EP0756899A2 - Dispositif de pulvérisation électrostatique de matériau de revêtement - Google Patents

Dispositif de pulvérisation électrostatique de matériau de revêtement Download PDF

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Publication number
EP0756899A2
EP0756899A2 EP96108654A EP96108654A EP0756899A2 EP 0756899 A2 EP0756899 A2 EP 0756899A2 EP 96108654 A EP96108654 A EP 96108654A EP 96108654 A EP96108654 A EP 96108654A EP 0756899 A2 EP0756899 A2 EP 0756899A2
Authority
EP
European Patent Office
Prior art keywords
conduit
channel
electrostatic spraying
spraying device
sleeve
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.)
Granted
Application number
EP96108654A
Other languages
German (de)
English (en)
Other versions
EP0756899B1 (fr
EP0756899A3 (fr
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/fr
Publication of EP0756899A3 publication Critical patent/EP0756899A3/fr
Application granted granted Critical
Publication of EP0756899B1 publication Critical patent/EP0756899B1/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
    • 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.
  • the known spraying device for coating powder has a plurality of counter electrodes which are arranged in a ring coaxial to a powder channel upstream of a spray nozzle which sprays the coating material onto an object to be coated.
  • a charging electrode connected to high electrical voltage in the range between 4000 and 14000 volts is arranged in the vicinity of the spray opening of the spray nozzle for the electrostatic charging of the coating material.
  • the counter electrodes are connected to a counter potential, preferably ground potential, by means of which free charges (electrons, ions) are drawn to the counter electrode from the electrical space charge generated by the charging electrode and are diverted to the counter potential.
  • the counter electrodes are electrically connected via an electrical conduction path to an electrical connection element at the rear end of the device, to which the counter potential can be connected.
  • the ring which carries the counter electrodes is inseparable from a sleeve and is not relative to the sleeve movably connected, which holds the spray nozzle in position against a base body of the spray device. The sleeve is screwed onto the base body.
  • the electrical conduction path for discharging the electrical charges from the counter electrodes is constructed in two parts and the two conduction path parts are detachably connected to one another by a slip ring connection.
  • a spray device with counter electrodes or in another case a spray device without counter electrodes can bring better coating results.
  • the counterelectrode device consists of a ring which can be plugged onto the front end section of the spraying device and which carries a plurality of counterelectrodes, and an electrical conduction path in the form of a plastic rod and a electrical conductor accommodated therein, which extends backwards from the ring.
  • the entire counter electrode device is thus attached to the outer periphery of the spray device and can be easily attached or removed.
  • spray devices can also be retro-fitted with such a counter-electrode device.
  • the disadvantage is that the counter electrode device can easily become dirty and the conduction path and the ring must be of a stable construction.
  • the object of the invention is to provide an electrostatic spraying device for coating powder and for liquid coating material in such a way that it is based on can be used in a simple manner with or without counter electrodes, in the second case forgetting of counter electrode line parts in the spray device should be reliably prevented without these counter electrode line parts having to be attached externally to the spray device.
  • This object is achieved according to the invention by the features of claim 1.
  • the electrostatic spray device according to the invention can be designed for spraying coating powder or coating liquid.
  • the electrostatic spraying device shown in FIG. 1 is used for spray coating with coating powder which, after spraying onto an object to be coated, is melted and baked onto this object.
  • the spray device 1 can be used in a modified form for spraying liquid coating material.
  • the spray device 1 contains a body 4 made of electrically insulating material, a tube 8 made of electrically insulating material axially passing through the body 4, an intermediate piece 12 or web part adjoining the body 4 and the tube 8 downstream, and a nozzle 10 adjoining it downstream each made of electrically insulating material.
  • the tube 8, the intermediate piece 12, a bushing 6 surrounding it and the nozzle 10 form a material channel or powder channel 14 with a channel axis 16, through which an upstream rear device part 15, which is carried by or is part of the body 4, Powder is conveyed pneumatically to the nozzle 10 and through a spray opening 18 formed in the nozzle 10.
  • the nozzle 10 may include a metal insert in which the spray opening 18 is formed.
  • the powder is sprayed through the spray opening 18 onto an object to be coated.
  • the intermediate piece 12 is a narrow plate, on which the coating material can flow axially past.
  • the intermediate piece 12 carries a needle-shaped charging electrode 20 in an air duct 24 in the duct axis 16, so that compressed air from the air duct 24 flows around the charging electrode 20 and its electrode tip 21 near the spray opening 18.
  • the charging electrode 20 is via an electrical conductor 26 in the intermediate piece 12, electrical contacts 28 and 29, an electrical resistance column 25 and a compression spring 27 are connected to a front high-voltage output 30 of a high-voltage generator 32.
  • the high voltage generator 32 is preferably a known cascade circuit made up of electrical resistors, capacitors and rectifiers.
  • the high voltage generator 32, the compression spring 27 and the electrical resistance column 25 are located in a through opening 36 which extends parallel to the material channel 14 through the body 4.
  • the through opening 36 and also the body 4 have in the region of the high voltage generator 32 opposite the front section 38 of the Body 4 has an expanded volume.
  • the resistance column 25 is accommodated in the lower section 38, which is lower relative thereto.
  • the high voltage generator 32 has a low voltage input 34 on the rear device part 15 for connection to an external electrical low voltage source.
  • the low voltage is, for example, in the range 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 be removed from the body 4 to the rear. After the intermediate piece 12 has been pulled out axially, the electrical contacts 28 and 29 are separated, the resistance column 25 can be pulled forward out of the body 4.
  • the body 4 is provided on its cylindrical front end section 38 with an external thread 40, onto which a sleeve 42 made of electrically insulating material is screwed with its internal thread 41.
  • the sleeve 42 is pushed over the nozzle 10 and presses with a rearward-facing radial end face 44 against a forward-facing radial end face 46 of the nozzle 10.
  • the sleeve 42 clamps the nozzle 10 and the intermediate piece 12 against a forward-facing radial end face 48 of the body 4.
  • the axially parallel through opening 36 ends in this forward-facing radial end face 48 of the body 4.
  • the sleeve 42 is extended beyond its internal thread 41 to the rear by a rear sleeve section 50.
  • the cylindrical front section 38 of the body 4 has, behind its external thread 40, a thread-free section 53 with a preferably slightly larger diameter than the external thread 40, and then behind it a rear end part 55 with a larger diameter, which has a diameter equal to the external diameter of the Has sleeve 42 so that it is axially aligned with the outer surface of the sleeve 42.
  • the counter electrodes 52 are located in radial bores 56 which are formed in the ring 51 and open into its outer surface 58.
  • the ring 51 extends axially to the channel axis 16 around the material channel 14, there being a radial and an axial distance between the counter electrodes 52 and the charging electrode 20.
  • a slit-like recess 57 is formed, which extends from the rear end portion 55 of the front portion 38 of the body 4 to the external thread 40 and, with the exception of a small radial through opening 59, is covered by the sleeve 42 .
  • the radial through opening 59 is formed between the rear end 61 of the sleeve 42 and the opposite rear end wall 63 of the recess 57.
  • the inner diameter of the ring 51 is only very slightly (less than 1 mm) larger than the outer diameter of the sleeve 42.
  • the ring 51 is also positioned in the forward, backward, and circumferential directions around the material channel 14 by an electrical conduction path 70 which extends from the radially inner ends of the counter electrodes 52 to an electrical counter potential connector 72 at the rear end of the rear device portion 55 substantially extends parallel to the material channel 14 so that the counter electrodes 52 can be connected to an electrical counter potential, preferably ground potential, via the connecting element 72.
  • This electrical counter potential differs from the electrical high voltage potential of the charging electrode 20 in such a way that the counter electrodes 52 Attract free electrons and ions from the electrical space charge cloud of the charging electrode 20, which are derived from the counter potential.
  • the counter electrodes 52 are located as close as possible to the spray opening 18 in order to have the best electrical efficiency.
  • the counter electrodes 52 must be so far away 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, but no electrical charges of the high-voltage electrode 20 required to charge the coating material.
  • the counter electrodes 52 can have a different shape, for example be formed by an electrode ring.
  • the electrical conduction path 70 for the counter electrodes 52 consists in one piece of a front conduction path section 74 in the ring 51, which then extends essentially radially from the ring 51 through the radial through opening 59 between the sleeve 42 and the front end face 63 of the recess 57 pointing forward Intermediate section 76, and a rearward connecting conduction path section 78 in a through hole 80, which extends 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 provided at its rear end with the counter-potential connection element 72 and ends at its front end in the forward-facing rear end face 63 of the recess 57 radially within this recess 57.
  • the line 70 has a through the radial intermediate piece 76 Z-shape, right-angled shape. Since the conduit through bore 80 of the body 4 is deeper than the external thread 40 of the body 4, at least the rear conduit section 78 of the conduit 70 must be flexible so that it can pass through the recess 57 forward through the thread 40 from the conduit through hole 80 can be pulled out or vice versa can be inserted into the line path through hole 80.
  • the intermediate line path section 76 lies between the rear end 61 of the sleeve 42 and the forward-facing rear end face 63 of the body 4 and is axially positioned between these two elements, whereby the ring 51 is also axially positioned.
  • the rear conduit section 78 preferably has little clearance in the conduit through-hole 80 to the surrounding bore wall of the body 4, so that the rear conduit section 78 in the conduit through-hole 80 is substantially stationary in the circumferential direction around the material channel 14 with little clearance is positioned, with which the ring 51 in Circumferential direction around the material channel 14 is positioned stationary.
  • the conduction path 70 preferably consists of a core 82 made of electrically conductive material and a jacket 84 surrounding this core made of electrically insulating material.
  • the core 82 is preferably inserted axially into the counter potential connection element 72 and detachably fastened in the counter potential connection element 72 by a screw 86 inserted radially to the core 82.
  • the conduction path 70 is rotationally fixed and also firmly connected to the ring 51 in the device axial direction, such that the electrical conduction path 70 can only be attached to or removed from the body 4 together with the ring 51, but not individually. This ensures that not only the ring 51 with the counter electrodes 52, but also the conduction path 70 is forcibly removed for the spray coating without counter electrodes 52. This ensures at the same time that when spray coating with counter electrodes 52, the conduction path 70 is always completely present and effective.
  • the electrical conduction path 70 is in the form of an electrical cable or a limited flexible rod.
  • the ring 51 with the counter electrodes 52 and the conduction path 70 can in this or in a modified embodiment also be prevented from rotating relative to the body 4 around the material channel 14 by the side surfaces 90 of the recess 57 running in the longitudinal direction of the material channel 14 only one of the Have the width of the line path 70 corresponding distance from each other and thereby prevent the line path 70 from moving in the circumferential direction around the material channel 14.
  • Sealing rings 92 are preferably located between the ring 51 and the opposite outer peripheral surfaces of the body 4 and the sleeve 42.
  • the body 4 can consist of one piece or of several parts.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Spray Control Apparatus (AREA)
EP96108654A 1995-08-02 1996-05-30 Dispositif de pulvérisation électrostatique de matériau de revêtement Expired - Lifetime EP0756899B1 (fr)

Applications Claiming Priority (2)

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

Publications (3)

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

Family

ID=7768517

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96108654A Expired - Lifetime EP0756899B1 (fr) 1995-08-02 1996-05-30 Dispositif de pulvérisation électrostatique de matériau de revêtement

Country Status (8)

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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10150759A1 (de) * 2001-10-13 2003-04-17 Itw Gema Ag Pulverspritzpistole für Beschichtungspulver
CN102357436A (zh) * 2011-08-08 2012-02-22 顾星 一种静电喷雾器
WO2020206236A1 (fr) * 2019-04-05 2020-10-08 Graco Minnesota Inc. Montage de sonde de charge externe sur un pistolet de pulvérisation électrostatique

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DE19926926A1 (de) 1999-06-14 2000-12-21 Itw Gema Ag Sprühbeschichtungseinrichtung
DE60128715T2 (de) * 2000-09-29 2007-10-25 Graco Minnesota Inc., Minneapolis Elektrostatische niederspannungsaufladung
US7128277B2 (en) 2003-07-29 2006-10-31 Illinois Tool Works Inc. Powder bell with secondary charging electrode
US20050023385A1 (en) * 2003-07-29 2005-02-03 Kui-Chiu Kwok Powder robot gun
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US7793869B2 (en) * 2003-08-18 2010-09-14 Nordson Corporation Particulate material applicator and pump
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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
US7775966B2 (en) 2005-02-24 2010-08-17 Ethicon Endo-Surgery, Inc. Non-invasive pressure measurement in a fluid adjustable restrictive device
US7927270B2 (en) 2005-02-24 2011-04-19 Ethicon Endo-Surgery, Inc. External mechanical pressure sensor for gastric band pressure measurements
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
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
US7775215B2 (en) 2005-02-24 2010-08-17 Ethicon Endo-Surgery, Inc. System and method for determining implanted device positioning and obtaining pressure data
US8152710B2 (en) 2006-04-06 2012-04-10 Ethicon Endo-Surgery, Inc. Physiological parameter analysis for an implantable restriction device and a data logger
US8870742B2 (en) 2006-04-06 2014-10-28 Ethicon Endo-Surgery, Inc. GUI 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
JP5373784B2 (ja) * 2007-07-10 2013-12-18 イリノイ トゥール ワークス インコーポレイティド 塗装材料の放出装置および放出方法
US20090020626A1 (en) * 2007-07-16 2009-01-22 Illinois Tool Works Inc. Shaping air and bell cup combination
US8096264B2 (en) * 2007-11-30 2012-01-17 Illinois Tool Works Inc. Repulsion ring
US8187163B2 (en) 2007-12-10 2012-05-29 Ethicon Endo-Surgery, Inc. Methods for implanting a gastric restriction device
US8100870B2 (en) 2007-12-14 2012-01-24 Ethicon Endo-Surgery, Inc. Adjustable height gastric restriction devices and methods
US8377079B2 (en) 2007-12-27 2013-02-19 Ethicon Endo-Surgery, Inc. Constant force mechanisms for regulating restriction devices
US8142452B2 (en) 2007-12-27 2012-03-27 Ethicon Endo-Surgery, Inc. Controlling pressure in adjustable restriction devices
US8591395B2 (en) 2008-01-28 2013-11-26 Ethicon Endo-Surgery, Inc. Gastric restriction device data handling devices and methods
US8337389B2 (en) 2008-01-28 2012-12-25 Ethicon Endo-Surgery, Inc. Methods and devices for diagnosing performance of a gastric restriction system
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
US8034065B2 (en) 2008-02-26 2011-10-11 Ethicon Endo-Surgery, Inc. Controlling pressure in adjustable restriction devices
US8233995B2 (en) 2008-03-06 2012-07-31 Ethicon Endo-Surgery, Inc. System and method of aligning an implantable antenna
US8187162B2 (en) 2008-03-06 2012-05-29 Ethicon Endo-Surgery, Inc. Reorientation port
US10155233B2 (en) * 2008-04-09 2018-12-18 Carlisle Fluid Technologies, Inc. Splash plate retention method and apparatus
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
US10926275B1 (en) 2020-06-25 2021-02-23 Graco Minnesota Inc. Electrostatic handheld sprayer
DE102020130197A1 (de) * 2020-11-16 2022-05-19 Gema Switzerland Gmbh Beleuchtungseinrichtung für eine sprühpistole sowie sprühpistole mit einer derartigen beleuchtungseinrichtung

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10150759A1 (de) * 2001-10-13 2003-04-17 Itw Gema Ag Pulverspritzpistole für Beschichtungspulver
US6935583B2 (en) 2001-10-13 2005-08-30 Itw Gema Ag Coating-powder spray gun
DE10150759B4 (de) 2001-10-13 2019-02-14 Gema Switzerland Gmbh Pulverspritzpistole für Beschichtungspulver
CN102357436A (zh) * 2011-08-08 2012-02-22 顾星 一种静电喷雾器
WO2020206236A1 (fr) * 2019-04-05 2020-10-08 Graco Minnesota Inc. Montage de sonde de charge externe sur un pistolet de pulvérisation électrostatique
US12233430B2 (en) 2019-04-05 2025-02-25 Graco Minnesota Inc. Mounting of external charging probe on electrostatic spray gun

Also Published As

Publication number Publication date
EP0756899B1 (fr) 1999-11-17
EP0756899A3 (fr) 1997-08-20
US5720436A (en) 1998-02-24
DE59603660D1 (de) 1999-12-23
CA2179964C (fr) 1999-08-31
JPH09103714A (ja) 1997-04-22
MX9603103A (es) 1998-04-30
ATE186658T1 (de) 1999-12-15
CA2179964A1 (fr) 1997-02-03
DE19528398A1 (de) 1997-02-06
TR199600639A1 (xx) 1998-02-21
JP3763893B2 (ja) 2006-04-05

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