JP2015097983A - External charging type electrostatic coating hand gun machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an external charging electrostatic coating hand gun machine that can suppress a deposition of paint onto a high voltage-impressed part, can remove even water content due to dew condensation or the like onto the high voltage-impressed part, and can avoid a leak current by high voltage at the high voltage-impressed part.SOLUTION: An external charging electrostatic coating hand gun machine of this invention comprises: a coating machine body; an air cap provided around a paint outlet of the coating machine body and having a pattern forming air holes that form a spray pattern in an inner wall surface facing paint blown out of the paint outlet; a high voltage-impressed part arranged by being extended over the air cap from the coating machine body in a blowout direction of the paint; and an air spray structure that sprays air to the high voltage-impressed part.

Description

  The present invention relates to a hand gun type external charging electrostatic coating machine.

  As a hand gun type externally charged electrostatic coating machine, for example, the one shown in the following Patent Document 1 is known.

  In Patent Document 1, the paint from the coating machine main body is mixed and atomized with an air flow and sprayed, and the high voltage application unit extending from the coating machine body to the vicinity of the paint outlet is used to increase the amount of paint sprayed. An electrostatic coating machine in which particles are charged by voltage is disclosed. Such an electrostatic coating machine improves the coating efficiency by an electric field formed between the electrostatic coating machine and the object to be coated.

  However, paint sprayed from the main body of the coating machine is likely to adhere to the high voltage application unit, and condensation is likely to occur. For this reason, there is a disadvantage that high voltage leakage occurs in the high voltage application section.

JP 2008-119557 A

  The present invention has been made in view of such circumstances, and an object thereof is to suppress the adhesion of the paint to the high voltage application unit, and to cause moisture or the like due to condensation to adhere to the high voltage application unit. Another object of the present invention is to provide a hand gun type externally charged electrostatic coating machine that can remove the moisture and avoid high voltage leakage in the high voltage application unit.

In order to achieve the above object, the present invention is grasped by the following configuration.
(1) A hand gun type externally charged electrostatic coating machine according to the present invention is provided around a coating machine main body and a paint outlet part of the coating machine body, and faces the paint blown out from the paint outlet part. An air cap having a pattern-forming air hole for forming a spray pattern on the inner wall surface, a high voltage applying unit disposed on the air cap from the coating machine main body so as to extend in the blowing direction of the paint, and An air blowing structure for blowing air to the high voltage application unit.

(2) In the configuration of (1) above, the air blowing structure is provided in the air cap.

(3) In the configuration of (2), the air blowing structure is branched from an air blowing hole provided in the air cap and an air flow path for guiding air to the pattern forming air hole, and the air blowing hole And a branch channel for guiding air to the air.

(4) In the configuration of (3) above, the air blowing hole is formed at a corner (one) provided in the air cap.

(5) In the configuration of (4), the corner (one) portion is formed to extend in a direction orthogonal to the paint blowing direction.

(6) In the configuration of (4) or (5), the air blowing hole is formed in a direction in which the paint is blown out.

(7) In the configuration of (4) or (5), the air blowing hole is formed toward the high voltage application unit.

(8) In the configuration of (4) or (5), the air blowing hole formed toward the blowing direction of the paint and the air blowing hole formed toward the high voltage applying unit are provided. Yes.

(9) In the configuration of (8), the diameter of the air blowing hole formed toward the blowing direction of the paint is larger than the diameter of the air blowing hole formed toward the high voltage application unit.

(10) In the configuration of (3), the air cap includes a pair of pattern forming air holes and a pair of air blowing holes, and the air blowing holes are provided with the pattern forming air holes. It is provided on the outer wall surface opposite to the inner wall surface.

(11) In the configuration of the above (3) or (4), the air blowing hole, the pattern forming air hole, and the high voltage applying unit are arranged on a substantially straight line in a front view when viewing the paint blowing port. Has been.

  According to the present invention, it is possible to suppress the adhesion of the paint to the high voltage application portion, and even if moisture or the like due to condensation adheres to the high voltage application portion, the moisture etc. can be removed. It is possible to provide a hand gun type externally charged electrostatic coating machine capable of avoiding a high voltage leak in the section.

It is a perspective view which shows the external appearance of Embodiment 1 of the external charging electrostatic coating machine of this invention. It is an enlarged view of the front-end | tip part of the barrel part of an external charging type electrostatic coating machine. It is sectional drawing in the III-III line of FIG. FIG. 2 is a partial cross-sectional view of a distal end portion of a barrel portion of an externally charged electrostatic coating machine viewed from an arrow direction α in FIG. 1. It is the figure drawn corresponding to FIG. 4, and is a figure which shows the axial direction of the air blowing hole formed in the air cap. It is a figure which shows the structure of Embodiment 2 of the external charging type electrostatic coating machine of this invention. It is a figure which shows the structure of Embodiment 3 of the external charging type electrostatic coating machine of this invention. It is a figure which shows the structure of Embodiment 4 of the external charging electrostatic coating machine of this invention. It is a figure which shows the structure of Embodiment 5 of the external charging electrostatic coating machine of this invention. It is a figure which shows the structure of Embodiment 6 of the external charging electrostatic coating machine of this invention. It is a figure which shows the modification of Embodiment 6 of the external charging electrostatic coating machine of this invention. It is a figure which shows the structure of Embodiment 7 of the external charging electrostatic coating machine of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings. Note that the same number is assigned to the same element throughout the description of the embodiment.

(Embodiment 1)
FIG. 1 is a perspective view showing the external appearance of an externally charged electrostatic coating machine of the present invention. As shown in FIG. 1, the externally charged electrostatic coating machine 10 is a so-called hand gun type. That is, the coating machine main body 20 has a gripping portion 30, and grips the gripping portion 30 and sprays from the tip of the barrel portion 21 (indicated by symbol A in the drawing) of the coating machine main body 20 by operating the trigger 40. The sprayed paint is ejected.

  The tip of the barrel 21 has a paint outlet 22 (see FIG. 2) for ejecting paint at the center thereof, and an air cap 23 is disposed around the periphery. An annular slit 24 (see FIG. 2) is formed between the paint outlet 22 and the air cap 23. From the slit 24, an air flow path 60 (see FIG. 3) provided in the coating machine body 20 is formed. The air is now ejected. The air from the slit 24 is mixed with the paint from the paint blowout port 22 to atomize the paint.

  In addition, the air cap 23 has a pair of corner portions 25 that are opposed to each other with the paint outlet portion 22 therebetween, and the inner wall surface of the corner portion 25 that faces the paint to be blown out. The pattern forming air holes 26 are respectively formed. These pattern forming air holes 26 are formed by spraying air from an air flow path 60 (see FIG. 3) provided in the coating machine main body 20 to change the spray pattern of the paint from the paint outlet 22, for example, in cross section. In view, it is formed in an elliptical shape.

  As shown in FIG. 2 which is an enlarged view of the distal end portion of the barrel portion 21, the air cap 23 has its corner portions 25 in the horizontal direction, that is, in the longitudinal directions of the barrel portion 21 and the grip portion 30. It is attached to the barrel part 21 so as to be arranged in parallel in the orthogonal direction. 2 is a perspective view viewed from the opposite direction to FIG.

  As shown in FIG. 2, the air cap 23 is fixed to the barrel portion 21 by an air cap cover 27 that is screwed around the distal end portion of the barrel portion 21.

  Further, a high voltage application unit 50 is attached to the barrel portion 21 (the coating machine body 20), and the high voltage application unit 50 blows paint from the coating machine body 20 onto the air cap 23 (straddling the air cap 23). It extends in the direction and is arranged. More specifically, as shown in FIG. 2, the high voltage applying unit 50 is positioned adjacent to one corner 25 of the air cap 23, and the paint outlet 22 is viewed from the front. When viewed from the front, the high voltage application section 50 and each corner section 25 are arranged on the same horizontal line. The high voltage application unit 50 charges the paint particles with a high voltage, and improves the coating efficiency by an electric field formed between the electrostatic coating machine 10 and an object to be coated (not shown).

  FIG. 3 shows a cross-sectional view taken along line III-III in FIG. As shown in FIG. 3, an air flow path 60 that guides air supplied from the bottom surface is formed in the grip portion 30 of the electrostatic coating machine 10. The air flow path 60 is connected to a slit 24 between the paint outlet 22 and the air cap 23 shown in FIG. 2 and a pattern forming air hole 26 formed in the air cap 23. Further, as shown in FIG. 3, the barrel part 21 is supplied with a paint through a paint supply port 31, and the paint supplied to the barrel part 21 has a paint outlet part 22. It is guided to the paint nozzle 22 '.

  In the paint nozzle 22 ′, a needle 28 that closes the opening (paint outlet 22) at the tip of the paint nozzle 22 ′ is normally arranged in the paint nozzle 22 ′, and this needle 28 is operated by operating the trigger 40 to the front side. The tip of the paint nozzle 22 'moves in the opening direction. In addition, the operation of the trigger 40 at this time prevents air from being supplied from the gripping portion 30 to the slit 24 between the air cap 23 and the paint blowout port 22 and the pattern formation air hole 26. The valve 29 is opened.

  As shown in FIG. 3, the barrel portion 21 includes a high voltage generator 51, and the high voltage from the high voltage generator 51 is supplied to the high voltage application portion 50. A voltage is applied to the high voltage generator 51 via a connector 32 attached to the bottom surface of the grip portion 30. The barrel portion 21 containing the high voltage generator 51 is made of an insulating material made of resin, for example, and the grip portion 30 is made of semiconductive resin, for example. The grip portion 30 is electrically connected to a needle 28 made of metal, and when an operator operates the hand by hand, the paint is grounded through the grip portion 30 and the needle 28.

  4 is a partial cross-sectional view of the distal end portion of the barrel portion 21 as viewed from the direction of arrow α in FIG. The high voltage application section 50 is formed by a rod-shaped electrode 52 that is electrically connected to a high voltage generator 51 (see FIG. 3), and an insulator 53 made of a resin containing the electrode 52. The tip 52A of the electrode 52 is exposed from the insulator 53 in the direction of the paint ejected from the paint outlet part 22.

  As shown in FIG. 4, among the corners 25 of the air cap 23, the corners 25 (shown by reference numeral 25 </ b> A) on the high voltage application unit 50 side. Air blowing holes 70 are formed on the opposing surfaces (see FIG. 2). More specifically, the air blowing hole 70 is provided on the outer wall surface on the opposite side to the inner wall surface facing the paint blown out from the paint blowing port portion 22 provided with the pattern forming air holes 26. When viewed in the direction in which the paint blows out, it is provided so as to be located closer to the barrel portion 21 (the coating machine body 20) than the pattern forming air holes 26. The air blowing hole 70 is connected to a branch flow path of the air flow path 60 that guides air to the pattern forming air hole 26, and functions as an air blowing structure that blows air onto the surface of the high voltage application unit 50. .

  Although depending on the amount of air being supplied, if the air blowing hole 70 is too large, the amount of air supplied to the pattern forming air hole 26 may be insufficient. Since the amount of air blown onto the surface of the portion 50 may be insufficient, the diameter of the air blowing hole 70 is preferably formed within a range of, for example, 0.3 mm or more and 1.0 mm or less.

Further, as shown in FIG. 5, the air blowing direction of the air blowing hole 70 is in the range of θ1 (= 40 °) or more and θ2 (= 90 °) or less clockwise with respect to the axial direction O of the barrel part 21. By setting so as to be inside, air can be blown onto the surface of the high voltage application unit 50 over almost the entire region in the longitudinal direction of the high voltage application unit 50.
Specifically, it is formed so that the branch channel having an angle selected from the range of the angle θ1 or more and θ2 or less as described above penetrates from the outer wall surface of the air cap 23 provided with the air blowing hole 70 to the air channel 60. do it.

  The air blown in this way flows along the longitudinal direction of the surface of the high voltage application unit 50 as indicated by an arrow P shown in FIG. 4 due to the so-called Coanda effect. As a result, the paint can be prevented from adhering to the surface of the high voltage application unit 50, and even if moisture adheres to the surface of the high voltage application unit 50 due to condensation or the like, It can be removed by blowing away and drying. Accordingly, it is possible to avoid high voltage leakage in the high voltage application unit due to the paint adhering to the surface of the high voltage application unit 50 or moisture adhering due to condensation or the like.

(Embodiment 2)
In the first embodiment, the air blowing holes 70 formed in the corner portions 25 of the air cap 23 are formed in the corner portions 25 </ b> A adjacent to the high voltage application portion 50 among the corner portions 25. I was trying to form. However, the present invention is not limited to this, and as shown in FIG. 6, the air outlet hole 70 may be similarly formed in the other corner portion (indicated by reference numeral 25 </ b> B). That is, in a front view of the paint blowout port 22, the pair of pattern forming air holes 26, the pair of air blowout holes 70, and the high voltage application unit 50 are arranged on a substantially straight line with the paint blowout port 22 as the center. It has become.

  If the air blowing holes 70 are formed in both of the pair of corner portions 25 as in the second embodiment, when the air cap 23 is attached to the barrel portion 21, the pair of corner portions (one). Regardless of which part 25 is disposed adjacent to the high voltage application unit 50, air can be blown onto the high voltage application unit 50. For this reason, the air cap 23 can be normally attached to the barrel portion 21 without checking the corner (25A or 25B) where the air blowing hole 70 is formed. The installation work of 23 improves. In addition, when the air supplied to the air blowing holes 70 is branched and supplied from the air flow path 60 that supplies air to the pattern forming air holes 26, the air blowing holes 70 are evenly provided to form the pattern. The effect that the amount of air supplied to the air hole 26 is easily stabilized can also be expected.

(Embodiment 3)
In the first embodiment, one air blowing hole 70 formed in the corner part 25 of the air cap 23 is formed for one corner part 25. However, the present invention is not limited to this, and a plurality (three in the figure) may be provided as shown in FIG.

  The dotted line O ′ shown in FIG. 7 is a straight line in the paint blowing direction and intersects perpendicularly to a straight line connecting the centers of the pattern formation air holes 26 of the pair of corner portions 25. Is. When a plurality of air blowing holes 70 are provided, as shown in FIG. 7, about three times the diameter D of the pattern forming air holes 26 on both sides (vertical direction in FIG. 7) with respect to the dotted line O ′. It is desirable to provide within the range of the region T having a width of the distance 3D.

  As shown in FIG. 7, the pattern forming air holes 26 and the high voltage applying unit 50 are generally arranged in a substantially straight line. Therefore, although it is desirable for the air blowing holes 70 to be provided on the dotted line O ′ in order to blow air to the high voltage applying unit 50, a plurality of air blowing holes 70 are arranged in the circumferential direction on the basis of the dotted line O ′. In this case, since the positional relationship between the pattern forming air holes 26 and the high voltage application unit 50 is slightly deviated, the air blowing holes 70 for blowing air to the high voltage application unit 50 exist. In addition, air can be blown to the high voltage application unit 50.

  On the other hand, as described above, the pattern formation air holes 26 and the high voltage application unit 50 are arranged in a substantially straight line from the relationship such as the spray state of the paint during use. The air cap 23 is not attached so as to greatly deviate from the basic arrangement. For this reason, the air blown from the air blowing hole 70 provided far away from the dotted line O ′ blows air to a position away from the high voltage application unit 50, and blows air to the high voltage application unit 50. It becomes the useless air blowing hole 70 which does not contribute. Therefore, when a plurality of air blowing holes 70 are provided, as shown in FIG. 7, the distance is about three times the diameter D of the pattern forming air holes 26 on both sides (vertical direction in FIG. 7) with respect to the dotted line O ′. It is appropriate to provide within the range of the region T having a width corresponding to 3D.

  In FIG. 7, only the outer periphery on one side of the pair of corners (one) 25 is shown, but the outer periphery of the other corner (portion) 25 is also similar to the region T described above. Of course, a plurality of air blowing holes 70 may be provided within the range.

(Embodiment 4)
In the first embodiment, as shown in FIG. 4, the insulator 53 of the high voltage application unit 50 is formed so as to cover the rod-shaped electrode 52, and thus the surface thereof has a smooth shape. However, the present invention is not limited to this, and as shown in FIG. 8, the high voltage application unit 50 on the surface of the high voltage application unit 50 on the side where the paint is blown out from the paint outlet 22 (see FIG. 4). The groove 55 may be formed along the longitudinal direction. The number of the grooves 55 may be one, and as shown in FIG. 8, there are a plurality of (three in the figure) grooves 55 arranged in parallel in the width (short side) direction of the high voltage application unit 50. Alternatively, the groove 55 may be provided on the entire circumference of the high voltage application unit 50 in the circumferential direction.

  In this case, air from the air blowing hole 70 (see FIG. 4) of the air cap 23 is guided by the groove 55. Therefore, the air blown to the high voltage application unit 50 efficiently flows along the surface of the high voltage application unit 50 in the longitudinal direction, so that it is possible to prevent adhesion of paint and remove moisture such as condensation. Can be further improved.

(Embodiment 5)
FIG. 9 is a block diagram showing Embodiment 5 of the externally charged electrostatic coating machine of the present invention. 9A is a diagram drawn in association with FIG. 2, and FIG. 9B is a cross-sectional view taken along the line bb of FIG. 9A.
In FIG. 9A, the configuration different from that in FIG. 2 is that the corner portions 25 formed on the air cap 23 are first formed to extend in a direction perpendicular to the paint blowing direction. There is to be. In other words, one corner (one) portion 25 is extended so as to be close to the high voltage applying portion 50 at the tip thereof, and the other corner (one) portion 25 is disposed with the paint blowout port portion 22 therebetween. It is formed symmetrically with one corner portion 25. Further, as shown in FIG. 9B, the air blowing hole 70 formed in each corner portion 25 is formed in the tip portion of the corner portion 25 toward the paint blowing direction. Yes.

  According to the externally charged electrostatic coating machine configured as described above, the air blowing hole 70 is close to the high voltage applying unit 50 so that air is blown out along the longitudinal direction of the high voltage applying unit 50. As a result, it is possible to further improve the effects of preventing adhesion of the paint, removing water generated by condensation, and preventing the occurrence of condensation itself.

(Embodiment 6)
FIG. 10 is a block diagram showing Embodiment 6 of the externally charged electrostatic coating machine of the present invention, and is a diagram drawn in association with FIG. 9B. In FIG. 10, the configuration different from that in the case of FIG. 9B is that the air blowing hole 70 formed toward the high voltage applying unit 50 together with the air blowing hole 70 formed toward the paint blowing direction. 'To be equipped with. The air blowing hole 70 ′ is continuous with the air flow path branched from the air flow path continuous with the air blowing hole 70. The air blowing hole 70 ′ thus provided can discharge air to a portion other than the portion where the air is blown only by the air blowing hole 70 of the high voltage applying unit 50, that is, to the base of the high voltage applying unit. become.

  In FIG. 10, the air blowing hole 70 ′ is formed along the extending direction of the corner portion 25, but as shown in FIG. 11, the air blowing hole 70 ′ is directed toward the base side of the high voltage applying portion 50. Of course, it may be formed to be inclined. In this case, in the vicinity of the base of the high voltage application unit 50, it is possible to prevent adhesion of paint, to remove moisture generated by condensation, and to prevent the occurrence of condensation itself.

(Embodiment 7)
FIG. 12 is a block diagram showing Embodiment 7 of the externally charged electrostatic coating machine of the present invention, and is an enlarged view drawn in association with FIG. As shown in FIG. 12, the diameter D of the air blowing hole 70 is formed larger than the diameter d of the air blowing hole 70 ′.

  In such a case, the amount of air blown from the air blowing hole 70 and the air blowing hole 70 ′ is equivalent or the effect that the amount of air from the air blowing hole 70 can be increased is achieved. If the diameter D of the air blowing hole 70 and the diameter d of the air blowing hole 70 ′ are the same, the amount of air from the air blowing hole 70 ′ increases due to the structure, and the front end side of the high voltage application unit 50. In this case, it becomes impossible to sufficiently remove moisture such as prevention of adhesion of paint and condensation.

  It goes without saying that such a configuration may be applied to the air blowing hole 70 and the air blowing hole 70 ′ shown in FIGS. 10 and 11.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiments. Further, it is apparent from the description of the scope of claims that embodiments with such changes or improvements can also be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Electrostatic coating machine 20 Coating machine main body 21 Gun barrel part 22 Paint outlet part 22 'Paint nozzle 23 Air cap 24 Slit 25 Corner part 26 Pattern formation air hole 27 Air cap cover 28 Needle 29 Air valve 30 Gripping part 31 Paint Supply Port 32 Connector 40 Trigger 50 High Voltage Application Unit 51 High Voltage Generator 52 Electrode 53 Insulator 55 Groove 60 Air Flow Path 70 Air Blowout Hole

Claims (11)

It is a hand gun type externally charged electrostatic coating machine,
The main body of the coating machine,
An air cap having a pattern forming air hole that is provided around the paint outlet of the coating machine body and forms a spray pattern on an inner wall surface facing the paint blown out from the paint outlet;
A high voltage application unit arranged to extend from the coating machine main body on the air cap in the direction of blowing the paint;
An externally charged electrostatic coating machine comprising: an air spray structure for spraying air on the high voltage application unit.   The externally charged electrostatic coating machine according to claim 1, wherein the air spray structure is provided on the air cap.   The air blowing structure includes an air blowing hole provided in the air cap, and a branching channel that branches from an air flow path that guides air to the pattern forming air hole and guides air to the air blowing hole. The externally charged electrostatic coating machine according to claim 2.   The externally charged electrostatic coating machine according to claim 3, wherein the air blowing hole is formed in a corner portion provided in the air cap.   5. The externally charged electrostatic coating machine according to claim 4, wherein the corner portion is formed so as to extend in a direction perpendicular to a direction in which the paint is blown out.   The externally charged electrostatic coating machine according to claim 4 or 5, wherein the air blowing holes are formed in a direction in which the paint is blown out.   The externally charged electrostatic coating machine according to claim 4 or 5, wherein the air blowing hole is formed toward the high voltage application unit.   The outside according to claim 4 or 5, wherein the air blowing hole formed toward the blowing direction of the paint and the air blowing hole formed toward the high voltage application unit are provided. Electrostatic electrostatic coating machine.   The outside according to claim 8, wherein a diameter of the air blowing hole formed toward the blowing direction of the paint is larger than a diameter of the air blowing hole formed toward the high voltage application unit. Electrostatic electrostatic coating machine. The air cap includes a pair of pattern forming air holes and a pair of air blowing holes,
4. The externally charged electrostatic coating machine according to claim 3, wherein the air blowing holes are provided on an outer wall surface opposite to the inner wall surface on which the pattern forming air holes are provided.   The said air blowing hole, the said pattern formation air hole, and the said high voltage application part are arrange | positioned on the substantially straight line in the front view which looks at the said paint blower outlet part, The Claim 3 or 4 characterized by the above-mentioned. Externally charged electrostatic coating machine.

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