EP0886546A1 - Procede et dispositif pour recouvrir des objets avec des types de produits de recouvrement qui changent souvent - Google Patents

Procede et dispositif pour recouvrir des objets avec des types de produits de recouvrement qui changent souvent

Info

Publication number
EP0886546A1
EP0886546A1 EP96942228A EP96942228A EP0886546A1 EP 0886546 A1 EP0886546 A1 EP 0886546A1 EP 96942228 A EP96942228 A EP 96942228A EP 96942228 A EP96942228 A EP 96942228A EP 0886546 A1 EP0886546 A1 EP 0886546A1
Authority
EP
European Patent Office
Prior art keywords
hollow needle
needle valve
valve
paint
magazine
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.)
Withdrawn
Application number
EP96942228A
Other languages
German (de)
English (en)
Inventor
Christian Aeberhard
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.)
Ingenieurbuero Inovac
Original Assignee
Ingenieurbuero Inovac
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 Ingenieurbuero Inovac filed Critical Ingenieurbuero Inovac
Publication of EP0886546A1 publication Critical patent/EP0886546A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • B05B1/3066—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice the valve element being at least partially hollow and liquid passing through it when the valve is opened
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • 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
    • B05B12/1409—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 the selection means being part of the discharge apparatus, e.g. part of the spray gun
    • 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
    • B05B12/1472—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 separate supply lines supplying different materials to separate outlets of the spraying apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
    • B29C67/246—Moulding high reactive monomers or prepolymers, e.g. by reaction injection moulding [RIM], liquid injection moulding [LIM]

Definitions

  • the invention relates to a method for coating objects with frequently changing types of coating media according to the preamble of patent claim 1 and a device according to the preamble of patent claim 4.
  • a paint circulation device known from German patent application DE 3 130 096, uses two switchover valve arrangements. These are, by relatively longer Supply lines separated, connected to the actual spraying device. This separation or long hoses result in a very high loss of paint and rinsing liquid when the feed lines and the spray device are rinsed.
  • a further disadvantage of these devices is the limitation of the number of colors (e.g. a maximum of 18) which can be installed in the drum-shaped valve devices for reasons of space.
  • a paint circulation system which has a ring line for each individual color, to which a circulation line is assigned, which extends into the vicinity of the spray device.
  • Each circulation line has a color valve there. This means that short supply lines between the paint valve and the spraying device can be implemented, but only in the case of a single paint. In the case of several colors, an additional circulation line and pump are necessary, which means that cleaning them again leads to increased losses as in the systems already mentioned.
  • German patent application DE 4 329 101 is provided with a color change system, which admittedly permits a greater number of colors than the aforementioned devices.
  • a color change system which admittedly permits a greater number of colors than the aforementioned devices.
  • the structural design also does not permit installation in the immediate vicinity of the spray device.
  • the disadvantages of the high losses of dye and detergent are also present here.
  • An atomizer device known from German patent application DE 4 330 602, has a plurality of color channels which run parallel to the axis of an atomizer head and into the spray device in this way integrated that their end openings extend as nozzles into the area of the atomizer head.
  • the paint valves assigned to the paint channels for interrupting the paint flow in the channels are outside the spray device.
  • a disadvantage of this atomizing device is that the lack of valves in the area of the channel ends (nozzles) poses a risk of mixing colors, in particular if detergent is used to dissolve the paint or color residues present in the channel ends. The proposed solution by sucking paint back into the channel does not remedy this deficiency.
  • the known methods and devices include complicated constructions which cause large losses of dyeing and rinsing media and which require more time to be used in the course of the spraying process. This is particularly disadvantageous in fully automated coating systems in the automotive industry. In addition, the environment is polluted with excessive emissions. O 97/24189 pc ⁇ / CH96 / 00458
  • the present invention is therefore based on the object of proposing a method for coating objects with frequently changing types of coating media which overcomes these disadvantages. Likewise, a device for carrying out the method is to be proposed.
  • the effective color change is first carried out immediately before atomization in the paint applicator. Since a separate hollow needle valve is used for each color, which is exchanged in succession in one and the same paint application device, and each hollow needle valve contains the valve systems necessary for the color closure, cleaning is limited only to that between the hollow needle valve and the surfaces of the paint application device immediately surrounding it .
  • the device according to the invention has the advantage that the color volume in the lines to be washed away during a color change is reduced to an absolute minimum.
  • the loss of paint quantity will therefore be less than 2 cm3 with each color change. This is approximately 80 to 100 times less than with conventional systems.
  • a smaller volume of flushing medium is therefore also required, as a result of which the overall loss rates are significantly reduced.
  • the smaller flush volume also significantly increases the flush quality, i.e. the risk of color spreading is reduced to a minimum. This then leads to better coating qualities.
  • valve systems comparable with known color change valves are integrated directly in the movable hollow needle valve.
  • Another advantage is the shorter time required. If the time in known devices is approx. L ⁇ to 25 seconds, the main part being used for rinsing and pressing on the new paint, it is still approx. 8 to 9 seconds in the method and device according to the invention the effort for the motion sequences, ie including the handling of the hollow needle valves to be changed, approx. 5 to 6 seconds
  • Another advantage is that no switching element and no color line section are contacted with a different color from the paint supply to the atomizer device.
  • the color cycle is guaranteed from the color ring line right up to the atomizer device. This prevents segregation of the color media as a result of stationary color streams.
  • the device according to the invention with a ring cassette magazine offers particular advantages.
  • the hoses connected to the hollow needle valves are moved only slightly, thereby reducing wear on them.
  • the device according to the invention can, due to slight modification, be used on all types of paint applicators available on the market, such as electrostatic high-speed rotary atomizers, air atomizer guns, HLVP guns, airless and air mix guns. Furthermore, it is possible to use the device in a non-automated paint shop.
  • Fig.l a hollow needle valve in longitudinal section
  • FIG. 2 shows a hollow needle valve according to FIG. 1 installed in a rotary atomizer
  • FIG. 3 shows a hollow needle valve according to FIG. 1 installed in an air atomizer
  • FIG. 6 shows a handling device according to FIG. 4 in side elevation
  • 7 shows a perspective view of an ink application device with a coated ink application device and revolver magazine
  • FIG. 8 shows a perspective view of an ink application device with a coated ink application device and flat cassette magazine
  • FIG. 9 shows a perspective view of an ink application device with a coated ink application device and a pivotable ring cassette magazine
  • FIG. 11 shows a cross section through a hollow needle valve along the line XI - XI in FIG.
  • FIG. 12 shows a perspective view of an ink application device with a coated ink application device and a fixed ring cassette magazine.
  • a hollow needle valve 81 consisting of a hollow needle valve sleeve 1 with a front end 82, a central region 90 and a rear end 83. From the central region 90 to the front end 82, the hollow needle valve sleeve 1 has an approximately cylindrical outside - Sheath 93.
  • the hollow needle valve sleeve 1 has a bore 85 which extends from the rear end 83 to approximately the front end 82, where a valve chamber 86 is formed, the diameter of which is larger than the bore 85.
  • a further valve chamber 23 connects to the valve chamber 86 coaxially to an axis 11 ⁇ with a larger diameter.
  • a valve seat 20 is formed between the valve chambers 23 and 86.
  • the valve chamber 23 is closed at the end 82 of the hollow needle valve sleeve 1 by a sleeve part 84.
  • the latter has a coaxial valve cone system with an outer sealing cone 3 and an inner sealing cone 4 which projects into the valve chamber 23.
  • the sleeve part 84 has an opening 24. This is connected on the one hand via obliquely arranged bores 87 to the valve chamber 23 and on the other hand via bores 88 to a hollow shaft chamber 25 (described below).
  • the sleeve part 84 is shown schematically firmly connected to the outer jacket 93, i.e. out of one piece.
  • the sleeve part 84 and thus the sealing cones 3 and 4 can advantageously be made as separate pieces and connected to the outer jacket 93 by means not shown.
  • the outer casing 93 is provided with two collecting grooves 14 and 15.
  • the collecting groove 14 is connected to the bore 85 by bores 91.
  • a spiral groove 13 extends from the bores 91 to the front end of the bore 85 therein.
  • a groove-shaped spiral run 16 extends from the collecting groove 15 on the outer casing 93 to its end in the region of the sleeve part 84 or spiral runs can be provided.
  • Grooves in the outer jacket 93 are provided on the one hand between the collecting grooves 14 and 15 and on the other outside the collecting groove 14, for receiving sealing rings 92 and 94.
  • Another Groove, outside the area of the spiral groove 13, is provided in the bore 85 for receiving a sealing ring 95.
  • the hollow needle valve sleeve 1 has a retaining groove 18 on the circumference, into which a tensioning device 17, which is only shown schematically with dash-dotted lines, can engage.
  • the bore 85 has an internal thread 96 in the area of the rear end 83 for receiving a threaded spindle 5.
  • the latter is part of a paint tube 2, which further consists of a cylindrical extension 98, a tubular part 97 and a valve head 99.
  • the color tube 2 or the parts 98, 5, 97 and 99 are shown schematically firmly connected to one another in the example shown, i.e. out of one piece. For manufacturing and assembly reasons, however, these can consist of several individual parts connected by means not shown.
  • the tubular part 97 of the paint tube 2 is displaceable in the direction of the axis 115 in the bore 85.
  • the seal 95 serves to seal the displacement space between part 97 and the hollow needle valve sleeve 1.
  • the valve head 99 is arranged in the valve chamber 23 and has a smaller diameter than the same , but a larger diameter than the part 97.
  • a valve cone 100 is formed between part 97 and valve head 99 and can be brought into contact with valve seat 20 by mutual displacement of parts 1 and 2.
  • a bore 101 and a shoulder 102 in the valve head 99 together form a valve seat 19. The same can be brought into contact with the inner sealing cone 4 by relative displacement of the parts 1 and 2.
  • the tubular part 97 has a bore 103 which extends from the shoulder 98 into the valve head 99.
  • a separating web 8 (FIG. 11) with wedge-shaped ends is inserted in a sealing manner in wedge-shaped grooves 104 of the bore 103.
  • the insertion does not take place as far as the bottom of the bore, so that an intermediate space 107 is formed which connects the chambers 105 and 106.
  • a paint connection head 6 is screwed onto the threaded spindle 5 and by means not shown ⁇ e.g. Set screw) connected to it in a torsion-proof manner.
  • a seal 108 seals the paint tube 2 from the paint connection head 6 on the shoulder 98.
  • the separating web 8 penetrates with a wedge-shaped end 109 into the paint connection head 6.
  • the latter has a connection 7 and a color return connection 10, which in turn are connected to the chambers 105 and 106 via bores 110 and 111.
  • a pair of pliers 26, which is only indicated, can be non-positively connected to the paint connection head 6 by means not shown in FIG. 1.
  • a torsion spring 9 is fastened on the one hand in the paint connection head 6 and on the other hand in the hollow needle valve sleeve 1.
  • a hue application device 11 is indicated in FIG. 1. This has a rear device part 113 and a front device part 114, which can be displaced relative to one another in the direction not shown in the direction of the axis 115.
  • Compression spring 36 between parts 113 and 114 causes them to be pressed against one another in the direction of arrows 121 and 122.
  • Ink applicator 11 is provided with an approximately hollow cylindrical insertion opening 112, into which hollow needle valve sleeve 1 can be inserted. The insertion path is limited by a cone 31 at the rear end 83 of the hollow needle valve sleeve 1 by the cone 31 making a frictional contact with a conical bore 32 in the rear part 113 of the device.
  • the sealing rings 92 and 94 seal against the inner wall of the insertion opening 112.
  • the insertion opening 112 ends in a surface 116.
  • a bore 117 connects to the surface 116 and forms with it a valve seat 118, which in turn can be brought into contact with the outer sealing cone 3 by sliding the device parts 113 and 114 against one another.
  • a hollow shaft chamber 25 is formed between the surface 116 and the sleeve part 84 and is connected to the bores 88 and 117.
  • the end of the bore 117 ends in a schematically illustrated atomizer nozzle 12.
  • Lines 119 and 120 are provided in the front device part 114.
  • the line 119 is connected on the one hand to a flushing valve 21 and on the other hand to the collecting groove 14.
  • the line 120 is connected on the one hand to a return valve 22 and on the other hand to the collecting groove 15. 14
  • the hollow needle valve 81 represents an exchange unit which is used in the color change system according to the invention in a paint application device which is equipped with an appropriately provided insertion opening 112.
  • the hollow needle valve sleeve 1 serves as a valve housing and at the same time as the main needle, the sealing cone 3 of which blocks or opens the bore 117 located in front of the atomizing nozzle 12 and thus supplies the atomizing nozzle 12 with paint or flushing medium.
  • the lifting movement of the hollow needle valve sleeve 1, respectively. of the sealing cone 3 is produced with a handling device explained in more detail below in FIG. 4.
  • the compression spring 36 in the direction of arrow 122 generates the necessary contact pressure between the sealing cone 3 and valve seat 118 and thus closes this passage.
  • Each hollow needle valve 81 used in the color change system according to the invention is supplied with one and the same color.
  • the connection 7 is connected via a hose (not shown) to an ink metering device which generates a constant color flow which, when the valve system 19, 4 is closed, within the hollow needle valve 81 from the connection 7 via bore 110, chamber 105, intermediate space 107, chamber 106 and bore 111 to the color return connection 10 follows.
  • the color cycle is thus up to immediately before the sealing cone 3 acting as the main needle or the atomizer nozzle 12 guaranteed.
  • valve system 19, 4 is always and automatically closed in order to hermetically shut off the paint.
  • valve system 19, 4 and thus the pressure of the sealing cone 3 on the valve seat 19, is closed by the torsion spring 9. This rotates the paint connection head 6 and thus the paint tube 2 connected to it clockwise and moves it through the threaded spindle 5 relative to the hollow needle valve sleeve 1 until the sealing cone 4 comes into contact with the valve seat 19 and the bore 101 is closed.
  • valve system 19, 4 is closed, the valve system 20, 100 is open.
  • flushing agent enters the valve chamber 86 via the flushing valve 21, line 119, collecting groove 14, bore 19 and spiral groove 13, and from there via the valve system 20, 100 into the valve chamber 23. This is cleaned, the flushing agent continuing passes through the bores 87, the opening 24 and the bores 88 into the hollow shaft chamber 25. This is rinsed through and also cleaned.
  • the valve system 3, 118 is closed, the detergent is expelled outside the hollow needle valve sleeve 1 through the spiral barrels 16 to the rear of the collecting groove 15 and through the open return valve 22.
  • the paint connection head 6 For the pre-closure, i.e. To open the valve system 4, 19 or to close the valve system 20, 100, the paint connection head 6 is rotated counterclockwise by means of the pliers 26. The hollow needle valve sleeve 1 is held by the tensioning device 17. With the paint connection head 6, the threaded spindle 5 is simultaneously rotated against the force of the torsion spring 9. The threaded spindle 5 unscrews from the internal thread 96 and causes an axial movement of the paint tube 2 relative to the hollow needle valve sleeve 1. This closes the valve system 20, 100 and the inflow of Detergent interrupted.
  • the paint can now pass unhindered from the chamber 105 through the bore 101, valve system 4, 19 into the valve chamber 23 and through the bores 87, opening 24, bores 88, hollow shaft chamber 25, and valve system 3, 118 into the bore 117 and thus to the atomizer nozzle 12 .
  • FIG. 2 shows an ink application device 28 which has the shape of a rotary atomizer.
  • the same functional parts as used in FIG. 1 are used in some cases.
  • a hollow shaft 30 is installed in the paint applicator 28. It has a bore 123, which forms a front, first part of the insertion opening for the hollow needle valve 81 designed as a unit, as described in FIG. The latter is only partially shown in section.
  • a housing 37 is firmly connected to the paint applicator 28 and the hollow shaft 30 in a manner not shown in detail. The housing
  • the annular piston 33 is connected to a flange 127 which has the conical bore 32 for receiving the cone 31 centrally.
  • a spring sleeve is on an external thread 131
  • Protrusions 132 and 133 serve as abutments of the compression spring 36. The latter causes a relative movement in the direction of the arrows 121 and 122 between the housing 37 and the spring sleeve 38.
  • a spring-loaded pawl 34 is connected to the flange 127 in a manner not shown, that it is radially displaceable and comes into contact with the cone 31 or the holding groove 18, the hollow needle valve 81 being locked axially and non-rotatably relative to the ink application device 28 in its inserted position.
  • the pressure chamber 125 is connected via a bore 134 in the housing 37 and a line 135 to an outside control valve 35 which is shown schematically.
  • the collecting groove 14 is connected to the flushing valve 21 via a bore 136 and the line 119.
  • the collecting groove 15 is connected to the return valve 22 via a bore 137 and the line 120.
  • the ink application device 28 is connected to a schematically illustrated bell plate 137. This includes the bore 117 facing the end of the sealing cone 3. This is connected via a bore 138 and a chamber 40 to an atomizer device 39.
  • a changeover valve 139 is installed in line 119, which is controlled accordingly, either the flushing medium from the flushing valve 21 or compressed air from a blow-out valve 77 allows the inflow into the line 119.
  • the hollow needle valve 81 is inserted into the paint application device 28 as described in FIG. 1 by means of the tensioning device 17.
  • the paint application device 28 is held in place in a spray device (not shown).
  • the mode of operation of the valve systems 3, 118 and 4, 19 and 20, 100 and the relative movements between the hollow needle valve sleeve 1 and the color tube 2 by means of the compression spring 36 and the torsion spring 9 are also the same, as described in FIG. 1.
  • the annular piston 33 Before each insertion or The removal process must be switched on via the control valve 35 compressed air to the pressure chamber 125 so that the annular piston 33 is pressurized with compressed air and moves against the spring force of the compression spring 36 in the direction of arrow 122.
  • the power requirement can be preselected by means of a greater or lesser prestress of the compression spring 36 by means of the spring sleeve 38.
  • the annular piston 33 causes the built-in hollow needle valve 81 and 81 to be raised and lowered. an opening or closing of the sealing cone 3 and thus a connection or disconnection of the ink supply or the flushing medium supply to the bell plate 137 according to the manner described in Fig.l.
  • the purging medium still located in the valve chamber 23, opening 24, hollow shaft chamber 25 and chamber 40 is blown out with compressed air.
  • the blow-out air flows in advance from the blow-out valve 77 via the shuttle valve 139, the line 119, the bore 136, the collecting groove 14, the bore 91 and the spiral groove 13 into the valve chamber 23.
  • FIG. 3 shows a paint application device 41 which has the shape of an air atomizing spray gun or so-called HLVP gun. Some of the same functional parts as in FIGS. 1 and 2 are used.
  • the insertion opening 112 serves to receive the hollow needle valve 81 designed as a unit, as described in FIG. 1.
  • the paint application device 41 has a gun body 140 which contains the functional parts and lines according to FIG. 2. In addition, there is a supply line 141 for the atomizing air. 20th
  • FIGS. 4, 5 and 6 show a possible variant of a handling device 142 for hollow needle valves 81 with revolver magazine.
  • a plurality of hollow needle valves 81 are removably mounted in a magazine 42.
  • the number corresponds e.g. the colors required for application in a spraying line of an automobile plant, including any reserves.
  • the number of twenty-four shown is exemplary and can be adapted to the necessary requirements by enlarging the magazine accordingly.
  • the magazine 42 consists of a magazine body 147 and a hollow cylindrical magazine drum 148 connected to it.
  • the magazine body 147 is rotatably mounted on a central bearing axis 53 by means of roller bearings 44.
  • the latter is fastened in a rotationally fixed manner to a connecting part 43, which is firmly connected to a paint applicator 28 according to FIG. 2.
  • the connecting part 43 is at the same time a structural unit of the entire handling device 142 and also carries a motor 45 with a drive wheel 144.
  • the latter is part of an enveloping drive 46 which is connected to a drive wheel 145 which is fixedly connected to the magazine body 147.
  • a stepper, servo or pneumatic motor can be used as the motor 45.
  • Markings 49 are made on the underside of the magazine body 147. One is assigned to each hollow needle valve 81. An optical or inductive signal generator 48 is arranged on the connecting part 43 such that it Markings 49 can recognize. Recesses 146 are also provided on the underside of the magazine body 147. One is assigned to each hollow needle valve 81. A locking mechanism 50 attached to the connecting part 43 engages in the recesses 146.
  • Each hollow needle valve 81 is a form-fitting holder
  • the form-fitting holder 51 serves as a clear position definition and the force-fitting holder for the static determination of the hollow needle valve receptacle.
  • the bearing axis 53 carries an ejection unit 54 at the upper end.
  • This consists of a bearing body 143, a longitudinal guide part 55, which guides an ejector 56, and a pneumatic cylinder 57, which gives the ejector 56 a reciprocating movement.
  • the ejector 56 is designed with two arms, with an upper arm 149 and a lower arm 150.
  • the magazine drum 148 has between the holders 51,
  • each hollow needle valve 52 of each hollow needle valve has an opening 151 which can be penetrated by the forearm 150 during the back and forth movement.
  • a guide frame 64 is built on the connecting part 43 (FIG. 6) and serves to support an upper spindle bearing 65 and a spindle motor 62.
  • a spindle 61 is rotatably arranged on the one hand in the connecting part 43 and on the other hand in the spindle bearing 65.
  • a second spindle 161 is also rotatably supported on the one hand in the connecting part 43 and is on the other hand connected to the spindle motor 62 in a rotationally fixed manner. Each spindle 61, 161 rotates in a spindle nut 60, which is fastened on a yoke plate 59 22
  • the two lifting spindles 61, 161 are driven by the spindle motor 62 via an enveloping drive 63, the yoke plate 59 depending on the direction of rotation of the spindle motor moving downwards or upwards in the direction of the arrow 152.
  • the clamping device 17 is firmly connected to the yoke plate 59. This has two clamping jaws 153 which can be actuated simultaneously by means of cylinders 154. The actuation is preferably pneumatic. The clamping jaws 153 engage in the holding groove 18 of the hollow needle valve 81.
  • the pliers 26 (FIG. 6), which causes the valve system 4, 19 to open and close, are likewise located on the yoke plate 59 and are actuated by pneumatic or electrical means, not shown.
  • the entire assembly parts mentioned are advantageously integrated in a common housing 66 and thus form a paint application device to be considered as a unit. As a result, wear or leak particles are retained in relation to the environment.
  • the housing 66 serves not to influence the spray booth air flow and also to protect all components of the handling device 142 and the magazine 42 from paint mist.
  • the handling device 142 has the task of removing one in a specific and individual order from the hollow needle valves 81 stored in the magazine 42 and inserting the same into the inking device 28 or 41 that is firmly connected to the handling device 142.
  • the motor 45 rotates to the right or left, so that the rotation path of the magazine 42 is at most half a revolution. This is also necessary in order not to cause any twisting of the paint hoses connected to the individual hollow needle valves 81 or their paint connection heads 6 (not shown in FIGS. 4 to 6).
  • the hollow needle valve 81 to be removed is rotated into a removal position 47 (FIG. 5).
  • the signal transmitter 48 is responsible for the position determination and for the positioning.
  • the removal position 47 approached can be mechanically locked with the locking mechanism 50 if necessary.
  • the ejection unit 54 is responsible for bringing the hollow needle valve 81, which is in the removal position 47, into a lowering position 58 (shown in dash-dot lines in FIG. 4). In this lowering position 58, the hollow needle valve 81 is centered on the axis 151 of the ink application device 28 underneath and thus of the insertion opening 112 (FIG. 1).
  • the stroke of the ejection unit 54 is constant and is ensured in its end positions by fixed stops (not shown in more detail) in the pneumatic cylinder 57.
  • the upper arm 149 encompasses the hollow needle valve 81 in a form-fitting manner
  • the lower arm 150 encompasses it in a force-fitting manner.
  • the clamping device 17 is in turn, shifted in height by means of the spindle motor 62 via the enveloping drive 63 Spindles 61, 161 and the yoke plate 59, in the height position that their previously extended clamping jaws 153 are at the same height as the holding groove 18.
  • the cylinders 154 are activated in such a way that the Insert the clamping jaws 153 into the retaining groove 18 of the hollow needle valve 81 until they are form-fitting and firmly clamp the latter.
  • the pneumatic cylinder 57 of the ejection unit 54 is then activated such that the ejector 56 withdraws.
  • the spindle spindles 61, 161 are now driven by the spindle motor 62 in such a way that the clamped hollow needle valve 81 is displaced in the direction of arrow 155 against the inking device 28 and is inserted into its insertion opening 121 (FIG. 1) or into the bores 123, 124 (FIG. 2) . If the hollow needle valve 81 is in contact with the cone 31 and the pawl 34 holds the same, the cylinders 154 of the clamping device 17 are activated in such a way that the clamping jaws 153 loosen and extend.
  • the spraying process takes place in this position, as has already been described in FIG. 1.
  • the yoke plate 59 and thus the tensioning device 17 remain in this position until the hollow needle valve 81 is subsequently removed from the ink application device 28.
  • FIG. 7 to 9 and 12 show perspective schematic overall representations of ink application devices constructed as a unit, consisting of ink application device 28, magazine device 165 and handling device 142.
  • These ink application devices are shown with different variants of arrangements of the magazines for the hollow needle valves 81, each only schematic exterior views of the cladding, ie the housing 66 are drawn. These have different geometrical shapes 66, 66a, 66b and 66c, corresponding to the magazine shapes indicated as indicated.
  • the axes (Fig.l) of paint applicators 28 are designated, which can be designed according to Fig. 2 or 3.
  • the variant according to FIG. 7 uses a revolver-shaped magazine 42, as was described in FIGS. 4 to 6.
  • the hollow needle valve 81 selected for replacement is brought into the removal position 47 by the magazine 42 which swings back and forth by 180 * .
  • the ejection then takes place, in the direction of arrow 156, into the lowering position 58 and from there the insertion, in the direction of arrow 157, into the inking device 28.
  • the axes of the hollow needle valve 81 in the removal position 47 or lowering position 58 are parallel and eccentric to each other.
  • the variant according to FIG. 8 uses a flat cassette magazine 67, in which the hollow needle valves 81 are magazined parallel to one another.
  • the hollow needle valve 81 selected for the replacement is moved in the direction of the arrows 158 by transversely displacing the flat cassette magazine 67 Removal position 47 brought.
  • the ejection and insertion into the ink application device 28 then takes place as in FIG. 7.
  • the axes of the hollow needle valve 81 in the removal position 47 or lowering position 58 are here also parallel and eccentric to one another.
  • FIG. 9 shows a pivotable ring cassette magazine 68, in which the hollow needle valves 81 are magazined concentrically to the axis 115 of the ink application device 28.
  • the hollow needle valve 81 selected for replacement is brought into the removal position 47 by the ring cassette magazine 68 which swings back and forth by 180 * .
  • the ejection then takes place, in the direction of arrow 156, in the lowering position 58 and from there the insertion, in the direction of arrow 157, into the paint applicator 28.
  • the axes of the standing in the removal position 47 or lowering position 58 Hollow needle valve 81 are parallel and eccentric to each other.
  • a further variant according to FIG. 12 is similar to that in FIG. 9, however, with a fixed ring cassette magazine 159, in which the hollow needle valves 81 are maganized concentrically to the axis 115 of the ink application device 28.
  • a slide-in device 160 which is only hinted at, surrounds the ring cassette magazine 159.
  • a slide 162 which rotates therein encircles the ring cassette magazine 159 until it has reached the hollow needle valve 81 selected for replacement. It is then ejected, in the direction of arrow 163, into the lowering position 58 and from there inserted, in the direction of arrow 157, into the inking device 28.
  • the axes of the standing position in the removal position 47 or lowering position 58 Hollow needle valve 81 are parallel and eccentric to each other.
  • each individual ink type has a separate ink supply line with a constant medium circuit, a so-called ink ring line 164.
  • ink ring line 164 For the sake of simplicity, only five colors a to e are shown here.
  • the effective number of colors n corresponds to that which is necessary for a spray line, e.g. twenty-four or thirty-two.
  • the aggregate parts assigned to a specific color are each designated with the corresponding additional letters a to e.
  • Each color ring line 164 is assigned a separate circulation pump 69, which takes the color medium from a work container 70, which is also separate for each color.
  • a circulation pump 69 takes the color medium from a work container 70, which is also separate for each color.
  • the circulation pump 69a and working container 70a belonging to color a is shown schematically.
  • the color ring lines 164 feed all of the bodywork spraying lines or paint applicators present in an automobile plant. Only one paint applicator 28 is shown in FIG. 10. Each ink application device 28 is connected to the color ring line 164 via a ring line tap 71. Thus, on a color ring line 164a all hollow needle valves 81a are connected with the same color assignment a. Color feed lines 72 are connected to the ring line tap 71. In order for the paint flow rate at the atomizing nozzles in the paint applicator 28 to give constant values, the medium pressures or the flow rates in the paint feed lines 72a to 72n must also have constant values. For this reason, metering devices 73 are necessary which are installed in the ink feed lines 72. A separate control device 73a to 73n is assigned to each color a to n in order to control the required pressure and or flow.
  • a magazine device 165 is equipped with the hollow needle valves 81.
  • the type of magazine can be designed according to that of FIGS. 7 to 9 or 12.
  • Each hollow needle valve 81 is reconnected to the color ring line 164 via a color return line 74, a color return valve 75 and a return tap 80.
  • the ink application device 28 is connected to a main flushing medium line 79 via the line 119 and the flushing valve 21.
  • the blow-out valve 77 connects a compressed air source 166 to the line 119 via a check valve 78.
  • the line 120 connects the paint application device 28 via the return valve 22 to a collecting line 76 for returning used and contaminated flushing medium.
  • a hollow needle valve 81a is used in the paint applicator 28 by the handling device 142 (not shown here) (FIGS. 4 to 6). If this does not have a spray function at the moment, its valve systems 4, 19 and 3, 118 are closed. In the process, the color a likewise flows, with the color return valve 75 open, from the hollow needle valve 81a back into the color ring line 164a. If the paint application device 28 is in a spraying function, the valve systems 4, 19 and 3, 118 are opened, and the color return valve 75 is closed. The paint a now penetrates to the atomizer device of the paint applicator 28.
  • the pre-shut-off valve system 4, 19 of the hollow needle valve 81a closes, as described in FIG. 1.
  • the flushing valve 21 By opening the flushing valve 21, the nozzle cavities and the atomizing devices are flushed and the flushing medium occurs when the valve is open Main needle valve system 3,118 into the open and with closed valve system 3,118 and open return valve 22 back into the collecting line 76.
  • the check valve 78 prevents the flushing medium from penetrating into the compressed air system or into the blow-out valve 77.
  • the flushed surfaces of the inner parts of the hollow needle valve 81a must be blown dry with compressed air. This takes place after the flushing valve 21 has been closed by opening the blow-out valve 77.
  • the hollow needle valve 81a can be exchanged for such a different color by means of the handling device 142.

Landscapes

  • Spray Control Apparatus (AREA)
  • Nozzles (AREA)

Abstract

Selon un procédé permettant de recouvrir des objets avec des types de produits de recouvrement qui changent souvent, on prélève lesdits produits de réservoirs de travail et on les amène sous agitation constante aux conduits annulaires de peinture. Les produits sont ensuite sélectivement amenés des conduits annulaires à une soupape à aiguille creuse dans un applicateur de peinture pourvu d'un dispositif de pulvérisation et directement amenés dans la soupape à aiguille creuse jusqu'au dispositif de pulvérisation. Chaque type de produit est toujours amené à la même soupape à aiguille creuse (81), soupape qui lui est affectée. Lorsque le produit est changé, on enlève la soupape à aiguille creuse (81a) de l'applicateur de peinture (28) au moyen d'un manipulateur et on la remplace par une autre soupape à aiguille creuse (81b) qui correspond au produit suivant. Les soupapes à aiguille creuse qui ne sont pas montées dans l'applicateur de peinture sont conservées dans un magasin (165).
EP96942228A 1995-12-29 1996-12-23 Procede et dispositif pour recouvrir des objets avec des types de produits de recouvrement qui changent souvent Withdrawn EP0886546A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH369795 1995-12-29
CH3697/95 1995-12-29
PCT/CH1996/000458 WO1997024189A1 (fr) 1995-12-29 1996-12-23 Procede et dispositif pour recouvrir des objets avec des types de produits de recouvrement qui changent souvent

Publications (1)

Publication Number Publication Date
EP0886546A1 true EP0886546A1 (fr) 1998-12-30

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Application Number Title Priority Date Filing Date
EP96942228A Withdrawn EP0886546A1 (fr) 1995-12-29 1996-12-23 Procede et dispositif pour recouvrir des objets avec des types de produits de recouvrement qui changent souvent

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EP (1) EP0886546A1 (fr)
WO (1) WO1997024189A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1004360B1 (fr) * 1998-06-22 2007-09-19 Abb K.K. Dispositif de peinture
JP4016369B2 (ja) * 1999-02-15 2007-12-05 ノードソン株式会社 導電性塗料の多色静電塗装色替え装置
US6755913B1 (en) 1999-02-15 2004-06-29 Nordson Corporation Multi-color change device with conductive coating material for electrostatic coating
ATE414828T1 (de) * 2002-06-07 2008-12-15 Sicis Int Srl Wand- und/oder bodenfliese sowie verfahren zu ihrer herstellung
DE102012022535A1 (de) 2012-11-16 2014-05-22 Eisenmann Ag Applikator-Anschlusseinheit, Applikationsroboter und Anlage zum Beschichten von Gegenständen

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2257004A (en) * 1938-10-07 1941-09-23 Chrysler Corp Coating material spraying apparatus
JPS6051867B2 (ja) * 1980-08-04 1985-11-15 日本ランズバ−グ株式会社 塗料色替え方法
DE4117613A1 (de) * 1991-05-29 1992-12-03 Ransburg Gmbh Spruehbeschichtungsvorrichtung
JP2830683B2 (ja) * 1992-09-11 1998-12-02 トヨタ自動車株式会社 回転霧化静電塗装装置
DE4329101A1 (de) * 1993-08-30 1995-03-02 Abb Patent Gmbh Wechselsystem für verschiedene Medien
SE504472C2 (sv) * 1995-06-22 1997-02-17 Abb Flexible Automation As Färgmatningssystem för sprutmålningsrobot

Non-Patent Citations (1)

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Title
See references of WO9724189A1 *

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