WO2009069396A1 - 静電塗装装置 - Google Patents
静電塗装装置 Download PDFInfo
- Publication number
- WO2009069396A1 WO2009069396A1 PCT/JP2008/068808 JP2008068808W WO2009069396A1 WO 2009069396 A1 WO2009069396 A1 WO 2009069396A1 JP 2008068808 W JP2008068808 W JP 2008068808W WO 2009069396 A1 WO2009069396 A1 WO 2009069396A1
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- WO
- WIPO (PCT)
- Prior art keywords
- electrode
- external electrode
- high voltage
- atomizing head
- rotary atomizing
- Prior art date
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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
- B05B5/053—Arrangements for supplying power, e.g. charging power
- B05B5/0533—Electrodes specially adapted therefor; Arrangements of electrodes
- B05B5/0535—Electrodes specially adapted therefor; Arrangements of electrodes at least two electrodes having different potentials being held on the discharge apparatus, one of them being a charging electrode of the corona type located in the spray or close to it, and another being of the non-corona type located outside of the path for the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- 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
- B05B5/025—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 second high-voltage applying means has a pulse width of the pulse-like voltage, and an electron avalanche.
- the 2nd voltage applying means applies a pulse-like electric voltage whose voltage changes intermittently to the second external electrode, if there are multiple needle-like electrodes, a single needle-like shape is required for pressure generation.
- the corona discharge does not concentrate on the electrodes, and the corner discharge can be generated evenly on all the needle electrodes.
- corner discharge can be generated evenly over the entire circumference of the ring-shaped electrode, and the second high voltage applying means applies a pulse voltage whose voltage changes intermittently to the second voltage. Since it is applied to the external electrode, the corner discharge does not concentrate on a part of the ring-shaped electrode, and the corner discharge can be generated evenly around the entire circumference of the ring-shaped electrode.
- the ring-shaped electrode is made of a semiconductive material or an insulating film on the surface of the conductive material. It is formed using what is provided
- the first external electrode is formed by using a needle-like electrode that is disposed at a position farther from the rotary atomizing head than the second external electrode. ing.
- the first outer electrode [the first U electrode is surrounded by the outer peripheral side of the nosing member, and is located farther from the rotary atomizing head than the second outer electrode. It is formed using the arranged ring-shaped electrodes.
- corona discharge is generated all around the ring-shaped electrode forming the first external electrode. For this reason, a sufficient amount of discharge current can be supplied to the housing member, and the high voltage electricity 1li on the outer surface of the eight-membering member can be stably maintained.
- corona discharge by ring-shaped electrodes By this, it is possible to recharge the paint particles whose charge amount is attenuated.
- the first external electrode is disposed at a position farther from the rotary atomizing head than the second external electrode so as to surround the outer peripheral side of the eight cushioning member,
- the tip is formed by using a blade-shaped electrode whose tip is pointed like a thin blade over the entire circumference and becomes a penetrating part.
- the electric field can be concentrated on the edge portion of the blade-like electrode forming the first external electrode, and corona discharge can be generated around the entire circumference of the blade-like electrode. .
- the blur electrode has a blur compared to the field ⁇ that is partially corona-discharged.
- the edge portion of the pre-form electrode is cut out at a plurality of locations on the entire circumference of the pre-form electrode.
- the blade-shaped electrode It is possible to concentrate the electric field at both ends of the notch in the circumferential direction of the notch. As a result, it is possible to easily cause discharge at both circumferential m portions of the notch, and to promote Rona discharge of the braided electrode.
- the first external electrode surrounds the outer peripheral side of the housing member and is arranged at a position farther from the rotary atomizing head than the second external electrode. It is formed using a spiral electrode made of a wire wound in a shape.
- the overall length of the wire can be increased while the outer shape of the spiral electrode forming the first external electrode is reduced.
- the electric field concentration can be increased in the entire spiral electrode, and corona discharge can be performed continuously. For this reason, corona discharge can be generated in the entire spiral electrode having a long overall length, so that a sufficient amount of discharge ions can be supplied to the eight-membering member by increasing the amount of discharge ions.
- the spiral electrode can be reduced in size as compared with the case where the corona discharge is partially performed in the spiral electrode. As a result, it is possible to prevent a spark discharge between the spiral electrode and the object to be coated, and even when painting in a narrow space, it is possible to secure a sufficient distance between the electrode and the object to be coated.
- the movable range of paint spraying means can be expanded to improve operability.
- the first high voltage applying means generates a pulse voltage whose voltage changes intermittently, and the first high voltage consisting of the pulse voltage is applied to the first high voltage. It is configured to apply to an external electrode.
- the first high voltage applying means applies a pulse voltage whose voltage changes intermittently as the first negative voltage to the first external electrode. Compared with this, it is possible to increase the voltage applied to the first external electrode. Therefore, more ⁇ discharge ions can be supplied to the outer surface of the Uzing member, and the floating coating can be supplied. More charge can be recharged on the particles.
- Fig. 2 is a front view showing the rotary atomizing head type coating device in Fig. 1 with the spray circumference broken.
- FIG. 4 is a block diagram showing a circuit configuration of the rotary atomizing head type coating apparatus according to the first embodiment.
- FIG. 5 is a characteristic diagram showing the time change of the first and second high voltages applied to the first and second external electrodes.
- FIG. 7 is a front view showing a rotary atomizing head type coating apparatus according to the second embodiment.
- FIG. 8 is a left side view of FIG. 7 showing a rotary atomizing head type coating device according to the second embodiment.
- FIG. 9 is a block diagram showing a circuit configuration of the rotary atomizing head type coating apparatus according to the second embodiment.
- FIG. 10 is a cross-sectional view showing an enlarged ring-shaped electrode used for the second embodiment at the position a in FIG.
- FIG. 11 is a cross-sectional view at the same position as FIG. 10 showing a ring-shaped electrode according to a modification.
- FIG. 13 is a block diagram showing the overall configuration of a rotary atomizing head type coating apparatus according to the fourth embodiment.
- Figure 14 shows the first and second applied to the first and second external electrodes.
- FIG. 2 is a characteristic diagram showing the time variation of high voltage 2.
- FIG. 15 is a front view similar to FIG. 2 showing the rotary atomizing head-type paint parent according to the fifth embodiment in a state where the periphery of the sprayer is broken.
- FIG. 16 is a front view showing a rotary atomizing head type coating apparatus according to a sixth embodiment.
- Figure 17 is a perspective view showing the blade electrode in Figure 16 alone.
- FIG. 18 is a front view showing a rotary atomizing head type coating apparatus according to the seventh embodiment. rui / ur icuuo / uooo ⁇ o Fig. 19 shows an oblique view of the blade electrode in Fig. 18
- FIG. 1 A first figure.
- Figure 20 shows a rotary atomizing head type coating according to the eighth embodiment.
- Figure 21 is a perspective view showing the spiral electrode in Figure 20 alone.
- Atomizing head type coating equipment static ⁇ coating
- FIG. 1 to FIG. 6 show a first embodiment of an electrostatic coating apparatus according to the present invention.
- reference numeral 1 denotes a rotary atomizing head type coating device according to the first embodiment.
- the coating device 1 includes a sprayer 2, an octave member 6, first and second external electrodes 8 10, which will be described later.
- the first and second high voltage generators 1 1 and 1 2 are used.
- the spray 2 is a sprayer as a paint spraying means for spraying the paint toward the object A to be coated at the base potential.
- the spray 2 is composed of an air motor 3 described later, a rotary atomizing head 4 and the like. Has been
- Reference numeral 3 is an electromotor made of a conductive metal material.
- ⁇ Evening 3 is shown in Fig. 2. As shown in Fig. 2, the hollow rotation supported by the motor 3 k and the motor nosing 3 A through the hydrostatic bearing 3 B is rotatably supported. Axis 3 C and rotation axis 3
- Air evening bin 3 D fixed to the base end side of C and Air evening 3 is the air evening bin
- the rotary shaft 3 C and the rotary atomizing head 4 are rotated at a high speed, for example, from 3 00 to 100 rpm.
- the structure is a first
- the six needle electrodes 8 ⁇ are coaxial with the rotary atomizing head 4
- the diameter dimension is large around the rotation axis 3C
- the six needle-shaped electrodes 8 mm are all the distances from the rotary atomizing head 4
- the external electrode 8 is connected with the needle electrode 8B.
- the second external electrode 10 is a housing member 6.
- 6 pieces are provided at regular intervals in the circumferential direction.
- the external electrode 10 includes an electrode support portion 1 OA extending in a short bar shape from the housing member 6 toward the front side, and a needle-like electrode 10 B provided at the tip of the electrode support portion 10 A. It is configured.
- the electrode support portion 1 O A is formed by using, for example, the same insulating resin material as that of the housing member 6, and the tip thereof is disposed on the outer peripheral side of the rotary atomizing head 4.
- the needle electrode 10 B is formed in a needle shape with a free end using a conductive material such as metal, for example, and generates a second high voltage described later via a resistor 10 C. Connected to device 1 2.
- the resistance 10 C suppresses the electric charge stored on the second high voltage generator 12 2 side from being discharged at once even if the needle electrode 10 B is short-circuited with the workpiece A. It is a thing. Then, the second high voltage V 2 from the high voltage generator 12 is applied to the needle electrode 10 B.
- the acicular electrode 10 B of the external electrode 10 is a rotary atomizing head.
- the six needle electrodes 10 B are provided at positions along a small-diameter circle having a diameter smaller than the large-diameter circle of the needle-like electrode 8 B around the rotation axis 3 C.
- the six acicular electrodes 10 B are closer to the rotary atomizing head 4 than the acicular electrodes 8 B of the first outer electrode 8 in the axial direction ( ⁇ , rearward direction) Located on the front side
- the six needle-like electrodes 10 B all have the same distance from the rotary atomizing head 4 and the first external electrode.
- each needle electrode 10 B is arranged at a position close to the rotary atomizing head 4, it discharges over the entire circumference (360 degrees) of the discharge edge 4 A of the rotary atomizing head 4.
- the applied paint particles can be charged with a high voltage sufficiently or evenly.
- the needle electrode 10 B of the external electrode 10 is arranged so as to surround the periphery of the shaping ring U 7.
- the external electrode 10 supplies coronons to the outer surface of the shaping air ring 7 to charge the sheave air U ring 7.
- Reference numeral 1 denotes a first high voltage generator as a first high voltage applicator connected to the first external electrode 8, and the high voltage generator 1 1 includes a plurality of cooperators as shown in FIG. Multi-stage rectifier circuit consisting of capacitors and diodes (both not shown) 1 1
- the multi-stage rectifier circuit 11 A which is configured using A (a so-called cock croft circuit), is connected to the acicular electrode 8B of the external electrode 8 via a resistor 11 B. Then, the high voltage generator 11 generates a first high voltage VI consisting of a current voltage of, for example, 60 kV to -100 kV, whereby the high voltage generator 11 is The first high voltage VI is supplied to the acicular pole 8 B of the external electrode 8.
- Reference numeral 2 denotes a second high voltage generator as a second high voltage applying means connected to the second external electrode 10.
- the high voltage generator 2 is connected to the first high voltage generator 1 1 and the second high voltage generator 1 1.
- a multi-stage rectifier circuit 2A is used.
- V 2 is a pulse generator that generates a pulsed voltage V 2 p
- the A pulse generator circuit 1 2 B is connected to the output side of the multistage rectifier circuit 1 2 A via the ⁇ sensor 1 2 C and the resistor 1 2 D, and the consonant answer 1 2008/068808
- the needle electrode 10 0 B of the external electrode 10 is connected.
- the high voltage generator 12 generates a pulsed voltage V 2p whose voltage intermittently changes in a range lower than the first high voltage VI, and a second high voltage consisting of the pulsed voltage V 2p.
- the voltage V 2 is supplied to the needle electrode 10 0 B of the external electrode 10.
- the second high voltage V 2 is, for example, a DC voltage V of ⁇ 10 kV 30 kV as shown in FIGS.
- the pulse amplitude A 2p is set to a value not more than 1.5 times the DC voltage V 2 d, for example, as shown in the following formula 1. This is because the pulse voltage V 2p Needle-like electrodes even when there is a rash at the falling part
- V 2max 1 2 0 k V to 1 7 5 k V
- the pulse width ⁇ 2 (half-value width) of the pulsed voltage V 2p is, as shown in Equation 3 below, a streamer that forms a streamer due to the increase in the avalanche. For example, a value of 0.5 s to 5 s so that it is shorter than the reamer formation time. t RX.
- the specified avalanche is the external electrode 1 due to the high electric field generated around the external electrode 1 0.
- interval S 2 between two adjacent pulse-like voltages V 2p depends on the refresh time as shown in the following equation (4).
- the refresh time is the time until the number of positive ions decreases and a weak and stable corona discharge occurs around the second external electrode 10 (needle electrode 10 B).
- the DC voltage V 2 d is applied to the second external electrode 10 even when the pulse voltage V 2p is not applied. For this reason, even when the pulsed voltage V 2p is not applied, a weak corona discharge is generated in the second external electrode 10. Further, as the interval S 2 between the pulse voltage V 2p becomes longer, the frequency of strong corona discharge of the needle electrode 10 B decreases, and the charging efficiency for the paint particles decreases. For this reason, the interval S 2 (repetition period T 2 of the pulse voltage V 2p) is preferably set as short as possible within a range that is longer than the refresh time.
- the sprayer 2 rotates the rotary atomization 4 at a high speed by the air motor 3, and supplies the paint to the rotary atomization head 4 through the feed tube 5 in this state.
- the jet 2 atomizes the paint by the centrifugal force when the rotary atomizing head 4 rotates, and sprays it as paint particles.
- the shaving air is supplied from the shaping air 7
- Bing air controls the spray pattern consisting of paint particles.
- the acicular electrode 10 0 B of the second external electrode 10 has an intermittent pulse voltage V A second high voltage V 2 of 2 p is applied.
- V A second high voltage V 2 of 2 p is applied.
- the acicular electrode 10 B intermittently generates a strong Rona discharge, and generates an ionization zone around the rotary atomizing head 4 along with the corona discharge.
- the coating particles sprayed from the rotary atomizing head 4 are indirectly charged with a high voltage by passing through the thickening zone. Then, the charged paint particles (charged paint particles) fly along the electrostatic field formed between the needle-like electrode 8 B and the object A and are applied to the object A.
- the second external electrode 10 is arranged closer to the rotary atomizing head 4 than the first external electrode 8, so the second external electrode 10 is a rotary fog. It can be used as a paint particle charging electrode that charges paint particles sprayed from the chemical head 4.
- the second external electrode 10 Since the second external electrode 10 is arranged closer to the rotary atomization port 4 than the first external electrode 8, the second external electrode 10 and the rotary atomization head 4 which is the ground body Therefore, a voltage lower than that of the first external electrode 8 must be applied to the second external electrode 10 so that no spark occurs between the first external electrode 10 and the DC voltage to the second external electrode 10. Is applied, the corona discharge is less likely to occur as much as the voltage is lower, and the charging efficiency for the paint particles tends to decrease.
- the reason why a stronger corona discharge is easily stuck (concentrated) in one place is that the current flows and is ionized by the discharge. This is because the local apparent insulation resistance further decreases. As a result, it becomes easy to progress to a streamer only around one electrode. For this reason, the needle electrode 10 0 B of the second external electrode 10 is placed around the rotary atomizing head 4.
- the second external electrode In contrast, in the first embodiment, the second external electrode
- the first external electrode 8 is arranged at a position farther from the rotary atomizing head 4 than the second external electrode 10, the first external electrode 8 is connected to the second external electrode 10. A higher voltage can be applied. For this reason, the first external electrode 8 can be used as an electric field forming electrode that forms a strong electric field with the object A to be coated. As a result, the paint particles charged by the second external electrode 10 are transformed into the first external electrode.
- the first external electrode 8 is driven by the first high voltage V I
- the first external electrode 8 can recharge the paint particles floating around it by generating a corona discharge, for example, the first external electrode 8 was sprayed from the rotary atomizing head 4. Even when a part of the paint particles is not charged by the second external electrode 10, the paint particles can be recharged by using the first external electrode 8. This It is possible to reduce the paint particles floating around the eight-housing member 6 by losing the charge, and the paint application efficiency can be increased.
- the first external electrode 8 functions to form an electrostatic field with the object A to be coated, and the second external electrode 10 functions to charge the paint particles. For this reason, each of the external electrodes 8 10 can set the voltages V 1 and V 2 with high accuracy for its function, so that the coating efficiency can be improved. It can be reduced.
- the interval S 2 between 2 p is the period from when the number of positive ions decreases until a stable corner discharge without the second external electrode 10 occurs.
- the first pulsed voltage V 2 p is applied to the external electrode 10 in the example, and then positive ions are generated around the second external electrode 10.
- the second pulse voltage When V 2 p is applied this positive ion number decreases.
- the pulse voltage V 2 p is applied to the second external electrode 10
- the insulation pile around the second external electrode 10 can be made high.
- the second external electrode 10 is pulsed. Even if the avalanche increases when the voltage V 2p is applied, the number of positive currents is decreased when the next pulse voltage V 2 p is applied, and the electron around the second external electrode 10 is reduced. It is possible to return to the state before the avalanche increased (the state where the weak corona discharge continued), and the progress of the slimmer can be surely prevented.
- the second external electrode 10 is formed by using the needle electrode 10 B whose tip is located around the rotary atomizing head 4, so that the electric field is concentrated on the tip of the needle electrode 10 B. Corona discharge can be promoted.
- the second high voltage generator 12 2 applies a pulsed voltage V 2 p whose voltage changes intermittently to the second outer electrode 10. Corona discharge may not be concentrated on one needle electrode 10 B with multiple needle electrodes 10 B ⁇ Corona discharge is evenly distributed on all needle electrodes 10 B Can be generated.
- the first external electrode 8 is formed by using the needle-like electrode 8 B, the electric field can be concentrated on the tip of the needle-like 8 B, and the needle-like electrode 8 B and the object A to be coated A A strong electrostatic field can be formed between the two. For this reason, using a strong electrostatic field, the charged paint particles charged by the first and second external parts 8 and 10 can be actively directed to the object A side.
- the present invention is not limited to this, but is formed by using a shipping insulating insulating resin material.
- the bearing may be formed using a conductive metal material.
- corona ions are supplied from the second external electrode 10 to the shaving air ring made of a metal material, so that the entire shaving air ring has the same polarity as the charged paint particles in a substantially uniform state. Charge.
- the shearing air ring functions as a repelling electrode, so that it is possible to prevent the charged paint particles from adhering to the shearing ring.
- FIGS. 7 to 10 show a rotary atomizing head type coating apparatus according to the second embodiment.
- the feature of the second embodiment is that the first and second external electrodes are formed by using ring-shaped electrodes.
- the second embodiment is the same as the first embodiment. Constituent elements will be denoted by the same reference numerals, and description thereof will be omitted.
- the first external electrode 2 2 is a first external electrode provided on the outer peripheral side of the housing member 6, and the first external electrode 2 2 is substantially the same as the first external electrode 8 according to the first embodiment. It is attached to a bowl-shaped support portion 9 arranged on the rear side of the member 6.
- the first external electrode 2 2 is configured by using a ring-shaped electrode 2 2 ⁇ instead of the needle-shaped electrode 8 ⁇ , and therefore the first external electrode 8 according to the first embodiment is used. Is different.
- the three electrode support portions 2 2 A are formed using the same insulating resin material as the ⁇ -cushion member 6 and are arranged at equal intervals in the circumferential direction.
- the ring-shaped electrode 2 2 B is, for example, 100 M ⁇
- It is formed in a circular ring shape using a semiconductive material with a resistance value of about 300 M ⁇ , and is connected to the first negative voltage generator 11 through a resistor 2 2 C.
- the ring-shaped electrode 22 B is formed, for example, by bending an elongated wire made of a semiconductive material into an annular shape.
- Resistor 2 2 C is a ring electrode
- the ring-shaped electrode 22 B is configured to be applied with the first high voltage V I from the high voltage generating inlet 11.
- the ring-shaped electrode 22 B is arranged in an annular shape coaxial with the rotary atomizing head 4, and is provided at a position along a large-diameter circle having a large diameter centered on the rotary shaft 3 C.
- the V-shaped electrode 2 2 B has the same distance dimension with the rotary atomizing head 4 over the entire circumference.
- external electrode 2
- 2 3 is a second external electrode provided on the front side of the eight-cushion member 6, and the second external electrode 2 3 is the first external electrode 2.
- Electrode 2 3 In the same manner as 2, for example, three electrode support portions 23 A that extend in the shape of a short bar from the eight-swing member 6 toward the front side, and a ring shape disposed at the tip of the electrode support portion 23 A Electrode 2 3
- the resistor 23 C has a ring-shaped electrode 23 B and the object A to be coated.
- the ring-shaped electrode 2 3 B of the external electrode 2 3 is arranged in an annular shape with the rotary atomizing head 4 and the shaft of the first external electrode 2 2.
- the ring-shaped electrode 2 3 B is located on the inner peripheral side of the U-shaped electrode 2 2 B and on the front side.
- the ring-shaped electrode 23 B has an axial direction (front and rear).
- Corona discharge can be generated evenly around the entire circumference of 3B.
- the ring-shaped electrode 2 2 B In contrast, in the present embodiment, the ring-shaped electrode 2 2 B,
- the ring-shaped electrodes 2 2 B and 2 3 B are formed using a semiconductive material.
- the present invention is not limited to this.
- an insulating film 25 is provided on the surface of the metal wire 24 made of a conductive material, and the ring electrode 2 3 is provided. B 'may be formed. Even in this case, the insulating coating 25 can prevent the occurrence of sparks.
- Fig. 12 shows a rotary atomizing head type coating apparatus according to a third embodiment.
- the ring-shaped electrode 3 2 B has the same distance from the rotary atomizing head 4 over the entire circumference, and the needle-shaped electrode 8 B of the first external electrode 8 Is also located near the rotary atomizing head 4.
- the external electrode 3 2 mainly charges the paint particles sprayed from the rotary atomizing head 4 with a high voltage by causing corona discharge at the U-shaped electrode 3 2 B.
- pj machines can be obtained even in the third implementation form.
- the first external electrode 8 is formed using the needle-like electrode 8B, for example, compared to the case where the first external electrode 8 is formed using a U-shaped electrode. Concentrate the electric field on the needle-shaped electrode 8 B, and strengthen the force between the needle-shaped electrode 8 B and the workpiece A. P leakage 008/068808
- Paint particles charged by the second external electrode 3 2 are positively directed to the object A using the strong electrostatic field generated by B.
- the feature of the fourth embodiment is that the first high voltage generator supplies the first high voltage consisting of pulses to the first external electrode, and the second high voltage generator is the second high voltage consisting of pulses. Voltage
- 4 1 is the rotary atomizing head type by the form of the 4th implementation
- S 3 ⁇ 4 ⁇ 3 ⁇ 43 ⁇ 4 device 4 1 is spray 2, hung member 6, first and second external electrode 8 10, first and second high-voltage generators, almost the same as coating device 1 according to the first embodiment.
- resistor 4 2 D is the answer 4 2 C and resistor 4
- the high voltage generator 4 2 generates a pulsed voltage V 1 p whose voltage changes intermittently in a range higher than the second high voltage V 2.
- the first high voltage V consisting of this pulsed voltage V 1 p
- the first high voltage VI is, for example, 30 kV to -60.
- DC voltage V ld of k V for example
- the -It is composed of a pulse voltage V lp with a pulse amplitude A lp of 30 kV 90 kV.
- the DC voltage V 1 d is set in a range higher than the second high voltage V 2.
- the pulse amplitude A 1 p is set to a value not more than 1.5 times the DC voltage V Id, for example. Therefore, the peak voltage value V I max (maximum voltage value) of the pulse voltage V lp is, for example, ⁇ 60 kV 1 as shown in the following equation (6).
- the high voltage V 2 is, for example, a DC voltage V 2d of ⁇ 10 kV 30 kV and a pulse amplitude of 10 kV 45 kV, for example. It consists of a pulsed voltage V 2p with A2p.
- the pulse width of the pulsed voltage V 1 p is 1 (half-value width), as shown in the following equation (7): Streamer formation in which a streamer is formed by an increase in the avalanche of electrons It is set to be shorter than time.
- interval S 1 between two adjacent pulsed voltages V 1 p is reduced as the number of positive ions decreases as shown in the following equation (8).
- B) weak stability around It is set to be longer than the refresh time until corona discharge occurs.
- the needle electrode 8 B 1 when the pulse voltage V l p V 2p is applied Compared to the case where V 2 p is applied at a different timing, the needle electrode 8 B 1 when the pulse voltage V l p V 2p is applied
- the potential difference between 0 B can be reduced. Therefore, based on the potential difference between the needle electrodes 8 B 1 0 B, the external electrode 8
- the outer surface 6 of the eight-membering member 6 is applied.
- 5 1 is a rotary atomizing head type coating apparatus according to the fifth embodiment, and the coating apparatus 51 is substantially the same as the coating apparatus 1 according to the first embodiment, the sprayer 2, the housing member 6, The first and second external electrodes 8 and 10 and the first and second high voltage generators 11 and 12 are used. However, it differs from the coating apparatus 1 according to the first embodiment in that the rotating atomizing head 52 of the sprayer 2 is formed using an insulating resin material.
- the rotary atomizing head 52 is rotated at high speed by the air motor 3. In this state, when the paint is supplied to the rotary atomizing head 5 2 through the feed tube 5, the rotary atomizing head 5 2 sprays the paint from the discharge edge 52 A on the front end side by centrifugal force.
- the feature of the sixth embodiment is that the first external electrode is formed by using a blade-like electrode.
- the same components as in the first embodiment are used. Shall be given the same reference numerals and the description thereof shall be omitted.
- 6 1 is a rotary atomizing head type coating device according to the sixth embodiment, and the coating device 6 1 is similar to the coating device 1 according to the first embodiment in the same manner as the sprayer 2, the nozzle, and the udging member 6. , First and second external electrodes 6 2, 10, first and second high voltage generators
- the first external electrode 6 2 is a first external electrode disposed on the outer peripheral side of the housing member 6, and the first external electrode 62 is substantially the same as the first external electrode 8 according to the first embodiment. It is attached to a bowl-shaped support portion 9 disposed on the rear side of the udging member 6.
- the first external electrode 6 2 is configured by using a blade-like electrode 6 3 instead of the needle-like electrode 8 B, so that the first external electrode 8 2 according to the first embodiment is different from the first external electrode 8 B. Are different.
- the external electrode 6 2 includes, for example, three electrode support portions 62 A extending in a long rod shape from the support portion 9 toward the front side, and a brace provided at the tip of the electrode support portion 62 A.
- the three-electrode supporting lifting unit 6 2 A of the present are, for example, eight Ujingu member 6 and
- the blade-like electrode 63 is arranged in an annular shape coaxial with the rotary atomizing head 4, and is provided at a position along a large-diameter circle having a large diameter dimension around the rotary shaft 3C. Further, the blade-like electrode 6 3 is connected to the housing member 6 with a gap (space). TJP2008 / 068808
- the blade electrode 6 3 has the same distance dimension between the rotary atomizing head 4 and the housing member 6 over the entire circumference.
- the blade-like electrode 6 3 is connected to the first high voltage generator 11 through a resistor (not shown). As a result, the first high voltage V I by the high voltage generator 11 is applied to the blade-like electrode 63. For this reason, an electrostatic field is formed between the blade-like electrode 63 and the object A to be grounded.
- Reference numerals 6 4, 6 5, and 6 6 denote edge portions provided at the front ends of the front protruding portion 6 3 A, the rear protruding portion 6 3 B, and the flange portion 6 3 C of the blade-like electrode 6 3, respectively.
- the front edge portion 64 is formed to have a thin blade shape by gradually decreasing the thickness dimension of the front protruding portion 63 A toward the front.
- the rear edge portion 65 is formed in a thin blade shape by gradually reducing the thickness dimension of the rear protrusion portion 63B toward the rear.
- the flange-like edge portion 6 6 is formed in a thin blade shape by gradually reducing the thickness dimension of the flange portion 63 C toward the outer diameter direction.
- the electric field can be concentrated on 6 4, 6 5, 6 6,
- Corona discharge can be generated all around the electrode 6 3. For this reason, a sufficient amount of discharge ions can be supplied to the occluding member 6, and the high voltage potential of the outer surface 6 A of the occupying member 6 can be stably maintained.
- the corona discharge by the wedge portions 6 4, 6 5, and 6 6 of the blade-like electrode 6 3 can recharge the material particles whose electric energy has attenuated.
- the feature of the seventh embodiment is that the first external electrode is formed by using a blade-like electrode, and there are a plurality of blade electrodes around the circumference of the blade-like electrode. This is because a notch is provided in the place.
- the same constituent elements as those in the first embodiment are denoted by the same symbol J, and the description thereof will be omitted.
- the external electrode 7 2 includes, for example, three electrode support portions 7 2 A extending in a long rod shape from the support portion 9 toward the front side, and a blade provided at the tip of the electrode support portion 7 2 A.
- the blade electrode 7 3 is coaxial with the rotary atomizing head 4. 2008/068808
- the blade-like electrode 7 3 is connected to the nosing member 6 and a gap (space).
- the blade-like electrode 73 is formed in a substantially cylindrical shape using a conductive material such as metal or a semi-conductive material, for example, so that the blade-like electrode 73 is protruded to the front side.
- a conductive material such as metal or a semi-conductive material, for example, so that the blade-like electrode 73 is protruded to the front side.
- the braided electrode 7 3 is connected to the first high voltage generator 11 1 via a resistor (not shown), so that the braided electrode 7 3 Generator 1 to 1
- a first high voltage V 1 is applied. For this reason, an electrostatic field is formed between the blade-like electrode 73 and the article A to be grounded.
- 7 4, 7 5, 7 6 are the protrusions on the front side of the blade-like electrode 7 3
- edge part 7 3 A, rear protruding part 7 3 B, and edge part 7 3 C are the edge parts provided at the tip.
- the hook-shaped edge portion 76 is formed with ten sharp edges in a thin blade shape as the thickness dimension of the flange portion 73C gradually decreases in the outer diameter direction.
- the edge portions 7 4, 7 5, 7 6 raise the electric field over the entire circumference of the pre-formed electrode 7 3, so that the edge portions 7 4 7 5 7 6 are, for example, 9 0
- a discharge current of about 20 A 100 A flows and a stable corona discharge is generated.
- each notch 7 7 forms an arc shape and extends along the circumferential direction of the edge portion 7 4, and the notch 7
- the notch 7 7 is formed between two adjacent edge parts 74 (for example, 10 pieces). As a result, the notch 7 7 further concentrates the electric field on the ends 7 4 A on both sides in the circumferential direction of the X wedge portion 7 4 to promote discharge.
- 10 notches 7 8 are formed between two adjacent edge portions 7 5, and are formed at both ends 7 5 in the circumferential direction.
- FIG. 20 and FIG. 21 show a rotary atomizing head type coating apparatus according to an eighth embodiment.
- a feature of the eighth embodiment is that the first external electrode is formed by using a spiral electrode formed of a spirally wound wire.
- the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.
- the external electrode 8 2 is a first external electrode provided on the outer peripheral side of the housing member 6, and the first external electrode 8 2 is substantially the same as the first external electrode 8 according to the first embodiment.
- the first outer electrode 8 2 is attached to a saddle-like support portion 9 disposed on the rear side of the housing member 6 by using a spiral electrode 8 3 instead of the needle electrode 8 B. This is different from the first external electrode 8 according to the first embodiment in the configuration.
- the external electrode 8 2 has, for example, three electrode support portions 8 2 A extending in the form of a long bar from the support portion 9 toward the front side, and contacts the tip of the electrode support portion 8 2 A.
- the first embodiment is the same as the first embodiment.
- the first external electrode 8 2 is a spiral shape in which the arm is turned in the circumferential direction surrounding the knocking member 6.
- the amount of discharge ions can be increased while downsizing the first external electrode 8 2.
- the blade-like electrodes 6 3 and 7 3 have edge portions 6 4, 6 5, 6 6, 7 in a total of 3 directions in both the front and rear directions and the outer diameter direction.
- 4, 7 5 and 7 6 are installed.
- the present invention is not limited to this, and a braided electrode having an edge portion in any one or two of the three directions of the forward direction, the rear direction, and the outer diameter direction may be used.
- the second external electrode 10 is formed using the needle-like electrode 10 B.
- the second embodiment is not limited to the second embodiment.
- the second external electrode may be formed using a ring-shaped electrode.
- the first external electrodes 6 2, 7 2, 8 2 according to the sixth to eighth embodiments may be applied to the rotary atomizing head type coating apparatus 4 1 according to the fourth embodiment.
- the first and second external electrodes 8 and 10 have needle-like electrodes 8 B and 10 B, respectively. It was set as the structure provided individually. However, the present invention is not limited to this.
- the number of needle-like electrodes of the first and second external electrodes may be 5 or less, or 7 or more.
Landscapes
- Electrostatic Spraying Apparatus (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/676,460 US8443754B2 (en) | 2007-11-30 | 2008-10-09 | Electrostatic coating apparatus |
JP2009543716A JP5074520B2 (ja) | 2007-11-30 | 2008-10-09 | 静電塗装装置 |
EP08855398.7A EP2213378B1 (en) | 2007-11-30 | 2008-10-09 | Electrostatic coating device |
CN2008801183708A CN101878070B (zh) | 2007-11-30 | 2008-10-09 | 静电涂装装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007-310644 | 2007-11-30 | ||
JP2007310644 | 2007-11-30 |
Publications (1)
Publication Number | Publication Date |
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WO2009069396A1 true WO2009069396A1 (ja) | 2009-06-04 |
Family
ID=40678299
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2008/068808 WO2009069396A1 (ja) | 2007-11-30 | 2008-10-09 | 静電塗装装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US8443754B2 (ja) |
EP (1) | EP2213378B1 (ja) |
JP (1) | JP5074520B2 (ja) |
KR (1) | KR101120535B1 (ja) |
CN (1) | CN101878070B (ja) |
WO (1) | WO2009069396A1 (ja) |
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JP2011255275A (ja) * | 2010-06-07 | 2011-12-22 | Toyota Motor Corp | 静電塗装装置および静電塗装方法 |
JP2011255278A (ja) * | 2010-06-07 | 2011-12-22 | Toyota Motor Corp | 静電塗装装置および静電塗装方法 |
JP2011255277A (ja) * | 2010-06-07 | 2011-12-22 | Toyota Motor Corp | 静電塗装装置 |
JP2012161755A (ja) * | 2011-02-08 | 2012-08-30 | Asahi Sunac Corp | 静電塗装装置 |
JP2015073948A (ja) * | 2013-10-09 | 2015-04-20 | トヨタ自動車株式会社 | 回転霧化静電塗装装置 |
JP2016534876A (ja) * | 2013-11-12 | 2016-11-10 | サメ テクノロジ | コーティング製品の静電気式の噴霧器及びかかる噴霧器を備える突起物組立体 |
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JP2020089840A (ja) * | 2018-12-06 | 2020-06-11 | 旭サナック株式会社 | 静電塗装用スプレーガン |
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WO2023112319A1 (ja) * | 2021-12-17 | 2023-06-22 | 旭サナック株式会社 | 静電塗装ガン |
Also Published As
Publication number | Publication date |
---|---|
CN101878070A (zh) | 2010-11-03 |
JP5074520B2 (ja) | 2012-11-14 |
EP2213378B1 (en) | 2014-08-20 |
EP2213378A4 (en) | 2012-12-19 |
JPWO2009069396A1 (ja) | 2011-04-07 |
KR20100050482A (ko) | 2010-05-13 |
KR101120535B1 (ko) | 2012-03-07 |
EP2213378A1 (en) | 2010-08-04 |
CN101878070B (zh) | 2012-11-21 |
US20100206225A1 (en) | 2010-08-19 |
US8443754B2 (en) | 2013-05-21 |
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