EP0453745A1 - Méthode et dispositif pour nettoyage intérieur d'un conduit amenant de la poudre, en particulier un tuyau souple d'un dispositif pour le revêtement par poudrage électrostatique - Google Patents

Méthode et dispositif pour nettoyage intérieur d'un conduit amenant de la poudre, en particulier un tuyau souple d'un dispositif pour le revêtement par poudrage électrostatique Download PDF

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Publication number
EP0453745A1
EP0453745A1 EP91103603A EP91103603A EP0453745A1 EP 0453745 A1 EP0453745 A1 EP 0453745A1 EP 91103603 A EP91103603 A EP 91103603A EP 91103603 A EP91103603 A EP 91103603A EP 0453745 A1 EP0453745 A1 EP 0453745A1
Authority
EP
European Patent Office
Prior art keywords
powder
hose
granules
granule
container
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
EP91103603A
Other languages
German (de)
English (en)
Other versions
EP0453745B1 (fr
Inventor
Peter Brielmaier
Manfred Schüler
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.)
J Wagner GmbH
Original Assignee
J Wagner 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 J Wagner GmbH filed Critical J Wagner GmbH
Publication of EP0453745A1 publication Critical patent/EP0453745A1/fr
Application granted granted Critical
Publication of EP0453745B1 publication Critical patent/EP0453745B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
    • B08B9/053—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction
    • B08B9/057—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction the cleaning devices being entrained discrete elements, e.g. balls, grinding elements, brushes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids

Definitions

  • the invention relates to a method and a device for cleaning the inside of a powder-carrying line, in particular a hose line, of an electrostatic powder coating system, in particular in the event of a color change.
  • the powder-carrying connecting lines in particular powder hoses
  • the powder-carrying connecting lines in particular powder hoses
  • cabin and container cleaning where cleaning is done manually, for example, with a broom or with automatically moving brush and blow systems
  • powder hoses have so far only been able to be cleaned more or less inadequately by blowing compressed air through them.
  • the powder of the new color must then first be sprayed "into the void", but this also offers no security and is understandably uneconomical. In practice, therefore, the procedure is usually that the powder hoses are changed when the color changes such that there is a separate hose for each color type.
  • the object of the present invention is therefore to provide a simple, quick to carry out and nevertheless very effective method for cleaning the inside of powder-carrying lines without having to dismantle the lines on the spray guns or the automatic movement machines carrying the spray guns.
  • the solution to this problem results from the characterizing features of patent claim 1.
  • the internal cleaning of the powder-carrying lines takes place in that granules are passed through the line to be cleaned at a comparatively high speed. It is then only necessary to dismantle the line from the powder supply container and connect it to a granule supply, whereas dismantling the line on the spray gun or on the automatic machine is superfluous because the granules are discharged by the spray gun, the powder-carrying lines of which are also cleaned in the process.
  • the lines containing powder residues are remarkably effectively cleaned by the granules which are passed through, the powder carried by the granules during this cleaning being able to be separated off in a simple manner and can be reused.
  • 10 denotes a storage container for the granules used for cleaning.
  • the container 10 there is an inclined sieve 11 which on the one hand serves to feed the granules to an injector 12 attached to the container outlet and on the other hand to separate out granules of small grain size.
  • the injector 12 is connected on the one hand to a compressed air supply 13, while its outlet, for example by means of a quick coupling, can be connected to the powder supply hose 15 of a powder spray gun 16 to be cleaned.
  • the gun 16 its powder feed hose 15 is connected to a powder feed (not shown), for example the injector of a powder supply and processing container. If the hose 15 is now to be cleaned for a color change, the hose 15 is removed from the injector of the powder container and installed at the outlet of the injector 12. If compressed air is now supplied to the injector 12 through the line 13, the injector 12 removes 10 granules from the granule container and passes a granule-air mixture through the hose line 15 into the spray gun 16, which releases the granule-air mixture in the spraying direction.
  • the nozzle part of the spray gun 16 is preferably removed for this cleaning phase, especially if it is a nozzle part with a baffle.
  • a simple return hose 17 is attached to the front part of the gun, with a cyclone-like strainer basket in the form of a wire basket 18 arranged at its free end to which a separation air nozzle 20 connected to a compressed air supply 19 and a granulate collecting container 21 are assigned.
  • the granulate-powder-air mixture emerging from the return hose 17 passes into the wire basket 18 and is separated there by the separating air emerging from the nozzle 20, such that the granulate falls down into the collecting container 21, whereas the compressed air and the the powder they carry to a powder filter (not shown) or to the usual cabin cleaning filter, where the powder is separated from the air and recycled.
  • the compressed air supply lines 13 and 19 are switched off and the powder hose 15 is removed from the injector 12 and connected to the supply line for the new powder of the next coating process.
  • the granules are preferably plastic granules that generate as little frictional charge as possible, for example from polyamide granules.
  • the grain size of the granules should be between 1 and 3 mm, preferably 1.5 mm.
  • the amount of air used to transport the granules is preferably about a power of ten above that usually used for powder coating. In practice, this is achieved in a simple manner in that the injector 12 is fed directly from the compressed air network, which usually has a pressure of 7 bar, that is to say without the interposition of a pressure reducer, and by using an injector nozzle which is larger in comparison to powder coating; for powder coating, as is known, the network pressure mentioned for feeding the powder injector is considerably reduced.
  • the granule density in the granule-air stream passing through the hose to be cleaned can be chosen such that there are distances between the individual granules; the granules do not move "laminarly” within the tube, but rather carry out irregular (“prancing and helical") forward movements so that they are thrown on their way from one side of the hose wall to another side of the hose wall and thereby remove powder residues from the inner wall of the hose.
  • the injector 12 attached to the container 10 for the granulate, as well as the wire basket 18 for the return of the granulate, can be designed so that several hoses can be connected to it at the same time, so that several systems can be cleaned at the same time.
  • the electrostatically neutral plastic granulate mentioned one can also be selected which, when cleaning, charges the opposite charge to the powder, so that the two charges then almost equalize.
  • the sieve basket 18 can also have a different shape and form for separating the granules and recycling them.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Spray Control Apparatus (AREA)
  • Coating Apparatus (AREA)
EP91103603A 1990-04-24 1991-03-08 Méthode et dispositif pour nettoyage intérieur d'un conduit amenant de la poudre, en particulier un tuyau souple d'un dispositif pour le revêtement par poudrage électrostatique Expired - Lifetime EP0453745B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4013060 1990-04-24
DE4013060A DE4013060C1 (en) 1990-04-24 1990-04-24 Removing powder from spray gun tubing - by blowing down compressed air plus granules of larger particle size than powder and blowing at speed equal to air-powder draught

Publications (2)

Publication Number Publication Date
EP0453745A1 true EP0453745A1 (fr) 1991-10-30
EP0453745B1 EP0453745B1 (fr) 1994-05-25

Family

ID=6404984

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91103603A Expired - Lifetime EP0453745B1 (fr) 1990-04-24 1991-03-08 Méthode et dispositif pour nettoyage intérieur d'un conduit amenant de la poudre, en particulier un tuyau souple d'un dispositif pour le revêtement par poudrage électrostatique

Country Status (4)

Country Link
US (1) US5170591A (fr)
EP (1) EP0453745B1 (fr)
JP (1) JPH0665388B2 (fr)
DE (2) DE4013060C1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4420579A1 (de) * 1994-06-03 1995-12-07 Meyer & John Gmbh & Co Verfahren zum Reinigen von Rohrleitungen
CN102145340A (zh) * 2010-11-23 2011-08-10 瓮福（集团）有限责任公司 一种列管加热器的机械清理方法
US11950677B2 (en) 2019-02-28 2024-04-09 L'oreal Devices and methods for electrostatic application of cosmetics

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4417727A1 (de) * 1994-05-20 1995-11-23 Gema Volstatic Ag Schlauchbürste
JPH07313922A (ja) * 1994-05-24 1995-12-05 I T M Kk 色替用気体搬送粉体供給システム
US6223997B1 (en) 1998-09-17 2001-05-01 Nordson Corporation Quick color change powder coating system
DE29819052U1 (de) * 1998-10-26 2000-03-02 Wagner Gmbh J Fördervorrichtung
US6112999A (en) * 1998-11-13 2000-09-05 Steelcase Development Inc. Powder paint system and control thereof
US6705545B1 (en) 1998-11-13 2004-03-16 Steelcase Development Corporation Quick color change powder paint system
US7325750B2 (en) * 2000-10-05 2008-02-05 Nordson Corporation Powder coating system with improved overspray collection
US6695220B2 (en) 2001-01-11 2004-02-24 Herman Miller, Inc. Powder spray coating system
US20050178851A1 (en) * 2001-06-25 2005-08-18 Nordson Corporation Quick change powder coating spray system
JP6265503B2 (ja) * 2015-05-25 2018-01-24 株式会社 サン・テクトロ プリプレグ製造装置
CN113578567B (zh) * 2021-08-06 2022-08-23 宁波宇晓包装有限公司 一种具有抗菌性、耐老化、高强度喷枪生产工艺

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4248379A (en) * 1979-08-16 1981-02-03 Nordson Corporation Powder spray color change system
US4746063A (en) * 1985-11-05 1988-05-24 Roberts Gary S Cleaning of spraying apparatus
EP0332886A2 (fr) * 1988-03-12 1989-09-20 Klaus Bloch Matière de grenaillage thermoplastique

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US818776A (en) * 1905-05-05 1906-04-24 John D Murray Sand-blast apparatus.
US3667675A (en) * 1971-02-16 1972-06-06 Graco Inc Electrostatic powder coating apparatus
US4044507A (en) * 1976-05-12 1977-08-30 Silver Creek Minerals Corporation Method and apparatus for stripping, cleaning and treating surfaces
US4412402A (en) * 1978-07-28 1983-11-01 Cavitron Inc. Equipment and method for delivering an abrasive-laden gas stream
DE2930121C2 (de) * 1979-07-25 1982-05-27 Gema AG Apparatebau, 9015 St. Gallen Verfahren und Einrichtung zum Sprühbeschichten von Gegenständen mit Pulver
DE2849269C2 (de) * 1978-11-14 1980-11-27 Gema Ag, Apparatebau, St. Gallen (Schweiz) Verfahren zum Pulversprühen und pneumatische Pulversprüheinrichtung
GB2073630B (en) * 1980-04-12 1983-03-16 Ogle & Sons Ltd G C Sand-blasting equipment
DE3028588C2 (de) * 1980-07-28 1982-05-27 Gema AG Apparatebau, 9015 St. Gallen Pulver-Beschichtungsanlage
US4452169A (en) * 1982-09-24 1984-06-05 Shinich Matsuda Reviving apparatus for fluid passages
DE3408828A1 (de) * 1984-03-10 1985-09-12 Rudolf 4834 Harsewinkel Ristow Verfahren zum reinigen von oberflaechen, insbesondere von inneren oberflaechen lueftungstechnischer anlagen und anlagenteile
US4773189A (en) * 1985-11-01 1988-09-27 Macmillan Gregory D Separation system for polymeric blast media
US5011443A (en) * 1990-01-02 1991-04-30 Zenith Electronics Corporation Cleaning of flat glass CRT faceplate with internal anti-glare surface

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4248379A (en) * 1979-08-16 1981-02-03 Nordson Corporation Powder spray color change system
US4746063A (en) * 1985-11-05 1988-05-24 Roberts Gary S Cleaning of spraying apparatus
EP0332886A2 (fr) * 1988-03-12 1989-09-20 Klaus Bloch Matière de grenaillage thermoplastique

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4420579A1 (de) * 1994-06-03 1995-12-07 Meyer & John Gmbh & Co Verfahren zum Reinigen von Rohrleitungen
CN102145340A (zh) * 2010-11-23 2011-08-10 瓮福（集团）有限责任公司 一种列管加热器的机械清理方法
US11950677B2 (en) 2019-02-28 2024-04-09 L'oreal Devices and methods for electrostatic application of cosmetics

Also Published As

Publication number Publication date
JPH0665388B2 (ja) 1994-08-24
DE59101699D1 (de) 1994-06-30
JPH0584453A (ja) 1993-04-06
US5170591A (en) 1992-12-15
DE4013060C1 (en) 1991-11-21
EP0453745B1 (fr) 1994-05-25

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