EP0210949B1 - Dispositif pour appliquer une couche de poudre à la soudure du corps d'une boîte - Google Patents

Dispositif pour appliquer une couche de poudre à la soudure du corps d'une boîte Download PDF

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Publication number
EP0210949B1
EP0210949B1 EP19860810249 EP86810249A EP0210949B1 EP 0210949 B1 EP0210949 B1 EP 0210949B1 EP 19860810249 EP19860810249 EP 19860810249 EP 86810249 A EP86810249 A EP 86810249A EP 0210949 B1 EP0210949 B1 EP 0210949B1
Authority
EP
European Patent Office
Prior art keywords
powder
spray
spray chamber
suction
extraction device
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
Application number
EP19860810249
Other languages
German (de)
English (en)
Other versions
EP0210949A1 (fr
Inventor
Walo Steiger
Siegfried Frei
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AT86810249T priority Critical patent/ATE42695T1/de
Publication of EP0210949A1 publication Critical patent/EP0210949A1/fr
Application granted granted Critical
Publication of EP0210949B1 publication Critical patent/EP0210949B1/fr
Expired 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
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/12—Plant for applying liquids or other fluent materials to objects specially adapted for coating the interior of hollow bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/06—Applying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00—Metallic substrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes

Definitions

  • the invention relates to a device according to the preamble of claims 1 and 8.
  • the known devices for suctioning off powder particles outside the spray head or outside the can bodies to be coated consist of a funnel-shaped hood covering at least the entire cross-sectional area of the spray opening on the spray head. Such is also necessary in order to prevent the coating of the can bodies as a result of the spray chamber, i.e. in the interior of the can body overpressure prevailing on the inlet side and outlet side of the can body located above the spray opening to be able to suction powder air cloud escaping to the outside.
  • EP-A1-54 757 proposes an extraction hood that extends over the length of several can bodies.
  • Individual powder particles can also settle on the belts of the transport device arranged on the side, since these have a charge opposite to the electrical charge of the powder particles. This is because the belts are in contact with the can bodies, which must have an opposite charge to the powder particles. The powder particles that settle on the belt lead to contamination of the belt drives over time, and powder particles can also get to the outside of the can body.
  • the invention seeks to remedy this.
  • the invention solves the problem of creating a device which prevents the deposit of charged powder particles on the outside of the can bodies and the conveyor belts.
  • the novel suction device can be used to produce an extremely uniform layer thickness of the strip-like lacquer layer along the entire weld seam, since the distribution of the powder can no longer be disrupted by the air flow from the inside of the can for suction.
  • a deposition of powder particles on the hot outside of the weld seam is also avoided because the suction only takes place at the gaps and the extracted powder particles are immediately removed from the area of the can with high suction power.
  • Another advantage of the invention is that both the amount of suction air required to generate the negative pressure in the spraying space and the amount of suction air at the external suction can be kept considerably lower than in the known systems despite the higher efficiency.
  • the powder particles By attaching a charge opposite to the electrical charge of the powder particles between the spray chamber and the suction opening, the powder particles can additionally be prevented from settling on the belt because, attracted by the electric field of the charge, they do not leave their trajectory and go directly into the suction opening be directed.
  • the means for displacing the suction device above the spray opening in the transport direction of the can bodies enable the suction opening to be precisely aligned over the powder jet, the angle of which to the weld seam can vary depending on the transport speed of the can bodies.
  • the swiveling suction opening enables the powder jet to enter the suction line without deflection, so that a low vacuum can be used at the mouth.
  • FIG. 1 shows schematically a known seam welding machine 1 with the electrode rollers 2, 3, some freshly welded can bodies 4, the powder application device 5 with the spray head 6, the external suction 7 and the combined processing and reprocessing system 8 and a known heating device 9 for melting the Powder shown on the seam.
  • An electrical system for generating the high voltage for charging the powder is shown symbolically and designated by the reference number 10, the tip of the line (electrode) leading the high voltage in the spray head 6 is designated by the reference number 25.
  • the external suction is shown on a larger scale and is described in detail below.
  • a slot-shaped spray chamber 11 with an essentially rectangular spray opening 12 is arranged in the apex of the spray head 6, which is circular in the present example.
  • a powder feed line 13 and one or two suction lines 14 open into the bottom of the spray chamber 11 from below opposite the spray opening 12.
  • a slide or an adjustable diaphragm 15 for adjusting the cross-section of the mouth and the angle a of the powder jet 16 to the horizontal is placed on the mouth of the powder line 13.
  • an adjustable screen 15 a fixed screen 15 or another suitable element for partially covering or changing the mouth of the powder line 13 can also be provided.
  • the trajectory of the powder stream 16, the mouth part 17 of a line 18 connected to a suction source in the processing system 8 is located.
  • the mouth part 17 can be arranged in the housing 19 of the suction 7 or - as shown in FIGS. 2 and 3 - around a horizontal axis can be pivoted.
  • a bore 20 is formed in the mouth part 17 in a cylinder introduced into a cylindrical recess 21.
  • the adjustment block 23 having the recess 21 is displaceable in the housing 19 in the transport direction B of the can bodies 4. The displacement is a few millimeters, because the angle of the powder jet 16 must only be able to be adjusted slightly in practice.
  • the mouth part 17 can be turned by hand, for example with a screwdriver, through a recess 22 in the housing 19; there is also the possibility of coupling the longitudinal displacement movement of the adjusting block 23 mechanically synchronously with the mouth part 17 or the housing 19, so that the position of the bore 20 is adapted to the new geometry at the same time during a displacement.
  • a suction of powder particles takes place only when the powder jet 16 can pass through a space between two can bodies 4 which follow one another at a distance or when there are no can bodies 4. If, on the other hand, the powder jet 16 strikes the inside of the weld seam 24 located in the apex of the can body 4, i.e. the bore 20 is covered by the can body 4, the vacuum at the mouth of the bore 20 does not affect the powder application inside the can. There is also the possibility of switching on the suction only in the absence of a can body 4 in front of the mouth, so that a very small amount of suction air can be used.
  • a further suction line 26 serving as a suction opening can be fitted in the adjustment block 23, which comes to lie exactly above the tip 25 of the high-voltage line.
  • the suction generated by the suction line 26 over the tip 25 - each time the tip 25 is not covered by a can body 4 - has the effect that no powder particles can be deposited on the tip 25.
  • the suction line 26 can also be arranged in the housing 19, provided the adjustment block 23 extends only over the powder line 13.
  • the two suction devices can be individually connected to a vacuum source or - as shown in FIG. 2 - be connected together to the suction line 18.
  • the powder particles are charged positively, the can bodies 4 are charged negatively.
  • the charges can also be carried out in reverse.
  • the can bodies 4 are drawn over the spray opening 12 by means of rod-shaped magnets 27 attached to the belt 29, the lower strand of which rests on the magnets 27 and is attached to the belt 29.
  • the powder particles are positively charged in the spray chamber 11, the can bodies 4 receive the negative charge by brush contacts 31 (FIG. 1). Due to the intimate contact of the negatively charged can bodies 4 with the straps 29, these are also negatively charged.
  • a wire 31 is arranged which, like the can bodies 4, receives a negative charge and consequently forms a zone with a negative charge.
  • the wire 31 can be provided lying on the underside of the external suction 7 or at a short distance therefrom; it can also be inserted into a groove 33 (FIG. 3).
  • the distance of the wire 31 from the outlet opening 35 of the powder into the spray chamber 11 is less than the distance of the belts 29 from the outlet opening 35. Due to the strong charge of the wire 31 opposite the charge of the powder, the position of the wire 31 in the powder jet 16 and its smaller distance from the outlet opening 35 has the effect that, in the absence of a can body 4, the powder particles are drawn towards the wire 31 and, since this lies in front of the bore 20 of the suction 7 be sucked off completely. The straps 29 remain clean.
  • the electrical conductor consists of one or more wires 41, which end in a tip 43 in the region of the bore 20 and attract “stray” powder particles. The powder particles attracted by the tips 43 are immediately sucked out of the air flow into the bore 20.
  • the zone with the charge opposite to the powder particles can also be generated or used in coating systems with a funnel-shaped, conventional suction device that extends over more than the length of a can body.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)

Claims (13)

1. Dispositif d'aspiration pour aspirer la poudre dans une installation (5) d'application d'une couche de poudre sur le cordon de soudure (24) d'une boîte (4), comprenant une tête de pulvérisation (6) venant se disposer à l'intérieur de la boîte (4), avec une enceinte de pulvérisation (11) et une conduite d'alimentation de poudre (13) débouchant dans l'enceinte de pulvérisation (11) et une conduite d'aspiration (14) débouchant dans l'enceinte de pulvérisation (11 ), une électrode (25) raccordée à une source de haute tension (10) ainsi qu'un dispositif d'aspiration (7) disposé face à la tête de pulvérisation (6) à l'extérieur de celle-ci et au-dessus d'une ouverture de pulvérisation (12) de l'enceinte de pulvérisation (11), caractérisé en ce que la conduite d'alimentation de poudre débouche dans le fond de l'enceinte de pulvérisation (11 ) face à l'ouverture de pulvérisation (12), en ce que le dispositif d'aspiration (7) comprend une partie d'embouchure (17) de forme tubulaire, qui est disposé directement face à l'embouchure de la conduite à poudre (13) dans l'enceinte de pulvérisation (11) et sensiblement dans l'axe (A) du faisceau de poudre (16) sortant de la conduite de poudre (13).
2. Dispositif selon la revendication 1, caractérisé en ce que la partie d'embouchure (17) peut être déplacée le long de l'ouverture de pulvérisation (12).
3. Dispositif selon la revendication 1 ou la revendication 2, caractérisé en ce que la partie d'embouchure de forme tubulaire (17) du dispositif d'aspiration (7) peut pivoter autour d'un axe horizontal.
4. Dispositif selon l'une des revendications 1 à 3, caractérisé en ce que la partie d'embouchure (17) est montée dans un bloc réglable (23) qui est monté de façon mobile dans un boîtier fixe (19).
5. Dispositif selon la revendication 3, caractérisé en ce que la partie d'embouchure de forme tubulaire (17) est reliée mécaniquement en synchronisme avec le boîtier (19) du dispositif d'aspiration (7) et lorsqu'il y a déplacement du boîtier (19) peut pivoter ou être pivoté de l'extérieur au moyen d'un outil.
6. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que l'embouchure d'une autre conduite d'aspiration (26) est prévue au-dessus de la pointe (25) de l'électrode, en dehors de la tête de pulvérisation (6).
7. Dispositif selon la revendication 5, caractérisé en ce que la conduite d'aspiration (26) est prévue dans le bloc réglable (23) ou de façon fixe dans le boîtier (19).
8. Dispositif d'aspiration de poudre dans une installation (5) destinée à appliquer une couche de poudre sur le cordon de soudure (24) d'une boîte (4), comprenant une tête de pulvérisation (6) venant s'appliquer à l'intérieur de la boîte (4), une enceinte de pulvérisation (11) et une conduite d'alimentation de poudre (13) débouchant dans l'enceinte de pulvérisation (11), et une conduite d'aspiration (14) débouchant dans l'enceinte d de pulvérisation (11) une électrode (25) raccordée à une source de haute tension (10) ainsi qu'un dispositif d'aspiration (7) disposé face à la tête de pulvérisation (6), à l'extérieur de celle-ci et au-dessus d'une ouverture de pulvérisation (12) de l'enceinte de pulvérisation (11 ), caractérisé en ce qu'un conducteur électrique (31) ne touchant pas les boîtes (4) est disposé au-dessus de la tête de pulvérisation (6) au niveau de l'embouchure (17) de l'aspiration (7), ce conducteur présentant une charge électrique qui est de sens contraire à la charge des particules de poudre.
9. Dispositif selon la revendication 8, caractérisé en ce que l'on utilise en tant que conducteur un fil (31).
10. Dispositif selon la revendication 8 ou la revendication 9, caractérisé en ce que le fil (31) est monté parallèlement au dispositif transporteur ou à la courroie (29).
11. Dispositif selon la revendication 9 ou 10, caractérisé en ce que le fil (31) passe à l'intérieur du dispositif d'aspiration (7).
12. Dispositif selon la revendication 8, caractérisé en ce qu'on utilise en tant que conducteur un fil (41) dont la pointe (43) se termine dans ou directement sur le côté du faisceau de poudre (16).
13. Dispositif selon la revendication 12, caractérisé en ce que la pointe (43) est dirigée vers l'ouverture de pulvérisation (12).
EP19860810249 1985-07-22 1986-06-09 Dispositif pour appliquer une couche de poudre à la soudure du corps d'une boîte Expired EP0210949B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86810249T ATE42695T1 (de) 1985-07-22 1986-06-09 Vorrichtung zum auftragen einer pulverschicht auf die schweissnaht eines dosenrumpfes.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CH316585 1985-07-22
CH3165/85 1985-07-22
CH375785 1985-08-31
CH3757/85 1985-08-31

Publications (2)

Publication Number Publication Date
EP0210949A1 EP0210949A1 (fr) 1987-02-04
EP0210949B1 true EP0210949B1 (fr) 1989-05-03

Family

ID=25692353

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860810249 Expired EP0210949B1 (fr) 1985-07-22 1986-06-09 Dispositif pour appliquer une couche de poudre à la soudure du corps d'une boîte

Country Status (2)

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EP (1) EP0210949B1 (fr)
DE (1) DE3663115D1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3526027A (en) * 1967-05-29 1970-09-01 Continental Can Co Apparatus for coating side seam areas of containers
AU495645B2 (en) * 1975-09-23 1977-03-03 American Can Company Method and apparatus for powder coating metal articles
US4212266A (en) * 1978-12-21 1980-07-15 The Continental Group, Inc. Catcher and return device for oversprayed powder
US4346667A (en) * 1980-12-19 1982-08-31 The Continental Group, Inc. Inside powder striping apparatus
JPS59177164A (ja) * 1983-03-21 1984-10-06 ジ−グフリ−ト・フライ 円筒形の缶の本体の溶接継目上に条片状の粉末の層を付着させる方法と装置

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EP0210949A1 (fr) 1987-02-04
DE3663115D1 (en) 1989-06-08

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