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
  • B05B5/1625—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 the insulating means comprising an intermediate container alternately connected to the grounded material source for filling, and then disconnected and electrically insulated therefrom
  • B05B5/1633—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 the insulating means comprising an intermediate container alternately connected to the grounded material source for filling, and then disconnected and electrically insulated therefrom the arrangement comprising several supply lines arranged in parallel, each comprising such an intermediate container
• • 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
  • 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
  • B05B5/1625—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 the insulating means comprising an intermediate container alternately connected to the grounded material source for filling, and then disconnected and electrically insulated therefrom

Definitions

• the invention relates to an electrical separation unit for a fluid delivery line.
• the position of different pigs must be monitored using detectors, whereby always between pigs delimiting the front end of a paint package and Pigs, which limit the rear end of a paint package, must be distinguished.
• the present invention is intended to provide an electrical separation unit for a fluid delivery line in which it can be ensured in a simpler manner and also without the use of co-operating position sensors that the separation unit accomplishes the desired electrical insulation.
• a fluid channel is formed in a housing, which can be selectively released for delivery of the fluid or can be closed by a displacement body.
• a displacement body about the dimension of the displacement body, the dimension and thus the quality of the electrical insulation can safely specify. That the displacement body is in each case in the correct position, is ensured in the mechanically simple construction of the separation unit.
• the development of the invention according to claim 2 is advantageous because it receives the adjustment of Ver ⁇ Verticianungs stressess between the conveying position and the release position without relative movement under sliding.
• the separation unit is therefore characterized by the fact that, even in the presence of manufacturing tolerances and impurities, it can be reliably and substantially frictionless.
• the fluid channel also has a streamlined shape and is particularly easy to clean. The same applies to the displacement body.
• the pressurizable displacement body also specifies a precise wall surface of the fluid channel in the pressureless state. This is particularly advantageous if the separation unit is part of a piggable conveying system, since the pigs then also clean the inner surface of the displacement body.
• the displacement body successively displaces the fluid located in the fluid passage to one of the connection openings of the housing. This avoids fluid inclusions between the layers of the compressed plate displacement body.
• the development of the invention according to claim 13 has the advantage that one can accomplish the transition between the delivery position and blocking position of the separation unit, without the need for fluid to be discharged into the separation unit containing line.
• the displacement of the amount of fluid in the separation unit takes place in the direction transverse to the conveying direction, so that the standing in the line fluid volume remains unchanged.
• Figure 1 A schematic representation of a Häplat ⁇ zes for electrostatic spray painting with a arranged in a paint delivery line voltage-separation unit, which is shown in axial section;
• FIG. 2 shows an axial section through the separation unit according to FIG. 1 on an enlarged scale
• FIG. 3 shows a transverse section through a modified displacement sleeve for a separation unit according to FIGS. 1 and 2;
• FIG. 4 shows an axial section through a further reduced displacement sleeve for a separation unit according to FIGS. 1 and 2;
• FIG. 5 shows a transverse section through a further modified separation unit in the closed position;
• FIG. 6 shows a section similar to that of FIG. 5, but showing the separation unit in a conveying position
• FIG. 7 shows an axial section through a further diverted separation unit
• FIG. 8 an axial section through a further modified separation unit
• FIG. 9 shows a schematic representation of an electrostatic multicolour spray system in which separation units are used, as shown in FIGS. 1 to 8;
• FIG. 10 shows an axial section through a pig unit of the spray system shown in FIG. 9 in a larger scale.
• FIG. 1 denoted by 10 is a spray gun, which is connected to the outlet of a paint pump 14 via a line 12. The latter sucks paint from a storage container 16, which contains a paint volume 18 of predetermined color.
• the electrostatic spraying method is used.
• a schematically indicated at 20 workpiece is connected via a line 22 to ground, while the spray gun 10 via a line 24 to the output of a high voltage generator 26th connected is .
• Paints used for spraying vehicles in particular metallic paints, have an electrical conductivity that is quite significant when exposed to high electric field strength. This applies even more to water-based paints.
• a separation unit 28 is inserted into the conduit 12. This ensures that, under operating conditions, the potential of the high-voltage generator 26 is blocked off against earth, and indeed also with respect to the conveyed paint (or other conveyed electrically conductive liquids or flowable powder).
• the separation unit 28 has a sleeve-shaped housing 30 made of electrically good insulating plastic material, which is provided with flanges 32 at its ends.
• a cylindrical chamber 34 is formed, which is connected via a lateral connection piece 36 of the housing and via a 2/2-way solenoid valve 38 to the delivery side of a compressed air-providing compressor 40.
• a perforated supporting body 42 is arranged offset from the wall surface radially inwardly, which is supported axially on the end walls of the chamber 34.
• the support body 42 serves to support a deformable displacement sleeve 44 in the radial outward direction in a delivery position of the separation unit 28.
• This Hose is made of an electrically well insulating elastomeric material and has a cylindrical basic geometry when unloaded. Radial mounting flanges 46 are formed on the ends of the displacement sleeve 44. These find in corresponding annular Ver ⁇ depressions 48 recording which a Einlenfinöf opening 50 or. an outlet opening 52 of the housing 30 are surrounded and provided in the end faces of the housing 30. On the end faces of the housing 30, two annular clamping plates 54 are fastened by means of screws 56 indicated only schematically. These have central openings 58, which provide a smooth continuation of the inlet opening 50 or. the outlet port 52 represent.
• the axial dimension of the recesses 48 is, as usual with seals, such that it is slightly smaller than the axial dimension of the mounting flanges 46, so that the latter 54 are somewhat compressed with screwed clamp plates.
• the separation unit 28 thus has end flanges formed by the bolted flanges 32 and clamping plates 54. These end flanges are in turn connected to flanges 60 which are provided at the separation unit 28 facing ends of the pieces of the conduit 12 and are connected tightly with these ends.
• the displacement sleeve 44 moves from the conveying position indicated in FIG. 1 and 2 to a locking position represented by solid lines. In this locking position, the sleeve sleeve-shaped displacement sleeve is pushed together to form two superposed layers, similar to pinch valves. This squeezing occurs over most of the axial dimension of the displacement sleeve 44.
• the clamping plates 54 are made of electrically conductive material. Thus, they also represent electrodes that can be used for a resistance measurement of the separation unit 28.
• the clamping plates 54 via lines 66, 68 with the two inputs of a counter- Standsmeß réelles 70 connected, which is also designed as a discriminator. This can work in the usual way, for example, measure the current that flows in each case impressed voltage between the two clamping plates 54. If this current is below a predetermined threshold value, ie if the resistance of the separation unit 28 is above a predetermined resistance value, then the resistance measuring device 70 generates a free signal at its output.
• This enable signal is combined in an AND gate 72 with a control signal which is provided by a controller 74 for the spray gun 10.
• the controller 74 controls the 2/2-way solenoid valve 38 in the forward position and at the same time gives its control signal to the AND gate 72.
• the controller 74 controls the 2/2-way solenoid valve 38 in the forward position and at the same time gives its control signal to the AND gate 72.
• the controller 74 controls the 2/2-way solenoid valve 38 in the forward position and at the same time gives its control signal to the AND gate 72.
• the controller 74 controls the 2/2-way solenoid valve 38 in the forward position and at the same time gives its control signal to the AND gate 72.
• the controller 74 controls the 2/2-way solenoid valve 38 in the forward position and at the same time gives its control signal to the AND gate 72.
• the controller 74 controls the 2/2-way solenoid valve 38 in the forward position and at the same time gives its control signal to the AND gate 72.
• the controller 74 controls the 2/2-way solenoid valve 38 in the forward position and at the same time gives its control signal to the AND gate 72.
• the clamping of the ends of the displacement sleeve 44 in the housing 30 is made so that the Verdrän ⁇ supply sleeve 44 in its initial geometry, which is obtained upon depressurization of the chamber 34, a smooth continuation of the inner surfaces of the openings 58 of Klemm ⁇ plates 54 represents.
• the inlet opening 50 and the outlet opening 52 have a radius which is greater than the radius of the openings 58 of the clamping plates 54 exactly by the wall thickness of the unbela ⁇ steten displacement sleeve 44.
• the inner surface of the support body 42 provides a smooth continuation of the inlet opening 50 and Outlet opening 52 is.
• the axially outer and radially inner edges of the inlet opening 50 and the outlet opening 52 are rounded, as shown at 88.
• the clamping rings 88 have at their axially inner inner edge wedge-shaped ribs 90 which have on their axially inwardly facing side a contour which runs at the distance of the wall thickness of the Verdrteilungs ⁇ sleeve 44 parallel to the rounding 88. In this way one obtains a practically bumpless continuous Inner surface of the separation unit 28 when the displacement sleeve 44 is not pressurized. This makes it possible to use a separation unit as described above also in piggable systems.
• the displacement sleeve 44 is now firmly closed at its ends by end walls 94.
• the interior of the displacement sleeve 44 can again be controlled by compressed air.
• the displacement sleeve 44 has no mounting flanges 46 but rather is fixedly connected to the wall of the chamber 34 by a part of its peripheral surface adjacent to the nozzle 36, e.g. bonded.
• the two peripheral halves of the displacement sleeve 44 lie one above the other, as shown in FIG. If desired, the displacement of the displacement sleeve 44 from the blocking position into the conveying position can be accomplished or supported by applying a negative pressure to the connection piece 36.
• the chamber 34 can be formed with two different halves as a modification:
• the one half of the chamber has a radial dimension which is twice the wall thickness of the displacement sleeve 44 than the radius of the other half of the chamber , In this way, in the conveying position of the separating unit 28, a substantially continuous cylindrical inner surface of the separating unit is again obtained, so that it is also well suited for piggable systems.
• the displacement sleeve 44 can be made somewhat conical in a further embodiment of the invention, so that the larger one Diameter-bearing portion of the displacement sleeve at lower pressures already in contact with the chamber wall comes as the smaller diameter portions of the Verdrfitungs ⁇ sleeve 44th
• the displacement sleeve 44 only needs to be deformed less elastically. It is essentially being transferred to itself.
• a pressure application can also be effected by using a sufficiently insulating liquid, in particular an insulating oil such as transformer oil.
• the separation unit 28 shown in Figure 7 again has a made of electrically good insulating material
• a channel 96 is formed, in which a made of electrically good insulating material displacement rod 98 is tightly displaceable.
• a drive 100 which may be formed by a linear motor such as a double-acting cylinder.
• the inlet port 50 of the separation unit 28 is connected to the channel 96 via an S-shaped channel 102.
• the outlet opening 52 is connected via an oppositely S-shaped channel 104 with the channel 96, so that both An ⁇ connections of the separation unit 28 are coaxial. Where this does not matter, the outlet port 52 may also communicate directly with the channel 96.
• the separation unit shown in FIG. 7 operates roughly as follows:
• the paint conveyed by the metering pump 14 is conveyed through the separation unit 28 to the spray gun 10.
• the displacement rod 98 is moved into the channel 96 and pushes there still located paint in the buffer 80th
• the fit between the displacement rod 98 and the channel 96 is so good that the approximately remaining paint film between the opposing surfaces of the displacement rod and channel is so thin that one obtains a very high overall resistance.
• a housing 30 which is made of a good electrical insulating material and is held by metallic end plates 54.
• a chamber 106 is formed, in which a slider 108 is arranged, which is also made of electrically good insulating material.
• a bore 110 is formed, which is movable into a position aligned with the inlet opening 50 and the outlet opening 52 in which the separation unit specifies a piggable smooth through-opening. From this conveying position, the slide 108 can be moved in the direction transverse to the axis of the bore 110 by a drive 100, as shown schematically in Figure 8.
• the paint column located in the bore 110 is also moved out of the line 12 electrically. Only by a remaining on the cooperating surfaces of slider 108 and housing 30 thin paint film could still flow a small amount of current. Its amount can be reduced by the fact that the fit between Improved slider and housing, on the other hand also reduce by increasing the stroke of the slider movement
• FIG. 9 shows the fluidic part of a multicolour spray system, wherein the loading of an electrostatic spray gun 201 with high voltage has been omitted for the sake of clarity.
• the paint supply system shown in FIG. 9 serves to supply an atomizing sprayer 201, which is shown at the top of the figure, optionally with one of the paints of different color, which circulate in the paint supply lines 202 shown at the bottom of FIG.
• an atomizing sprayer 201 which is shown at the top of the figure, optionally with one of the paints of different color, which circulate in the paint supply lines 202 shown at the bottom of FIG.
• there are seven such color supply lines 202 so that seven paint colors can be processed.
• a solvent supply line 203 In parallel to the paint supply lines 202 also extend a solvent supply line 203, a disposal line 204 and a compressed air line 205th
• This system branch comprises as the most important components a first pig station 20 ⁇ a adjacent to the paint supply lines 202 and a second pig station 207a adjacent to the atomizer 201.
• the design of all pigs tions 206a, 206b, 207a, 207b in the paint supply system is identical, so that it is sufficient to explain the construction of the pig station 206a in more detail with reference to FIG.
• the pig station 206a comprises a housing 208a, in which a movement channel 209a for two pigs 210a, 211a arranged one behind the other is formed.
• the two pigs 210a and 211a are shown in Figures 9 and 10 within the pig station 206a in their respective parking positions.
• a total of four channels 214a, 215a, 216a, 217a lead to the movement channel 209a through the housing 208a, via which different media can be introduced at different points of the movement channel 209a in a manner to be described.
• the middle channel 215a in FIG. 10 leads to the end of the movement channel 209a, so that the medium supplied here can act on the end face of the pig 211a located at the bottom in FIGS. 9 and 10.
• the other channels 214a, 216a, 217a open from opposite sides into the movement channel 209a at a location which is between the two pigs 210a and 211a, so that the space between these two pigs 210a and 211a can be reached ,
• shut-off valve 267a, 218a, 219a In each of these three channels 214a, 216a, 217a is in each case a shut-off valve 267a, 218a, 219a.
• a stopper 220a can be retracted. Extending the pigs 210a, 211a from the pig station 206a or retracting these pigs 210a, 211a into the pig station 206a is possible only when the stopper 220a is withdrawn.
• the lower left channel 214a of the pig station 20Sa is connected to the solvent supply line 203 via a line 221a in which a check valve 222a is located.
• the channel 217 located on the top left in FIG. 9 is connected to the compressed air line 205 via a line 223a in which a shut-off valve 224a is located.
• the lower right channel 216a in FIG. 9 is connected to a color changing unit 227a via a pipe 225a in which a quantity measuring unit 226a is located.
• the color changing unit 227a in turn is connected via a total of nine stubs 228a both with the Farberss ⁇ lines 202 and with the solvent supply line 203 and the disposal line 204 in connection.
• the color changing unit 227a is capable of selectively establishing a connection between the line 225a and one of the lines 202, 203, 204.
• the channel 215a extending in the middle, lower region of the housing 208a of the pig station 206a is connected to a changeover valve 231a via a line 229a in which a controllable throttle valve 230a is located.
• the changeover valve 231a is capable of selectively connecting the line 229a to a first branch line 232a or a second branch line 233a or to interrupt both connections.
• the left branch line 231a in the drawing leads via a shut-off valve 233a to the compressed-air supply line 205, while the right-hand branch line 232a in the drawing leads via a shut-off valve 234a to the disposal line 204.
• the mouth of the movement channel 209a of the scraper station 206a is connected via a pig pipe 235a, shown only diagrammatically in the drawing, to the mouth of the pig Movement channel 209a connected in the opposite direction, the atomizer 201 adjacent pig station 207a connected.
• the pig pipe 235a may be a flexible hose whose internal diameter is adapted in a known manner to the outside diameter of the pigs 210a, 211a so that the lateral surfaces of the pigs 210a, 211a bear in a fluid-tight manner against the inside surface of the pig pipe 235a during their movement through the pig pipe 235a ,
• the various channels 229a, 214a, 215a, 216a and 217a of the atomizer station 207a near the atomizer are incorporated into the system in the following manner:
• the channel 217a is connected via a line 236a to a compressed air collecting line 237, which in turn is connected to the compressed air line 205 via a shut-off valve 238.
• the channel 214a of the pig station 207a is connected via a line 239a to a solvent collecting feed line 240a, which communicates via a shut-off valve 241 with the solvent feed line 203.
• the solvent collection supply line 240 is interrupted at one point by a separation unit 28 as described above.
• the channel 215a of the atomiser near the pigging station 207a is in turn connected via a line 243a, in which a controllable throttle valve 244a is located, with a diverter valve 245a.
• the diverter valve 245a is capable of selectively connecting or shutting off the conduit 243a to one of two conduits 246a and 247a, respectively.
• the upper line 246a in the drawing leads to a disposal collecting line 248, which in turn via a separation unit 28 and a shut-off valve 250 with the disposal line 204 is connected.
• the channel 216a of the atomiser station 207a nearest to the atomizer is connected via a line 250a to a further changeover valve 251, to which the line 250b corresponding to the line 250a leads to the system branch on the right in the drawing.
• the diverter valve 251 is capable of selectively connecting or shutting off each of the lines 250a, 250b to one of four lines 252, 253, 254, 255.
• the lowest in the drawing line 252 leads to the disposal manifold 248, the overlying line 253 to the solvent-collecting supply line 240, the overlying line 254 to the compressed air manifold 237 and from the diverter valve 251 substantially upwardly extending line 255 to a metering pump 256, the outlet of which in turn communicates with the atomizer 201.
• the metering pump 256 can also be supplied via a line 257 from the solvent-collecting feed line 40 with solvent.
• the atomizer 201 is finally connected via a further line 258 to the disposal manifold 248.
• the pig 210a displaces the air lying in the direction of movement in the pig pipe 235a.
• This station is supplied via the movement channel 209a of the pig station close to the atomizer 207a, its channel 215a and the line 243a and, if the changeover valve 245a is in the appropriate position, via the line 246a and the disposal line 248 with the shut-off valve 250 open to the disposal line 204.
• the throttle valve 244a which lies downstream of the atomizer station 207a close to the atomizer, is adjusted in such a way that the desired movement speed of the pig 210a in the pig pipe 235a.
• the amount of paint placed in the space between the moving pig 210a and the pig 211a still in its park station in the pig station 206a is monitored by the flow meter 226a.
• both the corresponding shut-off valve in the color change unit 227a and the shut-off valve 218a in the pig station 206a are closed.
• the second pig 211a is connected to the compressed air line 205 at the lower end side in the drawing via the line 229a and the corresponding Umstell- valve 231a after the shut-off valve 233a has been opened.
• the compressed air now also pushes the pig 211a out of the pig station 206a and, via the paint enclosed between the two pigs 210a and 211a, advances the pig 210a first exited from the pig station 206a, which has been pushed forward by the paint up to this point.
• a type of "package” now forms from the two pigs 210a and 211a and the paint volume enclosed between them, which is moved forward in the pig pipe 235a by the compressed air supplied via the line 229a.
• the throttle valve 230a in the conduit 229a is thereby fully opened.
• the leading pig 210a After passing through the pig pipe 235a, the leading pig 210a initially enters the pig station 207a close to the atomizer, it being understood that its stopper 220a must be retracted. The reaching of the terminal and parking position for the pig 210a is detected by the detector 213a of the pig station 207a. Now in the Diverter valve 245a the connection to the disposal line 248 interrupted. At the same time, the line 250a is connected to the metering pump 256 via the line 255 by means of a corresponding changeover of the changeover valve 251.
• the paint volume is displaced via the lines 250a and 255 to the metering pump 256 out.
• the workpiece such as a body, to be painted.
• the respectively required amount of paint is adjusted by the metering pump 256.
• the high voltage is taken from the atomizer 201.
• the atomizer 201, the metering pump 256 and the line 255 between metering pump 56 and Umsehaltventil 251 is flushed via the lines 253 and 257 at a corresponding position of the switching valve 251 and via line 258 with open shut-off valves 241 and 250.
• the remaining paint remaining between the pigs 211a and 210a in the pig station 207a is disposed of by placing the changeover valve 251 so that the line 250a is now connected to the line 252 and therefore to the removal line 204.
• the stopper 220a of the pig station 207a is extended, whereby both pigs 210a, 211a are held in the pig station 207a close to the atomizer. Then, the paint in the line 250a, which connects the pig station 207a with the changeover valve 251, disposed of in the following manner: The valves 267a and 218a of the pig station 207a are opened and the changeover valve 251 is operated so that a connection between the line 250a and the disposal manifold 248 is made.
• solvent can flow through the space lying between the two pigs 210a, 211a and the line 250a and clean the corresponding paths.
• the flow can take place alternately in pulsed form with compressed air and with solvent.
• solvent is pushed out by compressed air.
• the stopper 220a of the pig station 207a is zu ⁇ retracted, so that the way for the pigs 210a, 211a is free.
• the throttle valve 230a which is downstream of the pig station 206a in the direction of flow, is now adjusted more so that a certain resistance for the displaced in the pig pipeline 235a results, whereby the speed of movement of the pigs 210a, 211a and of the enclosed between these solvent volume is determined.
• opening the valve 267a of the pig station 207a with the shut-off valve 241 open brings it into the intermediate space between the two pigs 210a and 211a via the solvent collecting feed line 240 and the line 239a.
• the pig 211a leading in this case is pushed out of the pig station 207a.
• a further detector 260a which is responsive to the passage of the two pigs 210a, 211a, is mounted in the vicinity of the pig pipe 235a. If the detector 260a detects that the leading pig 211a has passed the corresponding location in the pig pipe 235a, the valve 267a is closed and the further supply of solvent into the space between the two pigs 210a, 210b is interrupted.
• the pig 211a which precedes this cleaning process finally enters the pig station 206a adjacent to the supply lines 202. If the detector 213a of the pig station 206a detects that the pig 211a has again reached its parking position shown in the drawing, the connection between the line 229a and the discharge line 204 in the changeover valve 231a is interrupted. Instead, the valve 218a of the pigging station 206a and the corresponding valve inside the color changing unit 227a are opened so that the volume of solvent enclosed between the two pigs 210a, 211a can be forced into the discharge line 204 via the line 225a and the color changing unit 227a. At the same time, the connection line 225a and the quantity measuring unit 226a lying in it are simultaneously cleaned of lacquer.
• the stopper 220a of the pig station 206a is retracted so that both pigs 210a, 211a are held in the pig station 206a.
• the flushing process can be continued. Again, by alternately opening the valves 267a and 219a of the pig station 206a, it is possible to clean them alternately in pulses with compressed air and with solvent. The last flushing should be done with compressed air again.
• valves 218a of the pig station 206a and leading to the disposal line 204 shut-off valve of the color changing unit 227a are closed.
• the left in the drawing system branch is now completely cleaned and for a new paint job with the same or a different color ready.
• the paint supply system can be operated in the manner described above with a single system branch.
• the second system branch is provided which, as already mentioned, is identical to the first system branch.
• the two system branches are driven counterclockwise in the sense that there is always one in the mode in which paint is transported towards the atomizer 201, while the other is in the cleaning mode, in which the corresponding pig pipe 235a or 235b and the other components of this system branch are removed from the paint residues.
• a separation unit 28 is inserted, as described above with reference to FIGS. 1 to 8 was explained.
• this insertion occurs in the vicinity of the parts to be held at high voltage at substantially equivalent locations the line to keep the high-voltage Anlagen ⁇ parts small and at the same time to ensure that adjacent parts of the system are as close as possible to the same potential.
• the separation units 28 can additionally take over the function of servo valves when lines are cleaned when cleaning the system with solvent and / or compressed air.
• the separation units provide a free passage for the conveyed medium in the delivery position. They also have only very small dead spaces. In the conveying position there is no appreciable pressure loss. They are also easy to implement with good quality and leak-free. Furthermore, they are very easy to handle.
• Chloroprene polymers such as neoprene, EPDM (ethylene / propylene terpolymer), fluoroelastomers such as Viton, PTFE (polytetrafluoroethylene), and chlorobutyl polymers are particularly suitable as material for insulating elastomeric displacement bodies.
• these materials In addition to their ductility and good electrical insulation, these materials also have the advantage that they are generally resistant to abrasion, so that the separations also have a long service life when conveying abrasive media such as paints.
• Suitable materials for insulating housings of the separation units are, in particular: polytetrafluoroethylene, polyamide, polyethylene, polyoxymethylene, polyvinylidene fluoride, polypropylene, in particular PP ST1000.
• those embodiments described above, which have deformable displacement body they were connected using clamping pieces tightly connected to the housing of the separation unit.

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• 2004
  • 2004-11-24 DE DE102004056789A patent/DE102004056789A1/de not_active Withdrawn
• 2005
  • 2005-10-05 US US11/791,392 patent/US20100043703A1/en not_active Abandoned
  • 2005-10-05 EP EP05797103A patent/EP1814670A1/de not_active Withdrawn
  • 2005-10-05 WO PCT/EP2005/010698 patent/WO2006056263A1/de active Application Filing
  • 2005-10-05 CN CNB2005800403586A patent/CN100528371C/zh not_active Expired - Fee Related

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