EP0252954B1 - Elektrostatische pulversprühvorrichtung mit triboelektrischer pulveraufladung - Google Patents

Elektrostatische pulversprühvorrichtung mit triboelektrischer pulveraufladung Download PDF

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Publication number
EP0252954B1
EP0252954B1 EP87900639A EP87900639A EP0252954B1 EP 0252954 B1 EP0252954 B1 EP 0252954B1 EP 87900639 A EP87900639 A EP 87900639A EP 87900639 A EP87900639 A EP 87900639A EP 0252954 B1 EP0252954 B1 EP 0252954B1
Authority
EP
European Patent Office
Prior art keywords
powder
powder pipe
pipe
particles
electrodes
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
Application number
EP87900639A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0252954A1 (de
Inventor
Gerhard Friedrich VÖHRINGER
Kurt Pfeifer
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.)
Esb Elektrostatische Sprueh- und Beschichtungsanlagen Gf Vohringer GmbH
Original Assignee
Esb Elektrostatische Sprueh- und Beschichtungsanlagen Gf Vohringer 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 Esb Elektrostatische Sprueh- und Beschichtungsanlagen Gf Vohringer GmbH filed Critical Esb Elektrostatische Sprueh- und Beschichtungsanlagen Gf Vohringer GmbH
Priority to AT87900639T priority Critical patent/ATE43517T1/de
Publication of EP0252954A1 publication Critical patent/EP0252954A1/de
Application granted granted Critical
Publication of EP0252954B1 publication Critical patent/EP0252954B1/de
Expired 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
    • B05B5/047—Discharge apparatus, e.g. electrostatic spray guns using tribo-charging

Definitions

  • the invention relates to an electrostatic powder spraying device with triboelectric powder charging by means of a powder tube enclosing a conveying channel for the spray powder and at least one displacement body arranged in the flow channel to increase the flow rate, the powder tube being earthed on its outside and having a triboelectric material on at least on its inside the frictional electrical voltage series is arranged at a distance from the material of the powder particles to be sprayed.
  • Such a device is known from DE-B-2 203 351. This device does not require an electric field between the nozzle and the workpiece.
  • a comparable powder spraying device is known from DE-A-2 938 806, according to which the powder is charged in a tubular nozzle body, the flow channel of which is narrowed by a guide body in order to increase the speed and thereby generate a flow vortex.
  • the outside of the nozzle is grounded or connected to high voltage in order to separate the opposite charges of particles in the event of contact on the wall of the nozzle lined with triboelectric material or on the displacement body.
  • This is intended to improve the charging of the particles, but a separate electric field is used between the nozzle and the workpiece to guide the charged particles to the material.
  • the electrostatic field extends to the tips, edges and other protrusions of the workpiece, neutral zones form on the workpiece.
  • the coating powder can therefore only penetrate into corners and cracks of the workpiece to an insufficient extent. The coating therefore becomes uneven, which is a major reason why surface damage such as rust stains or the like occurs early on the coated workpiece.
  • the invention is based on the electrostatic powder spraying device defined at the outset and pursues the task of designing this device in the simplest possible manner in such a way that the precipitation of the coating powder is evened out on workpieces of complicated design and the precipitation efficiency is increased.
  • a reloading device for the triboelectrically charged powder particles with the same polarity adopted in the frictional charging is used to achieve this object.
  • the charging voltage of the powder particles can be increased to such an extent that these particles find their way to the workpiece without an electrostatic guide field, which is set up externally between the spraying device and the workpiece, and largely independently of other directional forces such as gas pressure flow forces and the like.
  • the powder particles can penetrate to the bottom of even complicated recesses on the workpiece, even the coating over the entire surface and improve protection against damage or destruction from the outside.
  • the recharging should primarily be carried out by electrodes fed from an electrical high-voltage line, such as radially inwardly projecting wire electrodes. However, it may be appropriate to carry out a further recharge shortly before the powder emerges from the nozzle, which under certain circumstances can again be done triboelectrically.
  • multiply provided displacement bodies which can be provided in the flow channel, but also in an upstream delivery channel, finally just before the nozzle emerges.
  • the supporting part of the device shown in FIGS. 1 and 2 is a powder tube (1), to which a flow conveying gas with a large number of powder particles uniformly distributed therein is fed from the feed end (2) according to arrow (J), which according to FIG. 1 are shown as positive charge carriers (4) and leave the powder tube (1) at its outlet end (5) again, in order to be guided to a workpiece which is at ground potential, in particular by means of electrostatic charge forces.
  • This discharge body (7) is connected by a line (8) to an earth connection (9).
  • the discharge body (7) expediently consists of highly conductive metal such as copper or brass
  • the powder tube (1) is expediently formed by an insulator, in particular an insulating plastic.
  • Polytetrafluoroethylene (PTFE) is preferred.
  • PTFE polytetrafluoroethylene
  • a particular advantage of this material is the big difference between its electricity constants and those of the most commonly used coating powders, especially epoxy resin.
  • a recharging device (12) which is arranged close to the outlet end (5), is used, for example, with two recharging electrodes (13) designed as wire electrodes, which project approximately radially into the conveying channel delimited by the inner surface (11) and through one high-resistance protective resistor (15) are connected to a high-voltage supply (17).
  • the friction charge is reinforced by two displacement bodies (21) and (22), which, like the powder tube (1), are made of PTFE and bear against the inside (11) of the powder tube with slight pressure.
  • Both displacement bodies each have a core (23) with a square cross section, which carries guide ribs (24) arranged in a cross shape on the outside, which run parallel to the pipe axis (16) with the same circumferential division and are provided with wedge-shaped bevels (25) at the ends of the displacement bodies.
  • the edges (28) of the guide ribs (24) can also be sharpened in a cutting shape on the inflow side (arrow 3).
  • Both displacement bodies (21, 22) are rotated by 45 ° to one another as shown in FIG. 2.
  • Each displacement body reduces the free flow cross-section in the flow channel (14) to less than half the available cross-sectional area.
  • the powder grains can not flow linearly, but are deflected in the circumferential direction and thereby swirled, which brings additional contacts with the boundary surfaces of the displacement body and the powder tube (1). This also takes place at about twice the speed, which significantly increases the effect of friction charging.
  • an axial hollow of the core (23) of the displacement body (21) is a cylindrical metal rod (26) which is connected to the respective displacement body , the powder tube (1) and its grounding body (7) is connected by a radially guided pin (27).
  • This pin serves both to ground the displacement body and to secure it in position. It also serves to form a counter electrode, which includes the grounding body (7) and the metal rod (26).
  • the coating powder which is distributed as evenly as possible in its conveying gas, is blown into the powder tube (1) in the direction of arrow (3) at the feed end (2). Due to the contacts with the inner surface (11) and the displacement bodies (21) and (22), more and more charge particles release their negative charge carrier (10) to the powder tube (1) and the metal body (26) after a division process.
  • the powder is positively charged triboelectrically.
  • This charge is amplified towards the outlet end (5) by the reloading device (12).
  • An electrostatic field is formed between the recharge electrodes (13) and the counterelectrode formed by the parts (7, 26, 27), which causes a charge equalization with the negative charge carriers (10) in accordance with the field lines (18) and at the same time that brings already positively charged charge carriers (4) to a higher charge potential.
  • the endeavor of the positively charged charge carriers (4) to balance the negative charge carriers (10) leads to the entire electrostatic field moving into the flow channel (10). This prevents the field from emerging from the nozzle opening (31) and thus the formation of electrically neutral zones (Faraday cages) on the workpiece. Due to the improved charging of the coating powder, higher powder throughputs can be achieved.
  • the operating voltage on the high-voltage supply (17) can be adapted accordingly to the individual operating conditions, for example to the materials used for the powder tube (1). of the coating powder and also the type and number of displacement bodies used be turned off. It can also be adjusted automatically according to operating data, such as the distance to the workpiece, the percentage of powder deposited, and also according to the current intensity.
  • the powder tube (1) is installed in the shaft (40) of a spray gun (50) within a shaft tube (58) in the manner known from DE-A-2 559 472, which is rotatably fixed between a head piece (52) and a foot piece (47) is held on the front of the gun housing (51).
  • a tubular nozzle bushing (62) is held inside by means of a nozzle sleeve (69), in which the flow channel (14) is widened from a rear cylinder section (30) to an annular nozzle opening (31).
  • An inner collar (32) of the head piece (52) fits smoothly between the powder tube and spray nozzle into the wall of the flow channel (14).
  • a nozzle rod (39) is held in this by means of axially extending radial webs (65) and carries an impact body (67) which is adjustable in length.
  • the recharge electrodes (13) are located at a distance from the nozzle opening (31) in the rear end of the nozzle bushing (62). They are connected in the manner known from the aforementioned DE-A-2 559 472 via a high-resistance protective resistor (75) to the high-voltage feed (17), which is led to the outside in the form of a high-voltage cable at the lower end of the pistol grip (33).
  • a feed channel (34) is provided in the gun handle (33) which, like the powder tube (1) itself, is connected to a bend-like shaped body (35) in the gun housing (51).
  • an injector nozzle (37) opens into the rear extension of the powder tube (1), to which compressed air is fed through a hose (38).
  • the wall of the conveying channel (34) generally consists of the same insulating material as the parts (1, 21 and 22), so that the powder is already charged with friction. Therefore, a displacement body (19) is also attached there, which has essentially the same effects as the displacement bodies (21 and 22).
  • an impact body (671) with its central bore (72) sits on the front end of a tubular nozzle rod (661) which is led out of the back of the gun housing (51) and connected to a compressed gas supply line ( 73) is connected.
  • This nozzle rod can be moved in the direction of the double arrow (74) and the distance of the impact body (671) from the nozzle opening (31) can thus be changed.
  • the compressed air from the bore (72) on the back (78) of the impact body is also radially deflected by a nozzle device (79) and takes the flow impinging on the front (77) at the ring edge (80) in order to prevent powder particles from adhering to the back of the impact body.
  • the nozzle bushing (621) is smooth cylindrical and shortened compared to the previously described embodiment. It is held in the head piece (52) by a nozzle sleeve (691) overlapping this head piece, on which in turn a nozzle cap (70) is seated.
  • the interior (71) formed between the aforementioned parts widens from the flow channel (14) via a first frustoconical surface (41) formed on the end faces of the nozzle bushing (621) and the nozzle sleeve to a cylindrical central space (42) and narrows down to the annular nozzle opening (311) along a truncated cone surface (43).
  • the guide body (44) is provided on its circumferential side with helically arranged or formed guide elements (45), which can be designed as grooves or as ribs, so that in each case helical narrow channels are formed through which the powder flow is passed, the Powder is additionally brought into connection with the guide body (44) and the wall of the nozzle cap (70).
  • the guide body like the nozzle cap (70), is expediently made of triboelectric material such as PTFE in order to open up a further possibility of reloading.
  • a tapered guide insert (46) attached to the end of the guide body (44) serves to introduce it into the screw channels.
  • the powder voltage is initially charged exclusively by friction contacts and then the powder voltage is increased by a recharging device (12) attached from the outside
  • a third charging process by triboelectric recharging is provided here.
  • the state of charge achieved by external charging can hardly be increased significantly.
  • it is ensured that the charge state is maintained until it emerges from the nozzle opening (311) during the process of swirling the emerging flow. That without an outside
  • the applied electrostatic guide field which is supplied to the workpiece by electrostatic forces, can therefore penetrate the workpiece into the electrically neutral zones of the workpiece much more easily and thereby improve the exposure efficiency.
  • the guide body (44) has the task of converting the high linear flow velocity into a rotating powder outlet. This process results in a better powder distribution at a reduced exit speed, which additionally leads to an increase in the coating efficiency.

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  • Electrostatic Spraying Apparatus (AREA)
EP87900639A 1986-01-14 1987-01-09 Elektrostatische pulversprühvorrichtung mit triboelektrischer pulveraufladung Expired EP0252954B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87900639T ATE43517T1 (de) 1986-01-14 1987-01-09 Elektrostatische pulverspruehvorrichtung mit triboelektrischer pulveraufladung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863600808 DE3600808A1 (de) 1986-01-14 1986-01-14 Elektrostatische pulverspruehvorrichtung mit triboelektrischer pulveraufladung
DE3600808 1986-01-14

Publications (2)

Publication Number Publication Date
EP0252954A1 EP0252954A1 (de) 1988-01-20
EP0252954B1 true EP0252954B1 (de) 1989-05-31

Family

ID=6291791

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87900639A Expired EP0252954B1 (de) 1986-01-14 1987-01-09 Elektrostatische pulversprühvorrichtung mit triboelektrischer pulveraufladung

Country Status (5)

Country Link
US (1) US4798340A (ja)
EP (1) EP0252954B1 (ja)
JP (1) JPH0673646B2 (ja)
DE (2) DE3600808A1 (ja)
WO (1) WO1987004088A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3924425C1 (en) * 1989-07-24 1990-12-20 Gering, Manfred Electrostatic sprayer for powder lacquering - has coaxial circular channels through which particles pass in zigzag formation

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DE3600808A1 (de) * 1986-01-14 1987-07-16 Esb Voehringer Elektrostatische pulverspruehvorrichtung mit triboelektrischer pulveraufladung
SE461319B (sv) * 1987-04-28 1990-02-05 Ac Greiff Ytbehandling Ab Anordning vid pulverspruta innefattande en ringformig friktionsuppladdningskanal
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DE4242221C2 (de) * 1992-07-13 1997-08-14 Hans Glogau Triboelektrische Spritzpistole
US5344082A (en) * 1992-10-05 1994-09-06 Nordson Corporation Tribo-electric powder spray gun
DE4312262A1 (de) * 1993-04-15 1994-10-20 Gema Volstatic Ag Elektrostatische Sprühvorrichtung
DE69425023T2 (de) * 1993-05-07 2001-02-22 Nordson Corp Pulverbeschichtungssystem und Pulverbeschichtungsdicke-Sensor
US5400976A (en) * 1993-06-02 1995-03-28 Matsuo Sangyo Co., Ltd. Frictional electrification gun
DE4325911A1 (de) * 1993-08-02 1995-02-09 Gema Volstatic Ag Elektrostatische Pulversprühvorrichtung
US5622313A (en) * 1995-03-03 1997-04-22 Nordson Corporation Triboelectric powder spray gun with internal discharge electrode and method of powder coating
FR2750897B1 (fr) * 1996-07-10 1998-09-18 Sames Sa Projecteur triboelectrique, installation de projection de produit de revetement et procede de commande d'un tel projecteur
US20040011901A1 (en) * 2000-07-10 2004-01-22 Rehman William R. Unipolarity powder coating systems including improved tribocharging and corona guns
JP2004502532A (ja) * 2000-07-11 2004-01-29 ノードソン　コーポレーション 改良された摩擦帯電コロナガンを包含する単極粉体塗装機構
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DE10261978B3 (de) * 2002-01-18 2004-11-11 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Pulversprühvorrichtung und Verfahren
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US20050023385A1 (en) * 2003-07-29 2005-02-03 Kui-Chiu Kwok Powder robot gun
US20050056212A1 (en) * 2003-09-15 2005-03-17 Schaupp John F. Split shroud for coating dispensing equipment
US20050173556A1 (en) * 2004-02-09 2005-08-11 Kui-Chiu Kwok Coating dispensing nozzle
DE102005017931A1 (de) * 2005-04-18 2006-10-19 Itw Gema Ag Pulversprühbeschichtungspistole und Pistolengehäuse hierzu
US8371517B2 (en) 2007-06-29 2013-02-12 Illinois Tool Works Inc. Powder gun deflector
US20090020626A1 (en) * 2007-07-16 2009-01-22 Illinois Tool Works Inc. Shaping air and bell cup combination
US10155233B2 (en) * 2008-04-09 2018-12-18 Carlisle Fluid Technologies, Inc. Splash plate retention method and apparatus
GB2476836B (en) * 2010-01-12 2011-11-23 Rolls Royce Plc Spray nozzle
GB2476835B (en) * 2010-01-12 2012-02-01 Rolls Royce Plc Spray nozzle
JP5738546B2 (ja) * 2010-06-07 2015-06-24 トヨタ自動車株式会社 静電塗装装置および静電塗装方法
EP2650051B1 (de) * 2012-04-10 2019-04-03 Wagner International AG Keileinsatz für eine Pulverrohrverlängerung einer mit Hochspannung betreibbaren Pulversprühistole und Pulverrohrverlängerung mit Keileinsatz
JP5959488B2 (ja) * 2013-10-09 2016-08-02 旭サナック株式会社 粉体塗装方法
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3924425C1 (en) * 1989-07-24 1990-12-20 Gering, Manfred Electrostatic sprayer for powder lacquering - has coaxial circular channels through which particles pass in zigzag formation

Also Published As

Publication number Publication date
WO1987004088A1 (en) 1987-07-16
JPS63502408A (ja) 1988-09-14
DE3760194D1 (en) 1989-07-06
DE3600808A1 (de) 1987-07-16
US4798340A (en) 1989-01-17
JPH0673646B2 (ja) 1994-09-21
EP0252954A1 (de) 1988-01-20

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