EP0634225B1 - Device for discharging the walls of a plastic booth - Google Patents
Device for discharging the walls of a plastic booth Download PDFInfo
- Publication number
- EP0634225B1 EP0634225B1 EP94110041A EP94110041A EP0634225B1 EP 0634225 B1 EP0634225 B1 EP 0634225B1 EP 94110041 A EP94110041 A EP 94110041A EP 94110041 A EP94110041 A EP 94110041A EP 0634225 B1 EP0634225 B1 EP 0634225B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- walls
- plastic
- booth
- plastic booth
- workpieces
- 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
Links
Images
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
- B05B5/08—Plant for applying liquids or other fluent materials to objects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
- B05B14/40—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths
- B05B14/42—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths using electrostatic means
Definitions
- the invention relates to a device for unloading the Walls of a plastic cabin in which workpieces are made a powder spray device are coated, the Powder is energized in the powder spray device and the workpiece is grounded.
- a device is known from US-A-4,898,116 which a method of removing on the floor of the cabin shows deposited charged powder particles.
- plastic cabins for the purpose described should the inner walls from time to time electrically for the following reasons be neutralized: not all powder particles are in the powder spray device (spray gun) negatively charged. Rather, there is always a small proportion oppositely charged particles, especially in the fine grain range. It follows that after a long period of operation Plastic cabin is strongly adhering to the inside walls Base made of uncharged and partially positively charged Fine grain powder particles forms (the walls of the plastic cabin are negatively charged). With the from time to time This floor covering is very difficult to clean the cabin remove, as it immediately reappears during mechanical blowing electrostatically attracted to the walls and again attached to it.
- the invention is based on the object To avoid disadvantages and a device in the preamble of claim 1 specified type to create which is an effective removal or at least diminution of surface charges on the inner walls of the plastic cabin can be achieved.
- This task is for a device according to the preamble of claim 1 by a to be brought into the plastic cabin grounded metal frame with the outside facing the walls the plastic cab pointing tip electrodes solved.
- the metal frame is from two parallel perforated plates connected by struts, from their circumferences the tip electrodes after all Stand out sides.
- the perforated sheets are in the case of movement the workpieces through the plastic cabin by means of the Conveyor arranged transversely to the direction of movement.
- the tip electrodes are preferably in the planes of Perforated sheets are arranged, and each perforated sheet can have a hanging bracket for hanging the frame on a conveyor exhibit.
- a method of electrically discharging the walls of one Plastic cabin has the features of claim 6.
- the method and the device according to the invention provide effective discharge of the inside walls of a plastic cabin, on which the very fine powder particles are due of static electricity.
- the discharge of the powder booth is particularly useful when changing colors.
- the Discharge does not take place mechanically but with the help the tip electrodes on the through the plastic cabin moving metal frame electrostatically.
- the tip electrodes, the smallest possible distance on the metal frame are arranged, suck as they move along the inner walls the charges from the inner walls and neutralize them through it.
- Metal frame has two spaced apart Perforated sheets 4, 4 that are parallel to each other and transverse to the direction of movement (Arrow A) of a conveyor, not shown stand and kept apart by struts 6 are.
- Perforated plates can be connected by frames be.
- Each perforated plate is a suspension bracket 8 with it attached hook 10 on.
- the metal frame 2 to a moving conveyor (indicated by the dash-dotted line 12) hooked so that the metal frame along the arrow A by means of the conveyor member 12 a dash-dotted plastic cabin 20 therethrough is movable.
- the front 22 is just like the back this plastic cabin 20 can be opened or closed by means of doors, when spraying takes place.
- this Fall are 2 pieces instead of the metal frame the overhead conveyor 12 promoted by the plastic cabin 20 and in a known manner by means of electrostatic spray devices coated.
- a slot 26 is arranged around the hook 10 for hanging the metal frame 2 upwards to the outside Allow conveyor 12 to pass.
- Each perforated plate 4 is around its entire, in the shown Embodiment according to the cross section of the plastic cabin square-shaped circumference with closely adjacent Tip electrodes 5, which lead to the inner walls, i.e. the floor 23, the ceiling 24 and the two side walls 28, 30 of the plastic cabin 20 down, in the plane of the respective Perforated plate 4 are oriented.
- bristles made of conductive Plastic attached, which is a direct conductive connection to the cabin wall (not shown).
Description
Die Erfindung betrifft eine Vorrichtung zum Entladen der Wände einer Kunststoffkabine, in der Werkstücke mittels einer Pulversprühvorrichtung beschichtet werden, wobei das Pulver in der Pulversprühvorrichtung unter Spannung gesetzt und das Werkstück geerdet wird. Eine solche Vorrichtung ist aus der US-A-4 898 116 bekannt, die ein Verfahren zum Entfernen von auf dem Boden der Kabine abgelagerten geladenen Pulverteilchen zeigt.The invention relates to a device for unloading the Walls of a plastic cabin in which workpieces are made a powder spray device are coated, the Powder is energized in the powder spray device and the workpiece is grounded. Such a device is known from US-A-4,898,116 which a method of removing on the floor of the cabin shows deposited charged powder particles.
In Kunststoff-Kabinen für den beschriebenen Zweck sollten die Innenwände von Zeit zu Zeit aus folgenden Gründen elektrisch neutralisiert werden: nicht alle Pulverteilchen werden in der Pulversprühvorrichtung (Sprühpistole) negativ aufgeladen. Es entsteht vielmehr stets auch ein kleiner Anteil entgegengesetzt geladener Teilchen, besonders im Feinkornbereich. Daraus ergibt sich, daß nach längerem Betrieb der Kunststoffkabine sich auf deren Innenwänden ein stark haftender Belag aus ungeladenen und zum Teil positiv geladenen Feinkorn-Pulverteilchen bildet (die Wände der Kunststoffkabine sind negativ geladen). Bei der von Zeit zu Zeit erfolgenden Kabinenreinigung ist dieser Belag nur sehr schwer zu entfernen, da er beim mechanischen Abblasen sogleich wieder elektrostatisch von den Wänden angezogen wird und erneut daran anhaftet.In plastic cabins for the purpose described should the inner walls from time to time electrically for the following reasons be neutralized: not all powder particles are in the powder spray device (spray gun) negatively charged. Rather, there is always a small proportion oppositely charged particles, especially in the fine grain range. It follows that after a long period of operation Plastic cabin is strongly adhering to the inside walls Base made of uncharged and partially positively charged Fine grain powder particles forms (the walls of the plastic cabin are negatively charged). With the from time to time This floor covering is very difficult to clean the cabin remove, as it immediately reappears during mechanical blowing electrostatically attracted to the walls and again attached to it.
Durch den Belag wird die erwünschte negative Ladung der Innenwände nach längerem Betrieb teilweise kompensiert. Dies mindert die sogenannte "Drückerelektrodenwirkung" der Kunststoffwände, welche normalerweise die ja ebenfalls negativ geladenen Pulverteilchen abstößt und somit in Richtung auf das geerdete Werkstück lenkt.The desired negative charge of the Inner walls partially compensated after prolonged use. This reduces the so-called "pusher electrode effect" of the plastic walls, which are usually negative repels charged powder particles and thus towards steers the grounded workpiece.
Der Erfindung liegt die Aufgabe zugrunde, die genannten Nachteile zu vermeiden und eine Vorrichtung der im Oberbegriff des Anspruchs 1 angegebenen Art zu schaffen, mittels der sich eine wirksame Entfernung oder mindestens Verminderung von Oberflächenladungen der Innenwände der Kunststoffkabine erreichen läßt.The invention is based on the object To avoid disadvantages and a device in the preamble of claim 1 specified type to create which is an effective removal or at least diminution of surface charges on the inner walls of the plastic cabin can be achieved.
Diese Aufgabe ist bei einer Vorrichtung gemäß dem Oberbegriff des Anspruchs 1 durch ein in die Kunststoffkabine einzubringendes geerdetes Metallgestell mit nach außen zu den Wänden der Kunststoffkabine hin weisenden Spitzenelektroden gelöst.This task is for a device according to the preamble of claim 1 by a to be brought into the plastic cabin grounded metal frame with the outside facing the walls the plastic cab pointing tip electrodes solved.
Handelt es sich um eine Kunststoffkabine, bei welcher die Werkstücke mittels einer geerdeten Fördervorrichtung durch die Kunststoffkabine bewegt werden, so ist vorteilhaft, wenn das erfindungsgemäße Metallgestell Haken oder dergleichen zua Anhängen an die Fördervorrichtung und zur Mitnahme durch diese aufweist. Is it a plastic cabin, in which the Workpieces by means of an earthed conveyor the plastic cabin are moved, so it is advantageous if the metal frame hook or the like according to the invention to attach to the conveyor and take it with you this has.
Bei einer konstruktiven Ausführung ist das Metallgestell von zwei parallelen, über Streben verbundenen Lochblechen gebildet, von deren Umfängen die Spitzenelektroden nach allen Seiten hin wegstehen. Die Lochbleche sind im Falle der Bewegung der Werkstücke durch die Kunststoffkabine mittels der Fördervorrichtung quer zur Bewegungsrichtung angeordnet.In a constructive version, the metal frame is from two parallel perforated plates connected by struts, from their circumferences the tip electrodes after all Stand out sides. The perforated sheets are in the case of movement the workpieces through the plastic cabin by means of the Conveyor arranged transversely to the direction of movement.
Vorzugsweise sind die Spitzenelektroden in den Ebenen der Lochbleche angeordnet, und jedes Lochblech kann einen Aufhängebügel zum Aufhängen des Gestells an eine Fördervorrichtung aufweisen.The tip electrodes are preferably in the planes of Perforated sheets are arranged, and each perforated sheet can have a hanging bracket for hanging the frame on a conveyor exhibit.
Ein Verfahren zum elektrischen Entladen der Wände einer
Kunststoffkabine weist die Merkmale des Anspruchs 6 auf.A method of electrically discharging the walls of one
Plastic cabin has the features of
Das Verfahren und die Vorrichtung nach der Erfindung schaffen eine wirksame Entladung der Innenwände einer Kunststoffkabine, an denen sich die sehr feinen Pulverpartikel aufgrund der statischen Aufladung absetzen. Die Entladung der Pulverkabine ist insbesondere bei einem Farbwechsel sinnvoll. Die Entladung erfolgt dabei nicht mechanisch sondern mit Hilfe der Spitzenelektroden an dem durch die Kunststoffkabine bewegten Metallgestell elektrostatisch. Die Spitzenelektroden, die in möglichst kleinen Abstand an dem Metallgestell angeordnet sind, saugen bei ihrer Bewegung entlang den Innenwänden die Ladungen von den Innenwänden ab und neutralisieren sie dadurch.The method and the device according to the invention provide effective discharge of the inside walls of a plastic cabin, on which the very fine powder particles are due of static electricity. The discharge of the powder booth is particularly useful when changing colors. The Discharge does not take place mechanically but with the help the tip electrodes on the through the plastic cabin moving metal frame electrostatically. The tip electrodes, the smallest possible distance on the metal frame are arranged, suck as they move along the inner walls the charges from the inner walls and neutralize them through it.
Die Erfindung ist im folgenden anhand einer Zeichnung an einem Ausführungsbeispiel mit weiteren Einzelheiten näher erläutert.The invention is based on a drawing an embodiment with further details explained.
Die einzige Figur zeigt eine perspektivische Darstellung
eines Metallgestelles in einer strichpunktiert angedeuteten
Kunststoffkabine. Das insgesamt mit der Bezugszahl 2 bezeichnete
Metallgestell hat zwei im Abstand angeordnete
Lochbleche 4, 4, die parallel zueinander und quer zur Bewegungsrichtung
(Pfeil A) eines nicht gezeigten Förderers
stehen und durch Streben 6 voneinander im Abstand gehalten
sind. Alternativ können die Lochbleche durch Rahmen verbunden
sein. Jedes Lochblech bist einen Aufhängebügel 8 mit daran
befestigtem Haken 10 auf. Über die Haken 10 wird das Metallgestell
2 an ein bewegtes Förderorgan (angedeutet durch die
strichpunktierte Linie 12) eingehängt, so daß das Metallgestell
längs des Pfeiles A mittels des Förderorganes 12 durch
eine strichpunktiert angedeutete Kunststoffkabine 20 hindurch
bewegbar ist. Die Frontseite 22 ist ebenso wie die Rückseite
dieser Kunststoffkabine 20 offen bzw. mittels Türen verschließbar,
wenn ein Sprühvorgang stattfindet. In diesem
Fall werden statt des Metallgestells 2 Werkstücke mittels
des Hängeförderers 12 durch die Kunststoffkabine 20 gefördert
und in bekannter Weise mittels elektrostatischen Sprühvorrichtungen
beschichtet. In der Decke 24 der Kunststoffkabine
20 ist ein Schlitz 26 angeordnet, um die Haken 10 zum Aufhängen
des Metallgestells 2 nach oben zum außerhalb angeordneten
Förderer 12 durchzulassen.The only figure shows a perspective view
of a metal frame in a dash-dotted line
Plastic cabin. All in all designated with the
Jedes Lochblech 4 ist um seinen gesamten, bei dem gezeigten
Ausführungsbeispiel entsprechend dem Querschnitt der Kunststoffkabine
quadratisch ausgebildeten Umfang mit eng benachbarten
Spitzenelektroden 5 besetzt, die zu den Innenwänden,
d.h. dem Boden 23, der Decke 24 und den beiden Seitenwänden
28, 30 der Kunststoffkabine 20 hin, in der Ebene des jeweiligen
Lochblechs 4 orientiert sind.Each
Zum Entladen der nach einer gewissen Betriebsdauer aufgeladenen
Innenwände 23, 24, 28, 30 wird anstelle von Werkstücken
das Metallgestell 2 durch die Kunststoffkabine 20 in Richtung
des Pfeiles A mittels des Hängeförderers 12 bewegt. Dabei
saugen die Spitzenelektroden 5 ähnlich wie Blitzableiter die
Ladungen von den Innenwänden ab und neutralisieren diese
dadurch.To unload those charged after a certain period of operation
Zusätzlich können an dem Gestell Borsten aus leitfähigem Kunststoff befestigt sein, die eine direkte leitende Verbindung zur Kabinenwand herstellen (nicht gezeigt).In addition, bristles made of conductive Plastic attached, which is a direct conductive connection to the cabin wall (not shown).
Claims (6)
- Device for discharging the walls (23, 24, 28, 30) of a plastic booth (20), in which workpieces can be coated by means of a powder spraying device, whereby the powder in the powder spraying device is charged and the workpiece is earthed, characterized by an earthed metal stand (2) to be introduced into the plastic booth (20) with point electrodes (5) pointing outwardly towards the walls (23, 24, 28, 30) of the plastic booth.
- Device according to claim 1, characterized in that the workpieces are moved by means of an earthed conveying device (12) through the plastic booth and in that the metal stand (2) has hooks (10) for hanging up on the conveying device (12) and for transportation by it.
- Device according to claim 1 or 2, characterized in that the metal stand (2) is formed by two parallel perforated plates (4) which are connected to each other, from the perimeters of which plates the point electrodes (5) project away towards all sides.
- Device according to claim 3, characterized in that the point electrodes (5) are arranged in the planes of the perforated plates (4).
- Device according to claim 3 or 4, characterized in that each perforated plate (4) has a hanger (8) for hanging up the stand on a conveying device (12).
- Method for the electrical discharging of the walls (23, 24, 28, 30) of a plastic booth (20), in which workpieces are moved by a conveyor (12) through the booth (20) and in the process are electrostatically coated by means of a powder spraying device, whereby the powder in the powder spraying device is charged and the workpiece is earthed, characterized in that in each case after a coating cycle, in place of workpieces a metal stand (2) provided with point electrodes (5) is conveyed through the plastic booth (20), whereby the point electrodes (5) are directed towards the walls (23, 24, 28, 30) of the plastic booth (20) which are to be discharged and the powder spraying device is stopped.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4323312A DE4323312C2 (en) | 1993-07-12 | 1993-07-12 | Device for electrically discharging the walls of a plastic cabin |
| DE4323312 | 1993-07-12 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0634225A2 EP0634225A2 (en) | 1995-01-18 |
| EP0634225A3 EP0634225A3 (en) | 1995-09-06 |
| EP0634225B1 true EP0634225B1 (en) | 1998-04-01 |
Family
ID=6492617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94110041A Expired - Lifetime EP0634225B1 (en) | 1993-07-12 | 1994-06-28 | Device for discharging the walls of a plastic booth |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0634225B1 (en) |
| DE (2) | DE4323312C2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19520498A1 (en) * | 1995-06-03 | 1996-12-05 | Gema Volstatic Ag | Cleaning method and device for coating powder |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2047743C2 (en) * | 1970-09-29 | 1982-05-27 | Eltex-Elektronik H. Grünenfelder, El.-Ing., Basel | Electrostatic charge discharging device - uses conductor formed in joined sections of differing lengths each carrying discharge electrodes |
| DE7610205U1 (en) * | 1976-04-01 | 1976-10-14 | Eltex-Elektronik H. Gruenenfelder, El.-Ing., Basel (Schweiz) | CONDUCTOR FOR A DEVICE FOR THE DISCHARGE OR CHARGING OF ELECTRICALLY INSULATING SURFACES |
| GB1588503A (en) * | 1978-01-05 | 1981-04-23 | Toff J D | Installation and method for electrostatic powder coating of articles |
| DE2857323A1 (en) * | 1978-01-05 | 1980-12-04 | J Toff | SPRAYBOOTH FOR USE IN ELECTROSTATIC POWDER COATING |
| CH663911A5 (en) * | 1983-08-29 | 1988-01-29 | Electronova Sa | ELECTROSTATIC COATING SYSTEM. |
| GB2204254A (en) * | 1987-03-24 | 1988-11-09 | Auto Paint Systems Limited | Electrostatic dry-powder spraying |
| US4898116A (en) * | 1987-09-14 | 1990-02-06 | Onoda Cement Company, Ltd. | Powder coating booth |
| JPH04176353A (en) * | 1990-11-06 | 1992-06-24 | Taikisha Ltd | Coating equipment |
-
1993
- 1993-07-12 DE DE4323312A patent/DE4323312C2/en not_active Expired - Fee Related
-
1994
- 1994-06-28 DE DE59405560T patent/DE59405560D1/en not_active Expired - Fee Related
- 1994-06-28 EP EP94110041A patent/EP0634225B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE4323312C2 (en) | 1997-04-10 |
| EP0634225A3 (en) | 1995-09-06 |
| DE4323312A1 (en) | 1995-01-26 |
| EP0634225A2 (en) | 1995-01-18 |
| DE59405560D1 (en) | 1998-05-07 |
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