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WO2025093080A2 - Installation de traitement pour le traitement de pièces et procédé de traitement de pièces - Google Patents

Installation de traitement pour le traitement de pièces et procédé de traitement de pièces Download PDF

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Publication number
WO2025093080A2
WO2025093080A2 PCT/DE2024/100907 DE2024100907W WO2025093080A2 WO 2025093080 A2 WO2025093080 A2 WO 2025093080A2 DE 2024100907 W DE2024100907 W DE 2024100907W WO 2025093080 A2 WO2025093080 A2 WO 2025093080A2
Authority
WO
WIPO (PCT)
Prior art keywords
treatment
tank
rinsing
immersion
workpieces
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.)
Pending
Application number
PCT/DE2024/100907
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German (de)
English (en)
Other versions
WO2025093080A3 (fr
Inventor
Oliver SEYBOTH
Marek DOWNAR
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
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 Duerr Systems AG filed Critical Duerr Systems AG
Publication of WO2025093080A2 publication Critical patent/WO2025093080A2/fr
Publication of WO2025093080A3 publication Critical patent/WO2025093080A3/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/22—Servicing or operating apparatus or multistep processes
    • C25D13/24—Regeneration of process liquids
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/04—Electrophoretic coating characterised by the process with organic material

Definitions

  • Treatment system for treating workpieces and method for treating workpieces
  • the present invention relates to a treatment system for treating workpieces, in particular for coating, for example, dip-painting, vehicle bodies.
  • the present invention further relates to a corresponding method for treating workpieces.
  • treatment systems for the treatment of workpieces in particular coating systems for the electrocoating of vehicle bodies, comprise a treatment zone with a dip tank, in particular a paint dip tank, and rinsing zones adjoining it in a main conveying direction, each with a rinsing tank, wherein each body passes through each zone, i.e. also each of the tanks, along the main conveying direction.
  • the rinsing basins can be either spray-rinsing or immersion-rinsing. Often, a spray-rinsing basin is provided in the first rinsing zone – adjacent to the treatment zone with the paint dip tank – and an immersion-rinsing basin is provided in the second zone.
  • Dip tanks typically have an overflow area separated by a weir with a slightly lower fluid level or bath level. This allows both the fluid level in the tank to be regulated and foam and other contaminants floating on the bath surface to be removed.
  • the lower bath level is achieved and maintained by continuously removing treatment fluid or dip paint/varnish from the overflow area of the tank via one or more circulation circuits and feeding it into the tank, i.e., the actual main volume.
  • a so-called ultrafiltrate from the dip coating is used as the rinsing fluid or rinsing medium.
  • a portion of the treatment fluid is removed from the dip coating tank, treated by filtration, and then fed to the last rinsing zone, i.e., the zone furthest from the dip coating tank in the main conveying direction.
  • the ultrafiltrate is conveyed in a cascade from rinsing zone to rinsing zone, counter to the main conveying direction, and finally returned to the dip coating tank.
  • the flow from one basin in one zone to another in the adjacent zone opposite the main flow direction is achieved, for example, via a free overflow.
  • the flow of ultrafiltrate from one basin to the next can also be achieved via a pump, which preferably conveys the filtrate to a plurality of spray nozzles in the target basin, which are used to rinse car bodies emerging from the target basin or just emerging from the target basin.
  • a further rinsing zone operated with demineralized water can be provided.
  • a nanofiltrate produced from the previously produced ultrafiltrate can be used instead of the demineralized water.
  • the treatment fluid or paint must be continuously circulated in the dip tank to prevent separation. Furthermore, for a coating process such as electrocoating, it is advantageous if a certain flow prevails in the dip tank, which transports heat away from the surface of the car body being treated, delivers fresh treatment fluid to the surface of the car body being treated, and removes any gas bubbles that form on the surface of the car body being treated.
  • ultrafiltrate must be continuously generated for the rinsing zones, so three separate fluid circuits are typically provided.
  • Each of these three circuits in a dip tank preferably has its own pumping device or pump, by means of which treatment fluid or paint is pumped out of the dip tank and finally returned to the dip tank.
  • a cooling circuit is provided as one of three circulation circuits, in which the treatment fluid is passed through a heat exchanger and cooled to the desired temperature.
  • the circulation volume of the cooling circuit is approximately 30% to 40% of the total required circulation volume of the circuits.
  • an ultrafiltrate circuit is provided as an additional circulation circuit, in which the treatment fluid or paint used to produce the ultrafiltrate is removed from the immersion tank and passed through filter modules, preferably with ultrafiltration membranes.
  • the circulation rate of the ultrafiltrate circuit is 20% to 30% of the total circulation rate required by the circuits.
  • a bath flow circuit is provided as a third circulation circuit, through which the remaining amount of approximately 30% to 50% of the required total circulation volume of the circuits is circulated.
  • all three circuits of an immersion tank are equipped with filters or filter modules, which preferably have one or more bag filters, through which the circulated treatment fluid or the circulated paint is filtered.
  • a fixed process duration of, for example, 4 minutes per body is usually specified, with the bodies being moved sequentially and continuously through the dip tank in the main conveying direction.
  • the extension of the dip tank in the main conveying direction i.e., the longitudinal extension of the tank, therefore depends on the body length and the conveying speed, so that the required or specified process duration is just achieved during the passage of the respective body through the dip tank.
  • the conveyor speed is determined by the required workpiece throughput through the system in question. The more car bodies to be treated or produced per unit of time, the higher the conveyor speed and, likewise, the greater the required length of the paint dip tank.
  • the immersion tank has to be completely emptied for maintenance and/or repair work, which requires the system to be temporarily shut down.
  • This also makes optimization measures, such as the iterative adjustment of the nozzle alignment, very complex and expensive.
  • the present invention is therefore based on the object of providing a treatment system for treating workpieces which enables more flexible and cost-effective treatment process adjustments and is easier to maintain.
  • the treatment plant is in particular a treatment plant for treating workpieces.
  • the treatment plant is a plant for coating vehicle bodies, in particular a plant for dip-coating vehicle bodies.
  • the treatment system has a main conveying direction along which the workpieces are conveyed during their treatment.
  • the treatment system further comprises the following: at least one treatment zone with at least one treatment tank, in particular at least one dip tank, for treating the workpieces with at least one treatment fluid, in particular dip-coating the workpieces with at least one paint; and at least one rinsing zone with at least one rinsing tank for rinsing the treated workpieces with a filtrate of the at least one treatment fluid, in particular an ultrafiltrate of the at least one treatment fluid.
  • the at least one rinsing zone is arranged in the main conveying direction after the at least one treatment zone.
  • the at least one treatment basin of the treatment zone is fluidically connected to at least one cooling circuit for cooling at least a portion of the treatment fluid and/or at least one filtrate circuit, in particular at least one ultrafiltrate circuit, for producing the filtrate, in particular the ultrafiltrate, from which at least one treatment fluid and rinsing the treated workpieces with the filtrate, in particular the ultrafiltrate.
  • a treatment plant comprises up to three immersion tanks into which the workpieces to be treated, in particular vehicle bodies, are introduced and removed from a main conveyor line alternatively, i.e. into only one of the immersion tanks at a time. All workpieces treated in one of the immersion tanks then pass through the rinsing zone, which preferably has several consecutive rinsing tanks, wherein the workpieces in the rinsing zone are rinsed with a filtrate which is generated from the treatment fluid of all the immersion tanks.
  • the immersion tanks in operation are preferably aligned parallel to one another and arranged on one side of the main conveyor line, whereby the immersion tanks are easier to maintain, retrofit and/or replace.
  • the provision of several immersion tanks not only increases the throughput of workpieces to be treated, but also allows for more flexible response to different workpieces or treatment parameters. It may be advantageous if the at least one treatment basin of the treatment zone is further fluidically connected to at least one circulation circuit for circulating at least part of the treatment fluid.
  • the at least one treatment tank can advantageously be fluidly connected to three circuits, namely the cooling circuit, the filtrate circuit and the circulation circuit.
  • the at least one treatment tank is only connected to the cooling circuit and the filtrate circuit, these should preferably be dimensioned larger in order to be able to at least approximately take over the function of the circulation circuit.
  • the immersion tanks can be coupled fluidically or fluidically, so that a continuous mixing of the treatment fluid, in particular of the paint, takes place in order to obtain an approximately identical quality of the treatment fluid in the immersion tanks.
  • each immersion tank can alternatively be operated individually, particularly without mixing the treatment fluid with fluid from the other immersion tanks. This also means that each immersion tank can be shut down and/or emptied individually or separately, without affecting the treatment process in the other immersion tanks.
  • the treatment system according to the invention is preferably modularly expandable, i.e., additional immersion tanks can be easily added.
  • the treatment system comprises a main conveyor line with a main conveying direction, adjacent to which the treatment zone and the rinsing zone are located.
  • the workpieces are conveyed into and out of the zones by the main conveyor line, thus overcoming the disadvantages of a linear arrangement of the tanks.
  • the treatment tank comprises an overflow area for regulating a level of the treatment fluid in a main volume of the treatment tank.
  • the amount of treatment fluid contained in the main volume of the treatment tank is also called the fluid bath and the level of the treatment fluid to be regulated is accordingly the fluid bath level.
  • the sink is a spray sink or a plunge sink.
  • the rinsing zone comprises a spray rinsing basin and a dip rinsing basin.
  • each circuit may comprise at least one pump device and at least one filter device.
  • the at least one cooling circuit comprises at least one heat transfer device for cooling the treatment fluid.
  • the at least one rinsing basin is integrated into the at least one filtrate circuit.
  • the workpieces in the rinsing tanks are rinsed with the filtrate produced in the filtrate circuit.
  • the at least one filtrate circuit comprises a collecting tank upstream of the at least one rinsing basin.
  • the filtrate produced from the treatment fluid of these tanks is collected in the common collecting tank and then passed on to the rinsing zone.
  • the treatment plant comprises at least one spray rinsing tank and at least one immersion rinsing tank, wherein the spray rinsing tank is arranged between the treatment tank and the immersion rinsing tank with respect to the main conveying direction.
  • the filtrate can be conveyed in a cascade from sink to sink, opposite to the main conveying direction, with the filtrate being conveyed indirectly to each sink.
  • the treatment plant comprises at least two, preferably three, dipping tanks arranged parallel to one another, wherein a longitudinal extent of the dipping tanks is aligned transversely to the main conveying direction, and wherein the workpieces can be conveyed into the dipping tanks transversely to the main conveying direction and/or out of the dipping tanks transversely to the main conveying direction.
  • the filtrate circuit of each immersion tank has a shut-off valve upstream of the collecting tank.
  • treatment fluids carried in the circulation circuits of the immersion tanks can be mixed in a common mixing pipe with at least one pipe section.
  • a bypass line is provided in each of the circulation circuits of the immersion tanks.
  • Bypass lines can be used to avoid the mixing of the treatment fluids in the circulation circuits, which may be necessary, for example, if mixing of the treatment fluids is not permitted for quality reasons.
  • the object of the invention can further be achieved by a method for treating workpieces having the features according to claim 14.
  • the process is in particular a process for coating, for example dip painting, vehicle bodies.
  • the procedure includes the following steps:
  • each workpiece is preferably treated in only one of the possible immersion tanks of the treatment zone with the treatment fluid of the corresponding immersion tank and then rinsed in each of the spray rinse tanks and each of the immersion rinse tanks of the rinsing zone.
  • a portion of the treatment fluid in each immersion tank is cooled in a separate cooling circuit by means of a heat transfer device.
  • ultrafiltrate is produced from a further part of the treatment fluid of each immersion tank for the rinsing processes, which is returned in an ultrafiltrate circuit from a common collecting tank in a cascade manner from the immersion rinsing tank via the spray rinsing tank to the at least one immersion tank, preferably three immersion tanks.
  • each immersion tank may also be advantageous if a further part of the treatment fluid of each immersion tank is fed into a separate circulation circuit to generate flow and mix.
  • the circulation circuits are operated in a bypass mode for circulating the treatment fluid of the respective immersion tank and/or in a mixed mode for mixing the treatment fluids conducted in the circulation circuits in a common mixing pipe with at least one pipe section
  • the method preferably has one or more of the features and/or advantages described in connection with the treatment plant.
  • the treatment plant preferably has one or more of the features and/or advantages described in connection with the method.
  • Fig. 1 is a schematic representation of a first embodiment of a treatment plant according to the invention
  • Fig. 2 is a schematic representation of a filtrate circuit of a second embodiment of a treatment plant according to the invention with three immersion tanks;
  • Fig. 3 is a schematic representation of two circulation circuits of a third embodiment of a treatment plant according to the invention with two immersion tanks;
  • Fig. 4 is a schematic representation of three circulation circuits of the second embodiment of a treatment plant according to the invention with three immersion tanks;
  • Fig. 5 is a schematic representation of the complete second embodiment of a treatment plant according to the invention with three immersion tanks.
  • a first embodiment of a treatment system designated as a whole by 100, for treating workpieces (not shown), shown in Fig. 1.
  • the treatment system 100 is used in particular for coating workpieces designed as vehicle bodies with a treatment fluid (not shown).
  • the treatment system 100 is used for electrocoating vehicle bodies with a paint.
  • the treatment plant 100 comprises a treatment zone 104 and a rinsing zone 106 arranged one behind the other in a main conveying direction 102.
  • the treatment zone 104 comprises a treatment pool 108, which is designed as a dip pool 110.
  • the rinsing zone 106 comprises two rinsing basins 112, one of which is designed as a spray rinsing basin 114 and the other as a dip rinsing basin 116.
  • the spray rinse basin 114 is arranged between the immersion basin 110 and the immersion rinse basin 116.
  • further spray rinsing tanks 114 may be arranged between the dip tank 110 and the dip rinsing tank 116 and further dip rinsing tanks 116 may be arranged downstream of the first dip rinsing tank 116 with respect to the main conveying direction 102.
  • the workpieces are treated with a treatment fluid; preferably, the workpieces are electrocoated with a paint in the dip tank 110.
  • the treatment fluid volume contained in an immersion tank 110 is hereinafter also referred to as the fluid bath.
  • the workpieces are rinsed with a filtrate of the treatment fluid, preferably with an ultrafiltrate of the treatment fluid.
  • the immersion tank 110 has an overflow area 118, which is separated by a weir 120 from a main volume 122 of the immersion tank 110, which is filled with the treatment fluid or contains the fluid bath.
  • the bath level of the fluid contained in the overflow area 118 is preferably lower than the bath level of the treatment fluid in the main volume 122 of the immersion tank 110.
  • the overflow area 118 serves to regulate the level of the bath in the main volume 122 and to safely discharge foam and/or other contaminants floating on the surface of the fluid bath.
  • the workpieces are preferably introduced and/or removed from the dipping tank 110 transversely to the main conveying direction 102, with workpieces designed as vehicle bodies preferably in a transverse orientation along the main conveying direction 102 and are accordingly introduced into or removed from the immersion tank 110 along their longitudinal axis.
  • the treatment plant 100 preferably comprises a main conveyor line with a main conveyor device (both not shown in Fig. 1), in particular a horizontal and/or rectilinear main conveyor line, wherein the immersion tank 110, the spray rinsing tank 114 and the immersion rinsing tank 116 are arranged on one side of the main conveyor line or on different sides of the main conveyor line, preferably each with a shorter side of the tank adjacent to the main conveyor line.
  • a main conveyor device both not shown in Fig. 1
  • the immersion tank 110, the spray rinsing tank 114 and the immersion rinsing tank 116 are arranged on one side of the main conveyor line or on different sides of the main conveyor line, preferably each with a shorter side of the tank adjacent to the main conveyor line.
  • the workpieces are conveyed along the main conveyor line in the main conveying direction 102 and from there the workpieces are introduced into and/or removed from the dip tank 110, the spray rinsing tank 114 and the dip rinsing tank 116.
  • the spray rinsing tank 114 is arranged or integrated in the area of the main conveyor line in such a way that each workpiece is conveyed along the main conveying direction 102 through the spray rinsing tank 114, i.e. without transverse conveyance into a tank arranged next to the main conveyor line.
  • the immersion tank 110 is preferably designed for a throughput of 5 to 15 car bodies per hour, preferably up to 10 car bodies per hour.
  • the immersion tank 110 is fluidly connected to a cooling circuit 124, a circulation circuit 126 and a filtrate circuit 126, which is preferably an ultrafiltrate circuit 128 or is designed as such, through each of which at least a portion of the treatment fluid is continuously passed.
  • the cooling circuit 124 comprises a pump device 132, a filter device 134 and a heat transfer device 136, wherein the filter device 134 is preferably arranged downstream of the pump device 132 and the heat transfer device 136 is preferably arranged downstream of the filter device 134.
  • the portion of the treatment fluid guided through the cooling circuit 124 is continuously cooled, since the treatment fluid during the electrocoating in the main volume 122 of the dipping tank 110 is heated by the process-related input of electrical power.
  • a sufficient amount of treatment fluid is pumped through the cooling circuit 124 to keep the fluid bath in the immersion tank 110 at a desired temperature even at maximum throughput of workpieces to be treated.
  • the volume flow in the cooling circuit 124 is at least one time, preferably one and a half times, the fluid bath of the immersion tank 110 per hour.
  • the circulation circuit 126 also comprises a pump device 132 and a filter device 134 arranged downstream thereof.
  • the circulation circuit 126 continuously supplies fluid from the overflow area 118 of the
  • diving basin 110 and feeds it to the main volume 122 of the diving basin 110.
  • circulation circuits 126 are provided on a dip tank 110, which circulate the fluid from the overflow area 118 into the main volume 122 of the dip tank 110.
  • the circulation circuit 126 is designed so that, together with the two other circuits 124 and 128, sufficient circulation of the treatment fluid in the main volume 122, i.e. the fluid bath, is achieved.
  • the volume flow in the circulation circuit 126 is preferably about one to two times, preferably one and a half times, the fluid bath in the immersion tank 110 per hour.
  • approximately two liters of ultrafiltrate per square meter of the workpiece surface are provided.
  • the amount of ultrafiltrate produced is determined according to the maximum throughput of the workpieces to be treated and remains constant even at a reduced throughput.
  • the volume flow in the ultrafiltrate circuit 130 is preferably approximately one times that of the fluid bath of the immersion tank 110 per hour.
  • fluid is preferably pumped out of the overflow area 118 by means of a pump device 132 and passed through a filter device 134.
  • the filtered fluid is then passed through an ultrafiltrate filter device 138, which has an ultrafiltration membrane, with a portion of the fluid components with small particle size penetrating the ultrafiltration membrane.
  • This ultrafiltrate is collected in a collection container 140. The remaining fluid is fed to the main volume 122.
  • the collected ultrafiltrate is fed to the immersion rinsing tank 116 by means of a further pump device 132.
  • the ultrafiltrate can be fed to the immersion rinsing tank 116 directly via a supply line 142 into the fluid bath of the immersion rinsing tank 116 or indirectly via a plurality of spray nozzles 144, with which the ultrafiltrate is preferably applied to workpieces emerging from the tank or which have just been immersed.
  • Two valve devices 146 one of which is provided for the direct supply line 142 and the other for the indirect supply by means of the spray nozzles 144, can be used to switch between the type of supply.
  • the spray nozzles 144 are preferably active whenever a workpiece is emerging from the immersion rinse tank 116.
  • the spray nozzles 144 can be arranged, for example, along the upper edge of the immersion rinse tank 116 or can be arranged as a ring or ring-like arrangement on the front side of the immersion rinse tank 116, through which the immersed workpiece is guided.
  • Ultrafiltrate is continuously passed from the immersion rinse tank 116 to the spray rinse tank 114.
  • the ultrafiltrate can be passed directly via a free overflow 148 and/or indirectly by means of spray nozzles 144 arranged on the spray rinse tank 114.
  • the spray nozzles 144 of the spray rinsing tank 114 are preferably provided for rinsing the already rinsed workpieces of the spray rinsing tank again, which is particularly the case when the workpieces leave the area or zone of the spray rinsing tank 114 and are conveyed further to the immersion rinsing tank 116.
  • the spray nozzles 144 of the spray rinsing basin 114 can also be switched on or off via a valve device 146.
  • the ultrafiltrate from the immersion rinse tank 116 is fed to the spray nozzles 144 of the spray rinse tank 114, preferably by means of a pump device 132.
  • the ultrafiltrate is fed by means of a further pump device 132 directly via a feed line 142 to the overflow area 118 of the immersion tank 110 and/or indirectly to the main volume 122 by means of spray nozzles 144 which are arranged on the immersion tank 110.
  • the type of supply of the ultrafiltrate to the immersion tank 110 or the return to the immersion tank 110 can also be switched via two valve devices 146, one of which is assigned to the direct supply line 142 into the overflow area 118 and the other to the indirect supply by means of the spray nozzles 144.
  • the direct supply line 142 of the ultrafiltrate from the spray rinsing basin 114 is made into the main volume 122 or into both the main volume 122 and the overflow area 118.
  • the ultrafiltrate is preferably applied to workpieces emerging from the immersion tank 110 or just emerging from the immersion tank 110, such as vehicle bodies, and/or to parts or sections of the conveyor system (not shown) provided for the insertion and removal of the workpieces, which are immersed in the fluid bath of the immersion tank 110.
  • the spray nozzles 144 of the dip tank 110 are preferably only active when a workpiece is emerging from the dip tank 110 in order to rinse off any foam adhering to it or any treatment fluid still running down.
  • the spray nozzles 144 of the immersion tank 110 can, comparable to the spray nozzles 144 of the immersion rinse tank 116, be arranged along the upper edge of the tank or can be arranged as a ring or ring-like on the front side of the immersion rinse tank 116, through which the immersed workpiece is passed.
  • the flow or stream of the ultrafiltrate from the immersion rinsing tank 116 to the immersion tank 110 is thus opposite to the main conveying direction 102.
  • the fill level of the fluid bath in the immersion rinsing tank 116 and in the immersion tank 110 is further preferably detected and/or monitored via at least one fill level measuring device 150.
  • Fig. 2 shows a second embodiment of a treatment plant 100, which comprises three immersion tanks 110, which are preferably arranged parallel to one another and border the main conveying line with one of their short sides.
  • the second embodiment in Fig. 2 essentially shows the filtrate circuit 128.
  • each of the immersion tanks 110 is connected to a cooling circuit 124 and a recirculation circuit 126, as can be seen in Figs. 4 and 5.
  • the rinsing zone 106 which comprises a spray rinsing tank 114 and a dip rinsing tank, is preferably passed through by all workpieces of the three dip tanks 110.
  • filtrate produced from all three immersion tanks 110 is combined to feed the rinsing zone 106.
  • the ultrafiltrate from each immersion tank 110 is collected in the collection container 140 after the ultrafiltrate filter device 138.
  • sink 112 to sink 112. Following the sink 112, which directly adjacent to the immersion tanks 110, i.e. in Fig. 2 the spray rinsing tank 114, the ultrafiltrate is divided between the immersion tanks 110.
  • the ultrafiltrate By feeding the ultrafiltrate into the rearmost rinsing basin 112 in the main conveying direction 102, i.e. in this case the immersion rinsing basin 116, and the cascade-like continuation into the adjacent rinsing basin 112 opposite to the main conveying direction 102, it is ensured that the workpieces which are conveyed in the main conveying direction 102 from the immersion basin 110 to the (last) immersion rinsing basin 116 are rinsed with purer ultrafiltrate in each of the successive rinsing processes in the rinsing zone 106 than in the respective preceding rinsing process.
  • the ultrafiltrate absorbs more components of the treatment fluid, in particular paint components, which are finally returned to the dip tank 110.
  • the three dipping tanks 110 are preferably all of the same type and designed for a combined throughput of 25 to 35 workpieces per hour, preferably 30 workpieces, in particular vehicle bodies, per hour.
  • a treatment system 100 with three dip tanks 110 in the treatment zone 104 as well as a spray rinsing tank 114 and a dip rinsing tank 116 in the rinsing zone 106 is the preferred embodiment, in particular for the electrocoating of vehicle bodies.
  • the amount of filtrate or ultrafiltrate produced per immersion tank 110 is recorded via a separate measuring device 152, preferably a flow measuring device 154, which is preferably arranged between the ultra-filter device 138 and the collecting container 140.
  • a further measuring device 152 preferably a flow measuring device 154.
  • valve devices 146 of the supply line 142 and the spray nozzles 144 of the immersion tanks 110 are preferably designed as automatic valves, so that by means of these automatic valves it can be regulated that the respectively returned amount of ultrafiltrate corresponds at least approximately to the respectively produced amount of ultrafiltrate.
  • This loss is preferably compensated by adding demineralized water 156 to the last rinsing basin 112, i.e. the immersion rinsing basin 116.
  • the amount of demineralized water 156 added can be regulated so that the fill level of the immersion rinse tank 116 remains constant, i.e. the bath level of the immersion rinse tank 116 remains constant, wherein the fill level is detected and/or monitored via the fill level measuring device 150 arranged on the immersion rinse tank 116.
  • the supply of demineralized water 156 can be effected directly from a supply line into the (last) immersion rinsing basin 116 or in the form of a cascade-like supply from a further rinsing zone 106 downstream in the main conveying direction 102, the rinsing basins 112 of which are operated with demineralized water.
  • a shut-off valve 158 is preferably provided, by means of which the associated immersion tank 110 can be taken out of operation.
  • the treatment plant 100 is modular, at least with respect to the immersion tanks 110.
  • the affected immersion tank 110 is at least temporarily removed from the filtrate circuit 128.
  • Fig. 3 shows a third embodiment of a treatment plant 100, which comprises two parallel immersion tanks 110.
  • the respective circulation circuit 126 is intended to generate sufficient circulation in the main volume 122 of the immersion tank 110 so that the workpiece to be treated is sufficiently supplied with the treatment fluid for the treatment process and that the treatment fluid is sufficiently mixed.
  • the treatment fluids of the various immersion tanks 110 may be continuously mixed, for example, to ensure a nearly identical quality of the treatment fluid in all immersion tanks 110.
  • the individual immersion tanks 110 are also less sensitive to process changes. Furthermore, the effort required for Regular monitoring of the fluid bath parameters can be reduced, since not all parameters need to be measured for each immersion tank 110.
  • the mixing of the treatment fluids can be achieved by passing the respective treatment fluid, preferably downstream of the filter device 134 of the respective circulation circuit 126, through a common mixing pipe 160 with at least one pipe section 162.
  • the diameter of the pipe section 162 is preferably selected such that the flow velocity of the treatment fluid in the mixing pipe 160 does not exceed the value of 2 m/s when all immersion tanks 110 are in operation and does not fall below the value of 1 m/s when an immersion tank 110 is taken out of operation.
  • the flow velocity in all operating conditions is preferably between 1.1 m/s and 1.7 m/s.
  • the mixing pipe 160 has a larger diameter than the other pipes of the circulation circuits 126.
  • the treatment fluids are fed to the mixing tube 160 at a first end 164 and divided at a second end 166 into the partial flows of the involved circulation circuits 126 and returned to the immersion tanks 110.
  • the mixed fluid is preferably returned directly to the main volume 122 of the immersion tanks 110.
  • the distribution of the partial flows into the individual immersion tanks 110 is controlled by automatic valves 168 in the return lines 170.
  • the position of the automatic flaps 168 is controlled based on the fill levels in the immersion tanks 110, for which each immersion tank has a fill level measuring device 150.
  • the aim of the control is to keep the fill level in all immersion tanks 110 approximately the same.
  • the automatic flap 168 is opened by an immersion tank 110 whose fill level deviates upwards from the average of the fill levels of all immersion tanks 110. at least partially closed, whereby automatic flaps 168 of immersion tanks 110, whose filling levels deviate downwards from the mean value, ie are lower than the mean value, are opened further at the same time.
  • flow measuring devices 154 can be provided in the return lines 170.
  • a deviation of a filling level of 1% from the mean value can be defined as a permissible deviation or as a triggering criterion for readjustment of the automatic flaps 168 in order to keep the total deviation preferably within a range of approximately 2%.
  • a bypass line 172 can additionally be provided in each circulation circuit 126, which allows the mixing pipe 160 to be bypassed.
  • shut-off valve 158 is provided in the bypass line 172, which is opened for bypassing, while the supply to the mixing pipe 160 and the return from the mixing pipe are also blocked by means of shut-off valves 158.
  • bypass line 172 allows the emptying of the affected immersion tank 110 for, for example, maintenance work or the operation of individual immersion tanks 110 with a different treatment fluid, for which mixing via the circulation circuits 126 is not permitted, but mixing of the filtrates produced from the different treatment fluids is permitted.
  • the mixing pipe 160 comprises only one pipe section 162 with a constant diameter.
  • bypass line 172 is opened for one of the two immersion tanks 110 and the corresponding shut-off valves 158 in the supply and return lines are closed, for example so that no mixing takes place or the affected immersion tank 110 can be taken out of operation
  • the bypass line 172 of the other immersion tank 110 is also opened and the associated shut-off valves 158 in the supply and return lines are closed. Consequently, in this case, no flow passes through the common mixing pipe 160.
  • the inlet of the partial flows from the involved circulation circuits can be tangential at the first end 164 of the mixing tube 160 and/or swirling-promoting internals can be provided at the first end 164 in the mixing tube 160.
  • Fig. 4 shows the interaction of the circulation circuits of the second embodiment of a treatment plant 100 with three immersion tanks 100.
  • the mixing pipe 160 preferably comprises two pipe sections 162 with different diameters, wherein the pipe section 162 into which the partial flows of the recirculation circuits 126 enter or flow, i.e. the pipe section with the first end 164 of the mixing pipe 160, has the larger of the two pipe section diameters.
  • the mixing of the treatment fluids of all immersion tanks 110 therefore takes place in the pipe section 162 with the larger diameter, hereinafter referred to as the second pipe section.
  • a branch of a partial flow is provided for the return to one of the immersion tanks 110, so that the subsequent pipe section 162 with the smaller diameter, hereinafter referred to as the first pipe section, is only flowed through by a reduced fluid flow, which preferably corresponds to the partial flows of two immersion tanks 110.
  • both pipe sections 162 of the mixing pipe 160 are nevertheless flowed through by the partial flows from the two remaining immersion tanks 110.
  • the third immersion tank 110 must also be operated in bypass, whereby the mixing pipe 160 is not flowed through in this case.
  • the mixing pipe 160 is essentially extended by a pipe section 162, and the supply is relocated to its end, the then adapted first end 164 of the mixing pipe 160.
  • demineralized water 156 is added to the overflow areas 118 of the immersion tanks 110, as shown in Figs. 3 to 5.
  • the amount of demineralized water 156 added is regulated based on the fill level in the main volume 122 of the respective immersion tank 110 so that the level of the bath remains approximately constant, the fill level being detected and/or monitored by a fill level measuring device 150.
  • the total fill level of all immersion tanks 110 is preferably considered to determine the amount of demineralized water 156 to be refilled. Either a lower limit value for the total fill level or the temporal development of the total fill level can be considered as a criterion.
  • Fig. 5 shows the complete second embodiment of the treatment plant 100 with three immersion tanks 110, wherein in Fig. 5 all cooling circuits 124, all circulation circuits 126 with common mixing pipe 160 and the connected filtrate circuits 128 are shown.
  • the treatment of workpieces, in particular the coating of vehicle bodies, results in a constant discharge of components of the treatment fluid, in particular paint components such as pigments, binders and additives, which must be continuously replenished or replaced to ensure consistent quality of the treated workpieces.
  • the addition or replenishment preferably takes place in the respective cooling circuit 124 and the filtrate circuit 128, wherein for a rapid mixing of these components the component to be added or refilled takes place upstream of the first pump device 132.
  • Pigment paste 174 is preferably added in the cooling circuit 124, whereas the non-solids-containing mixture 175 of binder and solvent is introduced upstream of the pump device 132 of the filtrate circuit 128, which is arranged between the immersion tank 110 and the collection tank 140.
  • the separation of these two components according to circuits is based on the fact that both components should not be added simultaneously at the same point, since undesirable effects, such as agglomerations, can occur in high concentrations if they are mixed directly.
  • the binder can also be added in the overflow area 118 of the immersion tank 110, where additional components such as an acid 176 can also be added to regulate the pH of the treatment fluid.
  • a measuring or sampling point can ideally be provided downstream of the mixing tube 160. In this way, the fluid bath parameters for all mixed immersion tanks 110 can be analyzed simultaneously. If necessary, additional measurements can be performed in the individual immersion tanks 110.
  • first, second or third embodiment of a treatment plant 100 preferably comprises one or more of the has features and/or advantages described in connection with the other two embodiments.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating Apparatus (AREA)

Abstract

L'invention concerne une installation de traitement (100) utilisée pour le traitement de pièces, en particulier pour appliquer un revêtement, par exemple appliquer un revêtement par immersion, de carrosseries de véhicules, l'installation de traitement (100) présentant une direction de transport principale (102) et comprenant ce qui suit : au moins une zone de traitement (104) comportant au moins un bassin de traitement (108), en particulier au moins un bassin d'immersion (110), pour le traitement des pièces au moyen d'au moins un fluide de traitement, en particulier pour appliquer un revêtement par immersion sur les pièces au moyen d'au moins un vernis ; et au moins une zone de rinçage (106) comprenant au moins un bassin de rinçage (112) pour rincer les pièces traitées avec un filtrat du ou des fluides de traitement, en particulier un ultrafiltrat du ou des fluides de traitement, la ou les zones de rinçage (112) étant disposées dans le sens de transport principal (102) après la ou les zones de traitement (104), le ou les bassins de traitement (108) de la zone de traitement (104) étant reliés de manière fluidique à au moins un circuit de refroidissement (124) pour refroidir au moins une partie du fluide de traitement et/ou à au moins un circuit de filtrat (128), en particulier au moins un circuit d'ultrafiltrat (130), pour produire le filtrat, en particulier l'ultrafiltrat, et rincer les pièces traitées avec le filtrat, en particulier l'ultrafiltrat. En outre, l'invention concerne un procédé correspondant de traitement de pièces.
PCT/DE2024/100907 2023-10-30 2024-10-23 Installation de traitement pour le traitement de pièces et procédé de traitement de pièces Pending WO2025093080A2 (fr)

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DE102023129933.6 2023-10-30
DE102023129933.6A DE102023129933A1 (de) 2023-10-30 2023-10-30 Behandlungsanlage zum Behandeln von Werkstücken und Verfahren zum Behandeln von Werkstücken

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Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
DE3625171C1 (de) * 1986-07-25 1988-02-25 Herberts Gmbh Verfahren und Vorrichtung zur Tauchbeschichtung von Objekten mit fluessigen Beschichtungsmaterialien mit anschliessender Spuelung unter Verwendung von Ultrafiltrat
DE10132349B4 (de) * 2001-07-04 2006-08-17 Eisenmann Maschinenbau Gmbh & Co. Kg Verfahren und Anlage zur kataphoretischen Tauchlackierung von Gegenständen
DE102010054932A1 (de) * 2010-12-17 2011-08-25 Daimler AG, 70327 Anlage und Vorrichtung zum Lackieren eines Objekts
DE102012218495A1 (de) * 2012-10-11 2014-04-17 Bayerische Motoren Werke Aktiengesellschaft Verfahren und Vorrichtung zur kathodischen Tauchlackierung
DE102014006795B4 (de) * 2014-05-09 2018-02-15 Eisenmann Se Anlage und Verfahren zum Beschichten von Gegenständen
DE102018130593A1 (de) * 2018-11-30 2020-06-04 Eisenmann Se Oberflächenbehandlungsanlage, Präkonditionierungseinrichtung und Verfahren zum Aufbereiten von Prozessmedium und/oder Spülmedium
DE102021214826A1 (de) * 2021-12-21 2023-06-22 Dürr Systems Ag Behandlungsanlage und Verfahren zum Behandeln von Werkstücken
DE102021214987A1 (de) * 2021-12-23 2023-06-29 Dürr Systems Ag Behandlungsanlage und Verfahren zum Behandeln von Werkstücken

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