EP1624970B1 - Electrostatic-painting system for metallic manufactured articles and associated method - Google Patents

Electrostatic-painting system for metallic manufactured articles and associated method Download PDF

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Publication number
EP1624970B1
EP1624970B1 EP04739143A EP04739143A EP1624970B1 EP 1624970 B1 EP1624970 B1 EP 1624970B1 EP 04739143 A EP04739143 A EP 04739143A EP 04739143 A EP04739143 A EP 04739143A EP 1624970 B1 EP1624970 B1 EP 1624970B1
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EP
European Patent Office
Prior art keywords
conveyor
hangers
manufactured articles
painting
booth
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
EP04739143A
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German (de)
French (fr)
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EP1624970A1 (en
Inventor
Giovanni Bortolato
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.)
Lasa Impianti Srl
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Lasa Impianti Srl
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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
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/0221—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work characterised by the means for moving or conveying the objects or other work, e.g. conveyor belts
    • B05B13/0264—Overhead conveying means, i.e. the object or other work being suspended from the conveying means; Details thereof, e.g. hanging hooks
    • 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
    • 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
    • B05B16/80—Movable spray booths
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
    • B05C9/14—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating or cooling

Definitions

  • the present invention relates to an electrostatic-painting system for metallic manufactured articles such as aluminum sections, sheet, metallic structures and the like and to a method making use of such a system.
  • EP-A-0 980 716 discloses a painting system wherein a overhead conveyor for hangers and a further conveyor for floor carriers are present, with transfer means for transferring the workpieces from the first to the second conveyor, WO 02/072284 discloses a known arrangement of different, consecutive conveyors.
  • the general purpose of the present invention is to remedy the above mentioned shortcomings by making available a system and method for electrostatic painting of metallic manufactured articles with powders, which system and method would allow high hourly production (25 hangers per hour similar to or higher than a horizontal system) with a small system (similar to a compact system), and with limited used of labor while operating under optimal environmental conditions.
  • FIG 1 shows a preferred embodiment of the electrostatic-painting system 10 comprising the overhead loading conveyor 11, the overhead heat-treatment conveyor 12, the unloading overhead conveyor 13, the overhead transfer conveyor 14, the hot air bell-oven 15, the painting device 16 and the supporting structure 17.
  • the conveyors 11, 12, 13, and 14 consist of two parallel chains (not shown) handled at the same speed.
  • To the conveyors 11, 12, 13 and 14 are hooked a plurality of hangers 18 designed to support the manufactured metallic articles 19 to be painted.
  • the loading conveyor 11, the unloading conveyor 13 and the heat-treatment conveyor 12 are accumulating conveyors that allow accumulation of a plurality of hangers in the loading zone, the unloading zone and the oven 15 respectively.
  • the conveyor 12 is placed in the oven 15 while the unloading conveyor 13 and the loading conveyor 11 are outside the oven 15 near the outlet 21 and inlet 20 openings respectively of the oven. These openings 20 and 21 are positioned on the lower side of the bell oven 15.
  • the overhead conveyor 14 is a transfer conveyor connecting the three accumulation conveyors 11, 12, 13 in a closed loop.
  • the conveyor 14 has purposeful hooking and unhooking systems and at each step deposits and takes a part-carrying hanger 18 from each of the three accumulation conveyors 11, 12, 13.
  • the connection between the unloading conveyor 13 and the loading conveyor 12 passes above the oven 15 as shown in FIG 1.
  • the supporting structure 17 holds up the oven 15 in a superelevated position above the conveyors 11 and 13 and over the painting device 16.
  • the oven 15 has dimensions such as to contain about ten hangers 18.
  • the painting device 16 is positioned between the loading conveyor 11 and the oven inlet 20.
  • FIG 2 shows in detail a plan view of the painting device 16.
  • This device includes a booth-carrier platform 30, two painting booths 31a and 31b, air suction means 32, a suction channel 33 and electronic translation speed control means for the booths 41 and suction intensity 40.
  • Each booth 31a and 31b has two powder dispensers 34 for spraying metallic manufactured articles hung on the hangers 18.
  • the booths have wheels 35 for translation from one part to the other of the booth-carrier platform 30 on a purposeful path so as to receive the hangers 18 in the booths in the space included between the two dispensers 34.
  • the powder dispensers 34 are rectilinear in form and placed in a vertical position. They are inclined at an angle between 0° and 60° to the direction perpendicular to the booth translation direction.
  • the translation path on the booth-carrier platform 30 is sufficiently long to allow one of the two booths, no. 31b, to stop in a rest position without interfering with the translational motion of the other booth 31a that is in the painting step.
  • the suction channel 33 connects the suction means 32 with the entire painting booth running path along the booth-carrier platform 30 as shown in the figure.
  • the channel 33 is normally closed on the platform 30 side and is opened at the position of the painting booth 31 so as to suck air only in the actual painting zone.
  • the manufactured articles 19 are loaded manually onto the hangers 18 on the loading conveyor 11 that accumulates them in the inlet zone. Then the manufactured articles are sprayed with powder in the painting device 16.
  • the painting booth 31a in translating from one side to the other of the booth-carrier platform 30, receives the hangers 18 and the manufactured metallic article 19 in the space included between the two dispensers 34 which spray electrostatically charged powder over the entire surface of the manufactured articles 19.
  • a sliding device (not shown in the figure) opens the suction channel 33 normally closed on passage of the booth 31a so that the painting powders are recovered and the direction of flow of the painting powders is optimized. Said powders are sprayed at an optimal angle thanks to the inclination of the dispensers 34.
  • the booth translation speed control means 41 make it possible to have high speed during arrival and leaving from the spraying zone and to adjust speed during spraying depending on the type of parts.
  • the suction intensity control means 40 allow increase of suction in the spraying step so as to optimize power consumption of the suction means 32.
  • the manufactured articles 19 After being sprayed with the powders, the manufactured articles 19 enter through the opening 20 into the oven 15 for polymerization.
  • the oven 15 the manufactured articles are received on the accumulation conveyor 12.
  • the oven 15 can contain about ten hangers 18 to allow simultaneous polymerization of a plurality of metallic manufactured articles 19.
  • Heat treatment lasts between 15' and 30' and, once completed, the manufactured articles 19 come out of the oven through the opening 21 to be received on the unloading accumulation conveyor 13.
  • the manufactured articles 19 stop on the unloading conveyer 13 long enough to cool and allowing the operators to work under safe environmental conditions.
  • the hangers 18 Once unloaded, the hangers 18 are automatically carried back to the inlet conveyor 11 by means of the overhead transfer conveyor 14. The hangers can now be reloaded for another processing cycle.
  • FIG 3 shows an alternative embodiment of the system in accordance with the present invention.
  • Said embodiment 110 comprises, similarly to the above described embodiment, a loading conveyor 111, a painting device 116, a heat-treatment conveyor 112, a hot-air bell-oven 115, an unloading conveyor 113, an overhead conveyor 114 for transfer of the hangers 118 hookable to the conveyors 111, 112, 113, 114.
  • the alternative embodiment comprises in addition a pretreatment system 150 for the manufactured articles.
  • This system 150 comprises the anodizing (or chromium plating) tanks 151, the rinsing tank 152 and the drying tank 153.
  • the pretreatment system 150 is fitted between the loading conveyor 111 and the painting device 116 as shown in the figure.
  • the efficiency of the system is further improved by the capability of cleaning one of the two painting booths off-line without interrupting the manufacturing process which continues by making use of the other booth. Power consumption is also optimized thanks to complete utilization of the bell oven and reduced used of power for treatment of the inner atmosphere of the booth thanks to selective air suction in the spraying zone.

Landscapes

  • Spray Control Apparatus (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

A system for electrostatic painting of metallic manufactured articles comprises a conveyor system for a plurality of hangers (18) designed to carry the metallic manufactured articles (19) and a painting device (16) for the manufactured articles (19) and an oven (15) traversed by said conveyor system. The conveyor system comprises a first conveyor (11) for accumulation outside of the oven (15) for loading of the hangers (18), a second conveyor (13) for accumulation outside of the oven (15) for unloading of the hangers (18), a third conveyor (12) for accumulation inside the oven (15), and a fourth conveyor (14) connecting the first three conveyors (11, 12, 13) for transfer of the hangers (18) among them. A method for electrostatic painting of metallic manufactured articles making use of the above mentioned system.

Description

  • The present invention relates to an electrostatic-painting system for metallic manufactured articles such as aluminum sections, sheet, metallic structures and the like and to a method making use of such a system.
  • As known, there are different types of systems for painting aluminum sections while those commonly used are of three types, to wit:
    • Vertical systems using the technique of vertical suspension of the aluminum sections. These systems have the advantage of high productivity with limited labor but the disadvantage of high cost, high energy consumption, much maintenance and difficult control of pretreatment before painting because the inline oven with two input-output mouths loses much heat with high energy consumption;
    • Horizontal systems using the horizontal suspension technique for the aluminum sections. These systems have fair productivity (up to 25 hangers per hour), allow pretreatment off the line and are thus easy to control and display easy loading and unloading of the parts with accumulation zones. The disadvantages of such systems is in the use of an inline or accumulation oven which, having two input-output mouths, loses a large amount of heat with high energy consumption. In addition, for color change it is necessary to keep two or three empty hangers for translation of the two booths or, with fixed booths, it is necessary to have an additional space for the two-rail conveyor. The space occupied by the system is very great in relation to productivity; and
    • Compact systems ( Italian Patent No. 01244788 of 29th August 1994) which are equipped with two parallel conveyors on which are fixed the hangers which carry the aluminum sections fastened horizontally. These systems have the advantages of occupying limited space, having a bell oven that consumes little energy, and one or two small painting booths. In this case the disadvantages are very low productivity, difficulty of loading and unloading parts, and having to work with the oven positioned over the heads of the operators and the poor safety for the operators who have to work in an environment with hanging bars which could fall during handling. The parts must be unloaded from the hangers while they are still very hot with clearly unfavorable working conditions for the operators. In addition, as the hangers are mounted on the overhead conveyors at the same pitch for all and it is not possible to have a small wheelbase because allowance must be made for passage of the booth for painting and space for the loading and unloading operators, a limited number of hangers can stay in the oven (usually 3 or 4) without optimizing use of the oven; these systems are thus suited for production of small lots since they can produce a maximum of 12 hangers per hour.
  • EP-A-0 980 716 discloses a painting system wherein a overhead conveyor for hangers and a further conveyor for floor carriers are present, with transfer means for transferring the workpieces from the first to the second conveyor, WO 02/072284 discloses a known arrangement of different, consecutive conveyors.
  • The general purpose of the present invention is to remedy the above mentioned shortcomings by making available a system and method for electrostatic painting of metallic manufactured articles with powders, which system and method would allow high hourly production (25 hangers per hour similar to or higher than a horizontal system) with a small system (similar to a compact system), and with limited used of labor while operating under optimal environmental conditions.
  • In view of this purpose it was sought to provide in accordance with the present invention a system for electrostatic painting of metallic manufactured articles as claimed by claim 1.
  • Again in accordance with the present invention it was sought to realize a method for electrostatic painting of metallic manufactured articles as claimed by claim 18.
  • To clarify the explanation of the innovative principles of the present invention and its advantages compared with the prior art there is described below with the aid of the annexed drawings a possible embodiment thereof by way of non-limiting example applying said principles. In the drawings:
    • FIG 1 shows an overall side view of a realization of the system in accordance with the present invention;
    • FIG 2 shows a plan view of the painting device; and
    • FIG 3 shows an overall side view of an alternative realization of the system in accordance with the present invention.
  • With reference to the figures, FIG 1 shows a preferred embodiment of the electrostatic-painting system 10 comprising the overhead loading conveyor 11, the overhead heat-treatment conveyor 12, the unloading overhead conveyor 13, the overhead transfer conveyor 14, the hot air bell-oven 15, the painting device 16 and the supporting structure 17. The conveyors 11, 12, 13, and 14 consist of two parallel chains (not shown) handled at the same speed. To the conveyors 11, 12, 13 and 14 are hooked a plurality of hangers 18 designed to support the manufactured metallic articles 19 to be painted. The loading conveyor 11, the unloading conveyor 13 and the heat-treatment conveyor 12 are accumulating conveyors that allow accumulation of a plurality of hangers in the loading zone, the unloading zone and the oven 15 respectively. The conveyor 12 is placed in the oven 15 while the unloading conveyor 13 and the loading conveyor 11 are outside the oven 15 near the outlet 21 and inlet 20 openings respectively of the oven. These openings 20 and 21 are positioned on the lower side of the bell oven 15. The overhead conveyor 14 is a transfer conveyor connecting the three accumulation conveyors 11, 12, 13 in a closed loop. The conveyor 14 has purposeful hooking and unhooking systems and at each step deposits and takes a part-carrying hanger 18 from each of the three accumulation conveyors 11, 12, 13. The connection between the unloading conveyor 13 and the loading conveyor 12 passes above the oven 15 as shown in FIG 1. The supporting structure 17 holds up the oven 15 in a superelevated position above the conveyors 11 and 13 and over the painting device 16. The oven 15 has dimensions such as to contain about ten hangers 18. The painting device 16 is positioned between the loading conveyor 11 and the oven inlet 20.
  • FIG 2 shows in detail a plan view of the painting device 16. This device includes a booth-carrier platform 30, two painting booths 31a and 31b, air suction means 32, a suction channel 33 and electronic translation speed control means for the booths 41 and suction intensity 40. Each booth 31a and 31b has two powder dispensers 34 for spraying metallic manufactured articles hung on the hangers 18. The booths have wheels 35 for translation from one part to the other of the booth-carrier platform 30 on a purposeful path so as to receive the hangers 18 in the booths in the space included between the two dispensers 34. The powder dispensers 34 are rectilinear in form and placed in a vertical position. They are inclined at an angle between 0° and 60° to the direction perpendicular to the booth translation direction. The translation path on the booth-carrier platform 30 is sufficiently long to allow one of the two booths, no. 31b, to stop in a rest position without interfering with the translational motion of the other booth 31a that is in the painting step. The suction channel 33 connects the suction means 32 with the entire painting booth running path along the booth-carrier platform 30 as shown in the figure. The channel 33 is normally closed on the platform 30 side and is opened at the position of the painting booth 31 so as to suck air only in the actual painting zone.
  • We shall now describe the painting process that uses the system 10.
  • The manufactured articles 19 are loaded manually onto the hangers 18 on the loading conveyor 11 that accumulates them in the inlet zone. Then the manufactured articles are sprayed with powder in the painting device 16. The painting booth 31a, in translating from one side to the other of the booth-carrier platform 30, receives the hangers 18 and the manufactured metallic article 19 in the space included between the two dispensers 34 which spray electrostatically charged powder over the entire surface of the manufactured articles 19. A sliding device (not shown in the figure) opens the suction channel 33 normally closed on passage of the booth 31a so that the painting powders are recovered and the direction of flow of the painting powders is optimized. Said powders are sprayed at an optimal angle thanks to the inclination of the dispensers 34. While the booth 31a is in the spraying step, the other booth 31b is available for cleaning and color change. The booth translation speed control means 41 make it possible to have high speed during arrival and leaving from the spraying zone and to adjust speed during spraying depending on the type of parts. The suction intensity control means 40 allow increase of suction in the spraying step so as to optimize power consumption of the suction means 32.
  • After being sprayed with the powders, the manufactured articles 19 enter through the opening 20 into the oven 15 for polymerization. In the oven 15 the manufactured articles are received on the accumulation conveyor 12. The oven 15 can contain about ten hangers 18 to allow simultaneous polymerization of a plurality of metallic manufactured articles 19. Heat treatment lasts between 15' and 30' and, once completed, the manufactured articles 19 come out of the oven through the opening 21 to be received on the unloading accumulation conveyor 13. Before being unhooked from the hangers 18, the manufactured articles 19 stop on the unloading conveyer 13 long enough to cool and allowing the operators to work under safe environmental conditions. Once unloaded, the hangers 18 are automatically carried back to the inlet conveyor 11 by means of the overhead transfer conveyor 14. The hangers can now be reloaded for another processing cycle.
  • FIG 3 shows an alternative embodiment of the system in accordance with the present invention. Said embodiment 110 comprises, similarly to the above described embodiment, a loading conveyor 111, a painting device 116, a heat-treatment conveyor 112, a hot-air bell-oven 115, an unloading conveyor 113, an overhead conveyor 114 for transfer of the hangers 118 hookable to the conveyors 111, 112, 113, 114. The alternative embodiment comprises in addition a pretreatment system 150 for the manufactured articles. This system 150 comprises the anodizing (or chromium plating) tanks 151, the rinsing tank 152 and the drying tank 153. The pretreatment system 150 is fitted between the loading conveyor 111 and the painting device 116 as shown in the figure.
  • After having described two embodiments of the present invention, the numerous advantages obtained as compared with the prior art such as high hourly production, limited use of space and excellent environmental conditions for the operators appear to be evident. Indeed, considering that the bell oven can receive up to ten part-carrying hangers and that polymerization time for the metallic manufactured articles varies between 15' and 30', an hourly production of approximately 25 to 30 hangers per hour is achieved, which is higher than the hourly production achievable with the prior art systems. Again, use of space is limited in relation to productivity since use of the bell oven is optimized thanks to the particular shape of the system embodiment realized. In addition, accumulation of the hangers leaving the oven on the unloading conveyor allows cooling of the manufactured articles painted and polymerized before intervention of the operators in the unloading zone. In this manner, the working environment is safer. The efficiency of the system is further improved by the capability of cleaning one of the two painting booths off-line without interrupting the manufacturing process which continues by making use of the other booth. Power consumption is also optimized thanks to complete utilization of the bell oven and reduced used of power for treatment of the inner atmosphere of the booth thanks to selective air suction in the spraying zone.
  • Naturally the above description of an embodiment applying the innovative principles of the present invention is given by way of non-limiting example of said principles within the scope of the exclusive right claimed here.

Claims (21)

  1. System for electrostatic painting of metallic manufactured articles comprising:
    - a conveyor system for a plurality of hangers (18, 118) designed to carry metallic manufactured articles (19, 119); and
    - a painting device (16, 116) for the manufactured articles and an oven (15, 115) traversed by said conveyor system for processing of the manufactured articles (19, 119) carried by the hangers (18, 118);
    characterized in that the conveyor system comprises:
    - a first conveyor (11, 111), or loading conveyor, for accumulation of the hangers (18, 118) outside and upstream of the oven (15, 115) for loading of the manufactured articles (19, 119) onto the hangers (18, 118);
    - a second conveyor (13, 113), or unloading conveyor, for accumulation of the hangers (18, 118) outside and downstream of the oven (15, 115) for unloading of the manufactured articles (19, 119) from the hangers (18, 118);
    - a third conveyor (12, 112), or heat-treatment conveyor, for accumulation of the hangers (18, 118) inside the oven (15, 115); and
    - a fourth conveyor (14, 114), or transfer conveyor, connecting said first, second and third conveyors (11, 12, 13, 111, 112, 113) for transferring the hangers (18, 118) between them.
  2. System according to claim 1, characterized in that said fourth conveyor (14, 114) connects the unloading conveyor (13, 113) to the loading conveyor (11, 111) passing over the oven (15, 115).
  3. System according to claim 1, characterized in that the four conveyors (11, 12, 13, 14, 111, 112, 113, 114) are each made up of two parallel chains and move in step at the same speed.
  4. System according to claim 1, characterized in that the oven (15, 115) is of hot-air bell type.
  5. System according to claim 4, characterized in that the oven (15, 115) can contain more than one hanger (18, 118).
  6. System according to claim 4, characterized in that the bell-type oven (15, 115) has an opening (20) for entry and an opening (21) for exit of the hangers (18, 118) on the lower side thereof.
  7. System according to claim 1, characterized in that the painting device (16, 116) is traversed by said fourth transfer conveyor (14, 114) and is positioned between the loading conveyor (11, 111) and the heat-treatment conveyor (12, 112) in the oven (15, 115), with said painting device (16, 116) comprising a booth-carrier platform (30), at least two painting booths (31a, 31b) for the manufactured articles (19, 119), which are mounted movably on said platform (30), and suction means (32) connected to the painting booths (31a, 31b) for treatment of the internal atmosphere of the booth.
  8. System according to claim 7, characterized in that the painting booths (31a, 31b) have means for translation onto the booth-carrier platform (30) in a direction parallel to a row of hangers (18, 118) and to receive said hangers (18, 118) inside them during the translation motion.
  9. System according to claim 7, characterized in that each painting booth (31a, 31b) has in it two rectilinear and vertical powder dispensers (34) operating on opposite sides of the manufactured articles (19, 119) in the spraying step.
  10. System according to claim 9, characterized in that the two dispensers (34) of each painting booth (31a, 31b) are inclined at an angle between 0° and 60° to the direction perpendicular to the translation direction of the booth (31a, 31b).
  11. System according to claim 7, characterized in that the suction means (32) are fixed in relation to the booth-carrier platform (30) and outside it.
  12. System according to claim 11, characterized in that the suction means (32) are connected to the booth-carrier platform (30) by means of a suction channel (33) extending along the entire running path of the painting booths (31a, 31b) on said booth-carrier platform (30).
  13. System according to claim 12, characterized in that said suction channel (33) is normally closed on the side of the booth-carrier platform (30) and is opened upon passage of the booth (31a, 31b) by a sliding device to put the air suction means (32) selectively in communication with the atmosphere of the painting booths (31a, 31b).
  14. System according to claim 7, characterized in that the two painting booths (31a, 31b) are guided on a single path on the platform (30) and the run of the booths (31a, 31b) is ample to the point of allowing at its ends stopping of one (31b) of the two booths in a rest position for cleaning while the other booth (31a) is in the spraying step.
  15. System according to claim 7, comprising a control means (41) of translation speed of the painting booths.
  16. System according to claim 7, characterized by comprising control means (40) of booth internal air suction intensity.
  17. System according to claim 1, characterized by comprising a sub-system (150) for pretreatment of the manufactured articles (119) positioned between the loaded conveyor (111) and the painting device (116).
  18. Method for electrostatic painting of metallic manufactured articles using the system according to claim 1, comprising the following steps:
    - loading the metallic manufactured articles (19, 119) onto hangers (18, 118) on the loading conveyor (11, 111) outside and upstream of the oven (15, 115);
    - spraying the metallic manufactured articles (19, 119) with electrostatically charged powders;
    - transferring the painted manufactured articles (19, 119) onto the heat-treatment conveyor (12, 112) inside the oven (15, 115);
    - heating the metallic manufactured articles (19, 119) until complete polymerization of the powders;
    - transferring the polymerized manufactured articles (19, 119) onto the unloading conveyor (13, 113) outside and downstream of the oven (15, 115);
    - unloading the manufactured articles (19, 119) from the hangers (18, 118) at said unloading conveyor (13, 113); and
    - transferring the unloaded hangers (18, 118) from the unloading conveyor (13, 113) to the loading conveyor (11, 111) automatically by means of the transfer conveyor (14, 114).
  19. Method according to claim 18, characterized in that the hangers (18, 118) stop on the unloading conveyor (13, 113) long enough for cooling of the manufactured articles (19, 119) before being manually unloaded from the painting system.
  20. Method according to claim 18, characterized in that in the spraying step a single painting booth (31a) is used, with the other booth (32b) being available for cleaning and color change.
  21. Method according to claim 18, characterized in that there is a pretreatment step with tanks between the charging step and the powder-spraying step.
EP04739143A 2003-05-20 2004-05-06 Electrostatic-painting system for metallic manufactured articles and associated method Expired - Lifetime EP1624970B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT001007A ITMI20031007A1 (en) 2003-05-20 2003-05-20 ELECTROSTATIC PAINTING SYSTEM FOR METAL MANUFACTURES AND RELATED METHOD.
PCT/EP2004/004828 WO2004103573A1 (en) 2003-05-20 2004-05-06 Electrostatic-painting system for metallic manufactured articles and associated method

Publications (2)

Publication Number Publication Date
EP1624970A1 EP1624970A1 (en) 2006-02-15
EP1624970B1 true EP1624970B1 (en) 2007-06-27

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EP04739143A Expired - Lifetime EP1624970B1 (en) 2003-05-20 2004-05-06 Electrostatic-painting system for metallic manufactured articles and associated method

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EP (1) EP1624970B1 (en)
AT (1) ATE365589T1 (en)
DE (1) DE602004007260D1 (en)
ES (1) ES2288684T3 (en)
IT (1) ITMI20031007A1 (en)
WO (1) WO2004103573A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110743734A (en) * 2019-11-28 2020-02-04 淮北九略企业管理咨询有限公司 Aluminum profile spraying system

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CN112495667A (en) * 2020-11-26 2021-03-16 德清恒凌五金有限公司 Spraying device for manufacturing and processing hardware
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ATE365589T1 (en) 2007-07-15
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DE602004007260D1 (en) 2007-08-09
ES2288684T3 (en) 2008-01-16
WO2004103573A1 (en) 2004-12-02

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