EP1252936B1 - Cylindre pour un système de revêtement et méthode d'utilisation - Google Patents

Cylindre pour un système de revêtement et méthode d'utilisation Download PDF

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Publication number
EP1252936B1
EP1252936B1 EP02007051A EP02007051A EP1252936B1 EP 1252936 B1 EP1252936 B1 EP 1252936B1 EP 02007051 A EP02007051 A EP 02007051A EP 02007051 A EP02007051 A EP 02007051A EP 1252936 B1 EP1252936 B1 EP 1252936B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
piston
wall
openings
annular space
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
EP02007051A
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German (de)
English (en)
Other versions
EP1252936A3 (fr
EP1252936A2 (fr
Inventor
Hans-Jürgen Dr. Nolte
Harry Krumma
Frank Herre
Michael Baumann
Stefano Giuliano
Manfred Michelfelder
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.)
Duerr Systems AG
Original Assignee
Duerr Systems AG
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Filing date
Publication date
Application filed by Duerr Systems AG filed Critical Duerr Systems AG
Publication of EP1252936A2 publication Critical patent/EP1252936A2/fr
Publication of EP1252936A3 publication Critical patent/EP1252936A3/fr
Application granted granted Critical
Publication of EP1252936B1 publication Critical patent/EP1252936B1/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
    • B05B5/1675—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive the supply means comprising a piston, e.g. a piston pump
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
    • B05B9/0403—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material
    • B05B9/0413—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material with reciprocating pumps, e.g. membrane pump, piston pump, bellow pump
    • 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 cylinder unit with a piston and a method for dosing a coating medium using such a cylinder unit.
  • the cylinder unit is, in particular, a metering cylinder for ink supply of an atomizer in a coating installation, for example for the optionally electrostatic series coating of vehicle bodies.
  • the coating material can be supplied to the atomizers by metering cylinders whose pistons have hitherto been pushed through the cylinder by a motor and spindle drive (DE 196 10 588 A, EP 0 693 319 A).
  • the piston of a well-known from practice cylinder unit of this type (Dürr / Behr) has at its two ends in each case a voltage applied to the cylinder inner wall lip. Both lips have bent edges towards the side of the cylinder containing the coating material. While one lip seals off the cylinder space containing the coating material as a sealing lip, the lip on the other side of the piston serves as a guide lip for guiding the piston in the cylinder.
  • DE 38 21 006 C discloses a device for dosing and conveying a coating material with a cylinder and a piston, which is arranged on a driven piston rod and rests with spaced seals on the cylinder inner wall.
  • a cleaning fluid is supplied through a fluid channel of the piston rod, passed through a formed between the circumference of the piston and the cylinder inner wall, bounded by the two seals annulus and discharged through a second fluid channel of the piston rod.
  • an insulating cylinder serving for electrical isolation between the grounded paint supply and the high-voltage atomizer of an electrostatic coating installation is known in which two sections of the paint supply line led through the cylinder are selectively connected or disconnected by a piston displaceable by compressed air.
  • the connected to the piston portion of the ink supply line and connected as a drive with the piston compressed air line are each flexible, so that they can follow the piston movement.
  • Dosing cylinders are also known whose pistons are to be driven pneumatically or by a dosing liquid (JP 8-229446 A, EP 0 967 016 A).
  • a dosing liquid JP 8-229446 A, EP 0 967 016 A.
  • a cleaning liquid is filled to clean the cylinder inner wall in the annular space formed between the lips of the piston and the cylinder inner wall.
  • the annulus is above an inner channel of the piston and through the hollow piston rod with a liquid tank. The cleaning fluid should be replaced from time to time when mixing with the paint material conveyed by the piston is detected.
  • the invention has for its object to provide a cylinder unit or a metering of the type considered, which allow a safe and reliable metering operation, even if the piston is driven by a liquid or gaseous pressure medium, wherein by the between the piston lips on Piston circumference formed annular space a rinsing or cleaning medium should be hin micleitbar without the need for a piston rod is required.
  • the docking of the piston at openings in one of the end walls of the cylinder interior wherein the line connections can be made by leak-free automatic fluid couplings.
  • the end wall is selected on the cylinder side containing the coating material (color), since this dosing circuit is rinsed with each color change and therefore the risk of mixing with air is less critical is.
  • the coating material color
  • the automatic coupling and uncoupling of the piston does not require signal-controlled valve functions.
  • this arrangement may be beneficial if the metering system is operated in an electrostatic system. In comparison with openings in the cylindrical inner wall of the cylinder, there is the advantage that the piston does not travel over possibly disturbing opening edges.
  • high-voltage insulation may require that the couplings in the cylinder wall first make a linear movement there before the piston is docked.
  • the alternative possibility of arranging the openings in the cylindrical inner wall may be particularly useful.
  • U. a. requires the piston then no rotation for the connection with the openings.
  • the openings may in this case be arranged, for example, at a location where they communicate with the annular space at the periphery of the piston when the piston is in one of its two end positions. If the end position on the color side of the cylinder is selected, this may be advantageous because of less expensive wiring to the valves connected to the openings.
  • the rinsing or cleaning medium can also flow through the annular space during the piston movement
  • the line connection via movable hoses for example in the form of spiral windings coaxial with the cylinder axis, from the end wall on the pressurized side of the cylinder through its interior connection openings lead the piston and follow the piston movements (on the color side of the cylinder, the hoses could affect its flushability during color change).
  • the piston and its annulus can be flushed in parallel during flushing and filling of the color space of the cylinder.
  • the two piston lips serve not only to guide the piston, but also for sealing, in particular against the mentioned pressure medium.
  • the piston may also have more than two lips and / or other guide members.
  • the rinsing fluid routed through the annular gap of the piston there are also important other advantages. For example, can be carried out by monitoring the pressure of this liquid leak monitoring, since it is concluded from an abnormal pressure drop to a leak of a sealing lip.
  • defects of the piston lips can also be determined by detecting other changes in the rinsing fluid, for example by measuring turbidity, electrical resistance or concentration of the rinsing fluid possibly contaminated by the coating material (eg water-based paint) or hydraulic fluid.
  • the piston When the piston is driven by a dosing liquid, the piston ensures a reliable separation of this medium from the driven medium.
  • the invention is in principle but also for cylinder units with mechanically driven piston.
  • a piston 2 which is located on its opposite sides, except for serving as an inlet or outlet port openings 6, 6 'and 8 closed cylinder chambers 11 and 11' from each other.
  • the generally cylindrical piston 2 has on the circumference of its opposite end faces each one serving both for sealing and for piston guide lip 4 and 4 '. These lips are bent as shown in opposite axial directions, wherein they lie flat against the cylinder inner wall.
  • connection openings 14 and 15 are each connected via a movable hose 16 with a length corresponding to the piston stroke of sufficient length (only one hose is shown), each with a connection opening 18 and 19 in the end wall 20 of the cylinder 1 connected.
  • the channels 12 and 13 and the annular space 10 flows in operation at times prescribed by the parent control program or continuously a rinsing liquid for cleaning the cylinder inner wall.
  • the inner channels 12 and 13 open at axially different points of the annular gap 10, preferably close to its axial ends, so that the liquid circulating through the described piping system flows through the gap-shaped annulus 10 substantially along the cylinder inner wall , But it can also be more than only one channel 12 and 13 between the connection openings 14, 15 and the annular space 10 may be provided.
  • the piston 2 on the drive side so in the cylinder chamber 11 'could also be acted upon by a gaseous medium such as compressed air, wherein a metering pump could be connected to the opening 8.
  • a gaseous medium such as compressed air
  • a modification possibility is to dispense with supply hoses 16 for the annular space 10 within the cylinder 1.
  • the liquid contained in the annular space 310 can be filled or renewed, for example through openings 30, which can lead as bores through the cylindrical cylinder wall into the interior of the cylinder 301, as shown in Fig. 3.
  • valves 34 are opened in external leads for the openings 30 or preferably in the openings 30 themselves or in their vicinity when the piston 302 is in a defined position aligned with the openings 30 located, for example, in one of its end positions, which may be defined by stops 32.
  • the openings 30 may also be provided at any other location of the cylinder 301, and they may also be formed by an annular gap.
  • the two valves 34 of the considered example are suitably arranged so that their valve seat is located in the opening 30 of the cylinder 301 in the vicinity of its inner wall. This results in only small dead spaces in the opening 30, and it is avoided that the piston 302 has to drive with its sealing lips over significant disturbing edges.
  • connection openings 40, 41 which in its one end face and are connected via inner channels with the annular space 410, to be coupled to liquid couplings (not shown) to couple axial ports in the cylinder end wall (for example, at the location of the stops 32 in Fig. 3).
  • liquid couplings not shown
  • axial ports in the cylinder end wall for example, at the location of the stops 32 in Fig. 3.
  • Fig. 4 are the openings 43 in the color side cylinder chamber 411 bounding end wall 45 of the cylinder 401 (the color connectors are not shown here).
  • a rotationally secure centering is provided, e.g. with a centering pin indicated at 47.

Landscapes

  • Details Of Reciprocating Pumps (AREA)
  • Nozzles (AREA)
  • Fertilizers (AREA)
  • Coating Apparatus (AREA)
  • Electrostatic Spraying Apparatus (AREA)

Claims (15)

  1. Unité de cylindre pour une installation de revêtement avec un piston (2) coulissant dans le cylindre (1), qui sépare les espaces (11, 11') se trouvant sur ses côtés opposés du cylindre (1) les uns des autres, et s'appuie avec au moins deux lèvres (4, 4') espacées l'une de l'autre dans la direction d'axe du cylindre de façon étanche à la paroi interne du cylindre (11), au moins la lèvre (4) tournée vers un espace de cylindre (11) étant réalisée comme lèvre d'étanchéité pour l'étanchéité résistante à la pression vis-à-vis d'un fluide se trouvant dans cet espace (11), et les lèvres (4, 4') délimitant l'espace annulaire (10, 310, 410) formé entre le pourtour du piston (2, 302, 402) et la paroi interne du cylindre (1, 301, 401) pour un agent pouvant être utilisé pour le lavage ou le nettoyage de la paroi interne ou du cylindre,
    caractérisée en ce que dans une paroi du cylindre (1 ; 301; 401) se trouvent des ouvertures (30, 43 ; 18, 19), qui sont reliées à un agencement de conduite pour l'agent de lavage ou de nettoyage circulant dedans, et qui sont en liaison avec l'espace annulaire (310, 410) lorsque le piston (302, 402) se trouve dans une position définie alignée avec les ouvertures (30, 43), ou sont reliés à l'espace annulaire (10) au moyen d'un flexible (16) mobile, qui aboutissent par l'un des espaces de cylindre (11') à des ouvertures de branchement (14, 15, 12, 13) du piston (2).
  2. Unité de cylindre selon la revendication 1, caractérisée en ce que les ouvertures (43) se trouvent dans l'une des parois avant (45) du cylindre (401), qui délimite l'un des espaces de cylindre (411), et en ce que le piston (402) contient dans sa face avant tournée vers la paroi avant (45) du cylindre (401) des ouvertures de branchement (40, 41) qui sont reliées par des canaux intérieurs du piston (402) à l'espace annulaire (310, 410) et sont alignées avec les ouvertures (43) du cylindre (401) lorsque le piston se trouve dans la position définie.
  3. Unité de cylindre selon la revendication 2, caractérisée en ce que les ouvertures (43) se trouvent dans la paroi avant (45) du cylindre qui délimitent l'espace de cylindre (411), lequel contient le matériau de revêtement à transporter par le piston (402).
  4. Unité de cylindre selon la revendication 2 ou 3, caractérisée en ce que les ouvertures (40, 41, 43) du cylindre (401) et du piston (402) contiennent des accouplements de liquide, qui ferment les canaux raccordés pendant les déplacements du piston et ouvrent la course de liquide vers l'espace annulaire (410) du piston lorsque le piston (402) est dans sa position définie.
  5. Unité de cylindre selon la revendication 1, caractérisée en ce que les ouvertures (30) se trouvent dans la paroi intérieure cylindrique du cylindre (301) et le dispositif de conduite raccordé contient un agencement de vanne (34) commandé.
  6. Unité de cylindre selon la revendication 5, caractérisée en ce que des vannes (34) commandées pour l'agent de lavage ou de nettoyage sont disposées dans les ouvertures (30) dans la paroi de cylindre ou dans leur voisinage.
  7. Unité de cylindre selon l'une quelconque des revendications précédentes, caractérisée en ce que les deux lèvres (4, 4') sont conçues comme lèvre d'étanchéité pour l'étanchéité résistante à la pression vis-à-vis de l'espace de cylindre (11, 11') qui leur est attribué respectivement.
  8. Unité de cylindre selon la revendication 7, caractérisée en ce que les deux lèvres (4, 4') sont pliées dans les directions opposées entre elles en direction du premier espace de cylindre (11) ou du second espace de cylindre (11') ou présentent des arêtes d'extrémité pliées dans ces directions.
  9. Unité de cylindre selon la revendication 8, caractérisée en ce que les deux lèvres (4, 4') pliées axialement ou arêtes d'extrémité s'appuient à plat sur la paroi intérieure du cylindre (1).
  10. Unité de cylindre selon l'une quelconque des revendications 1 à 9, caractérisée en ce qu'un liquide de dosage, avec lequel du matériau de revêtement se trouvant sur l'autre côté est sorti par pression d'une évacuation (8) du cylindre (1), est guidé dans l'espace (11') sur l'un des côtés du piston (2).
  11. Unité de cylindre selon l'une quelconque des revendications précédentes, caractérisée en ce qu'un dispositif capteur est prévu pour le contrôle de la pression et/ou au moins d'une autre caractéristique de l'agent de lavage ou de nettoyage.
  12. Procédé pour le dosage d'un agent de revêtement, qui est amené à un organe d'application dans une installation de revêtement à partir d'une unité de cylindre, à travers le cylindre (1 ; 301 ; 401) de laquelle un piston (2 ; 302 ; 402) s'appliquant avec au moins deux lèvres (4, 4') espacées axialement sur la paroi interne du cylindre est glissé, afin de faire sortir du cylindre (1 ; 301 ; 401) le matériau de revêtement se trouvant sur l'un de ses côtés,
    un agent de lavage ou de nettoyage servant au nettoyage de la paroi interne du cylindre pendant le déplacement du piston (302, 402) étant guidé à travers l'espace annulaire (10 ; 310, 410) formé entre le pourtour du piston et la paroi intérieure du cylindre (1 ; 301 ; 401) et délimité par les deux lèvres (4, 4'),
    caractérisé en ce que le piston (302, 402) est déplacé dans une position définie, dans laquelle son espace annulaire (310, 410) est aligné avec des ouvertures (30, 43) dans la paroi du cylindre, et l'agent de nettoyage est guidé ensuite pour le lavage de l'espace annulaire (310, 410) à travers celui-ci, ou bien l'agent de lavage ou de nettoyage est guidé par des flexibles (16) mobiles, qui partent d'ouvertures (18, 19) pratiquées dans une paroi (20) du cylindre (1), traversent l'intérieur (11') du cylindre (1) et aboutissent à un canal (14, 15, 12, 13) intérieur du piston (2), dans l'espace annulaire (10) et à la sortie de celui-ci.
  13. Procédé selon la revendication 12, caractérisé en ce que, pour le contrôle de fonction de l'unité de cylindre, la pression et/ou au moins une autre caractéristique du liquide dirigé dans l'espace annulaire (10) sont mesurées.
  14. Procédé selon la revendication 12 ou 13, caractérisé en ce que le liquide circule à travers l'espace annulaire (10) à des intervalles prédéfinis, choisis automatiquement par une commande de programme de l'installation de revêtement.
  15. Procédé selon la revendication 12 ou 13, caractérisée en ce que le liquide circule pendant le déplacement du piston de façon continue à travers l'espace annulaire (10).
EP02007051A 2001-03-29 2002-03-27 Cylindre pour un système de revêtement et méthode d'utilisation Expired - Lifetime EP1252936B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10115465A DE10115465A1 (de) 2001-03-29 2001-03-29 Zylindereinheit für eine Beschichtungsanlage und Dosierverfahren unter Verwendung dieser Einheit
DE10115465 2001-03-29

Publications (3)

Publication Number Publication Date
EP1252936A2 EP1252936A2 (fr) 2002-10-30
EP1252936A3 EP1252936A3 (fr) 2004-09-22
EP1252936B1 true EP1252936B1 (fr) 2007-01-03

Family

ID=7679493

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02007051A Expired - Lifetime EP1252936B1 (fr) 2001-03-29 2002-03-27 Cylindre pour un système de revêtement et méthode d'utilisation

Country Status (4)

Country Link
EP (1) EP1252936B1 (fr)
AT (1) ATE350172T1 (fr)
DE (2) DE10115465A1 (fr)
ES (1) ES2278827T3 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4841342B2 (ja) * 2006-07-14 2011-12-21 トリニティ工業株式会社 塗料漏れ検知装置、塗料充填システム
DE102008046246B4 (de) * 2008-09-08 2011-05-19 Dräger, Karl-Heinz Vorrichtung und Verfahren zum Verteilen von Reiz- oder Kampfstoffen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3821006C1 (fr) * 1988-06-22 1989-07-13 Ransburg-Gema Gmbh, 6056 Heusenstamm, De
FR2656460B1 (fr) * 1989-12-22 1994-02-11 Sames Sa Dispositif d'isolation electrique formant element de conduit et installation comportant un tel dispositif.
US5255856A (en) * 1990-11-08 1993-10-26 Honda Giken Kogyo Kaubshiki Kiasha Electrostatic spray painting apparatus
WO1993023173A1 (fr) * 1992-05-15 1993-11-25 Abb Trallfa Robot A/S Dispositif de dosage de peinture pour systeme de peinture par pulverisation commande par programme

Also Published As

Publication number Publication date
DE50209123D1 (de) 2007-02-15
DE10115465A1 (de) 2002-10-10
ES2278827T3 (es) 2007-08-16
EP1252936A3 (fr) 2004-09-22
ATE350172T1 (de) 2007-01-15
EP1252936A2 (fr) 2002-10-30

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