EP3831499A1 - Rotierender elektrostatischer projektor für beschichtungsmaterial, sprühanlage, die eine solche sprühvorrichtung umfasst, und beschichtungsverfahren mithilfe dieser sprühvorrichtung - Google Patents

Rotierender elektrostatischer projektor für beschichtungsmaterial, sprühanlage, die eine solche sprühvorrichtung umfasst, und beschichtungsverfahren mithilfe dieser sprühvorrichtung Download PDF

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Publication number
EP3831499A1
EP3831499A1 EP20211138.1A EP20211138A EP3831499A1 EP 3831499 A1 EP3831499 A1 EP 3831499A1 EP 20211138 A EP20211138 A EP 20211138A EP 3831499 A1 EP3831499 A1 EP 3831499A1
Authority
EP
European Patent Office
Prior art keywords
skirt
ring
projector
annular slot
air
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.)
Granted
Application number
EP20211138.1A
Other languages
English (en)
French (fr)
Other versions
EP3831499B1 (de
Inventor
Didier Faure
Olivier Gourbat
Benoit VEDOVATI
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.)
Exel Industries SA
Original Assignee
Exel Industries SA
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Filing date
Publication date
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Publication of EP3831499A1 publication Critical patent/EP3831499A1/de
Application granted granted Critical
Publication of EP3831499B1 publication Critical patent/EP3831499B1/de
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    • 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
    • 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
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • 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
    • 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
    • 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
    • B05B12/32—Shielding elements, i.e. elements preventing overspray from reaching areas other than the object to be sprayed
    • 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
    • B05B13/06—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 specially designed for treating the inside of hollow bodies
    • 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
    • B05B3/1007—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 characterised by the rotating member
    • B05B3/1014—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 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
    • 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
    • B05B5/053—Arrangements for supplying power, e.g. charging power
    • B05B5/0533—Electrodes specially adapted therefor; Arrangements of electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • 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
    • 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
    • B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
    • B05B13/0431—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation with spray heads moved by robots or articulated arms, e.g. for applying liquid or other fluent material to three-dimensional [3D] surfaces
    • 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
    • B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
    • B05B13/0447—Installation or apparatus for applying liquid or other fluent material to conveyed separate articles
    • B05B13/0457—Installation or apparatus for applying liquid or other fluent material to conveyed separate articles specially designed for applying liquid or other fluent material to three-dimensional [3D] surfaces of the work, e.g. by using several moving spray heads
    • 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
    • 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
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/082—Plant for applying liquids or other fluent materials to objects characterised by means for supporting, holding or conveying the objects

Definitions

  • the present invention relates to a rotating electrostatic sprayer for coating material which comprises a spray bowl, a body and a turbine mounted therein and configured to drive the bowl in rotation about an axis defined by the body.
  • the invention more particularly intends to remedy by proposing a new electrostatic sprayer of coating product which can be used to coat interior surfaces and which needs less to be cleaned by interrupting the operation of a coating product. installation than those of the prior art.
  • annular slot supplied by a pressurized air flow circuit is defined radially between the ring and the skirt, with its outlet directed towards the front of the projector.
  • the exit from the annular slot makes it possible to direct an air flow towards the part of the projector located at the front of the ring and of the various electrodes.
  • This air flow preferably flows continuously when the projector is in operation and it licks the external surface of the projector, in particular the external surface of the skirt, which prevents or greatly limits the deposits of coating product on this. area.
  • the projector has less tendency to get dirty and the cleaning operations can be more spaced out in time than with known projectors.
  • the invention relates to an installation for electrostatic projection of coating product on objects to be coated, which comprises at least one projector as mentioned above.
  • the invention relates to a process for coating objects by electrostatic means, this process being carried out by means of a projector as mentioned above, while the slit is supplied by the flow circuit d. pressurized air.
  • the annular slot is supplied with pressurized air with a flow rate of between 100 and 500 l / min, preferably between 200 and 400 l / min, more preferably equal to 300 l / min.
  • Installation 2 shown very schematically on figure 1 is used for coating objects O which, in the example of the figures, are electrical cabinet boxes or air conditioning systems which have openings O1 and O2 and which each define an interior volume VO.
  • objects O are moved by a conveyor 4, in a conveying direction represented by an axis X4 on the figure 1 .
  • the conveyor 4 comprises several nacelles 42 which each make it possible to support an object O to be coated and to move it along the axis X4.
  • the installation 2 also comprises an electrostatic and rotating projector 10 which is represented, on the figure 1 on a larger scale than the other components of the installation 2.
  • This projector 10 is mounted on the wrist 62 of a multi-axis robot 6 which also belongs to the installation 2. It is supplied with coating product to be sprayed, in high voltage and pressurized air through ducts not visible on the figures 1 and 2 and which circulate through the wrist 62.
  • the projector 10 makes it possible in particular to apply a coating product to the internal surfaces of an object O supported by the conveyor 4, which delimits its internal volume VO.
  • the projector 10 is compact enough to engage in the interior volume VO through one of the openings O1 or O2.
  • the projector 10 comprises a body 102 on which is mounted a turbine 104 for driving a bowl 106 in rotation, about an axis of rotation A100 defined by the body 102.
  • the bowl 106 is secured to the rotor of the turbine 104. by any suitable means, in particular by screwing or by magnetic assembly.
  • the body 102 is mounted on a plate 108 which constitutes the distal face of an angled part 110 of the projector 10, which makes it possible to offset the axis A100 with respect to a central axis A62 of the wrist 62.
  • a cable 112 for supplying the projector 10 with high voltage for example a voltage between -40 and -100kV, in particular equal to -60kV.
  • An injector 120 is placed in the center of the turbine 104 and makes it possible to inject liquid coating product into the bowl 106.
  • the connection between the supply pipe 116 and the injector 120 is not visible on the figure 3 because it takes place in a plane different from that of this figure.
  • the body 102 is formed of an internal part 1022 and an external part 1024 which are both assembled on the plate 108, in addition to being assembled together.
  • the front of the projector 100 is defined as the side of this projector facing the objects O to be coated when the projector 10 is operating.
  • Bowl 106 is mounted to the front of projector 106.
  • the front of projector 10 faces right on both sides. figures 1 to 5 .
  • the rear of the projector 10 is defined as the side opposite the front, the rear of the projector 10 being oriented to the left on the figures 1 to 5 , moving away from the objects O relative to the bowl 106.
  • the projector 10 includes a skirt 124 for ejecting air around the bowl 106 when the projector 10 is operating to coat objects O.
  • the skirt is a sub-assembly of the projector 10 mounted around the body 102 and the turbine 104 and which defines air circulation channels up to the vicinity of the bowl 106. More precisely, the body 102 is provided with an external thread 1021 and the skirt 124 is provided with an internal thread 1241 by which the skirt 124 is screwed. around the body 102.
  • the skirt 124 comprises a one-piece internal part 1242 and an external part 1244 which is bipartite and which comprises a front external part 1244A and a rear external part 1244B, the front external part 1244A being located further to the front of the projector 10 than the part rear external 1244B, that is to say closer to the bowl 106.
  • pressurized air circulation ducts 1246 are formed in the internal part 1242 of the skirt 124.
  • Other air circulation ducts 1247 are formed in the external part 1244.
  • the ducts 1246 and 1247 open out on a front face 1248 of the skirt 124, in the form of orifices 1249 distributed around the axis A100 and the bowl 106.
  • the various conduits 1246 and 1247 are supplied with pressurized air from the hose 118, the connection between these conduits and this hose taking place on a plane different from that of the figure 3 .
  • Electrodes 140 are mounted on an annular ring 160 which is in the form of a closed ring, with a circular base in the example.
  • each electrode 140 comprises a body 142 and a needle 144, the tip of which is 146 denoted which is turned towards the front of the projector 10.
  • each electrode 140 is housed in a sleeve 170 in which is also received a resistor 180, through which the electrode 140 is supplied with high voltage from the cable 112.
  • a resistor 180 There is a first front end 184. of each resistor 180 by which this resistor bears against the body 142 of the electrode which it supplies.
  • a male plug 113 disposed at the end of the cable 112 is plugged into a female plug 190 of corresponding shape, which is connected, by a conductive bar 192, to one of sixteen blind housings 194 in each of which is arranged a female plug 196.
  • the parts 1022 and 1024 of the body 102 are made of an electrically insulating material, such as PTFE, and the internal surface of each of the blind housings 194 is coated with a conductive powder, for example a carbon-based powder.
  • a conductive powder for example a carbon-based powder.
  • the conductive layers of the various blind housings 194 are electrically connected to each other by conductive elements 198 embedded in the body 102.
  • each of the female plugs 196 is brought to high voltage, from the high voltage cable 112. .
  • the body 102 is equipped with sixteen sleeves 200 each aligned with a blind housing 194 along their longitudinal axis A200 which is parallel to the axis A100 and offset radially with respect to the latter.
  • the sleeves are each arranged in front of a blind housing 194.
  • the sleeves 200 are each located in the extension of a blind housing 194, along an axis A200 parallel to the axis A100, and a female plug 196 is aligned, along an axis A200, with each of the sleeves 200, on the rear side of this sleeve.
  • Each sleeve 170 is screwed into the ring 160 by means of a thread 172 provided near a first front end 174 of each sleeve.
  • the ring 160 is provided with sixteen internal threads 162 allowing the front ends 174 of the sleeves 170 to be screwed in.
  • each sleeve 170 is mounted and firmly held in position on the ring 160, all the sleeves 170 and the resistors 180 that they contain. 'extending from the same side of the ring 160, essentially outside the latter, towards the rear of the projector 10, in the direction of the blind housings 194.
  • An O-ring 202 is mounted around the body 142 of an electrode 140, inside the first front end 174 of the corresponding sleeve 170, while another O-ring 204 is mounted between the first front end 174 of the sleeve 170. and the ring 160.
  • the seals 202 and 204 provide a seal between the interior volume of a sleeve 170 and the exterior.
  • each point 146 is placed in a bowl 166 provided for this purpose on the front face 168 of the ring 160 facing the front of the projector 10.
  • Each point 146 protrudes from the bottom of a bowl 166, towards the front. .
  • the tips 146 do not protrude towards the front of the front face 168, which limits the risks of injury during handling of the ring 160, in particular during wiping of the surface 168.
  • the ring 160 also comprises a latching member formed by an elastically deformable tab or band 169 which extends over the entire periphery of the ring 160 and which is provided to cooperate with a complementary latching relief 1029 provided on the outside. of the body 102, with a geometry corresponding to that of the tab 169. This makes it possible to immobilize axially and to center the ring 160 radially to the axis A100 on the body 102.
  • each resistor 180 is disposed at the level of the first front end 174 of the sleeve which receives it, while the second rear end 186 of this resistor is disposed at the level of the second rear end 176 of the same sleeve.
  • An electrical connector 206 is mounted in each sleeve 170, at its rear end 176, and it accommodates a male plug 208 of the “banana plug” type with elastically deformable outer strips.
  • the second end 186 of each resistor 180 is thus equipped, through a connector 206, with a male plug 208 to which it is connected. All the plugs 208 extend axially on the same side of the ring 140, towards the rear of the projector 10, and parallel to each other.
  • each male plug 208 allows it to cooperate by wedging with a female plug 196 disposed in one of the blind housings 194, when the sleeve 170 to which it is integral is completely inserted into the corresponding sleeve 200, which is aligned with this blind housing. 194.
  • each of the electrodes 140 is supplied with high voltage through a conductive member 198, a female plug 196, a male plug 208, an electrical connector 206 and a resistor 180.
  • a flow of ions can be emitted by each of the tips 146 to charge the coating product leaving the edge 1062 of the bowl 106, when this bowl is driven in rotation by the turbine 104 and when this bowl is supplied with water. coating product through pipe 116.
  • the product leaving bowl 106 is thus electrostatically charged by a so-called “external” or “Corona” charging phenomenon.
  • the ring 160 tends to get dirty, particularly at the level of the cups 166 or of the front face 168, it is possible to remove the ring by a simple tensile force parallel to the axis A100, as represented by the arrow F1 to the figure 2 .
  • This force F1 results in an axial movement of the ring 160, of the sixteen electrodes 140, of the sixteen sleeves 170 and of the sixteen male plugs 208 which are integral with this ring, which has the effect of extracting the first plugs, formed by the male plugs 208 and which are movable with the ring 160, second plugs formed by the female plugs 196, which are fixed with the body 102.
  • the internal diameter of the ring 160 is strictly greater than the outside diameter of the bowl 106 and the outside diameter of the skirt 124 over its axial length between the bowl 106 and the ring 160 mounted on the body 102.
  • the projector 10 is operational again and can be used to coat the objects O, while the first ring, which has been removed, can be used. cleaned in masked time.
  • the interruption of the operation of the installation 2 is therefore limited to the time required for the dismantling and disconnection of the first ring 160 from the plugs 196 and the assembly of the second ring 160 and its connection to the plugs 196, these operations taking place by simple axial translation, in the direction of arrows F1 and F2.
  • the movement of separation of the ring 160 and the body 102 takes place against the snap-fastening force exerted by the elements 169 and 1029.
  • This snap-fastening force can be overcome by means of a sufficiently intense force F1.
  • the ring 160 is provided with a peripheral groove 165 in which the jaws of a tool, not shown, can be engaged, which makes it possible to tighten the ring 160 radially and then to exert the force of pull in the direction of arrow F1.
  • a tool can, for example, have three jaws, distributed radially around the axis A100 and which one comes to engage and clamp in the peripheral groove 165 by means of a ring which tightens these jaws.
  • the force for mounting and connecting the ring 160, in the direction of arrow F2, is a push force exerted on the front face 168.
  • the cooperation of the first and second plugs 208 and 196 makes it possible to center the ring 160 and the electrodes 140 which it carries relative to the body 102, to the bowl 106 and to the axis A100 simply by placing the ring in place. 160 around the body 102.
  • the electrodes 140, the sleeves 170, the plugs 196 and 208 and the sleeves 200 are identical.
  • the method of assembly and disassembly of the ring 160 equipped with electrodes 140 and resistors 180 on the body 102 which takes place according to two axial translational movements in the direction of the arrows F1 and F2, makes it possible to envisage an assembly and a automatic disassembly of the ring 160 on the body 102, by means of a robot.
  • This induces advantages in terms of saving time, repeatability and reliability of the assembly. This avoids human intervention in a projection booth, and therefore the associated constraints in terms of equipment, tools and safety conditions to authorize access.
  • a duct 220 is formed in the internal part 1022 of the body 102 and opens out in the vicinity of the rear edge 1245 of the rear external part 1244B of the skirt 124. More precisely, an annular volume V102 is formed between the parts 1022. and 1024 of the body 102 and the rear external part 1244B of the skirt 124 extends in part in this annular volume V102, with its rear edge 1245 engaged in a peripheral groove 1024A formed by the part 1024 of the body 102 and which constitutes the portion rear of the annular volume V102. An O-ring 222 delimits the annular volume V102 towards the front.
  • the volume V102 constitutes a pressurized air flow chamber, between the body 102 and the skirt 124 , this chamber being delimited towards the front by the seal 222.
  • the volume V102 is an annular volume, which surrounds certain portions of the parts 1022 and 1024 of the body 102, and several ducts of the type of the duct 220 are provided, which open into this volume V102 at several places distributed around the internal part. 1022 of the body 102, which makes it possible to distribute the air coming from the pipe 118 in the volume V102, around the axis A100.
  • the air which flows in the direction of the arrows F3 within the volume V102, arrives in a first chamber 224 defined between the body 102 and the skirt 124, which has, in radial section, a generally triangular shape and which is connected to a second chamber 226 by channels 228, the number of which is between 30 and 90, of preferably between 45 and 75, preferably equal to 60.
  • the second chamber 226 is annular and defined between the skirt 124 and the ring 160. It serves to distribute radially around the axis A100 the air coming from the different channels 228.
  • These different channels 228 have an internal diameter d228 of between 1.5 and 2.5mm, preferably equal to 2mm.
  • the channels have a non-circular section, it is the smallest dimension of their cross section which is between 1.5 and 2.5mm, preferably equal to 2mm.
  • their diameter d228 is the smallest dimension of their cross section.
  • the channels 228 are inclined relative to the axis A100, converging towards the front in the direction of the axis A100, which facilitates their production by drilling the rear external part 1244B of the skirt 124, posterior to the machining of the chambers 224 and 226 in this skirt.
  • the channels 228 are directed towards a wall 227 of the annular chamber which is inclined forward in the direction of the ring 160, that is to say divergent towards the front relative to the axis A100.
  • the channels are each parallel to a radial plane to the axis A100.
  • a gap 230 connects the chambers 224 and 226.
  • This gap 230 is defined between the outer radial surface S124 of the skirt 1244 and the inner radial surface S160 of the ring 160.
  • the skirt 124 and the ring 160 are not in contact, so that the radial gap 230 is formed, with a non-zero radial thickness e230.
  • This radial thickness e230 is smaller than the smallest dimension of a cross section of a channel 228.
  • the radial thickness e230 of the gap 230 can be chosen between 0.1 and 0.3mm, preferably. equal to 0.2mm.
  • the second chamber 226 opens downstream, along the outer radial surface S124 of the skirt 124, through a slot 232 which is annular and the thickness of which is denoted e232, measured radially to the axis A100.
  • This radial thickness is chosen between 0.25 and 2mm, preferably between 0.5 and 1.5mm, more preferably equal to 1 mm.
  • the external radial surface S124 is frustoconical and converges towards the front of the projector 10, in the direction of the axis A100.
  • ⁇ 124 the half-angle at the top of the surface S124 at the level of the slot 232.
  • the internal radial surface S160 of the skirt 160 is also frustoconical and converges towards the front in the direction of the 'axis A100.
  • ⁇ 160 the half-angle at the top of the surface S160 at the level of the slot 232.
  • the angles ⁇ 124 and ⁇ 160 have the same value.
  • the internal radial surface S160 of the ring 160 locally matches the outer shape of the skirt 124.
  • the thickness e232 is thus constant over the length of the slot 232.
  • the radial thickness e232 is chosen to be strictly less than the smallest dimension of a cross section of a duct 228, therefore its diameter d228 in the case of a duct 228 with a circular section.
  • the air flow in the second chamber 226 accelerates passing from the conduits 228 to the slot 232.
  • the channels are directed towards the surface 227, the air is distributed efficiently around the axis A100, circulating along this surface, before reaching the slot 232.
  • the air emerges from the slot 232 through an outlet 234 directed towards the front of the projector, which sends the air along the outer surface S124 of the skirt 124, as shown by the arrow F4 to the sides. figures 3 to 5 , with a sufficient speed to travel along the surface S124, up to the proximity of the front face 128 of the skirt 124.
  • the geometry of the surface S124 and that of the internal radial surface S160 of the ring 160 are preferably chosen such that the thickness e232 is constant along the slot 232.
  • the outlet 234 of the slot 232 then also has the radial thickness e232.
  • the angle of convergence towards the front of the surface S24 in the direction of the axis A100 is chosen to be less than or equal to 7 °.
  • the slot 232 makes it possible to direct, through its outlet 234, an air flow represented by the arrow F4 towards the part of the projector located at the front of the ring 160 and the various electrodes 140.
  • This air flow F4 which can be qualified as an air knife, preferably flows continuously when the projector 10 is in operation and it licks the external surface of the projector, in particular the external surface S124 of the skirt 124, which prevents or greatly limits the deposits of coating product on this surface.
  • the projector 10 has less tendency to get dirty and the cleaning operations can be more spaced out in time than with known projectors.
  • the air flow rate exiting through the slot 232, in the direction of arrow F4, is preferably less than the total skirt air flow rate discharged through the orifices 1249.
  • the air flow rate discharged through the slot 232 can be of the order of 300 l / min.
  • the air flow rate discharged through the slot 232 can be chosen between 100 and 500 l / min, preferably between 200 and 400 l / min, the value of 300 l / min having proved particularly effective.
  • the air leaving the slot 232 in the direction of the arrow F4 has a suction effect on the neighboring air, in particular on the air located in front of the front face 168 of the ring 160.
  • This effect d entrainment creates a current of air represented by the arrow F5 at the figure 3 , which facilitates the cleaning of the front face 168 and of the cups 166 during projection or avoids the deposit of overspray, in the event that coating product residues tend to settle there.
  • the feed rate of the volume V102 and of the slot 232 with pressurized air can be increased temporarily, in order to quickly clean the surface S124 from any deposit of coating product or moisture.
  • the feed rate of the volume V102 and of the slot 232 with pressurized air can be doubled in this case.
  • the air supplied to the volume V102 therefore the air discharged through the slot 232, is hotter than the ambient air.
  • the supply air of the slot 232 can be warmed up relative to the ambient air around the projector, which improves the drying effect of the surface S124 by the air flow coming out of the projector.
  • slot 232 through its outlet 234.
  • the air supplying the annular slot 232 can be electrically polarized.
  • electrodes not shown can be disposed in the conduit 118 or the conduits 220 and in the parallel conduits to charge the air with a polarity opposite to that of the voltage applied to the electrodes 140.
  • the air exiting the slot 232 has the same polarity as the particles of coating product ejected by the edge 1062 of the bowl 106, which has the effect of pushing these particles towards the front of the projector, limiting soiling of the surface S124 and of the ring 160, in particular of its front face 168.
  • Such a polarization of the air ejected through the slot 232 can be envisaged permanently or only in the event of a drift in the high voltage value delivered at the level of the electrodes 140.
  • the annular slot 232 and the air that comes out of it when the projector is in operation facilitates cleaning of the projector 10 within a flushing box.
  • the air flow represented by the arrow F4 eliminates the need for these gasket, internal air jet and / or scraper device because it permanently cleans the front part of the projector, including when it is engaged in the rinse box. This gives more freedom in the design of the external shape of the body 102 and of the skirt 124.
  • the air space which leaves the slot 232 through its outlet 234, as represented by the arrows F4, makes it possible to confine spills of cleaning and coating material inside the rinse box.
  • the passage of the projector in the rinsing box makes it possible to space the disassembly / reassembly of the electrode 160 relative to the body 102.
  • the ring 160 and, in particular, the electrodes 140 and the slot 232 are offset, along the axis A100, towards the rear, with respect to the edge 1062 of the bowl and with respect to the outlet orifices 1249 of the bowl. the skirt 124. More specifically, the tips 146 of the electrodes 140 and the outlet of the slot 232 to the outside are farther from the edge 1062 and from the orifices 1249 than the front outer part 1244A of the skirt 124. Further, along of the axis A100, the annular slot 232 is disposed in the vicinity of the spikes 146, which are also offset rearwardly with respect to the orifices1249. By “in the vicinity of” is meant that, along the axis A100, the tips 146 of the electrodes 140 are located less than 5 mm from the slot 232.
  • the invention is applicable with a liquid coating product, as mentioned above, or, alternatively, with a powder coating product.
  • the dismantling of the ring 160 can take place by means of a tool which exerts a tensile force not on the outside of the ring, at the level of the peripheral groove 165, but through the inside of the ring.
  • the skirt 124 is dismantled, keeping the bowl 106 in place on the impeller 104 if the diameter of the bowl is less than the inside diameter of the skirt 124. If the diameter of the bowl 106 is greater than or equal to the internal diameter of the skirt, as in the example of the figures, the bowl is removed from the turbine prior to the removal of the skirt relative to the body 102.
  • the skirt is removed by unscrewing the ring 160 with respect to the body 102, by disengaging the internal thread 1241 from the thread 1021. It is then possible to screw onto the thread 1021 the body of a tool, not shown, which is provided with elastic tabs which extend towards the rear of the projector 10, beyond a surface S161 of the ring which is radial to the axis A100 and turned towards the rear of the projector. These tabs deform elastically to pass radially through the center of the ring 160, between this ring and the body 102, inside the volume V102, when the tool is mounted on the body 102.
  • Free ends of the elastic tabs have harpoon points which, when the legs return to their unconstrained configuration, engage behind the surface S161.
  • the harpoon points are distributed around the body 102, therefore able to exert on the surface S161 an axial force in the direction of the arrow F1, this force being distributed around the axis A100 due to the multiplicity of the lugs in question.
  • This force is exerted when, after having engaged the harpoon tips of the lugs of the tool behind the surface S161, the tool is unscrewed relative to the body 102.
  • This force enables the ring 160 to be removed relative to the body 102, by means of the removal of the skirt 124 and, possibly of the bowl 106. This makes it possible to easily remove the ring thanks to the guidance of the tool on the thread which guarantees a tensile force, represented by the arrow F1, which is along the axis A100 .
  • the effort is multiplied by the screw thread.
  • the number of electrodes 140 is different from sixteen. Preferably, this number is chosen between 13 and 20, in particular between 14 and 18. The fact that the number of electrodes is strictly greater than 12 induces that the angular difference around the axis A100 between two adjacent electrodes is strictly less at 30 °. Thus, the portion of the front face 168 of the ring 160 exposed to the return of paint between two points 146 is relatively small, which limits the area of the surfaces of the ring 160 to be cleaned. the number of sleeves 170, resistors 180 and first pins 208 is equal to the number of electrodes 140.
  • the first plugs 208 secured to the ring 160 are female plugs, while the second plugs 196 secured to the body 102 are male plugs.
  • the structure and the geometry of the skirt 124 may be different from that shown in the figures.
  • the number of constituent parts of the skirt 124 may be different from three.
  • the channels 228 may have an ortho-radial component, to the point that the air leaving these channels has an ortho-radial component which is reflected in a vortex component of the air leaving the slot 232.
  • the section of the channels 228 may be other than circular.
  • channels can be made, in whole or in part, in the body 102, instead of in the skirt 124.
  • the latching members 169 and 1029 can be replaced by a seal arranged between the body 102 and the ring 160, this seal making it possible to center and clamp the ring on the body.
  • This seal is advantageously an O-ring.
  • the circuit for supplying the slot 232 with pressurized air extends both in the body 102, in the form of the ducts 220, in the skirt 124, in the form of the ducts 228, between the body 102 and the skirt, in the form of the volume V102 and between the skirt 124 and the ring 160, in the form of the gap 230.
  • this circuit extends only in one or the other of these parts or only between two of them.
  • the objects O on which the coating product is applied in the installation of the invention can be objects other than boxes, in particular motor vehicle bodies.
  • the projector 10 is particularly suitable for the application of coating product inside such bodies.
  • the multi-axis robot 6 can be replaced by another type of robot, in particular a reciprocator.
  • the invention makes it possible to envisage, in the long term, a removal of the complete outer casing of the projector and the resumption of a clean casing without stopping production, at a frequency depending on the conditions and types of application.
  • the bowl, the skirt, and the electrode are deposited when they are dirty.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Spray Control Apparatus (AREA)
EP20211138.1A 2019-12-02 2020-12-02 Rotierender elektrostatischer projektor für beschichtungsmaterial, sprühanlage, die eine solche sprühvorrichtung umfasst, und beschichtungsverfahren mithilfe dieser sprühvorrichtung Active EP3831499B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1913628A FR3103717B1 (fr) 2019-12-02 2019-12-02 Projecteur électrostatique rotatif de produit de revêtement, installation de projection comprenant un tel projecteur et procédé de revêtement au moyen d’un tel projecteur

Publications (2)

Publication Number Publication Date
EP3831499A1 true EP3831499A1 (de) 2021-06-09
EP3831499B1 EP3831499B1 (de) 2023-11-15

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US (1) US20210162433A1 (de)
EP (1) EP3831499B1 (de)
JP (1) JP2021087946A (de)
KR (1) KR20210068999A (de)
CN (1) CN112974009A (de)
ES (1) ES2969388T3 (de)
FR (1) FR3103717B1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3103718B1 (fr) * 2019-12-02 2021-12-17 Exel Ind Projecteur électrostatique rotatif de produit de revêtement et installation de projection comprenant un tel projecteur
WO2024025523A1 (en) * 2022-07-27 2024-02-01 Carlisle Fluid Technologies, LLC Electrostatic sprayer
DE102023135505A1 (de) * 2023-12-18 2025-06-18 Sata Gmbh & Co. Kg Lackierpistole
CN119634080B (zh) * 2024-09-14 2025-09-26 宁夏长鑫防腐工程有限公司 一种管道内壁防腐粉末喷涂系统

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JPH06134353A (ja) 1992-10-23 1994-05-17 Ransburg Automot Kk 静電塗装装置
FR2763263A1 (fr) * 1997-05-14 1998-11-20 Nihon Parkerizing Pistolet de pulverisation de poudre par voie electrostatique
EP1418009A2 (de) * 2002-11-06 2004-05-12 E.I.Du pont de nemours and company Rotierender Elektrodenring und seine Verwendung bei der hochtourigen Rotationzerstäubung von Beschichtungsmitteln
US20040255849A1 (en) 2002-01-24 2004-12-23 Stefano Giuliano Integrated charge ring
WO2017141964A1 (ja) * 2016-02-19 2017-08-24 Abb株式会社 回転霧化頭型塗装機
US20180141062A1 (en) 2009-03-19 2018-05-24 Dürr Systems GmbH Electrode assembly for an electrostatic atomizer
US20190283053A1 (en) * 2017-08-18 2019-09-19 Abb K.K. Electrostatic coating machine

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EP1433536A4 (de) * 2001-08-09 2008-11-19 Abb Kk Beschichtungsvorrichtung mit patrone
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JP2006181446A (ja) * 2004-12-27 2006-07-13 Mazda Motor Corp 塗装方法
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JPH0295556U (de) * 1989-01-13 1990-07-30 Gema Ransburg Ag
JPH06134353A (ja) 1992-10-23 1994-05-17 Ransburg Automot Kk 静電塗装装置
FR2763263A1 (fr) * 1997-05-14 1998-11-20 Nihon Parkerizing Pistolet de pulverisation de poudre par voie electrostatique
US20040255849A1 (en) 2002-01-24 2004-12-23 Stefano Giuliano Integrated charge ring
EP1418009A2 (de) * 2002-11-06 2004-05-12 E.I.Du pont de nemours and company Rotierender Elektrodenring und seine Verwendung bei der hochtourigen Rotationzerstäubung von Beschichtungsmitteln
US20180141062A1 (en) 2009-03-19 2018-05-24 Dürr Systems GmbH Electrode assembly for an electrostatic atomizer
WO2017141964A1 (ja) * 2016-02-19 2017-08-24 Abb株式会社 回転霧化頭型塗装機
US20190283053A1 (en) * 2017-08-18 2019-09-19 Abb K.K. Electrostatic coating machine

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Publication number Publication date
KR20210068999A (ko) 2021-06-10
JP2021087946A (ja) 2021-06-10
CN112974009A (zh) 2021-06-18
FR3103717A1 (fr) 2021-06-04
US20210162433A1 (en) 2021-06-03
ES2969388T3 (es) 2024-05-17
FR3103717B1 (fr) 2022-07-01
EP3831499B1 (de) 2023-11-15

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