EP0241823B1 - Elektrostatische Pulversprühpistole - Google Patents

Elektrostatische Pulversprühpistole Download PDF

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Publication number
EP0241823B1
EP0241823B1 EP87104989A EP87104989A EP0241823B1 EP 0241823 B1 EP0241823 B1 EP 0241823B1 EP 87104989 A EP87104989 A EP 87104989A EP 87104989 A EP87104989 A EP 87104989A EP 0241823 B1 EP0241823 B1 EP 0241823B1
Authority
EP
European Patent Office
Prior art keywords
air
spray gun
powder
sleeve
powder spray
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
EP87104989A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0241823A2 (de
EP0241823A3 (en
Inventor
Arkadijus Rese
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.)
Wagner International AG
Original Assignee
Wagner International AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wagner International AG filed Critical Wagner International AG
Publication of EP0241823A2 publication Critical patent/EP0241823A2/de
Publication of EP0241823A3 publication Critical patent/EP0241823A3/de
Application granted granted Critical
Publication of EP0241823B1 publication Critical patent/EP0241823B1/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
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1691—Apparatus to be carried on or by a person or with a container fixed to the discharge device
    • 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

Definitions

  • the invention relates to an electrostatic powder spray gun according to the preamble of claim 1.
  • a powder spray gun is known from DE-B-1 284 883.
  • the distance of the baffle plate from the mouth of the gun tube and thus the powder jet can be more or less widened, for which purpose the support rod carrying the baffle plate is slidably mounted in the gun body.
  • a disadvantage here is that special manipulations, such as loosening and tightening a fixing screw, are required for the adjustment, the adjustment is thus cumbersome and usually cannot be carried out during the spraying process.
  • an electrostatic spray gun for liquid coating material is known from FR-A 2 267 154, in which when the trigger guard is pivoted, first the path for the air and then the path for the paint are released, that is to say the gun is switched on.
  • this spray gun points no impact body and no rod carrying an impact body.
  • the object of the present invention is therefore to design an electrostatic powder spray gun of the type mentioned in the preamble of patent claim 1 in such a way that a continuous adjustment between a sharp powder jet and a powder cloud of considerable radial diameter is possible without special manipulations during the spraying operation.
  • the solution to this problem results from the characterizing features of patent claim 1.
  • the emerging powder jet is thus expanded by additional compressed air, the action of which on the powder jet is controlled by an air deflecting body, which in turn can be adjusted by the trigger gun of the powder gun.
  • This air deflector is able to regulate the additional compressed air between the full discharge of this additional compressed air and the complete shut-off of the latter, which provides all possibilities from the large-sized powder cloud to the sharp powder jet, simply by the operator switching on and off of the trigger pulling trigger pulls more or less. A maximum adjustment possibility is thus achieved with simple handling.
  • the trigger guard does not cause any displacement of the air deflecting body in the first section of its swivel path, so in this first section only the switching on and off processes for high voltage, compressed air and powder supply take place.
  • the powder gun shown in the drawing has a base body designated as a whole by 10, which has approximately the shape of a "T", the horizontal part 11 being a tubular body pointing in the spraying direction, while the part 12 which extends obliquely downwards as Handle is shaped.
  • the horizontal tubular body 11 is closed at its rear end opposite the spraying direction by a screw cap 13, while its front end is connected by means of a plug-in connection and a union nut 14 to a pistol tube, designated as a whole by 15.
  • a coaxial inner tube 16 extends in the front region 15a of the pistol tube 15 , wherein the annular space 17 between the inner tube 16 and the front gun tube 15a represents the feed for the powder-air mixture to be sprayed and opens into the open at 17a.
  • a channel 18 for the powder-air mixture runs eccentrically in the rear part 15b of the gun tube 15, which is connected to the annular space 17 on its front side and has a connection to a feed source for the powder-air mixture at its rear end, as will be explained in more detail later.
  • a rod 19 is slidably arranged, into which a further rod 21 is screwed at its front end, which rod extends out of it Mouth of the gun barrel 15 protruding end thickened to a deflector 22.
  • a blind hole in the rod 21 there is a high-resistance resistor 23, at the front end of which a needle electrode 24 is centrally penetrating and projecting beyond the deflecting body 22.
  • the rear end of the resistor 23 is supported by a spring 25 against the bottom of the blind hole.
  • the rod 21 tapers towards its screw-in end, a helical spring 26 being pushed onto the tapered part 21a. It is essential that between the front rod 21 and the rear rod 19 and the inner tube 16 there is a coherent annular space 27 which runs through the entire pistol tube and which opens out at 27a at a distance in front of the deflecting body 22 and is at the rear in the form of a Continues annular channel into the horizontal part 11 of the base body 10 up to a seal 28.
  • the aforementioned helical spring 26 constitutes an electrical contact and is connected on the one hand via the spring 25 to the high arc resistor 23 and on the other hand connected to a lead wire 29 which leads through the annular space 27 to the rear to the pipe section 11 of the base body 10.
  • a high-voltage generator 30 is accommodated, which is fed with a high-frequency low voltage via a line 31 and gives the rectified high voltage generated in it to an electrical cable 32, the free end of which is electrically connected to the aforementioned conductor wire 29 of the gun barrel 15. There is thus an uninterrupted conductor connection between the output of the high voltage generator 30 and the needle electrode 24.
  • a rod 33 is axially displaceably mounted in an axial bore of the tube piece 11, which is connected at its front end by means of a coupling piece 34 to the rear end of the rod 19 and with its rear end is screwed into a piston 35, which is loaded by a coil spring 36 in the forward direction. Furthermore, the rod 33 is loosely surrounded by a multi-part sleeve, generally designated 37, which is supported by a spring 38 against the front end of the piston 35.
  • the sleeve 37 consists of a sleeve tube 37a with a rear collar 37b and a front clamping sleeve 37c screwed thereto for prestressing inner and outer sealing elements.
  • a trigger bracket 40 articulated at 39 rests on the one hand on the front end of the sleeve 37 or its clamping sleeve 37c and on the other hand on an abutment 41.
  • the trigger guard 40 is pressed by the action of the spring 38 via the sleeve 37 against its abutment 41, there then being a small distance between the sleeve 37 and the piston 35; there is a further, somewhat larger distance between the rear end of the piston 35 and the screwable end cap 13. It is also important that the collar 37b of the sleeve 37 is pressed with its front surface against an annular valve seat 42 of the axial bore.
  • a conveying tube 45 which has a suction opening 45a and is attached vertically down to the vicinity of the cup base, is fastened to the screw cap. Furthermore, an air pipe 46 passing through the cover is attached to the cover 44, which projects upwards a little above the cover 44 and opens into the delivery pipe 45 within the cup 43 adjacent to the opening 45a.
  • the upper end of the air tube 46 protruding beyond the cover 44 is inserted, together with its protective sleeve 47, into a connecting nipple 48 on the underside of the tube piece 11, the nipple 48 having an elastic valve seat 49 and a valve ball 51 loaded against the valve seat by a spring 50.
  • a transverse bore 46a is provided in the cover 44, which on the one hand with the air tube 46 and on the other hand with the interior. of the powder cup 43 is connected.
  • the powder cup 43 is advantageously held on the powder gun by a releasable clamp connection (not shown) or the like.
  • a line 70 is provided with a connection nipple 71 for compressed air, the opening into the interior of the gun, however, is closed in the position shown, namely by the collar 37b of the sleeve 37, which acts as a valve body and rests on the valve seat 42. Moves however, as will be explained later, the collar 37b away from the valve seat 42, then an annular space is created between these two parts, into which the compressed air supplied by the line 70 can penetrate.
  • This annular space is connected to a channel which runs essentially parallel to the gun axis outside the sectional plane of the drawing and which is connected to the annular space 27 located in front of the seal 28, the annular space 27 on the one hand - as mentioned - through the entire gun tube 15 to the mouth 27a leads, and on the other hand via a channel 73 with the interior of the connecting nipple 48 in connection.
  • the powder gun works as follows. In the position shown in the drawing, the trigger guard 40 is not pulled off, ie the powder gun is in the rest position.
  • the valve consisting of the collar 37b and the valve seat 42 thus blocks the compressed air supply and also the high voltage is switched off because the magnet 80 located on the trigger guard 40 is too far away from the magnetic switch 81 of the handle 12. If the trigger guard 40 is now pulled off, ie pivoted a little bit clockwise around its articulation point 39, then it pushes the sleeve 37 to the left against the force of the spring 38, without however the collar 37b already touching the front end of the piston 35.
  • compressed air from the channel 27 passes through the bore 73 into the interior of the connection nipple 48 and further into the air pipe 46, a small part of the air flowing through the cover bore 46a into the upper part of the cup 43 and the powder therein whirls up, while the main part of the air flows out of the mouth of the air tube 46 located within the delivery tube 45 and sucks powder located in the powder cup 43 through the opening 45a by means of an injector action and carries it upward in the delivery tube 45.
  • the powder-air mixture flowing upwards in the delivery pipe 45 then passes into the channel 18 and further into the channel 17 until it finally emerges at 17a as a spray cloud.
  • the collar 37b of the sleeve 37 engages and pushes the front end of the piston 35 to the left, the possible displacement path being equal to the distance between the rear end 35b of the piston 35 and the base 93b of the sleeve 93 is.
  • This distance between the surfaces 35b and 93b can, however, be adjusted in a simple manner according to FIG. 3B, namely by screwing the closure sleeve 13 holding the sleeve 93.
  • the trigger guard 40 is only retracted a short distance so that the piston 35 is not touched by the sleeve 37 and thus in it Right end position remains, then the compressed air emerging from the ring opening 27a is deflected radially outwards by the body 22 located comparatively far in front of the ring opening 27a, but without transferring a substantial part of its kinetic energy to the body 22.
  • the radially deflected air is thus able to deflect the powder-air mixture emerging from the ring opening 17a considerably in the radial direction, ie the powder jet is greatly expanded and a powder cloud of considerable diameter results. If the trigger is then pulled further, then the sleeve 37 moves the piston 35 to the left, so that the body 22 approaches the edge of the tube 16.
  • the compressed air exiting from the ring opening 27a releases more kinetic energy onto the body 22 due to its stronger impact and thus causes less expansion of the powder jet. If the trigger guard 40 is pulled back further, then the body 22 finally reaches the position shown at 22 'and closes the ring opening 27a.
  • the powder jet emerging from the ring opening 17a is no longer widened at all, the powder jet therefore has a comparatively small diameter, as is desired, for example, for coating cavities.
  • a continuous control of the powder jet can thus be carried out from the trigger guard 40, specifically from a powder cloud of considerable diameter to a comparatively sharp powder jet. However, this control takes place without a mechanical obstacle (powder baffle plate) but only through the additional compressed air.
  • a powder baffle plate 100 of conventional shape is attached to the front area of the tube 16, the front surface 100a of which is aligned with the end edge of the tube 16.
  • the connection between baffle plate 100 and tube 16 can be made by thread or by a snug fit, with which the baffle plate 100 can then be placed or removed at any time or replaced by a baffle plate of a different diameter.
  • the maximum diameter of the body 22 is dimensioned slightly smaller than the outer diameter of the tube 16 so that the baffle plate 100 can be easily attached or removed. If the trigger guard 40 is pulled all the way through during operation of this powder gun according to FIG.
  • the powder gun works like the known powder guns with a powder baffle plate.
  • the trigger guard 40 will not be pulled all the way through so as to allow compressed air to escape from the ring opening 27a, in which case this compressed air ensures that no powder can settle on the front side 100a of the baffle plate 100. This compressed air can also lead to a further expansion of the powder cloud.
  • the body 22 has a maximum diameter equal to or substantially equal to the outer diameter of the tube 16, that is to say as a pure deflecting body for the compressed air
  • the deflecting body shown in FIG. 5 and designated 22a there has a substantially enlarged diameter, which is substantially the same as the outer diameter of the front part 15a of the gun barrel 15.
  • the radial outer region of the body 22a thus extends in front of the ring opening 17a, that is to say in the axial direction before the powder jet emerges, similar to the case of FIG usual powder baffle. Nevertheless, this body 22a acts in a different way.
  • the compressed air emerging from the ring opening 27a namely flows radially outwards as a layer on the rear side of the body 22a, so that the powder particles emerging from the ring opening 17a do not reach the rear side of the body 22a but are already deflected radially outwards in front of the latter, namely in very strong measure, so that a powder cloud of considerable diameter arises.
  • the body 22a Only when pulling through completely of the trigger guard 40, the body 22a is withdrawn to the left so far that it closes the ring opening 27a, it acts as a conventional powder baffle.
  • the embodiment according to FIG. 5 thus represents, so to speak, a combination of the embodiments according to FIGS. 3 and 4.
  • the body 22a does not represent a mere thickening of the rod 21 but is a separate body which, as shown in the drawing visible, is screwed onto the front end of the rod. This makes it possible to exchange different bodies 22a of different sizes and shapes with one another.
  • the invention is not limited to the exemplary embodiments shown, but numerous modifications are possible without departing from the scope of the invention.
  • the invention is of course not only applicable to cup powder guns, but also to powder guns with the powder-air mixture supplied from a remote powder processing plant.
  • the mechanical connection between the body 22 and the trigger guard 40 can also be solved constructively in another way, for example in such a way that the body 22 immediately begins its retraction movement when the trigger guard 40 is actuated.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Nozzles (AREA)
EP87104989A 1986-04-07 1987-04-03 Elektrostatische Pulversprühpistole Expired - Lifetime EP0241823B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3611577 1986-04-07
DE19863611577 DE3611577A1 (de) 1986-04-07 1986-04-07 Elektrostatische pulver-spruehpistole

Publications (3)

Publication Number Publication Date
EP0241823A2 EP0241823A2 (de) 1987-10-21
EP0241823A3 EP0241823A3 (en) 1988-10-12
EP0241823B1 true EP0241823B1 (de) 1992-02-12

Family

ID=6298096

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87104989A Expired - Lifetime EP0241823B1 (de) 1986-04-07 1987-04-03 Elektrostatische Pulversprühpistole

Country Status (5)

Country Link
US (1) US4828185A (da)
EP (1) EP0241823B1 (da)
JP (1) JPS631473A (da)
DE (2) DE3611577A1 (da)
DK (1) DK174687A (da)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2543398B2 (ja) * 1988-09-09 1996-10-16 アロイ工器株式会社 塗装用スプレ―ノズル
DE4141663C2 (de) * 1991-12-17 1996-09-19 Wagner Int Elektrostatische Pulver-Beschichtungspistole
DE19614193A1 (de) * 1996-04-10 1997-10-16 Abb Patent Gmbh Dispergiersystem für eine Pulversprüheinrichtung
DE19625099A1 (de) * 1996-06-24 1998-01-02 Heidelberger Druckmasch Ag Verfahren zum Pudern einer bedruckten Oberfläche eines Bedruckstoffes
US5850976A (en) * 1997-10-23 1998-12-22 The Eastwood Company Powder coating application gun and method for using the same
WO2003031075A1 (en) * 1999-09-16 2003-04-17 Nordson Corporation Powder spray gun with inline angle spray nozzle
US6478242B1 (en) * 1999-09-16 2002-11-12 Nordson Corporation Powder spray gun
DE10202025B4 (de) * 2002-01-18 2005-08-04 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Pulversprühvorrichtung und Pulversprühverfahren
USD1027343S1 (en) * 2023-04-17 2024-05-14 Hefei Yaozhong International Trade Co., Ltd. Powder duster

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2552907A (en) * 1947-11-26 1951-05-15 Vilbiss Co Spray gun
US2904262A (en) * 1954-11-04 1959-09-15 Vilbiss Co Spray gun
CH429517A (de) * 1965-12-06 1967-01-31 Gema Ag Pulversprühorgan zum Beschichten von Gegenständen im elektrostatischen Feld
US3448925A (en) * 1966-10-21 1969-06-10 Turco Mfg Co Air spray gun for electrostatic coating systems
DE1284883B (de) * 1967-10-17 1968-12-05 Mueller Ernst Fa Verfahren und Vorrichtung zum Herstellen von UEberzuegen aus feinverteilten, fluessigen oder festen Stoffen
CH496481A (de) * 1969-06-25 1970-09-30 Gema Ag App Bau Vorrichtung zum elektrostatischen Beschichten von Gegenständen mit zerstäubten Feststoffpartikeln
DE2022088C3 (de) * 1970-05-06 1981-04-23 Graco Inc., Minneapolis, Minn. Spritzpistole zum Aufbringen von Schutzschichten aus Kunststoffpulver
FR2267154A1 (en) * 1974-04-10 1975-11-07 Skm Sa Compressed air paint spray gun - has trigger opening air supply valve and sliding paint supply valve rod
JPS5145143A (en) * 1974-10-16 1976-04-17 Ransburg Japan Ltd Funshapataanno choseiga kanona funtaitosoyofunshanozuru
DE2509851C2 (de) * 1975-03-06 1984-03-15 Ransburg-Gema AG, 9015 St.Gallen Pulverzerstäuber mit Prallkörper zum Beschichten von Gegenständen im elektrostatischen Feld
DE2514160B2 (de) * 1975-03-29 1980-05-08 Esb Elektrostatische Spritz- Und Beflockungsgesellschaft G.F. Voehringer Gmbh, 7991 Oberteuringen Elektrostatisches Sprühgerät für pulverförmiges Sprühgut
US4241880A (en) * 1979-03-16 1980-12-30 Nordson Corporation Electrostatic spray gun
US4380320A (en) * 1981-02-25 1983-04-19 Nordson Corporation Electrostatic powder spray gun nozzle
SU952357A1 (ru) * 1981-03-18 1982-08-23 Институт Прикладной Физики Ан Мсср Распылитель
DE3412507A1 (de) * 1984-04-03 1985-10-17 J. Wagner AG, Altstätten Elektrostatische handspritzpistole
DE3420325A1 (de) * 1984-05-30 1985-12-05 Ransburg-Gema AG, St.Gallen Spruehvorrichtung zum beschichten von gegenstaenden mit pulver

Also Published As

Publication number Publication date
DE3611577A1 (de) 1987-10-15
DK174687A (da) 1987-10-08
JPS631473A (ja) 1988-01-06
DE3776665D1 (de) 1992-03-26
EP0241823A2 (de) 1987-10-21
EP0241823A3 (en) 1988-10-12
DE3611577C2 (da) 1989-10-12
US4828185A (en) 1989-05-09
DK174687D0 (da) 1987-04-06

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