EP1208915B1 - Procédé et dispositif de transfert de peintures électroconductrices entre des emplacements à potentiels différents - Google Patents

Procédé et dispositif de transfert de peintures électroconductrices entre des emplacements à potentiels différents Download PDF

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Publication number
EP1208915B1
EP1208915B1 EP01127818A EP01127818A EP1208915B1 EP 1208915 B1 EP1208915 B1 EP 1208915B1 EP 01127818 A EP01127818 A EP 01127818A EP 01127818 A EP01127818 A EP 01127818A EP 1208915 B1 EP1208915 B1 EP 1208915B1
Authority
EP
European Patent Office
Prior art keywords
varnish
conveying
conveying line
line
consumer
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
EP01127818A
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German (de)
English (en)
Other versions
EP1208915A2 (fr
EP1208915A3 (fr
Inventor
Winfried Ott
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.)
Lactec GmbH Gesellschaft fuer Moderne Lackiertechnik
Original Assignee
Lactec GmbH Gesellschaft fuer Moderne Lackiertechnik
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 Lactec GmbH Gesellschaft fuer Moderne Lackiertechnik filed Critical Lactec GmbH Gesellschaft fuer Moderne Lackiertechnik
Publication of EP1208915A2 publication Critical patent/EP1208915A2/fr
Publication of EP1208915A3 publication Critical patent/EP1208915A3/fr
Application granted granted Critical
Publication of EP1208915B1 publication Critical patent/EP1208915B1/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
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1608—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive
    • B05B5/1616—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to 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
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • B05B12/1481—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet comprising pigs, i.e. movable elements sealingly received in supply pipes, for separating different fluids, e.g. liquid coating materials from solvent or air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • B05B12/149—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet characterised by colour change manifolds or valves therefor

Definitions

  • the invention relates to a method for conveying electrically conductive paints from a supply system lying at ground potential, in particular a color changer, to a high-voltage consumer, in particular an electrostatic paint sprayer.
  • the invention has for its object to provide a simple structured method that requires a relatively low control effort and is also suitable for automatic quick color change systems.
  • the invention also relates to an apparatus for carrying out this method according to claim 5.
  • the aforementioned invention task namely to provide a device which is relatively simple, manages with a low control effort and is also useful for automatic quick color change systems.
  • the paint is discontinuously conveyed in individual quantities, wherein measured in the conveying direction longitudinal extent of the individual paint packages is considerably less than the length of the conveying path or the insulating conveying line, so that within this always a sufficient insulating gap remains. Because of this measure, the individual quantities of paint or paint packages can be easily transported in the high voltage range, for example by means of compressed air or an insulating liquid as a sliding medium, as described below with reference to the embodiment. Since the separation of the amounts of paint does not cause any difficulties, the inventive method and the associated device prove to be appropriate, simple and reliable.
  • the discontinuous transfer of the individual paint amounts requires at least partial buffering of the paint in the high-voltage range if the consumer is to be supplied continuously. Such caching can be avoided, however, if according to a particularly useful version, the divided quantities of paint are supplied via two conveyor lines or by two parallel conveyor lines, the paint delivery without interruption takes place alternately from the paint amounts of one and the other conveyor line or conveyor line.
  • the conveying device 1 comprises a conveying line 2 with a feeding station 3 near the rear line end 4 and a dispensing station 5 near the front line end 6.
  • the conveying line 2 is made of an electrically insulating material, eg plastic, and has between the loading station 3 and the dispensing station 5 a comparatively long length L on.
  • a discharge line 11 is connected to the delivery line 2 with a dispensing valve 12.
  • the discharge line 11 leads via a metering device 13 to a consumer 14, which is formed here by an electrostatic paint sprayer 15. At this high voltage is applied, so that a high voltage range indicated by dashed lines 16 is present, in which also the discharge station 5 falls.
  • the feeding system 7 and the feeding station 3 are located to earth potential, as indicated by a corresponding symbol.
  • a pair of pigs 17 is arranged with a rear pig 18 and a front pig 19, which can move like a piston in the longitudinal direction through the line 2, but completely fill their cross-section and so a dimensionally stable separator for on opposite sides in form the delivery line 2 located media.
  • the pigs 18 and 19 are held by a spacer 20 at a minimum distance from each other, as it FIG. 1 shows.
  • the two pigs 17, 18 occupy a greater distance from each other to accommodate a certain amount of paint 21 between them.
  • Such a quantity of paint 21 takes within the delivery line 2 a length l. It is important that this length l and thus the amount of paint 21 is not too large, so that the delivery line 2 still has a sufficient insulating length Ll, which prevents penetration of the high voltage from the high voltage region 16 to the charging station 3.
  • a compressed air line 24 is connected to the rear end 4 of the delivery line 2, which is connected via a compressed air valve 25 to a compressed air source 26 and provided with a vent valve 27 which is opened for the return transport of the pig pair 17 from the discharge station 5 to the loading station 3.
  • a return transport device 28 is otherwise provided, which is connected to the front end 6 of the delivery line 2 and formed otherwise as the transport device 23.
  • the return conveyor 28 comprises a compressed air line 29 with a compressed air valve 30 which is connected to a compressed air source 31 and provided with a vent valve 33.
  • the feed line 2 in the region of the feed station 3 is assigned a feed sensor 33 and in the region of the discharge station 5 a feed sensor 34. These sensors respond to the presence of pig pair 17 or package 22 in the sensor area.
  • a further parallel delivery line 2 ' is provided, which is equipped and connected in completely the same way as the delivery line 2, so apart from a detailed description and the same reference numerals an attached distinguishing mark.
  • the delivery line 2 ' is connected to the same color changer 8 and to the same common delivery line 11.
  • FIG. 1 are at the start of the pushed pig pairs 17 and 17 'in the feed station 3 and 3' of the delivery line 2 and 2 '.
  • the feed valve 10 is opened until the intended amount of paint 21 is introduced between the pigs 18, 19 and this has spread to the length 1, as it is made FIG. 2 is apparent.
  • FIG. 2 advances by 25 compressed air is brought behind the rear pig 18 by opening the compressed air valve, wherein at the same time the discharge-side vent valve 32 is opened.
  • FIG. 3 shows the package 22 with the amount of liquid 21 midway, now dividing the existing insulating distance Ll on two Isolierumblen before and behind the amount of liquid 21.
  • the package 22 'in the feed station 3' has been completed in the delivery line 2 '.
  • FIG. 4 is the paint package 22 arrived at the dispensing station 5, where it rests itself due to contact with high voltage. This arrival at the dispensing station 5 is detected by the dispensing sensor 34, whereupon the dispensing valve 12 is opened, so that the paint via the discharge line 11 according to the default by the metering device 13 slowly flows to the atomizer 15. According to FIG. 4 is a part of the amount of liquid 21 is already discharged, while the package 22 'with the amount of liquid 21' on the way to the dispensing station 5 ', for which the transport device 23' has been operated accordingly.
  • the dispensing sensor 34 in accordance with the forward movement of the rear pig 18 continuing to dispense the paint, determines the end of the depletion from the package 22, whereupon the controller closes the dispensing valve 12 and opens the dispensing valve 12 'so that now the atomizer 15 is clear of the paint amount 21 'continues to be supplied.
  • the pair of pigs 17 is moved back from the discharge station 5 in the loading station 3, as indicated by the arrow 35 in FIG. 5 is indicated.
  • the compressed air valve 25 are closed at the transport device 23 and the vent valve 27 is opened, while conversely at the return conveyor 28, the compressed air valve 30 is opened and the vent valve 32 are closed.
  • the state is again reached with regard to the delivery line 2, as it is in FIG. 1 is shown. It repeats the process already described, in which by a limited opening of the supply valve 10, a further amount of paint 21 is introduced between the pigs 18 and 19, which in turn takes place in the manner described, the transport to the dispensing station 5. In this case, the further amount of paint 21 also arrives at the dispensing station 5, before the amount of paint 21 'is completely discharged in the delivery station 5'.
  • FIG. 6 shows that the two pigs 18 and 19 are each formed in the same way and consist of a core 36 with a sheath 37 made of a plastic.
  • the spacer 20 is formed from a projecting from the pig 19 concentric to the delivery line 2 rod 38 with a rounded head 39.
  • the spacer 20 forms a spacer which prevents the collars 18 and 19 from colliding and sticking together when the pigs are pressed back.
  • the spacer 20 in the charging station 3 for the filling of the space sufficient distance between the two pigs 18, 19 always guaranteed.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Threshing Machine Elements (AREA)
  • Non-Mechanical Conveyors (AREA)

Claims (11)

  1. Procédé pour convoyer des vernis conducteurs d'un système d'alimentation (7) relié à un potentiel de terre, en particulier un changeur de couleur (8), vers un consommateur (14) relié à haute tension, en particulier un atomiseur électrostatique de vernis (15), dans lequel des quantités de vernis (21) individuelles séparées et de l'air comprimé comme milieu poussant isolant sont transportés à des intervalles spatiaux et temporaires à travers une conduite de convoyage (2, 2') entre le système d'alimentation (7) et le consommateur (14), la longueur (L) de la distance de convoyage de la conduite de convoyage (2, 2') excédant l'étendue (1) des quantités de vernis (21) individuelles en direction de convoyage par un montant (L-I) qui est une distance isolante suffisante, et l'air comprimé étant convoyer de retour, après arrivée des quantités de vernis (21) dans une station de décharge (5), dans la conduite de convoyage (2, 2') respective.
  2. Procédé selon la revendication 1, caractérisé en ce qu'il est effectué de telle façon qu'à aucun moment, plus qu'une seule quantité de vernis (21) séparée n'est présente dans la conduite de convoyage (2, 2') respective.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que des quantités de vernis (21, 21') séparées sont alimentées au consommateur (14) par au moins deux conduites de convoyage (2, 2') parallèles.
  4. Procédé selon la revendication 3, caractérisé en ce que, pour une alimentation continue du consommateur (14), des quantités de vernis (21 et 21') sont convoyées au consommateur (14) d'une façon dosée alternativement de l'une et de l'autre conduite de convoyage (2, 2').
  5. Dispositif pour effectuer le procédé selon la revendication 1, ayant une conduite de convoyage (2) pour vernis, insérée dans la connexion entre un système d'alimentation (7) relié à la terre, en particulier un changeur de couleur (8), et un consommateur (14) relié à haute tension, en particulier un atomiseur électrostatique (15), la conduite de convoyage (2) consistant en une matière isolante, au moins une paire de ramoneurs (17) consistant en un ramoneur arrière (18) et un ramoneur avant (19) étant ménagée dans la conduite de convoyage (2), une station de chargement (3) pour alimenter des quantités de vernis (21) séparées entre les deux ramoneurs (18, 19) étant attribuée à l'extrémité arrière (4) de la conduite de convoyage (2), une station de déchargement (5) pour écluser les quantités de vernis (21) séparées hors de la conduite de convoyage (2) étant attribuée à l'extrémité avant (4) de la conduite de convoyage (2), un dispositif de transport (23, 40) pour déplacer la paire de ramoneurs (17) avec une quantité prise de vernis (21) au moyen de l'air comprimé en tant que milieu poussant isolant, de la station de chargement (3) à la station de déchargement (5), ainsi qu'un dispositif de convoyage de retour (28) pour déplacer la paire de ramoneurs (17) de la station de déchargement (5) à la station de chargement (3) étant prévus, la longeur (L) de la conduite de convoyage (2) entre la station de chargement (3) et la station de déchargement (5) et la longueur (I) du paquet de la quantité de vernis (22) pris entre les ramoneurs (18, 19) étant dimensionnées de façon que les sections de la conduite de convoyage devant et derrière le paquet de la quantité de vernis (22) forment toujours une distance isolante d'une longueur (L-I) suffisante entre la station de chargement (3) et la station de déchargement (5), et la conduite de convoyage étant étudiée pour reconvoyer l'air comprimé après avoir déchargé la quantité de vernis (21).
  6. Dispositif selon la revendication 5, caractérisé en ce qu'une butée arrière (à 4) et une butée avant (à 6) sont prévues pour la paire de ramoneurs (17) déplacée dans les deux sens à travers la conduite de convoyage (2) au moyen des dispositifs de transport (23, 28; 40).
  7. Dispositif selon la revendication 5 ou 6, caractérisé en ce que, entre les deux ramoneurs (18, 19), une pièce d'écartement (20) est prévue, empêchant un contact direct entre les ramoneurs (18, 19).
  8. Dispositif selon l'une quelconque des revendications 5 à 7, caractérisé en ce qu'un dispositif de commande est prévu, comprenant un ou plusieurs capteurs arrières (33) attribués à la station de chargement (3) et un ou plusieurs capteurs avants (34) attribués à la station de déchargement (5), chacun des dits capteurs répondant à la paire de ramoneurs (17) passant.
  9. Dispositif selon l'une quelconque des revendications 5 à 8, caractérisé en ce que les dispositifs de transport (23) sont formés par une conduite d'air comprimé commandée à soupape (24) reliée à l'extrémité arrière (4) de la conduite de convoyage (2) et une soupape de ventilation (27) et le dispositif de convoyage de retour (28) est formé par une conduite d'air comprimé commandée à soupape (29) reliée à l'extrémité avant (6) de la conduite de convoyage (2) et une soupape de ventilation (32).
  10. Dispositif selon l'une quelconque des revendications 5 à 9, caractérisé en ce que deux conduites de convoyage (2 et 2') parallèles sont attribuées au consommateur (14) et en ce qu'un dispositif de commande est prévu, au moyen duquel des paquets de quantités de vernis (22 et 22') sont transportés de manier décalée l'un par rapport à l'autre à travers les deux conduites de convoyage (2, 2').
  11. Dispositif selon l'une quelconque des revendications 8 à 10, caractérisé en ce qu'un dispositif de dosage (13) pour un déchargement contrôlé du vernis est installé dans la conduite de déchargement (11) qui relie la conduite de convoyage (2) avec le consommateur (14).
EP01127818A 2000-11-28 2001-11-22 Procédé et dispositif de transfert de peintures électroconductrices entre des emplacements à potentiels différents Expired - Lifetime EP1208915B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10059041 2000-11-28
DE10059041A DE10059041C2 (de) 2000-11-28 2000-11-28 Verfahren und Vorrichtung zum Fördern von elektrisch leitfähigen Lacken zwischen unterschiedlichen Spannungspotenzialen

Publications (3)

Publication Number Publication Date
EP1208915A2 EP1208915A2 (fr) 2002-05-29
EP1208915A3 EP1208915A3 (fr) 2004-01-02
EP1208915B1 true EP1208915B1 (fr) 2010-03-24

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EP01127818A Expired - Lifetime EP1208915B1 (fr) 2000-11-28 2001-11-22 Procédé et dispositif de transfert de peintures électroconductrices entre des emplacements à potentiels différents

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Country Link
US (1) US6589348B2 (fr)
EP (1) EP1208915B1 (fr)
AT (1) ATE461750T1 (fr)
DE (2) DE10059041C2 (fr)

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Also Published As

Publication number Publication date
EP1208915A2 (fr) 2002-05-29
ATE461750T1 (de) 2010-04-15
US6589348B2 (en) 2003-07-08
DE50115402D1 (de) 2010-05-06
DE10059041C2 (de) 2002-11-14
EP1208915A3 (fr) 2004-01-02
US20020064601A1 (en) 2002-05-30
DE10059041A1 (de) 2002-06-06

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