WO2017141964A1 - Appareil de revêtement du type à tête d'atomiseur rotative - Google Patents

Appareil de revêtement du type à tête d'atomiseur rotative Download PDF

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Publication number
WO2017141964A1
WO2017141964A1 PCT/JP2017/005520 JP2017005520W WO2017141964A1 WO 2017141964 A1 WO2017141964 A1 WO 2017141964A1 JP 2017005520 W JP2017005520 W JP 2017005520W WO 2017141964 A1 WO2017141964 A1 WO 2017141964A1
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WO
WIPO (PCT)
Prior art keywords
atomizing head
rotary atomizing
shaping air
air ejection
air
Prior art date
Application number
PCT/JP2017/005520
Other languages
English (en)
Japanese (ja)
Inventor
山田　幸雄
Original Assignee
Abb株式会社
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 Abb株式会社 filed Critical Abb株式会社
Priority to JP2018500154A priority Critical patent/JP6434676B2/ja
Publication of WO2017141964A1 publication Critical patent/WO2017141964A1/fr

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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
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B05B5/0403—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member
    • B05B5/0407—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member with a spraying edge, e.g. like a cup or a bell
    • 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
    • B05B12/16—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area
    • B05B12/18—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area using fluids, e.g. gas streams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B05B5/0426—Means for supplying shaping gas

Definitions

  • the present invention relates to a rotary atomizing head type coating machine for spraying paint from a rotary atomizing head rotating at high speed toward an object to be coated.
  • a rotary atomizing head type coating machine includes an air motor that rotates a rotating shaft when supplied with compressed air, and a cylindrical body provided on the front side of the rotating shaft, and is supplied while rotating by the air motor.
  • a rotary atomizing head that sprays the applied paint from the discharge edge of the front end, and an outer peripheral side of the rotary atomizing head, and shaping air is jetted toward the paint particles sprayed from the rotary atomizing head at the front end
  • a plurality of air ejection holes are formed including a shaping air ejection member provided over the entire circumference in the circumferential direction (Patent Document 1).
  • the rotary atomizing head is rotated at a high speed by an air motor, and the paint is supplied to the rotary atomizing head in this state.
  • the coating material supplied to the rotary atomizing head is atomized by the centrifugal force when the rotary atomizing head rotates, and sprayed as coating particles from the discharge edge.
  • the shaping air ejection member sprays the shaping air ejected from each air ejection hole onto the paint particles.
  • the shaping air controls the motion vector component of the paint particles in the direction of the object, and arranges the spray pattern of the paint particles into a desired shape.
  • the present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a rotary atomizing head type coating machine capable of suppressing the adhesion of paint to a shaping air ejection member. is there.
  • the present invention comprises an air motor that rotates a rotating shaft when supplied with compressed air, and a cylindrical body that is provided on the front side of the rotating shaft, and discharges paint supplied while rotating by the air motor to the front end.
  • a rotary atomizing head that sprays from the edge, and a plurality of air ejection holes that are arranged on the outer peripheral side of the rotary atomizing head and that eject shaping air toward the paint particles sprayed from the rotary atomizing head at the front end
  • the rotary atomizing head type coating machine configured to include a shaping air ejection member provided over the entire circumference in the circumferential direction, the front portion of the shaping air ejection member is connected to the outer surface of the front portion.
  • An annular flange member extending outward in the radial direction is provided integrally or separately from the shaping air ejection member.
  • the present invention it is possible to prevent the sprayed paint from flowing around to the rear side of the rotary atomizing head, and to suppress adhesion of the paint to the shaping air ejection member.
  • FIG. 1 to 3 show a first embodiment of the present invention.
  • a case where an annular flange member is integrally provided on the outer peripheral surface of the front portion of the shaping air ejection member will be described as an example.
  • the direction close to the object to be coated is the front side, and the object is separated from the object on the opposite side to the front side.
  • the arrangement relationship will be described with the rear direction as the rear side.
  • a rotary atomizing head type coating machine 1 (hereinafter simply referred to as a coating machine 1) according to the first embodiment indirectly receives paint sprayed from a rotary atomizing head 4 by an external electrode member 6 described later. It is configured as a rotary atomizing head type electrostatic coating machine of an indirect charging system in which a negative polarity is charged.
  • the painting machine 1 is attached to the tip of an arm (not shown) of a painting robot, for example.
  • the coating machine support 2 surrounds the air motor 3 on the outer peripheral side of the air motor 3 to be described later and is provided to extend rearward from the air motor 3.
  • the coating machine support 2 is attached to the tip of the arm described above via the attachment cylinder portion 2A on the base end side.
  • the coating machine support 2 is made of, for example, a rigid insulating resin material.
  • a motor housing portion 2B is provided at the front end side of the coating machine support 2 so as to open forward.
  • a female screw portion 2C is provided on the opening side of the motor housing portion 2B.
  • the coating machine support 2 is provided with an insertion hole 2D into which a proximal end side of a feed tube 5 described later is inserted at a central position (coaxial with a rotation shaft 3C described later) of the bottom of the motor housing 2B. ing.
  • the air motor 3 is provided in the motor housing portion 2B of the coating machine support 2.
  • the air motor 3 rotates a rotating shaft 3C and a rotary atomizing head 4 (described later) at a high speed of 3000 to 150,000 rpm, for example, using compressed air as a power source.
  • the air motor 3 is made of a conductive metal material including, for example, an aluminum alloy, and is held at a ground potential.
  • the air motor 3 includes a stepped cylindrical motor case 3A attached to the front side of the coating machine support 2 and a turbine 3B of, for example, an impeller type that is rotatably located near the rear side of the motor case 3A. And a rotating shaft 3C that is rotatably provided at the axial center position of the motor case 3A and that extends in the front and rear directions and is attached to the turbine 3B.
  • the motor case 3A of the air motor 3 is formed as a cylindrical body arranged coaxially with the rotating shaft 3C.
  • the motor case 3A is a stepped cylinder by a large-diameter large-diameter cylinder 3A1 inserted into the motor housing 2B of the coating machine support 2 and a small-diameter small-diameter cylinder 3A2 protruding forward from the large-diameter cylinder 3A1. It is formed in a shape.
  • the motor case 3A is inserted into the motor housing portion 2B of the coating machine support 2. In this state, the motor case 3A is fixed in the motor housing portion 2B by an annular screw member 3D screwed to the female screw portion 2C of the coating machine support 2.
  • the rotary shaft 3C is formed as a hollow cylindrical body that is rotatably supported in the motor case 3A via an air bearing (not shown). As for this rotating shaft 3C, the rear end side is attached to the center of the turbine 3B, and the front end side protrudes from the motor case 3A to the front side. A rotary atomizing head 4 is attached to the front end portion of the rotary shaft 3C using, for example, screwing means.
  • the rotary atomizing head 4 is provided on the front side of the rotary shaft 3C of the air motor 3.
  • the rotary atomizing head 4 is formed as a cylindrical body with a conductive metal material including, for example, an aluminum alloy, and is held at a ground potential through the air motor 3.
  • the rotary atomizing head 4 is formed as a long cylindrical body, for example, and has a mounting portion 4A whose rear side extends linearly in the axial direction. 4 A of attachment parts are attached to the front-end part of the rotating shaft 3C, for example using a screwing means.
  • the front side of the rotary atomizing head 4 is an expanded portion 4B that gradually expands forward, and the inner peripheral surface of the expanded portion 4B is a paint thinning surface 4C that thins the supplied paint. Yes. Further, the front end (front end) of the paint thin film surface 4C is a discharge edge 4D that discharges the thin paint as paint particles.
  • Rotating atomizing head 4 is rotated at high speed by air motor 3.
  • the coating material is sprayed from the discharge edge 4D by centrifugal force while being thinned on the coating film thinning surface 4C.
  • the paint particles sprayed from the discharge edge 4D are accelerated toward the object to be disposed in front by shaping air from a shaping air ejection member 9 described later from the rear side.
  • the paint particles sprayed from the discharge edge 4D are negatively charged by the external electrode member 6 described later, thereby forming an electrostatic field formed between the object to be coated and held at the ground potential. Can fly along.
  • the feed tube 5 is provided so as to be inserted into the rotary shaft 3C, and the rear end side thereof is inserted into the insertion hole 2D of the coating machine support 2.
  • the front end side of the feed tube 5 protrudes from the rotary shaft 3 ⁇ / b> C and extends into the rotary atomizing head 4.
  • a paint passage is provided in the feed tube 5, and the paint passage is connected to a paint supply source and a cleaning fluid supply source (both not shown) via a color change valve device. Thereby, at the time of painting, the paint supplied from the paint supply source through the paint passage is discharged from the feed tube 5 to the rotary atomizing head 4.
  • the cleaning fluid (thinner, air, etc.) supplied from the cleaning fluid supply source is discharged from the feed tube 5.
  • the external electrode member 6 is located on the rear side of the rotary atomizing head 4 and is provided on the outer peripheral side of the coating machine support 2.
  • the external electrode member 6 is provided on the outer peripheral side of the coating machine support 2 and is formed of an annular external electrode support cylinder 6A made of an insulating resin material, and a plurality of external electrode members 6A at regular intervals (in the circumferential direction).
  • the electrode mounting holes 6B (only two are shown) and the electrodes 6C attached to the electrode mounting holes 6B are arranged.
  • a number of holes 6A1 corresponding to the needle-like portions 6C1 of the respective electrodes 6C are provided on the front side of the external electrode supporting cylinder 6A.
  • the external electrode member 6 is configured so that the coating machine support 2 is located near the rear side of the coating machine support 2 in order to use the coating machine 1 in a narrow space like the inside of the vehicle body. Near the outer peripheral side.
  • a negative high voltage is applied to the external electrode member 6 from a high voltage generator (not shown) to each electrode 6C.
  • the external electrode member 6 generates corona discharge by each electrode 6C, and charges the paint particles sprayed from the discharge edge 4D of the rotary atomizing head 4 to the negative polarity.
  • the inner cover member 7 constitutes a cover member together with an outer cover member 8 described later.
  • the inner cover member 7 is formed as, for example, a cylindrical body that is made of an insulating resin material and has a reduced diameter in an arc shape toward the front side.
  • the inner cover member 7 is provided between the external electrode member 6 and a shaping air ejection member 9 described later so as to surround the air motor 3.
  • the inner cover member 7 has a rear side attached to the outer peripheral side of the coating machine support 2 and a front side attached to a rear portion of the outer peripheral surface 9B of the shaping air ejection member 9.
  • the outer cover member 8 constitutes a cover member together with the inner cover member 7 and, like the inner cover member 7, is formed as a cylindrical body whose diameter is reduced in an arc shape toward the front side by an insulating resin material. ing.
  • the outer cover member 8 is provided between the external electrode member 6 and the shaping air ejection member 9 so as to surround the air motor 3 from the outer side of the inner cover member 7.
  • the outer cover member 8 has a rear side attached between the inner cover member 7 and the inner peripheral side of the external electrode member 6, and a front side attached to a front side portion of the outer peripheral surface 9B of the shaping air ejection member 9.
  • the outer cover member 8 can be removed when the rotary atomizing head 4 and the shaping air ejection member 9 are assembled or disassembled.
  • the shaping air ejection member 9 has an outer periphery of the rotary atomizing head 4 in a state where a front end (a front side portion 9D described later) is located at an intermediate portion in the length direction of the rotary atomizing head 4 (the rear side of the expanded portion 4B). Arranged on the side.
  • the shaping air ejection member 9 is made of a conductive metal material including, for example, an aluminum alloy, and is held at the ground potential via the air motor 3.
  • the shaping air ejection member 9 is formed as a stepped cylindrical body surrounding the rotary atomizing head 4.
  • the inner peripheral surface 9 ⁇ / b> A of the shaping air ejection member 9 faces the outer peripheral surface of the rotary atomizing head 4 with a slight gap.
  • the outer peripheral surface 9B of the shaping air ejection member 9 has an inner cover attachment portion 9B1 on the rear side and a tapered portion 9B2 that gradually decreases in diameter toward the front side.
  • the front side part of the inner cover member 7 is attached to the inner cover attachment part 9B1 in an externally fitted state.
  • the tapered portion 9B2 is covered by the outer cover member 8 up to the front side position of the intermediate portion in the front and rear directions, and the front side is exposed to the outside.
  • the rear end portion of the shaping air ejection member 9 is a cylindrical mounting screw portion 9C, and the mounting screw portion 9C is screwed to the female screw portion 2C of the coating machine support 2. Thereby, the shaping air ejection member 9 is attached to the front part of the coating machine support 2 using the attachment screw portion 9C.
  • the front portion 9D of the shaping air ejection member 9 has a range extending in a cylindrical shape from the front portion of the taper portion 9B2, that is, a cylindrical shape indicated by a two-dot chain line in FIGS.
  • the virtual boundary surface 9F is provided.
  • the cylindrical virtual boundary surface 9F of the shaping air ejection member 9 has a similar shape shown in FIG. 8 as a comparative example. That is, the virtual boundary surface 9F of the shaping air ejection member 9 corresponds to the cylindrical surface 9F ′ on the front side of the tapered portion 9B2 of the shaping air ejection member 9 in FIG.
  • the front portion 9D of the shaping air ejection member 9 is formed as a cylindrical body having a substantially constant outer diameter so as to be connected to the virtual boundary surface 9F.
  • the front end of the front portion 9 ⁇ / b> D is a flat annular front end surface portion 9 ⁇ / b> E.
  • the front end surface portion 9E is provided with a first air ejection hole 10 and a second air ejection hole 12 that are open.
  • the front end face portion 9E is arranged around the rear position of the spread site 4B of the rotary atomizing head 4.
  • the diameter (outside diameter of the virtual interface 9F) is set to the dimension D (mm).
  • a flange member 14 described later is provided on the outer diameter side of the front side portion 9D (virtual boundary surface 9F) so as to be flush with the front end surface portion 9E.
  • a large number of first air ejection holes 10 are provided at equal intervals over the entire circumference in the circumferential direction, located closer to the outer diameter side of the front end surface portion 9E.
  • the first air ejection hole 10 is connected to a first shaping air supply source (not shown) through a first shaping air passage 11.
  • the first air ejection hole 10 ejects the first shaping air toward the vicinity of the discharge edge 4 ⁇ / b> D of the rotary atomizing head 4.
  • a large number of second air ejection holes 12 are provided on the inner side in the radial direction of the first air ejection holes 10 at equal intervals over the entire circumference in the circumferential direction on the front end surface portion 9E.
  • the second air ejection hole 12 is connected to a second shaping air supply source (not shown) through the second shaping air passage 13.
  • the second air ejection hole 12 ejects the second shaping air toward the back surface of the rotary atomizing head 4.
  • the first shaping air ejected from the first air ejection hole 10 and the second shaping air ejected from the second air ejection hole 12 are released from the discharge edge 4D of the rotary atomizing head 4.
  • the liquid yarn of the paint is sheared to promote the formation of paint particles, and the spray pattern of the paint particles sprayed from the rotary atomizing head 4 is shaped.
  • the spray pattern can be changed to a desired size and shape by appropriately adjusting the pressure of the first shaping air and the pressure of the second shaping air.
  • the first and second shaping airs are sprayed on the paint particles flying radially outward from the discharge edge 4D of the rotary atomizing head 4 by centrifugal force, so that the direction of the paint particles is gradually covered. Accelerate the paint particles while facing the paint.
  • the eaves member 14 is provided in the front part 9D of the shaping air ejection member 9.
  • the flange member 14 is formed as an annular plate-like body that is located on the outer peripheral side of the front portion 9D and extends in the radial direction.
  • the eaves member 14 extends outward in the radial direction with a virtual boundary surface 9F positioned on the outer diameter side of the front portion 9D, that is, on the front side of the tapered portion 9B2 of the outer peripheral surface 9B.
  • the eaves member 14 prevents a part of the paint particles sprayed from the rotary atomizing head 4 from flowing around to the rear side of the rotary atomizing head 4 due to the air flow generated by the shaping air.
  • the collar member 14 is formed integrally with the shaping air ejection member 9. Further, the eaves member 14 includes a front surface portion 14A that is a flat surface that is coplanar with the front end surface portion 9E of the shaping air ejection member 9, a rear surface portion 14B that is located on the opposite side of the front surface portion 14A in the front and rear directions, The front surface portion 14 ⁇ / b> A and the peripheral portion 14 ⁇ / b> C that is the outermost peripheral portion of the rear surface portion 14 ⁇ / b> B are provided. Thereby, the eaves member 14 suppresses the coating particles from getting around the rear side of the rotary atomizing head 4 on the air flow generated by the shaping air.
  • connection portion of the outer peripheral surface 9B with the tapered portion 9B2 is a smooth arcuate surface 14B1.
  • the arcuate surface 14B1 can improve the cleaning performance of the attached paint by eliminating the angular corners.
  • the diameter dimension E (mm) of the eaves member 14 is set as the following formula 1 with respect to the diameter dimension D (mm) of the front portion 9D of the shaping air ejection member 9.
  • the eaves member 14 extends outward in the radial direction, thereby suppressing the air around the front portion 9D of the shaping air ejection member 9 and the outer cover member 8 from being pulled forward by the shaping air. Can do. Moreover, since the front surface part 14A is arrange
  • the coating machine 101 has the same configuration as the coating machine 1 according to the first embodiment except that the gutter member 14 is not provided.
  • Turbine air is supplied to the turbine 3B of the air motor 3 to rotate the rotating shaft 3C.
  • the rotary atomizing head 4 rotates at high speed together with the rotary shaft 3C.
  • the paint selected by the color change valve device (not shown) is supplied from the paint passage of the feed tube 5 to the rotary atomizing head 4.
  • the supplied paint is sprayed as paint particles from the discharge edge 4D by centrifugal force while being thinned by the paint thinning surface 4C of the rotary atomizing head 4.
  • the paint particles immediately after being separated from the discharge edge 4D of the rotary atomizing head 4 are not directed to the object disposed in front, and are radially outside by the centrifugal force of the rotary atomizing head 4.
  • the shaping air ejection member 9 causes the air propelling force to spray the shaping air from the air ejection holes 10 and 12 toward the paint particles.
  • the paint particles are gradually accelerated toward the front object to be coated. Further, the shaping air can appropriately shape the spray pattern of the paint particles while atomizing the paint particles.
  • each electrode 6C of the external electrode member 6 When the paint particles are sprayed from the discharge edge 4D of the rotary atomizing head 4, a negative high voltage by a high voltage generator is applied to each electrode 6C of the external electrode member 6. Each electrode 6C forms lines of electric force with the object to be coated that is held at the ground potential, and charges the paint particles sprayed from the discharge edge 4D to a negative polarity. Accordingly, the coating particles can be efficiently supplied to the object to be coated along the lines of electric force, and the coating efficiency can be improved.
  • the air flow indicated by the arrow 16 moves the air around the outer cover member 8 and the shaping air ejection member 9 forward, so that the rotation fog is directed toward the outer cover member 8 and the shaping air ejection member 9.
  • the air around the chemical head 4 is pulled.
  • the air flow indicated by an arrow 17 collides with the outer cover member 8 and the shaping air ejection member 9 and moves toward the rear of the outer cover member 8.
  • the air flow indicated by the arrow 17 flows in an arc or vortex around the outer cover member 8. Since the air flowing around the rotary atomizing head 4 and the outer cover member 8 contains paint particles, the paint particles adhere to the front portion of the outer cover member 8 and the shaping air ejection member 9.
  • a saddle member 14 is provided in the middle of the air flow indicated by an arrow 18 at the front end of the shaping air ejection member 9.
  • the flange member 14 functions as a wall that blocks the flow of air toward the front portion 9 ⁇ / b> D of the shaping air ejection member 9 and the outer cover member 8. That is, the eaves member 14 can block the air flow toward the front portion 9D of the shaping air ejection member 9.
  • the collar member 14 can suppress the flow of air from the periphery of the shaping air ejection member 9 toward the front.
  • the eaves member 14 can suppress contamination of the rotary atomizing head 4 due to the paint particles.
  • a shaping air ejection member 9 in which 10 and 12 are provided over the entire circumference in the circumferential direction is provided.
  • the front side part 9D of the shaping air ejection member 9 is provided with an annular flange member 14 extending radially outward from the outer peripheral surface 9B of the front side part 9D.
  • the flange member 14 can block the air flow toward the front portion 9D of the shaping air ejection member 9 and the outer cover member 8, and can form a negative pressure region on the front surface portion 14A side of the flange member 14. it can. For this reason, it is possible to prevent a part of the paint particles sprayed from the rotary atomizing head 4 from going around to the rear side of the rotary atomizing head 4. As a result, the collar member 14 can suppress adhesion of the paint particles to the shaping air ejection member 9 and the outer cover member 8.
  • the coating failure due to the coating particles adhering to the shaping air ejection member 9 and the outer cover member 8 can be prevented, the number of times (frequency) of the cleaning operation of the coating machine 1 in the coating line can be reduced. . As a result, the time required for cleaning during the painting operation can be shortened, so that productivity can be improved.
  • the eaves member 14 is formed as a plate-like body having a flat front surface portion 14A. Further, the front surface portion 14 ⁇ / b> A of the flange member 14 made of a plate-like body is formed as the same surface as the front end surface portion 9 ⁇ / b> E of the shaping air ejection member 9. Therefore, the eaves member 14 made of a plate can be easily provided, and adhesion of the paint to the shaping air ejection member 9 can be prevented at a low cost. Moreover, since the eaves member 14 is flush with the front end surface portion 9E of the shaping air ejection member 9, it is possible to prevent a situation in which the paint enters the mounting gap between the shaping air ejection member 9 and the eaves member 14. Cleaning time can be shortened.
  • a cylindrical inner cover member 7 and an outer cover member 8 are provided at positions surrounding the air motor 3 and the shaping air ejection member 9 so as to cover them.
  • the air motor 3 can be covered by the cover members 7 and 8.
  • the outer cover member 8 having an outer surface formed in a smooth arc shape can reliably clean the adhered paint in a short time even if the paint adheres.
  • FIG. 4 shows a second embodiment of the present invention.
  • the feature of the second embodiment resides in that a purge air ejection portion that ejects purge air from the rear side to the front side along the outer circumferential surface of the cover member is provided on the outer circumferential side of the cover member.
  • the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is simplified.
  • the outer cover member 21 according to the second embodiment has a cylindrical shape whose diameter is reduced in an arc shape toward the front side by an insulating resin material, in substantially the same manner as the outer cover member 8 according to the first embodiment. It is formed as a body.
  • the outer cover member 21 according to the second embodiment has a long portion fitted in the external electrode member 6, and a communication passage 22 ⁇ / b> A of a purge air ejection portion 22 described later is formed in the rear portion. This is different from the outer cover member 8 according to the first embodiment.
  • the purge air ejection part 22 is provided on the outer peripheral side of the outer cover member 21.
  • the purge air ejection part 22 ejects purge air from the rear side to the front side of the outer cover member 21 along the outer peripheral surface 21 ⁇ / b> A of the outer cover member 21.
  • the purge air ejection part 22 is located on the front side of the external electrode member 6 and is provided between the outer peripheral surface 21A of the outer cover member 21 and the external electrode support cylinder 6A of the external electrode member 6.
  • the purge air ejection portion 22 includes a plurality of communication passages 22A communicating with a purge air supply passage (not shown) separate from the first shaping air passage 11, and an annular space portion communicating with each communication passage 22A.
  • the annular chamber 22B is formed, and a jet port 22C opened from the annular chamber 22B to the front surface of the external electrode support cylinder 6A of the external electrode member 6.
  • the annular chamber 22B temporarily stores the compressed air supplied from each communication passage 22A, so that uniform purge air can be ejected from the ejection port 22C over the entire circumference.
  • the jet outlet 22C is opened toward the front side as an entire circumferential groove (annular groove) with a small gap.
  • the jet outlet 22C is designed to be inclined inward in the radial direction so that the jet direction of the purge air faces the outer peripheral surface 21A of the outer cover member 21.
  • the purge air ejection part 22 ejects the purge air from the ejection port 22C toward the front side. Since this purge air is ejected toward the outer peripheral surface 21A of the outer cover member 21, due to the surface adhesion effect (Coanda effect) or the like, for example, as indicated by the two-dot chain line arrow 23, the purge air is moved forward along the outer peripheral surface 21A. It flows toward.
  • the purge air ejected from the purge air ejection section 22 forms an air curtain along the outer peripheral surface 21A of the outer cover member 21.
  • the air curtain by the purge air flows toward the outer peripheral side of the flange member 14. Therefore, the purge air can suppress the flow of air toward the front portion 9 ⁇ / b> D of the shaping air ejection member 9 and the outer cover member 21. Thereby, it can control that paint particles adhere to front side part 9D and outside cover member 21.
  • the purge air has a significantly lower flow rate than the shaping air ejected from the air ejection holes 10 and 12, and is set to a flow rate of, for example, 1/10 or less. For this reason, the purge air does not affect the shaping air.
  • the outer peripheral surface 21A of the outer cover member 21 is provided with the purge air ejection portion 22 that ejects purge air from the rear side toward the front side along the outer peripheral surface 21A of the outer cover member 21. It is set as the structure to provide. Therefore, by causing the purge air ejected from the purge air ejection portion 22 to flow along the outer peripheral surface 21A of the outer cover member 21, contamination of the outer peripheral surface 21A can be suppressed by the air curtain caused by the purge air, and productivity is increased. Can be improved.
  • FIG. 5 shows a third embodiment of the present invention.
  • the eaves member is formed of a resin material provided separately from the shaping air ejection member, and is disposed at a position spaced rearward from the front end of the shaping air ejection member.
  • the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is simplified.
  • the eaves member 31 according to the third embodiment is provided separately from the shaping air ejection member 9, and has an annular shape extending outward in the radial direction from the outer peripheral surface 9 ⁇ / b> B of the front portion 9 ⁇ / b> D of the shaping air ejection member 9. It consists of a plate. Moreover, the eaves member 31 is formed from a resin material (for example, an insulating resin material). Furthermore, the collar member 31 is arrange
  • the installation position in the axial direction (front and rear) of the eaves member 31 can be set as appropriate. That is, when the front end surface portion 9E of the shaping air ejection member 9 is set as the reference position, the distance dimension L (mm) in the front and rear directions between the front end surface portion 9E and the flange member 31 is set as the following formula 2. ing.
  • the state in which the flange member 31 is disposed on the front side of the front end surface portion 9E with the front end surface portion 9E as a reference position is defined as minus (minus), and the flange member 31 is disposed on the rear side of the front end surface portion 9E.
  • the completed state is described as + (plus).
  • the step between the front end surface portion 9E of the shaping air ejection member 9 and the eaves member 31 can be reduced by reducing the distance dimension L, that is, L ⁇ 0 mm. Thereby, the detergency of the adhering paint can be improved.
  • the flange member 31 is provided separately from the shaping air ejection member 9. Therefore, the eaves member 31 can be retrofitted with respect to the existing shaping air ejection member 9.
  • the eaves member 31 made of a resin material can reduce the weight, reduce the manufacturing cost, and the like. Furthermore, the attachment position of the collar member 31 can be freely set in the axial direction.
  • FIG. 6 shows a fourth embodiment of the present invention.
  • the collar member is formed as a cone whose inner peripheral surface is recessed into a concave cone, and the front end of the shaping air ejection member is located at the back of the inner peripheral surface of the cone It is in that.
  • the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is simplified.
  • the flange member 41 according to the fourth embodiment is located on the outer peripheral side of the front portion 9 ⁇ / b> D of the shaping air ejection member 9 in the radial direction, almost like the flange member 14 according to the first embodiment. It is formed as an annular body extending in the direction. That is, the flange member 41 uses the virtual boundary surface 9F provided on the outer diameter side of the front portion 9D of the shaping air ejection member 9 as a boundary with the shaping air ejection member 9, and is on the outer diameter side from the virtual boundary surface 9F. Is provided. However, the flange member 41 according to the fourth embodiment is different from the flange member 14 according to the first embodiment in that it is formed as a conical body that expands toward the front side.
  • the eaves member 41 is formed as a cone whose front inner peripheral surface 41A is recessed into a concave cone.
  • the flange member 41 has a rear outer peripheral surface 41B and a peripheral edge portion 41C.
  • the front end surface portion 9E of the shaping air ejection member 9 is located in the back of the inner peripheral surface 41A of the flange member 41 made of a cone.
  • the flange member 41 is formed as a conical body that expands toward the front side, so that the expansion angle (inclination angle) of the cone is appropriately set to a desired value. Can be set.
  • FIG. 7 shows a fifth embodiment of the present invention.
  • the feature of the fifth embodiment resides in that the eaves member is formed by extending the cover member to the front side portion of the shaping air ejection member and extending the distal end portion of the cover member radially outward.
  • the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is simplified.
  • the outer cover member 51 according to the fifth embodiment has a cylindrical shape whose diameter is reduced in an arc shape toward the front side by an insulating resin material in substantially the same manner as the outer cover member 8 according to the first embodiment. It is formed as a body. However, the outer cover member 51 according to the fifth embodiment is formed so as to extend forward to the front end surface portion 9E so as to surround the front portion 9D of the shaping air ejection member 9. The outer cover member 8 is different from the outer cover member 8.
  • the outer cover member 51 is provided with a flange member 52 described later at the front end portion 51A.
  • the eaves member 52 according to the fifth embodiment is provided on the front side portion 9D of the shaping air ejection member 9, that is, on the outer peripheral side of the front end portion 51A of the outer cover member 51.
  • the flange member 52 is integrally formed with an outer cover member 51 made of a resin material (for example, an insulating resin material).
  • the shape of the eaves member 52 is omitted because there is no difference with the eaves member 14 according to the first embodiment.
  • the fifth embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment described above.
  • the eaves member 52 since the eaves member 52 is provided as a part of the outer cover member 51, the eaves member 52 can be easily changed by simply replacing the outer cover member 51 with an existing cover member. Can be provided.
  • the eaves member 41 is formed as a conical body expanded toward the front side is described as an example.
  • the present invention is not limited to this, and for example, the flange member may be formed as a conical body that expands toward the rear.
  • a purge air ejection part 22 is provided between the outer peripheral surface 21A of the outer cover member 21 and the external electrode support cylinder 6A of the external electrode member 6, and the outer cover member 21 is formed from the purge air ejection part 22.
  • the purge air is jetted toward the outer peripheral surface 21A.
  • the purge air may be ejected from the hole 6A1 of the external electrode support cylinder 6A constituting the external electrode member 6. Thereby, the purge air ejected from the hole 6A1 can prevent the paint from adhering to the needle-like portion 6C1 of the electrode 6C.
  • the purge air ejected from the hole 6A1 of the external electrode support cylindrical body 6A and the purge air ejected from the purge air ejection portion 22 may be configured to communicate with each other or may be configured to share a pressurized air source. These configurations can be similarly applied to other embodiments.
  • the rotary atomizing head type coating machine 1 is comprised as an indirect charging type rotary atomizing head type electrostatic coating machine provided with the external electrode member 6 is described as an example. did.
  • the present invention is not limited to this.
  • the present invention may be applied to a directly charged rotary atomizing head type electrostatic coating machine that directly applies a high voltage to paint supplied from a feed tube to the rotary atomizing head. You can also.
  • the present invention can also be applied to a non-electrostatic coating machine that performs coating without applying a high voltage. These configurations can be similarly applied to other embodiments.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)

Abstract

L'invention concerne un appareil de revêtement du type à tête d'atomisation rotative, dans lequel un élément de soufflage d'air de façonnage (9) est prévu sur le côté circonférentiel externe d'une tête d'atomisation rotative (4) et un grand nombre de trous de soufflage d'air (10, 12), qui soufflent de l'air de façonnage vers des particules de peinture pulvérisées depuis la tête d'atomisation rotative (4), sont prévus sur l'extrémité avant de l'élément de soufflage d'air de façonnage (9) à travers toute sa circonférence dans la direction circonférentielle. De plus, un élément de rebord annulaire (14) s'étendant radialement vers l'extérieur depuis la surface circonférentielle externe (9B) d'une partie côté avant (9D) de l'élément de soufflage d'air de façonnage (9) est prévu d'un seul tenant avec l'élément de soufflage d'air de façonnage (9) sur la partie côté avant (9D).
PCT/JP2017/005520 2016-02-19 2017-02-15 Appareil de revêtement du type à tête d'atomiseur rotative WO2017141964A1 (fr)

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Applications Claiming Priority (2)

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JP2016029865 2016-02-19
JP2016-029865 2016-02-19

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WO2017141964A1 true WO2017141964A1 (fr) 2017-08-24

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
US20210162433A1 (en) * 2019-12-02 2021-06-03 Exel Industries Electrostatic rotary projector for coating product, spraying installation comprising such a projector and coating method using such a projector
FR3123812A1 (fr) * 2021-06-15 2022-12-16 Exel Industries Pulvérisateur rotatif de produit de revêtement et procédé de contrôle d’une température de surface d’un tel pulvérisateur

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CN113634385B (zh) * 2021-07-12 2022-04-01 中国人民解放军国防科技大学 一种涡喷雾化装置

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WO2013183417A1 (fr) * 2012-06-06 2013-12-12 Abb株式会社 Appareil de peinture électrostatique

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JP3870794B2 (ja) * 2002-02-04 2007-01-24 日産自動車株式会社 回転霧化塗装装置
CN103736610B (zh) * 2009-05-11 2016-03-23 Abb株式会社 静电涂装装置
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JP2008080240A (ja) * 2006-09-27 2008-04-10 Abb Kk 静電塗装装置
JP2008188505A (ja) * 2007-02-01 2008-08-21 Honda Motor Co Ltd 回転霧化塗布装置及び回転霧化塗布方法
WO2013183417A1 (fr) * 2012-06-06 2013-12-12 Abb株式会社 Appareil de peinture électrostatique

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210162433A1 (en) * 2019-12-02 2021-06-03 Exel Industries Electrostatic rotary projector for coating product, spraying installation comprising such a projector and coating method using such a projector
EP3831499A1 (fr) * 2019-12-02 2021-06-09 Exel Industries Projecteur électrostatique rotatif de produit de revêtement, installation de projection comprenant un tel projecteur et procédé de revêtement au moyen d'un tel projecteur
CN112974009A (zh) * 2019-12-02 2021-06-18 艾克赛尔工业公司 静电旋转喷涂器、相关喷涂器设备及涂布方法
FR3123812A1 (fr) * 2021-06-15 2022-12-16 Exel Industries Pulvérisateur rotatif de produit de revêtement et procédé de contrôle d’une température de surface d’un tel pulvérisateur

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