EP0100932B1 - Cabine de pulvérisation de poudre - Google Patents

Cabine de pulvérisation de poudre Download PDF

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Publication number
EP0100932B1
EP0100932B1 EP83107084A EP83107084A EP0100932B1 EP 0100932 B1 EP0100932 B1 EP 0100932B1 EP 83107084 A EP83107084 A EP 83107084A EP 83107084 A EP83107084 A EP 83107084A EP 0100932 B1 EP0100932 B1 EP 0100932B1
Authority
EP
European Patent Office
Prior art keywords
powder
cyclone separators
spray
cyclone
cabin
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
EP83107084A
Other languages
German (de)
English (en)
Other versions
EP0100932A2 (fr
EP0100932A3 (en
Inventor
Gerhard Friedrich Vöhringer
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 AT83107084T priority Critical patent/ATE30125T1/de
Publication of EP0100932A2 publication Critical patent/EP0100932A2/fr
Publication of EP0100932A3 publication Critical patent/EP0100932A3/de
Application granted granted Critical
Publication of EP0100932B1 publication Critical patent/EP0100932B1/fr
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
    • 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
    • B05B14/45—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths using cyclone separators
    • 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
    • B05B14/48—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths specially adapted for particulate material
    • 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
    • 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
    • Y10S55/00—Gas separation
    • Y10S55/46—Spray booths

Definitions

  • the invention relates to a powder spray booth with a device for separating or recovering spray powder from its conveying gas, with an outlet opening arranged on an outlet side of the spray booth, through which the conveying gas with a residual portion of the spray powder not deposited on the workpiece passes through a plurality of cyclone separators integrated into the spray booth is sucked in.
  • cyclone separators are also used to recover powder from the exhaust air from powder spray booths, to which the conveying air carrying the residual powder is usually fed in a rotating manner from above and centrically sucked upwards again, with a large proportion of the residual powder introduced settling at the bottom of the cyclone and can be used there for further use.
  • cyclone separators have the advantage of better cleaning, since practically no powder settles inside their housing.
  • the lower degree of excretion is disadvantageous, especially in the case of fine-grain powder.
  • about 95% of powders with a particle size of 10 microns are recovered. H. only 5% are lost, but with powder dimensions of less than 10 microns, only 60% are recovered.
  • post-filtering is essential for further use.
  • the invention pursues the task of developing the powder spray booth defined at the outset in such a way that, when the coating process is made more uniform, the degree of precipitation on the workpiece increases, while the amount of powder fed to the cyclone separators is reduced.
  • the cabin outlet is designed according to the invention as a horizontal transverse slot arranged near the spray opening near the cabin ceiling, from which at least one suction channel of the cyclone separator starts.
  • Cyclone separators of the same height are preferably arranged in a row next to one another, distributed over at least the majority of the cabin outlet side. It is relatively easy to equalize the cabin flow.
  • the suction channel formed above the cyclone separators can directly adjoin the transverse slot. It can have the same depth and be closed at the back by a flat wall if the individual cyclones are close together. However, if there is an intermediate distance, the cross section of the suction channel can change over its length, in order to make room for other flow paths.
  • the cyclone separators are expediently arranged at a vertical distance above the cabin floor in such a way that residual powder deposited on the cabin floor and the spray powder recovered in the cyclones can be fed to the same collecting space. Except for the inlet and outlet opening, the cyclone separators towards the coating room can also be shielded by a common, smooth surface and therefore easy to clean. 'Z
  • the lock closure arranged at the lower end of a cyclone separator is characterized by closure elements which are connected in series and can be moved alternately between the open and closed positions by means of a common motor-driven support. Such closure elements can then have a relatively large area and move largely perpendicular to the remaining opening gap. In this way, powder particles remaining in the gap are only exposed to a compressive force, but not to a grinding load, as occurs, for example, in cell locks. In addition, the pressure load can be reduced at will, without the risk of leaks in the large sealing surfaces.
  • the two closure elements in particular one that is resiliently adjustable, are attached to one end of a double lever that can be pivoted about a horizontal axis, at the other end of which a periodically actuated actuator acts.
  • Such training is not only simple, but also extremely reliable.
  • a filter unit is installed downstream of the cyclone separators in order to increase the degree of recovery, this can be inserted directly into the spray booth on the outside of the cyclone separator, in particular integrated into this. It is also relatively easy to provide guidance or conveying means for bringing together the amounts of powder separated by the cyclone separator and the filter unit.
  • a switch device is particularly recommended for optional merging or separate discharge of the residual powder quantities recovered by cyclones and filter units.
  • a collecting space for recovered residual powder attached under the filter unit can be connected to a separate collecting space by a first switching element and to a common powder collecting space by a second switching element.
  • Both switch elements can be connected in such a way that each can only be opened in the closed position of the other or that both switch elements, in particular together, can be actuated alternately in opposite directions.
  • An inclined floor arranged under the post-filter unit can be important here, which is inclined towards the cyclones after a common partition wall and has a first outlet flap to a separate collecting space close to the partition wall, while a second outlet flap is attached to the common collecting space in the partition wall close to the inclined floor is.
  • the first outlet flap is advantageously mounted here at its lower end, the second at its upper end.
  • the powder spray booth 1 forms a coating room 2, to which two recovery units, a cyclone unit 3 and a filter unit 4 are connected, both of which are under the action of a suction fan 5.
  • An effective scraping device 7 on the cabin floor 6 conveys into a powder carriage 8 which can be moved through the space 9 from the outside.
  • Through openings 13 for workpieces 14 are formed in the cabin ceiling 11 and in the two end walls 12 of the coating room 2, which may also be connected to the outside, which are each suspended by means of a hanger 15 through a ceiling slot 16 on a circular conveyor 17 and are thus automatically conveyed through the coating space 2 at a uniform speed.
  • This scraper device 7 has a U-shaped scraper 20 which is moved back and forth over the cabin floor by means of a chain 22 driven by a motor 21 and is temporarily lifted off when moving to the left in FIG. 1.
  • the cyclone unit 3, as i.a. 2 also shows five individual cyclone separators 23, i.e. In a known manner, vertically arranged sheet metal containers with an upper cylinder part 24 and a lower acute-angled cone part 25. From the middle of the cylinder part, a tube 26 leads upwards through a transverse suction channel 27 into an overlying connection space 28, from which the air according to arrows 29 into the filter chamber 32 receiving the filter 31 of the filter unit 4 and then sucked in by the suction fan 5 through the filter and expelled again through filter mats 33 according to the arrow.
  • the common suction channel 27 of all cyclone separators 23 is located directly under the cabin ceiling 11 and is directly connected to the coating space 2 by a transverse slot 34, possibly covered by a perforated plate.
  • guide vanes 35 are inserted in the usual manner, which set the air sucked in downward in rotation according to the flow lines 36 before the direction of flow reverses toward the upper tube 26. Since the powder particles do not participate in this reversal movement because of their larger mass, they are removed downward and predominantly fall out of the cone part 25.
  • All cyclone separators 23 are closed off by a common flat cladding wall 37 towards the coating space 2.
  • the air sucked in by the suction fan 5 enters at least approximately horizontally through the spray opening 19 in a somewhat evenly distributed manner according to the flow lines 38 drawn with solid lines. At first, this should be considered It remains clear that, depending on the arrangement and connection of the cabin, additional air volumes can also enter through the through openings 13 and the ceiling slot 16. These secondary flows are of no particular importance for the guidance of the powder on the workpiece. It can therefore be assumed that the powder sprayed by the powder spray gun is transported predominantly horizontally to the workpiece 14 by the sucked-in air and thereby enables a uniform coating. The electrostatic guidance ends behind the workpiece.
  • the filter 31 which can be designed as a large-area pocket filter which is provided with a cleaning device in a known manner.
  • Lock closures 40 are attached to the lower intermediate wall 42, namely that a truncated cone-shaped funnel 44 is detachably flanged under each outlet opening 43 of the kegite egg 25 and forms a second outlet opening 54 with its lower end.
  • Both outlet openings have conical valve elements 45 and 46 which are assigned to a common one Carrier rod 48 are attached, which in turn sits at one end of a double lever 49, at the other end an actuator 51 such as a compressed air cylinder or the like. connected.
  • This double lever 49 is sealed on an axle 52 fixed to the housing.
  • At least one of the valve elements 45 and 46 is also provided to be resiliently adjustable over a limited distance in the direction of the rod 48. This ensures that when the support rod 48 is raised, the valve element 45, for example, first comes into sealing contact with the first outlet opening 43 before the second valve element 46 lifts off the second outlet opening 54. In this way, an air exclusion of the cyclone interior is constantly maintained. The amount of powder accumulated in the bottom region of the cone part 25 during the draining process is immediately entered into the funnel 44 when switching back to the operating position shown.
  • the filter chamber 32 of the filter unit 4 is closed off from the cyclone unit 3 by a rear wall 55 covering all the cyclone separators and downwards to the chamber 9 by an inclined floor 56.
  • a horizontal pivot axis 57 is provided, on which a first outlet flap 58 is attached, which closes a first outlet opening 59 in the inclined floor 56 in the closed position shown and in the opening position 59 'shown in broken lines the same Inclined floor 56 introduces powder sliding down into space 9, in which a further powder container 8 can optionally be attached.
  • a second outlet opening 62 is attached above the swivel axis 57 and a bracket 61 that extends the inclined floor 56 at the lower end of the rear wall 55, which is closed in the manner drawn with solid lines by a second outlet flap 63, but which is about its high-lying swivel axis 64 to can be pivoted into the open position 64 'shown with broken lines.
  • Both flaps 58 and 63 can also be mutually coupled in such a way that only one is always open and the other is closed.
  • the outlet flap 63 If the outlet flap 63 is open, the powder quantities of the cyclone unit and of the filter unit enter the powder container 8, where they are subjected to the common preparation by a sieving machine 65, loosened by means of an air tray 66 and fed directly to the powder spray gun 18 through an injector 67 and hose 68. However, if the outlet flap 58 is opened, the powder recovered from the filter unit 4 by cleaning the filter 31 is fed separately through the outlet opening 59 to a powder carriage 8, not shown and to be arranged in the space 9.
  • a filter unit 4 can be completely dispensed with. So you could place the suction fan 5 directly in the room 28. However, if the filter unit is present, it may be possible that can be driven without filter 31.
  • Such a filter 31 is in any case necessary when working with fine-grained spray powder which, for example, only enables a cyclone recovery rate of 60 to 80%.
  • the downstream filter separation is necessary and, above all, the powder can be separated into coarse-grained and fine-grained powder parts.
  • powder booths equipped with cyclone separators will generally be used for all work with coarse-grained powder, because this simplifies cleaning. Cleaning in the filter unit 4 is much more cumbersome. One can therefore the powder parts filtered out there are lost and successively run different colors, while in the cyclone unit 3 only the smooth surfaces outside the cyclone housing are cleaned. If this principle is used, several cyclone cabins can also be connected to a separate filter unit. Overall, the areas to be cleaned are in any case significantly reduced if the cyclone separators are arranged in the powder spray booth, which is otherwise closed.
  • the manufacturing costs of the small cyclone separators used here are exceptionally small. Still, it can be interesting at some point be to reduce the number of cyclones used. 4, the intermediate distance between the cyclone separators 23 is almost doubled, and the suction space 271 is divided by the cyclones or the pipes 26 surrounding baffles 69, which are cut to form the flow direction 38 according to the flow lines, divided into individual areas, one uniform flow enables whether the guide walls are evenly curved on both sides or spiral-shaped according to the rotation vortex. In this way, approximately the same inflow conditions can be created with a smaller number of cyclones.
  • gusset spaces 71 also remain on the back between the guide plates 69, these gusset spaces can be used to convey the suction air from the high space 28 into the filter space 32.
  • gusset spaces 71 have to be closed towards the lower end by a preferably curved bottom guide plate 72. From the flat rear wall 55 of FIG. 3, only a flat rear strip 551 remains, to which the filter 31 can be moved closer.

Landscapes

  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
  • Cyclones (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Nozzles (AREA)

Claims (15)

11. Cabine de projection de poudre (1) comportant un dispositif pour séparer la poudre de son gaz de transport et la récupérer, une ouverture de sortie (34) qui est située sur une face de sortie de la cabine et à travers laquelle le gaz de transport est aspiré, avec un reste de poudre non déposé sur la pièce à traiter (14), par plusieurs séparateurs à cyclone (23) intégrés à la cabine et dont les ouvertures d'entrée sont ouvertes vers la chambre de pulvérisation (2), caractérisée en ce que l'ouverture de sortie de la cabine est formée par une fente transversale horizontale (34) qui est disposée en face de l'ouverture de projection (19) et à proximité du plafond (11) de la cabine et d'où part au moins un canal d'aspiration (27) des séparateurs à cyclone (23).
2. Cabine selon la revendication 1, caractérisée en ce que les séparateurs à cyclone (23) sont de même hauteur et sont répartis les uns à côté des autres en une rangée sur au moins la majeure partie de la face de sortie de la cabine.
3. Cabine selon la revendication 1 ou 2, caractérisée en ce que le canal d'aspiration (27) prévu au-dessus des séparateurs à cyclone (23) est directement adjacent à ladite fente transversale (34).
4. Cabine selon la revendication 1, 2 ou 3, caractérisée en ce que les séparateurs à cyclone (23) présentent un écartement vertical par rapport au fond (6) de la cabine, de telle manière qu'un reste de poudre déposé sur le fond de la cabine et la poudre récupérée dans les cyclones (23) puissent être conduits dans un collecteur commun (8).
5. Cabine selon l'une des revendications 1 à 4, caractérisée en ce que les séparateurs à cyclone (23) sont protégés, du côté de la chambre de pulvérisation (2), par un écran commun lisse (37) s'étendant entre leur entrée et leur sortie.
6. Cabine selon la revendication 1, comportant un sas à l'extrémité inférieure d'un séparateur à cyclone, caractérisée par des éléments de fermeture (45-46) disposés l'un après l'autre et mobiles alternativement entre une position d'ouverture et une position de fermeture au moyen d'un support commun (48) actionné par un moteur.
7. Cabine selon la revendication 6, caractérisée en ce que les deux éléments de fermeture (45, 46) sont montés, de préférence d'une manière élastique l'un par rapport à l'autre, à une extrémité d'un levier double (49) basculant autour d'un axe horizontal (52) et dont l'autre extrémité est raccordée à un organe de commande (51) actionné périodiquement.
8. Cabine selon l'une des revendications 1 à 7, comportant un bloc de filtration après les séparateurs à cyclone (23), caractérisée en ce que le bloc de filtration (4) est accolé directement à la cabine (1) du côté extérieur des séparateurs (23), et de préférence est intégré à la cabine.
9. Cabine selon la revendication 8, caractérisé par des moyens de guidage ou de transport (56-63) pour rassembler les diverses quantités de poudre récupérées par les séparateurs à cyclone (23) et par le bloc de filtration (4).
10. Cabine selon la revendication 9, caractérisée par un dispositif d'aiguillage (58, 63) pour effectuer à choix un regroupement ou une évacuation séparée des restes de poudre récupérés par les séparateurs à cyclone (23) et par le bloc de filtration (4).
11. Cabine selon la revendication 10, caractérisée en ce qu'une chambre (32) de réception de poudre récupérée, disposée sous le bloc de filtration (4), est mise en communication avec un collecteur séparé (9) par un premier élément d'aiguillage (58), et avec un collecteur de poudre commun (8) par un second élément d'aiguillage (63).
12. Cabine selon la revendication 11, caractérisée en ce que les deux éléments d'aiguillage (58, 63) sont associés de manière que chacun d'eux ne puisse s'ouvrir que lorsque l'autre est fermé.
13. Cabine selon la revendication 11 ou 12, caractérisée en ce que les deux éléments d'aiguillage (58, 63) sont actionnés alternativement dans des sens contraires et de préférence par une commande commune.
14. Cabine selon l'une des revendications 10 à 13, caractérisée en ce qu'elle comporte sous le bloc de filtration (31) un fond (56) qui est incliné en direction d'une cloison (55) séparant ce bloc des cyclones (23) et qui comporte à proximité immédiate de cette cloison une première trappe (58) d'évacuation vers un collecteur séparé (9), tandis que ladite cloison (55) comporte à proximité immédiate de ce fond incliné (56) une seconde trappe (63) d'évacuation vers un collecteur commun (8).
15. Cabine selon la revendication 14, caractérisée en ce que la première trappe (58) est articulée sur son bord inférieur, et la seconde (63) sur son bord supérieur.
EP83107084A 1982-08-10 1983-07-20 Cabine de pulvérisation de poudre Expired EP0100932B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83107084T ATE30125T1 (de) 1982-08-10 1983-07-20 Pulverspruehkabine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823229756 DE3229756A1 (de) 1982-08-10 1982-08-10 Pulverspruehkabine
DE3229756 1982-08-10

Publications (3)

Publication Number Publication Date
EP0100932A2 EP0100932A2 (fr) 1984-02-22
EP0100932A3 EP0100932A3 (en) 1985-05-29
EP0100932B1 true EP0100932B1 (fr) 1987-10-07

Family

ID=6170531

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83107084A Expired EP0100932B1 (fr) 1982-08-10 1983-07-20 Cabine de pulvérisation de poudre

Country Status (4)

Country Link
US (1) US4504292A (fr)
EP (1) EP0100932B1 (fr)
AT (1) ATE30125T1 (fr)
DE (2) DE3229756A1 (fr)

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CN110420790B (zh) * 2019-08-01 2021-01-12 张家港市宏基精密铝材科技有限公司 一种环保型铝型材加工用喷涂装置
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Also Published As

Publication number Publication date
EP0100932A2 (fr) 1984-02-22
ATE30125T1 (de) 1987-10-15
DE3229756A1 (de) 1984-02-16
US4504292A (en) 1985-03-12
DE3373985D1 (en) 1987-11-12
EP0100932A3 (en) 1985-05-29

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