EP0383030B1 - Sprühbeschichtungsgerät zum elektrostatischen Sprühbeschichten - Google Patents

Sprühbeschichtungsgerät zum elektrostatischen Sprühbeschichten Download PDF

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Publication number
EP0383030B1
EP0383030B1 EP90100823A EP90100823A EP0383030B1 EP 0383030 B1 EP0383030 B1 EP 0383030B1 EP 90100823 A EP90100823 A EP 90100823A EP 90100823 A EP90100823 A EP 90100823A EP 0383030 B1 EP0383030 B1 EP 0383030B1
Authority
EP
European Patent Office
Prior art keywords
duct
gun barrel
channel
electrical
voltage generator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90100823A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0383030A1 (de
Inventor
Karl Buschor
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.)
Gema Switzerland GmbH
Original Assignee
Gema Switzerland GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gema Switzerland GmbH filed Critical Gema Switzerland GmbH
Priority to AT90100823T priority Critical patent/ATE74027T1/de
Publication of EP0383030A1 publication Critical patent/EP0383030A1/de
Application granted granted Critical
Publication of EP0383030B1 publication Critical patent/EP0383030B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • 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
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying
    • B05B5/032—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying for spraying particulate materials
    • 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
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/053—Arrangements for supplying power, e.g. charging power
    • B05B5/0531—Power generators

Definitions

  • the invention relates to a spray coating device for the electrostatic spray coating of objects with coating material according to the preamble of claim 1.
  • spray gun of this type consists of a gun barrel and a carrier attached to its underside in the form of a pistol grip.
  • a straight channel leads to the supply of powdered coating material in the longitudinal direction Atomizer nozzle.
  • a straight plastic tube extends through the channel, which protrudes beyond the channel at the rear and can be connected to a hose for supplying the coating material.
  • a second channel extends parallel to it through the gun barrel. This second channel is closed at the front and can also be closed by a cap at the rear.
  • a voltage multiplier cascade, a transformer, and an oscillator can be introduced in succession in the second channel, each of which is designed as a module and is connected to one another by electrical plugs when the modules are plugged into the second channel.
  • a channel runs through the pistol grip from bottom to top, through which electrical connecting lines of a voltage supply cable are led, which protrude from the top of the pistol grip and are connected to a plug-in plate which can be plugged onto the plug of the module last used.
  • the pistol grip can be unscrewed and the pistol barrel can then be attached to a machine carrier, for example a robot, without a pistol grip.
  • Spray guns are known from US Pat. Nos. 3,617,000, 3,777,981 and 3,844,477, in which the fluid line consists of a flexible hose which extends from a source of coating powder to the spray gun and through it to an atomizing nozzle.
  • DE-PS 34 02 945 shows a voltage multiplier cascade, on the secondary side of which electrodes for the electrostatic charging of coating material are connected.
  • a lamp indicates the electrical voltage of the electrodes.
  • EP-PS 0 164 837 B1 shows a spray gun for liquid coating material with a valve needle in a channel leading through the gun barrel. The valve needle is actuated by a trigger and interacts with a valve seat located directly in front of the atomizing nozzle.
  • a voltage multiplier cascade is used to generate a high voltage for electrodes for electrostatically charging the liquid coating material.
  • EP-PS 0 110 753 B1 shows an electrostatic powder spray gun in which a handle is adjacent to an overall flat back of a gun barrel. There is a transformer in the handle and a voltage multiplier is cast into the material of the gun barrel.
  • the aim of the invention is to achieve the object of designing the spray gun in such a way that it can be manufactured, cleaned, serviced and repaired more easily and that important elements can be replaced simply and quickly.
  • Such an exchange of elements should not only shorten operational downtimes for defective elements, but also enable the spray gun to be converted from one atomizer system to another atomizer system, as is known, for example, from DE-OS 36 08 415.
  • the invention is also intended it is possible to change the polarity of the high voltage from normally "minus" to "plus”, which is required, for example, for coating powder made of polyamide.
  • the invention achieves a substantial reduction in the number of channels in the barrel and also in the pistol grip.
  • the pistol barrel and the pistol grip each consist essentially of a plastic body, which are produced by injection molding. If the tool cores required for producing the channels in the plastic bodies are long and thin, there is a risk that they will bend during the injection molding process and thereby the channels be deformed. This disadvantage is avoided according to the invention.
  • the invention makes it possible to maintain constant wall thicknesses of the plastic bodies. If there are different wall thicknesses, there is a risk that voids will form during the cooling process after the injection molding process.
  • the high-voltage generator consists of at least one module, which can be replaced quickly and easily.
  • the module is accommodated in the spray gun barrel in a liquid-tight manner, so that the gun barrel can be brought into contact with the high-voltage generator contained therein for the purpose of cleaning with solvent, without the high-voltage generator being damaged.
  • the Plastic body in which the parts of the high voltage generator are cast, can therefore consist of a different plastic than the spray gun barrel, and in particular the plastic body need not be resistant to solvents.
  • the carrier can also be cleaned quickly, since the electrical connection of the low-voltage cable can be connected to the primary-side connection elements of the high-voltage generator by simply pushing it through a rectilinear channel of the carrier. This means that all electrical connections are simple plug connections.
  • the connector of the electrical supply cable only needs to be pulled out of the carrier so that the carrier can then be removed from the spray gun barrel in a simple manner in order to be cleaned.
  • Coating material especially powder
  • Coating material has a strong abrasive effect. Furthermore, it is often desirable to electrostatically charge the powder on the wall of the conduit by friction. Depending on the type of powder, other plastic materials as wall for the line are advantageous.
  • the tube can be exchanged easily and quickly if it is worn out or if it is to be made of a certain plastic or a certain other material or if there is no time available for cleaning the tube when changing colors.
  • the spray gun according to the invention shown in FIGS. 1 to 7 for the electrostatic spray coating of objects with powdered coating material essentially consists of the following parts: a gun barrel 2 made of plastic; an atomizer nozzle 4 made of plastic, the rear annular end face 3 of which can be pressed airtight against the annular front end face 5 at the front end 6 by screwing a screw sleeve 8 made of plastic overlapping the atomizer nozzle 4 onto the threaded end 7 of the gun barrel 2 with a first rectilinear channel 10 aligned with the nozzle opening 12; a high-voltage generator 14, which has the form of a module and can be used interchangeably in a second rectilinear channel 16 from the rear of the device; a carrier in the form of a pistol grip 18; which can be inserted into a cutout 20 formed at the bottom in the pistol barrel 2 and has a grip part 22, the pistol grip 18 and its grip part 22 being made together from one piece of plastic and through the pistol grip 18 a rectilinear
  • the cover cap 30 and its hook 34 are made in one piece from plastic.
  • the parts can be assembled in a simple manner by inserting the lower leg 28 of the tube 26 into the fourth channel 25 of the pistol grip 18 in accordance with an arrow 35, and then the protruding leg 27 of the tube 26 from the rear of the gun into the first channel inserted and thereby the head part 36 of the pistol grip 18 is inserted into the cutout 20 of the pistol barrel 2, corresponding to the arrow 37; the high-voltage generator 14 is inserted into the second channel 16 from the rear of the gun, the high-voltage generator 14 being able to be inserted before or after the pipe 26; then the rear cover cap 30 is attached and fastened with the screw 32; then a rod-shaped electrical connector 40 of a low-voltage supply cable 41 is inserted through the straight third channel 24 in accordance with an arrow 42 and is then rotated through approximately 90 ° in accordance with an arrow 43.
  • electrical connecting contacts 44 at the front end of the rod-shaped connecting piece 40 are automatically pressed onto electrical connecting elements 46, which are cast into an intermediate base 48 of the gun barrel 2.
  • electrical contacts 50 of the primary-side connection of the high-voltage generator 14 rest on the electrical connection elements 46.
  • the electrical contacts 44 and 50 are in the form of resilient pins.
  • the high-voltage generator 14 contains at least one transformer 57 and a voltage multiplier cascade 59 connected to its secondary side, both of which are cast into a block 60 made of plastic, so that the high-voltage generator 14 is a replaceable module.
  • a feed module 90 is attached on the back 88 of the block 60, which is the right end in FIG. 3, a feed module 90 is attached. Electrical contacts 50 protrude from the feed module 90 for the primary-side electrical connection of the high-voltage generator 14.
  • the high-voltage generator 14 forms an interchangeable unit together with the feed module 90.
  • the secondary end of the voltage multiplier cascade 59 is provided with an electrical pin 61.
  • the connecting pin 61 is in electrical connection with an electrode 64, which is located in the atomizer nozzle 4, via an electrical line 62, which passes through the front part 6 of the gun barrel 2, and an annular electrical conductor 63 on the rear end face of the atomizer nozzle 4 for electrostatic charging of the powder Coating material is used.
  • the voltage supply to the electrical connection elements 46 can optionally be switched on or interrupted by a reed contact switch 68, which is magnetically remotely actuated by a trigger 70 on the handle part 22.
  • the rear end of the second channel 16 can be closed tightly so that no liquid, in particular no solvent, can penetrate to the high-voltage generator 14 accommodated in this second channel.
  • the second channel 16 and the unit of high-voltage generator 14 and supply module 90 accommodated therein extend substantially parallel to the first channel 10 arranged underneath, but protrude rearward beyond the first channel because the pistol barrel 2 is at its rear end 72
  • the length is graded so that the cutout 20 is located below the intermediate base 48, the second channel 16 extending above the cutout 20 into an upper rear plane 74, while the first channel 10 lies entirely within the rear plane 75 below, which in FIG Fig. 1 limits the left end of the cutout 20, the upper limit of which is the intermediate floor 48.
  • the first channel 10, which opens into the lower back plane 75, is thus approximately 20% to 50% shorter than if it would extend into the plane of the upper back plane 74.
  • the axial distance 71 between the two rear side planes 74 and 75 corresponds to the upper axial length of the cutout 20 and is between 50% and 300%, preferably approximately 150% of the axial length of the transformer 57. Relative to the high-voltage generator module 14, one can say that the axial distance 71 between 30% and 70%, preferably about 50% of the axial length of the high voltage generator Module 14 is.
  • the front end 6 of the gun barrel 2 provided with the thread 7 is coaxial to the first channel 10 and has only a minimal diameter as large as is required for the thread 7 and the accommodation of the electrical line 62. As a result, the first channel 10 is very short and only a little plastic is required to form the spray gun barrel along this first channel 10. This means that there are no adverse material deformations during manufacture.
  • the lower barrel part, which forms the first channel 10 and the lower rear plane 75 and the front part 6 with the thread 7, is designated by 76.
  • the overlying upper running part 78 extends from the upper rear plane 74 only as far as a front shoulder 80, which tapers towards the front end 6, as is necessary to form the second channel 16 for accommodating the high-voltage generator 14 and its feed module 90.
  • the tube 26 can be constructed in several parts. It is preferably made of plastic.
  • the curved section 29 can be an angle piece, in which tubes are inserted as legs 27 and 28.
  • the connector 40 of the voltage supply cable 41 has a tubular, electrically insulating sheath 82, in which the reed contact switch 68 is accommodated.
  • the trigger 70 moves a rod-shaped magnet 86 relative to the reed contact switch 68 against a spring 84 made of plastic and thereby switches this switch on or off as desired.
  • the tubular or rod-shaped connector 40 extends into a blind hole 89 formed in the intermediate base 48 and thereby prevents the carrier 18 from Gun barrel 2 can be separated as long as the contacts 44 of the connector 40 have the electrical connection elements 46 on the primary side of the high voltage generator 14 connection.
  • the rear end 95 of the rigid connector 40 protrudes from the bottom of the handle part 22 as shown in FIG. 4 so that it can be gripped by hand.
  • the feed module 90 shown in FIG. 3 can be screwed onto the plastic block 60 of the high-voltage generator 14 or cast with plastic.
  • the plastic block 60 can be produced from a plastic which is not resistant to solvents, which is more favorable for casting in the transformer 57 and the high-voltage cascade 59, while the feed module 90 consists of a plastic which is resistant to solvents.
  • the feed module 90 contains a lamp 94 for indicating whether electrical voltage is present on the primary side of the high-voltage generator 14.
  • a seal 92 is located between the feed module 90 and the jacket wall of the second channel 16.
  • an electrically conductive spring 97 and an electrical current-limiting resistor 98 are located in the electrical line 62 between the high-voltage generator 14 and the electrode 64 within a fifth channel 96.
  • the screw 32 of the rear cover cap 30 is screwed into a thread 99 of the intermediate base 48.
  • the screw 32 is made of plastic.
  • a plug connection 100 extending in the longitudinal direction of the gun barrel is formed between the carrier 18 and the gun barrel 2. These two parts are plugged together axially at the plug connection when the pistol grip 18 is inserted into the cutout 20 of the pistol barrel 2 from right to left in accordance with arrow 37 in FIG. 1.
  • 6 is formed by ribs 101 and 102 of the intermediate floor 48 which project transversely from one another, ribs 103 and 104 of the support 18 which overlap these ribs 101 and 102 and wall portions 105 and 106 of the upper running part which project downwards, together with longitudinal outer shoulders 107 and 108 of the pistol grip 18.
  • FIG. 6 and 7 together with FIG. 4 show the bayonet lock 51, 52 and 53 from FIG. 1 in more detail.
  • the projection 51 of the electrical connector 40 can be formed by a screw.
  • the connector 40 can be secured by a further screw 110, which can hold a grounding plate 112 on the back of the handle part 22 at the same time.
  • the high-voltage generator module 14 is offset from the rear end at the lower rear plane 75 of the first channel 10 so far back that at least half the length of the transformer 57, but preferably the entire transformer 57, is above the cutout 20. All parts are made of electrically insulating plastic, with the exception of the electrical components mentioned and a grounding plate 112 on the back of the handle part 22 (FIG. 4).
  • the further embodiment according to the invention shown in side view in FIG. 8 relates to a gun-like spray coating device for electrostatically spray coating objects with liquid coating material, in particular with paint.
  • Parts which are identical or essentially correspond to parts of the previously described embodiment according to the invention are provided with the same reference symbols and the additional number “/ 2”.
  • the main difference is that the straight first channel 10/2 is not supplied with the liquid coating material, normally paint, at the upstream beginning, but via an additional paint line 120 and a paint channel 122 in the front end 6 passing through the lower barrel part 76/2 / 2 upstream of a valve seat 124 formed in the first channel 10/2.
  • a valve needle 126 extends through the first channel 10/2 and cooperates with the valve seat 124 and is actuated by the trigger 70/2.
  • the trigger 70/2 is pivotally connected to the gun barrel 2/2.
  • the high-voltage generator module 14/2 is also here in the second straight channel 16/2, which is located above the first channel 10/2. Only the front half of the length of the second channel 16/2 is located immediately above the first channel 10/2, while the rear half or a third of the second channel 16/2 protrudes rearward beyond the lower channel 10/2, as in FIG is also essentially the case in the embodiment previously described with reference to FIGS. 1 to 7.
  • the electrical connecting piece 40/2 also extends here through the straight third channel 24/2, from which it protrudes somewhat according to FIG. 8 to the outside, so that it can be grasped by hand.
  • the straight fourth channel 25/2 also passes through the carrier 18/2 and its handle 22/2. This fourth channel 25/2 is only required in FIG. 8 if air is to be supplied to atomize the liquid coating material. However, it is known that the liquid coating material can be atomized through the atomizing nozzle 4/2 without the additional use of air.
  • FIG. 9 shows an embodiment of the invention which does not have a grip part 22, but instead has a fastening bracket 130 for fastening the spray coating device to a machine, for example a robot.
  • a fastening bracket 130 for fastening the spray coating device to a machine, for example a robot.
  • the fastening bracket 130 can be an integral extension of the rear cover cap 30/3.
  • the rectilinear first channel 10/3 and the rectilinear second channel 16/3 lying above it, but axially offset from it, for the high-voltage generator module 14/3 and the other parts of the gun barrel 2/3 are essentially of the same design as in the previously described first Embodiment.
  • the rectilinear third channel 24/3 are arranged axially to the second channel 16/3 and the rectilinear fourth channel 25/3 are arranged axially to the first channel 10/3.
  • the electrical connection elements 46/3 on the primary side of the high-voltage generator module 14/3 are not located in the intermediate floor 48/3, but in accordance with FIG. 9 on the rear side of the module 14/3.
  • FIGS. 1 to 7 further elements which are identical or functionally essentially the same as elements of FIGS. 1 to 7 are provided with the same reference numbers as in FIGS. 1 to 7, supplemented by the additional number.
  • FIGS. 1 to 7 of the first embodiment of the invention are given, since the other FIGS. 8 and 9, which contain further embodiments of the invention, have the same reference numbers, only with the additional numbers "/ 2" or "/ 3".

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP90100823A 1989-02-14 1990-01-16 Sprühbeschichtungsgerät zum elektrostatischen Sprühbeschichten Expired - Lifetime EP0383030B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90100823T ATE74027T1 (de) 1989-02-14 1990-01-16 Spruehbeschichtungsgeraet zum elektrostatischen spruehbeschichten.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3904438A DE3904438A1 (de) 1989-02-14 1989-02-14 Spruehbeschichtungsgeraet zum elektrostatischen spruehbeschichten
DE3904438 1989-02-14

Publications (2)

Publication Number Publication Date
EP0383030A1 EP0383030A1 (de) 1990-08-22
EP0383030B1 true EP0383030B1 (de) 1992-03-25

Family

ID=6374070

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90100823A Expired - Lifetime EP0383030B1 (de) 1989-02-14 1990-01-16 Sprühbeschichtungsgerät zum elektrostatischen Sprühbeschichten

Country Status (5)

Country Link
US (1) US4993645A (ja)
EP (1) EP0383030B1 (ja)
JP (1) JPH02241562A (ja)
AT (1) ATE74027T1 (ja)
DE (2) DE3904438A1 (ja)

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Also Published As

Publication number Publication date
JPH0532106B2 (ja) 1993-05-14
US4993645A (en) 1991-02-19
DE59000067D1 (de) 1992-04-30
EP0383030A1 (de) 1990-08-22
ATE74027T1 (de) 1992-04-15
JPH02241562A (ja) 1990-09-26
DE3904438A1 (de) 1990-08-16

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