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.
• 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.
• 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.
• a system for electrostatic painting of metallic manufactured articles comprising a conveyor system for a plurality of hangers designed to carry the metallic manufactured articles and a painting device for the manufactured articles and an oven traversed by said conveyor system for the processing of the manufactured articles and characterized in that the conveyor system comprises the following items :
• a first conveyor for accumulation outside and upstream of the oven for loading of the hangers
• a second conveyor for accumulation outside and downstream of the oven for unloading of the hangers
• 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
• FIG 3 shows an overall side view of an alternative realization of the system in accordance with the present invention.
• 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.
• 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 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.

Landscapes

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

Applications Claiming Priority (2)

Publications (2)

Family

ID=33463050

Family Applications (1)

Country Status (6)

Cited By (1)

Families Citing this family (11)

Family Cites Families (7)

• 2003
  • 2003-05-20 IT IT001007A patent/ITMI20031007A1/it unknown
• 2004
  • 2004-05-06 ES ES04739143T patent/ES2288684T3/es not_active Expired - Lifetime
  • 2004-05-06 DE DE602004007260T patent/DE602004007260D1/de not_active Expired - Lifetime
  • 2004-05-06 AT AT04739143T patent/ATE365589T1/de not_active IP Right Cessation
  • 2004-05-06 WO PCT/EP2004/004828 patent/WO2004103573A1/en not_active Ceased
  • 2004-05-06 EP EP04739143A patent/EP1624970B1/de not_active Expired - Lifetime

Non-Patent Citations (1)

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