EP1284162B1 - Verfahren und Vorrichtung zum Reinigen einer Lack-Förderleitung in einer Lackiereinrichtung - Google Patents

Verfahren und Vorrichtung zum Reinigen einer Lack-Förderleitung in einer Lackiereinrichtung Download PDF

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Publication number
EP1284162B1
EP1284162B1 EP02016688A EP02016688A EP1284162B1 EP 1284162 B1 EP1284162 B1 EP 1284162B1 EP 02016688 A EP02016688 A EP 02016688A EP 02016688 A EP02016688 A EP 02016688A EP 1284162 B1 EP1284162 B1 EP 1284162B1
Authority
EP
European Patent Office
Prior art keywords
conveying line
paint
inert gas
valve
cleansing agent
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
EP02016688A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1284162A1 (de
Inventor
Thomas Bahr
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.)
Carlisle Fluid Technologies Germany GmbH
Original Assignee
ITW Oberflaechentechnik 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 ITW Oberflaechentechnik GmbH filed Critical ITW Oberflaechentechnik GmbH
Publication of EP1284162A1 publication Critical patent/EP1284162A1/de
Application granted granted Critical
Publication of EP1284162B1 publication Critical patent/EP1284162B1/de
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
    • 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
    • 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
    • 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

Definitions

  • the invention relates to a method according to the preamble of claim 1 and a Device according to the preamble of claim 8.
  • a method and apparatus of this kind are known from US-A-5863352. She discloses a method and apparatus having a paint feed path through which each one of several color reservoir coating color a coating robot can be fed. When changing from one color to another color, the ink feed path becomes cleaned of paint residues of the first color by the following steps: rinsing and Blowing out the first color by gas, z. Nitrogen or air; Rinsing with thinner; Rinsing and blowing out residues of the diluent again with gas, z. B. nitrogen or Air; rinse again with thinner; rinsing again and purging with gas; Feed the new paint for the next spray coating operation.
  • a device for a similar process also shows the US-A-5330101.
  • the invention is based on the technical problem that Process and the device of the type indicated initially in such a way that during the cleaning steps lower amounts of paint and cleaning agents to be disposed of arise and the risk of lump formation from paint residues largely is avoided.
  • the invention has the significant advantage that because of the application of a Inert gases instead of compressed air there is no longer a risk that liquid paint residues be converted into solid clumps during the purification phases. Thereby can the cleaning phases overall designed simpler and with smaller amounts Cleaning agents are performed. Finally, by the invention a Significant reduction in the amount of paint and cleaning agents to be disposed of thereby contributing to the reduction of environmental impact.
  • the enclosed drawing first shows a conventional paint or lacquer change and metering device of e.g. for painting body parts suitable painting.
  • a delivery line 1 for paint is used at a first end 1a for connection to a paint reservoir 2 and is at a second end 1b with a coating device 3 fluidly connected.
  • the applicator 3 includes an applicator 4, the e.g. from a spray gun, an atomizer or any other known per se An element for spraying, spraying or otherwise applying lacquer in a jet 5 may exist. All other, for the invention unimportant parts of the applicator 3 have been omitted for the sake of simplicity.
  • the reservoir 2 is preferably by means of a loop, which has a flow 6 and a return 7, to a known color or lacquer change unit. 8 connected. With this is preferably at least one except the reservoir 2 another reservoir 9 connected, for which purpose another, also a Flow 10 and a return 11 having ring line is provided.
  • both Ring lines is each a controllable valve 12 and 14 connected, the corresponding Flow 6, 10 either with the associated return 7, 11 or at one connection point 15, 16 with the first end 1a of the delivery line 1 connects.
  • the lead 6, 10 connected to the associated return line 7, 11 circulates in the relevant reservoir 2, 9, liquid paint having a preselected pressure (e.g., about 4 bar) in the relevant ring line.
  • a preselected pressure e.g., about 4 bar
  • the reservoirs 2 and 9 are e.g. as a pressure vessel or as a membrane or Piston pumps provided container formed from which, as it is in painting the type described is common, the paint pumped into the ring line 6, 7 and 10, 11 becomes. Subsequently, the storage containers 2, 9 are therefore generally referred to as "paint supplies" designated.
  • a dosing unit 17 For accurate metering of the paint, e.g. a dosing unit 17.
  • a paint pressure regulator 18 and a e.g. as motor driven Gear pump trained metering pump 19, both in series into the delivery line 1 are switched.
  • the pressure in front of the metering pump 19 can by means of a pressure sensor 20, while measuring the pressure with which the paint the Applicator 3 is supplied, another, in the flow direction behind the metering pump 19 arranged pressure sensor 21 is used.
  • a parallel to the metering pump 19 extending Beipattytechnisch 22 may be connected in the delivery line 1 to use certain Lacks a variety of paint instead of the slow-running metering pump 19 by to let the bypass line 22 run.
  • the device described has one with an inert gas, preferably Nitrogen-operating flushing unit 23 for cleaning the feed line 1 on.
  • the Rinsing unit 23 is by means of a line 24 either directly or via a not shown Valve of the applicator 3 is connected to the second end 1 b of the conveying line 1, that in a position of this valve through the feed line 1 supplied paint in the form of the beam 5 flows out of the applicator 3, while in another Position of the valve, the line 24 fluidly connected to the feed line 1 is.
  • the applicator 4 has a free to the lines 1, 24th connected passage to which a spray nozzle or the same is connected. This is, if not painted, sealed with a needle, which is for a painting process is pulled out of the nozzle to release the beam 5.
  • the rinsing unit 23 has an inert gas source 28 and a cleaning fluid source 29.
  • the inert gas source 28 consists for example of a conventional nitrogen cylinder, from which when opening a valve gaseous nitrogen is forced into a conduit 30 which is connected via a terminal 31 to the conduit 24.
  • the cleaning fluid source 29 for example, from a reservoir from which a cleaning fluid can be pressed under pressure into a conduit 32 which is connected via a terminal 33 to the conduit 24.
  • a pressure regulator 34 in line 30 in the flow direction of the inert gas (arrow v ) one behind the other, a pressure regulator 34, a pressure sensor 35, for example, designed as a two-way valve, controllable valve 36 and a check valve 37 connected to the reverse flow of unwanted media in the arrow v opposite direction prevented.
  • the components 34 to 37 not only form a means for connecting the inert gas source 28 to the delivery line 1, but at the same time also a means for filling the delivery line 1 with inert gas, as explained in more detail below.
  • a pressure regulator 38, a pressure sensor 39, a check valve 40 and a controllable valve 41 are connected in line 32 in the flow direction of the cleaning liquid (arrow w ) in succession, by means of which the cleaning liquid can be introduced at the terminal 33 in the line 24.
  • the check valve 40 also prevents unwanted backflow.
  • the components 30 to 41 as explained below, also form a means for forming a foam mixture.
  • the cleaning fluid source 29, like the reservoir 2, 9 a pressure vessel or contain a container with a pump system.
  • the desired pressure can then be adjusted with the pressure regulator 38 and monitored with the pressure sensor 39.
  • the first end 1a of the delivery line 1 opens according to the accompanying drawing via a controllable discharge valve 42 into a collecting container 43.
  • the arrangement is preferably made so that the connection points 15 and 16, viewed from the discharge valve 42, in the flow direction (arrow x ) behind this lie and the shortest possible line sections 44, 45 are connected to the valves 12, 14.
  • In the flow direction immediately behind the last connection point 15 is also a od in the manner of a proximity switch.
  • inductive or capacitive sensor 46 is arranged, whose function is explained below.
  • Rinsing unit 23 The operation of the described painting and the invention Rinsing unit 23 is essentially as follows.
  • valves 12, 14, 36, 41 and 42 are first closed. By opening one of the valves 12, 14 it is then selected which Paint is to be delivered by the applicator 3 during the working phase.
  • the Valve 22 is open or closed depending on the paint used. In the assumption that that Valve 12 is opened, thus flows liquid paint from the reservoir 2 in through set the pressure regulator 18 and the metering pump 19 and by means of the pressure sensors 20, 21 monitored dosage to the applicator 3, so that this by automatic or manually opening and closing its outlet nozzle in the usual manner can be. This mode of operation remains unchanged as long as the paint from the reservoir 2 is processed.
  • a cleaning phase for the delivery line 1 is initially provided.
  • the valve 36 of the purging unit 23 is opened when the applicator 3 is closed, whereby the inert gas from the inert gas source 28 via the lines 30 and 24 and the applicator 3 or directly into the second end 1b of the delivery line 1 passes.
  • the pressure of the inert gas readable at the sensor 35 is determined by the setting of the pressure regulator 34.
  • the pressure of the inert gas (eg 10 bar) is chosen so that the standing in the delivery line 1 paint opposite to the usual conveying direction (arrow x ) is pushed back in the direction of the reservoir 2 and its ring line. Because of the short line piece 44, the return transport of the paint can be almost complete.
  • the sensor 46 monitors this process and outputs a signal as soon as it is received by the Interface between paint and inert gas is passed.
  • This signal can not be over shown, preferably automatic control device can be used to Close valve 12 and the drain valve 42 to open. This has the consequence that the very small amount of paint still standing in front of the inert gas column now through the end 1a of the Delivery line 1 is pressed into the collecting container 43. It is therefore only one here small amount of paint to be disposed of.
  • the element 4 of the applicator 3 can also be used for a short time opened and thereby be freed from paint.
  • the flushing unit 23 operates in the manner of a high-pressure cleaner and thus extremely effective and fast.
  • the foam mixture, depending on the paint used be set differently, so that it is always possible to achieve optimal flushing.
  • the cleaning phase can also have a preset expiry time from the beginning of the detergent supply or from the time the detergent is activated Sensors 46 are terminated.
  • the cleaning phase can also have a preset expiry time from the beginning of the detergent supply or from the time the detergent is activated Sensors 46 are terminated.
  • the entire delivery line 1 is filled exclusively with inert gas, whereupon the valve 42 is closed and this state is maintained until the next one Work phase begins and, for example the valve 14 instead of the valve 12 is opened and the valve 36 is closed.
  • This will ensure that the inert gas over time between the end of the actual cleaning process and the beginning of the next one Working phase with such a high pressure in the delivery line 1 is that the penetration from air or oxygen through uncontrollable leaks with certainty is avoided.
  • the valve 36 is closed, whereby the delivery line 1 is closed on all sides.
  • the prevailing in the delivery line 1 pressure is continuously using the Pressure sensors 20, 21 controlled. Is a component leaking or does any medium flow from the outside uncontrolled in the delivery line 1, then this is with the help of Pressure sensors 20, 21 detected and for generating an alarm signal, a shutdown signal used for the entire facility or the same.
  • the valve 22 is here preferably opened.
  • the element 4 of Applicator 3 are opened again. This forces the newly added paint first, the inert gas column standing in the delivery line 1 out of this.
  • the the Influx of the lacquer signaling sensor 46 can be used to a to determine from the length of the delivery line 1 resulting lead time before with the actual painting work is started when the spraying of the inert gas on the workpiece to be painted should be avoided.
  • the element 4 acts immediately after the Release of the paint through the valve 14 directed to the relevant workpiece surface and thus first some inert gas on the workpiece surface to be painted arrives.
  • the delivery line 1 in the same way as described above in connection with the inert gas with Help the located in the delivery line 1 paint pressure checked for any errors become.
  • the relevant valve 12, 14th closed located at this time in the delivery line 1 paint pressure as Specified target pressure and this means of the pressure sensors 20, 21 monitored. at unwanted increase or decrease of this pressure is with the help of automatic Control device in turn generates an alarm or shutdown signal or the like.
  • the valve 22 is preferably open. Should be repainted afterwards, the relevant valve 12, 14 is opened again and the valve 22 is closed again.
  • the inert gas in the inert gas source 28 is in particular when it is in the Inert gas is nitrogen, preferably at a certain minimum temperature held, e.g. is equal to or greater than 10 ° C or 20 ° C. This will ensure that the paints used are not limited to temperatures below e.g. 5 ° C cooled where some paints can be destroyed.
  • the paint pressure in the ring lines 6, 7th or 10, 11 may be appropriate, to choose larger (for example, 15 to 20 bar).
  • the valves 12, 14 preferably further valves or the like upstream, during the cleaning phases reduce the pressure in the ring lines 6, 7 or 10, 11 to a value or downset sufficiently smaller than the pressure of the inert gas (e.g., 10 bar) is to achieve the desired recovery of the paint during the cleaning phases guarantee.
  • the inert gas e.g. 10 bar
  • the invention brings numerous advantages. First, by the application an inert gas which does not react with the types of lacquer used and the final one Filling the delivery line 1 with the inert gas ensured that in the delivery line. 1 remaining paint residues do not od in disturbing lumps. Like. Are transformed. this applies for the entire duration of a cleaning phase between two working phases. This can also be avoided that at the beginning of a working phase for safety's sake once a certain, exiting the applicator 3 paint amount in one Container must be initiated to apply the detergent to the Safely avoid workpiece surface, i. when applying the invention, the newly emerging paint can be processed immediately and without waste.
  • the invention is not limited to the described embodiment that can be modified in many ways. This applies in particular to the number of different types of paint provided in the individual case, which can be selected with the aid of the color change unit 8. Instead of paints of different colors, it is also possible to select varnishes or varnishes with other different properties, for example conventional varnishes in addition to varnishes for so-called metallic coatings. It is clear that instead of paints and other liquids, especially colors can be transported through the conveyor line 1 and the term "paint" in the context of the present invention, all such, suitable for coatings liquids. Furthermore, the various steps during the cleaning phases may be performed in a different order and / or in a different direction and / or with different timings.
  • the delivery line 1 may contain other functional components, such as a micro-filter, which passes only particles to a size that is little larger than the pigment size of the paints used.
  • valves 12, 14 of the color changing unit 8 can be combined together with the discharge valve 42 into a compact block, thereby further shortening the line sections 44, 45 or omitted entirely.
  • the invention is intended to include not only the described apparatus for cleaning a paint delivery line 1, but also a complete, equipped with such a device painting.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Spray Control Apparatus (AREA)
  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Coating Apparatus (AREA)
  • Cleaning In General (AREA)
  • Nozzles (AREA)
EP02016688A 2001-08-17 2002-07-26 Verfahren und Vorrichtung zum Reinigen einer Lack-Förderleitung in einer Lackiereinrichtung Expired - Lifetime EP1284162B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10140216A DE10140216B4 (de) 2001-08-17 2001-08-17 Verfahren und Vorrichtung an einer Lackiereinrichtung zum Reinigen einer Lack-Förderleitung
DE10140216 2001-08-17

Publications (2)

Publication Number Publication Date
EP1284162A1 EP1284162A1 (de) 2003-02-19
EP1284162B1 true EP1284162B1 (de) 2005-10-26

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EP02016688A Expired - Lifetime EP1284162B1 (de) 2001-08-17 2002-07-26 Verfahren und Vorrichtung zum Reinigen einer Lack-Förderleitung in einer Lackiereinrichtung

Country Status (9)

Country Link
US (2) US7066186B2 (zh)
EP (1) EP1284162B1 (zh)
JP (1) JP3828468B2 (zh)
CN (1) CN1238115C (zh)
AT (1) ATE307679T1 (zh)
CA (1) CA2398121A1 (zh)
DE (3) DE10140216B4 (zh)
ES (1) ES2250554T3 (zh)
MX (1) MXPA02007943A (zh)

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ATE307679T1 (de) 2005-11-15
DE10140216B4 (de) 2006-02-09
ES2250554T3 (es) 2006-04-16
EP1284162A1 (de) 2003-02-19
US20030041884A1 (en) 2003-03-06
DE20118531U1 (de) 2003-01-16
US7066186B2 (en) 2006-06-27
CA2398121A1 (en) 2003-02-17
DE10140216A1 (de) 2003-03-06
CN1406677A (zh) 2003-04-02
CN1238115C (zh) 2006-01-25
JP3828468B2 (ja) 2006-10-04
DE50204660D1 (de) 2005-12-01
US7117877B2 (en) 2006-10-10
JP2003136030A (ja) 2003-05-13
US20050139237A1 (en) 2005-06-30
MXPA02007943A (es) 2005-09-08

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