EP3551336B1 - Tête de pulvérisation électrostatique - Google Patents

Tête de pulvérisation électrostatique Download PDF

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Publication number
EP3551336B1
EP3551336B1 EP17825362.1A EP17825362A EP3551336B1 EP 3551336 B1 EP3551336 B1 EP 3551336B1 EP 17825362 A EP17825362 A EP 17825362A EP 3551336 B1 EP3551336 B1 EP 3551336B1
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EP
European Patent Office
Prior art keywords
powder
spraying head
electrode
transport direction
powder spraying
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.)
Active
Application number
EP17825362.1A
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German (de)
English (en)
Other versions
EP3551336A1 (fr
Inventor
André SAIU
Pascal GAUCH
Peter Taiana
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.)
Soudronic AG
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Soudronic AG
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Publication date
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Publication of EP3551336A1 publication Critical patent/EP3551336A1/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
    • B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying
    • B05B5/032—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying for spraying particulate materials
    • 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
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/26—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets
    • B05B1/262—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets with fixed deflectors
    • B05B1/267—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets with fixed deflectors the liquid or other fluent material being deflected in determined directions
    • 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
    • B05B13/0618—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 only a part of the inside of the hollow bodies being treated
    • 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
    • B05B5/081—Plant for applying liquids or other fluent materials to objects specially adapted for treating particulate materials
    • 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
    • B05B5/12—Plant for applying liquids or other fluent materials to objects specially adapted for coating the interior of hollow bodies
    • 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
    • B05D1/06—Applying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • B21D51/2676—Cans or tins having longitudinal or helical seams

Definitions

  • the invention relates to a powder spray head for spraying a coating powder and a powder coating system for coating a can body with powder according to the preambles of the independent claims. See for example WO2014 / 102258 .
  • Powder coating systems with powder spray heads for coating can bodies are known.
  • Such powder spray heads are essentially rod-shaped and have an external diameter such that a previously welded can body can enclose them and is thereby transported in a transport direction along the powder spray head.
  • at least part of the inner surface of the can body is coated with powder.
  • the weld seam of the can body is coated in this way in order to protect it against corrosion.
  • Coating with powder takes place on the basis of electrostatic charging of the powder particles.
  • a charging electrode is used which has a negative high voltage in relation to the frame which is at zero potential. Due to the electrostatic charging of the powder particles, they are deflected in the direction of the can body and adhere to it. In order to additionally support this deflection in the direction of the can body, another so-called guide electrode is used, which is also subjected to a negative voltage. As a result, the powder particles already negatively charged become repelled by the negatively charged lead electrode, which further supports the deflection of the powder in the direction of the can body.
  • a known powder coating system from the company Soudronic from Bergdietikon, Switzerland includes, among other things, a powder spray head in which the charging electrode and the guide electrode are designed as an electrode block.
  • a powder spray head for spraying a powder suitable for coating a can body
  • which powder spray head is designed such that, for coating at least part of an inner surface of the can body, the can body to be coated surrounds the powder spray head and can be moved along the powder spray head in a transport direction .
  • the interior of the powder spray head comprises a working space which has a working opening through which the powder can reach the inner surface of the can body.
  • it comprises a powder tube for providing the powder, the powder tube opening with a powder outlet in the working space of the powder spray head.
  • the powder tube is designed in such a way that it emits the powder essentially in the transport direction into the work space.
  • the lead electrode and the charging electrode have the same polarity.
  • the charging electrode is arranged in the area of the powder outlet and runs in a pointed shape on the powder side (in the direction of the powder flowing through the powder outlet).
  • the arrangement at the powder outlet, where the powder enters the working area ensures that the effect of the electric field on the powder flowing into the working area is increased.
  • the pointed configuration of the charging electrode causes a "concentration" of the electric field at the location where the powder flows through the powder outlet.
  • the guide electrode is plate-shaped and a flat side of the guide electrode is directed towards the working space.
  • This configuration and orientation of the guide electrode allows better detection of the powder located in the work space by the associated electrical field of the guide electrode. Due to the plate-shaped design of the electrode, a more homogeneous electric field with essentially parallel field lines is created in the interior of the working space, similar to a plate capacitor, which causes the powder to be deflected as uniformly as possible away from the guide electrode towards the can body.
  • the design of the charging electrode and the guide electrode consequently result in an improved deflection of the powder in the desired direction in the interaction, but also in isolation. This allows the powder to be fed to the can body more efficiently.
  • the stronger one Electrostatic charging of the powder which is related to the special arrangement and shape of the charging electrode, is not only relevant for the deflection of the powder, but also has the effect that the powder adheres better to the can body, in other words the separation efficiency is higher.
  • a higher quality can body is produced which is even more resistant to external influences, for example corrosion, caused by the later contents of the can.
  • the powder is charged evenly regardless of the particle size.
  • the guide electrode is preferably at such a first distance from the charging electrode in the transport direction that the electrical field of the guide electrode acts on the powder electrostatically charged by means of the charging electrode immediately after the powder has entered the work space.
  • This arrangement of the guide electrode has the advantage that no or only a minimal proportion of the powder particles can flow in a direction other than the can body.
  • the powder coating system according to the invention for coating the can body with powder comprises a powder spray head according to the invention. It also includes a powder delivery device for supplying the powder spray head with powder.
  • the powder feeder can be connected to the powder tube to provide the powder.
  • the powder coating system includes a powder recovery unit for suctioning off excess powder that accumulates during the coating process.
  • the powder recovery unit is arranged downstream of one or more suction nozzles of the powder spray head in the transport direction.
  • the powder coating system has the further advantage that the powder recovery unit can "collect” excess powder, which saves powder.
  • the powder coating system according to the invention is advantageously used for coating a weld seam of the can body.
  • the powder spray head in the work space has at least one wing for guiding the electrostatically charged powder through the work opening to the part of the inner surface of the can body to be coated. In this way, the powder can be guided even better in the direction of the working opening.
  • a plurality of wings are preferably provided, which are arranged one behind the other in the working space in the transport direction in order to capture all powder particles as possible. It is further preferred that the wing or wings are bent in the direction of the working opening. If several wings are present, they each have an ever larger effective area for discharging the electrostatically charged powder. This is a further measure to capture all powder particles as possible, because the powder jet is more concentrated when it enters the work area and expands as it continues. Consequently, the wings, which are getting wider in the transport direction, take this scatter into account.
  • plate-shaped means a flat piece of a hard material, in this case metal, equally thick everywhere, bounded on two opposite sides by a flat surface that is very extensive in relation to the thickness.
  • transport direction relates to a transport direction of the can bodies and is marked with the arrow z, which at the same time also designates the longitudinal axis of the powder spray head.
  • a "working space” refers to a recess in the powder spray head in which the powder is deflected towards the can body.
  • electrically neutral in this context relates to a material that is neither electrically negatively nor electrically positively charged or chargeable.
  • axial and radial refer to a cylindrical coordinate system with the axis z.
  • front relates to the direction of the arrow z and “rear” to the opposite direction.
  • bottom and “top” refer to the direction of gravity.
  • Fig. 1 shows a powder coating system 1 according to the invention with a powder spray head 2 according to the invention in a perspective view.
  • the powder coating system 1 also comprises a powder feed device 15 for supplying the powder spray head 2 with powder, and a powder recovery unit 16 that sucks excess powder from the powder spray head.
  • the arrow 4 shows a working opening of the powder spray head 2 through which powder can pass from a working space 11 to a can body 12.
  • blades 3 are arranged in the working space.
  • Three suction nozzles 5 are arranged downstream of the working space 4.
  • the powder coating system 1 off Fig. 1 also includes a controller (not shown) with which, inter alia, the variables described above are set or monitored. The control is therefore connected to the powder spray head 2, the powder feed device 15 and the powder recovery unit 16.
  • FIG. 11 shows a detailed view of part A of the powder spray head 2 from FIG Fig. 1 in sectional view and Fig. 3 a side sectional view of the detail Fig. 2 .
  • a piece of a powder tube 9 is shown, which ends with a powder outlet 9a.
  • the powder outlet 9a which, like the powder tube 9, is made of an electrically neutral material, represents the opening of the tube 9 in a working space 11.
  • the powder outlet 9a preferably extends in the transport direction z in a conically widening manner. This results in a better distribution of the powder in the work area.
  • the charging electrode 6 is arranged in the area of the powder outlet 9a and runs in a pointed shape on the powder side with a point 6a.
  • the charging electrode 6 is arranged below the powder outlet 9a. However, it could also be arranged further forward in the z-direction in the direction of the working space 11 or further back, which is illustrated by the term “in the area of the powder outlet”. It is preferably rod-shaped and its longitudinal axis is perpendicular to the transport direction z.
  • the charging electrode preferably extends with its tip in an opening in a wall of the powder outlet 9a essentially as far as an inner surface of the powder outlet 9a. This ensures that the charging electrode is arranged as close as possible to the powder.
  • the position of the charging electrode 6 and in particular the pointed shape allow an increased electrostatic charging of the powder when it enters the working space 11.
  • the pointed configuration of the charging electrode 6 at its upper extremity means that the associated electric field is concentrated in a small area within the powder outlet 9a.
  • the powder flowing past can be electrostatically charged more effectively than with previous solutions due to the higher electric field strength in the short time in which it flows past the charging electrode.
  • the powder spray head 2 further comprises a guide electrode 7, which is plate-shaped.
  • a flat side 7a of the lead electrode is directed towards the working space. Due to the flat shape of the guide electrode 7, it is achieved that a second electrical field is generated which is many times more extensive than the electrical field of the charging electrode 6.
  • the alignment of the guide electrode 7 (surface 7a) has the effect that the electric field lines run in such a way that the already electrostatically negatively charged powder in the working space 11 is repelled by the guide electrode 7, which is also negatively charged.
  • the guide electrode 7 can, however, also be formed from several pieces, in particular from several strips. Also a slightly convex or concave shape is conceivable as long as the side 7a of the guide electrode 7 facing the working space has a large extent.
  • a powder particle during flight through the working space 11 has, on the one hand, a speed component essentially in the (axial) transport direction z, which is predetermined by the powder conveyor device 15. For the sake of simplicity, a deviation due to radial scattering of the powder is neglected here.
  • the powder particle has a velocity component in the radial direction (that is, perpendicular to the direction z), which is caused by the electric field of the guide electrode 7.
  • the resulting directional vector of the powder particle therefore depends on the flow velocity into the working space 11, the electrostatic charge through the charging electrode 6 and the strength of the electric field of the guide electrode 7. Another factor is the particle size of the powder particle.
  • the guide electrode 7 has such a first axial distance D1 ( Fig. 3 ) from the charging electrode 6, that the electric field of the guide electrode 7 acts on the powder electrostatically charged by means of the charging electrode 6 immediately after the powder has entered the working space 11. In this way it is avoided that powder particles get a downward velocity component due to their weight force and can possibly fall onto the floor of the working space 11, which is undesirable.
  • the axial distance D1 depends on the above-mentioned factors (flow velocity into the working space 11, electrostatic charge and strength of the electric field of the lead electrode 7). It is conceivable (not shown) that the guide electrode 7 is designed to be displaceable in the z direction in order to have a further degree of freedom in the event of the variation of one of the above parameters.
  • the guide electrode 7 is arranged outside the working space 11 and is preferably separated therefrom at least by means of an insulator 8. This prevents the lead electrode 7 from being coated with a powder layer over time due to the “dirty” working environment. This can e.g. occur due to turbulence or in particular when the electrical field of the guide electrode 7 is switched off, since the powder particles still flying in the work space at this point in time no longer experience any force that would compensate for their own weight and thus fall down. A layer which is formed in this way would change the electrical properties of the guide electrode 7 by forming a dielectric powder layer, which is not desirable.
  • the guide electrode 7 is preferably arranged at a greater distance from the longitudinal axis z of the powder spray head 2 than the tip 6a of the charging electrode 6. This measure serves to avoid impairing the electric field (corona effect) of the charging electrode, since otherwise the powder particles will not be charged.
  • the tip of the charging electrode must be as free as possible from other electrical fields.
  • the guide electrode 7 extends preferably over the end of the working space 11 in the transport direction, for. This will ensure that the entire Powder along the entire longitudinal extent of the work space 11 (and in particular the work opening 4) is detected by the electric field of the guide electrode 7. This is explained in more detail below in connection with the wings 3 of the powder spray head 2.
  • three wings 3 are provided for guiding the electrostatically charged powder through the work opening 4 to the part of the inner surface of the can body 12 to be coated.
  • the wings 3 are made of an electrically neutral material and are arranged one behind the other in the working space 11 in the transport direction z.
  • the powder is deflected upwards by the wings 3 (arrows 10a-d). So your job is to help deflect the powder.
  • the number of blades 3 takes into account the fact that not all powder particles fly in the z-direction at the same speed and consequently their deflection also takes place differently.
  • the different speed of the powder particles is related to the fact that powder bodies collide in the powder flow, which changes their speed.
  • the powder flow is scattered when exiting the powder outlet, whereby the powder particles get different axial components of the speed.
  • the varying mass of the powder particles also plays a role. For these reasons, some powder particles cover a longer distance in the working area than other powder particles. This is the reason why the guide electrode 7 preferably extends to the end of the work space 11.
  • the wings 3 are bent in the direction of the working opening 4 in order to enable the powder to flow past them as laminar as possible.
  • a laminar flow is fundamentally desirable in order to ensure the most even possible powder application on the inner surface of the can body 12. This avoids the time covered for Stretch of the powder particles is not lengthened by any turbulence, while no such delay occurs for other powder particles.
  • the shape of the work space 11 per se can also be designed differently from this point of view than in the exemplary illustrations. In this context is off Fig. 2 and 3 It can also be seen that the front wall of the working space 11 (at arrow 10d), viewed in the transport direction z, has the same or a similar shape as the wings 3.
  • these wings preferably each have an ever larger effective area in the transport direction z for the discharge of the electrostatically charged powder. This is related to the fact that, due to the physically induced scattering of the powder flow, this powder flow on the foremost wing 3 (at arrow 10c) is wider than at the rearmost wing 3 (at arrow 10a). This area variation therefore also causes an effective deflection further forward (in the z-direction).
  • the blades 3 preferably have a second axial distance D2 from the charging electrode 6 in the transport direction z, which is greater than the first distance D1.
  • the second axial distance D2 is understood as the distance from a starting point of a first wing 3, which is closest to the charging electrode 6, to a z-position of the charging electrode 6. This measure is used because, due to the design, the powder arrives in the working space 11 in "bursts". This means that the powder flow does not have a constant density over time, but that the density is approximately sinusoidal. Such a course would have the effect that the coating would also be wavy, i.e. with thicker and thinner sections, which is undesirable. In the “extensive” area up to the wings, the working space 11 brings about a uniformization of the density of the powder flow, so that it arrives at the can body 12 with as constant a density as possible.
  • Fig. 4 shows a cross-sectional view of the powder spray head 2, seen in direction B.
  • FIG Fig. 3 thus opposite to the transport direction z of the can body 12.
  • two sealing lips 14 are shown, which were not shown in the previous figures for reasons of clarity.
  • These sealing lips 14 are attached to a contour of the working opening 4. This can be a single sealing lip or several sealing lips.
  • a free end of the sealing lip 14 rests against the inner wall of the can body 12, so that only the part of the inner wall of the can body 12 to be coated can come into contact with the powder.
  • the coating is to be applied to the weld seam 12a as protection against corrosion, as mentioned at the beginning.
  • the working opening 4 is configured in a correspondingly slot-shaped manner in order to expose only the area around the weld seam 12a.
  • the sealing lips 14 rest on the inner wall of the can body 12, to the side of the weld seam, so that no coating powder can get to other areas of the inner wall and thus only the desired area is coated.
  • the working opening 4 and / or the sealing lips 14 can have a different shape, depending on what is to be coated.
  • the shape and extent of the guide electrode can vary according to the shape of the working opening 4.
  • the powder spray head 2 comprises a high-voltage generator (not shown) which is designed such that it generates a controllable negative voltage between 8 and 40 kV between the charging electrode 6 and the can body 12, which is grounded.
  • the generator can also be designed in such a way that it also generates a controllable negative voltage between 8 and 40 kV between the guide electrode 7 and the can body 12.
  • two different generators can be used.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (16)

  1. Tête de pulvérisation de poudre (2) pour pulvériser une poudre qui est appropriée pour revêtir un corps de boîte (12), la tête de pulvérisation de poudre (2) étant adaptée de telle manière que le corps de boîte (12) à revêtir entoure la tête de pulvérisation de poudre (2) et est mobile le long de la tête de pulvérisation de poudre (2) dans une direction de transport (z), pour revêtir au moins une partie (12a) d'une surface intérieure du corps de boîte (12), comprenant
    une chambre de travail (11) à l'intérieur de la tête de pulvérisation de poudre (2), qui comporte une ouverture de travail (4) par laquelle la poudre peut atteindre la surface intérieure du corps de la boîte (12),
    un tube à poudre (9) pour fournir la poudre, dans lequel le tube à poudre (9) avec une sortie de poudre (9a) s'ouvre dans la chambre de travail (11) de la tête de pulvérisation de poudre (2) et est adapté pour délivrer la poudre sensiblement dans la direction de transport (z) dans la chambre de travail (4),
    une électrode de charge (6) pour charger la poudre avec une charge électrostatique,
    une électrode de guidage (7), qui est disposée dans la direction de transport (z) en aval de l'électrode de charge (6) et sous la chambre de travail (11), pour dévier la poudre présente à l'intérieur de la chambre de travail (11), qui est déjà chargée électrostatiquement, sensiblement en direction de l'ouverture de travail (4), l'électrode de guidage (7) et l'électrode de charge (6) ayant la même polarité,
    l'électrode de charge (6) étant disposée dans la zone de la sortie de poudre (9a) et étant formée avec une pointe (6a) dans la direction de l'écoulement de la poudre dans la chambre de travail (11) et/ou
    l'électrode de guidage (7) étant en forme de plaque et un côté plat (7a) de l'électrode de guidage (7) étant orienté vers la chambre de travail (11).
  2. Tête de pulvérisation de poudre selon la revendication 1, dans laquelle l'électrode de charge (6) est en forme de tige et son axe longitudinal est perpendiculaire à la direction de transport (z).
  3. Tête de pulvérisation de poudre selon la revendication 1 ou 2, dans laquelle l'électrode de charge (6) s'étend avec sa pointe (6a) à travers une ouverture (9b) dans une paroi de la sortie de poudre (9a) sensiblement jusqu'à une surface intérieure de la sortie de poudre (9a).
  4. Tête de pulvérisation de poudre selon l'une des revendications précédentes, dans laquelle l'électrode de guidage (7) s'étend au moins jusqu'à une extrémité de la chambre de travail (11) dans la direction de transport (z).
  5. Tête de pulvérisation de poudre selon l'une des revendications précédentes, dans laquelle l'électrode de guidage (7) est formée par plusieurs parties, en particulier par plusieurs bandes.
  6. Tête de pulvérisation de poudre selon l'une des revendications précédentes, dans laquelle l'électrode de guidage (7) est disposée à l'extérieur de la chambre de travail (11) et est en particulier séparée de celle-ci par au moins un isolateur (8).
  7. Tête de pulvérisation de poudre selon l'une des revendications précédentes, dans laquelle l'électrode de guidage (7) est disposée à une plus grande distance de l'axe longitudinal (z) de la tête de pulvérisation de poudre (2) que la pointe (6a) de l'électrode de charge (6).
  8. Tête de pulvérisation de poudre selon l'une des revendications précédentes, dans laquelle l'électrode de guidage (7) présente une première distance axiale (D1) telle par rapport à l'électrode de charge (6) dans la direction de transport (z), que le champ électrique de l'électrode de guidage (7) agit sur la poudre, qui est chargée électrostatiquement par l'électrode de charge (6) immédiatement après l'entrée de la poudre dans la chambre de travail (11).
  9. Tête de pulvérisation de poudre selon l'une des revendications précédentes, dans laquelle au moins une lame (3) pour guider la poudre chargée électrostatiquement à travers l'ouverture de travail (4) vers la partie (12a) à revêtir de la surface intérieure du corps de boite (12) est prévue à l'intérieur de la chambre de travail (11), en particulier dans laquelle plusieurs lames (3) sont prévues, qui sont disposées à l'intérieur de la chambre de travail (11) l'une après l'autre dans la direction de transport (z), en particulier dans laquelle la ou les lames (3) sont courbées en direction de l'ouverture de travail (4), en particulier dans laquelle, en cas de présence de plusieurs lames (3), elles présentent une surface d'action croissante dans la direction de transport (z) pour dévier la poudre chargée électrostatiquement.
  10. Tête de pulvérisation de poudre selon les revendications 8 et 9, dans laquelle la lame (3) ou les lames (3) présentent une deuxième distance axiale (D2) par rapport à l'électrode de charge (6) dans la direction de transport (z), qui est supérieure à la première distance (D1).
  11. Tête de pulvérisation de poudre selon l'une des revendications précédentes, dans laquelle la sortie de poudre (9a) s'étend dans la direction de transport (z) en s'élargissant de manière conique.
  12. Tête de pulvérisation de poudre selon l'une des revendications précédentes, comprenant en outre un générateur de haute tension qui est adapté pour générer une tension négative, qui peut être régulée dans une plage de 8 à 40 kV, entre l'électrode de charge et le corps de boite mis à la terre et/ou qui est adapté pour générer une tension négative, qui peut être régulée dans une plage de 8 à 40 kV, entre l'électrode de guidage et le corps de boite mis à la terre.
  13. Tête de pulvérisation de poudre selon l'une des revendications précédentes, dans laquelle au moins une lèvre d'étanchéité (14) est fixée sur un contour de l'ouverture de travail (4), dans laquelle une extrémité libre de la lèvre d'étanchéité (14) s'ajuste sur la surface intérieure du corps de la boîte (12) lorsqu'un corps de boîte (12) est présent, de sorte que seule la partie (12a) à revêtir de la paroi intérieure peut entrer en contact avec la poudre.
  14. Tête de pulvérisation de poudre selon l'une des revendications précédentes, comprenant en outre au moins une buse d'aspiration (5) pour la poudre excédentaire, dans laquelle plusieurs, en particulier trois, buses d'aspiration (5) sont disposées l'une derrière l'autre dans la direction de transport (z).
  15. Installation de revêtement par poudre (1) pour le revêtement d'un corps de boîte (12) avec de la poudre, avec une tête de pulvérisation de poudre (2) selon l'une des revendications précédentes, comprenant en outre
    un dispositif de transport de poudre (15) pour alimenter la tête de pulvérisation de poudre (2) en poudre, dans lequel le dispositif de transport de poudre (15) peut être connecté au tube à poudre (9) pour fournir la poudre, et
    une unité de recyclage de poudre (16) pour aspirer l'excédent de poudre généré lors du revêtement, dans laquelle l'unité de recyclage de poudre (16) est disposée dans la direction de transport (z) en aval d'une ou plusieurs buses d'aspiration (5) de la tête de pulvérisation de poudre (2).
  16. Utilisation de l'installation de revêtement par poudre (1) selon la revendication 15 pour le revêtement d'un cordon de soudure (12a) du corps de boîte (12).
EP17825362.1A 2017-03-30 2017-12-14 Tête de pulvérisation électrostatique Active EP3551336B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH00430/17A CH713662A2 (de) 2017-03-30 2017-03-30 Pulversprühkopf und Pulverbeschichtungsanlage mit einem solchen.
PCT/CH2017/000103 WO2018176164A1 (fr) 2017-03-30 2017-12-14 Tête de pulvérisation de poudre électrostatique

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EP3551336A1 EP3551336A1 (fr) 2019-10-16
EP3551336B1 true EP3551336B1 (fr) 2020-10-21

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EP (1) EP3551336B1 (fr)
CN (1) CN110325285B (fr)
CH (1) CH713662A2 (fr)
ES (1) ES2828068T3 (fr)
PT (1) PT3551336T (fr)
TW (1) TWI749148B (fr)
WO (1) WO2018176164A1 (fr)

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CN111054917A (zh) * 2019-12-16 2020-04-24 汕头大学 一种多材料固态增材制造系统和方法
CN113304903B (zh) * 2021-07-29 2021-09-21 佛山市粤纯钢机电设备工程有限公司 一种静电粉末多功能喷射装置

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US20060013914A1 (en) * 2001-12-19 2006-01-19 Kikusui Seisakusho Ltd. Rotary powder compression molding machine
WO2005002738A1 (fr) * 2003-07-07 2005-01-13 Elpatronic Ag Procede de revetement d'objets, systeme d'electrode et dispositif de revetement
FR2941877B1 (fr) * 2009-02-09 2011-04-08 Sames Technologies Projecteur electrostatique comportant un dispositif de detection de vitesse de rotation
CN202316168U (zh) * 2011-11-17 2012-07-11 中冶京诚工程技术有限公司 环形放电喷嘴
FR3000414B1 (fr) * 2012-12-28 2015-07-10 Centre Nat Rech Scient Chargeur d'aerosol concentrique par decharge electrique
CN204848727U (zh) * 2015-07-03 2015-12-09 天津恒圣迦南建筑材料有限公司 一种导静电粉末涂料制备装置
CN205731702U (zh) * 2016-05-12 2016-11-30 广东正英科技有限公司 一种机械臂用粉末静电喷枪
CN106259274A (zh) * 2016-10-13 2017-01-04 广西大学 一种粉末喷洒机

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Publication number Publication date
WO2018176164A1 (fr) 2018-10-04
ES2828068T3 (es) 2021-05-25
EP3551336A1 (fr) 2019-10-16
PT3551336T (pt) 2020-12-11
TWI749148B (zh) 2021-12-11
CN110325285B (zh) 2021-07-09
TW201838719A (zh) 2018-11-01
CN110325285A (zh) 2019-10-11
CH713662A2 (de) 2018-10-15
US20200360942A1 (en) 2020-11-19

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