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EP0071756B1 - Cabin for spray-coating objects with powder - Google Patents

Cabin for spray-coating objects with powder Download PDF

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Publication number
EP0071756B1
EP0071756B1 EP82105901A EP82105901A EP0071756B1 EP 0071756 B1 EP0071756 B1 EP 0071756B1 EP 82105901 A EP82105901 A EP 82105901A EP 82105901 A EP82105901 A EP 82105901A EP 0071756 B1 EP0071756 B1 EP 0071756B1
Authority
EP
European Patent Office
Prior art keywords
cabin
powder
floor
spray
filter
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
EP82105901A
Other languages
German (de)
French (fr)
Other versions
EP0071756A3 (en
EP0071756A2 (en
Inventor
Roland Gubler
Christian Muttner
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 AT82105901T priority Critical patent/ATE22236T1/en
Publication of EP0071756A2 publication Critical patent/EP0071756A2/en
Publication of EP0071756A3 publication Critical patent/EP0071756A3/en
Application granted granted Critical
Publication of EP0071756B1 publication Critical patent/EP0071756B1/en
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
    • B05B16/00—Spray booths
    • B05B16/20—Arrangements for spraying in combination with other operations, e.g. drying; Arrangements enabling a combination of spraying operations
    • B05B16/25—Arrangements for spraying in combination with other operations, e.g. drying; Arrangements enabling a combination of spraying operations for both automatic and manual spraying
    • 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
    • B05B14/41—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths by cleaning the walls of the booth
    • 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
    • B05B14/41—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths by cleaning the walls of the booth
    • B05B14/412—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths by cleaning the walls of the booth wherein the walls of the booth is perforated or porous walls and the walls are cleaned of or prevented from being contacted with excess material by a flow of fluid, e.g. air or water, directed into the booth
    • 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
    • B05B14/43—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths by filtering the air charged with excess material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B16/00—Spray booths
    • B05B16/90—Spray booths comprising conveying means for moving objects or other work to be sprayed in and out of the booth, e.g. through the booth
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S118/00—Coating apparatus
    • Y10S118/07—Hoods

Definitions

  • the invention relates to a cabin for spray coating objects with powder according to the features of the preamble of patent claim 1.
  • Such a cabin is known from WO 81/02117. Similar cabins are also known from DE-A-2 731 123 and 2 809 020.
  • the exhaust air purification units arranged on the long sides of the cabin draw powder-containing exhaust air from the cabin interior in the transverse direction of the cabin via filter elements. Powder separated from the exhaust air by the filter elements falls outside the cabin interior into channel-like containers which are arranged below them.
  • the cabin floor is inclined transversely to the longitudinal direction of the cabin and is designed as a slide with a smooth surface. Powder falling on the cabin floor slides sideways out of the cabin interior into containers under the filter elements.
  • DE-A-2 945 934 also shows a cabin consisting of three structural units. Of this, only the middle unit forms a spray coating space with spray devices arranged on the side and with powder reservoir arranged underneath it, covered by a sieve and taking up its entire horizontal cross section. The latter contains a fluid floor and catches falling powder. Powder feed lines lead from the reservoir to the spray devices.
  • the other two units serve as an entrance lock and an exit lock and contain exhaust air cleaning filters and blowers.
  • the fans extract powder-containing exhaust air from the middle unit in the longitudinal direction of the cabin and then through the side slots of the outer units and then into the filter in the longitudinal direction of the cabin. By reversing the air flow through the filter elements, powder adhering to them falls on a fluid floor.
  • the cabin has the disadvantage that it cannot be changed sufficiently, in particular cannot be extended, and requires a lot of space in relation to the spray coating space provided only by the central unit. No objects can be coated in the two outer units.
  • the flow paths from the spray coating room of the middle unit to the filters of the outer lock units are long and not straight, so that strong fans and a lot of energy are required. Powder falling off the filters cannot be driven back into the middle unit only during coating breaks and with strong counter air.
  • DE-A-2 946 436 and DE-B-2 546 920 show cabins in which the exhaust air is drawn down through the cabin floor. This is disadvantageous because it increases the falling speed of the powder. However, the powder should remain in the area of the objects to be coated for as long as possible.
  • DE-A-2 835 474 shows a cabin in which the exhaust air cleaning units are arranged directly below the coating space, so that all the powder falling down falls onto the filter elements of the exhaust air cleaning units.
  • the object of the invention is to provide a compact and easily powder-cleaned cabin of the type mentioned, in particular the filters of the exhaust air purification units being easy to clean and replace, and the cabin should be easily changeable.
  • Advantages of the invention are in particular: small, easily exchangeable filters; Easy access to the cabin through large openings created when changing the filter elements; Gentle sliding of the powder on the slightly inclined, preferably fluidized floor below the filter elements and in the cabin interior; Walls of the cabin easy to clean due to good accessibility; compact design; Powder falling off the filters can fall back into the cabin interior and through the cabin floor into the powder container even without counter air, solely by gravity.
  • Powder means powdery to granular coating material.
  • Fluid floor is a floor from which gas, normally air, emerges through a plurality of openings, which forms an air cushion on the floor from which the powder particles are carried.
  • FIG. 1 There are, for example, three niches 2 on the longitudinal side 1 of the cabin shown in FIG. 1.
  • the blower 6 sucks air out of the cabin via the filter elements 4 whose entire interior can be used as a spray coating room.
  • Powder falling off the filter elements 4 falls onto the cabins, which are designed as slides and are directed obliquely downwards into the cabin and from there falls in the direction of arrow 12 into the cabin interior back onto the cabin floor 8 and over this in the direction of arrows 17 and 18 through a Opening 9 into a container 10.
  • the powder also enters container 10, which is deposited on the cabin floor 8 by gravity in the interior of the cabin.
  • the powder container 10 is expediently covered by a sieve 11 against coarse contaminants. Gelie from a gas source 13 Finished gas sucks powder from the container 10 in an injector 19 and drives it via a line 14 to a spray gun 15 of a spray device for spray coating objects 16. Further compressed air sources 13 serve to supply gas to the counter-blowing elements 5 of the exhaust air cleaning units 3. Arrows 27 essentially show them horizontal suction of exhaust air and powder from the cabin interior to the filter elements of the exhaust air cleaning units.
  • the articles 16 are transported through the cabin by a conveyor 20.
  • Air 16 'extracted from the cabin interior via the filter elements 4 and expelled via the fans 6 has been adequately cleaned of powder by the filter elements 4 and can be put directly into the surrounding work space.
  • the cabin floor 8 is a so-called fluid floor. This consists essentially of two porous, in the longitudinal direction downwardly inclined towards the bottom opening 9. H. with a multiplicity of openings provided longitudinal plates 21 and two transverse plates 22 inclined downwards in the cabin transverse direction to the opening 9. Under the base plates 21 and 22 there are fluid chambers 23 connected to compressed air sources 13. This forms an air cushion over the provided base plates 21 and 22 on which the powder parts float. If the bottom plates, which are inclined in the transverse direction, are arranged at a relatively high angle and are only a short height, then they do not need to be designed as a fluid floor, but can have a smooth, closed surface. In this case, it is sufficient if the bottom parts 21, 23 which are inclined in the longitudinal direction are designed as a fluid bottom.
  • the bottom of the container 10 is formed in a similar manner by a fluid chamber 24 and an upwardly delimiting bottom plate 25 provided as a fluid bottom 26.
  • the conveyor device 20 transports the objects 16 to be coated via an entrance 31 and an exit 32 through the cabin interior.
  • a spray device of the cabin can be a wall element with a hand-held spray gun 15 that can be opened by doors 41.
  • automatically controlled spray guns 42 can also be provided.
  • the doors 41 also allow access to the cabin interior.
  • the spray devices with the spray guns 15 and 42 are all arranged on the same cabin side.
  • Spray devices 43 in the form of prepared wall elements with slots 44 for the passage of guns 15 or 42 can also be provided on the opposite side.
  • spraying devices mean all places in the cabin at which spray guns 15 or 42 can be attached or are attached for spray coating. It is also a particular advantage that the spray devices can be arranged on opposite sides of exhaust air cleaning units 5, 6.
  • the cabin is designed such that exhaust air purification units 5, 6 can also be exchanged for spray devices with guns 15 and 42, respectively. This is possible because the exhaust air purification units 5, 6 return powder separated from the exhaust air back into the part of the cabin interior which is suitable for spray coating due to the construction of the floor and the walls.
  • the cabin is composed of five structural units 45, 46, 47, 48 and 49 in the longitudinal direction. The number of units can be changed as desired. Exhaust air cleaning units on the one cabin side can also be exchanged for exhaust air cleaning units or spray devices on the other cabin side. A reservoir 51 with fresh powder puts fresh powder into the container 10 if necessary.
  • Figure 3 shows an end view of the cabin.
  • FIG. 4 shows that the niches 2 are formed by boxes 53 which are placed on cutouts 54 of the longitudinal sides 1 of the cabin together with the parts 4, 5 and 6 of the exhaust air cleaning units 3 in an easily replaceable manner.
  • the guide elements 7 designed as slides under the filter elements 4 can be designed as closed, smooth elements if their angle of inclination 55 is sufficiently steep that powder can slip off. This angle should be at least 45 ° with respect to a horizontal line, but is preferably 57.5 °. The same applies to the angle of inclination of the individual parts of the cabin floor 8.
  • the guide element 7 is also designed as a fluid floor with a cover plate 56 provided with through openings and a fluid chamber 57 which is connected to a compressed air source 13.
  • the exhaust air is withdrawn from the cabin interior essentially horizontally in accordance with the arrows 27, but rather somewhat from the bottom up to the filter elements 4.
  • the filter elements 4 are arranged so high that their average height 58 is at least the same, but preferably higher than the average height 59 of the cabin interior. Powder falling off the filter elements 4 is designated by 60.
  • the filter elements 4 accommodated therein form, together with the niche rear wall 61, an interchangeable filter unit 62.
  • These filter units 62 are considerably smaller and lighter than the mobile interchangeable filter units of the known cabins and weigh less than 10 kg, preferably only about 5 kg . This makes them easy to carry and quick to replace.
  • clamping elements 63 By means of clamping elements 63, they are pressed upwards in a sealing manner against the adjacent elements 5 and 6. Due to several smaller exhaust air cleaning units 3, the structure of the cabin is more variable than with large filter devices. A filter unit 62 or an entire exhaust air cleaning unit 3 can optionally be exchanged. This opens 54 openings in the Kabi walls and allow access to the cabin interior.
  • An essential feature is that the powder with the exhaust air from the interior of the cabin crosses the longitudinal direction of the cabin without redirection by the shortest route to the filter elements 4 and, after it has fallen off, is returned directly to the interior of the cabin without redirection directly to the longitudinal direction of the cabin. It is also important that powder falling off the filter elements 4 can continuously fall back into the cabin interior through the oblique guide elements 7 even during spray coating operations and without blowing counter air through the filter elements 4.
  • the cabin floor 8 can contain electrodes for generating alternating electrical fields, through which the resulting powder particles are repelled. Powder can be transported in a certain direction by generating migrating alternating electric fields.
  • the German patent specification DE-C-2 248 367 shows such possibilities.
  • a still further embodiment can consist in the fact that the cabin floor is formed by a revolving conveyor belt for collecting and discharging powder according to the German specification DE-B-2 546 920.

Landscapes

  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
  • Catching Or Destruction (AREA)
  • Nozzles (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

A spray-coating booth having on its side walls several air cleaners with easily interchanged and cleaned filter units that are relatively light in weight and can be carried by hand. In accordance with the design of the booth, the dimensions of the spray-coating area can be varied and the filter units can be interchanged with other types of units such as sprayers. Undesirable accumulation of powder is avoided because the air cleaners continuously precipitate powder filtered from the air. Powder transporting means within the booth, which may be inclined chutes with a fluidized bed, transport this excess powder from beneath the air cleaners at the side wall to the floor of the booth. The floor of the booth extends below the entire spray coating region and thereby also serves to collect excess spray powder which falls directly upon it. The powder is then returned for use to the spray-coating region.

Description

Die Erfindung betrifft eine Kabine zum Sprühbeschichten von Gegenständen mit Pulver gemäss den Merkmalen des Oberbegriffes von Patentanspruch 1.The invention relates to a cabin for spray coating objects with powder according to the features of the preamble of patent claim 1.

Eine solche Kabine ist aus der WO 81/02117 bekannt. Ähnliche Kabinen sind auch aus den DE-A-2 731 123 und 2 809 020 bekannt. Die an den Kabinenlängsseiten angeordneten Abluftreinigungseinheiten ziehen über Filterelemente pulverhaltige Abluft in Kabinenquerrichtung aus dem Kabineninnenraum ab. Von den Filterelementen aus der Abluft ausgeschiedenes Pulver fällt ausserhalb des Kabineninnenraumes in rinnenartige Behälter, die unter ihnen angeordnet sind.Such a cabin is known from WO 81/02117. Similar cabins are also known from DE-A-2 731 123 and 2 809 020. The exhaust air purification units arranged on the long sides of the cabin draw powder-containing exhaust air from the cabin interior in the transverse direction of the cabin via filter elements. Powder separated from the exhaust air by the filter elements falls outside the cabin interior into channel-like containers which are arranged below them.

Der Kabinenboden ist quer zur Kabinenlängsrichtung geneigt und als Rutsche mit glatter Oberfläche ausgebildet. Auf den Kabinenboden fallendes Pulver gleitet seitlich aus dem Kabineninnenraum heraus in Behälter unter den Filterelementen.The cabin floor is inclined transversely to the longitudinal direction of the cabin and is designed as a slide with a smooth surface. Powder falling on the cabin floor slides sideways out of the cabin interior into containers under the filter elements.

Weiter zeigt die DE-A-2 945 934 eine aus drei Baueinheiten bestehende Kabine. Davon bildet nur die mittlere Einheit einen Sprühbeschichtungsraum mit seitlich angeordneten Sprühvorrichtungen und mit unter ihm angeordneten, durch ein Sieb abgedeckten, seinen gesamten Horizontalquerschnitt einnehmenden Pulverreservoir. Letzteres enthält einen Fluidboden und fängt herunterfallendes Pulver auf. Vom Reservoir führen Pulverförderleitungen zu den Sprühvorrichtungen. Die beiden anderen Einheiten dienen als Eingangsschleuse und als Ausgangsschleuse und enthalten Abluftreinigungsfilter sowie Gebläse. Die Gebläse ziehen pulverhaltige Abluft in Kabinenlängsrichtung aus der mittleren Einheit ab und dann über seitliche Schlitze der äusseren Einheiten sowie anschliessend in Kabinenlängsrichtung in die Filter. Durch Umkehrung der Luftströmung durch die Filterelemente fällt an ihnen haftendes Pulver auf einen Fluidboden. Die Kabine hat den Nachteil, dass sie nicht ausreichend veränderbar, insbesondere nicht verlängerbar ist und mit Bezug auf den nur durch die mittlere Einheit gegebenen Sprühbeschichtungsraum viel Platz benötigt. In den beiden äusseren Einheiten können keine Gegenstände beschichtet werden. Die Strömungswege vom Sprühbeschichtungsraum der mittleren Einheit bis zu den Filtern der äusseren Schleusen-Einheiten ist lang und nicht geradlinig, sodass starke Gebläse und viel Energie erforderlich sind. Von den Filtern abfallendes Pulver kann nicht kontinuierlich, sondern nur in Beschichtungspausen und mit starker Gegenluft in die mittlere Einheit zurückgetrieben werden.DE-A-2 945 934 also shows a cabin consisting of three structural units. Of this, only the middle unit forms a spray coating space with spray devices arranged on the side and with powder reservoir arranged underneath it, covered by a sieve and taking up its entire horizontal cross section. The latter contains a fluid floor and catches falling powder. Powder feed lines lead from the reservoir to the spray devices. The other two units serve as an entrance lock and an exit lock and contain exhaust air cleaning filters and blowers. The fans extract powder-containing exhaust air from the middle unit in the longitudinal direction of the cabin and then through the side slots of the outer units and then into the filter in the longitudinal direction of the cabin. By reversing the air flow through the filter elements, powder adhering to them falls on a fluid floor. The cabin has the disadvantage that it cannot be changed sufficiently, in particular cannot be extended, and requires a lot of space in relation to the spray coating space provided only by the central unit. No objects can be coated in the two outer units. The flow paths from the spray coating room of the middle unit to the filters of the outer lock units are long and not straight, so that strong fans and a lot of energy are required. Powder falling off the filters cannot be driven back into the middle unit only during coating breaks and with strong counter air.

Ferner zeigen die DE-A-2 946 436 und die DE-B-2 546 920 Kabinen, bei denen die Abluft nach unten durch den Kabinenboden abgezogen wird. Dies ist nachteilig, weil dadurch die Fallgeschwindigkeit des Pulvers erhöht wird. Das Pulver sollte jedoch möglichst lange im Bereich der zu beschichtenden Gegenstände bleiben. Ausserdem zeigt die DE-A-2 835 474 eine Kabine, bei welcher die Abluftreinigungseinheiten unmittelbar unter dem Beschichtungsraum angeordnet sind, sodass das gesamte nach unten fallende Pulver auf die Filterelemente der Abluftreinigungseinheiten fällt.Furthermore, DE-A-2 946 436 and DE-B-2 546 920 show cabins in which the exhaust air is drawn down through the cabin floor. This is disadvantageous because it increases the falling speed of the powder. However, the powder should remain in the area of the objects to be coated for as long as possible. In addition, DE-A-2 835 474 shows a cabin in which the exhaust air cleaning units are arranged directly below the coating space, so that all the powder falling down falls onto the filter elements of the exhaust air cleaning units.

Durch die Erfindung soll die Aufgabe gelöst werden, eine kompakte und leicht von Pulver zu reinigende Kabine der eingangs genannten Gattung zu schaffen, wobei insbesondere die Filter der Abluftreinigungseinheiten leicht zu reinigen und auszuwechseln sowie die Kabine leicht veränderbar sein soll.The object of the invention is to provide a compact and easily powder-cleaned cabin of the type mentioned, in particular the filters of the exhaust air purification units being easy to clean and replace, and the cabin should be easily changeable.

Diese Aufgabe wird gemäss dem Kennzeichen des Patentanspruches 1 gelöst.This object is achieved in accordance with the characterizing part of patent claim 1.

Eine besonders vorteilhafte Lösung ist durch die Merkmale des Patentanspruches 6 gegeben. Weitere Merkmale ergeben sich aus den anderen Unteransprüchen.A particularly advantageous solution is given by the features of claim 6. Further features result from the other subclaims.

Vorteile der Erfindung sind insbesondere: Kleine, leicht wechselbare Filter; leichte Zugänglichkeit der Kabine durch grosse, beim Wechseln der Filterelemente entstehende Öffnungen; schonendstes Abrutschen des Pulvers auf dem leicht geneigten, vorzugsweise fluidisierten Boden unterhalb der Filterelemente und im Kabineninnenraum; Wände der Kabine durch gute Zugänglichkeit leicht reinigbar; kompakte Bauart; von den Filtern abfallendes Pulver kann auch ohne Gegenluft, allein durch Schwerkraft, kontinuierlich, in den Kabineninnenraum und über den Kabinenboden in den Pulverbehälter zurückfallen.Advantages of the invention are in particular: small, easily exchangeable filters; Easy access to the cabin through large openings created when changing the filter elements; Gentle sliding of the powder on the slightly inclined, preferably fluidized floor below the filter elements and in the cabin interior; Walls of the cabin easy to clean due to good accessibility; compact design; Powder falling off the filters can fall back into the cabin interior and through the cabin floor into the powder container even without counter air, solely by gravity.

Unter «Pulver» ist pulverförmiges bis körniges Beschichtungsmaterial zu verstehen. «Fluidboden» ist ein Boden, aus welchem durch eine Vielzahl von Öffnungen Gas, normalerweise Luft, austritt, welches auf dem Boden ein Luftkissen bildet, von welchem die Pulverteilchen getragen werden.“Powder” means powdery to granular coating material. “Fluid floor” is a floor from which gas, normally air, emerges through a plurality of openings, which forms an air cushion on the floor from which the powder particles are carried.

Eine Ausführungsform der Erfindung wird im folgenden mit Bezug auf Zeichnungen als Beispiel beschrieben. Es zeigen

  • Figur 1 einen schematischen Längsschnitt durch eine Kabine,
  • Figur2 eine Draufsicht auf die Kabine von Fig. 1.
  • Figur eine stirnseitige Ansicht der Kabine, und
  • Figur 4 einen Querschnitt durch eine Kabinennische mit einer Abluftreinigungseinheit.
An embodiment of the invention is described below with reference to drawings as an example. Show it
  • FIG. 1 shows a schematic longitudinal section through a cabin,
  • Figure 2 is a plan view of the cabin of Fig. 1st
  • Figure an end view of the cabin, and
  • Figure 4 shows a cross section through a cabin niche with an exhaust air cleaning unit.

Auf der in Figur 1 dargestellten Längsseite 1 der Kabine befinden sich beispielsweise drei Nischen 2. Darin befinden sich je beispielsweise zwei Filterelemente 4 einer Abluftreinigungseinheit 3 mit darüber angeordneten Gegenblaselementen 5 und Gebläsen 6. Das Gebläse 6 saugt über die Filterelemente 4 Luft aus der Kabine ab, deren gesamter Innenraum als Sprühbeschichtungsraum verwendet werden kann. Von den Filterelementen 4 abfallendes Pulver fällt auf schräg nach unten in die Kabine gerichtete, als Rutschen ausgebildete Leitelemente 7 und fällt von dort in Richtung des Pfeiles 12 in den Kabineninnenraum zurück auf den Kabinenboden 8 und über diesen in Richtung der Pfeile 17 und 18 durch eine Öffnung 9 in einen Behälter 10. In den Behälter 10 gelangt auch das Pulver, welches sich im Kabineninnenraum auf den Kabinenboden 8 durch Schwerkraft absetzt. Der Pulverbehälter 10 ist zweckmässigerweise durch ein Sieb 11 gegen grobe Verunreinigungen abgedeckt. Von einer Gasquelle 13 geliefertes Gas saugt in einem Injektor 19 Pulver aus dem Behälter 10 und treibt es über eine Leitung 14 zu einer Spritzpistole 15 einer Sprühvorrichtung zum Sprühbeschichten von Gegenständen 16. Weitere Druckluftquellen 13 dienen zur Gasversorgung der Gegenblaselemente 5 der Abluftreinigungseinheiten 3. Pfeile 27 zeigen die im wesentlichen horizontale Ansaugung von Abluft und Pulver aus dem Kabineninnenraum zu den Filterelementen der Abluftreinigungseinheiten. Die Gegenstände 16 werden durch einen Förderer 20 durch die Kabine transportiert.There are, for example, three niches 2 on the longitudinal side 1 of the cabin shown in FIG. 1. There are, for example, two filter elements 4 of an exhaust air cleaning unit 3 with counter-blowing elements 5 and blowers 6 arranged above them. The blower 6 sucks air out of the cabin via the filter elements 4 whose entire interior can be used as a spray coating room. Powder falling off the filter elements 4 falls onto the cabins, which are designed as slides and are directed obliquely downwards into the cabin and from there falls in the direction of arrow 12 into the cabin interior back onto the cabin floor 8 and over this in the direction of arrows 17 and 18 through a Opening 9 into a container 10. The powder also enters container 10, which is deposited on the cabin floor 8 by gravity in the interior of the cabin. The powder container 10 is expediently covered by a sieve 11 against coarse contaminants. Gelie from a gas source 13 Finished gas sucks powder from the container 10 in an injector 19 and drives it via a line 14 to a spray gun 15 of a spray device for spray coating objects 16. Further compressed air sources 13 serve to supply gas to the counter-blowing elements 5 of the exhaust air cleaning units 3. Arrows 27 essentially show them horizontal suction of exhaust air and powder from the cabin interior to the filter elements of the exhaust air cleaning units. The articles 16 are transported through the cabin by a conveyor 20.

Aus dem Kabineninnenraum über die Filterelemente 4 abgezogene und über die Ventilatoren 6 ausgestossene Luft 16' ist durch die Filterelemente 4 ausreichend von Pulver gereinigt worden und kann unmittelbar in den umgebenden Arbeitsraum gegeben werden.Air 16 'extracted from the cabin interior via the filter elements 4 and expelled via the fans 6 has been adequately cleaned of powder by the filter elements 4 and can be put directly into the surrounding work space.

Der Kabinenboden 8 ist ein sogenannter Fluidboden. Dieser besteht im wesentlichen aus zwei in Längsrichtung nach unten zur Bodenöffnung 9 hin geneigten porösen, d. h. mit einer Vielzahl von Öffnungen versehenen Längsplatten 21 und zwei in Kabinenquerrichtung zur Öffnung 9 nach unten geneigten Querplatten 22. Unter den Bodenplatten 21 und 22 befinden sich an Druckluftquellen 13 angeschlossene Fluidkammern 23. Dadurch bildet sich über den mit Öffnungen versehenen Bodenplatten 21 und 22 ein Luftkissen, auf welchem die Pulverteile schweben. Wenn die in Querrichtung schrägen Bodenplatten verhältnismässig stark geneigt angeordnet sind und nur eine kurze Höhe haben, dann brauchen sie nicht als Fluidboden ausgebildet zu sein, sondern können eine glatte geschlossene Oberfläche haben. In diesem Falle genügt es, wenn die in Längsrichtung geneigten Bodenteile 21, 23 als Fluidboden ausgebildet sind.The cabin floor 8 is a so-called fluid floor. This consists essentially of two porous, in the longitudinal direction downwardly inclined towards the bottom opening 9. H. with a multiplicity of openings provided longitudinal plates 21 and two transverse plates 22 inclined downwards in the cabin transverse direction to the opening 9. Under the base plates 21 and 22 there are fluid chambers 23 connected to compressed air sources 13. This forms an air cushion over the provided base plates 21 and 22 on which the powder parts float. If the bottom plates, which are inclined in the transverse direction, are arranged at a relatively high angle and are only a short height, then they do not need to be designed as a fluid floor, but can have a smooth, closed surface. In this case, it is sufficient if the bottom parts 21, 23 which are inclined in the longitudinal direction are designed as a fluid bottom.

Der Boden des Behälters 10 ist in ähnlicher Weise durch eine Fluidkammer 24 und eine sie nach oben begrenzende, mit Öffnung versehene Bodenplatte 25 als Fluidboden 26 ausgebildet.The bottom of the container 10 is formed in a similar manner by a fluid chamber 24 and an upwardly delimiting bottom plate 25 provided as a fluid bottom 26.

Die Fördervorrichtung 20 transportiert die zu beschichtenden Gegenstände 16 über einen Eingang 31 und einen Ausgang 32 durch den Kabineninnenraum.The conveyor device 20 transports the objects 16 to be coated via an entrance 31 and an exit 32 through the cabin interior.

Wie Figur 2 zeigt, kann eine Sprühvorrichtung der Kabine ein durch Türen 41 zu öffnendes Wandelement mit einer Handspritzpistole 15 sein. Es können jedoch auch automatisch gesteuerte Spritzpistolen 42 vorgesehen sein. Die Türen 41 ermöglichen auch den Zugang in den Kabineninnenraum. In Figur 2 sind die Sprühvorrichtungen mit den Spritzpistolen 15 und 42 alle auf der gleichen Kabinenseite angeordnet. Es können auch auf der gegenüberliegenden Seite Spritzvorrichtungen 43 in Form von vorbereiteten Wandelementen mit Schlitzen 44 zum Hindurchführen von Pistolen 15 oder 42 vorgesehen sein. Im Rahmen dieser Beschreibung sind also unter Sprühvorrichtungen alle Stellen der Kabine gemeint, an denen Spritzpistolen 15 oder 42 zum Sprühbeschichten angebracht werden können oder angebracht sind. Ein besonderer Vorteil ist auch, dass die Sprühvorrichtungen auf gegenüberliegenden Seiten von Abluftreinigungseinheiten 5, 6 angeordnet werden können. Die Kabine ist derart ausgebildet, dass auch Abluftreinigungseinheiten 5, 6 gegen Sprühvorrichtungen mit Pistolen 15 bzw. 42 ausgetauscht werden können. Dies ist dadurch möglich, weil die Abluftreinigungseinheiten 5, 6 aus der Abluft ausgeschiedenes Pulver wieder in den Teil des Kabineninnenraumes zurückgeben, welcher auf Grund der Konstruktion des Bodens und der Wände zum Sprühbeschichten geeignet ist. Bei dem in den Fig. 2 gezeigten Ausführungsbeispiel ist die Kabine in Längsrichtung aus fünf Baueinheiten 45, 46, 47, 48 und 49 zusammengestellt. Die Anzahl der Baueinheiten kann beliebig verändert werden. Auch können Abluftreinigungseinheiten der einen Kabinenseite gegen Abluftreinigungseinheiten oder Sprühvorrichtungen der anderen Kabinenseite vertauscht werden. Ein Reservoir 51 mit frischem Pulver gibt bei Bedarf frisches Pulver in den Behälter 10.As FIG. 2 shows, a spray device of the cabin can be a wall element with a hand-held spray gun 15 that can be opened by doors 41. However, automatically controlled spray guns 42 can also be provided. The doors 41 also allow access to the cabin interior. In Figure 2, the spray devices with the spray guns 15 and 42 are all arranged on the same cabin side. Spray devices 43 in the form of prepared wall elements with slots 44 for the passage of guns 15 or 42 can also be provided on the opposite side. In the context of this description, spraying devices mean all places in the cabin at which spray guns 15 or 42 can be attached or are attached for spray coating. It is also a particular advantage that the spray devices can be arranged on opposite sides of exhaust air cleaning units 5, 6. The cabin is designed such that exhaust air purification units 5, 6 can also be exchanged for spray devices with guns 15 and 42, respectively. This is possible because the exhaust air purification units 5, 6 return powder separated from the exhaust air back into the part of the cabin interior which is suitable for spray coating due to the construction of the floor and the walls. In the exemplary embodiment shown in FIG. 2, the cabin is composed of five structural units 45, 46, 47, 48 and 49 in the longitudinal direction. The number of units can be changed as desired. Exhaust air cleaning units on the one cabin side can also be exchanged for exhaust air cleaning units or spray devices on the other cabin side. A reservoir 51 with fresh powder puts fresh powder into the container 10 if necessary.

Figur 3 zeigt eine stirnseitige Ansicht der Kabine.Figure 3 shows an end view of the cabin.

Figur 4 zeigt, dass die Nischen 2 durch Kästen 53 gebildet sind, welche auf Ausschnitte 54 der Kabinenlängsseiten 1 zusammen mit den Teilen 4, 5 und 6 der Abluftreinigungseinheiten 3 leicht auswechselbar aufgesetzt sind. Die als Rutschen ausgebildeten Leitelemente 7 unter den Filterelementen 4 können als geschlossene, glatte Elemente ausgebildet sein, wenn ihr Neigungswinkel 55 ausreichend steil ist, dass Pulver abrutschen kann. Dieser Winkel sollte gegenüber einer Horizontalen mindestens 45° betragen und beträgt jedoch vorzugsweise 57,5°. Das gleiche gilt für den Neigungswinkel der einzelnen Teile des Kabinenbodens 8. Bei der Ausführungsform nach Fig. 4 ist auch das Leitelement 7 als Fluidboden mit einer mit Durchtrittsöffnungen versehenen Deckplatte 56 und einer Fluidkammer 57 ausgebildet, welche an eine Druckluftquelle 13 angeschlossen ist. Die Abluft wird aus dem Kabineninnenraum im wesentlichen horizontal entsprechend den Pfeilen 27, jedoch eher etwas von unten nach oben zu den Filterelementen 4 hin abgezogen. Zu diesem Zwecke sind die Filterelemente 4 so hoch angeordnet, dass ihre mittlere Höhe 58 mindestens gleich, vorzugsweise jedoch höher ist als die mittlere Höhe 59 des Kabineninnenraumes. Von den Filterelementen 4 abfallendes Pulver ist mit 60 bezeichnet. Bei jeder Nische 2 bilden die darin untergebrachten Filterelemente 4 zusammen mit der Nischenrückwand 61 eine für sich auswechselbare Filtereinheit 62. Diese Filtereinheiten 62 sind wesentlich kleiner und leichter als die fahrbaren auswechselbaren Filtereinheiten der bekannten Kabinen und wiegen weniger als 10 kg, vorzugsweise nur ungefähr 5 kg. Dadurch können sie leicht getragen und schnell ausgewechselt werden. Durch Spannelemente 63 werden sie nach oben dichtend gegen die angrenzenden Elemente 5 und 6 gedrückt. Durch mehrere kleinere Abluftreinigungseinheiten 3 ist der Aufbau der Kabine variabler als mit grossen Filtereinrichtungen. Es kann wahlweise eine Filtereinheit 62 oder eine ganze Abluftreinigungseinheit 3 ausgetauscht werden. Dabei werden Öffnungen 54 in den Kabinenwänden frei und ermöglichen den Zugang in den Kabineninnenraum.FIG. 4 shows that the niches 2 are formed by boxes 53 which are placed on cutouts 54 of the longitudinal sides 1 of the cabin together with the parts 4, 5 and 6 of the exhaust air cleaning units 3 in an easily replaceable manner. The guide elements 7 designed as slides under the filter elements 4 can be designed as closed, smooth elements if their angle of inclination 55 is sufficiently steep that powder can slip off. This angle should be at least 45 ° with respect to a horizontal line, but is preferably 57.5 °. The same applies to the angle of inclination of the individual parts of the cabin floor 8. In the embodiment according to FIG. 4, the guide element 7 is also designed as a fluid floor with a cover plate 56 provided with through openings and a fluid chamber 57 which is connected to a compressed air source 13. The exhaust air is withdrawn from the cabin interior essentially horizontally in accordance with the arrows 27, but rather somewhat from the bottom up to the filter elements 4. For this purpose, the filter elements 4 are arranged so high that their average height 58 is at least the same, but preferably higher than the average height 59 of the cabin interior. Powder falling off the filter elements 4 is designated by 60. In each niche 2, the filter elements 4 accommodated therein form, together with the niche rear wall 61, an interchangeable filter unit 62. These filter units 62 are considerably smaller and lighter than the mobile interchangeable filter units of the known cabins and weigh less than 10 kg, preferably only about 5 kg . This makes them easy to carry and quick to replace. By means of clamping elements 63, they are pressed upwards in a sealing manner against the adjacent elements 5 and 6. Due to several smaller exhaust air cleaning units 3, the structure of the cabin is more variable than with large filter devices. A filter unit 62 or an entire exhaust air cleaning unit 3 can optionally be exchanged. This opens 54 openings in the Kabi walls and allow access to the cabin interior.

Ein wesentliches Merkmal ist, dass das Pulver mit der Abluft vom Kabineninnenraum quer zur Kabinenlängsrichtung ohne Umlenkung auf kürzestem Wege zu den Filterelementen 4 gelangt und von diesen, nachdem es abgefallen ist, ohne Umlenkung unmittelbar wieder quer zur Kabinenlängsrichtung in das Kabineninnere zurückgeleitet wird. Ferner ist es wichtig, dass von den Filterelementen 4 abfallendes Pulver durch die schrägen Leitelemente 7 auch während Sprühbeschichtungsvorgängen, und ohne Gegenluft durch die Filterelemente 4 hindurchzublasen, kontinuierlich in den Kabineninnenraum zurückfallen kann.An essential feature is that the powder with the exhaust air from the interior of the cabin crosses the longitudinal direction of the cabin without redirection by the shortest route to the filter elements 4 and, after it has fallen off, is returned directly to the interior of the cabin without redirection directly to the longitudinal direction of the cabin. It is also important that powder falling off the filter elements 4 can continuously fall back into the cabin interior through the oblique guide elements 7 even during spray coating operations and without blowing counter air through the filter elements 4.

Anstelle der beschriebenen Ausführungsform mit Fluidboden, können der Kabinenboden 8, und auch die Kabinenwände, Elektroden zur Erzeugung elektrischer Wechselfelder enthalten, durch welche anfallende Pulverteilchen abgestossen werden. Durch Erzeugung von wandernden elektrischen Wechselfeldern kann anfallendes Pulver in eine bestimmte Richtung transportiert werden. Solche Möglichkeiten zeigt die deutsche Patentschrift DE-C-2 248 367.Instead of the described embodiment with a fluid floor, the cabin floor 8, and also the cabin walls, can contain electrodes for generating alternating electrical fields, through which the resulting powder particles are repelled. Powder can be transported in a certain direction by generating migrating alternating electric fields. The German patent specification DE-C-2 248 367 shows such possibilities.

Eine nochmals weitere Ausführungsform kann darin bestehen, dass der Kabinenboden durch ein umlaufendes Transportband zum Sammeln und Abführen von anfallendem Pulver nach der deutschen Auslegeschrift DE-B-2 546 920 ausgebildet ist.A still further embodiment can consist in the fact that the cabin floor is formed by a revolving conveyor belt for collecting and discharging powder according to the German specification DE-B-2 546 920.

Claims (9)

1. Cabin for the spray coating of objects with powder, having a cabin inlet (31) and a cabin outlet (32) for conveying objects through a coating room in the longitudinal direction of the cabin, having at least one spray device (15) at one longitudinal side of the cabin, having at least one exhaust air cleaning unit (3) disposed on one longitudinal side of the cabin, which has at least one filter element (4) in a box (53) open on one side, which is disposed with its open side towards the coating room at one longitudinal side of the cabin and is detatchably fixed to the cabin and together with the filter elements (4) forms a filter unit (62), and having a collecting device (8, 21, 23) for surplus powder, which extends over the entire length and width of the coating room on the cabin floor, characterised in that at least one of the longitudinal walls (1) of the cabin are provided several apertures (54) one behind the other for filter units (62), on each of which one filter unit (62) respectively can be disposed and thereby the box (53) of the filter unit forms a recess (2) open to the coating room, and in that for each recess (2) the recess floor (7) is constructed as a powder conveying element (7), which is disposed below the filter element (4), but higher than the cabin floor and leads into the coating room.
2. Cabin according to Claim 1, characterised in that the conveying elements (7) are chutes sloping downwards into the coating room.
3. Cabin according to Claim 1 or 2, characterised in that the conveying elements (7) have a fluid floor (56, 57).
4. Cabin according to one of Claims 1 to 3, characterised in that the replaceable filter units (62) containing a box (53) and filter elements (4) respectively are portable units having a weight of less than 10 kg, preferably with a weight of approximately 5 kg.
5. Cabin according to one of Claims 1 to 4, characterised in that the vertical centre (58) of the filter elements (4) is higher than the vertical centre (59) of the coating room.
6. Cabin according to one of Claims 1 to 5, characterised in that roughly in the centre of the cabin floor (8) of the coating room a powder collection aperture (9) is formed and in that the cabin floor is constructed as a chute sloping downwards to this aperture from all sides and over the entire cabin length occupied by the spray devices (15, 41, 42, 43, 44) and the exhaust air cleaning units (2 to 7).
7. Cabin according to one of Claims 1 to 6, characterised in that at least one part (21, 23) of the cabin floor (8) is constructed as a fluid floor.
8. Cabin according to Claim 6 or 7, characterised in that under the powder collection aperture (9) there is a container (10) receiving the powder from the cabin floor (8), in that to this container is connected a reservoir (52) supplying fresh powder, and in that from the container (10) leads at least one powder conveying line (14) to the spray devices (15, 41, 42, 43, 44).
9. Cabin according to one of Claims 1 to 8, characterised in that the filter units (62) containing a box (53) and filter elements (4) respectively are interchangeable with spray devices (43).
EP82105901A 1981-08-10 1982-07-02 Cabin for spray-coating objects with powder Expired EP0071756B1 (en)

Priority Applications (1)

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AT82105901T ATE22236T1 (en) 1981-08-10 1982-07-02 CABIN FOR SPRAY COATING OF OBJECTS WITH POWDER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3131565 1981-08-10
DE3131565A DE3131565C2 (en) 1981-08-10 1981-08-10 Booth for spray coating objects with powder

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EP0071756A2 EP0071756A2 (en) 1983-02-16
EP0071756A3 EP0071756A3 (en) 1983-11-09
EP0071756B1 true EP0071756B1 (en) 1986-09-17

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EP (1) EP0071756B1 (en)
JP (1) JPS5888071A (en)
AT (1) ATE22236T1 (en)
DE (1) DE3131565C2 (en)
ES (1) ES8305600A1 (en)

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Also Published As

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EP0071756A3 (en) 1983-11-09
ATE22236T1 (en) 1986-10-15
US4471715A (en) 1984-09-18
ES514842A0 (en) 1983-04-16
DE3131565C2 (en) 1984-12-13
JPH0144383B2 (en) 1989-09-27
JPS5888071A (en) 1983-05-26
DE3131565A1 (en) 1983-05-11
EP0071756A2 (en) 1983-02-16
ES8305600A1 (en) 1983-04-16

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