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
• • 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
  • B05B3/1057—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 with at least two outlets, other than gas and cleaning fluid outlets, for discharging, selectively or not, different or identical liquids or other fluent materials on the rotating element
• • 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
  • 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
  • B05B3/1092—Means for supplying shaping gas
• • 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 invention concerns a spray coating device with a rotary organ for spraying coating liquid, with at least one channel that passes through the rotary spray organ and empties on its front, and which serves to feed cleaning fluid on the front, due to the rotation of which front the cleaning fluid flows across the front and is thrown off in the form of a cross-sectionally essentially ring-shaped fluid shell that produces on the front of a vacuum.
• a rotary spray organ has essentially the shape of a flat disk. It is screwed onto a shaft and has a number of channels extending through it, arranged in several circles concentric with the shaft. Coating liquid, specifically enamel, can be fed to each circle of channels by way of a line.
• the spray coating device is cleaned in that cleaning fluid, instead of coating liquid, is passed through the lines and to the channels.
• Coating liquid thrown off the rotary spray organ during coating operations attracts air from the surroundings and creates thereby a vacuum on the front of the rotary spray organ. Particles of the thrown-off coating liquid are sucked back onto the front of the rotary spray organ by this vacuum. The coating liquid particles drawn back cling to the front of the rotary spray organ and must be rinsed off during the cleaning operations by the cleaning fluid.
• German Patent Specification 36 00 920 German Patent Specification 35 05 619; German Patent Specification 15 77 919; European Patent Specification 0 092 043; German Patent Specification 32 14 314; German Patent Specification 14 27 677; U.K. Patent Specification 2 163 675; German Patent Specification 6 59 062; European Patent Specification 0 032 391; French Patent Specification 2 543 853; German Patent Specification 31 05 186; German Patent Specification 34 31 758; and European Patent Specification 0 216 173.
• the invention attempts to solve the problem of cleaning the center of rotation of the front of the rotary spray element in a simple way simultaneously and automatically when the other areas of the front are cleaned with cleaning fluid.
• the spray coating device is supposed to be small and to enable the cleaning of the entire front of the rotary spray organ in a time shorter than with prior devices.
• a gas discharge setup which relative to the rotary spray organ is essentially ring-shaped and serves to discharge a cross-sectionally essentially ring-shaped gas flow and to inject this gas flow through the fluid shell of cleaning fluid into the area of the vacuum produced by the fluid shell on the front, so that part of the gas and of the cleaning fluid particles agitated by the gas will be sucked by the vacuum on the center of rotation of the front.
• gas is on the fluid shell side away from the area of the gas vacuum inventionally so injected into the fluid shell that it will agitate the cleaning fluid in the fluid shell and form a gas/cleaning fluid mixture which by the gas vacuum within the liquid shell is drawn on the center of rotation of the front of ' the rotary spray organ.
• the gas is preferably passed across the rotary spray organ and at the fluid shell formed by the cleaning fluid, in the form of a hollow gas shell surrounding the rotary spray organ, with the gas being fed at a pressure considerably higher than that of the cleaning fluid so that the gas penetrates the fluid shell of cleaning fluid and produces in it a venturi injector effect by which the cleaning fluid is agitated and fluid particles are entrained by the gas and carried into the area of vacuum up into the center on the front of the rotary spray organ.
• Cleaning fluid is thus inventionally sucked, in the cleaning of the front of the rotary spray organ, also into the center of the front, is radially thrown off the front, thereby cleaning the entire front including the center of rotation.
• Fig. 1 a broken-off longitudinal section of an inventional spray coating device with a vertically extending axis of rotation;
• FIG. 2 a front elevation of the device relative to Figure 1, viewed in the direction of arrow II;
• FIG. 3 another embodiment of an inventional spray coating device with a horizontal axis of rotation
• Fig. 4 a front elevation of a device relative to Figure 3, viewed in the direction of arrow IV.
• the spray devices illustrated in Figures 1 through 4 contain each a rotary spray organ 4 which is rotatably supported by a carrier 2, at least one line 6 for the alternative supply of coating liquid or rinsing fluid on a backside 8 of the rotary spray organ, at least two additional lines 12 and 14 for feeding rinsing fluid on the back 8, an annular air channel 16 from which, through orifices 20 arranged in ring fashion, a ring-shaped gas curtain flows forward through an outer shell surface 22 and keeps the outer shell surface 22 clean and envelopes coating fluid thrown off the front 28 on an outer edge 30 in the form of a fluid funnel, thereby limiting its radial expanse.
• the front 28 of the rotary spray organ 4 consists partly of a flat end face area 34 which is situated concentric with the center of rotation 36 and thus concentric with the axis of rotation 38 of the rotary spray organ and extends at least up to a ring-shaped outlet 40 radially outwardly. Coating liquid or cleaning fluid flows from the back 8 through the outlet 40 to the front 28.
• Another part of the front 28 is formed by the end face 42 of the head 44 of a screw 46 with which the rotary spray organ 4 is fastened on a shaft 48.
• the end face 42 is flat and lies in the same plane as the flat end face area 34.
• Cleaning fluid from the line 12 is "shot" through an annular channel 50, which concentric with the axis of rotation 38 is formed in the rotary spray organ 4, past the screw head 44 and to the front 28/ An area 54 curving forwardly in bell shape and on the end of which the edge 30 is.contained borders at a radial spacing 52 on the flat end surface area 34 on the front 28.
• FIG. 1 The embodiment according to Figures 1 and 2 is a so-called "roof machine” for coating the roof areas of objects, for instance of automobile bodies.
• the axis of rotation 38 is for the purpose arranged vertically and the front 28 directed down at the surface to be coated.
• the side directed down is marked “X” while the side directed upward is marked “Y.”
• a number of bores 68 are formed in the ring 60 on a circle 66, distributed across the entire periphery, which bores are arranged concentric and parallel with the axis of rotation 38 and connect the annular channel 62 with the surrounding atmosphere.
• the bores 68 extend thus at an angle ⁇ of 90 relative to a plane 70 which is perpendicular to the axis of rotation 38.
• the bores 68 form thereby across 360 a ring-shaped gas discharge setup through which flows from the annular channel 62 a gas flow 72 having the shape of a hollow cylinder in which the rotary spray organ 4 is contained at a radial spacing.
• the front end 70 of the ring 60 is spaced from the edge 30 of the rotary spray organ 4 a distance 73 in the range of 30 to 50 mm.
• Air is discharged through the gas discharge setup, or the bores 68, not during the discharge of coating liquid but while cleaning fluid is passed through the lines 6, 12 and 14.
• This cleaning fluid a solvent, is supplied at a pressure ranging from 1.5 to 3.5 bars and is thrown off on the front 28 from the edge 30 in the form of a fluid shell 32.
• the cleaning fluid flows at a high velocity across the front 28 because the rotary spray organ 4 rotates at a high speed, for instance of 25,000 rpm, entraining air from the area located before the front and creating in this area a vacuum.
• This mixture is attracted along arrows 80 by the vacuum in the area 76 before the front 28 and drawn onto the entire end face 34 and the end face 42 of the screw head 44, which form the front 28.
• the attracted mixture proceeds in this way up to the center of rotation 36 where it is caught by the end face 42 of the screw and driven radially outward, due to the rotation, thereby cleaning the entire front 28.
• FIG. 3 and 4 is a so-called "side machine” for coating side surfaces.
• the axis of rotation 38 is therefore horizontal in this embodiment.
• a ring 90 which functionally corresponds to the ring 60, is arranged so as to be adjustable in the direction of rotation and in axial direction, in which ring there are bores 94 provided only in a lower section 92 across an angle c of 120°, which bores are concentric and parallel with the axis of rotation 38.
• a number of bores 96 are formed across. the remaining partial circle 93, across an angle ⁇ of 240°, the axes 98.

Landscapes

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

Applications Claiming Priority (2)

Publications (2)

Family

ID=6329854

Family Applications (1)

Country Status (6)

Families Citing this family (8)

Citations (2)

Family Cites Families (16)

• 1987
  • 1987-06-16 DE DE19873720200 patent/DE3720200A1/de not_active Withdrawn
• 1988
  • 1988-05-25 JP JP63505161A patent/JPH02503647A/ja active Pending
  • 1988-05-25 EP EP19880905505 patent/EP0371977A4/de not_active Withdrawn
  • 1988-05-25 WO PCT/US1988/001746 patent/WO1988010153A1/en not_active Application Discontinuation
  • 1988-06-15 ES ES8801859A patent/ES2010758A6/es not_active Expired
• 1989
  • 1989-01-21 KR KR1019890700115A patent/KR890701221A/ko not_active Application Discontinuation

Patent Citations (2)

Non-Patent Citations (2)

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