29 can be separated, the resistance column 25 after be pulled out of the front of the body 4.
  • the body 4 is on its cylindrical front End section 38 with an external thread 40 provided on which a sleeve 42 made of electrical insulating material with its internal thread 41 is screwed.
  • the sleeve 42 is over the nozzle 10 inserted and pushes backwards with one pointing radial end face 44 against one after radial end face 46 of the nozzle 10 pointing forward.
  • the sleeve 42 clamps the nozzle 10 and that Intermediate piece 12 against one pointing forward radial face 48 of the body 4.
  • Die axially parallel through opening 36 ends in this forward-facing radial face 48 of the Body 4.
  • the sleeve 42 is over it Internal thread 41 backwards through one rear sleeve section 50 extended.
  • the cylindrical front portion 38 of the body 4 has one behind its external thread 40 threadless section 53 with preferably slightly larger diameter than that Male thread 40, and then one behind Diameter larger rear end portion 55, the a diameter equal to the outside diameter of the Has sleeve 42 so that it with the outer Shell surface of the sleeve 42 is axially aligned.
  • a sleeve or pipe section or ring 51 electrically insulating material hereinafter Called ring, carries a variety of coaxial ring-shaped around the material channel 14 arranged needle-shaped counter electrodes 52. Die Counter electrodes 52 are in radial Bores 56 formed in the ring 51 and in its outer lateral surface 58 open.
  • the ring 51 extends axially to the channel axis 16 around the Material channel 14 around, one radial and one axial distance between the counter electrodes 52 and the charging electrode 20 is present.
  • a slit-like recess 57 formed from the rear end portion 55 of the front portion 38 of the body 4 to Male thread 40 extends and, with the exception of one small radial through opening 59, from the Sleeve 42 is covered.
  • the radial one Through opening 59 is between the rear End 61 of the sleeve 42 and her opposite rear end wall 63 of the Recess 57 formed.
  • the inner diameter of the ring 51 is only very little (less than 1 mm) larger than that Outer diameter of the sleeve 42.
  • the ring 51 was before the sleeve 42 is screwed onto the body 4 from the front over the front End portion 38 of the body 4 on the rear End part 55 of this front section 38 up to attached a stop 65 of the body 4.
  • the only after that sleeve 42 screwed onto the body 4 extends with its rear portion 50 between the body 4 and a front section 67 of the ring 51.
  • the front section 67 of the Ring 51 extends the length of the Recess 57 and is of the sleeve 42 radially and positioned in the forward direction.
  • the ring 51 will from the rear end portion 55 of the body 4 radially and from the stop 65 of the body 4 in the reverse direction positioned.
  • the ring 51 is in the forward direction, Reverse direction and circumferentially around the Material channel 14 also through an electrical Line route 70 positioned, which is different from the radially inner ends of the counter electrodes 52 up to an electrical counter potential connection element 72 at the rear end of the rear part of the device 55 essentially parallel to the material channel 14 extends so that the counter electrodes 52 over the Connection element 72 to an electrical Counter potential, preferably earth potential, can be connected.
  • This electrical Counter potential differs from electrical high voltage potential of the Charging electrode 20 that the counter electrodes 52nd free electrons and ions from the electrical Space charge cloud of the charging electrode 20 attract which derived on the counter potential become.
  • the counter electrodes 52 are located as close as possible to the spray opening 18 to the to have the best electrical efficiency.
  • the counter electrodes 52 have to go as far be removed from the charging electrode 20 that no electrical flashover can take place and that only free electrical charges (electrons, Ions) are sucked off from the counter electrode 52, however none to charge the Coating material required electrical Charges of the high voltage electrode 20.
  • the counter electrodes 52 a have another shape, for example by a Electrode ring be formed.
  • the electrical conduction path 70 for the Counter electrodes 52 consist of one piece front conduction path section 74 in the ring 51, a then essentially radially from the ring 51 through the radial through opening 59 between the sleeve 42 and the one pointing forward rear end face 63 of the recess 57 extending intermediate portion 76, and one rearward connecting rear Line path section 78 in a through hole 80, which is through the body 4 and the rear device part 15 parallel to Channel axis 16 of the material channel 14 extends.
  • This line path bore 80 is at its rear End with the counter potential connection element 72 provided and ends at its front end in the forward-facing rear face 63 of the Recess 57 radially within this recess 57.
  • the Route 70 is a Z-shape rectangular kinked shape. Because the pipeline through hole 80 of the body 4 is lower than the external thread 40 of the body 4, must at least the rear conduit path section 78 of the Route 70 be flexible so that it through the Recess 57 forward through the thread 40 from the line path through hole 80 can be pulled out or vice versa in the Line path through hole 80 inserted can be.
  • Intermediate route section 76 lies between the rear end 61 of the sleeve 42 and the front end facing forward 63 of the body 4 and is between these two Elements positioned axially, which also the Ring 51 is positioned axially.
  • Rear Conduit section 78 has in the conduit through hole 80 preferably only a little Clearance to the surrounding bore wall of the Body 4, so that the rear conduit section 78 in the conduit through hole 80 in the circumferential direction with the material channel 14 little leeway essentially stationary is positioned, with which the ring 51 in Circumferential direction around the material channel 14 stationary is positioned.
  • the conduction path 70 preferably consists of a Core 82 made of electrically conductive material and a jacket 84 surrounding this core electrically insulating material.
  • the core is 82 preferably in the counter potential connecting element 72 inserted axially and through one into the Connection element inserted radially to the core 82 Screw 86 in the counter potential connection element 72 releasably attached.
  • the conduit 70 is non-rotatable and also in Device axial direction fixed to ring 51 connected such that the electrical conduction path 70 only together with the ring 51 on the body 4 attached or detached from it, but not individually. This ensures that for spray coating without counter electrodes 52 not only the ring 51 with the counter electrodes 52, but also forcibly the route 70 Will get removed. That is at the same time ensures that when spray coating with Counterelectrodes 52 always include the conduction path 70 is fully available and effective.
  • the electrical conduction path 70 has the shape of a electrical cable or a limited flexible Staff.
  • the ring 51 with the counter electrodes 52 and Route 70 can at this or in modified embodiment a rotation relative to the body 4 around the Material channel 14 are prevented that the in Longitudinal direction of the material channel 14 extending Side surfaces 90 of the recess 57 only one of the Width of the line path 70 corresponding distance from each other and thereby the route 70 on a movement in the circumferential direction around the Prevent material channel 14.
  • sealing rings 92 are preferably sealing rings 92.
  • the body 4 can be made from one piece or from consist of several parts.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Spray Control Apparatus (AREA)
  • Formation And Processing Of Food Products (AREA)
EP96108654A 1995-08-02 1996-05-30 Elektrostatische Sprühvorrichtung für Beschichtungsmaterial Expired - Lifetime EP0756899B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19528398 1995-08-02
DE19528398A DE19528398A1 (de) 1995-08-02 1995-08-02 Elektrostatische Sprühvorrichtung für Beschichtungsmaterial

Publications (3)

Publication Number Publication Date
EP0756899A2 EP0756899A2 (de) 1997-02-05
EP0756899A3 EP0756899A3 (de) 1997-08-20
EP0756899B1 true EP0756899B1 (de) 1999-11-17

Family

ID=7768517

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96108654A Expired - Lifetime EP0756899B1 (de) 1995-08-02 1996-05-30 Elektrostatische Sprühvorrichtung für Beschichtungsmaterial

Country Status (8)

Country Link
US (1) US5720436A (xx)
EP (1) EP0756899B1 (xx)
JP (1) JP3763893B2 (xx)
AT (1) ATE186658T1 (xx)
CA (1) CA2179964C (xx)
DE (2) DE19528398A1 (xx)
MX (1) MX9603103A (xx)
TR (1) TR199600639A1 (xx)

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DE19926926A1 (de) 1999-06-14 2000-12-21 Itw Gema Ag Sprühbeschichtungseinrichtung
JP4989014B2 (ja) * 2000-09-29 2012-08-01 グラコ ミネソタ インコーポレーテッド 静電スプレーガン
DE10150759B4 (de) * 2001-10-13 2019-02-14 Gema Switzerland Gmbh Pulverspritzpistole für Beschichtungspulver
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US20050056212A1 (en) * 2003-09-15 2005-03-17 Schaupp John F. Split shroud for coating dispensing equipment
US20050173556A1 (en) * 2004-02-09 2005-08-11 Kui-Chiu Kwok Coating dispensing nozzle
US7360724B2 (en) * 2004-10-20 2008-04-22 The Procter & Gamble Company Electrostatic spray nozzle with internal and external electrodes
US7748343B2 (en) * 2004-11-22 2010-07-06 The Board Of Trustees Of The University Of Illinois Electrohydrodynamic spraying system
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US8016744B2 (en) 2005-02-24 2011-09-13 Ethicon Endo-Surgery, Inc. External pressure-based gastric band adjustment system and method
US7699770B2 (en) 2005-02-24 2010-04-20 Ethicon Endo-Surgery, Inc. Device for non-invasive measurement of fluid pressure in an adjustable restriction device
US7927270B2 (en) 2005-02-24 2011-04-19 Ethicon Endo-Surgery, Inc. External mechanical pressure sensor for gastric band pressure measurements
US8066629B2 (en) 2005-02-24 2011-11-29 Ethicon Endo-Surgery, Inc. Apparatus for adjustment and sensing of gastric band pressure
US7658196B2 (en) 2005-02-24 2010-02-09 Ethicon Endo-Surgery, Inc. System and method for determining implanted device orientation
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US8870742B2 (en) 2006-04-06 2014-10-28 Ethicon Endo-Surgery, Inc. GUI for an implantable restriction device and a data logger
US8152710B2 (en) 2006-04-06 2012-04-10 Ethicon Endo-Surgery, Inc. Physiological parameter analysis for an implantable restriction device and a data logger
GB0625583D0 (en) * 2006-12-21 2007-01-31 Itw Ltd Paint spray apparatus
US8371517B2 (en) 2007-06-29 2013-02-12 Illinois Tool Works Inc. Powder gun deflector
ES2527489T3 (es) * 2007-07-10 2015-01-26 Finishing Brands Holdings Inc. Aparato y método de dispensación de material de revestimiento
US20090020626A1 (en) * 2007-07-16 2009-01-22 Illinois Tool Works Inc. Shaping air and bell cup combination
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US8142452B2 (en) 2007-12-27 2012-03-27 Ethicon Endo-Surgery, Inc. Controlling pressure in adjustable restriction devices
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US8337389B2 (en) 2008-01-28 2012-12-25 Ethicon Endo-Surgery, Inc. Methods and devices for diagnosing performance of a gastric restriction system
US8591395B2 (en) 2008-01-28 2013-11-26 Ethicon Endo-Surgery, Inc. Gastric restriction device data handling devices and methods
US8192350B2 (en) 2008-01-28 2012-06-05 Ethicon Endo-Surgery, Inc. Methods and devices for measuring impedance in a gastric restriction system
US7844342B2 (en) 2008-02-07 2010-11-30 Ethicon Endo-Surgery, Inc. Powering implantable restriction systems using light
US8221439B2 (en) 2008-02-07 2012-07-17 Ethicon Endo-Surgery, Inc. Powering implantable restriction systems using kinetic motion
US8114345B2 (en) 2008-02-08 2012-02-14 Ethicon Endo-Surgery, Inc. System and method of sterilizing an implantable medical device
US8591532B2 (en) 2008-02-12 2013-11-26 Ethicon Endo-Sugery, Inc. Automatically adjusting band system
US8057492B2 (en) 2008-02-12 2011-11-15 Ethicon Endo-Surgery, Inc. Automatically adjusting band system with MEMS pump
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JP5854322B2 (ja) * 2011-11-30 2016-02-09 いすゞ自動車株式会社 静電塗装方法
CN106413910B (zh) * 2014-04-04 2020-07-31 固瑞克明尼苏达有限公司 具有外部充电点的静电喷枪
CN113710368B (zh) * 2019-04-05 2023-01-06 固瑞克明尼苏达有限公司 静电喷枪上的外部充电探针的安装
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Also Published As

Publication number Publication date
DE19528398A1 (de) 1997-02-06
TR199600639A1 (xx) 1998-02-21
EP0756899A3 (de) 1997-08-20
MX9603103A (es) 1998-04-30
CA2179964A1 (en) 1997-02-03
CA2179964C (en) 1999-08-31
JP3763893B2 (ja) 2006-04-05
JPH09103714A (ja) 1997-04-22
ATE186658T1 (de) 1999-12-15
US5720436A (en) 1998-02-24
DE59603660D1 (de) 1999-12-23
EP0756899A2 (de) 1997-02-05

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